2016年第12期共收錄54篇
1. Relationships between stable c and n isotope compositions of rice plants, rice yield and quality
Accession number: 20165203163259
Authors: Wang, Zhenchang (1, 2); Guo, Xiangping (1, 2); Huang, Shuangshuang (1, 2); Cao, Xinchun (1, 2); Qiu, Rangjian (3); Liu, Chunwei (3)
Author affiliation: (1) Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China, Ministry of Education, Hohai University, Nanjing; 210098, China; (2) College of Water Conservancy and Hydropower, Hohai University, Nanjing; 210098, China; (3) College of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing; 210044, China
Corresponding author: Guo, Xiangping(xpguo@hhu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 160-171
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To study the relationships between stable C and N isotope compositions, C and N concentration of different organs during different growth stages and rice yield and quality under different irrigation regimes, experiment was conducted in the Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil Water Environment in Southern China, Ministry of Education, Nanjing, China, from May to October in 2013.Five treatments, including alternate flooding and light drought stress during tillering stage (T-LD), alternate flooding and heavy drought stress during tillering stage (T-HD), alternate flooding and light drought stress during jointing stage (J-LD), alternate flooding and heavy drought stress during jointing stage (J-HD) as well as control treatment (CK) with water depth being kept at 5 cm during the whole growth stage, were set up. Results indicated that rice yield had significant postive relationships with δ13C of root, stem and leaves of rice plants during rice ripening stage (P15N of root, stem and leaves during jointing stage as well as ripening stage (P<0.05). The principal component analysis (PCA) was conducted for combination of the selected C and N related parameters, and the retained principal components (PCs) were used in stepwise regression with yield and quality parameters. PCA results showed that a maximum of 90.5% of the total variability in C and N related parameters was explained by the first eight PCs. The stepwise regression analysis indicated that C and N related parameters of different organs during different growth stages could explain 89%, 62%, 80%, 86%, 86% and 68% of total variance in rice grain yield (GY), gross protein content (GPC), brown rice rate(BRR), chalky grain rate (ChGR), chalkiness degree(ChD)and amylose content (AC), respectively. Results indicated that the selected C and N related parameters of different organs during jointing and rice ripening stages could accurately predict yield and quality of rice plant grown under different irrigation regimes.
Number of references: 31
Main heading: Principal component analysis
Controlled terms: Drought - Floods - Grain (agricultural product) - Grain growth - Image quality - Irrigation - Isotopes - Parameter estimation - Plants (botany) - Proteins - Quality control - Regression analysis - Soil moisture
Uncontrolled terms: Different growth stages - Ministry of Education - Principal Components - Rice - Stable isotopes - Stepwise regression analysis - Total variabilities - Yield
Classification code: 444 Water Resources
Water Resources
- 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 804.1 Organic Compounds
Organic Compounds
- 821.3 Agricultural Methods
Agricultural Methods
- 821.4 Agricultural Products
Agricultural Products
- 913.3 Quality Assurance and Control
Quality Assurance and Control
- 922.2 Mathematical Statistics
Mathematical Statistics
- 933.1.2 Crystal Growth
Crystal Growth
Numerical data indexing: Percentage 6.20e+01%, Percentage 6.80e+01%, Percentage 8.00e+01%, Percentage 8.60e+01%, Percentage 8.90e+01%, Percentage 9.05e+01%, Size 5.00e-02m
DOI: 10.6041/j.issn.1000-1298.2016.12.020
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
2. Effects of climatic factors and soil parameters on soil respiration under oxygation conditions
Accession number: 20165203163266
Authors: Zhu, Yan (1); Cai, Huanjie (1, 2); Song, Libing (1, 2); Hou, Huijing (1); Chen, Hui (1, 2)
Author affiliation: (1) Key Laboratory for Agricultural Soil and Water Engineering in Arid Area, Ministry of Education, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling; Shaanxi; 712100, China
Corresponding author: Cai, Huanjie(caihj@nwsuaf.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 223-232
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Oxygation, which can impose aerated water to root zoon through Venturi tube and subsurface drip irrigation (SDI), has been showing yield improvement potentials and great application prospects. The impacts of climatic factors and soil temperature, oxygen concentration and moisture on soil respiration under oxygation and no aerated subsurface drip irrigation conditions were explored. Consequently, two treatments with three replicates were included. Plot experiments were conducted in a greenhouse during tomato growing season under these two different irrigation scenarios. The seasonal variation of soil respiration rate, soil temperature, soil oxygen concentration and soil moisture were described to investigate the relativity between soil respiration rate and these factors. Results showed that with oxygation and CK, soil temperature at the depth of 5 cm (T5) had a high significant positive correlation with soil respiration rate (Rs), and the correlation coefficients were 0.615 and 0.564, respectively. Meanwhile, under the oxygation and CK conditions, T5explained 46.6% and 32.4% variation of Rs, respectively. In addition, air humidity (RH) and soil oxygen concentration (Os) also affected the variation of Rs. RHexplained 35.2% and 23.7% variation of Rsunder the oxygation and CK conditions, respectively. And Osexplained about 20% variation of Rsfor the two treatments. The interaction of these factors affected 76.8% and 42.5% variation of Rswith oxygation and CK, respectively. Therefore, soil temperature was a controlling factor that constrained the soil respiration. Air humidity and soil oxygen concentration also were the important factors affecting the variation of soil respiration. Meanwhile, these factors had an interactive effect on variation of soil respiration rate, and the fitting result under oxygation was more effective. In addition, soil moisture was declined slightly with oxygation. The soil respiration rate and soil oxygen concentration under the oxygation conditions had a significant difference with CK, which were increased by 33.16% and 16.61% compared with CK, respectively. Thus, oxygation could improve soil environment effectively, and then decrease the limiting factors of soil respiration. As a result, under oxygation conditions, soil respiration was more sensitive to the interactions of soil temperature, relative humidity, soil moisture and soil oxygen concentration, and the fitness between these factors and soil respiration was better.
Number of references: 50
Main heading: Soils
Controlled terms: Irrigation - Moisture - Oxygen - Soil moisture - Subirrigation - Temperature - Two phase flow - Water aeration
Uncontrolled terms: Air humidity - Oxygation - Soil oxygen concentration - Soil respiration - Soil temperature
Classification code: 445.1 Water Treatment Techniques
Water Treatment Techniques
- 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 631.1 Fluid Flow, General
Fluid Flow, General
- 641.1 Thermodynamics
Thermodynamics
- 804 Chemical Products Generally
Chemical Products Generally
- 821.3 Agricultural Methods
Agricultural Methods
Numerical data indexing: Percentage 1.66e+01%, Percentage 2.00e+01%, Percentage 2.37e+01%, Percentage 3.24e+01%, Percentage 3.32e+01%, Percentage 3.52e+01%, Percentage 4.25e+01%, Percentage 4.66e+01%, Percentage 7.68e+01%, Size 5.00e-02m
DOI: 10.6041/j.issn.1000-1298.2016.12.027
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
3. Design and experiment of pneumatic disc seed-metering device for mini-tuber
Accession number: 20165203163244
Authors: Lai, Qinghui (1); Ma, Wenpeng (1); Su, Wei (1); Hu, Ziwu (1); Xing, Jinlong (1)
Author affiliation: (1) College of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming; 650500, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 30-37
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to realize the mechanized planting of mini-tuber and solve the problem of large seed filling, a vibrating feeding pneumatic disc seed-metering device for mini-tuber was designed. The seed-metering device was made up of metering plate, air chamber, frame and vibrating seed feeding device. The working principle of the pneumatic disc seed-metering device was expounded. The physical properties of mini-tuber, including geometric dimension, average weight and angle of repose were researched. The structural parameters of metering plate were determined by the theoretical calculation, which contained the metering plate diameter, suction hole diameter and suction hole number. The FLUENT software was used to analyze the internal flow field of air chamber and optimize the location of pressure-outlet. The vibration frequency was calculated and verified by analyzing the movement characteristics of vibration plate. In order to verify the performance of the seed-metering device and find the best parameter combination, the orthogonal test was carried out by using the eligible index, multiple index, missing index as experimental indexes and the operating speed as experimental factor. The optimal experimental results were: the operating speed of 2.4 km/h, vibration frequency of 6.5 Hz, negative pressure of 6 kPa, and the corresponding performance indexes were as following: the eligible index was 94.2, the missing index was 1.7 and the multiple index was 4.1, which could completely meet the requirement of technical specifications of quality evaluation in China. This study can provide references for further improving quality, optimizing the parameter for pneumatic disc seed-metering device and designing the potato planter used in farmland. The damage of mini-tuber caused by the machine was researched, and the breakage rate was under 1% with different vibration frequencies.
Number of references: 26
Main heading: Seed
Controlled terms: Design - Feeding - Plates (structural components) - Pneumatic materials handling equipment - Pneumatics - Tubes (components) - Vibration analysis - Vibrations (mechanical)
Uncontrolled terms: Geometric dimensions - Mini-tuber - Movement characteristics - Parameter combination - Seed metering devices - Seeding performance - Technical specifications - Theoretical calculations
Classification code: 408.2 Structural Members and Shapes
Structural Members and Shapes
- 619.1 Pipe, Piping and Pipelines
Pipe, Piping and Pipelines
- 632.3 Pneumatics
Pneumatics
- 632.4 Pneumatic Equipment and Machinery
Pneumatic Equipment and Machinery
- 691.1 Materials Handling Equipment
Materials Handling Equipment
- 691.2 Materials Handling Methods
Materials Handling Methods
- 821.4 Agricultural Products
Agricultural Products
- 931.1 Mechanics
Mechanics
Numerical data indexing: Frequency 6.50e+00Hz, Percentage 1.00e+00%, Pressure 6.00e+03Pa, Velocity 6.67e-01m/s
DOI: 10.6041/j.issn.1000-1298.2016.12.005
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
4. Effects of dry-wet cycles on evolution characteristics of farmland soil desiccation cracks
Accession number: 20165203163260
Authors: Zhang, Zhanyu (1); Li, Wenjie (1); Wang, Ce (1); Chen, Yu (1); Fan, Shimin (1)
Author affiliation: (1) Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China, Ministry of Education, Hohai University, Nanjing; 210098, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 172-177 and 252
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming to investigate the evolution characteristics of soil desiccation cracks with multiple dry-wet cycles, laboratory tests were carried out to quantitatively analyze the geometric and morphological characteristics of cracks. It indicated that the soil was cracked at the same position during each dry-wet cycle, and behaved a similar crack closure law. The crack ratio was decreased slowly before moisture content was increased to 12%, and decreased rapidly when moisture content reached 18%, while it was remained stable when moisture content was between 12% and 18%. Both the crack length density and connectivity index were decreased quickly after got a critical moisture content, which was reduced with the increase of dry-wet cycles, respectively, and kept constant before that. However, the initial cracking law was greatly affected by the first dry-wet cycle. Since the second cycle, the acceleration of crack ratio was decreased when the moisture content was changed from 30% to 20%, and about 90% of the crack was developed before moisture content reduced to 30%, and the connectivity index was increased at a constant speed when moisture content was larger than 14%. When the dry-wet cycles were increased, it can be concluded that: the crack morphology and length were kept stable; the cracking moisture content was reduced and the connectivity of crack network was enhanced, but there were no obvious differences; the average crack width and stable crack ratio were decreased gradually, and the average width tended to be the same, which weakened the crack preferential. The research result has practical guiding for cracked soil irrigation.
Number of references: 21
Main heading: Cracks
Controlled terms: Crack closure - Driers (materials) - Moisture - Moisture determination - Soils
Uncontrolled terms: Connectivity indices - Crack morphology - Critical moisture content - Desiccation cracks - Dry-wet cycle - Evolution characteristics - Morphological characteristic - Soil desiccations
Classification code: 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 803 Chemical Agents and Basic Industrial Chemicals
Chemical Agents and Basic Industrial Chemicals
- 944.2 Moisture Measurements
Moisture Measurements
Numerical data indexing: Percentage 1.20e+01%, Percentage 1.20e+01% to 1.80e+01%, Percentage 1.40e+01%, Percentage 1.80e+01%, Percentage 3.00e+01% to 2.00e+01%, Percentage 3.00e+01%, Percentage 9.00e+01%
DOI: 10.6041/j.issn.1000-1298.2016.12.021
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
5. Design and test on lab-scale intelligent membrane-covered aerobic composting reactor
Accession number: 20165203163268
Authors: Sun, Xiaoxi (1); Ma, Shuangshuang (1); Han, Lujia (1); Huang, Guangqun (1)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China
Corresponding author: Huang, Guangqun(huangguangqun@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 240-245
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The technology of membrane-covered compost is a good choice to more efficiently, environmentally and cost-effectively solve the problem of agriculture wastes’ pollution. Researchers, company and government pay more attention to this new compost technology, while limited research can be only developed in composting plant. In order to develop membrane-covered compost test in laboratory, an lab-scale intelligent membrane-covered aerobic composting reactor test system was presented, including fermentation system, gas distribution system, membrane-covered system and control system. In accordance with the thermodynamics and relevant principles, the whole system and subsystem of the reactor were optimized. The reactor tank was cylindrical and volume of the tank was 90 L. Aeration system can provide an accurate aeration with a frequency control fan, the maximum aeration rate was 20 L/min and the aeration accuracy was 0.1 L/min. A selected pervious membrane-covered system was designed which used PTFE as a core material compared with traditional aerobic composting reactor system. The membrane-covered system and fermentation system were connected by seats. A system of measurement and control was developed that can achieve temperature, oxygen concentration, pressure, aeration and gas real-time accurate monitoring and multivariate feedback control. The results of property test showed that the compost tests results were good according to main physical, chemical and biological indicators. In conclusion, various requests of compost tests can be satisfied by the lab-scale intelligent membrane-covered aerobic composting reactor system.
Number of references: 21
Main heading: Membrane technology
Controlled terms: Agricultural wastes - Composting - Coremaking - Design - Fermentation - Indicators (chemical) - Laboratories - Membranes - Radioactive waste disposal - Tanks (containers) - Testing - Thermodynamics - Waste treatment
Uncontrolled terms: Aerobic composting - Chemical and biologicals - Compost technologies - Fermentation systems - Oxygen concentrations - Property tests - Reactor - System of measurements
Classification code: 452.4 Industrial Wastes Treatment and Disposal
Industrial Wastes Treatment and Disposal
- 534.2 Foundry Practice
Foundry Practice
- 619.2 Tanks
Tanks
- 622.5 Radioactive Wastes
Radioactive Wastes
- 641.1 Thermodynamics
Thermodynamics
- 801 Chemistry
Chemistry
- 804 Chemical Products Generally
Chemical Products Generally
- 821.5 Agricultural Wastes
Agricultural Wastes
- 951 Materials Science
Materials Science
Numerical data indexing: Volume 9.00e-02m3
DOI: 10.6041/j.issn.1000-1298.2016.12.029
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
6. Characteristics of flow field near membrane surface in submerged membrane bioreactor based on PIV fluorescent particle method
Accession number: 20165203163286
Authors: Li, Chunli (1); Guo, Jinjun (2); Wang, Zhiqiang (1); Tian, Rui (1, 2)
Author affiliation: (1) College of Energy and Power Engineering, Inner Mongolia University of Technology, Huhhot; 010051, China; (2) Key Laboratory of Wind Energy and Solar Energy, Ministry of Education, Inner Mongolia University of Technology, Huhhot; 010051, China
Corresponding author: Tian, Rui(tianr@imut.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 373-378
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Submerged membrane bio-reactor (SMBR)is a high-efficiency wastewater treatment technology that combines membrane separation technology with traditional biological treatment technology. The effect that regularity of aeration intensity and aeration pore sizes on fluid mechanics characteristics of hollow fiber membrane surface was analyzed based on the PIV fluorescent particle technology. The bubbles movement of flow field near membrane surface in the aeration pore was studied when its size was 1.5 mm by using Size-Shape-Analysis modular, and the changing rule of Reynolds stress on the surface of membrane under seven aeration intensities of 24 L/h, 48 L/h, 72 L/h, 96 L/h, 140 L/h, 180 L/h and 220 L/h was investigated. The results indicated that the bubble shape was oval and its equivalent diameter was concentrated in 5~6 mm when bubble aeration was exercised by the 1.5 mm aperture with velocities on the bubble were 0.1~0.2 m/s. Aeration intensity was positively correlated with Reynolds stress. Aeration pore size of 1.5 mm and aeration intensity of 140 L/h was considered as the best aeration pore size and aeration intensity values, because it can provide a greater Reynolds stress. This subject laid a theoretical foundation for the optimization of flow field in membrane bioreactor so as to improve the membrane fouling problem.
Number of references: 23
Main heading: Two phase flow
Controlled terms: Bioconversion - Biological water treatment - Bioreactors - Flow fields - Fluid mechanics - Fluorescence - Membrane fouling - Membrane technology - Membranes - Pore size - Reynolds equation - Reynolds number - Wastewater treatment
Uncontrolled terms: Characteristics of flow fields - Fluorescent particle - Gas - liquid two-phase flows - Mechanics characteristics - Membrane separation technology - Reynolds stress - Submerged membrane bioreactors - Wastewater treatment technologies
Classification code: 445.1 Water Treatment Techniques
Water Treatment Techniques
- 452.4 Industrial Wastes Treatment and Disposal
Industrial Wastes Treatment and Disposal
- 461.8 Biotechnology
Biotechnology
- 631.1 Fluid Flow, General
Fluid Flow, General
- 741.1 Light/Optics
Light/Optics
- 801.2 Biochemistry
Biochemistry
- 931.1 Mechanics
Mechanics
- 951 Materials Science
Materials Science
Numerical data indexing: Size 1.50e-03m, Size 5.00e-03m to 6.00e-03m, Velocity 1.00e-01m/s to 2.00e-01m/s
DOI: 10.6041/j.issn.1000-1298.2016.12.047
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
7. Effect of ultrasonic treatment on quality and taste properties of brown rice
Accession number: 20165203163271
Authors: Wang, Zhouli (1); Feng, Yanyun (2); Yue, Tianli (1); Pan, Zhongli (3); Cui, Lu (1)
Author affiliation: (1) College of Food Science and Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Baoji Entry-Exit Inspection and Quarantine Bureau, Baoji; 721006, China; (3) Department of Biological and Agricultural Engineering, University of California at Davis, Davis; 95616, United States
Corresponding author: Cui, Lu(cuiluctl@nwsuaf.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 264-270
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Brown rice is rich in nutrients. However, it has not been accepted by most consumers for the poor taste and long time to be fully cooked. Brown rice was treated by groove ultrasonic, and the effect of ultrasonic treatment on physicochemical properties and taste quality of brown rice was evaluated. The results indicated that the white index of brown rice was increased slightly, and the light transmittance and grinding rate had little changing. The water-holdup and volume expansibility of brown rice were increased by 30~53 percentage points and 30 percentage points, respectively. The results showed that the brown rice treated by ultrasonic had a relatively complete structure of cortex. At the same time, the chemical composition and nutritional quality of brown rice was little lost. The evaluation of textural characteristics showed that the hardness of brown rice was reduced, chewiness and elasticity were increased with the increase of processing temperature, and the adhesion and adhesiveness were not changed. The results further showed that the brown rice treated by ultrasonic had a better sensory quality and can be easily accepted by consumers. The groove ultrasonic can be applied to cook high quality brown rice, which indicated that the groove ultrasonic had a certain application value in the brown rice processing and it had broad application prospects.
Number of references: 21
Main heading: Quality control
Controlled terms: Processing - Sensory perception - Ultrasonic equipment - Ultrasonics
Uncontrolled terms: Brown rice - Chemical compositions - Nutritional qualities - Physicochemical property - Processing temperature - Sensory qualities - Textural characteristic - Ultrasonic treatments
Classification code: 461.4 Ergonomics and Human Factors Engineering
Ergonomics and Human Factors Engineering
- 753.1 Ultrasonic Waves
Ultrasonic Waves
- 753.2 Ultrasonic Devices
Ultrasonic Devices
- 913.3 Quality Assurance and Control
Quality Assurance and Control
- 913.4 Manufacturing
Manufacturing
DOI: 10.6041/j.issn.1000-1298.2016.12.032
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
8. Effects of drip irrigation on photosynthetic characteristics and water use efficiency of jujube-cotton intercropping system
Accession number: 20165203163255
Authors: Li, Fayong (1); Lao, Dongqing (2, 3); Sun, Sanmin (1, 3); Yao, Baolin (1, 3); Sun, Liudong (1, 3)
Author affiliation: (1) College of Water Resources and Architectural Engineering, Tarim University, Aral; 843300, China; (2) College of Information Engineering, Tarim University, Aral; 843300, China; (3) Key Laboratory of Autonomous Region for Modern Agricultural Engineering, Tarim University, Aral; 843300, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 119-129
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The photosynthetic characteristics of jujube-cotton intercropping system under different cropping patterns and drip irrigation modes were studied in the southern desert oasis region of Xinjiang. The objective was to analyze the water use of cotton in intercropping system under water-saving conditions. Totally nine treatments were carried out, which were jujube-cotton spacing of 80 cm (J-1), 100 cm (J-2) and 120 cm (J-3), the control monoculture of jujube (CK-Z), control monoculture of cotton (CK-M) and different irrigation quotas of G-1 (45 mm), G-2 (60 mm), G-3 (75 mm) and G-4 (90 mm). Results showed that water demand of jujube at shoots growing stage was relatively larger than cotton, photosynthesis and transpiration rate with lower drip irrigation quota (45 mm) were significantly lower than those of other four treatments, but at this stage (cotton was at bud stage), the moisture had less effect on photosynthesis and transpiration rate of cotton. In addition, excessive irrigation (90 mm) also could reduce cotton photosynthetic. Changes of stomatal conductance were similar with transpiration rate, these parameters of jujube for G-2 treatment at shoot growth stage were significantly higher than those of other treatments, but G-1 was lower than G-2, G-3 and G-4 by 70.85%, 64.37% and 39.66%, respectively. The water demand of jujube after flowering stage was increased. Stomatal conductance of G-4 was the highest of all the treatments. The highest stomatal conductance of cotton was obtained in G-2 at bud stage, after flowering, the lower irrigation quota treatments (G-1 and G-2) also had lower stomatal conductance, when it came into the later stage of growth, stomatal conductance for each treatment was significantly decreased, compared with that at the flowering stage and boll-forming stage, it was decreased by 14.34%, 31.83%, 54.23%, 43.03% and 47.71%, respectively. Effects of spacing of jujube intercropping with cotton on cotton photosynthetic rate Pn, stomatal conductance Gs, intercellular CO2concentration Ciwere mainly occurred after the period of flowering, but the effects of transpiration rate were throughout the whole growth period. Water use efficiency of cotton with different planting spacings was in decreasing order of CK-M, J-3, J-2 and J-1, and that for different irrigation quotas was in decreasing order of CK-M, G-2, G-3, G-2 and G-4.Water use efficiency of jujube with different planting spacings was in decreasing order of J-3, CK-Z, J-2 and J-1, and that for different irrigation quotas was in decreasing order of G-1, G-3, CK-M, G-2 and G-4.It was found that photosynthetic distribution based WUEPnat different growth stages was not consistent with yield based WUEyield. Cotton at bud stage had a high WUE even at low quota of irrigation, but after entering the flowering stage, WUE was closely related to irrigation quota. WUEyieldof cotton for the whole growth period and WUEPnof cotton at bud stage was significantly related, WUEPnof other two growth stages had no significant correlation with WUEyield.
Number of references: 28
Main heading: Cultivation
Controlled terms: Carbon dioxide - Cotton - Efficiency - Irrigation - Photosynthesis - Plants (botany) - Transpiration - Water conservation
Uncontrolled terms: Drip irrigation - Intercropping - Jujube - Photosynthetic - Water use efficiency
Classification code: 444 Water Resources
Water Resources
- 461.9 Biology
Biology
- 741.1 Light/Optics
Light/Optics
- 804.2 Inorganic Compounds
Inorganic Compounds
- 821.3 Agricultural Methods
Agricultural Methods
- 821.4 Agricultural Products
Agricultural Products
- 913.1 Production Engineering
Production Engineering
Numerical data indexing: Percentage 1.43e+01%, Percentage 3.18e+01%, Percentage 3.97e+01%, Percentage 4.30e+01%, Percentage 4.77e+01%, Percentage 5.42e+01%, Percentage 6.44e+01%, Percentage 7.08e+01%, Size 1.00e+00m, Size 1.20e+00m, Size 4.50e-02m, Size 6.00e-02m, Size 7.50e-02m, Size 8.00e-01m, Size 9.00e-02m
DOI: 10.6041/j.issn.1000-1298.2016.12.016
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
9. Well-facilitied farmland construction zoning and project site selection
Accession number: 20165203163281
Authors: Sun, Qian (1); Niu, Haipeng (1); Lei, Guoping (2); Zhao, Yuling (3); Zhang, Hanwei (1); Zhang, Hebing (1)
Author affiliation: (1) College of Surveying & Land Information Engineering, Henan Polytechnic University, Jiaozuo; 454000, China; (2) Land Management Institute, Northeastern University, Shenyang; 110004, China; (3) Land Consolidation and Rehabilitation Center, Ministry of Land and Resources, Beijing; 100035, China
Corresponding author: Niu, Haipeng(niuhaipeng@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 337-346
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Well-facilitied farmland construction is an important step toward implementing the “storing grain in farmland” strategy to ensure national food security in China. Scientific zoning and project sites are important for improving grain production in an effective manner. Aiming to improve the zoning process, Xinzheng city was considered as a study area for the implementation of well-facilitied farmland construction according to the coupling coordinated degree of suitability and spatial stability. The suitability index and spatial stability index were evaluated using an improved catastrophe progression model, which avoided the problems of subjective weights and aggregated evaluation results. The results demonstrated that Xinzheng city was suitable for well-facilitied farmland construction, which was divided into four types: preferential construction, main construction, regulation construction and unsuitable construction areas, with total land areas of 27 004.83 hm2, 17 040.40 hm2, 4 361.16 hm2and 5 761.55 hm2, respectively. Areas assigned with these four types should be developed according to their specific characteristics. Thus, high-quality modern agriculture needed to be developed vigorously in the preferential construction areas. The main construction areas should be utilized efficiently with support by project regulation. The regulation construction areas needed to focus on optimizing the cultivated land layout and upgrading potential. In unsuitable construction areas, efforts should be made to restore the soil productivity, improve the ecological environment for cultivated land and enhance the capacity to resist extreme conditions. Based on zoning, hot and cold spots analysis using a geographic information system was employed to analyze the spatial patterns of the coupling coordination degree, and 10 project regions were selected accurately from these hot spot regions. Furthermore, the main obstacles in each project region were diagnosed to identify the next steps for development in Xinzheng city.
Number of references: 33
Main heading: Farms
Controlled terms: Disasters - Food supply - Geographic information systems - Grain (agricultural product) - Land use - Site selection - Zoning
Uncontrolled terms: Catastrophe progressions - Cold spots - Coordination degree - Ecological environments - Extreme conditions - Modern agricultures - Upgrading potential - Xinzheng city
Classification code: 403 Urban and Regional Planning and Development
Urban and Regional Planning and Development
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
- 821.4 Agricultural Products
Agricultural Products
- 822.3 Food Products
Food Products
- 903.3 Information Retrieval and Use
Information Retrieval and Use
DOI: 10.6041/j.issn.1000-1298.2016.12.042
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
10. Design of line-scan Raman imaging system for nondestructive detection of agricultural and livestock products safety
Accession number: 20165203163273
Authors: Zhai, Chen (1); Peng, Yankun (1); Chao, Kuanglin (2); Zhao, Juan (1); Li, Yongyu (1); Li, Yan (1)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Department of Environmental Microbiology and Food Safety, US Department of Agriculture, MD; 20705, United States
Corresponding author: Peng, Yankun(ypeng@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 279-284
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The scanning Raman imaging detection system was constructed, and the Raman spectrum and Raman image can be acquired. In accordance with the actual needs and the detection accuracy, the Raman imaging spectrometer, CCD cameras, lenses, laser light, mobile translation stage and other major components were selected. The real-time detection and analysis software of the Raman imaging detection system was developed by using LabView programming. The detection software interface was designed by applying modular and integrated design ideas to the LabView-based software development environment. By using the software, the CCD camera, laser light source and mobile translation stage controls, parameter settings and hardware detection state monitoring can be achieved, real-time collection and display of synthetic Raman image of test sample and Raman spectral curve dynamic display can also be completed. Data acquisition, analysis and calculation results saving were completed by using Matlab algorithms in LabView. The image synthesis and real-time display were completed using ENVI programming in LabView. One-button operation design was used for the software and it had the advantages of simple interface, easy operation and software portability. By combining with the software, the hardware detection system can totally meet the requirement of real-time analysis and application. Then, the system was installed and its performance was tested. The corrected spectral CCD camera can detect the Raman spectral range of -679.3~2 885.7 cm-1. The system ensured the actual spatial resolution was 0.22 mm/pixel via space calibration, stability of test performed well, and Raman images acquisition can be achieved.
Number of references: 19
Main heading: Software design
Controlled terms: Agriculture - Application programs - CCD cameras - Computer programming languages - Computer software portability - Data acquisition - Design - Hardware - Image acquisition - Imaging systems - Light sources - MATLAB - Product design - Software testing
Uncontrolled terms: Agricultural and livestock products - Analysis and calculations - Hardware detections - LabVIEW programming - Laser light sources - Nondestructive detection - Real-time collection - Software development environment
Classification code: 605 Small Tools and Hardware
Small Tools and Hardware
- 714.2 Semiconductor Devices and Integrated Circuits
Semiconductor Devices and Integrated Circuits
- 723 Computer Software, Data Handling and Applications
Computer Software, Data Handling and Applications
- 746 Imaging Techniques
Imaging Techniques
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
- 913.1 Production Engineering
Production Engineering
DOI: 10.6041/j.issn.1000-1298.2016.12.034
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
11. Simulation of N2O emission from rice-wheat rotation field under controlled irrigation of rice in Southeast China
Accession number: 20165203163262
Authors: Hou, Huijing (1); Abudu, Shalamu (2); Chen, Hui (1); Yang, Shihong (3)
Author affiliation: (1) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Texas A&M AgriLife Research Center at EI Paso, TX; 79927, United States; (3) College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing; 210098, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 185-191
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Based on the field plot experiments in Southeast China, N2O emissions from the rice-wheat rotation field under controlled irrigation of rice were simulated by using the DNDC model, and the applicability of this model in the region was analyzed. The results showed that N2O fluxes from controlled irrigation rice fields were generally higher than those from the following wheat fields, and the average flux was 3.0 times of that in the following wheat fields. DNDC model successfully simulated the rules of N2O emissions from controlled irrigation rice fields, and the correlation coefficient between the simulated and measured values was 0.79 (n=39, p2O fluxes and soil moisture regulation and fertilization. But the response of the model to the extent of soil dehydration was not sensitive enough, resulting in the slight lag of some N2O peaks. Simulated N2O fluxes from the following wheat fields were usually lower than the measured values. Compared with the measured values, the simulated value of the highest peak was increased by 14.96% (p2O emission during the rice season, wheat season and rice-wheat rotation period were 5.86%, -20.17% (p2O emission from the rice fields under controlled irrigation, but the N2O emissions from the following wheat fields were significantly underestimated. The difference between the simulated and measured values of total N2O emission from rice-wheat rotation field was small. Thus, the DNDC model can be used to simulate the N2O emissions from controlled irrigation rice fields in Southeast China, but it can not accurately simulate the N2O emissions from the following wheat fields.
Number of references: 42
Main heading: Irrigation
Controlled terms: Rotation - Soil moisture
Uncontrolled terms: Average flux - Controlled irrigations - Correlation coefficient - DNDC models - Measured values - Relative errors - Rice-wheat rotations - Wheat fields
Classification code: 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 821.3 Agricultural Methods
Agricultural Methods
- 931.1 Mechanics
Mechanics
Numerical data indexing: Percentage -2.02e+01%, Percentage -4.97e+00%, Percentage 1.50e+01%, Percentage 1.81e+01%, Percentage 5.86e+00%
DOI: 10.6041/j.issn.1000-1298.2016.12.023
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
12. Impacts of straw biochar on emission of greenhouse gas in maize field
Accession number: 20165203163254
Authors: Qu, Zhongyi (1); Gao, Lihua (1); Li, Changjian (2); Zhang, Na (1)
Author affiliation: (1) College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Huhhot; 010018, China; (2) College of Water Resources and Civil Engineering, China Agricultural University, Beijing; 100083, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 111-118
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A field experiment was conducted by using the static chamber-gas chromatography method to analyze the emission behavior of greenhouse gas (CO2, CH4and N2O), and estimate the global warming potentials (GWP) of CH4and N2O and the greenhouse gas intensity (GHGI) through different straw biochar application treatments in a maize field, including none biochar application (C0), biochar application rate of 15 t/hm2(C15), 30 t/hm2(C30) and 45 t/hm2(C45). Results showed that biochar application can significantly decrease the seasonal emissions of CO2and N2O. The emissions of CO2and N2O were decreased with the increase of biochar application rate, and the maximum decreases of CO2and N2O emission were 24.6% (C15) and 110.35% (C45), respectively, compared with those of C0.The seasonal CH4emission followed a decreasing order of C15, C30, C0 and C45, in which the maximum decrease of CH4emission for C15 was 259.62% compared with that of C0.Biochar application can also decrease the comprehensive temperature increasing potentials (GWP) and the emission intensity (GHGI) of CH4and N2O. The GWP of C15, C30 and C45 were reduced by 88.2%, 123.2% and 109.9%, respectively, and the GHGI were reduced by 88.86%, 121.60% and 100.03%, respectively, compared with those of C0.In addition, biochar application was able to increase maize yield. Compared with that of C0, the maize yield increases were 6.28%, 7.27% and 1.69% for C15, C30 and C45, respectively. The experiment demonstrated that C30 reached the most decrease of GWP and GHGI and increase of maize yield. Therefore, biochar application with a rate of 30 t/hm2can achieve the purposes of yield increase, carbon fixation and emission reduction under the current maize filed management measures.
Number of references: 45
Main heading: Gas chromatography
Controlled terms: Carbon - Carbon dioxide - Emission control - Gases - Global warming - Greenhouse gases - Temperature
Uncontrolled terms: Bio chars - Emission behavior - Emission intensity - Emission reduction - Global warming potential - Maize - Management measures - Seasonal emissions
Classification code: 443.1 Atmospheric Properties
Atmospheric Properties
- 451.1 Air Pollution Sources
Air Pollution Sources
- 451.2 Air Pollution Control
Air Pollution Control
- 641.1 Thermodynamics
Thermodynamics
- 802.3 Chemical Operations
Chemical Operations
- 804 Chemical Products Generally
Chemical Products Generally
- 804.2 Inorganic Compounds
Inorganic Compounds
Numerical data indexing: Percentage 1.00e+02%, Percentage 1.10e+02%, Percentage 1.22e+02%, Percentage 1.23e+02%, Percentage 1.69e+00%, Percentage 2.46e+01%, Percentage 2.60e+02%, Percentage 6.28e+00%, Percentage 7.27e+00%, Percentage 8.82e+01%, Percentage 8.89e+01%
DOI: 10.6041/j.issn.1000-1298.2016.12.015
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
13. Characteristics of electro-field in electro-hydrodynamics atomization with double capillary
Accession number: 20165203163248
Authors: Wang, Zhentao (1); Zhang, Yonghui (1); Sau, Amalendu (2); Xia, Lei (1); Zhan, Shuiqing (1)
Author affiliation: (1) School of Energy and Power Engineering, Jiangsu University, Zhenjiang; 212013, China; (2) School of Mechanical and Aerospace Engineering, Gyeongsang National University, Jinju-si; 660701, Korea, Republic of
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 62-69 and 76
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to investigate the effect of electric field formed by charged capillary on electrostatic atomization process, an electrostatic atomization system which was suitable for a single or double capillary was designed. Based on the electrostatic atomization system, a study on the atomization mode with ethanol was experimented, and the electro-spraying images were continuously recorded in memory by using high-speed camera. The dripping mode, spindle mode, oscillating-jet mode, precession mode, cone jet mode and multi-jet mode were obtained by systematically analyzing plenty of electrostatic atomization pictures. Under the experimental condition of the cone jet mode, based on the superposition principle of electric field and elliptic integral method, electric field of the single and double capillary electrode space was carried out by theoretical analysis and numerical calculation. The research results showed that electric field strength along the axis of capillary electrode reached its maximum value. The electric field was decreased with the decrease of φ and r, which represented the angle of point P to capillary axis in positive direction and the distance between points of O and P. Compared with single capillary under the same conditions, the electric field strength between the two capillaries along radial direction was decreased, while it was increased along axial direction. The angle between electric field and jet axis was from -9° to -2°. The electric field formed by the double capillary electrode was symmetrical with respect to x=0.5h plane, and the electric field intensity generated around each capillary was opposite in the x direction. Due to the characteristics of the electric field produced by two capillaries, the droplets formed by electrostatic atomization were deviated from the geometrical symmetry of the capillary.
Number of references: 20
Main heading: Jets
Controlled terms: Atomization - Capillarity - Drop formation - Electric fields - Electrodes - Electrohydrodynamics - Electrostatics - Fighter aircraft - High speed cameras - Numerical methods
Uncontrolled terms: Atomization mode - Capillary - Electric field distributions - Electric field intensities - Electric field strength - Electrostatic atomization - Experimental conditions - Superposition principle
Classification code: 631.1 Fluid Flow, General
Fluid Flow, General
- 652.1.2 Military Aircraft
Military Aircraft
- 701.1 Electricity: Basic Concepts and Phenomena
Electricity: Basic Concepts and Phenomena
- 742.2 Photographic Equipment
Photographic Equipment
- 802.3 Chemical Operations
Chemical Operations
- 921.6 Numerical Methods
Numerical Methods
- 931.2 Physical Properties of Gases, Liquids and Solids
Physical Properties of Gases, Liquids and Solids
DOI: 10.6041/j.issn.1000-1298.2016.12.009
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
14. Effect of lead-flow path on bubble controlling in piezoelectric micro-pump
Accession number: 20165203163287
Authors: Chen, Song (1); Liu, Yong (2); Kan, Junwu (1); Yang, Zhigang (2); Wen, Jianming (1); Cheng, Guangming (1)
Author affiliation: (1) Institute of Precision Machinery and Instrument, Zhejiang Normal University, Jinhua; 321004, China; (2) College of Mechanical Science and Engineering, Jilin University, Changchun; 130025, China
Corresponding author: Kan, Junwu(jutkjw@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 379-384
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The retention of gas bubbles causes serious damage to the performance of piezoelectric micro-pump, and bubble retention occurs mainly in the pump cavity, thus reducing bubble retention in the pump cavity can greatly improve the reliability of piezoelectric micro-pump. The bubble has been eliminated quickly and effectively through the method of processing lead-flow path in pump cavity. The method has the advantages of easy processing, good universality and strong operability. The relationship between bubble retention and output performance through the pressure of pump cavity and the influence of lead-flow path on bubble retention through pressure drop of the bubble and flow resistance were analyzed. Finally, the effect of lead-flow path on output performance and bubble retention was verified by experiments. The experiment results showed that the output performance of piezoelectric micro-pump can be enhanced through processing lead-flow path in pump cavity, when the lead-flow path width was 2.0 mm, the output pressure and output flow reached 17.4 kPa and 20.8 mL/min, respectively; when the lead-flow path width was 1.1 mm and 1.5 mm, the piezoelectric micro-pump had a strong ability to eliminate air bubbles. After entering 120 bubbles of 0.02 mL, the piezoelectric micro-pump still had a stable output pressure (5.8 kPa and 5.6 kPa) and output flow (16 mL/min and 5.6 mL/min). Processing lead-flow path in pump cavity can eliminate the bubbles quickly and effectively and reduce bubble retention in pump cavity.
Number of references: 21
Main heading: Pumps
Controlled terms: Piezoelectricity
Uncontrolled terms: Bubble retention - Flow path - Flow resistance - Flow-stopping phenomenen - Method of processing - Output flow - Output performance - Piezoelectric micropumps
Classification code: 618.2 Pumps
Pumps
- 701.1 Electricity: Basic Concepts and Phenomena
Electricity: Basic Concepts and Phenomena
Numerical data indexing: Pressure 1.74e+04Pa, Pressure 5.60e+03Pa, Pressure 5.80e+03Pa, Size 1.10e-03m, Size 1.50e-03m, Size 2.00e-03m, Volume 2.00e-08m3
DOI: 10.6041/j.issn.1000-1298.2016.12.048
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
15. Design and experiment on axial-flow differential-speed threshing-separating-cleaning unit
Accession number: 20165203163247
Authors: Wang, Zhiming (1, 2); Lü, Pengmin (1); Chen, Ni (2); Li, Hua (3); Liu, Zhenghuai (2); Chen, Dejun (2)
Author affiliation: (1) School of Construction Machinery, Chang’an University, Xi’an; 710064, China; (2) Department of Mechanical and Electrical Engineering, Jinhua Polytechnic, Jinhua; 321017, China; (3) College of Engineering, Nanjing Agricultural University, Nanjing; 210031, China
Corresponding author: Chen, Dejun(cdj0579@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 53-61
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to solve the problem of poor threshing ability because of the transverse space limitation and grain mound in the entrance of longitudinal cleaning sieve of axial flow threshing-separating-cleaning unit in combine harvest, a new type axial-flow differential-speed threshing-separating-cleaning unit was designed, which consisted of coaxial differential-speed threshing cylinder, conical centrifugal fan, double-layer vibration sieve and rethreshing system with helical plate toot. The test-bed at feed rate of 2 kg/s for rice was developed, the optimal structural parameters and operation parameters were explored by quadratics rotary orthogonal combination design experiment. The mathematical models of loss rate, crushing rate, impurity rate and power consumption were established by means of regression analysis. The influences of rotary speed combination of differential-speed roller, blade taper of conical centrifugal fan and length ratio of differential-speed cylinder on loss rate, crushing rate, impurity rate and power consumption had been analyzed, and multi-objective optimization based on Matlab optimum toolbox was applied. The results indicated that the sequences of factors influencing the threshing and cleaning performance about loss rate and impurity rate were rotary speed combination of differential-speed roller, blade taper of conical centrifugal fan, length ratio of differential-speed cylinder, and the sequences of factors influencing crushing rate and power consumption were rotary speed combination of differential-speed roller, length ratio of differential-speed cylinder and blade taper of conical centrifugal fan. The values of optimum scheme were 750 r/min and 850 r/min, 3.8°, 30%, respectively. The loss rate was 1.57%, broken rate was 0.71% and impurity rate was 0.38%. The total threshing power consumption was 6.67 kW/kg, and the low speed threshing cylinder and high speed threshing cylinder accounted for about 59.3% and 40.7% of total threshing power consumption, respectively. The results of field experiment indicated that the indexes of working performance of axial-flow differential-speed threshing-separating-cleaning unit were more effective than national standards. The study would provide some theoretical basis for the design of axial-flow differential-speed threshing-separating-cleaning unit.
Number of references: 17
Main heading: Speed
Controlled terms: Agriculture - Axial flow - Cleaning - Crushing - Cylinders (shapes) - Electric power utilization - Fans - Harvesters - Multiobjective optimization - Regression analysis - Rollers (machine components) - Sieves - Structural optimization - Vibrations (mechanical)
Uncontrolled terms: Coaxial differentials - Combine harvesters - Differential-speed thresh - Operation parameters - Performance tests - Re-threshing systems - Structural parameter - Threshing-separating
Classification code: 601.2 Machine Components
Machine Components
- 618.3 Blowers and Fans
Blowers and Fans
- 631.1 Fluid Flow, General
Fluid Flow, General
- 706.1 Electric Power Systems
Electric Power Systems
- 802.3 Chemical Operations
Chemical Operations
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
- 821.1 Agricultural Machinery and Equipment
Agricultural Machinery and Equipment
- 921.5 Optimization Techniques
Optimization Techniques
- 922.2 Mathematical Statistics
Mathematical Statistics
- 931.1 Mechanics
Mechanics
Numerical data indexing: Mass_Flow_Rate 2.00e+00kg/s, Percentage 1.57e+00%, Percentage 3.00e+01%, Percentage 3.80e-01%, Percentage 4.07e+01%, Percentage 5.93e+01%, Percentage 7.10e-01%, Rotational_Speed 7.50e+02RPM, Rotational_Speed 8.50e+02RPM
DOI: 10.6041/j.issn.1000-1298.2016.12.008
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
16. Design of reseed shift speed system of scoop-type metering device of corn
Accession number: 20165203163245
Authors: Zhao, Shuhong (1); Zhou, Yong (1); Liu, Hongjun (1); Tan, Hewen (1); Zhang, Xianmin (1); Yang, Yueqian (1)
Author affiliation: (1) College of Engineering, Northeast Agricultural University, Harbin; 150030, China
Corresponding author: Yang, Yueqian(yangyueqian@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 38-44
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming to solve the problem of leakage webcasting for corn seedmeter, a reseed shift speed system was designed, which used photoelectric sensor to early detect at the position deviated from the kinds of ports by 20°, and a stepping motor changed seedmeter when leakage occurred sowing speed over the empty slot to achieve real replant seed purposes. In order to make the shift to replant system have the versatility, specifically representative corn grain appearance shape varieties were selected, including Jiulong No. 5 (spherical), Jiudan No. 57 (cone) and Zhengdan No. 958 (rectangle). Taking different speeds as test factors, the seeding performance was studied by using of EDEM software and seeding performance test bed, simulation results showed that when the speed was not exceeded 23.1 r/min, the impact of speed shifting on seeding performance was not more than 2%, when the rotational speed reached 32.3 r/min, serious shaking phenomenon of seed would happen. Test results showed that the scoop-type replant seed metering systems equipped with variable speed when the rotation speed was 13.9~23.1 r/min, drain sowing rate was not exceeded 1.4%, the average replant rate was 89.95%, seeding rate reached 98.7%; at the speed of 27.7 r/min, compared with the original scoop-style metering, its row seed sowing leakage index was decreased by 10.4%, the effect of replanting was the most obvious; when the speed reached 32.3 r/min, the effect of replanting was not obvious; the seeding performance of three corn varieties showed a decreasing trend of spherical, rectangular and cone.
Number of references: 19
Main heading: Speed
Controlled terms: Computer software - Software testing - Stepping motors
Uncontrolled terms: Corn - Different speed - EDEM - Metering devices - Photoelectric sensors - Reseed shift speed system - Rotational speed - Seeding performance
Classification code: 705.3 Electric Motors
Electric Motors
- 723 Computer Software, Data Handling and Applications
Computer Software, Data Handling and Applications
- 723.5 Computer Applications
Computer Applications
Numerical data indexing: Percentage 1.04e+01%, Percentage 1.40e+00%, Percentage 2.00e+00%, Percentage 9.00e+01%, Rotational_Speed 1.39e+01RPM to 2.31e+01RPM, Rotational_Speed 2.31e+01RPM, Rotational_Speed 2.77e+01RPM, Rotational_Speed 3.23e+01RPM
DOI: 10.6041/j.issn.1000-1298.2016.12.006
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
17. Advances in nutrition and health function of cheese
Accession number: 20165203163270
Authors: Luo, Jie (1); Ren, Fazheng (1); Wu, Hongyan (2); Wang, Ziwei (3); Wang, Jing (3)
Author affiliation: (1) The Innovation Centre of Food Nutrition and Human Health, China Agricultural University, Beijing; 100083, China; (2) Army General Hospital, Beijing; 100070, China; (3) Key Laboratory of Functional Dairy, China Agricultural University, Beijing; 100083, China
Corresponding author: Ren, Fazheng(renfazheng@263.net)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 253-263
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Cheese is the dietetic mainbody in developed countries, as well as the research hotspot of dairy science. Cheese owns extremely high nutritional and biological values and becomes one of the largest trade of dairy products over the world. As the adjustment of diet structure and deepening understanding of cheese nutritional value, China’s per capita cheese consumption has largely increased, but it was still far behind the average level of the world. There is a large market space for cheese development in China, meanwhile, the nutritive values of cheese are still needed to be strengthened. The cheese nutritional components, active ingredients such as the protein and functional peptides, conjugated linoleic acid, calcium and vitamin D are introduced. In addition, the research progress of cheese nutritional component on the heath of human is discussed, such as the protective effect for dental caries, weight reduction or anti-obese effects, anti-hypertensive property, anti-atherosclerosis, beneficial effect on bone health, anti-carcinogenic effects, antioxidation, and so on. In addition, the research direction of the development of cheese nutrition is put forward, such as the improvement of sensory quality and nutritional function of low fat cheese, development of probiotics cheese, mechanism of the anti-carcinogenic effect of cheese, as well as the effect of cheese on the cardiovascular system. In conclusion, the nutritional value of cheese is reviewed, on this basis, it can provide a reference for cheese industry development in China.
Number of references: 121
Main heading: Nutrition
Controlled terms: Cardiovascular system - Cheeses - Commerce - Fatty acids - Health - Linoleic acid
Uncontrolled terms: Active ingredients - Advances - Beneficial effects - Carcinogenic effects - Conjugated linoleic acid - Developed countries - Functional peptides - Protective effects
Classification code: 461 Bioengineering and Biology
Bioengineering and Biology
- 804.1 Organic Compounds
Organic Compounds
- 822.3 Food Products
Food Products
DOI: 10.6041/j.issn.1000-1298.2016.12.031
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
18. Calculation and test on trajectory of automotive engine timing chain system
Accession number: 20165203163284
Authors: Fan, Chengyan (1); Xu, Shuxin (1); Cheng, Yabing (2); Meng, Fanzhong (1)
Author affiliation: (1) Chain Transmission Institute, Jilin University, Changchun; 130025, China; (2) College of Mechanical Science and Engineering, Jilin University, Changchun; 130025, China
Corresponding author: Xu, Shuxin(shuxinxu@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 361-366
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: On the basis of three-axis coordinate (crankshaft coordinate, intake and exhaust camshaft coordinate) of valve timing mechanism, the geometric layout of timing chain, design calculation method of trajectory and constraint boundary are studied. By using the method of piecewise arc or straight line approximation, the length calculation formula is presented according to the curve’s camber of tension edge and guiding edge. Using the cylinder head of anti drag system test bench, the change rules of transverse vibration displacement of tension plate and noise characteristics at different rotating speeds is studied under the condition of simulating real time chain system alternating load and working environment. With this timing chain system walking trajectory calculation method, under the premise of keeping the system proper tensioning, between the timing chain elongation and the amount of plunger out of tension device has better harmonic relationship. At the same time, the timing chain system is at the normal speed of engine, the transverse displacement of tension edge and noise characteristic of timing chain system can meet the requirements of automotive engine’s power performance. The results provide a new method and approach for the design and evaluation of timing chain system of automotive engine. It has important significance to the wide application of the chain transmission in the automobile and other high technology fields.
Number of references: 18
Main heading: Chains
Controlled terms: Automobile engines - Crankshafts - Engines - Powertrains - Testing - Timing circuits - Trajectories - Vibrations (mechanical)
Uncontrolled terms: Automotive engine - Automotive engine timing chain - Constraint boundaries - Design and evaluations - Design method - Timing chain - Transverse displacements - Transverse vibrations
Classification code: 601.2 Machine Components
Machine Components
- 602.1 Mechanical Drives
Mechanical Drives
- 661.1 Automotive Engines
Automotive Engines
- 662.4 Automobile and Smaller Vehicle Components
Automobile and Smaller Vehicle Components
- 713.4 Pulse Circuits
Pulse Circuits
- 931.1 Mechanics
Mechanics
DOI: 10.6041/j.issn.1000-1298.2016.12.045
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
19. Comparison of stochastic parameter simulation methods based on regional scale border irrigation numerical model
Accession number: 20165203163256
Authors: Dong, Qin’ge (1); Xu, Di (2); Li, Yinong (2); Zhang, Shaohui (2); Bai, Meijian (2)
Author affiliation: (1) Institute of Water and Soil Conservation, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resource and Hydropower Research, Beijing; 100038, China
Corresponding author: Xu, Di(xudi@iwhr.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 130-138 and 91
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The uncertainty of border irrigation parameters will directly affect the simulation results of border irrigation flow model for surface irrigation management at regional scale. Latin hypercube sampling (LHS), updated Latin hypercube sampling (ULHS) and simple Monte Carlo sampling (SMCS) are studied in sampling convergence, stability and simulation efficiency based on regional scale border irrigation simulation method and soil properties spatial randomness. In terms of the sampling accuracy, ULHS and LHS can satisfactorily represent the statistical characteristics of soil bulk density. In the simulation convergence aspect, ULHS has the faster convergence than LHS and SMCS, which indicates that ULHS can significantly improve the sampling quality and reduce the sampling frequency. In the simulation accuracy, simulation times of ULHS are less than those of LHS and SMCS, simulation accuracy and distribution pattern are better than those of LHS and SMCS. Stability simulation of ULHS is better than those of LHS and SMCS. Computational efficiency of ULHS is increased by 0.23-fold and 1.8-fold than those of LHS and SMCS, respectively. Convergence rate of ULHS is faster than those of LHS and SMCS. In addition, ULHS can improve computational efficiency and sampling stability. ULHS can help to improve the simulation performance of regional scale border irrigation stochastic simulation model.
Number of references: 25
Main heading: Monte Carlo methods
Controlled terms: Computational efficiency - Efficiency - Intelligent systems - Irrigation - Numerical methods - Sampling - Soils - Stochastic models - Stochastic systems
Uncontrolled terms: Border irrigation - Latin hypercube sampling - Simulation performance - Soil property - Spatial variability - Stability and simulations - Statistical characteristics - Stochastic simulation model
Classification code: 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 723.4 Artificial Intelligence
Artificial Intelligence
- 821.3 Agricultural Methods
Agricultural Methods
- 913.1 Production Engineering
Production Engineering
- 921.6 Numerical Methods
Numerical Methods
- 922.1 Probability Theory
Probability Theory
- 922.2 Mathematical Statistics
Mathematical Statistics
- 961 Systems Science
Systems Science
DOI: 10.6041/j.issn.1000-1298.2016.12.017
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
20. Fast segmentation method of yellow feather chicken based on difference of color information in different color models
Accession number: 20165203163275
Authors: Bi, Minna (1); Zhang, Tiemin (1, 2); Zhuang, Xiaolin (1); Yang, Xiuli (1); Liang, Li (1); Jiao, Peirong (3)
Author affiliation: (1) College of Engineering, South China Agricultural University, Guangzhou; 510642, China; (2) National Pig Seed Engineering Technology Research Center, Guangzhou; 510642, China; (3) College of Veterinary Medicine, South China Agricultural University, Guangzhou; 510642, China
Corresponding author: Zhang, Tiemin(tm-zhang@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 293-298 and 308
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The first step to identify the sick chicken in the farms by machine vision system is segment of object from images fast and correctly. However, it is a challenge to extract the chicken from pictures because of the complex background. A segmentation method based on the difference of three components of RGB model and HSV model was presented to extract yellow feather broilers from the image. Totally 200 images were taken under the natural environment by using digital cameras and iPhone 6.Totally 30 images were selected from 200 images to setup pixels data sets for the color components analysis. Background and feather data sets included 10 sample areas in each selected image. Each sample area had 10×10 pixels. Comb data sets had three sample areas of each selected image and included 5×5 pixels for each sample area. All data sets were analyzed in the different color models, such as RGB, HSV, L*a*b*. It was found that the value of R, G, B components of the background and the chicken belly was nearly the same or very close while the average value was different. This characteristic was used to abandon the background pixels in the RGB model. Then the remaining part of the image was converted to the HSV color model. The research obtained H component threshold for comb and feather by statistics data sets, respectively. Totally 102 images were processed in the experiment. The result showed that segmentation accuracy of yellow feather broilers from images using the proposed method was 86.3%, which was better than that of L*a*b*color model (78.4%). This method was simple with short calculation time and was suitable for real-time segmentation.
Number of references: 21
Main heading: Image processing
Controlled terms: Animals - Color - Color codes - Colorimetry - Computer vision - Image segmentation - Pixels
Uncontrolled terms: Color difference - Color modeling - Machine vision systems - Natural environments - Real-time segmentation - Segmentation accuracy - Segmentation methods - Yellow feather chicken
Classification code: 741.1 Light/Optics
Light/Optics
- 741.2 Vision
Vision
- 941.4 Optical Variables Measurements
Optical Variables Measurements
Numerical data indexing: Percentage 7.84e+01%, Percentage 8.63e+01%
DOI: 10.6041/j.issn.1000-1298.2016.12.036
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
21. Analysis of flow regime and pressure pulsations under off-design condition in pump mode of pump-turbine
Accession number: 20165203163250
Authors: Zhu, Di (1); Xiao, Ruofu (1); Tao, Ran (1); Liu, Weichao (2)
Author affiliation: (1) College of Water Resources and Civil Engineering, China Agricultural University, Beijing; 100083, China; (2) Research and Test Center, Dongfang Electric Machinery Co., Ltd., Deyang; 618000, China
Corresponding author: Xiao, Ruofu(xrf@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 77-84
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The operation stability of pump turbine has a great impact on the pumped storage units. When the flow rate decreases, unstable head variations occur. Unstable working conditions will lead to unsafe operation. In order to study the detailed characteristics of flow regime and pressure pulsation of pump-turbine under different operating conditions, the internal flow and pressure pulsation for a model pump-turbine under two different guide vane opening angles from low to large flow of flow rates were analyzed. As the guiding mechanism, the guide vanes had interference on the flow. The results of the investigation showed that under both low flow rate with small guide vane opening angle and large flow rate with large guide vane opening angle, the pressure pulsations were small. Pressure value fluctuations were also small and the flow was steady. On the contrary, the pressure pulsations were large under both low flow rate with large guide vane opening angle and large flow rate with small guide vane opening angle. However, it was affected by many low-frequency under low flow rate with large guide vane opening angle and large flow with small guide vane opening angle. The components of frequency were more complex. Pressure pulsation amplitude and head fluctuations were increased. The internal flow was disordered. The head also had obvious pulsation. All of the above resulted in the poor operation stability. It showed that the matching relationship between guide vane opening and flow affected the operation stability. All the results provided reliable reference for improving the stability of pump-turbine under off-design operations.
Number of references: 21
Main heading: Hydraulic turbines
Controlled terms: Computer simulation - Flow rate - Pumped storage power plants - Stability - Turbines
Uncontrolled terms: Different operating conditions - Guide vane openings - Internal flows - Off design condition - Operation stability - Pressure pulsation - Pump-turbines - Pumped-storage units
Classification code: 611.1 Hydroelectric Power Plants
Hydroelectric Power Plants
- 617.1 Hydraulic Turbines
Hydraulic Turbines
- 631 Fluid Flow
Fluid Flow
- 723.5 Computer Applications
Computer Applications
DOI: 10.6041/j.issn.1000-1298.2016.12.011
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
22. Scattered point clouds surface fitting based on immune genetic and ant colony algorithm
Accession number: 20165203162993
Authors: Fu, Wei (1); Wu, Lushen (1); Chen, Huawei (1)
Author affiliation: (1) School of Mechanical and Electrical Engineering, Nanchang University, Nanchang; 330031, China
Corresponding author: Wu, Lushen(wulushen@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 424-430
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The surface fitting method of complex surface object was researched, which inclued the processes of parameterization of point cloud data, immune genetic algorithm (IGA) based adaptive node calculation, reversing of curve control points, segmentation of point cloud and surface stitching constitute surface fitting. Fusion of immune genetic algorithm and ant colony system fitting algorithm was proposed in surface. The immune genetic algorithm was introduced into the iterative process of each ant colony, and the ability of local optimization and global search ability of immune genetic algorithm can improve the convergence speed of ant colony. In the algorithm, the immune genetic algorithm can effectively overcome the shortcomings of ant colony system which easily trap into local optimal solution or degradation by selecting, intersecting and mutating of genetic algorithm along with the immune vaccination of immune algorithm. The fender, fandisk, bunny and cow of the 3D scattered points cloud were fitted by fusion algorithm, genetic algorithm (GA) and immune genetic algorithm (IGA). The experiments showed that the new algorithm was very excellent in convergence speed and global optimal solution search capability. The fitting surface of this algorithm was better than those of GA and IGA in fitting precision with fitting precision improved by 18% and 11%, respectively, which can meet the requirements of complex curved surfaces.
Number of references: 24
Main heading: Genetic algorithms
Controlled terms: Ant colony optimization - Curve fitting - Fiber optic sensors - Iterative methods - Optimal systems - Optimization - Surface scattering
Uncontrolled terms: Ant colony algorithms - Complex curved surface - Global optimal solutions - Immune genetic algorithms - Local optimal solution - Scattered point clouds - Surface fitting - Surface fitting method
Classification code: 741.1.2 Fiber Optics
Fiber Optics
- 921.5 Optimization Techniques
Optimization Techniques
- 921.6 Numerical Methods
Numerical Methods
- 931 Classical Physics; Quantum Theory; Relativity
Classical Physics; Quantum Theory; Relativity
- 961 Systems Science
Systems Science
Numerical data indexing: Percentage 1.10e+01%, Percentage 1.80e+01%
DOI: 10.6041/j.issn.1000-1298.2016.12.054
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
23. Applicability of FAO penman-monteith and alternative methods for estimating reference evapotranspiration in Northwest China
Accession number: 20165203163257
Authors: Wu, Lifeng (1); Bai, Hua (1); Zhang, Fucang (2); Lu, Xianghui (1); Wang, Jiawen (1); Liu, Huiying (1)
Author affiliation: (1) State-province United Engineering Laboratory on Water Engineering Safety and Resources Efficient Utilization of Poyang Lake Basin, Nanchang Institute of Technology, Nanchang; 330099, China; (2) Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling; Shaanxi; 712100, China
Corresponding author: Zhang, Fucang(zhangfc@nwsuaf.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 139-151
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to implement the high precision of predicting reference evapotranspiration (ET0) when the meteorological information was not complete in northwest of China, FAO Penman-Monteith (P-M) formula was selected as control, 15 alternative methods were compared in Northwest China, including P-M formula with one to three factors of global solar radiation, sunshine hours duration, relative humidity, wind speed were missing, Pristley-Taylor(P-T)method, Makkink method, Hargreaves-Samani (H-S)method and Irmak method. At last, parameters of P-T method, H-S method, Makkink method and Irmak method were recalibrated. The results showed that global solar radiation data missing had the minimum impact on estimating ET0with average R2of 0.983 for all stations and the root mean square error (RMSE) was less than 0.4 mm/d. When one of sunshine hour duration, wind speed or relative humidity data was missing, applying the FAO recommended P-M alternative methods could control RMSE within 0.47 mm/d, R2stayed above 0.94.When wind speed and relative humidity data were missing, Makkink method was the best method, the RMSE was 0.68 mm/d and R2was 0.94.When there was only temperature data, the improved Irmak and improved H-S methods had the same precisions with RMSE of 0.63 mm/d and 0.68 mm/d, the R2were 0.94 and 0.95, respectively. In addition, the parameters of P-T, Makkink, H-S and Irmak methods were recalibrated for the Kriging interpolation, to obtain the spatial distribution of parameters. The required values of parameters for these methods can be got through the figures.
Number of references: 23
Main heading: Wind
Controlled terms: Evapotranspiration - Humidity control - Interpolation - Mean square error - Solar radiation
Uncontrolled terms: Data missing - Global solar radiation - Global solar radiation data - Meteorological information - NorthWest China - Parameters calibrations - Reference evapotranspiration - Root mean square errors
Classification code: 443.1 Atmospheric Properties
Atmospheric Properties
- 657.1 Solar Energy and Phenomena
Solar Energy and Phenomena
- 921.6 Numerical Methods
Numerical Methods
- 922.2 Mathematical Statistics
Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2016.12.018
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
24. Identification of flow pattern of microchannel nanofluid gas-liquid two-phase flow based on k-means clustering
Accession number: 20165203163288
Authors: Xiao, Jian (1, 2); Luo, Xiaoping (1); Feng, Zhenfei (1, 3)
Author affiliation: (1) School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou; 510640, China; (2) Department of Mechanical and Electrical Engineering, Guangdong University of Science and Technology, Dongguan; 523083, China; (3) School of Chemistry and Chemical Engineering, Guangxi University, Nanning; 530004, China
Corresponding author: Luo, Xiaoping(mmxpluo@scut.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 385-390
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A novel approach for identification of flow pattern of micro-channel nanofluid gas-liquid two-phase flow was presented based on K-means for the purpose of improving the accuracy and efficiency of flow patterns identification. The proposed flow pattern identification method acquired the whole flow pattern images of the gas-liquid two-phase flow of micro-channel with high-speed camera firstly. In the second place, peak values which were obtained by histogram of gray scale, flow pattern images were thought of as the original center point of K-means clustering. As for the final step, similarity identification of different flow pattern images was carried out with the principles of invariant moment theory and Euclidean distance. The accuracy and efficiency of the proposed flow pattern identification method were demonstrated with the precision-ratio and recall-ratio assessment system as well as time-consuming analysis results of fifty five hundred pieces of flow pattern images identification experiment. Experimental results showed that the overall identification rate of the new flow pattern identification method based on K-means clustering was 97.8%, while the identification rate of slug flow was up to 100% and that of bubble flow was able to reach 100% as well. The new method provided a novel perspective for the online identification of flow pattern of micro-channel nanofluid two-phase flow.
Number of references: 23
Main heading: Two phase flow
Controlled terms: Efficiency - Flow patterns - High speed cameras - Image processing - Liquids - Nanofluidics
Uncontrolled terms: Euclidean distance - Flow pattern identification - Gas - liquid two-phase flows - Identification rates - K-means clustering - Nanofluids - On-line identification - Time consuming analysis
Classification code: 631.1 Fluid Flow, General
Fluid Flow, General
- 742.2 Photographic Equipment
Photographic Equipment
- 761 Nanotechnology
Nanotechnology
- 913.1 Production Engineering
Production Engineering
Numerical data indexing: Percentage 1.00e+02%, Percentage 9.78e+01%
DOI: 10.6041/j.issn.1000-1298.2016.12.049
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
25. Defect judgment of 5-CS rigid-body guidance mechanism
Accession number: 20165203162990
Authors: Hu, Junjie (1); Han, Jianyou (1); Cui, Guangzhen (1)
Author affiliation: (1) School of Mechanical Engineering, University of Science and Technology Beijing, Beijing; 100083, China
Corresponding author: Han, Jianyou(jyhan@ustb.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 398-407 and 415
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A 5-CS rigid-body guidance linkage was proposed. A method to judge the defects of 5-CS linkage was proposed to solve the problems of defect judgment met in the process of rigid-body guidance design. Through calculating the Jacobian matrix’s determinant values of the given positions, it can be found out whether the signs of determinant values were changed at the given positions. If the signs were changed, the linkage had defects. If not, a curve tracking technique which based on Newton method was used to get the forward position solutions and then calculate the Jacobian matrix’s determinant values of the positions between the given positions. Based on the calculations, we can know whether there were positions which determinant values are zeros between the given positions. When the Jacobian matrix’s determinant value was zero, the linkage’s singular configuration occurred. According to the trajectory, we can clearly know whether the linkage has circuits or order defects. For solving the branch defect, the method of drives combinations was proposed. When the parameters of the linkage at a position were given, different Jacobian matrix’s determinant values can be got by selecting different drivers. So the branch defects can be avoided by changing the drive before the singular positions. Finally, a synthesis example was provided to illustrate the defect judgment process of 5-CS linkage.
Number of references: 19
Main heading: Jacobian matrices
Controlled terms: Defects - Newton-Raphson method - Rigid structures
Uncontrolled terms: 5-CS linkage - Rigid body - Singular configurations - Singular positions - Tracking techniques
Classification code: 408 Structural Design
Structural Design
- 921.1 Algebra
Algebra
- 921.6 Numerical Methods
Numerical Methods
- 951 Materials Science
Materials Science
DOI: 10.6041/j.issn.1000-1298.2016.12.051
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
26. Soil moisture-heat transfer and its action mechanism of freezing and thawing soil
Accession number: 20165203163253
Authors: Fu, Qiang (1); Hou, Renjie (1); Li, Tianxiao (1); Ma, Ziao (1); Peng, Li (1)
Author affiliation: (1) School of Water Conservancy & Civil Engineering, Northeast Agricultural University, Harbin; 150030, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 99-110
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The moisture-temperature variation and spatial migration of seasonal freezing and thawing soil is a complex dynamic system, as an important part of energy circulation in nature, the soil moisture and heat system of freezing and thawing soil plays an extremely important role in water resources, environment, energy and human engineering, etc. Research on moisture and temperature diffuse mechanism details of freezing and thawing soil and getting hold of soil moisture and heat transfer condition accurately can make a profound influence on producing scientific and reasonable spring sowing system. In order to utilize resources of frozen soil efficiently, promote agricultural economy and improve ecological environment, on the basis of summarizing the research achievements in China, the physical process of soil freezing and thawing, the water infiltration in frozen region, heat transfer and the transformation of soil solute were expatiated, the summary of response mechanism of water and heat distribution of freezing and thawing soil to the change of surface environment and difference of climatic factors was given, and the characteristic parameters of freezing and thawing soil, dynamic simulation of coupled water and heat and forecasting model on mechanism were discussed. Meanwhile, the research ideas on combination structure of multi-scale, oil-cover union inversion, parallel operation of statistical and stochastic mode were proposed to provide references for moisture and temperature circulation of seasonal frozen, studying on balance of water and heat, and guiding the agricultural production scientifically and reasonably in cold and arid regions.
Number of references: 100
Main heading: Soils
Controlled terms: Agriculture - Dynamics - Freezing - Frozen soils - Heat transfer - Human engineering - Moisture - Soil mechanics - Soil moisture - Stochastic systems - Thawing - Water resources
Uncontrolled terms: Agricultural productions - Characteristic parameters - Combination structure - Complex dynamic systems - Coupling modeling - Ecological environments - Freezing and thawing soils - Moisture and heat transfers
Classification code: 444 Water Resources
Water Resources
- 461.4 Ergonomics and Human Factors Engineering
Ergonomics and Human Factors Engineering
- 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 641.2 Heat Transfer
Heat Transfer
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
- 961 Systems Science
Systems Science
DOI: 10.6041/j.issn.1000-1298.2016.12.014
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
27. Detection of pesticide residues on lettuce leaves based on piece-wise discrete wavelet transform and hyperspectral data
Accession number: 20165203163279
Authors: Sun, Jun (1, 2); Zhou, Xin (1); Mao, Hanping (2); Wu, Xiaohong (1); Yang, Ning (1); Zhang, Xiaodong (2)
Author affiliation: (1) School of Electrical and Information Engineering, Jiangsu University, Zhenjiang; 212013, China; (2) Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang; 212013, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 323-329
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to fast, accurately and nondestructively detect pesticide residues in lettuce, combining discrete wavelet transform (DWT) algorithm with the approximate position of frequency doubling center of organic compounds in near infrared spectra, a method of feature extraction algorithm of piece-wise discrete wavelet transform (PDWT) was proposed. PDWT was used to extract the feature of four different concentrations of pesticide residues on the lettuce leaves. Transmission electron microscope (TEM) was carried out to detect the microstructure of lettuce. Hyperspectral image acquisition system was used to get information of near infrared hyperspectral image of lettuce, and the region of interest (ROI) was selected to get the near infrared spectrum data of the lettuce samples, which was ranged from 870 nm to 1800 nm. According to the approximate position of organic compounds in near infrared spectral region, appropriate piecewise paragraphs were selected. Each section of the spectral data was divided into seven layers by PDWT in turn, using sym5 as the basis function. Then, based on the analysis of the singular value of the high frequency wavelet coefficient curve, the characteristic band of lettuce was extracted by the optimal decomposition layer, which was the largest corresponding to the characteristic difference of the singular value. In order to evaluate the value of the feature extracted by singular value, a parameter of fit degree (FD) was proposed. Combined with the SVM classification accuracy, the feature extracted by PDWT was further evaluated. The results showed that under different concentrations of pesticide residues, the arrangement and structure of internal cells of lettuce leaves were different. The spectra of different concentrations of pesticide residues were different. PDWT had a higher classification accuracy of predictive classification compared with that of SVM. The classification accuracy of FD, calibration, cross validation and predictive classification accuracy of SVM were 75%, 95%, 92.86% and 90.63%, respectively, under the N value of 4 with PDWT. PDWT combined with FD was suitable for the feature extraction of spectrum, it provided a novel method for fast and nondestructive identification of lettuce pesticide concentration.
Number of references: 15
Main heading: Wavelet transforms
Controlled terms: Calibration - Discrete wavelet transforms - Extraction - Feature extraction - Finite difference method - Frequency doublers - Image acquisition - Image segmentation - Infrared devices - Near infrared spectroscopy - Organic compounds - Pesticides - Spectroscopy - Transmission electron microscopy - Wavelet decomposition
Uncontrolled terms: Characteristic difference - Discrete wavelet transform algorithms - Feature extraction algorithms - Lettuce - Near-infrared spectral regions - Nondestructive identification - Pesticide detection - The region of interest (ROI)
Classification code: 713.5 Electronic Circuits Other Than Amplifiers, Oscillators, Modulators, Limiters, Discriminators or Mixers
Electronic Circuits Other Than Amplifiers, Oscillators, Modulators, Limiters, Discriminators or Mixers
- 723 Computer Software, Data Handling and Applications
Computer Software, Data Handling and Applications
- 802.3 Chemical Operations
Chemical Operations
- 803 Chemical Agents and Basic Industrial Chemicals
Chemical Agents and Basic Industrial Chemicals
- 804.1 Organic Compounds
Organic Compounds
- 921.3 Mathematical Transformations
Mathematical Transformations
- 921.6 Numerical Methods
Numerical Methods
Numerical data indexing: Percentage 7.50e+01%, Percentage 9.06e+01%, Percentage 9.29e+01%, Percentage 9.50e+01%, Size 8.70e-07m to 1.80e-06m
DOI: 10.6041/j.issn.1000-1298.2016.12.040
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
28. Optimization of ozonated water pretreatment for brown rice before germination based on segmented moisture conditioning method
Accession number: 20165203163272
Authors: Qiu, Shuo (1); Jia, Fuguo (1); Han, Yanlong (1); Jiang, Longwei (1); Zeng, Yong (1)
Author affiliation: (1) College of Engineering, Northeast Agricultural University, Harbin; 150030, China
Corresponding author: Jia, Fuguo(Jiafg301@neau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 271-278
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To increase moisture of brown rice before germination, traditional soaking method provides a suitable environment for the growth of microorganisms, and segmented moisture conditioning method has no proper disinfection technique, which brings potential safety hazard to germinated brown rice. Therefore, an ozonated water treatment technique was proposed to enhance safety of brown rice before and after germination. The segmented moisture conditioned brown rice was selected as raw materials, with Design-Expert 8.0.6 software, a central composite rotatable orthogonal experimental design with four factors and five levels was employed to study effect of brown rice moisture content, initial mass concentration, treatment time and temperature of ozonated water on disinfection rate in aerobic plate count and germination rate of brown rice, and mathematical models for effect of each parameters on disinfection rate in aerobic plate count and germination rate were established. The mathematical models were extremely significant and parameters were optimized to increase disinfection rate in aerobic plate count above 97% and germination rate above 90%, and brown rice moisture content of 27.5%, initial mass concentration, treatment time and temperature of 4.7 mg/L, 6.5 min and 29.5 were decided to be optimal levels. Under this treatment condition, actual disinfection rate in aerobic plate count and germination rate were (97.49±0.11)% and (91.89±0.26)%. Compared with segmented moisture conditioning method without disinfection treatment, germinated brown rice produced with ozonated water treatment technique had significantly reduced amount of aerobic plate counts (P<0.01), and germination rate and γ-aminobutyric acid content were increased by 0.49% and 1.23 mg/(100 g). These verified that ozonated water pretreatment effectively disinfected aerobic plate count and increased germination rate of brown rice, which offered a basis for safety production of germinated brown rice.
Number of references: 26
Main heading: Water treatment
Controlled terms: Amino acids - Cultivation - Disinfection - Moisture - Moisture determination
Uncontrolled terms: Aminobutyric acids - Disinfection treatments - Gamma-aminobutyric acids - Germinated brown rice - Germination rates - Orthogonal experimental design - Ozonated water - Potential safety hazards
Classification code: 445.1 Water Treatment Techniques
Water Treatment Techniques
- 804.1 Organic Compounds
Organic Compounds
- 821.3 Agricultural Methods
Agricultural Methods
- 944.2 Moisture Measurements
Moisture Measurements
Numerical data indexing: Mass 1.00e-01kg, Mass_Density 4.70e-03kg/m3, Percentage 2.75e+01%, Percentage 4.90e-01%, Percentage 9.00e+01%, Percentage 9.70e+01%, Time 3.90e+02s
DOI: 10.6041/j.issn.1000-1298.2016.12.033
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
29. Theoretical analysis and experiment of baling mechanism of roll-disk round baler
Accession number: 20165203163246
Authors: Li, Yelong (1, 2); Wang, Defu (1); Li, Donghong (1); Wang, Mo (1); Jiang, Zhiguo (1); Lei, Junle (1)
Author affiliation: (1) College of Engineering, Northeast Agricultural University, Harbin; 150030, China; (2) Department of Mechanical and Electrical Engineering, Luoding Polytechic, Luoding; 527200, China
Corresponding author: Wang, Defu(dfwang640203@sohu.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 45-52
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: With respect to the collaring jam problem found when harvesting intact rice straw by using domestic small and medium-sized steel-roll round balers, the baling mechanism, which combines the side disk and steel rolls (“the roll-disk type” for short) was designed, and the baling process was experimented by the roll-disk round baler. Through high-speed photography and kinematic analysis, it was found that after being fed to the baling chamber, the intact rice straw can move circumferentially along the steel rolls of baling chamber under the combined effects of steel rolls and side disk; when the rice straw returned to the bottom of baling chamber after running a cycle in the baling chamber, the rice straw would stop rotating due to friction force on two side walls of the baling chamber, then it was continuously accumulated at the bottom of baling chamber; the friction driving force generated by side disk on rice straw can shorten the process of rice straw accumulation to form rotating straw core, which can prevent collaring jam. Based on this, the main factors that affected the formation of rotating straw core in the roll-disk round baler-disk diameter, disk rotation speed and length-width ratio (ratio of rice straw length to width of baling chamber) are chosen as the experimental factors, the rice straw mass when forming rotating straw core was decided as the evaluation index, and then experiments were conducted. The experimental results showed that the sequence of various factors’ influence on the evaluation index was disk diameter, length-width ratio and disk rotation speed. When the disk diameter was 380 mm, disk rotation speed was 135 r/min, length-width ratio was 1.00, rice straw mass when forming rotating straw core was 1.21 kg, and the length-width ratio was 1.26, the rice straw mass when forming rotating straw core was 3.44 kg, and there was no jam occurred. The research results can provide theoretical and technical basis for design of roll-disk round balers and optimization of its operating parameters.
Number of references: 18
Main heading: Rotating disks
Controlled terms: Friction - High speed photography - Steel
Uncontrolled terms: Evaluation index - Experimental factors - Kinematic Analysis - Length-width ratios - Operating parameters - Research results - Round baler - Side disk
Classification code: 545.3 Steel
Steel
- 601.2 Machine Components
Machine Components
- 742.1 Photography
Photography
Numerical data indexing: Mass 1.21e+00kg, Mass 3.44e+00kg, Rotational_Speed 1.35e+02RPM, Size 3.80e-01m
DOI: 10.6041/j.issn.1000-1298.2016.12.007
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
30. Spatial variability of components of corn ear weight in black soil region of Songnen Plain
Accession number: 20165203163261
Authors: Liu, Jilong (1, 2); Ren, Gaoqi (1); Fu, Qiang (1, 2); Ma, Xiaoyi (3); Zhang, Zhenhua (4); Zhou, Yan (1)
Author affiliation: (1) School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin; 150030, China; (2) Collaborative Innovation Center of Grain Production Capacity Improvement in Heilongjiang Province, Harbin; 150030, China; (3) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (4) College of Resources and Environmental Engineering, Ludong University, Yantai; 264025, China
Corresponding author: Fu, Qiang(fuqiang@neau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 178-184 and 222
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Crop information is a comprehensive index and has spatial and temporal variability due to influence of terrain and soil properties and so on. Based on components of corn ear weight (grain weight per ear, axis weight per ear, grain number per ear, row number per ear, grain number per row, ear length and ear diameter) obtained in black soil region of Songnen Plain, the spatial variability of components of corn ear weight was studied with traditional statistics, multifractal and joint multifractal methods. The results showed that spatial variability intensities of grain weight per ear, axis weight per ear, grain number per ear, row number per ear, grain number per row, ear length and ear diameter decreased successively, the ones of grain weight per ear and axis weight per ear were medium, and the ones of grain number per ear, row number per ear, grain number per row, ear length and ear diameter were weak; multifractal characteristics of axis weight per ear and grain weight per ear were the most obvious, the ones of grain number per row, ear diameter and ear length were not obvious, and the ones of row number per ear and grain number per ear were between the above two; spatial variability of row number per ear was caused by its high values, and the local informations that brought about spatial variabilities of grain number per row, axis weight per ear, grain weight per ear, grain number per ear, ear diameter and ear length were their low values; at the single scale and multi-scale, sortings of effect degrees of ear diameter, axis weight per ear, ear length, grain number per ear, grain number per row and row number per ear on spatial variability of grain weight per ear were different, and correlation degrees between grain weight per ear and other components of corn ear weight at multi-scale were bigger than the ones at the single scale. Research results could provide foundational information, scientific basis and guidance for precision management of farmland, increase corn yield in black soil region, and also offer a new angle to study spatial variability of corn yield.
Number of references: 20
Main heading: Grain (agricultural product)
Controlled terms: Fractals - Scales (weighing instruments) - Soils
Uncontrolled terms: Black soil regions - Corn ear weight - Field - Songnen plain - Spatial variability
Classification code: 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 821.4 Agricultural Products
Agricultural Products
- 921 Mathematics
Mathematics
- 943.3 Special Purpose Instruments
Special Purpose Instruments
DOI: 10.6041/j.issn.1000-1298.2016.12.022
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
31. Online measurement of tree canopy volume using vehicle-borne 2-D laser scanning
Accession number: 20165203163277
Authors: Li, Qiujie (1); Zheng, Jiaqiang (1); Zhou, Hongping (1); Zhang, Hao (1); Shu, Yiping (1); Xu, Bo (1)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing; 210037, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 309-314
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: An online measurement method of tree canopy volume using vehicle-borne 2-D laser scanning was proposed. Firstly, the point cloud data of trees was obtained by using a vehicle-borne 2-D laser scanner. After coordinate transformation, trees within the region of interest were detected. Then trunks were recognized by using their vertical distribution characteristic and trunk distances were obtained. In the case of canopy continuity, tree segmentation was performed by finding minimum data frame between trunks. Crown thicknesses were computed by subtracting the crown outer edge distances from the corresponding trunk distance. Finally, tree canopy was discretized into small boxes and its volume was computed by using crown thickness, distance between adjacent measuring points in the vertical direction, vehicle speed and scanning circle. To meet the demand for online measurement, data was saved in FIFO buffer which included all information required for the calculation of tree canopy volume. New data frame was written to the end of the buffer and the processed data frame was read from the beginning of the buffer. The experimental results showed that in the continuous and discontinuous canopy scenarios, trees and trunks were detected effectively and tree canopy volume was measured online accurately. In the experiment, the average processing time per frame was 2.0 ms and the maximum processing time was 15.6 ms, which was less than laser scanning period (25 ms) and met the needs of real-time processing.
Number of references: 20
Main heading: Trees (mathematics)
Controlled terms: Forestry - Image segmentation - Laser applications - Scanning - Surface analysis - Vehicles
Uncontrolled terms: Co-ordinate transformation - Laser scanning - Maximum processing time - On-line measurement - Realtime processing - Tree canopy - Trunk recognition - Vertical distributions
Classification code: 744.9 Laser Applications
Laser Applications
- 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory
Combinatorial Mathematics, Includes Graph Theory, Set Theory
- 951 Materials Science
Materials Science
Numerical data indexing: Time 1.56e+01m/s, Time 2.00e+00m/s, Time 2.50e+01m/s
DOI: 10.6041/j.issn.1000-1298.2016.12.038
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
32. Experiment on steam gasification of pine fuel rods with dolomite catalyst
Accession number: 20165203163269
Authors: Niu, Yonghong (1, 2); Han, Fengtao (2); Zhang, Xuefeng (2, 3); Wang, Li (2); Xu, Jia (2); Chen, Yisheng (2)
Author affiliation: (1) Mining Research Institute, Inner Mongolia University of Science and Technology, Baotou; 014010, China; (2) School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou; 014010, China; (3) Key Laboratory of Integrated Exploitation of Bayan Obo Multi-metal Resources, Baotou; 014010, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 246-252
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Using homemade pine fuel rods as the experimental object, the influence of temperature on dolomite catalytic steam gasification was studied. The results showed that the calcined dolomite can cause long carbon chain cracked, which was conducive to the production of radical hydrogen ion, and helpful to generate hydrogen. Compared with no added catalyst, the volume fraction of H2was increased from 31.91% to 38.82% at 750, increased from 32.32% to 40.11% at 800 and increased from 46.01% to 48.16% at 850. When temperature was less than 850, the volume fraction of CO was reduced due to that the oxidation reaction of carbon monoxide was more dominant than other gasification reaction, and calcined dolomite was easy to absorb CO2. When the gasification temperature was more than 850, because the rate of dolomite catalytic cracking of tar was increased, and the decomposition of carbonates was strengthened with increase of temperature, the rate of increase of CO2volume fraction was higher than the increase of H2and CO volume fractions, which caused the reduction of H2and CO volume fractions (compared with no catalyst added), but the volume fraction of CO was increased. Dolomite catalyst can promote the gradual fracture of the carbon chain of hydrocarbons and make them to be small molecule, such as H2, CO2, CO, etc., and this process was severer with temperature increasing. Dolomite was beneficial to the carbon chain scission reaction, ring opening reaction, decarboxylation reaction, decarboxylation and triple bond cleavage reactions of aromatic hydrocarbons and aliphatic. When temperature was over 850, hydrocarbon chain scission and ring opening reaction with the dolomite catalyzed were increased, making its end chain hydroxylation and gradually formed with terminal methyl dehydration condensation ether, and that rate was higher than the rate of oxidation and removal of hydroxyl and ether chains with temperature increasing. Because under the condition of steam atmosphere, the removal rate of carboxyl group was increased with the increase of temperature, and it was faster than the rate of oxidation of hydroxyl and ether chains to produce carboxyl groups, which caused the integral area of the characteristic peak of carboxyl group increased first and then decreased.
Number of references: 20
Main heading: Atmospheric temperature
Controlled terms: Aromatic hydrocarbons - Calcination - Carbon dioxide - Carbon monoxide - Carboxylation - Catalysis - Catalysts - Catalytic cracking - Chains - Cracks - Ethers - Free radical reactions - Fuels - Gas fuel manufacture - Gasification - Hydrocarbons - Oxidation - Steam - Temperature - Volume fraction
Uncontrolled terms: Catalytic steam gasifications - Characteristic peaks - Decarboxylation reactions - Dolomite - Fuel rods - Gasification reaction - Gasification temperatures - Ring opening reaction
Classification code: 443.1 Atmospheric Properties
Atmospheric Properties
- 522 Gas Fuels
Gas Fuels
- 602.1 Mechanical Drives
Mechanical Drives
- 641.1 Thermodynamics
Thermodynamics
- 802.2 Chemical Reactions
Chemical Reactions
- 802.3 Chemical Operations
Chemical Operations
- 803 Chemical Agents and Basic Industrial Chemicals
Chemical Agents and Basic Industrial Chemicals
- 804 Chemical Products Generally
Chemical Products Generally
Numerical data indexing: Percentage 3.19e+01% to 3.88e+01%, Percentage 3.23e+01% to 4.01e+01%, Percentage 4.60e+01% to 4.82e+01%
DOI: 10.6041/j.issn.1000-1298.2016.12.030
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
33. Influence of nozzle geometry on internal flow characteristics of injection nozzle and near nozzle region injection and atomization
Accession number: 20165203163282
Authors: Gao, Yongqiang (1, 2); Wei, Mingrui (1, 2); Yan, Fuwu (1, 2); Wen, Hua (3)
Author affiliation: (1) Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan; 430070, China; (2) Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan; 430070, China; (3) School of Mechanical and Electrical Engineering, Nanchang University, Nanchang; 330031, China
Corresponding author: Wei, Mingrui(weimingrui@whut.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 347-353
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The presence of cavitation and turbulence in a diesel injector nozzle has significant effects on the subsequent spray characteristics. The influence of nozzle hole shape on internal flow and near-nozzle region fuel injection and atomization under stationary conditions was studied. Five standard-sac nozzles with the same hole inlet diameter but different hole shapes (cylindrical, divergent, convergent, divergent-convergent and convergent-divergent) were used for the investigation of influence of nozzle hole shape on internal flow and spray. Large eddy simulation (LES) along with a two phase homogenous mixture model were employed. From research results, three important conclusions can be drawn. Firstly, the geometry characteristics of the orifice had a great impact on internal flow of injection nozzle. The cavitation can raise the effective velocity at the nozzle exit and strengthen flow disturbance of the nozzles, and such effect became even more obvious with higher injection pressure, e. g., 100MPa. Secondly, the diverging-shaped nozzle was more prone to cavitate, that’s the very opposite of the converging nozzles. Stronger outlet cavitation intensity was found in hyperbolic-shaped nozzles, and stronger inlet cavitation intensity was found in elliptic-shaped nozzles. Thirdly, the cavitation intensity had a great impact on the near-nozzle region fuel break-up and atomization, especially the outlet cavitation such as the diverging-shaped nozzle and hyperbolic-shaped nozzle under the condition of high injection pressure, which were beneficial to the performance of diesel engine, the fuel injection and atomization.
Number of references: 18
Main heading: Spray nozzles
Controlled terms: Atomization - Cavitation - Diesel engines - Fuel injection - Fuels - Large eddy simulation - Nozzles
Uncontrolled terms: Cavitation model - Diesel injector nozzles - Fuel atomization - Geometry characteristics - High injection pressures - Internal flow characteristics - Spray characteristics - Varying hole cross-section
Classification code: 612.2 Diesel Engines
Diesel Engines
- 631 Fluid Flow
Fluid Flow
- 802.3 Chemical Operations
Chemical Operations
- 921 Mathematics
Mathematics
Numerical data indexing: Pressure 1.00e+08Pa
DOI: 10.6041/j.issn.1000-1298.2016.12.043
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
34. Automatic target of indoor spray robot based on image moments
Accession number: 20165203163243
Authors: Zhao, Dongjie (1, 2); Zhang, Bin (1); Wang, Xuelei (1); Guo, Honghong (1, 3); Xu, Songbing (1)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) School of Mechanical and Automobile Engineering, Liaocheng University, Liaocheng; 252000, China; (3) School of Mechatronics, Beijing Union University, Beijing; 100020, China
Corresponding author: Zhang, Bin(zhangbin64@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 22-29
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Automatic target is a key technology in the field of target spray robot. In order to meet the requirements of precision spraying operation for large spacing crops, an automatic target method based on visual feedback was proposed. A hybrid vision structure, including single scene camera and single (or multi) eye-in-hand camera was adopted. The scene camera mounted in the front of robot body was used to pre-locate target crop and estimate robot’s moving speed, and algorithm about location of target crop’s centroid and estimating of robot’s moving speed was studied. The eye-in-hand camera mounted at the end of spray mechanical arm with nozzle was used to track and aim at target crop. A visual tracking method which used image moments as image features was presented, and some important issues, such as moment features selection, image Jacobian calculation and real-time estimation of target depth were studied, and using real-time estimation of target depth would obtain better tracking trajectory than commonly used fixed depth in Cartesian space and image space. Simulation results showed that the visual tracking method can fulfill the target task and had high control precision. In order to further verify the feasibility of the automatic target method, a simplified prototype containing one spray mechanical arm was built and target experiments were carried out in laboratory. The results showed that the position error of nozzle in X, Y and Z directions was less than or equal to 6.5 mm with vehicle speed of 150~200 mm/s. This study can provide reference for the development of target spray robot.
Number of references: 21
Main heading: Target tracking
Controlled terms: Cameras - Crops - Nozzles - Robots - Spray nozzles - Tracking (position) - Visual communication - Visual servoing
Uncontrolled terms: Control precision - Image moments - Key technologies - Moment features - Position errors - Real-time estimation - Tracking trajectory - Visual feedback
Classification code: 631.1 Fluid Flow, General
Fluid Flow, General
- 717.1 Optical Communication Systems
Optical Communication Systems
- 731.5 Robotics
Robotics
- 742.2 Photographic Equipment
Photographic Equipment
- 821.4 Agricultural Products
Agricultural Products
Numerical data indexing: Size 6.50e-03m, Velocity 1.50e-01m/s to 2.00e-01m/s
DOI: 10.6041/j.issn.1000-1298.2016.12.004
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
35. Design of soil moisture sensor based on detection of propagation delay in LVDS differential transmission lines
Accession number: 20165203163278
Authors: Cai, Kun (1, 2); Xu, Xing (1, 2); Yu, Long (1, 2); Yue, Xuejun (1, 2)
Author affiliation: (1) College of Electronic Engineering, South China Agricultural University, Guangzhou; 510642, China; (2) Guangdong Engineering Research Center for Agricultural Information Monitoring, South China Agricultural University, Guangzhou; 510642, China
Corresponding author: Xu, Xing(xuzhexing@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 315-322
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Water in soil is vital for plants. Plants utilize the water absorbed from the soil for transpiration and producing necessary carbohydrates for plant growth. Soil moisture measurement is important to agriculture and gardening. Numerous soil moisture testing methods were researched and developed. These methods can approximately be categorized as dielectric-based methods and non-dielectric methods. The dielectric-based methods are widely used due to their non-destruction, efficiency and accuracy. The proposed method belongs to the dielectric-based methods. Since the dielectric permittivity of water is far larger than that of dehydrated soil, the permittivity of the mixture of water and soil is mainly determined by the quantities of water in soil. Moreover, the permittivity of dielectric material affects propagation speed of electromagnetic waves. The velocity of electromagnetic wave will be decreased when it travels in dielectric material with large permittivity value. The decrease of velocity of electromagnetic waves is highly related to the soil moisture. The proposed sensor provides a method for measuring the deceases of electromagnetic speed. The sensor consists of eight parts, which are a HF oscillator, two high-speed comparators, two LVDS transmitters, a LVDS differential transmission line for test, a LVDS differential transmission line for reference, two LVDS receivers, a phase detection circuit, and a mean-responding power detector. HF oscillator gives a signal to the inputs of two high-speed comparators simultaneously. High-speed comparators convert the HF signal into two TTL logic level signals. These TLL logic level signals are sent to drive two LVDS transmitters, and convert the TTL signal to LVDS differential signal. LVDS signals are leaded into two differential transmission lines. One is for soil moisture test, the other is for reference. The test transmission line is fully contacted with the soil when it is used in applications. The reference transmission line is waterproofed, which provides a reference signal channel for phase detection. Water in soil decreases the speed of electromagnetic wave guided by the test transmission line. LVDS receivers convert the differential signals back into TTL logic level signals. The TTL signals from the LVDS receivers contain the information about decrease of the speed caused by water in soil. Since the speed of electromagnetic wave guided by the test transmission line is slower than that of the electromagnetic wave guided by the reference transmission line, there is a propagation delay between the signals. The phase detector is utilized to extract the delay, which is converted into a voltage signal by the mean-responding power detector. Latosol and yellow earth samples are utilized in the experiments to calibrate the sensor. A gravimetric soil moisture prediction model is built with determination coefficient R2of 0.964 2 and the maximum absolute prediction error is 2.45% when the HF oscillator works at 50 MHz.
Number of references: 28
Main heading: Signal detection
Controlled terms: Circular waveguides - Comparators (optical) - Computer circuits - Dielectric materials - Electric lines - Electric network analysis - Electromagnetic waves - Magnetic materials - Moisture - Moisture control - Moisture determination - Moisture meters - Oscillators (electronic) - Permittivity - Phase comparators - Sensors - Soil moisture - Soil testing - Soils - Speed - Transistor transistor logic circuits - Transmitters
Uncontrolled terms: Determination coefficients - Dielectric permittivities - Differential transmission lines - High speed comparator - Propagation delays - Soil moisture measurement - Soil moisture predictions - Soil moisture sensors
Classification code: 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 703.1.1 Electric Network Analysis
Electric Network Analysis
- 706.2 Electric Power Lines and Equipment
Electric Power Lines and Equipment
- 708.1 Dielectric Materials
Dielectric Materials
- 708.4 Magnetic Materials
Magnetic Materials
- 711 Electromagnetic Waves
Electromagnetic Waves
- 713.2 Oscillators
Oscillators
- 713.5 Electronic Circuits Other Than Amplifiers, Oscillators, Modulators, Limiters, Discriminators or Mixers
Electronic Circuits Other Than Amplifiers, Oscillators, Modulators, Limiters, Discriminators or Mixers
- 714.3 Waveguides
Waveguides
- 716.1 Information Theory and Signal Processing
Information Theory and Signal Processing
- 721.3 Computer Circuits
Computer Circuits
- 741.3 Optical Devices and Systems
Optical Devices and Systems
- 944.1 Moisture Measuring Instruments
Moisture Measuring Instruments
- 944.2 Moisture Measurements
Moisture Measurements
Numerical data indexing: Frequency 5.00e+07Hz, Percentage 2.45e+00%
DOI: 10.6041/j.issn.1000-1298.2016.12.039
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
36. Design and experiment of rear fixed type rolling shutter device in solar greenhouse
Accession number: 20165203163276
Authors: Zhang, Guoxiang (1); Fu, Zetian (1, 2); Li, Xinxing (2, 3); Yan, Jin (2); Yang, Han (2); Zhang, Lingxian (2, 4)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) College of Information and Electrical Engineering, China Agricultural University, Beijing; 100083, China; (3) Beijing Laboratory of Food Quality and Safety, Beijing; 100083, China; (4) Key Laboratory of Agricultural Information Acquisition Technology (Beijing), Ministry of Agriculture, Beijing; 100083, China
Corresponding author: Zhang, Lingxian(zlx131@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 299-308
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Based on the analysis of existing mechanical rolling shutter technology in solar greenhouse, the rear fixed type rolling shutter machine was selected as research object. The existing problems of the machine were analyzed and the solution was found, and the rear fixed type rolling shutter device in solar greenhouse was designed. The device was comprised of four parts of rope traction device, including coiling and uncoiling device, driving device and self-locking device. Besides, the layout scheme of rope traction device and movement mechanism of key devices were analyzed, which included coiling and uncoiling device and reducer. Finally, the designed rear fixed type rolling shutter device was proved, which indicated that it was better than the existed one by contrast experiment and the structure principle of rear fixed type rolling shutter device by test of physical model. According to the data of the test of physical model, the test errors and error source were analyzed. According to the comparison of physical model and actual production situation and calculation of the test data, the performance data of rear fixed type rolling shutter device was proved to be accorded with the performance requirements of the rolling shutter machine in the NY/T 2205-2012 technical specification for quality evaluation of greenhouse rolling shutter machine, which was issued by Ministry of Agriculture in China. The feasibility of the device was further validated. The design and experiment of rear fixed type rolling shutter device in solar greenhouse had improved the applicability of rear fixed type rolling shutter machine, provided technical support for its promotion within a larger scope, facilitated the production of planting crops in solar greenhouse and improved the production benefit.
Number of references: 15
Main heading: Greenhouses
Controlled terms: Agriculture - Design - Locks (fasteners) - Quality control - Rope - Solar heating - Testing
Uncontrolled terms: Coiling and uncoiling device - Contrast experiment - Performance requirements - Physical model test - Rolling shutters - Solar greenhouse - Structure principles - Technical specifications
Classification code: 657.1 Solar Energy and Phenomena
Solar Energy and Phenomena
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
- 821.6 Farm Buildings and Other Structures
Farm Buildings and Other Structures
- 913.3 Quality Assurance and Control
Quality Assurance and Control
DOI: 10.6041/j.issn.1000-1298.2016.12.037
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
37. Layout optimization of ecological nodes based on BCBS model
Accession number: 20165203163280
Authors: Yu, Qiang (1); Yue, Depeng (1); Yang, Di (2); Ma, Huan (1); Zhang, Qibin (1); Yin, Bo (1)
Author affiliation: (1) Beijing Key Laboratory of Precision Forestry, Beijing Forestry University, Beijing; 100083, China; (2) Department of Geography, University of Florida, Gainesville; FL; 32611, United States
Corresponding author: Yue, Depeng(yuedepeng@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 330-336 and 329
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In the arid and semi-arid region in Northwest China, the pattern of ecological land use is an important guarantee to maintain the regional ecological environment security and stability. Ecological network construction is of great significance. Accordingly, based on the typical ecologically vulnerable area-Dengkou county, remote sensing image interpretation data in 2015 is used as research material. The MCR-P model is constructed, and then the ecological sources, corridors and nodes in county scale are extracted. The Voronoi graph model is introduced into the study of layout of ecological nodes. Blind-zone centroid-based scheme model is constructed and ecological node layout is optimized. The results show that totally 391 ecological source nodes and 667 potential ecological nodes are extracted in Dengkou county. The number of nodes that need to be optimized are 182.After optimization, the coverage rate (CR) of ecological nodes is 87.79%, which is increased by 22.56% compared with the current ecological node coverage rate. The node distribution uniformity (U) is reduced to 0.397 8, and the node space distribution is more uniform. After optimization, the covering area of ecological node is 187 003 hm2, and the area of blind area of Tyson polygon is reduced to 117 927 hm2, which is reduced by 48 446 hm2. The structure and node coverage circle space tend to be contiguous, ecological network structure optimization is more stable. The BCBS model constructed by this research can improve the coverage rate of ecological nodes, which is a convenient and efficient method for the layout of regional ecological nodes. This study can provide a scientific basis for construction and management of current and future ecological security pattern.
Number of references: 23
Main heading: Graph theory
Controlled terms: Ecology - Image reconstruction - Land use - Remote sensing - Structural optimization
Uncontrolled terms: Arid and semi-arid regions - Ecological environments - Ecological networks - Ecological node - Ecologically vulnerable areas - P-model - Remote sensing image interpretations - Security and stability
Classification code: 403 Urban and Regional Planning and Development
Urban and Regional Planning and Development
- 454.3 Ecology and Ecosystems
Ecology and Ecosystems
- 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory
Combinatorial Mathematics, Includes Graph Theory, Set Theory
- 921.5 Optimization Techniques
Optimization Techniques
Numerical data indexing: Percentage 2.26e+01%, Percentage 8.78e+01%
DOI: 10.6041/j.issn.1000-1298.2016.12.041
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
38. Kinematics analysis and experiment of apple harvesting robot manipulator with multiple end-effectors
Accession number: 20165203163242
Authors: Li, Guoli (1, 2); Ji, Changying (1); Gu, Baoxing (1); Xu, Weiyue (1); Dong, Mang (1)
Author affiliation: (1) College of Engineering, Nanjing Agricultural University, Nanjing; 210031, China; (2) School of Mechanical and Electronic Engineering, Jinling Institute of Technology, Nanjing; 211169, China
Corresponding author: Ji, Changying(chyji@njau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 14-21 and 29
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to solve the problem of low picking efficiency of single end-effector apple harvesting robot, a structure scheme of multiple end-effectors manipulator was proposed. The mechanical arm, end-effector and manipulator control system were designed. Master-slave two-grade structure was used in the mechanical arm, the multiple end-effectors were linked to forepart of the robot slave mechanical arm, and could operate continuously and simultaneously. The end-effector of the robot had advantages of compact structure and simple drive, which could absorb position error of mechanical arm, and it was universal and suitable for apple, citrus, pears and other spherical fruits picking. According to the characteristics of manipulator with multiple end-effectors, a partitioned fruit tree picking operation strategy was formulated, all the end-effectors picked the target fruits of a picking partition continuously and simultaneously, and the fruits were centrally collected. On this basis, the kinematics mode for robot manipulator was established, the kinematics equations were derived based on the D-H method. The kinematics simulation of the manipulator was conducted using Matlab Robotics Toolbox, the simulation results showed that the kinematics analysis was entirely correct. Based on these, the manipulator physical prototype was manufactured, and the manipulator kinematics and end-effectors picking experiments were carried out under laboratory environment. The results showed that the picking operation strategy was reasonable and feasible, the position error of manipulator end was less than 9 mm, and the picking success rate could reach 82.14%.
Number of references: 26
Main heading: Manipulators
Controlled terms: Citrus fruits - End effectors - Flexible manipulators - Fruits - Harvesting - Industrial robots - Kinematics - MATLAB - Modular robots - Orchards - Robot applications - Robots
Uncontrolled terms: Harvesting robot - Kinematics analysis - Kinematics equation - Kinematics simulation - Laboratory environment - Manipulator control system - Manipulator kinematics - Master slave
Classification code: 731.5 Robotics
Robotics
- 731.6 Robot Applications
Robot Applications
- 821.3 Agricultural Methods
Agricultural Methods
- 821.4 Agricultural Products
Agricultural Products
- 921 Mathematics
Mathematics
- 931.1 Mechanics
Mechanics
Numerical data indexing: Percentage 8.21e+01%, Size 9.00e-03m
DOI: 10.6041/j.issn.1000-1298.2016.12.003
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
39. Master-slave teleoperation based on haptic device tactile shared control
Accession number: 20165203163285
Authors: Ni, Tao (1); Zhu, Houwen (1); Zhang, Hongyan (1); Huang, Lingtao (1); Zheng, Huanfei (1); Gong, Mingde (1)
Author affiliation: (1) College of Mechanical Science and Engineering, Jilin University, Changchun; 130022, China
Corresponding author: Zhang, Hongyan(zhanghy@jlu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 367-372 and 423
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Because of the development limitation of control, sensor and intelligence in robotics, it is hard to fulfill the fully autonomous of robot in the changeable environment immediately. Hence, the master-slave teleoperation is becoming increasingly important in the extreme working environment. The haptic device could work as an interface and fulfill the interactional control between operator and slave working environment. In order to improve the efficiency of the master-slave teleoperation and system security, a haptic device was designed to achieve master-slave displacement control. The kinematics and dynamics property of the designed structure was analyzed, the parameters of the device were instantiated, and the rationality of the design was estimated. Active control mode was established based on virtual wall guide, through the fusion of operator’s manipulation and robotic visual guidance, information sharing and mutual guidance were realized in the teleoperation. Experiments were conducted by using a haptic device-robot system experimental platform. Compared with the trajectory of manual mode, the trajectory of active mode was smoother and more stable. Through the evaluation of haptic device’s real performance, the active control mode could ensure the stability of robot under the master-slave control. The effectiveness of the control method was verified by the experiments. Finally, the efficiency improvement of master-slave teleoperation, impact reduction of robot on environment and security improvement of the system were achieved.
Number of references: 17
Main heading: Haptic interfaces
Controlled terms: Efficiency - Intelligent robots - Remote control - Robotics - Robots
Uncontrolled terms: Admittance control - Haptic devices - Master slave - Shared control - Virtual forces
Classification code: 722.2 Computer Peripheral Equipment
Computer Peripheral Equipment
- 731 Automatic Control Principles and Applications
Automatic Control Principles and Applications
- 913.1 Production Engineering
Production Engineering
DOI: 10.6041/j.issn.1000-1298.2016.12.046
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
40. Revised detection and localization algorithm for camellia oleifera fruits based on convex hull theory
Accession number: 20165203163274
Authors: Li, Lijun (1); Yang, Hanjiang (1)
Author affiliation: (1) School of Mechanical and Electrical Engineering, Central South University of Forestry and Technology, Changsha; 410000, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 285-292 and 346
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The existing method based on convex hull theory has low detecting ratio and large locating error because of failing to extract effective contour of the concave regions for occluded fruits. In order to improve recognition accuracy and reduce error of the current method, a kind of improved algorithm for detecting and locating occluded Camellia oleifera fruits was proposed. Firstly, in order to get a grayscale image of occluded Camellia oleifera fruits, different color spaces of the original image were compared and then R-B chromatic aberration characteristic was chosen. The Otsu method was used to segment the grayscale image and the morphological operation was employed to remove residual noise, thus the regions of targets and backgrounds can be successfully separated by the algorithm. A kind of algorithm was used to extracte convex closure of each occluded regions and then the concave regions were obtained by subtracting the binary image from its convex closure image. The regions with pixels less than half of the biggest one in concave image were removed and the intersection points or concave points of occluded Camellia oleifera fruits were detected by a kind of concave point detection algorithm, then the occluded targets were separated by using Bresenham line drawing algorithm according to the intersection points. Convex closure of each separated regions was built and convex hull was extracted from it, after that a kind of ineffective contour removing algorithm was used to extracte effective contour that used to reconstruct the target contour from each convex hull. Contour reconstruction algorithm was used to rebuild the target contour of the occluded Camellia oleifera fruits based on the points of each corresponding effective contour, and then the reconstruction contour was merged that the distance between their centers was below the threshold value. In order to validate the performance of the improved algorithm, a comparative test was conducted, and the positioning errors were calculated. The test results showed that it needed 0.491 s to finish the recognition and location process in average by the proposed method, which accounted for only 2.46% of the total time-consuming for a single Camellia oleifera fruit by harvesting robot. Average recognition success rate of occluded Camellia oleifera fruits by the proposed method was 93.21%, which was 7.47 percentage points higher than that of the original method. Average segmentation error of the proposed method was 5.53%, which was reduced by 6.22 percentage points compared with that of the original method. Average overlap ratio of the proposed method was 93.43%, which was 6.79 percentage points less than the that of the traditional method. The test results indicated that the proposed method was feasible and effective to recognize and locate occluded Camellia oleifera fruits.
Number of references: 22
Main heading: Image processing
Controlled terms: Aberrations - Binary images - Computational geometry - Errors - Face recognition - Fruits - Image segmentation - Location - Mathematical morphology
Uncontrolled terms: Bresenham line drawing algorithm - Camellia oleifera fruits - Chromatic aberration characteristics - Concave points - Contour reconstruction - Convex hull - Detection and localization - Point detection algorithm
Classification code: 723.2 Data Processing and Image Processing
Data Processing and Image Processing
- 723.5 Computer Applications
Computer Applications
- 821.4 Agricultural Products
Agricultural Products
Numerical data indexing: Percentage 2.46e+00%, Percentage 5.53e+00%, Percentage 9.32e+01%, Percentage 9.34e+01%
DOI: 10.6041/j.issn.1000-1298.2016.12.035
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
41. Structural characteristics and kinematic analysis for novel 2RRUR-2RSS parallel mechanism
Accession number: 20165203162991
Authors: Zhu, Xiaorong (1); Song, Yueyue (1); Sun, Chen (1); Shen, Huiping (1); Yang, Tingli (1)
Author affiliation: (1) School of Mechanical Engineering, Changzhou University, Changzhou; 213164, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 408-415
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A new non-overstrained four-DOF parallel kinematic mechanism (PKM) for realizing three-dimensional translations and rotation is presented, which is composed only with revolute joints. The topological structure characteristics, such as the POC set of moving platform, mobility and the mechanism coupling degree, are first obtained based on the design theory of position and orientation characteristic (POC) set. By means of the D-H matrix, the kinematic inverse equations of the PKM are established and Jacobian matrix, singularity are subsequently derived and analyzed. The virtual mechanism is modeled and the kinematics is simulated by using Pro/E software. By comparing the theoretical calculation analysis of examples with the results derived from simulation, the inverse positional solutions are proved to be correct. Based on the kinematic inverse equations, the 3D boundary search method is used to describe the geometrical feature and cross section of constant orientation workspace. Furthermore, the distribution of singularity position is presented and the rotational capacity among the workspace is evaluated. The results show that the workspace has regular geometrical shape and the rotational capacity is satisfactory, but the singular may appear in the workspace. Hence, it is necessary to obtain the singularity-free workspace of the PKM, which can guarantee the mechanism to avoid singularities. The study has guiding significance and reference value to the design and control of this kind of PKM.
Number of references: 18
Main heading: Kinematics
Controlled terms: Inverse problems - Jacobian matrices - Matrix algebra - Mechanisms - Steel beams and girders
Uncontrolled terms: Parallel kinematic mechanisms - Position inverse solution - Rotational capacity - Singularity loci - Structural characteristics - Workspace
Classification code: 408.2 Structural Members and Shapes
Structural Members and Shapes
- 601.3 Mechanisms
Mechanisms
- 921.1 Algebra
Algebra
- 931.1 Mechanics
Mechanics
DOI: 10.6041/j.issn.1000-1298.2016.12.052
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
42. Impacts of biochar on major forms contents and conservation mechanism of nitrogen during aerobic composting of chicken manure
Accession number: 20165203163267
Authors: Liu, Ning (1); Zhou, Jialiang (1); Ma, Shuangshuang (1); Han, Lujia (1); Huang, Guangqun (1)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China
Corresponding author: Huang, Guangqun(huangguangqun@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 233-239
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: It is of great significance to investigate the impacts of biochar on the quantity of major nitrogen forms and conservation mechanism of nitrogen during aerobic composting of chicken manure, which could provide some theoretical supports for future study on NH3emission, nitrogen loss, and composting process optimization. Chicken manure and wheat straw were used as primary materials, and proper amount of biochar was added to conduct aerobic composting with an intelligent aerobic composting reactor system. Based on the physicochemical and biological indicators and dynamic data of major nitrogen forms, combined with analysis of scanning electron microscopy and the quantity variation of main microbial communities, the quantity variation of major nitrogen forms was studied and the conservation mechanism of nitrogen was illustrated. Conclusions were drawn as follows: adding proper amount of biochar could yield less NH3emission and nitrogen loss; there were significant positive correlation between NH4+-N concentration and NH3emission (r=0.783, p=0.0373--N concentrationand NH3emission (r=-0.941, p=0.0173and NH4+-N, reduce NH4+-N concentration in the pile, and thus reduce the NH3emission effectively. In addition, biochar could provide appropriate refuge for nitrifying bacteria, promote the nitration reaction, and then inhibit NH3volatilization.
Number of references: 26
Main heading: Nitrogen
Controlled terms: Animals - Bacteria - Fertilizers - Manures - Nitration - Nitrification - Optimization - Piles - Scanning electron microscopy
Uncontrolled terms: Aerobic composting - Bio chars - Biological indicators - Chicken manure - Microbial communities - Negative correlation - Nitration reactions - Positive correlations
Classification code: 408.2 Structural Members and Shapes
Structural Members and Shapes
- 802.2 Chemical Reactions
Chemical Reactions
- 804 Chemical Products Generally
Chemical Products Generally
- 821.5 Agricultural Wastes
Agricultural Wastes
- 921.5 Optimization Techniques
Optimization Techniques
DOI: 10.6041/j.issn.1000-1298.2016.12.028
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
43. Responses of growth, physiological and evapotranspiration characteristics of columnar apple trees to different irrigation depths
Accession number: 20165203163265
Authors: Wu, You (1); Zhang, Fucang (1, 2); Yan, Shicheng (1, 2); Xiang, Youzhen (1, 2); Zou, Haiyang (1, 2); Tian, Jianke (1, 2)
Author affiliation: (1) Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling; Shaanxi; 712100, China
Corresponding author: Zhang, Fucang(zhangfc@nwsuaf.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 213-222
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Considering the soil water deficit and low water use efficiency of apple orchards in the semi-arid areas of Northwest China, the effects of mulching and water supply on growth, physiological properties and evapotranspiration features of columnar apple trees were investigated to explore suitable irrigation depth and soil water conservation measures for healthy growth and higher water use efficiency of apple trees. The weighing bucket experiments under a shelter were subjected to four irrigation water levels: 60%ETC(W1), 80%ETC(W2), 100%ETC(W3) and 120%ETC(W4), and two mulching modes: mulching (M) and no mulching (NM), resulting in eight treatments in total. The results showed that dry matter was increased with the increase of irrigation amount, and the M treatment promoted accumulation of dry matter. Net photosynthetic rate (Pn), transpiration rate (Tr) and stomatal conductance (Gs) were increased with the increase of irrigation depth. Pnand Trat different growth stages under different irrigation depths and mulching modes showed a decreasing trend as fruit enlargement stage, fruit maturation stage, flowering and fruit bearing stage and leaf changing stage. Under the same irrigation depth and mulching mode, Pn, Trand Gsat different times in a day showed a decreasing trend as 10: 00, 13: 00 and 8: 00, 13: 00, 10: 00 and 08: 00, and 10: 00, 08: 00 and 13: 00, respectively. The maximum and minimum leaf water use efficiency (LWUE) found at 10: 00 in the MW2 treatment (4.52 μmol/mmol) and at 13: 00 in the MW4 treatment (2.62 μmol/mmol), respectively. The accumulative evapotranspiration during the whole growth period was increased with the increase of irrigation depth, those of NM treatments were increased by 11.02%~16.35% compared with those of M treatments. Water consumption rate at flowering and fruit bearing stage, fruit enlargement stage, fruit maturation stage and leaf changing stage reached 3.29~4.36 mm/d, 2.40~4.85 mm/d, 0.83~1.79 mm/d and 0.77~1.53 mm/d, with the corresponding water consumption modulus of 19.34~27.40%, 55.99~61.41%, 8.62%~12.63% and 5.85%~7.24%, respectively. The results indicated that the W4 and M treatments were beneficial for improving the growth and physiological characteristics of columnar apple trees, but the highest water use efficiency was obtained in the W2 treatment. Fruit enlargement stage was found to be the most active physiological metabolic reaction stage of columnar apple trees, and mulching played a certain role in the soil water conservation.
Number of references: 42
Main heading: Fruits
Controlled terms: Efficiency - Evapotranspiration - Forestry - Irrigation - Physiological models - Physiology - Plants (botany) - Soil conservation - Soil moisture - Soils - Transpiration - Water conservation - Water levels - Water resources - Water supply
Uncontrolled terms: Apple trees - Different growth stages - Net photosynthetic rate - Physiological characteristics - Physiological properties - Soil-water conservation - Transpiration rates - Water use efficiency
Classification code: 444 Water Resources
Water Resources
- 446.1 Water Supply Systems
Water Supply Systems
- 461.9 Biology
Biology
- 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 821.3 Agricultural Methods
Agricultural Methods
- 821.4 Agricultural Products
Agricultural Products
- 913.1 Production Engineering
Production Engineering
Numerical data indexing: Percentage 1.93e+01% to 2.74e+01%, Percentage 5.60e+01% to 6.14e+01%
DOI: 10.6041/j.issn.1000-1298.2016.12.026
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
44. Effects of different mulching patterns on soil moisture, soil temperature and summer maize growth
Accession number: 20165203163263
Authors: Feng, Hao (1, 2); Liu, Xia (1, 3); Yu, Kun (1, 3); Ding, Dianyuan (1, 3); Zhang, Haojie (1, 3); Chu, Xiaosheng (1, 3)
Author affiliation: (1) Chinese National Academy of Water-saving Agriculture in Arid Region, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Institute of Water and Soil Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling; Shaanxi; 712100, China; (3) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 192-202
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The influence of different field mulching treatments on soil water content, soil temperature, crop growth, final yield and water use efficiency was studied during the summer maize growing season in the semi-humid region of Northwest China. The mulching treatments included the flat plot with straw mulching (SM), flat plot with plastic film mulching (PM), ridge-furrow planting with film mulching over ridge and wheat straw mulching over furrow (SPM), and flat plot without mulching (control treatment, CK). The results showed that water content of mulching treatments in soil layer of 0~260 cm depth was significantly larger than that of CK during maize growing period (P<0.05). The average soil temperature in the soil layer of 0~30 cm depth showed a decreasing trend of PM, SPM, CK and SM, and the average soil temperature of CK was larger than that of SPM when the soil layer was 0~15 cm depth. The development of maize aboveground biomass can match well with the logistic curve. Moreover, the average yields of SM, PM and SPM in the two-year experiment were increased by 15.4%, 23.3% and 28.4% compared with that of CK, respectively (P<0.05). The water use efficiencies of SM, PM and SPM were increased by 10.2%, 31.2% and 28.0% compared with that of CK, respectively (P<0.05). By comparison, the SPM can collect rainwater more effectively than other treatments and had the largest aboveground biomass in theory. In the treatment of SPM, the rapid dry matter accumulation period was earlier, and the cumulative rate was the fastest with a longer accumulation period, which meant that the SPM can significantly improve the soil water-heat conditions, increase the accumulation amount of crop dry matter, promote crop growth and improve water use efficiency. Therefore, the SPM was the better choice for local farmers in the semi-humid region of Northwest China.
Number of references: 44
Main heading: Soils
Controlled terms: Crops - Ecology - Efficiency - Soil moisture - Temperature - Water content
Uncontrolled terms: Mulching - Soil water - Summer maize - Water use efficiency - Yield
Classification code: 454.3 Ecology and Ecosystems
Ecology and Ecosystems
- 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 641.1 Thermodynamics
Thermodynamics
- 821.4 Agricultural Products
Agricultural Products
- 913.1 Production Engineering
Production Engineering
Numerical data indexing: Percentage 1.02e+01%, Percentage 1.54e+01%, Percentage 2.33e+01%, Percentage 2.80e+01%, Percentage 2.84e+01%, Percentage 3.12e+01%, Size 0.00e+00m to 1.50e-01m, Size 0.00e+00m to 2.60e+00m, Size 0.00e+00m to 3.00e-01m
DOI: 10.6041/j.issn.1000-1298.2016.12.024
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
45. Experiment on pressure fluctuation in mixed-flow pump under different flow rate conditions
Accession number: 20165203163249
Authors: Li, Wei (1); Ji, Leilei (1); Shi, Weidong (1); Zhou, Ling (1); Ping, Yuanfeng (1)
Author affiliation: (1) Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang; 212013, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 70-76
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to study the pressure fluctuation characteristics in the mixed-flow pump caused by the effect of impeller and guide vane’s unsteady periodical interference, the pressure fluctuation in key monitoring points was measured on the mixed-flow pump body. The time domain and frequency domain responses of the pressure fluctuation under different flow rate conditions on the impeller inlet, middle part of impeller, impeller outlet, guide vane inlet, guide vane outlet and device exit were analyzed. The results showed that the impeller rotational cycle greatly influenced the pressure fluctuation at the positions of the impeller inlet and the blade rim central point of the impeller. The four peaks and four valleys were appeared in the fluctuation curves which were consistent with the number of impeller blades. Meanwhile, the main pressure fluctuation frequency was consistent with the impeller blade passing frequency. The pressure fluctuations appeared 7~12 peaks and valleys respectively in impeller outlet monitoring points and guide vane inlet monitoring points under small flow rate condition, which was caused by the rotor-stator interaction between impeller and guide vane. Besides, due to the rotor-stator interaction, the pressure fluctuation spectrum range became larger and frequency component was increased. The main frequency was shifted to high frequency with the decrease of flow rate. The fluid vibration induced by dynamic and static interference and the noise of high frequency composition was increased gradually. The pressure fluctuation amplitude of the monitoring points in the center of the impeller was the largest and the most sensitive to the change of flow rate, the pressure fluctuation of the monitoring points away from the impeller area was less affected by the change of flow rate. The research results had significant reference value for revealing the unsteady flow characteristics of mixed-flow pump.
Number of references: 23
Main heading: Impellers
Controlled terms: Axial flow - Experiments - Flow measurement - Flow rate - Frequency domain analysis - Rotors - Stators
Uncontrolled terms: Flow rate conditions - Frequency components - Frequency domain response - Mixed flow pump - Pressure fluctuation - Rotor-stator interactions - Static interference - Unsteady flow characteristics
Classification code: 601.2 Machine Components
Machine Components
- 631 Fluid Flow
Fluid Flow
- 631.1 Fluid Flow, General
Fluid Flow, General
- 705.1 Electric Machinery, General
Electric Machinery, General
- 901.3 Engineering Research
Engineering Research
- 921.3 Mathematical Transformations
Mathematical Transformations
DOI: 10.6041/j.issn.1000-1298.2016.12.010
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
46. Dynamic characteristic of metal pushing belt-planetary gear continuously variable transmission
Accession number: 20165203163289
Authors: Wang, Zhen (1, 2); Cui, Yahui (1); Liu, Kai (1); Xu, Lin (1)
Author affiliation: (1) College Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an; 710048, China; (2) College of Energy Engineering, Yulin University, Yulin; 719000, China
Corresponding author: Cui, Yahui(cyhxut@xaut.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 391-397 and 384
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A metal pushing belt-planetary gear continuously variable transmission (CVT) was presented. It permitted to enlarge the ratio spread of the CVT and simultaneously ensured a better transmission efficiency. The XP type single loop system with a clockwise power circulation was selected. A metal pushing belt-planetary gear CVT was designed. Its transmission ratio was ranged from 0.5 to 3, the circulation power was less than 33% of the system input power. The metal pushing belt CVT and the XP type with clockwise power circulation CVT efficiency characteristics were contrasted. Through mode switching, the metal pushing belt-planetary gear CVT could effectively optimize the transmission efficiency. Taking Matlab/Simulink as a platform, the simulation model of the vehicle was established. Given UDDS driving cycles, using the best fuel economy control strategy for the engine, the simulation results showed that throughout UDDS driving cycle, at low speed and high torque, the operating mode was the clockwise power circulation pattern; at high speed, the operating mode was CVT pattern, the metal pushing belt-planetary gear CVT can reconcile transmission ratio range and transmission efficiency. During mode switch, the power flow direction of the continuously variable branch was invariable, which effectively prevented the system vibration.
Number of references: 20
Main heading: Electric power transmission
Controlled terms: Clocks - Efficiency - Electric load flow - Fuel economy - MATLAB - Metals - Variable speed transmissions - Vibrations (mechanical)
Uncontrolled terms: Continuously variable transmission - Dynamic characteristics - Mode switches - Planetary Gears - Power circulation - Transmission efficiency - Transmission ratios - Vibration
Classification code: 525.2 Energy Conservation
Energy Conservation
- 602.2 Mechanical Transmissions
Mechanical Transmissions
- 706.1 Electric Power Systems
Electric Power Systems
- 706.1.1 Electric Power Transmission
Electric Power Transmission
- 913.1 Production Engineering
Production Engineering
- 921 Mathematics
Mathematics
- 931.1 Mechanics
Mechanics
- 943.3 Special Purpose Instruments
Special Purpose Instruments
Numerical data indexing: Percentage 3.30e+01%
DOI: 10.6041/j.issn.1000-1298.2016.12.050
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
47. Soil erosion resistance under dry-wet alternation in different layers of dry-hot valley region
Accession number: 20165203163258
Authors: Zhang, Su (1); Xiong, Donghong (1); Zhang, Baojun (1); Yang, Dan (1); Xiao, Liang (1); Fang, Haidong (2)
Author affiliation: (1) Key Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu; 610041, China; (2) Institute of Tropical Eco-agriculture, Yunnan Academy of Agricultural Sciences, Yuanmou; 651300, China
Corresponding author: Xiong, Donghong(dhxiong@imde.ac.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 152-159 and 212
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Gullies are well developed in Yuanmou dry-hot valley region of Southwest China, which result in intense soil erosion and severe land gradation. And local climate and soil properties are two of the main factors controlling gully erosion in this area. The frequent dry-wet alternations occurred in soil are the essential process of gully erosion. Six typical soil layers in the study area are chosen(from top to bottom are as follows: layers I, II, III, IV, V and VI) to analyze the characteristics and differences of soil erosion resistance by implementing in situ experiments of dry-wet alternation, in which soil shear strength, soil anti-scourability and soil disintegration indices are selected as the main measuring and evaluation indicators. Research results show that the values of soil shear strength of the six soil layers are apparently different, among which those of layer IV and layer V are greater than those of other layers. With the increase of cycles of dry-wet alternation, the internal friction angle shows a fluctuating and irregular trend, while the cohesive force presents significantly negative correlation relationship in the same layer. The difference for the values of soil anti-scourability is significant among the six soil layers, and the values of layer III and layer VI are relatively smaller than those of other layers. During the dry-wet alternation, the soil detachment rate shows a fluctuating and gradual decreasing trend and the soil anti-scourability is increased with the times of dry-wet alternations in the same layer. The average soil disintegration rates of all layers appear distinct liner correlations with the times of dry-wet alternations, among which those of layer III and layer VI are relatively greater and layer IV and layer V are smaller, while layer I and layer II are intermediate between the former groups. Furthermore, with the feature of soft rock formations alternate with hard ones, the soil layers show an trend of firstly decreasing, and then increasing and finally decreasing for its soil erosion resistance in the vertical direction. The above results contribute to revealing gully development processes from the perspective of soil erosion.
Number of references: 28
Main heading: Shear strength
Controlled terms: Erosion - Landforms - Soils
Uncontrolled terms: Different soils - Dry-hot valleys - Evaluation indicators - Gully - In-situ experiments - Internal friction angle - Negative correlation - Soil erosion
Classification code: 481.1 Geology
Geology
- 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
DOI: 10.6041/j.issn.1000-1298.2016.12.019
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
48. Design optimization and experimental analysis of bidirectional shaft tubular pump device
Accession number: 20165203163251
Authors: Shi, Lijian (1); Liu, Xinquan (2); Tang, Fangping (1); Yao, Yueling (3); Xie, Rongsheng (1); Zhang, Wenpeng (1)
Author affiliation: (1) School of Hydraulic Energy and Power Engineering, Yangzhou University, Yangzhou; 225100, China; (2) Jiangsu Surveying and Design Institute of Water Resources Co., Ltd., Yangzhou; 225100, China; (3) Department of Engineering and Economic Management, Zhejiang Tongji Vocational College of Science and Technology, Hangzhou; 311231, China
Corresponding author: Tang, Fangping(tangfp@yzu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 85-91
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To explore hydraulic design method and improve optimization type of the bidirectional shaft passage, the design optimization research of inside and outside line and bifurcation segment type of the bidirectional shaft passage was done. Based on the standard k-Ε turbulence model and the Reynolds averaged N-S equation, and combined Longshan hydraulic project, the bidirectional shaft tubular pump device was optimized and designed by using CFD software. The hydraulic loss and velocity distribution in different shaft outlet conduit schemes were calculated and compared, and the different segments hydraulic loss distribution of different shaft outlet conduit schemes was revealed. Finally, combined with the model test results, the reliability of the optimization design of bidirectional shaft flow passage was confirmed. Optimization results showed that the shaft bifurcated segment design directly determined the hydraulic loss of the latter part shaft passage. Through adjusting the shaft inner and outer contour lines, the hydraulic loss of the shaft outlet conduit can be effectively reduced, and the tubular pump device hydraulic characteristics were enhanced. The efficiency curve of the optimized scheme was high, the range of the high efficiency area was wider than that of the initial scheme, and the lift curve was also slightly higher than that of the initial scheme. After optimization, the maximum reverse operation efficiency of the shaft tubular pump system was up to 60.5%, which was increased by 3.8 percentage points compared with the prior optimization, and the forward operation efficiency was 72.18%, which was improved by 1.67 percentage points. The highest efficiency of reverse operation and forward operation model test was 57.56% and 72.67%, respectively. The research would provide guidance for design optimization of low head bidirectional tubular pump device.
Number of references: 20
Main heading: Curve fitting
Controlled terms: Computational fluid dynamics - Design - Efficiency - Navier Stokes equations - Pumps - Turbulence models
Uncontrolled terms: Design optimization - Experimental analysis - Hydraulic characteristic - Hydraulic loss distributions - Numerical calculation - Operation efficiencies - Shaft passage - Shaft tubular pump systems
Classification code: 618.2 Pumps
Pumps
- 723.5 Computer Applications
Computer Applications
- 913.1 Production Engineering
Production Engineering
- 921.2 Calculus
Calculus
- 921.6 Numerical Methods
Numerical Methods
Numerical data indexing: Percentage 5.76e+01%, Percentage 6.05e+01%, Percentage 7.22e+01%, Percentage 7.27e+01%
DOI: 10.6041/j.issn.1000-1298.2016.12.012
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
49. Modified interphase drag model for diluted solid-liquid two-phase flow
Accession number: 20165203163252
Authors: Zhang, Zichao (1); Wang, Fujun (1, 2); Chen, Xin (1, 2); Xiao, Ruofu (1, 2); Yao, Zhifeng (1, 2)
Author affiliation: (1) College of Water Resources and Civil Engineering, China Agricultural University, Beijing; 100083, China; (2) Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, Beijing; 100083, China
Corresponding author: Wang, Fujun(wangfj@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 92-98 and 270
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The interphase drag for diluted solid-liquid two-phase flow is important for solid volume concentration calculation. The Wen-Yu drag model is widely used in solid-liquid two-phase flow numerical simulation. However, the drag coefficient in Wen-Yu drag model was obtained by adding concentration variable to standard drag coefficient curve, and the influence of fluid turbulence on drag coefficient was ignored. Thus, the influence of fluid turbulence on drag coefficient was considered. The inertia factor and turbulence factor were introduced to describe influence of inertia term and turbulence intensity on drag coefficient respectively for diluted solid-liquid two-phase flow, since the influence was caused by inertia effect and turbulence effect. According to experimental and theoretical investigations, a formula form between turbulence modified function and the two factors was proposed. The constant coefficients in the correlation were determined by the least square method using experimental data, then the relation between turbulence modified function and particle Reynolds number, turbulence intensity was obtained. The turbulence modified function was then used to modify Wen-Yu model. A two-phase flow simulation was conducted in a circular tube with modified Wen-Yu model. By comparison with Wen-Yu model, the results showed that the computed solid concentration distributions of modified Wen-Yu model were agreed well with experimental data at different inlet fluid velocities.
Number of references: 26
Main heading: Two phase flow
Controlled terms: Drag - Drag coefficient - Fluids - Least squares approximations - Liquids - Reynolds number - Turbulence
Uncontrolled terms: Constant coefficients - Least square methods - Modified function - Particle Reynolds number - Solid concentration distribution - Solid concentrations - Solid-liquid two phase flows - Theoretical investigations
Classification code: 631.1 Fluid Flow, General
Fluid Flow, General
- 921.6 Numerical Methods
Numerical Methods
DOI: 10.6041/j.issn.1000-1298.2016.12.013
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
50. Effect of regulated deficit irrigation on uptake and utilization of nitrogen, phosphorus and potassium for winter wheat
Accession number: 20165203163264
Authors: Meng, Zhaojiang (1, 2); Duan, Aiwang (1, 2); Gao, Yang (1, 2); Wang, Xiaosen (1, 2); Shen, Xiaojun (1, 2); Chang, Xiao (1, 2)
Author affiliation: (1) Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang; 453002, China; (2) Key and Open Laboratory of Crop Water Requirements Regulation, Ministry of Agriculture, Xinxiang; 453002, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 203-212
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A better understanding of the effects of irrigation model on soil nutrients is important to agronomists and farmers for developing management packages with high-yield, good-quality and low water and fertilizer applications. A pot-based experiment with winter wheat cultivar (Triticum aestivum L.) was conducted under rainproof shelter during the growing seasons of 2012-2013 and 2013-2014 to investigate the effects of regulated deficit irrigation (RDI) on nitrogen, phosphorus and potassium uptake and utilizations in Xinxiang City of Henan Province, in the Huang-Huai-Hai Plain of China. The experimental treatments included five growth stages (I, three leaves-winter; II, winter-beginning of spring growth; III, beginning of spring growth-stem elongation; IV, stem elongation-ear emergence and V, ear emergence-maturity) and three levels of water deficit (60%~65% FC (field capacity), 50%~55% FC, and 40%~45% FC for light, moderate, and severe deficit, respectively) were laid out in a randomised complete block design with three replicates. A non-deficit control (CK) (75%~85% FC from sowing to maturity) with three replications was also included. The results indicated that light or moderate water deficit at winter-beginning of spring growth stage benefited nutrients translocation and distribution in the grains, and excess of water in the soil or inapplicable water deficit resulted in increase of proportion of nutrients accumulation in vegetative organs. Appropriate water deficit (50%~55% FC) during ear emergence-filling stage was able to increase nitrogen and phosphorus contents in grains, and then increase grain yield and improve quality. Light water deficit or moderate water deficit during beginning of spring growth-stem elongation stage was favorable to improve nitrogen and phosphorus use efficiencies, but water deficit at any stages was unfavorable to increase potassium use efficiency. The results also showed that appropriate water deficit (especially light water deficit at winter stage or moderate water deficit at stem elongation stage) significantly enhanced nitrogen absorption ability of plants from soil, and reduced nitrogen residue in soil. Therefore, it was suggested that RDI can effectively regulate nitrogen, phosphorus and potassium uptake, and promote water and fertilizer savings, high yield, good quality and high efficiency of winter wheat.
Number of references: 25
Main heading: Water absorption
Controlled terms: Crops - Efficiency - Elongation - Fertilizers - Forestry - Grain (agricultural product) - Irrigation - Nitrogen - Nitrogen fertilizers - Nutrients - Phosphorus - Plants (botany) - Potassium - Soils
Uncontrolled terms: Fertilizer applications - Nitrogen absorption - Nitrogen and phosphorus - Nutrient-use efficiencies - Nutrients accumulations - Regulated deficit irrigation - Vegetative organs - Winter wheat
Classification code: 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 549.1 Alkali Metals
Alkali Metals
- 802.3 Chemical Operations
Chemical Operations
- 804 Chemical Products Generally
Chemical Products Generally
- 821.3 Agricultural Methods
Agricultural Methods
- 821.4 Agricultural Products
Agricultural Products
- 913.1 Production Engineering
Production Engineering
DOI: 10.6041/j.issn.1000-1298.2016.12.025
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
51. Design and experiment on potted-seedling automatic transplanter control system for motion coordinating
Accession number: 20165203163240
Authors: Wei, Xinhua (1); Bao, Sheng (1); Liu, Xiaokai (1); Liu, Chengliang (2); Mao, Hanping (1)
Author affiliation: (1) Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang; 212013, China; (2) School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai; 200240, China
Corresponding author: Mao, Hanping(maohp@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 1-7 and 52
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to achieve the separation of three different motion driving systems, which are seedling fetching, plant moving and seedling planting on potted-seedling automatic transplanter, simplify the mechanical transmission system structure, and improve the reliability and quality of operations, a potted-seedling automatic transplanter control system for motion coordinating was designed based on PLC. This system accomplishes synchronous coordination of seedling disk lateral feeding motion driving by stepper motor, seedling fetching manipulator longitudinal reciprocating motion driving by servo motor, control of pneumatic perpendicular fetching/casting seedling motion of seedling fetching manipulator and pneumatic feeding seedling motion, and mechanical driving planting motion, which simplifies the mechanical transmission system, at the same time, further raises the positioning precision of the seedling fetching and the seedling moving flexibility, reduces the loss of the seedling matrix and improves the transplanting effect. The working principle of potted-seedling automatic transplanter is expounded, the design of hardware system and software system of the motion coordination control system is discussed in detail, and the actual transplanting test is carried out. Experimental results show that under the control of motion coordination control system, potted-seedling automatic transplanter can achieve 40 strains/(min·row) fetching/casting seedling rate, at the overall single row transplanting average rate of 39.9 strains/min, prototype completes fetching/casting seedling process, ultimately, the success rate of feeding seedlings into planting device is 96.9%.
Number of references: 21
Main heading: Quality control
Controlled terms: Control systems - Feeding - Manipulators - Motion planning - Pneumatics - Programmable logic controllers - Seed - Software testing - Stepping motors - Transmissions
Uncontrolled terms: Coordination control - Design of hardwares - Mechanical transmission system - Motion coordination - Positioning control - Positioning precision - Potted seedling - Reciprocating motion
Classification code: 602.2 Mechanical Transmissions
Mechanical Transmissions
- 632.3 Pneumatics
Pneumatics
- 691.2 Materials Handling Methods
Materials Handling Methods
- 705.3 Electric Motors
Electric Motors
- 723.5 Computer Applications
Computer Applications
- 731.1 Control Systems
Control Systems
- 732.1 Control Equipment
Control Equipment
- 821.4 Agricultural Products
Agricultural Products
- 913.3 Quality Assurance and Control
Quality Assurance and Control
Numerical data indexing: Percentage 9.69e+01%
DOI: 10.6041/j.issn.1000-1298.2016.12.001
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
52. Automatic following system for greenhouse harvesting transportation based on adaptive pure pursuit model
Accession number: 20165203163241
Authors: Wang, Xiaochan (1, 2); Lu, Wei (1); Chen, Man (3); Wang, Ting (1); Zhang, Yongnian (1, 2); Boukangou, M.P. (1)
Author affiliation: (1) College of Engineering, Nanjing Agricultural University, Nanjing; 210031, China; (2) Jiangsu Province Engineering Laboratory for Modern Facilities Agricultural Technology and Equipment, Nanjing; 210031, China; (3) Nanjing Research Institute for Agricultural Mechanization, Ministry of Agriculture, Nanjing; 210014, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 8-13
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Transportation for harvest and plant protection activities inside greenhouse calls for a lot of labor. The available transporting equipment has limited function which is not very flexible. While the widely used railway transportation vehicles inside greenhouse in many developed countries are hard to introduce to China due to variable construction styles and nonstandard layouts, some automatic following system is urgently in need. Thus a kind of autonomous transportation system for greenhouse harvesting activity was presented based on Kinect sensor developed by Microsoft Company. The Kinect sensor could acquire the depth data of each pixel on the picture, from which the skeleton of a workman could be analyzed by several image processing algorithms. Direction and heading angle was determined by the real-time coordinate of the center of gravity of the skeleton. At the same time, the 3D coordinate of the workman was kept and the tracking path was thus formed. To avoid dramatic turning, adaptive function was applied to optimize the path firstly. And then pure pursuit method was introduced to complete the tracking stably and precisely. The look-ahead distance was timely decided by fuzzy controller, with which the vehicle would track more flexibly according to different look-head distances. The result showed that the system was able to turn freely and precisely while avoiding drastic turning. The largest lateral deviation of straight line tracking was smaller than 10.0 cm, and the largest depth deviation was 5.5 cm. The working function had nothing to do with the light condition, which met the demands of harvesting and goods transportation in greenhouse in different seasons.
Number of references: 17
Main heading: Transportation
Controlled terms: Greenhouses - Harvesting - Image processing - Musculoskeletal system
Uncontrolled terms: Autonomous transportation system - Harvesting activities - Image processing algorithm - Path optimizations - Picking - Pure pursuits - Railway transportation - Variable constructions
Classification code: 461.3 Biomechanics, Bionics and Biomimetics
Biomechanics, Bionics and Biomimetics
- 821.3 Agricultural Methods
Agricultural Methods
- 821.6 Farm Buildings and Other Structures
Farm Buildings and Other Structures
Numerical data indexing: Size 1.00e-01m, Size 5.50e-02m
DOI: 10.6041/j.issn.1000-1298.2016.12.002
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
53. Adaptive simplification for point cloud based on hierarchical clustering and topological connectivity model
Accession number: 20165203162992
Authors: Zhou, Yu (1, 2); Liu, Meng (1, 2); Ma, Zhengdong (3); Du, Farong (4); Ding, Shuiting (4); Min, Min (4)
Author affiliation: (1) School of Transportation Science and Engineering, Beihang University, Beijing; 100191, China; (2) Beijing Key Laboratory for High-efficient Power Transmission and System Control of New Energy Resource Vehicle, Beihang University, Beijing; 100191, China; (3) Department of Mechanical Engineering, University of Michigan, Ann Arbor; 48109, United States; (4) School of Energy and Power Engineering, Beihang University, Beijing; 100191, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 416-423
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Laser-scanning measurement, which has become a prevalent and challenging research topic, has a significant advantage in massive and large-scale data sets acquisition. For the problems that universally exist in massive and high density point cloud sampling, such as low efficiency and bad adaptive curvature, the spatial geometry character of linear point cloud structure is investigated to produce an edge-pair derivative algorithm for line scanning point cloud. On this basis, topological connectivity model is established. To generate dense points in high-curvature areas and sparse points in planar regions efficiently, the local normal-vector variation is substituted for Gaussian curvature to determine the degree of recursive subdivision. Meanwhile, the computational method for the non-equal weighted factor of local normal-vector is presented to estimate the local normal-vector of any point in topological structure. For further subdivision, non-uniform subdivision model whose subdivision criterion is normal variance is built to achieve the subdivision for dense points in high-curvature areas. A relevant simplification system based on the algorithm is developed by using Visual Studio. Many cases are implemented to demonstrate the performance and validate the effectiveness of the method. The comparison with other point-based methods is also performed to illustrate the superiority of the method.
Number of references: 40
Main heading: Topology
Controlled terms: Laser applications - Reverse engineering - Scanning - Surface analysis
Uncontrolled terms: Data simplification - Hier-archical clustering - Laser scanning - Non-uniform subdivisions - Topological connectivity
Classification code: 744.9 Laser Applications
Laser Applications
- 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory
Combinatorial Mathematics, Includes Graph Theory, Set Theory
- 951 Materials Science
Materials Science
DOI: 10.6041/j.issn.1000-1298.2016.12.053
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
54. Effects of NO2diffusion on catalyst diesel particulate filter regeneration
Accession number: 20165203163283
Authors: Liu, Hongqi (1); Gao, Ying (1); Jiang, Hongpeng (2); Fang, Maodong (3); Ma, Bin (1); Chen, Wei (1)
Author affiliation: (1) State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun; 130025, China; (2) China National Heavy Duty Truck Group Co., Ltd., Ji’nan; 250101, China; (3) China Automotive Technology and Research Center, Tianjin; 300300, China
Corresponding author: Gao, Ying(ygao2000@vip.163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 12
Issue date: December 25, 2016
Publication year: 2016
Pages: 354-360 and 366
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming to explain passive regeneration reaction mechanism of catalytic diesel particulate filter, the diffusion mechanism of nitrogen dioxide is studied by experiment and simulation. Due to the wall layers are coated by precious metal, a chemical reaction is genesis in 300 between nitric oxide and oxygen. And reaction can produce nitrogen dioxide. In cake layer, passive regeneration consumes nitrogen dioxide. Therefore, concentration gradient of nitrogen dioxide is formed. The gradient comes into a driving force of the reverse diffusion. Diffusion mechanism includes pore diffusion and Knudsen diffusion in porous media of particulate filter. Because of back diffusion of nitrogen dioxide, it can participate in passive regeneration of soot many times. Research results show that the pressure drop of filter can be controlled within 7.0% offset and NO2concentration can be controlled within 7.3% compared the experimental values with the passive regeneration model which considering the diffusion mechanism. The nitrogen dioxide diffusion effect is more obvious with the increase of inlet temperature. When inlet temperature is increased by 100, the increasing rate of NO2concentration is 1.90~1.95 times of that when temperature is increased by 50. The maximum concentration of NO2is 5.69×10-4at the position of z/L=0.9, H=0.182 9 mm. Analysis of regeneration process of soot retained in the filter shows that a rise in temperature of inlet gas results enhancement of NO2diffusion, and the passive regeneration rate is accelerated. Soot mass retained in the filter is decreased by 55.94% in the first 1 000 s at 425, and soot mass in the filter layer reacts 80.53%. The total decreased soot mass is 3.68 times of the reactive mass at 325. The variation of concentration for NO2and the reaction rates of soot show that diffusion of NO2can effectively increase the passive regeneration rate and extend the active regeneration period.
Number of references: 18
Main heading: Passive filters
Controlled terms: Air filters - Bandpass filters - Diffusion - Dust - Filters (for fluids) - Fuel filters - Nitric oxide - Nitrogen - Nitrogen oxides - Porous materials - Reaction rates - Soot - Temperature
Uncontrolled terms: Concentration gradients - Diesel particulate filters - Diffusion mechanisms - Maximum concentrations - Nitrogen dioxides - Particulate filters - Regeneration - Regeneration reactions
Classification code: 451.1 Air Pollution Sources
Air Pollution Sources
- 451.2 Air Pollution Control
Air Pollution Control
- 641.1 Thermodynamics
Thermodynamics
- 703.2 Electric Filters
Electric Filters
- 802.2 Chemical Reactions
Chemical Reactions
- 804 Chemical Products Generally
Chemical Products Generally
- 804.2 Inorganic Compounds
Inorganic Compounds
- 951 Materials Science
Materials Science
Numerical data indexing: Percentage 5.59e+01%, Percentage 7.00e+00%, Percentage 7.30e+00%, Percentage 8.05e+01%, Time 1.00e+03s
DOI: 10.6041/j.issn.1000-1298.2016.12.044
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
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