2015年第46卷第11期共收錄54篇
1. Accession number: 20160301827846
Title: Effects of glucose solution on characteristics of products from hydrothermal treated wheat straw
Authors: Guo, Shuqing1 ; Wu, Tingting1; Dong, Xiangyuan1; Liu, Kaituo1
Author affiliation: 1 School of Energy & Environment, Zhongyuan University of Technology, Zhengzhou, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 195-200
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Glucose is one of main intermediate components and final aqueous product from biomass hydrothermal carbonization (HTC). To explore the effects of glucose on reaction processing and hydrochars formation, wheat straw was hydrothermally treated in different concentrations of glucose solution, and the process and products were analyzed. All the experiments were carried out in a 2 L autoclave at temperature of 220 for residence time of 120 min. The results show that with increasing concentration of glucose, the yields and carbon content of hydrochars increase slightly. However, the hydrogen and oxygen contents of hydrochars are not substantial. When the added glucose mass is 0.4 times as much as the wheat straw mass, the yield of hydrochars reaches 68.56%. Glucose could cause an increase of mass transfer resistance for sugar monomers produced from hemicelluloses and cellulose degradation to enter the liquid phase. The precipation of glucose could impede the degradation and carbonization reaction of biomass during the HTC process. Thus, the aromatic characteristic peaks of hydrochars in Fourier transform infrared (FTIR) spectra weaken, and the diffraction peak intensity of cellulose in X-ray diffraction (XRD) spectra decreases. Moreover, the thermal stability of hydrochars also decreases. During reutilization of the HTC processing water, the dissolvable sugars could be extracted. When the wheat straw is co-treated with glucose under hydrothermal conditions, degradation of glucose is possible the main pathway. When compared with liquid products from the wheat straw HTC using pure water, the concentrations of furfural, 5-hydroxymethyl-furfural (5-HMF) and acetic acid increase. The concentration of 5-HMF increases to 20.21 g/L when the ratio of glucose to wheat straw is 0.4.
Number of references: 18
Main heading: Glucose
Controlled terms: Carbon - Carbonization - Cellulose - Fourier transform infrared spectroscopy - Liquid sugar - Mass transfer - Straw - Thermochemistry - Thermodynamic stability - X ray diffraction
Uncontrolled terms: 5 hydroxymethyl furfurals - Aqueous products - Fourier transform infrared - Hydrochars - Hydrothermal carbonization - Intermediate components - Mass transfer resistances - Wheat straws
Classification code: 641.1 Thermodynamics - 641.3 Mass Transfer - 801 Chemistry - 802.2 Chemical Reactions - 804 Chemical Products Generally - 804.1 Organic Compounds - 811.3 Cellulose, Lignin and Derivatives - 821.5 Agricultural Wastes - 822.3 Food Products
DOI: 10.6041/j.issn.1000-1298.2015.11.026
Database: Compendex
2. Accession number: 20160301827853
Title: On-line detection testing system of sugar content for hetao melon based on spectra and image information
Authors: Gao, Xiong1 ; Liu, Yu1; Tian, Haiqing1 ; Chen, Yali1; Han, Baosheng1; Li, Zhe1
Author affiliation: 1 College of Mechanical and Electrical Engineering, Inner Mongolia Agricultural University, Huhhot, China
Corresponding author: Tian, Haiqing (hqtian@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 245-251 and 235
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Real-time detection of sugar content plays a crucial role in the estimation of Hetao melon quality. To reduce the effect of size on the diffuse transmittance spectra, an on-line detection testing system based on diffuse transmittance spectra and image information was designed for the evaluation of sugar content of melon. Two main parts (hardware and software) were involved in this device. The hardware includes delivery device, spectrum detection device, image capture device and control system. The software system was designed based on Microsoft Visual C ++ 6.0 language and combined with the software of Omni Driver, FlyCapture2 and OpenCV. With the proposed system, firstly, the spectrum and images of melon were automatically obtained, displayed and saved. Secondly, the sensitive spectrum, color (R, G, B) and volume value of melon were derived by processing spectra and image information. Finally, the sugar content of melon was obtained according to the model of diffuse transmission spectrum and image information fusion. In conclusion, this device could automatically calculate the amount of melon, timely display and save the color value, volume value and sugar content of melon in computer, and detect a sample within 1.2 s with root mean square errors of 1.22 for sugar content. The proposed system was showed to be a promising tool for implementing on-line detection of Hetao melon sugar content.
Number of references: 11
Main heading: Display devices
Controlled terms: Atmospheric spectra - C++ (programming language) - Computer hardware - Computer software - Hardware - Mean square error - Reconfigurable hardware - Visual languages
Uncontrolled terms: Image - Image capture devices - Image information fusions - Melon - Microsoft visual C++ 6.0 - On-line detection - Root mean square errors - Sugar content
Classification code: 443.1 Atmospheric Properties - 605 Small Tools and Hardware - 721.3 Computer Circuits - 722 Computer Systems and Equipment - 722.2 Computer Peripheral Equipment - 723 Computer Software, Data Handling and Applications - 723.1.1 Computer Programming Languages - 922.2 Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2015.11.033
Database: Compendex
3. Accession number: 20160301827863
Title: Remote monitoring network for soil moisture based on iridium communication technology
Authors: Liu, Weiping1, 2 ; Gao, Zhitao1, 2; Liu, Shengbo1, 2; Tao, Xin3; Zhao, Yandong1, 2
Author affiliation: 1 School of Technology, Beijing Forestry University, Beijing, China
2 Beijing Laboratory of Urban and Rural Ecological Environment, Beijing Forestry University, Beijing, China
3 MENOBLE Co., Ltd., Beijing, China
Corresponding author: Zhao, Yandong (yandongzh@bjfu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 316-322
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to monitor the real-time soil moisture, temperature and rainfall in remote area where GPRS communication is not accessible, a real-time soil moisture monitoring system was designed by using Iridium communications, real-time information acquisition and Internet technology. The “Internet of Things” architecture was founded and the self-developed Iridium transparent transmission module as well as real-time data acquisition module were designed based on the terminal module 9602 in short burst data (SBD) transceiver. It implemented intelligent, network-based real-time soil moisture monitoring, as well as historical data querying, downloading and text message alarming according to the preset threshold values. Functions such as sensors and communication failure alarm made it possible for safe, steady, reliable communications. Since August 2011, the system came into operation in Shandong Province, Beijing City and other places. System could be safe, stable and reliable to obtain the soil moisture content, temperature and rainfall. The running result indicated that the data transmission system had the advantages of high reliability, low communication fees and wide coverage. The data receiving rate could reach to 97.2%, and the communication fee was >200 Yuan per month, which achieved the aim of long-term monitoring of soil moisture, temperature and rainfall.
Number of references: 13
Main heading: Monitoring
Controlled terms: Data acquisition - Data communication systems - Internet - Iridium - Microwave measurement - Moisture - Moisture control - Rain - Soil moisture - Soil surveys - Soils - Technology transfer
Uncontrolled terms: Communication failure - Communication technologies - Real time data acquisition - Real time monitoring - Reliable communication - Short bursts - Soil moisture monitoring - Transparent transmission
Classification code: 443.3 Precipitation - 483.1 Soils and Soil Mechanics - 547.1 Precious Metals - 723 Computer Software, Data Handling and Applications - 723.2 Data Processing and Image Processing - 731.3 Specific Variables Control - 942.2 Electric Variables Measurements
DOI: 10.6041/j.issn.1000-1298.2015.11.043
Database: Compendex
4. Accession number: 20160301827828
Title: Multi-objective optimization design of double five-bar transplanting mechanism for rape pot seedling
Authors: Liao, Qingxi1 ; Liu, Mingfeng1; Zhang, Zhao1; Hu, Xianpeng1
Author affiliation: 1 College of Engineering, Huazhong Agricultural University, Wuhan, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 49-56
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to overcome the shortages of complex structure and too much parameters of double five-bar transplanting which are difficult to be solved by traditional analytical method, the working principle and kinematics model of rape pot seedling were analyzed. Also a multi-objective optimization design model was established. The calculation and parameter analysis were carried out with Matlab software. And the kinematics characteristics of double five-bar transplanting mechanism were analyzed, which matched with the solving results of the multi-objective optimization design model. The consistency verification experiment was carried out by high speed photography system. The result showed that both of transplanting spacing and locus height of the rape pot seedling transplanter were 300 mm, with the forward speed of 0.3 m/s and transplanting frequency of 60 seedlings per minute. The displacement between buried locus and unearthed locus was less than 0.91 mm with the transplanting depth within the range of 60~100 mm, which revealed the good verticality and coincidence between them. The horizontal velocity of duckbill-type planting unit was 0.04 m/s at the lowest point of the transplanting locus, and the swinging angle was in the range of -2.3°~ 2.3° at planting stage, which were benefit for planting. In falling stage, the swinging angle of duckbill-type planting unit was in the range of -2.4°~2.2° and the vertical velocity was less than 0.7 m/s, so that the vertical displacement was too small to catch the seedling for duckbill-type planting unit. The demands of rapeseed mechanized transplanting could be met with proposed method.
Number of references: 19
Main heading: Multiobjective optimization
Controlled terms: High speed photography - Kinematics - MATLAB - Photography
Uncontrolled terms: Consistency verifications - Horizontal velocity - Kinematics characteristics - Pot seedling transplanters - Rape - Transplanter - Transplanting mechanisms - Vertical displacements
Classification code: 742.1 Photography - 746 Imaging Techniques - 921 Mathematics - 921.5 Optimization Techniques - 931.1 Mechanics
DOI: 10.6041/j.issn.1000-1298.2015.11.008
Database: Compendex
5. Accession number: 20160301827859
Title: Non-destructive observation of plant root pressure based on combined measurement of stem diameter and sap flow
Authors: Yun, Yuliang1, 2 ; Cheng, Qiang1; Lutz, Damerow3; Sun, Yurui1
Author affiliation: 1 College of Information and Electrical Engineering, China Agricultural University, Beijing, China
2 College of Mechanical and Electrical Engineering, Qingdao Agricultural University, Qingdao, China
3 Institute of Agricultural Engineering, University of Bonn, Bonn, Germany
Corresponding author: Sun, Yurui (pal@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 290-295
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: As the nighttime replenishment engine, root pressure is one of the most important plant water physiological indices. But root pressure measurement is still a technical problem needed to be resolved. Especially for little plants or herbaceous plants, they are not allowed to be measured invasively. Thus it is a greater technical challenge. On the basis of the combined measurement of stem diameter and sap flow, we attempted to measure the plant root pressure by changing the algorithm orders of the Steppe water flow and storage model. Three greenhouse eggplant samples were selected in the experiment and two groups of five consecutive days of experimental data, which were independent, were displayed. The results showed that from night to dawn, the sap flow rate was zero and the stem grew slowly. Meanwhile, the root pressure began to appear. In the sunny days, the transpirations of eggplant samples were more intensive, the sap flow rates were higher and the stem shrank more significantly. Accordingly, the root pressure increased faster at night. On the contrary, when it was cloudy, the root pressure amplitudes of the eggplant samples were smaller. Obviously, the dynamics of the root pressure were fully consistent with the interpretation for the dynamics of the sap flow rate and the stem diameter, the influence of meteorological data and the known plant physiological water adaptability law. Therefore, it's feasible to observe the root pressure dynamics of the eggplant samples nondestructively by changing the algorithm orders of the Steppe water flow and storage mathematical model. It allows conducting the similar experiments for other plants.
Number of references: 27
Main heading: Atmospheric movements
Controlled terms: Digital storage - Dynamics - Flow of water - Hydraulics - Meteorology - Physiology - Plants (botany)
Uncontrolled terms: Combined measurements - Eggplant - Physiological indices - Pressure amplitudes - Sap flow - Stem diameter - Storage model - Technical challenges
Classification code: 443.1 Atmospheric Properties - 461.9 Biology - 631.1.1 Liquid Dynamics - 632.1 Hydraulics - 722.1 Data Storage, Equipment and Techniques
DOI: 10.6041/j.issn.1000-1298.2015.11.039
Database: Compendex
6. Accession number: 20160301827867
Title: Spatial distribution characteristics of droughts in guanzhong plain based on structural similarity
Authors: Bai, Xuejiao1, 2 ; Wang, Pengxin1, 2 ; Xie, Yi1, 2; Wang, Lei1, 2; He, Peng1, 2
Author affiliation: 1 College of Information and Electrical Engineering, China Agricultural University, Beijing, China
2 Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture, Beijing, China
Corresponding author: Wang, Pengxin (wangpx@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 345-351
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Seasonal drought is a main disaster for agricultural production in Guanzhong Plain, and research on spatial distribution characteristics and variation patterns of droughts under the global climate change is of great theoretic significance and applied value. Based on time series of drought monitoring results of vegetation temperature condition index (VTCI) from early March to late May during 2003 to 2014, the structural similarity (SSIM) was applied to analyze spatial characteristics of the time series of VTCI in the plain, and impact factors which affecting the spatial characteristics were analyzed as well. The results showed that the spatial characteristics of VTCI in Guanzhong Plain had distinctive regional variations and spatial heterogeneity, and the structural factor was the main factor affecting the variations. In general, the spatial variations of VTCI were influenced by the distribution pattern of water and heat conditions and terrain, as well as the microtopography, the underlying surface and the human factor. The variations were highly correlated and very sensitive to the changes in the microtopography, the underlying surface or the human factor when they became the dominant factors. Compared with other analytical methods that used some indexes as the indicators of droughts or made statistical models, the SSIM which has the structure information of images was a better approach for indicating the spatial characteristics of the droughts and their variations quantitatively, accurately and conveniently.
Number of references: 24
Main heading: Spatial distribution
Controlled terms: Agriculture - Climate change - Drought - Human engineering - Spatial variables measurement - Time series - Vegetation
Uncontrolled terms: Distribution characteristics - Guanzhong Plain - Impact factor - Structural similarity - Vegetation temperature condition index
Classification code: 443.1 Atmospheric Properties - 444 Water Resources - 461.4 Ergonomics and Human Factors Engineering - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 921 Mathematics - 922.2 Mathematical Statistics - 943.2 Mechanical Variables Measurements
DOI: 10.6041/j.issn.1000-1298.2015.11.047
Database: Compendex
7. Accession number: 20160301827849
Title: Ultrafine grinding and alcolhol liquefaction for corn stover
Authors: Liu, Huan1 ; Gu, Xingwei1; Wang, Xue1; Han, Lujia1; Xiao, Weihua1
Author affiliation: 1 College of Engineering, China Agricultural University, Beijing, China
Corresponding author: Xiao, Weihua (xwhddd@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 214-220
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The aim of this study was to investigate the effect of micronization on the physicochemical properties of corn stover. With the decrease of powders in four different particle sizes, the bulk density changed from 0.11 g/mL to 0.41 g/mL, the surface area increased to 1.05 m2/g, and the angle of repose and slide of corn straw powder increased to varied degrees. Changes of the microstructure and physicochemical characteristics of different powders were assessed by using scanning electron microscopy and X-ray diffractometry. Compared to general powders, with the agglomerates in ultrafine grinding powder and increased size distributions, the ultrafine grinding reduced the particle size and crystallinity of the wheat straw significantly, that means the ultrafine powder diameter was reduced to 15.54 μm, and the crystallinity was reduced from 44.72% to 13.68%. Both of the microwave-assisted and general oil bath heating were carried out in alcolhol liquefaction. With the microwave heating, the liquefied yield of ultrafine powder was 90.37% within 5 min, however it needed around 1 h with oil bath heating, which indicated the effectivity of microwaves. With the general oil bath heating, the liquefied yield of ultrafine powder was 95.30% with in 120 min, which was higher than that of common powder (<0.25 mm). The results showed that ultrafine grinding technology could increase the liquefaction extent and rate. In addition, ultrafine grinding could impove liquefied yield by reducing the particle size and crystallinity of the corn stover.
Number of references: 23
Main heading: Grinding (machining)
Controlled terms: Heating - Liquefaction - Microwave heating - Particle size - Powders - Scanning electron microscopy - X ray diffraction analysis
Uncontrolled terms: Corn stover - Different particle sizes - Microwave assisted - Physicochemical characteristics - Physicochemical property - Structural composition - Ultra fine powder - Ultra-fine grinding
Classification code: 604.2 Machining Operations - 642.1 Process Heating - 802.3 Chemical Operations
DOI: 10.6041/j.issn.1000-1298.2015.11.029
Database: Compendex
8. Accession number: 20160301827840
Title: Influence of high voltage electrostatic field on physiological indexes and yield of hydroponic tomato
Authors: Li, Meiqing1 ; Wu, Yanyou1, 2; Li, Qinglin1
Author affiliation: 1 Key Laboratory of Modern Agriculture Equipment and Techenology, Ministry of Education, Jiangsu University, Zhenjiang, China
2 State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 145-150 and 136
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In this paper, high voltage electrostatic field (HVEF) was applied to agricultural production. The experimental equipment of HVEF was designed. To explore the effect of HVEF on physiological characteristics and yield of hydroponic tomato, illustrate the influence mechanism of HVEF on the tomato seedlings, tomato seedlings were cultivated in greenhouse. The seedlings with two true leaves and the same height were transplanted to experimental lab and gone on the treatment of HVEF. The seedlings were cultivated in nutrient solution mode. Three different high voltage electrostatic fields of 2.00, 2.25, 2.50 kV/cm were adjusted and the seedlings between the two parallel-electrode plates were treated under this condition for 8 h. After finishing the treatments of HVEF, some of the seedlings were continued to be cultured by using of inorganic matrix and nutrient solution culture in greenhouse. Then, the stem diameter, fresh weight, chlorophyll content and root morphological characteristics of tomato seedlings, as well as ultimate yield of tomato were studied. In addition, root activities and membrane permeability of other seedlings, and the changes of ion concentration of uptake solution as soon as HVEF treatment was finished, were analyzed. The results show that the high voltage electrostatic field, compared with the control (without electric field), changes the growth characteristics of tomato, and the electric field intensity of 2.25 kV/cm increases stem diameter, fresh weight and chlorophyll content, and promotes the effect of the optimal root morphology. As a result, the yield is increased by 23% in contrast with the control.
Number of references: 13
Main heading: Seed
Controlled terms: Agriculture - Chlorophyll - Electric fields - Electrostatics - Fruits - Greenhouse effect - Greenhouses - Nutrients - Physiology
Uncontrolled terms: Agricultural productions - Electric field intensities - High voltage electrostatic field - Morphological characteristic - Physiological characteristics - Physiological indices - Tomato - Yield
Classification code: 451 Air Pollution - 461.9 Biology - 701.1 Electricity: Basic Concepts and Phenomena - 804.1 Organic Compounds - 821 Agricultural Equipment and Methods; Vegetation and Pest Control
DOI: 10.6041/j.issn.1000-1298.2015.11.020
Database: Compendex
9. Accession number: 20160301827832
Title: Structure optimization of suction device and performance test of integrated water and fertilizer fertigation machine
Authors: Liu, Yonghua1, 2 ; Shen, Mingxia1 ; Jiang, Xiaoping3; Jiang, Kuanshu2; Feng, Qi3
Author affiliation: 1 Laboratory of Modern Facility Agriculture Technology and Equipment Engineering in Jiangsu Province, Nanjing Agricultural University, Nanjing, China
2 Engineering and Technology Center for Modern Horticulture, Jiangsu Polytechnic College of Agriculture and Forestry, Jurong, China
3 Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, China
Corresponding author: Shen, Mingxia (mingxia@njau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 76-81 and 48
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to optimize the integrated water and fertilizer fertigation machine and improve its fertigation performance, the working principle of Venturi injector was analyzed. According to the table of economic flow rate, the frictional loss and local loss of pipeline system as well as fertigation machine were taken into consideration. Taking flow of fertilizer absorption as evaluation index, single factor optimization experiment was carried out on some main parameters in Venturi injector which is the key component in the system by using CFD numerical calculation, including tapered angle α, divergent angle β and throat diameter d0. The influence rule of three parameters above on fertigation performance was obtained. Then through the orthogonal test with 3-factors and 3-levels, the combination of optimal structure parameters was got with CFD numerical calculation, that means, tapered angle α=20°, divergent angle β=8° and throat diameter d0=6 mm. And the best fertigation performance was got when the angle between the absorption tube and the main pipe of Venturi was around 40°. Comparing with the simulated data and actual operation data of integrated water and fertilizer fertigation machine, it indicated that the fertigation absorption flow of Venturi was increased by about 38.6% after CFD numerical optimization, and the overall fertilizer absorption flow was increased by about 47.6% with fertigation machine matched with the fuzzy automatic control system. The energy saving effect is remarkable.
Number of references: 15
Main heading: Structural optimization
Controlled terms: Automation - Computational fluid dynamics - Energy conservation - Fertilizers - Integration - Optimization - Water absorption
Uncontrolled terms: Energy-saving effect - Factor optimization - Fertigations - Numerical calculation - Numerical optimizations - Performance tests - Structure optimization - Venturi injectors
Classification code: 525.2 Energy Conservation - 723.5 Computer Applications - 731 Automatic Control Principles and Applications - 802.3 Chemical Operations - 804 Chemical Products Generally - 921.2 Calculus - 921.5 Optimization Techniques
DOI: 10.6041/j.issn.1000-1298.2015.11.012
Database: Compendex
10. Accession number: 20160301827829
Title: Herbicidal mechanism and key components design for paddy weeding device
Authors: Tao, Guixiang1, 2 ; Wang, Jinwu1 ; Zhou, Wenqi1; Niu, Chunliang1; Zhao, Jiale1
Author affiliation: 1 College of Engineering, Northeast Agricultural University, Harbin, China
2 College of Engineering, Heilongjiang Bayi Agricultural University, Daqing, China
Corresponding author: Wang, Jinwu (jinwuw@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 57-63
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In the process of rice growth, the weeds will decrease the quality and yield of rice. At present, both herbicide and manual weed control have many shortages. Chemical weed control causes environmental pollution, reduces crop nutrition and increases weed drug resistance. Manual weed control is labor-intensive, low-efficient and bounds labor. Mechanical weed control is helpful to protect environment and the high efficient will be an irresistible trend. In order to improve the weeding rate and reduce the damage rate of rice seedlings while weeding, the mechanism analysis and improvement of paddy field weeding device was were done. The weeding device was symmetrically installed on the two groups of spring tooth disc (left and right). The two groups of spring tooth disc rotated to complete the weeding by flexible shaft. According to kinematics analysis of the key components of spring tooth disc and the strength analysis of rice seedlings and barnyard grass, the kinematics model of spring tooth disc and stress model of paddy rice seedlings and barnyard grass were established. According to the stress analysis, the strength condition of rice seedlings and barnyard grass were presented. According to physical characteristics of rice seedlings and barnyard grass and the basic parameters of spring tooth disc, the variation range of rotating angular velocity and teeth number of spring tooth disc were obtained. Through various testing on the compaction device, the optimum working parameters of the compaction device were obtained. The test showed that rotating angular velocity was 25.1 rad/s and teeth number was 5.Performance testing in field was carried out for the paddy weeding device. The results showed that weeding rate was 80% and injury rate was 4.5%. The weeding machine had good quality, and had met the agronomic technical requirements when rotating angular velocity was 25.1 rad/s and teeth number was 5.
Number of references: 15
Main heading: Weed control
Controlled terms: Angular velocity - Chemical analysis - Compaction - Design - Disks (machine components) - Drug therapy - Kinematics - Mechanisms - Pollution control - Strain - Stress analysis
Uncontrolled terms: Environmental pollutions - Kinematics analysis - Kinematics modeling - Optimum working parameters - Paddy fields - Physical characteristics - Technical requirement - Weeding spring tooth disc
Classification code: 461.6 Medicine and Pharmacology - 601.2 Machine Components - 601.3 Mechanisms - 931.1 Mechanics - 951 Materials Science
DOI: 10.6041/j.issn.1000-1298.2015.11.009
Database: Compendex
11. Accession number: 20160301827817
Title: Hydraulic passivity based nonlinear robust control for electrohydraulic system
Authors: Xiong, Yi1 ; Wei, Jianhua1 ; Hu, Bo1; Feng, Ruilin1
Author affiliation: 1 The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou, China
Corresponding author: Wei, Jianhua (jhwei@zju.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 383-391
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Taking into account the strong nonlinearity associated with the dynamics of the electrohydraulic system, a passivity based nonlinear robust control method was developed for it. In the proposed method, the Lyapunov function was designed with the sliding mode of tracking error and the pressure error storage function constructed in the hydraulic passivity theory. Thus the backstepping design process can be decomposed into two cascaded steps: position tracking and pressure tracking. The electrohydraulic system has a redundant dimension, as the two chambers of the hydraulic actuator have different areas. The added internal dynamics of pressure also brought the stability issue. To handle this difficulty, a steady state working point based assignment strategy was presented. This strategy combines force and flow constraint conditions, such that it can assign unique desired pressure for each chamber of the hydraulic actuator. As a result, the nonlinear robust control law was synthesized. Experiments were carried out on a prototype system to validate the effectiveness of the proposed method. The experiment results show that with the developed controller, the electrohydraulic system achieves accurate tracking. The error is no more than 5 μm, while tracking constant speed and sinusoidal trajectories. The proposed control method presents good tracking performance and performance robustness.
Number of references: 16
Main heading: Hydraulic actuators
Controlled terms: Actuators - Backstepping - Errors - Hydraulic machinery - Hydraulics - Lyapunov functions - Robust control - Tracking (position)
Uncontrolled terms: Assignment strategies - Constraint conditions - Electro-hydraulic system - Nonlinear - Nonlinear robust control - Performance robustness - Sinusoidal trajectories - Tracking performance
Classification code: 632.1 Hydraulics - 632.2 Hydraulic Equipment and Machinery - 731 Automatic Control Principles and Applications - 732.1 Control Equipment - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2015.11.052
Database: Compendex
12. Accession number: 20160301827843
Title: Effects of soft rock modified sandy soil on NH4+-N adsorption characteristics
Authors: She, Xiaoyan1, 2 ; Wei, Xiaorong1, 2; Wei, Yanchun1; Ma, Tiane1; Xu, Jingjing3; Zhang, Xingchang1, 2
Author affiliation: 1 College of Resources and Environment, Northwest A&F University, Yangling; Shaanxi, China
2 State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling; Shaanxi, China
3 Institute of Agricultural Economics and Information, Jiangxi Academy of Agricultural Sciences, Nanchang, China
Corresponding author: Zhang, Xingchang (zhangxc@ms.iswc.ac.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 165-173
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Due to the widely existence of soft rock and the exploitation of coal resource, serious ecological and environmental problems occurred in the contiguous areas of Shanxi, Shaanxi and Inner Mongolia in China. In order to restore regionally ecological environment, this study was conducted to improve sandy soil using soft rock in the energy communities, and realize the transformation of soft rock into available resources. Previous research found that soft rock could improve hydraulic properties of sandy soil. But there are few researches about the nutrient availability of soft rock distributed into sandy soil. Soft rock was mixed in sandy soil with seven ratios: 0, 10%, 25%, 50%, 75%, 90% and 100%. Adsorption kinetic were determined and fitted with Freundlich, Langmuir, Temkin and Dubinin-Radushkevich models. Adsorption isotherms were measured and modeled with Pseudo-first-order, Pseudo-second-order, Bi-constant and Intra-particle diffusion models. This study was conducted to understand the effects of different additive proportions of soft rock amended sandy soils on the adsorption of NH4+-N, and to select the optimal adsorption model of improved soil. The results can be used to guide reasonable fertilization of nitrogenous and improve the utilization efficiency of fertilize. The results showed that: with the extension of reaction times and the increase of equilibrium concentration, the NH4+-N adsorption capacity was increased in improved soil. Reaching to the adsorption equilibrium, sandy soil needs 4 hours and soft rock needs 16 hours. Adsorption capacity of NH4+-N was the largest in sandy soil and the least in soft rock, the maximum adsorption of NH4+-N in soft rock was 20 times of sand soil. With the increase of the soft rock proportion in improved soil, NH4+-N optimal adsorption was increased linearly. Soft rock could improve the NH4+-N adsorption capacity of sandy soil. The pseudo-second-order kinetic model and the Freundlich isotherm model could well describe NH4+-N absorption in improved soil. NH4+-N adsorption is a spontaneous process and a favorable adsorption.
Number of references: 25
Main heading: Soils
Controlled terms: Adsorption - Adsorption isotherms - Coal deposits - Ecology - Kinetics - Rocks - Sand
Uncontrolled terms: Adsorption characteristic - Adsorption kinetics - Equilibrium concentration - Freundlich isotherm model - Isothermal adsorption - Pseudo-second-order kinetic models - Sandy soils - Soft rocks
Classification code: 454.3 Ecology and Ecosystems - 483.1 Soils and Soil Mechanics - 503 Mines and Mining, Coal - 802.3 Chemical Operations - 931 Classical Physics; Quantum Theory; Relativity
DOI: 10.6041/j.issn.1000-1298.2015.11.023
Database: Compendex
13. Accession number: 20160301827823
Title: Design and experiment of tactile sensors for testing surface roughness of fruits and vegetables
Authors: Tao, Yongting1 ; Zhou, Jun1 ; Meng, Yimeng1; Zhang, Na1; Yang, Xiaorong1
Author affiliation: 1 Key Laboratory of Intelligent Agricultural Equipment in Jiangsu Province, Nanjing Agricultural University, Nanjing, China
Corresponding author: Zhou, Jun (zhoujun@njau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 16-21 and 42
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to provide useful information for grasping of agricultural robot via perceiving surface roughness of fruits and vegetables, we designed and produced a PVDF tactile sensor, perceiving surface roughness via processing of tactile signal. With the mechanical analysis by ANSYS, we could determine the effective area and the reasonable location of sensor model. Four PVDF piezoelectric films and the resistance strain chips were randomly arranged in the model of fingers. The random distribution of the sensor elements would make tactile sensor as much as possible to obtain a wealth of information about the work environment. We built up a platform of tactile information detection to process data collection from three different roughnesses of fruits through multi channels data acquisition program. After extracting the sample characteristics, the maximum value, the minimum value and the difference between the maximum and minimum values of the signal were calculated as the tactile sensor characteristics. The differences between the maximum value and the minimum value of the signal were used as the pressure sensor characteristics. Then the SVR algorithm model was established to test the surface roughness of the fruits and vegetables. Experimental results were consistent with the actual setting of roughness class, which proved that the tactile sensor can detect surface roughness characteristics of fruits and vegetables.
Number of references: 20
Main heading: Surface roughness
Controlled terms: Agriculture - Data acquisition - Fruits - Signal detection - Vegetables
Uncontrolled terms: Acquisition programs - Agricultural robot - Fruits and vegetables - Sensor characteristics - Support vector - Surface roughness characteristics - Tactile sensors - Wealth of information
Classification code: 716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 821.4 Agricultural Products - 931.2 Physical Properties of Gases, Liquids and Solids
DOI: 10.6041/j.issn.1000-1298.2015.11.003
Database: Compendex
14. Accession number: 20160301827826
Title: Path planning based on minimum energy consumption for plant protection UAVs in sorties
Authors: Xu, Bo1 ; Chen, Liping2, 3; Tan, Yu1 ; Xu, Min2, 3
Author affiliation: 1 College of Engineering, China Agricultural University, Beijing, China
2 Beijing Key Laboratory of Intelligent Equipment Technology for Agriculture, Beijing, China
3 Beijing Research Center of Intelligent Equipment for Agriculture, Beijing, China
Corresponding author: Tan, Yu (tanyu32@sina.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 36-42
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: According to back-to-back traversal of plant protection UAV, a kind of working area decomposing method based on grid method was used to extract the UAV working path. A route planning algorithm with the minimum return number was proposed in order to reduce the ineffective energy consumption in non-operate situation. The spraying amount and return points of the sorties were reasonably allocated to improve operational efficiency. The simulation results show that using this algorithm in an area of 15 600 m2, compared to the return route in the liquid exhaustion situation, energy consumption of the UAV was reduced by 5.99%; while in an area of 42 000 m2, energy consumption of the UAV was even reduced by 12.89%. When the operation area was larger, the energy-saving effect was more obvious, which proved the feasibility of route planning algorithm. Field tests in an area of 2 500 m2proved that there were deviations between theory and practical routes. The possible reasons were GPS positioning error, wind and center of gravity in liquid. So the GPS positioning accuracy needs to be improved, and the flight control system needs to be further improved. This flight route planning algorithm was proposed for automatic UAVs in unmanned operation, thus the flight routes were set before operation, and the energy consumption of UAVs and flight sorties can be estimated in advance. Nowadays, the unmanned operation becomes a new trend, and this flight route planning algorithm can be widely used in precision agriculture.
Number of references: 13
Main heading: Motion planning
Controlled terms: Algorithms - Energy conservation - Energy utilization - Flight control systems - Global positioning system - Tracking (position) - Unmanned aerial vehicles (UAV)
Uncontrolled terms: Autonomous flying - Energy-saving effect - Grid methods - Minimum energy consumption - Multi-sortie operation - Operational efficiencies - Plant protection - Precision Agriculture
Classification code: 525.2 Energy Conservation - 525.3 Energy Utilization - 652.1 Aircraft, General - 652.3 Aircraft Instruments and Equipment
DOI: 10.6041/j.issn.1000-1298.2015.11.006
Database: Compendex
15. Accession number: 20160301827851
Title: Kinetics study of ultrasonic degradation of patulin in apple juice
Authors: Gao, Zhenpeng1 ; Liu, Rui1; Zhang, Deju1; Yuan, Yahong1; Yue, Tianli1
Author affiliation: 1 College of Food Science and Engineering, Northwest A&F University, Yangling; Shaanxi, China
Corresponding author: Yue, Tianli (yuetl@nwsuaf.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 230-235
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: China is the biggest apple juice concentrate producer in the world, while some security problems, especially patulin still occur in apple juice concentrate industry. These problems are obstacle to produce high quality apple juice concentrate in China. In order to reduce the content of patulin and improve the safety of apple juice, the kinetics of ultrasonic degradation of patulin in apple juice was studied. The pseudo-first order kinetics models were established to investigate the effect of ultrasonic power, frequency and temperature on the degradation of patulin. The results showed that the ultrasonic power was coincided with the pseudo-first order kinetics models in patulin degradation process. The biggest degradation rate was obtained at a power of 490 W. The power degradation constant kPvalue increased with the enhancing power. The power degradation constant kPand the ultrasonic power P was kP=6×10-5P-0.0117. The ultrasonic frequencies were consitent with the pseudo-first order kinetics models in patulin degradation process. The results indicated that 45 kHz was the optimal frequency. The frequencies degradation constant kfand the ultrasonic frequencies f was kf=-8×10-4f2+0.111 9f-2.512 6.The temperature was coincided with the pseudo-first order kinetics models in patulin degradation process. The results suggested that 30 was the optimal temperature. The temperature degradation constant kTand the temperature T was kT=-1×10-4T2+0.006 1T-0.076 9.The study of patulin degradation kinetics will resolve the pollution problem of patulin and provide the theoretical basis for industry controlling of patulin in the producing of cloudy apple juice and apple jam.
Number of references: 20
Main heading: Fruits
Controlled terms: Degradation - Enzyme kinetics - Fruit juices - Kinetics - Ultrasonic waves - Ultrasonics
Uncontrolled terms: Apple juice - Apple juice concentrates - Degradation kinetics - Patulin - Pseudo first-order kinetics - Temperature degradation - Ultrasonic degradation - Ultrasonic frequency
Classification code: 753.1 Ultrasonic Waves - 802.2 Chemical Reactions - 821.4 Agricultural Products - 822.3 Food Products - 931 Classical Physics; Quantum Theory; Relativity
DOI: 10.6041/j.issn.1000-1298.2015.11.031
Database: Compendex
16. Accession number: 20160301827835
Title: Parameter estimation and verification of CERES-maize model with GLUE and PEST methods
Authors: Song, Libing1, 2 ; Chen, Shang1, 2; Yao, Ning1, 2; Feng, Hao2, 3; Zhang, Tibin3; He, Jianqiang1, 2
Author affiliation: 1 Key Laboratory for Agricultural Soil and Water Engineering in Arid Area, Ministry of Education, Northwest A&F University, Yangling; Shaanxi, China
2 Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling; Shaanxi, China
3 Institute of Water and Soil Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling; Shaanxi, China
Corresponding author: He, Jianqiang (jianqiang_he@nwsuaf.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 95-111
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Crop model has been becoming a powerful tool for agricultural water and nitrogen management and implementation of water-saving irrigation. This study was to explore the accuracy of CERES-Maize model for its simulations of summer maize growth, development, yield, and soil moisture under different scenarios of water stress. Field experiments were conducted under a rainout shelter for summer maize growing under water stresses at different growth stages in two consecutive growth seasons (2013 and 2014). The whole growth season of maize was divided into four stages (seeding, jointing, tasseling, and grain filling). Water stress occurred at every single stage, while irrigations were applied at the other three stages. Thus, there were four different levels of water stress period (D1~D4). Two irrigation levels of 70 mm (I1) and 110 mm (I2) were applied according to the average rainfall during growth season of summer maize in 56 years. Consequently, there were a total of 8 treatments, with 3 replicates for each. The plots followed a split-plot experiment design. An extra control treatment with irrigation at all four stages was arranged nearby. The experimental data were used to calibrate and validate the CERES-Maize model with two parameter estimation tools of GLUE (Generalized likelihood uncertainty estimation) and PEST (Parameter ESTimation). Additionally, an overall evaluation was made with cross validation method for the prediction accuracy of the CERES-Maize model. Results showed that both GLUE and PEST had good stability and convergence for the estimation of genetic parameters of CERES-Maize model. The parameters values separately estimated with GLUE and PEST were very close. However, PEST had higher efficiency since it consumed much less time than the GLUE. CERES-Maize model can precisely simulate the growth, development, yield, and soil moisture of summer maize under full irrigation condition, since the absolute relative error (ARE) and relative root mean squared error (RRMSE) values of model calibration and verification were only between 6% and 8%. Anthesis and maturity dates of summer maize were different when water stresses occurred at different growth stages, but CERES-Maize model failed to simulate such kind of phenology differences caused by water stresses. In cross-validation, model simulation errors became bigger when water stresses occurred at early stages, especially at jointing stage. CERES-Maize model failed to correctly simulate the influences of water stresses at early growth stages on the final grain yield of summer maize, which was probably caused by the underestimation of LAI under such conditions. Lower estimated LAI values then made the simulations of ET incorrect. In general, CERES-Maize model was proved to be limited to simulate the growth, yield, and soil moisture of summer maize when under serious water stresses at early growth stages. It is necessary to modify accordingly the CERES-Maize model if it will be used in the simulation of agro-ecological systems of summer maize in arid and semi-arid areas of China.
Number of references: 61
Main heading: Grain (agricultural product)
Controlled terms: Errors - Forestry - Glues - Gluing - Grain growth - Irrigation - Mean square error - Moisture - Parameter estimation - Soil moisture - Soils - Water conservation
Uncontrolled terms: CERES maizes - Cross-validation methods - DSSAT - Generalized likelihood uncertainty estimation - Model calibration and verification - PEST - Root mean squared errors - Summer maize
Classification code: 444 Water Resources - 483.1 Soils and Soil Mechanics - 821.3 Agricultural Methods - 821.4 Agricultural Products - 922.2 Mathematical Statistics - 933.1.2 Crystal Growth
DOI: 10.6041/j.issn.1000-1298.2015.11.015
Database: Compendex
17. Accession number: 20160301827830
Title: Design and test of spatial cam for liquid fertilizer assigned machinery
Authors: Zhou, Wenqi1 ; Wang, Jinwu1 ; Pan, Zhenwei1; Tang, Han1; Wang, Qi1; Duo, Tianyu1
Author affiliation: 1 College of Engineering, Northeast Agricultural University, Harbin, China
Corresponding author: Wang, Jinwu (jinwuw@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 64-69
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to satisfy the performance requirements of spatial cam mechanism in rotary converter of liquid fertilizer applicator, such as stable working and precise liquid fertilization, a mathematical model of spatial cam was established. The software for optimizing the spatial cam was developed by using Visual Basic 6.0.The average radius of cylinder was got as 37 mm and curve profile of spatial cam was obtained. Three-dimensional model and kinematics simulation of spatial cam mechanism were established by using Pro/E software, which verified the design reasonability of spatial cam mechanism. Finally, the mechanism was tested on the test-bed. The result showed that when the pump pressure is 0.4 MPa and the output shaft speed is 69.75 r/min, the fertilizer consumptions are almost the same at different measurement time, and the picking hole mechanism only sprays liquid fertilizer on the rise to fall travel process of converter's spatial cam. The results show that the proposed spatial cam mechanism could work smoothly that meets the design requirements of spatial cam.
Number of references: 15
Main heading: Fertilizers
Controlled terms: Cams - Computer software - Liquids - Machine design - Machinery - Rotary converters - Visual BASIC
Uncontrolled terms: Kinematics simulation - Liquid fertilizer applicators - Liquid fertilizers - Performance requirements - Simulation - Spatial cam mechanism - Spatial cams - Three-dimensional model
Classification code: 601 Mechanical Design - 601.3 Mechanisms - 704.1 Electric Components - 723 Computer Software, Data Handling and Applications - 723.1.1 Computer Programming Languages - 804 Chemical Products Generally
DOI: 10.6041/j.issn.1000-1298.2015.11.010
Database: Compendex
18. Accession number: 20160301827870
Title: Control strategy and experiment of torque distribution for 4WD vehicle based on SOA
Authors: Chen, Liqing1, 2 ; Hu, Dongbao1; Chen, Wuwei2
Author affiliation: 1 College of Engineering, Anhui Agricultural University, Hefei, China
2 School of Mechanical and Automobile Engineering, Hefei University of Technology, Hefei, China
Corresponding author: Chen, Wuwei (cww@mail.hf.ah.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 369-376
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to promote the overall performance of four wheel drive (4WD) vehicles, its torque distribution was analyzed and a new control strategy was put forward. The 7-DOF dynamic model of vehicle was built based on Matlab/Simulink software, including transmission system model, tire model, and sub-modules, like slip ratio calculation module and tire sideslip angle calculation module. The effects of inter-axial torque distribution ratio and inter-tire torque distribution under the conditions of different roads, speeds and angles on sideslip angle and yaw rate of vehicle were analyzed. The results showed that when the car was steering, the slips of both inter-axial torque and inter-tire torque would have some impacts on the sideslip angle and yaw rate, and the influence of inter-tire distribution was considerably evident. When the front axle gained more torque, the over steering trend could be improved to a certain extent. When the outside tire gained more torque, the steering ability of vehicle was promoted. When the inside tire gained more torque, the over steering trend could be effectively restrained. Taking the linear 2-DOF half vehicle model as the reference object, the torque distribution control system was designed based on the seeker optimization algorithm (SOA) and PID control system. Besides, simulation was carried out with road friction coefficient of 0.7 and 0.3, initial speed of 20 m/s and front wheel angle of 0.1 rad. The result showed that the proposed control strategy can implement the driver's steering intention successfully under different road conditions to improve the driving stability of the vehicle. Based on the NI PXI equipment, hardware in the loop (HIL) experiment platform for torque distribution was established. And according to JASO-C-707 and ISO3888-2 vehicle lane-change performance test criteria, the front wheel angle signal was taken as the input of HIL experiment for validating the proposed control system. The result demonstrated that, compared with the ones without control, the peak value of yaw rate and sideslip angle were reduced by 0.067 rad/s and 0.033 rad, respectively. Besides, the delayed response was also changed for the better. The experiment result verified the effectiveness of the proposed control system.
Number of references: 16
Main heading: All wheel drive vehicles
Controlled terms: Algorithms - Automobile steering equipment - Control systems - Crashworthiness - Friction - Front axles - Hardware - MATLAB - Optimization - Reconfigurable hardware - Roads and streets - Steering - Synthetic apertures - Three term control systems - Tires - Torque - Transportation - Vehicle performance - Vehicle transmissions - Vehicle wheels - Vehicles - Wheels
Uncontrolled terms: Four-wheel drive (4WD) - Four-wheel-drive vehicles - Hardware-in-the-loop tests - Matlab/Simulink software - Road friction coefficients - Seeker optimization algorithm - Torque distribution - Torque distribution control
Classification code: 406.2 Roads and Streets - 601.2 Machine Components - 602.2 Mechanical Transmissions - 605 Small Tools and Hardware - 662.1 Automobiles - 662.4 Automobile and Smaller Vehicle Components - 716.2 Radar Systems and Equipment - 721.3 Computer Circuits - 731.1 Control Systems - 818.5 Rubber Products - 914.1 Accidents and Accident Prevention - 921 Mathematics - 921.5 Optimization Techniques - 931.2 Physical Properties of Gases, Liquids and Solids
DOI: 10.6041/j.issn.1000-1298.2015.11.050
Database: Compendex
19. Accession number: 20160301827845
Title: Local resistance interaction in trickle laterals equipped with integrated on-line emitters
Authors: Wang, Yalin1 ; Zhu, Delan1 ; Zhang, Lin1; Chen, Junying1; Liu, Kenan1
Author affiliation: 1 Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling; Shaanxi, China
Corresponding author: Zhu, Delan (dlzhu@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 187-194
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In drip irrigation design, calculation method of emitter local resistance coefficient is different with different arrangements and the local resistance interaction is existed under some conditions. Local resistance interaction of emitters was appeared when the emitter spacing was less than a critical value, at this time, the emitter local resistance was different from local resistance in independent emitters. Local resistance coefficient would be calculated separately with different methods and different emitter spacings. Based on this, water filling tests of φ16 drip pipe with six kinds of emitters spacings were conducted to investigate the interaction of local resistance in trickle laterals of on-line emitters. Meanwhile, the CFD software was applied on numerical simulation and verification. On this basis, φ20 drip pipeswere simulated. The results showed that the simulatedvalues were in agreement with the experimental values for local resistance interactive coefficient of emitters. The local resistance interactive coefficient reduced with the decreasing emitters spacing. The changes of disturbance range and velocity distribution near the emitters were the main reasons for local resistance interaction in trickle laterals. Local resistance interaction of emitters should be taken into account when the emitter spacing was less than 0.5 m. In this case, the values of interactive coefficient were varied from 0.9 to 1.0.
Number of references: 19
Main heading: Irrigation
Controlled terms: Computational fluid dynamics - Computer simulation - Computer software - Numerical models - Verification
Uncontrolled terms: Critical value - Drip irrigation - Drip irrigation pipes - Experimental values - Interactive coefficient - On-line emitter - Resistance coefficients - Water filling
Classification code: 721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory - 723 Computer Software, Data Handling and Applications - 723.5 Computer Applications - 821.3 Agricultural Methods - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2015.11.025
Database: Compendex
20. Accession number: 20160301827838
Title: Estimation of evapotranspiration optimized by crop coefficient based on dynamic simulation
Authors: Wang, Wei1, 2 ; Wang, Pengxin1, 2 ; Xie, Yi1, 2
Author affiliation: 1 College of Information and Electrical Engineering, China Agricultural University, Beijing, China
2 Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture, Beijing, China
Corresponding author: Wang, Pengxin (wangpx@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 129-136
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The simulative crop coefficients in each growth period of winter wheat were calculated by the potential and actual evapotranspiration of winter wheat during the whole growth period that both simulated with crop growth model. These simulative crop coefficients were compared with the standard crop confidents at different growth stages provided by FAO and the comparison results verified the accuracy of their values and trends. The experience logarithmic model was built based on the leaf area index obtained by both point-based measurement and remote sensing inversion method. The continuous daily regional crop coefficient could be calculated by remotely sensed leaf area index. The ratio of simulated crop coefficient and daily regional crop coefficient could be used as an optimization factor for evapotranspiration model and the evapotranspiration results of simulative crop coefficient before and after optimization in the whole growth period during 2013-2014 in Guanzhong Plain were obtained. Compared with the point-based measured data, it was found that the maximum relative error was reduced to 9.89% from 14.36% after optimization. So the optimized evapotranspiration reversion model was more accurate than the model without optimization, especially under the condition of low plant coverage. The accuracy showed a significant improvement.
Number of references: 23
Main heading: Crops
Controlled terms: Computer simulation - Evapotranspiration - Remote sensing
Uncontrolled terms: Actual evapotranspiration - Crop coefficient - Crop growth model - Different growth stages - Evapotranspiration modeling - Leaf Area Index - Maximum relative errors - Optimization factors
Classification code: 723.5 Computer Applications - 821.4 Agricultural Products
DOI: 10.6041/j.issn.1000-1298.2015.11.018
Database: Compendex
21. Accession number: 20160301827822
Title: Image segmentation of fruits with diseases in natural scenes based on logarithmic similarity constraint Otsu
Authors: Zhao, Yaochi1 ; Hu, Zhuhua1
Author affiliation: 1 College of Information Science and Technology, Hainan University, Haikou, China
Corresponding author: Hu, Zhuhua (eagler_hu@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 9-15
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Due to complex and changeful environment, the image segmentation of fruits with diseases in natural scenes is a difficult problem. A logarithmic similarity constraint Otsu and level set active contour (LSAC) based image segmentation approach of fruits with diseases was proposed in this paper. Considering the complexity and changeableness in natural scenes, the constraint Otsu method for segmenting logarithmic similarity image between diseased fruits and samples was introduced to distinguish diseased fruits and background; because of the local optimality of LSAC, improved distance regularization level set evolution (DRLSE) with adaptive expansion coefficient was used to lead contour to actual position. Firstly, the sample color of fruits with diseases, which included not only health area but also diseases area, was modeled using Gaussian mixture model (GMM), and then the logarithmic similarity between the image of fruits with diseases and model was obtained. Secondly, logarithmic similarity image was segmented with constraint Otsu and then morphology operator was used to filter out noise and interference. Thirdly, least-squares ellipse fitting method was employed to further removal interference and get initial contour for LSAC. Finally, the contour of fruits with diseases was evolved to the actual position taking use of improved DRLSE with adaptive expansion coefficient. The experimental results show that the actual contour of fruits with disease in complex natural scenes can be obtained and the proposed method can provide the basis for the subsequent diseases density estimation and prevention of fruit diseases.
Number of references: 17
Main heading: Image segmentation
Controlled terms: Fruits - Gaussian distribution - Least squares approximations - Numerical methods
Uncontrolled terms: Constraint Otsu - Density estimation - Ellipse fitting method - Expansion coefficients - Gaussian Mixture Model - Improved distance - Level-set evolution - Local optimality
Classification code: 821.4 Agricultural Products - 921.6 Numerical Methods - 922.1 Probability Theory
DOI: 10.6041/j.issn.1000-1298.2015.11.002
Database: Compendex
22. Accession number: 20160301827833
Title: Study on intelligent yield monitoring system of peanut combine harvester
Authors: Zhao, Liqing1, 2 ; Li, Ruichuan3; Gong, Linong2; Gao, Lianxing1 ; Guo, Sen2; Yin, Yuanyuan2
Author affiliation: 1 College of Engineering, Shenyang Agricultural University, Shenyang, China
2 College of Mechanical and Electrical Engineering, Qingdao Agricultural University, Qingdao, China
3 Shandong Wuzheng (Group) Co., Ltd., Rizhao, China
Corresponding author: Gao, Lianxing (lianxing_gao@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 82-87
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 yield monitoring during peanut harvesting, aiming at 4HBLZ-2 type self-propelled peanut combine harvester, an intelligent yield monitoring system was designed. Hardware part included Beidou satellite positioning system, the single chip microprocessor, weight sensor and German ACO contact on-line moisture sensor; it was connected to the host computer through CAN bus interface. Weighing controller adopted 24-bit A/D converter with high precision and digital filter algorithm to ensure the accuracy of weighing data working under vibration environment in the field. Quantitative weighing and mesh subdivision technique were applied to harvester yield monitoring field in this system for the first time, compared with impact-based yield monitoring system, it could reduce more accumulative error caused by peanut harvester vibration working in the field. Software part adopted cross-platform application Qt to achieve the data real-time reception and storage of different sensors, then Beidou data and yield data were processed, and it adopted the way of accumulating different harvesting block yields to establish the mathematical model. The software could query yield data in arbitrary setting blocks, and also realize plane displaying and 3D stereoscopic gradient color displaying. In order to test the stability of yield monitoring system of peanut harvester under working state, yield monitoring system performed vibration test under five different conditions. The absolute relative error of yield was below 2% in condition No. 4 in laboratory and below 5% in field.
Number of references: 18
Main heading: Monitoring
Controlled terms: Analog to digital conversion - Application programs - Computer hardware - Digital filters - Digital storage - Harvesters - Harvesting - Moisture control - Oilseeds - Radio navigation - Stereo image processing - Tracking (position) - Weighing
Uncontrolled terms: 24-bit A/D converter - Cross platform applications - Peanut - Single chip microprocessor - Subdivision technique - Vibration environment - Yield maps - Yield monitor systems
Classification code: 703.2 Electric Filters - 716.3 Radio Systems and Equipment - 722 Computer Systems and Equipment - 722.1 Data Storage, Equipment and Techniques - 723 Computer Software, Data Handling and Applications - 723.2 Data Processing and Image Processing - 731.3 Specific Variables Control - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 943.3 Special Purpose Instruments
DOI: 10.6041/j.issn.1000-1298.2015.11.013
Database: Compendex
23. Accession number: 20160301827869
Title: Layered coordinated control of anti-lock brake for electromagnetic and frictional integrated brake system
Authors: Hu, Donghai1 ; He, Ren1
Author affiliation: 1 School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang, China
Corresponding author: He, Ren (heren@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 360-368
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to study the anti-lock braking control mechanism of the electromagnetic and frictional integrated brake system and improve the anti-lock braking control performance, the anti-lock braking model was established. And the layered coordinated anti-lock control method was put forward according to the braking control features of electromagnetic brake and electronic hydraulic brake. The hardware in the loop simulation platform of electromagnetic and frictional integrated brake system was used to verify the validity of this mathematical model. The comparative study which simulated the dry asphalt, ice and snow and docking pavement was carried out on the anti-lock braking performance of electromagnetic and frictional integrated brake system, high-performance and low-performance electronic hydraulic brake system. Conclusions are obtained as follows: using the electromagnetic brake to control the optimal slip ratio in the process of anti-lock control could fully realize the same anti-lock control effect of high-performance electronic hydraulic brake system with a certain amout of braking intensity provided by low-performance electronic hydraulic brake system. In the design process of the electromagnetic and frictional integrated brake system, the reasonable match of braking performance of electromagnetic brake and electronic hydraulic brake minimizing reliance on the hydraulic control elements of the electronic hydraulic brake would reduce the manufacturing difficulty and cost of the electromagnetic and frictional integrated brake system.
Number of references: 21
Main heading: Anti-lock braking systems
Controlled terms: Braking - Braking performance - Friction - Hydraulic brakes - Hydraulic machinery - Locks (fasteners) - Process control - Traction (friction)
Uncontrolled terms: Anti-lock braking - Antilock brakes - Comparative studies - Electromagnetic brakes - Electronic hydraulic brake systems - Hardware in-the-loop simulation - Hydraulic control - Layered coordinated controls
Classification code: 602 Mechanical Drives and Transmissions - 632.2 Hydraulic Equipment and Machinery - 662.1 Automobiles - 931.1 Mechanics
DOI: 10.6041/j.issn.1000-1298.2015.11.049
Database: Compendex
24. Accession number: 20160301827837
Title: Development of critical nitrogen dilution curve in winter wheat based on leaf dry matter
Authors: Qiang, Shengcai1, 2 ; Zhang, Fucang2, 3 ; Tian, Jianke1; Wu, You1; Yan, Shicheng1; Fan, Junliang1
Author affiliation: 1 College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi, China
2 Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling; Shaanxi, China
3 Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling; Shaanxi, 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: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 121-128
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The Guanzhong Plain of Shaanxi Province is one of the major regions of wheat production in China. Farmers believe that the more nitrogen is applied, the higher yield is obtained. In fact, the excessive application of nitrogen fertilizer does not increase the yield of wheat synchronously, but cause a series of environmental issues. A simple but effective technique for crop nitrogen estimation can lower the production cost and improve the ecological environment. The critical nitrogen concentration can be used to diagnose the crop nitrogen status. Previous researchers mainly developed the critical nitrogen dilution curve based on the aboveground dry matter, whilst the leaf dry matter was used to establish the curve in this study. The field experiments were conducted between 2013 and 2015 to construct and validate the critical nitrogen dilution curve based on leaf dry matter in the vegetative stage in winter wheat. In this study, we selected six winter wheat varieties and set four nitrogen levels N0(0), N1(105 kg/hm2), N2(210 kg/hm2) and N3(315 kg/hm2). Results showed that there were negative power relationships between the critical nitrogen concentration and the maximum leaf dry matter. The nitrogen nutrition index derived from the critical nitrogen dilution curve could be used to evaluate the nitrogen nutrition status of winter wheat. The nitrogen nutrition index increased with the nitrogen rate, with the values between 0.57 and 1.21.The relation between nitrogen nutrition index and relative yield indicate that 105~210 kg/hm2was the optimal nitrogen rate for winter wheat in the Guanzhong Plain. The critical nitrogen dilution curves based on leaf dry matter were successfully used to assess of the nitrogen nutrition status of winter, which can be used for guiding scientific application and diagnose of nitrogen in Guanzhong Plain.
Number of references: 42
Main heading: Nitrogen fertilizers
Controlled terms: Crops - Dilution - Fertilizers - Nitrogen - Nutrition
Uncontrolled terms: Guanzhong Plain - Leaf dry matter - Nitrogen concentrations - Nitrogen nutrition - Winter wheat
Classification code: 461.7 Health Care - 804 Chemical Products Generally - 821.4 Agricultural Products
DOI: 10.6041/j.issn.1000-1298.2015.11.017
Database: Compendex
25. Accession number: 20160301827827
Title: Design and experiment on longitudinal seedling feeding mechanism for rice pot seedling transplanting with ratchet gear
Authors: Na, Mingjun1 ; Song, Zhichao1; Zhou, Maile1; Zhu, Huixuan1; Wang, Qi1; Zhao, Yun1
Author affiliation: 1 College of Engineering, Northeast Agricultural University, Harbin, China
Corresponding author: Zhao, Yun (zhaoyun@neau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 43-48
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to discuss the feasibility of longitudinal seedling feeding mechanism for rice pot seedling transplanting with ratchet gear, the working principle of longitudinal seedling feeding mechanism and the transmission characteristics of ratchet gear mechanism were analyzed. Considering that the pot seedling feeding mechanism of high-speed rotary pot seedling transplanting machine must meet the requirements of steady transmission, accurate transmission ratio, good working reliability, no accumulated error in operation as well as low vibration and noise, the longitudinal seedling feeding mechanism for rice pot seedling transplanting with ratchet gear was designed. The mathematical models of some important geometrical parameters in the design of structure were built and then these parameters were optimized. Besides, the virtual model was also built by using CAD/CAE software. At last, the bench test was carried out. The test result showed that the proposed longitudinal seedling feeding mechanism could meet the working demands of high-speed rotary pot seedling transplanting machine, which provides theory and implement basis for developing this kind of transplanting mechanism.
Number of references: 10
Main heading: Computer aided design
Controlled terms: Agricultural machinery - Computer aided engineering - Feeding - Geometry - Vibrations (mechanical)
Uncontrolled terms: Accumulated errors - Bench tests - Feeding mechanism - Pot seedling - Seedling transplanting - Transmission characteristics - Transmission ratios - Transplanting mechanisms
Classification code: 691.2 Materials Handling Methods - 723.5 Computer Applications - 821.1 Agricultural Machinery and Equipment - 921 Mathematics - 931.1 Mechanics
DOI: 10.6041/j.issn.1000-1298.2015.11.007
Database: Compendex
26. Accession number: 20160301827860
Title: Measurement system of rice flag leaf angle based on android smart phone
Authors: Lu, Wenchao1 ; Zhao, Yong2, 3; Luo, Bin1, 3; Pan, Dayu3, 4; Wang, Cheng1, 3
Author affiliation: 1 Beijing Research Center of Intelligent Equipment for Agriculture, Beijing, China
2 National Research Center of Intelligent Equipment for Agriculture, Beijing, China
3 Key Laboratory of Agri-informatics, Ministry of Agriculture, Beijing, China
4 Beijing Key Laboratory of Intelligent Equipment Technology for Agriculture, Beijing, China
Corresponding author: Wang, Cheng (wangc@nercita.org.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 296-301
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to measure the rice flag leaf angle rapidly and nondestructively, a portable system for measuring rice flag leaf angle based on Android smart phone was developed. The rear camera of the smartphone was used for flag leaf images acquisition, and the flag leaf angle was obtained through image preprocessing, lines detection, K-means clustering and vector method. The interfaces and function modules of system software were designed by using the Android programming technology, which realized the extraction algorithm of rice flag leaf angle using JNI and Android NKD to call OpenCV database in the Android platform. It can complete the operational flows of new test establishing, material information inputting, flag leaf images obtaining, angle value outputting as well as interface saving. 80 plants of rices in four varieties were tested to verify the system performance. The test results demonstrated that, comparing with the measurement results of protractors, the average absolute error of this system was 1.34°, the relative error was 2.7%, and the correlation coefficient between the observed values and actual values was 0.997. It was indicated that the proposed system could effectively measure the rice flag leaf angles.
Number of references: 28
Main heading: Android (operating system)
Controlled terms: Image processing - Interfaces (materials) - Smartphones - Telephone sets
Uncontrolled terms: Android phone - Average absolute error - Correlation coefficient - Extraction algorithms - K-means clustering - Leaf angle - Measurement system - Programming technology
Classification code: 718.1 Telephone Systems and Equipment - 723 Computer Software, Data Handling and Applications - 951 Materials Science
DOI: 10.6041/j.issn.1000-1298.2015.11.040
Database: Compendex
27. Accession number: 20160301827825
Title: Research on the method of seeding quantity detection in potted seedling tray of super rice based on improved shape factor
Authors: Wang, An1 ; Ding, Xiaodi1; Ma, Xu2; Chen, Yingjia3; Zhou, Haibo3, 4
Author affiliation: 1 College of Information Science and Electronic Technology, Jiamusi University, Jiamusi, China
2 College of Engineering, South China Agricultural University, Guangzhou, China
3 College of Mechanical Engineering, Jiamusi University, Jiamusi, China
4 College of Mechanical Engineering, Tianjin University of Technology, Tianjin, China
Corresponding author: Zhou, Haibo (haibo_zhou@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 29-35 and 8
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To achieve super rice seeding according to the numbers of seeds per bunch, it requires precise detect the seeding quantity per bunch in the potted seeding tray. The traditional detection method based on the area and average gray has low detection precision, which could not accurately identify the number of seeds per bunch and reduce adult seedling rate. There is a close relationship between the shape features of seeds in single connected region and the seeding quantity. In this article, a method base on the improved shape factor was presented to detect the seeding quantity per bunch in the potted seedling tray. Firstly, the RGB weighting method was used to gray the color image, the Otsu algorithm was used to binary image processing, morphological filtering algorithm was used to remove the image noise. Secondly, the small image of seeds per punch in potted seedling tray was extracted by the masked location-based technology and the single connected region on the small image was detected. Thirdly, the shape features of each seed were extracted, such as the area and perimeter of single connected region and area of the minimum enclosing circumscribing convex polygon. Then, the improved shape factor was computed according to shape features of each seed. Lastly, the improved shape factor and the area of single connected region were used to classify seed connected regions into cavity (including impurities), one particle, two particles, three particles, or four particles and above. After adding up the particles of each bunch, the seedling tray seeding quantity can be obtained. The result showed that the detection accuracy of the number of seeds between zero particle and three particles in every single connected region was up to 95% and the detection accuracy of the number of seeds more than four particles in every single connected region was up to 90%. The detection accuracy of the number of seeds in every bunch was up to 93%. Each image was processed less than 0.518 seconds. It's proved that the method of potted seedlings tray sowing quantity detection meets the requirement of automated rice sowing test line. The research result can provide reference for the follow-up work of reseed.
Number of references: 22
Main heading: Image processing
Controlled terms: Color image processing - Information dissemination
Uncontrolled terms: Detection accuracy - Detection precision - Location-based technologies - Morphological filtering - Potted seedling tray - Precision seeding - Quality detection - Shape factor
Classification code: 741.1 Light/Optics - 903.2 Information Dissemination
DOI: 10.6041/j.issn.1000-1298.2015.11.005
Database: Compendex
28. Accession number: 20160301827834
Title: Multifunctional modular full-feeding peanut picking testing device
Authors: Guan, Meng1 ; Chen, Zhongyu1, 2; Gao, Lianxing1 ; Liu, Zhixia1; Cheng, Jin3; Zhang, Xudong3
Author affiliation: 1 College of Engineering, Shenyang Agricultural University, Shenyang, China
2 Yancheng Institute of Industry Technology, Yancheng, China
3 Liaoning Institute of Agricultural Mechanization, Shenyang, China
Corresponding author: Gao, Lianxing (lianxing_gao@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 88-94
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to further study the operational principle of all forms of peanut picker and picking component, explore the peanut pods damage mechanism, distribution regularity and peanut plant dynamics situation, and then optimize the structure and parameters of peanut picker, a multifunctional modular full-feeding peanut picking testing device was designed. It mainly composed of frame, motor, transmission system, picking system, cleaning system, variable speed and control system as well as pod distribution test system. As a peanut picking testing device, it has the following functions: by changing and controlling the moving direction of the peanut plants, seven different kinds of feeding and picking program with tangential and axial cylinder could be achieved, which are tangential flow single cylinder, axial flow single cylinder, tangential flow double-cylinder, tangential-axial flow double-cylinder, tangential flow double-cylinder, double tangential-horizontal axial flow three cylinders and tangential double axial flow three cylinders. And the picking cylinders and the speed between them could be adjusted through the speed regulating of the inverter drive combined with mechanical transmission. In addition, the distribution of peanut pods in each picking mechanism would be studied with the divided material collection box. Besides, it showed that the device could be used to carry out the performance tests of picking with different picking parts and the combination of tangential and axial cylinders. And the main parameters were as follows, rotational speed of 200~800 r/min, picking gap of 25~50 mm, and the maximum feeding quality of 5 kg/s.
Number of references: 23
Main heading: Oilseeds
Controlled terms: Axial flow - Cylinders (shapes) - Feeding - Software testing
Uncontrolled terms: Distribution regularities - Full-feeding modular - Mechanical transmission - Operational principles - Peanut - Picking - Testing device - Transmission systems
Classification code: 631.1 Fluid Flow, General - 691.2 Materials Handling Methods - 723.5 Computer Applications - 821.4 Agricultural Products
DOI: 10.6041/j.issn.1000-1298.2015.11.014
Database: Compendex
29. Accession number: 20160301827868
Title: Responses of vegetation to change of meteorological factors in agricultural-pastoral area of northern China
Authors: Su, Wei1, 2 ; Liu, Xiaoxuan1, 2; Luo, Qian1, 2; Chang, Shuqi2; Zhang, Xiaodong2
Author affiliation: 1 Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture, Beijing, China
2 College of Information and Electrical Engineering, China Agricultural University, Beijing, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 352-359
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Agricultural-pastoral area of Northern China is a ecologically fragile belt. Climate change has increased the risk of ecological vulnerability in this region. Besides, it has made the ecological vulnerability more serious because of the pattern of alternant farming and animal husbandry. Therefore, the aim of this paper was to study the responses of vegetation to the change of meteorological factors in agricultural-pastoral areas of Northern China during 2001-2013, using correlation analysis method. First, temporal and spatial variation rules of vegetation growing were explored based on NDVI (Normalized differential vegetation index) and GPP (Gross primary productivity) data. Then, variation rules of temperature and precipitation were found. Finally, we analyzed the responses of vegetation to the change of meteorological factors of different vegetation types using Pearson correlation coefficient method. The results showed that in the research area, vegetation ecological situation was negatively correlated with temperature and positively correlated with precipitation in growing season, while the correlations were on the contrast in non-growing season. The vegetation ecological situation was positively correlated with temperature and negatively correlated with precipitation. Because the higher temperature will inhibit the vegetation growth than the optimum temperature, while the precipitation in semi-arid area could promote the growth of vegetation. However, temperature was very low in non-growing season, so the increase in temperature promotes vegetation ecological situation obviously and the response of vegetation to precipitation was not obvious because precipitation was not the main factor influencing the vegetation ecological situation in this period.
Number of references: 20
Main heading: Vegetation
Controlled terms: Agriculture - Climate change - Correlation methods - Ecology - Photosynthesis - Phytoplankton
Uncontrolled terms: Correlation coefficient method - Gross primary productivity - Meteorological factors - Normalized differential vegetation indices - Northern China
Classification code: 443.1 Atmospheric Properties - 454.3 Ecology and Ecosystems - 471 Marine Science and Oceanography - 741.1 Light/Optics - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 922.2 Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2015.11.048
Database: Compendex
30. Accession number: 20160301827816
Title: Experiment on effects of methanol temperature and pressure on spray
Authors: Yao, Chunde1 ; Chen, Zhifang1; Wu, Taoyang1; Hu, Jiangtao1; Yang, Xian1; Chen, Shixing1
Author affiliation: 1 State Key Laboratory of Engines, Tianjin University, Tianjin, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 377-382
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to understand the spray characteristics with methanol temperature and spray pressure changes, a high speed camera and 3D laser phase Doppler particle analyzer(PDPA) was used to research the methanol spray as fuel temperature was 25, 50, 60, 70 and 80 respectively, and methanol injection pressure was 0.3 MPa, 0.4 MPa, 0.5 MPa respectively. The results show that, with the increase of methanol temperature, the spray atomization quality was improved, the liquid core of methanol jet was reduced, and the spray droplet Sauter mean diameter (SMD) was decreased, meanwhile, the location of main jet zone was expanded from 7 mm to 10 mm. At the same time, spray penetration and the velocity of droplet was first increased and then decreased with the increase of methanol temperature, and when the methanol temperature reached 70, they both had the maximum value. When the temperature of methanol remained the same, the increase of injection pressure can improve the velocity of spray droplets, which contributed to the increase of penetration, moreover, the droplet Sauter mean diameter (SMD) decreased obviously. Thus, in the application of methanol fumigated diesel engine, it is an effective measure to improve methanol atomization by increasing methanol temperature and injection pressure to around 70 and 0.5 MPa, respectively.
Number of references: 16
Main heading: Methanol
Controlled terms: Atomization - Cameras - Diesel engines - Drop breakup - Drops - High speed cameras - Jets - Pressure - Spraying - Temperature - Two phase flow
Uncontrolled terms: Effective measures - Injection pressures - Methanol injection - Phase Doppler particle analyzer - Sauter mean diameter (SMD) - Spray atomization - Spray characteristics - Temperature and pressures
Classification code: 612.2 Diesel Engines - 631.1 Fluid Flow, General - 641.1 Thermodynamics - 742.2 Photographic Equipment - 802.3 Chemical Operations - 804.1 Organic Compounds - 931.1 Mechanics - 931.2 Physical Properties of Gases, Liquids and Solids
DOI: 10.6041/j.issn.1000-1298.2015.11.051
Database: Compendex
31. Accession number: 20160301827862
Title: Network interworking gateway design for video of vegetables harmed by pests
Authors: Li, Xinxing1 ; Li, Hui1; Ma, Yunfei2; Liu, Chundi1, 3; Fu, Zetian3, 4; Zhang, Lingxian1, 3
Author affiliation: 1 College of Information and Electrical Engineering, China Agricultural University, Beijing, China
2 Yantai Research Institute, China Agricultural University, Yantai, China
3 Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture, Beijing, China
4 Beijing Laboratory of Food Quality and Safety, Beijing, 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: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 309-315
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Network interworking is a key technological bottleneck for the acquisition of mobile video. To solve this problem, based on the studies of video segmentation, compression, annotation and retrieval, the network interworking gateway for mobile video acquisition was designed which can eventually achieve the acquisition of mobile video of vegetables harmed by pests. Firstly, the 3G-324M and H. 323 network protocol of video telephone network and IP network were analyzed in detail. Then, an interworking gateway of 3G-324M and H. 323 was designed, which included signal gateway and media gateway. Signal gateway is responsible for handling the signal and realizing the control and communication of call level and system level between video telephone network and IP network. Media gateway is responsible for data transmission, realizing the control and communication of media level and data level between video telephone network and IP network. Finally, based on the previous research foundation and the network interworking gateway designed in this paper, a mobile acquisition model was built, and the mobile video acquisition of vegetables harmed by pests was realized. The comparative experiment was carried out on the video acquisition model. Comparing with the traditional methods, it proved that the proposed network interworking gateway and video acquisition model processed theoretical and practical value.
Number of references: 15
Main heading: Gateways (computer networks)
Controlled terms: Internet protocols - Network protocols - Reconfigurable hardware - Telephone circuits - Telephone sets - Television - Vegetables
Uncontrolled terms: Acquisition models - Comparative experiments - Interworking gateway - Mobile acquisition - Network interworking - Video - Video acquisitions - Video segmentation
Classification code: 716.4 Television Systems and Equipment - 718.1 Telephone Systems and Equipment - 721.3 Computer Circuits - 723 Computer Software, Data Handling and Applications - 821.4 Agricultural Products
DOI: 10.6041/j.issn.1000-1298.2015.11.042
Database: Compendex
32. Accession number: 20160301827820
Title: Double-SIMP method for gray-scale elements suppression in topology optimization
Authors: Zhang, Zhifei1, 2 ; Xu, Wei2; Xu, Zhongming1, 2; He, Yansong1, 2
Author affiliation: 1 State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, China
2 School of Automotive Engineering, Chongqing University, Chongqing, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 405-410
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To suppress gray-scale elements in topology optimization for continuum structures, a new double-SIMP (Solid isotropic microstructures with penalization) method was presented based on standard SIMP approaches. It is found that the SIMP method without sensitivity filter could suppress gray-scale elements in the topological structures. Therefore, a two-pass method was presented. Firstly, the standard SIMP method with sensitivity filter was employed to generate intermediate design variables; secondly, the SIMP method without sensitivity filter was adopted to update the intermediate design variables again and produce the final solution. Taking simple supported beam as an example, it is successful to apply double-SIMP method in the topological design of flexible body. According to the results, gray-scale elements were suppressed successfully. What is more, the results showed that smaller structural compliance could be obtained through double-SIMP method. The mesh-dependence problem of double-SIMP method was also better. Besides, to suppress the gray-scale elements, the standard SIMP method would need to increase the penalty factor. However, the bigger the penalty factor was, the more the iterations were. The double-SIMP method didn't rely on the penalty factor. Compared with standard SIMP method, there were not extra parameters and constraints in the double-SIMP method. As a consequence, the applicability is similar between the two kinds of methods.
Number of references: 22
Main heading: Structural optimization
Controlled terms: Microstructure - Shape optimization - Topology
Uncontrolled terms: Continuum structures - Design variables - Gray scale - Isotropic microstructures - Sensitivity filter - Simple supported beams - Topological design - Topological structure
Classification code: 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory - 921.5 Optimization Techniques - 951 Materials Science
DOI: 10.6041/j.issn.1000-1298.2015.11.055
Database: Compendex
33. Accession number: 20160301827850
Title: Progress of observation and prediction for foodborne pathogen single cell
Authors: Dong, Qingli1 ; Liu, Yangtai1; Su, Liang2; Wang, Xin1; Liu, Qing1; Ding, Tian3
Author affiliation: 1 School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai, China
2 China National Center for Food Safety Risk Assessment, Beijing, China
3 College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 221-229
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The research on the growth of the foodborne pathogen in the single cell level is popular and necessary for its random and variability, which is different from it in the population level. Based on the related research literatures, the observation methods of the pathogen single cell are summarized as indirect and direct methods. The indirect method is based on the turbidity method and theoretical hypothesis, meanwhile, the direct method is using the optical devices to record the division process of the cells. For the character of the growth in single cell level, the single cell growth prediction model should be built on the stochastic model rather than the deterministic model used in the traditional predictive microbiology. Modelling the stochastic division process by the individual-based method makes it possible to explain the relations between the single cell and its living environments. The observation and prediction for foodborne pathogen single cell is the foundation to control the risk of the food with low-contamination. Analysis indicates that the pathogen single cell growth prediction tends to be combined with food risk assessment.
Number of references: 64
Main heading: Food microbiology
Controlled terms: Cell growth - Cells - Cytology - Forecasting - Growth kinetics - Microbiology - Microorganisms - Pathogens - Population statistics - Risk assessment - Stochastic control systems - Stochastic models - Stochastic systems
Uncontrolled terms: Deterministic modeling - Food-borne pathogens - Individual-based methods - Living environment - Observation method - Predictive micro-biology - Single cells - Single-cell level
Classification code: 461 Bioengineering and Biology - 731.1 Control Systems - 914.1 Accidents and Accident Prevention - 922.1 Probability Theory
DOI: 10.6041/j.issn.1000-1298.2015.11.030
Database: Compendex
34. Accession number: 20160301827857
Title: Wavelength selecting methods of NIRS predicting model of paddy 1 000-grain weight
Authors: Yu, Haiming1 ; Li, Shi1; Wu, Wei1; Ye, Changwen1; Kang, Rui1; Chen, Cairong1
Author affiliation: 1 College of Engineering, Nanjing Agricultural University, Nanjing, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 275-279
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Effect of wavelength selecting method on the predictive ability of NIR spectroscopy models was studied. Predictive models for 1 000-grain weight of paddy based on near infrared (NIR) spectra were developed using partial least square (PLS) regression in the wavelength region between 600 nm and 1 100 nm. The resultant standard error of cross-validation and standard error of prediction were 1.809 and 1.756, respectively, with corresponding coefficients of determination of 0.714 for cross-validation and 0.659 for prediction. The wavelength regions in which the calibrations for 1 000-grain weight would be developed were optiminized using six methods: the regression coefficient, mutual information, regression, uninformative variables elimination, genetic algorithm and interval partial least square before establishing the calibrations. Then the NIR-prediction models for 1 000-grain weight were developed based on the selected wavelength regions in the same way as the above. Experimental results showed that, after wavelength optimization, the wavelength regions used in model developing significantly decreased, and SEP reduced while Rv2and Rp2increased. Of them, after the wavelength selection was carried out by using the genetic algorithm, the developed model was of the highest Rv2and Rp2. Moreover, the SEP were decreased by 9.50% and 5.72%, respectively. This suggested that predictive ability of the NIR models for 1 000-grain weight prediction can be improved after wavelength optimization.
Number of references: 13
Main heading: Least squares approximations
Controlled terms: Calibration - Forecasting - Genetic algorithms - Infrared devices - Near infrared spectroscopy - Optimization - Regression analysis
Uncontrolled terms: Interval partial least squares - Near infrared spectra - NIRS - Paddy 1 000-grain weight - Partial least-square regression - Regression coefficient - Standard error of prediction - Wavelength optimization
Classification code: 921.5 Optimization Techniques - 921.6 Numerical Methods - 922.2 Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2015.11.037
Database: Compendex
35. Accession number: 20160301827836
Title: Estimation of leaf area index of winter wheat based on akaike's information criterion
Authors: Yang, Fuqin1, 2 ; Feng, Haikuan2, 3 ; Li, Zhenhai3, 4; Jin, Xiuliang3, 4; Yang, Guijun2, 3; Dai, Huayang1
Author affiliation: 1 College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing, China
2 National Engineering Research Center for Information Technology in Agriculture, Beijing, China
3 Key Laboratory for Information Technologies in Agriculture, Ministry of Agriculture, Beijing, China
4 Beijing Engineering Research Center of Agricultural Internet of Things, Beijing, China
Corresponding author: Feng, Haikuan (fenghaikuan123@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 112-120 and 164
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Leaf area index (LAI) is an important parameter for evaluating the growth status and yield prediction of winter wheat. Spectral reflectance of leaves and concurrent LAI parameters of samples in Tongzhou and Shunyi Districts, Beijing City, China, were acquired during 2008/2009 winter wheat growth season. The correlation coefficient (|r|) -Akaike's information criterion (AIC), grey relational analysis (GRA)-AIC, variable importance for projection (VIP)-AIC, VIP-predictive residual error sum of square (PRESS) were integrated with partial least squares regression for estimating LAI, and the estimation models of optimal LAI were presented by using AIC and compared with traditional PRESS function. The results indicated that the R2of |r|-PLS-AIC, GRA-PLS-AIC, VIP-PLS-AIC and VIP-PLS-PRESS models were 0.72, 0.67, 0.73 and 0.70, respectively. The VIP-PLS-AIC had higher predictive ability for winter wheat LAI than VIP-PLS-PRESS. Considering time domain characteristics of LAI, the relevant data acquired in Tongzhou and Shunyi Districts, Beijing City, China, during 2009/2010 winter wheat growth seasons were used to validate the models in different years. The results showed that VIP-PLS-AIC with RMSE of 0.81 had higher predictive ability than |r|-PLS-AIC with RMSE of 0.87, GRA-PLS-AIC with RMSE of 0.96 and VIP-PLS-PRESS with RMSE of 0.83.The results indicated that AIC could not only obtain the estimation model of optimal LAI at the same year, but also could be applied to the LAI detection in different years.
Number of references: 35
Main heading: Presses (machine tools)
Controlled terms: Crops - Estimation - Least squares approximations - Time domain analysis
Uncontrolled terms: Akaike's information criterions - Correlation coefficient - Grey relational analyses (GRA) - Leaf Area Index - Partial least squares regression - Spectral reflectances - Time domain characteristics - Winter wheat
Classification code: 603.1 Machine Tools, General - 821.4 Agricultural Products - 921 Mathematics - 921.6 Numerical Methods
DOI: 10.6041/j.issn.1000-1298.2015.11.016
Database: Compendex
36. Accession number: 20160301827865
Title: Denoising method of log energy entropy quadratic wavelet packet in sows' lactating vocalization
Authors: Yan, Li1, 2 ; Shen, Mingxia1 ; Liu, Longshen1; Sun, Xin3; Yao, Wen4; Xu, Yani1
Author affiliation: 1 College of Engineering, Nanjing Agricultural University, Nanjing, China
2 College of Information and Technology, Heilongjiang Bayi Agricultural University, Daqing, China
3 School of Basic Medical Sciences, Harbin Medical University, Harbin, China
4 College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China
Corresponding author: Shen, Mingxia (mingxia@njau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 330-336
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Nurse grunting of lactating sows, as a signal to attract piglet sucking, the frequency of which has a fixed relationship with the motive of sow's milk secretion, will benefit for building a feeding pattern between the sow and its' piglets. As an important trait of good maternal behavior, nurse grunting can be one of the criterion in maternal behavior. However, the noises from environment and piglets screams often disturb the recognition and extraction of time- and frequency-domain characteristics. The nurse grunting of Xiaomeishan sows combining with the noises from environmental interference noise and piglets' screaming calls were used in this study. Firstly, according to the energy of noise is even-distributed in the frequency domain, which corresponds to the maximum entropy characteristics, the layers of wavelet packet was selected, and the entropy of corresponding wavelet packet coefficient was calculated. Secondly, the power ratio was calculated to distinguish the types of noise. Finally, the different denoising methods in sound signal with different kinds of noise were compared. The results showed that the main frequency range of a nurse grunting was ranged from 0 Hz to 800 Hz, while the frequency of piglets' screaming calls was ranged from 1 000 Hz to 8 000 Hz, and the frequency of other interference noise was distributed from 0 Hz to 8 000 Hz. The power ratios of 0 Hz to 1 000 Hz in pure nurse grunting without noise, with environmental noise, and with screaming calls were 1, between 0.85 to 0.97, and between 0 to 0.8, respectively. Meanwhile, with db10 as a wavelet packet basis, the 5 layers and 3 layers wavelet packet transform were used, the main noise ranging from 0 Hz to 8 000 Hz and residual noise ranging from 1 000 Hz to 8 000 Hz can be removed. Therefore, the reconstructed signal can be used to analyze the feature of nurse grunting in Xiaomeishan sows.
Number of references: 22
Main heading: Wavelet transforms
Controlled terms: Entropy - Frequency domain analysis - Nursing - Packet networks
Uncontrolled terms: De-Noise - Energy-entropy - Environmental noise - Sow - Wavelet package transform
Classification code: 461.7 Health Care - 641.1 Thermodynamics - 921.3 Mathematical Transformations
DOI: 10.6041/j.issn.1000-1298.2015.11.045
Database: Compendex
37. Accession number: 20160301827839
Title: Co-ordination of environmental factors in driving and regulating transpiration rate of greenhouse grown muskmelon
Authors: Zhang, Dalong1 ; Zhang, Zhongdian1; Li, Jianming1
Author affiliation: 1 College of Horticulture, Northwest A&F University, Yangling; Shaanxi, China
Corresponding author: Li, Jianming (lijianming66@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 137-144
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Based on the experimental factors like soil moisture, air temperature, relative humidity and solar radiation, a composite quadratic orthogonal regressive rotation design of four factors and five levels was adopted to characterize the co-ordination of environmental factors in driving and regulating transpiration rate of greenhouse grown muskmelon. Soil moisture was maintained by using weighing method, and environmental factors were controlled by the chamber of a portable photosynthesis system (Li-6400; LI-COR). Transpiration rate and stomatal conductance were measured under different combinations of environmental factors. Characterizations of main effect, single effect and marginal effect for each environmental factor were determined by using the environmental data. The results showed that: all of the environmental factors were positively correlated with transpiration rate except relative humidity. Correlation between transpiration rate and soil moisture, temperature can be described in a linear function, respectively. But solar radiation and relative humidity exhibited parabolic functions with transpiration rate. Soil moisture and temperature showed a stable positive marginal effect on transpiration rate with increasing treatment levels, while solar radiation and relative humidity showed linear functions with a positive and negative slope, respectively. Marginal effects of solar radiation and relative humidity were divided into positive and negative with threshold treatment levels of -0.69 and -1.49.Considering the tight coordination between environmental factors in regulating transpiration rate, a quantitative framework was presented to characterize and quantify pathways of each environmental factor. Vapour pressure deficit (VPD) was an important intermediary factor in modulating driving force of other environment factors, which performed a dominant role in determining leaf transpiration rate at the instantaneous scale.
Number of references: 37
Main heading: Transpiration
Controlled terms: Greenhouses - Moisture - Radiation effects - Soil moisture - Soils - Solar radiation
Uncontrolled terms: Environment factors - Environmental factors - Experimental factors - Muskmelon - Orthogonal experiment - Quantitative frameworks - Stomatal conductance - Vapour pressure deficits
Classification code: 461.9 Biology - 483.1 Soils and Soil Mechanics - 657.1 Solar Energy and Phenomena - 821.6 Farm Buildings and Other Structures
DOI: 10.6041/j.issn.1000-1298.2015.11.019
Database: Compendex
38. Accession number: 20160301827861
Title: Design and experiment of automatic measuring system for forest canopy structure parameters
Authors: Wen, Yibo1 ; Fan, Wenyi1 ; Chang, Ying1
Author affiliation: 1 College of Forestry, Northeast Forestry University, Harbin, China
Corresponding author: Fan, Wenyi (fanwy@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 302-308
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To perceive long-term leaf area index, foliage clumping index and canopy density index data of forest canopy structure parameters, an automatic instrument was designed. With this instrument, an effective solution was provided to obtain canopy structural parameter for forest management plan and to collect long-term data for scientific research. The instrument was made up of measuring vehicle, designed orbit and solar energy system. The measuring vehicle was controlled by single chip microcomputer to complete the assigned tasks, such as collecting intensity distribution data of orbital light and obtaining probability distribution function of light spots in different lengths. A large flare elimination method and Bell's Law were used to calculate the forest canopy structure parameters. Leaf area index was measured via a non-destructive optical method, which was applied to crown canopy leaf area index long-term measurement, and then gain the long time serial data. The leaves of 32 plots of experimental forest were tested to measure the accuracy and solver of this method. Results showed that the effective leaf area index obtained via this instrument was similar to LAI-2200 measurement with correlation coefficient of 0.832 5, and canopy density index was consistent with what traditional methods did.
Number of references: 25
Main heading: Forestry
Controlled terms: Data acquisition - Distribution functions - Probability distributions - Solar energy
Uncontrolled terms: Automatic measuring system - Canopy parameter - Correlation coefficient - Forest - Forest canopy structure - Forest management plans - Long-term measurements - Single chip microcomputers
Classification code: 657.1 Solar Energy and Phenomena - 723.2 Data Processing and Image Processing - 922.1 Probability Theory
DOI: 10.6041/j.issn.1000-1298.2015.11.041
Database: Compendex
39. Accession number: 20160301827847
Title: Kinetic study on conversion of glucose to 5-hydroxymethylfurfural in different solvents
Authors: Lin, Haizhou1 ; Sun, Wuxing1; Ru, Bin1; Chen, Jingping1; Wang, Shurong1
Author affiliation: 1 State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, China
Corresponding author: Wang, Shurong (srwang@zju.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 201-207
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: As a high value-added platform chemical in biorefinery, 5-hydroxymethylfurfural (HMF) can undergo conversion to various fine chemicals and high quality liquid fuels. Glucose decomposition in liquid-phase system is the conventional route for HMF production. To get insights into the effects of different solvents on HMF formation, the conversion of glucose in three different solvents, including water, dimethylsulfoxide (DMSO), and water-DMSO mixture, was performed over the temperature range of 100 to 200. The results showed that the yield of HMF in water-DMSO mixture at 175 was up to 20.7%, which was much higher than that in pure water (11.86%) and DMSO (10.0%). A reaction model involving the formation pathways of HMF, levulinic acid (LA) and humin was used to analyze the kinetics of glucose decomposition, and the obtained kinetic parameters predicted experimental results very well. It was found that DMSO altered the path of glucose isomerization, resulting in the formation of fructose and galactose. Compared with the enhancement of HMF activity in water, DMSO suppressed the further reaction of HMF to form LA and humin. Moreover, the properties of the humins generated in the three solvents were characterized, and the corresponding formation mechanisms were discussed.
Number of references: 28
Main heading: Solvents
Controlled terms: Glucose - Indicators (chemical) - Kinetics - Mixtures - Reaction kinetics
Uncontrolled terms: 5 hydroxymethyl furfurals - Formation mechanism - Formation pathways - Glucose decomposition - Glucose isomerization - Liquid phase systems - Solvent effects - Water-dmso mixtures
Classification code: 801 Chemistry - 802.2 Chemical Reactions - 803 Chemical Agents and Basic Industrial Chemicals - 804 Chemical Products Generally - 804.1 Organic Compounds - 931 Classical Physics; Quantum Theory; Relativity
DOI: 10.6041/j.issn.1000-1298.2015.11.027
Database: Compendex
40. Accession number: 20160301827842
Title: Tillage erosion impacts on soil aggregate associated carbon in mountainous region slope farmland of northern Sichuan
Authors: Fan, Hongzhu1, 2 ; Zhang, Jianhui1 ; Wang, Yong1, 2; Jiang, Song3
Author affiliation: 1 Institute of Maintain Hazards and Environment, Chinese Academy of Science, Chengdu, China
2 University of Chinese Academy of Sciences, Beijing, China
3 Soil and Fertilizer Institute, Sichuan Academy of Agricultural Sciences, Chengdu, China
Corresponding author: Zhang, Jianhui (zjh@imde.ac.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 157-164
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to better understand the effects of tillage erosion on carbon cycle in the sloping farmland, responses of soil organic carbon and aggregate associated carbon to soil erosion were explored in a mountainous region of northern Sichuan Basin, southwest China, with137Cs tracer and laboratory analysis method. The results showed soil loss was found in upslope where137Cs concentrations were lower (soil erosion rates were greater), whereas soil deposit occurred in the bottom of sloping farmland where137Cs concentrations were higher (soil erosion rates were less). Not only water erosion but also tillage erosion contributed to soil losses. Tillage erosion played an important role in sloping farmland soil redistribution, average tillage erosion rate in upslope was 63.22 t/(hm2?a), occupying 94.61% of total soil erosion. Soil deposit rate was 23.94 t/(hm2?a)in low positions. Soil erosion resulted in the lowest >2 000 μm, 250~2 000 μm and 53~250 μm size aggregates, and created the highest >53 μm aggregate fraction in upslope. Meanwhile, soil organic carbon and aggregate associated carbon content and stock were significantly lower in upslope positions than these in bottom slope positions. There was significant correlation between soil organic carbon, content of aggregate associated carbon and137Cs inventory, suggesting that soils were more fertile in bottom positions than in top positions due to soil redistribution by soil erosion. Therefore, fertilization management strategies should involve spatial variation of soil properties in purple soil of hilly sloping farmland.
Number of references: 24
Main heading: Soils
Controlled terms: Aggregates - Agricultural machinery - Agriculture - Cesium - Deposits - Erosion - Farms - Organic carbon - Soil testing
Uncontrolled terms: Carbon content - Sichuan - Sloping farmlands - Soil aggregate - Tillage erosion
Classification code: 406 Highway Engineering - 483.1 Soils and Soil Mechanics - 549.1 Alkali Metals - 804.1 Organic Compounds - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 821.1 Agricultural Machinery and Equipment
DOI: 10.6041/j.issn.1000-1298.2015.11.022
Database: Compendex
41. Accession number: 20160301827858
Title: Effect of air-inflow velocity on cooling efficiency during forced-air precooling of apples
Authors: Han, Jiawei1, 2 ; Zhao, Chunjiang1, 2 ; Yang, Xinting2; Qian, Jianping2; Xing, Bin2; Fan, Beilei2
Author affiliation: 1 College of Computer Science and Technology, Beijing University of Technology, Beijing, China
2 National Engineering Research Center for Information Technology in Agriculture, Beijing, China
Corresponding author: Zhao, Chunjiang (zhaocj@nercita.org.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 280-289
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To ensure the quality and safety, and extend storage and shelf life of horticultural products across the entire cold-chain, a critical step in the postharvest cold chain is rapid precooling after harvest to remove field heat. This work established a three-dimensional mathematical model of air-inflow and heat transfer for analyzing the aerodynamic and thermal forced-convection cooling of vented packages simultaneously. A direct model that uses the explicit geometry of stacked products in boxes was developed earlier and was used to study the local and average air-inflow through stacks of horticultural products (the package wall, trays and apples). This study is based on an existing two-layer corrugated box for precooling fresh apples. We accounted for the heat of respiration, transpiration, condensation and convective heat flow inside the produce zone. The results show that a reasonable increasing cooling rate and uniformity are obtained with an increase in air-inflow velocity to 2.5 m/s; any further increase in air-inflow velocity simply wastes energy because it leads to a relatively low increase in cooling rate and uniformity. The model was verified by comparing its results to those of experiments. The predicted results were consistent with the measured results. The maximum temperature deviation was less than 1.5, and the maximum root mean square error and average relative error for produce temperature were 1.179 and 13.6%, respectively. This research thus provides a reliable theoretical basis for improving air-inflow and produce-temperature uniformity and minimizing energy consumption during forced-convection cooling of produce.
Number of references: 31
Main heading: Air
Controlled terms: Chains - Computational fluid dynamics - Cooling - Energy utilization - Forced convection - Fruits - Heat convection - Heat transfer - Mean square error - Velocity
Uncontrolled terms: Air inflow - Apple - Average relative error - Forced air cooling - Horticultural products - Root mean square errors - Temperature uniformity - Three-dimensional mathematical models
Classification code: 525.3 Energy Utilization - 602.1 Mechanical Drives - 641.2 Heat Transfer - 723.5 Computer Applications - 804 Chemical Products Generally - 821.4 Agricultural Products - 922.2 Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2015.11.038
Database: Compendex
42. Accession number: 20160301827841
Title: Temporal and spatial distribution of ecosystem service value in beijing based on torque balance point method
Authors: Li, Hong1 ; Tang, Xiumei2, 3; Zhao, Chunjiang2, 3 ; Pan, Yuchun2, 3; Hao, Xingyao2, 3; Gao, Yunbing2, 3
Author affiliation: 1 Beijing Key Laboratory of Precision Forestry, Beijing Forestry University, Beijing, China
2 Beijing Research Center for Information Technology in Agriculture, Beijing, China
3 National Engineering Research Center for Information Technology in Agriculture, Beijing, China
Corresponding author: Zhao, Chunjiang (zhaocj@nercita.org.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 151-156
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: This study mainly assesses land use ecosystem service values in Beijing City during the year of 1993, 2001 and 2007.It calculated the gravity center changes of ecosystem service values based on the torque balance point method, and also analyzed the spatial and temporal variation of ecosystem service value distribution in Beijing City. The results indicate that: the ecosystem service value in Beijing City increases from 29.769 billion Yuan in 1993 to 29.905 billion Yuan in 2001, and then the value decreases to 29.212 billion Yuan in 2007. The transmission of gravity center in ecosystem service values is due to the changes of land use. The central values of cultivated land, grassland, wetland have moved from south to north during 1993-2007, which enhanced the change of the total value of gravity center. For instance, the gravities of park green land and forest were always changed from north to south. The changes of gravity for different functional values of ecosystem services illustrate that the gravity center values from waste material, climate regulation, gas regulation, food production, soul formation and conservation, and entertainment culture, move from south to north, and the gravity of raw materials is opposite. For biological diversity protection, the gravity center shifts from west to east. For water conservation, the center goes from north to south and then to north again during the three-year period. The paper provides accurate information for municipal government decision-making, and formalises ecological and environmental protection related policies in Beijing City.
Number of references: 22
Main heading: Ecosystems
Controlled terms: Decision making - Ecology - Land use - Torque - Water conservation
Uncontrolled terms: Ecosystem service values - Ecosystem services - Gravity centers - Municipal government - Spatial and temporal variation - Temporal and spatial distribution - Temporal and spatial variation - Torque balance
Classification code: 403 Urban and Regional Planning and Development - 444 Water Resources - 454.3 Ecology and Ecosystems - 912.2 Management - 931.2 Physical Properties of Gases, Liquids and Solids
DOI: 10.6041/j.issn.1000-1298.2015.11.021
Database: Compendex
43. Accession number: 20160301827854
Title: Application of hyperspectral imaging for detection of defective features in nectarine fruit
Authors: Huang, Fenghua1, 2 ; Zhang, Shujuan2 ; Yang, Yi2; Man, Zun2; Zhang, Xuehao2; Wu, Yuxiang3
Author affiliation: 1 College of Information Science and Engineering, Shanxi Agricultural University, Taigu, China
2 College of Engineering, Shanxi Agricultural University, Taigu, China
3 College of Agronomy, Shanxi Agricultural University, Taigu, China
Corresponding author: Zhang, Shujuan (zsujuan1@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 252-259
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Hyperspectral imaging, an emerging analytical technology for quality and safety inspections of agricultural and sideline products, combines the advantages of digital image or computer vision with spectroscopy technology in the whole system. Hyperspectral imaging can simultaneously acquire both spatial and spectral information, which deliver chemical, structural and functional information from the samples. In this work, hyperspectral imaging technology was applied to determine a classifier that can be used for nondestructive defection of the defective features in “No. 9 of Zhongyou” nectarine fruit. There were 400 samples from a nectarine planting garden in the Wanan Village in Yuncheng City of Shanxi Province, China, including: crack(50), peel spots(50), malformation(50), hidden damage(50) and normal(200) samples. Hyperspectral imaging technology covered the range of 420~1 000 nm was employed to detect defects (crack, peel spots, malformation and hidden damage) of nectarine fruit. 400 RGB images were acquired through a total of 400 samples, which included four types of defective features and sound samples. After acquiring hyperspectral images of nectarine fruits, the spectral data were extracted from region of interest (ROI). Using Kennard-Stone algorithm, all kinds of samples were randomly divided into training set (280) and testing set (120). First of all, based on the calculation of partial least squares regression (PLSR), 10 wavelengths at 497 nm, 534 nm, 657 nm, 677 nm, 696 nm, 709 nm, 745 nm, 823 nm, 868 nm and 943 nm were selected as the optimal sensitive wavelengths (SWs), respectively. Subsequently, the image of the 876 nm wavelength was named as the feature image, then principal component analysis (PCA), mask process, “Sobel” edge detector and “region grow” algorithm were carried out among defective and normal nectarines to extract the defective region. Moreover, ten principal components (PCs) were selected based on PCA, and seven textural feature variables (mean, contrast, correlation, energy, homogeneity and entropy) were extracted by using gray level co-occurrence matrix (GLCM), respectively. Finally, the ability of hyperspectral imaging technique was tested by using the extreme learning machine (ELM) models. The ELM classification model was built based on the combination of PCs and textural features. The results show the correct discrimination accuracy of defective samples was 91.67%, and the correct discrimination accuracy of normal samples was 100%. The research revealed that the hyperspectral imaging technique is a promising tool for detecting defective features in nectarine, which could provide a theoretical reference and basis for designing classification system of fruits in further work.
Number of references: 20
Main heading: Image processing
Controlled terms: Agricultural machinery - Algorithms - Computer vision - Crack detection - Cracks - Edge detection - Feature extraction - Fruits - Image acquisition - Image segmentation - Imaging techniques - Knowledge acquisition - Learning systems - Least squares approximations - Principal component analysis - Spectroscopy
Uncontrolled terms: Defective feature - Extreme learning machine - Hyperspectral Imaging - Nectarine - Nondestructive detection
Classification code: 723 Computer Software, Data Handling and Applications - 746 Imaging Techniques - 821.1 Agricultural Machinery and Equipment - 821.4 Agricultural Products - 921.6 Numerical Methods - 922.2 Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2015.11.034
Database: Compendex
44. Accession number: 20160301827866
Title: Spatiotemporal variability analysis of annual precipitation in sanjiang plain in recent sixty years
Authors: Xing, Zhenxiang1 ; Yan, Dandan1; Liu, Meixin1; Fu, Qiang1, 2 ; Li, Yinghui1
Author affiliation: 1 School of Water Conservancy & Civil Engineering, Northeast Agricultural University, Harbin, China
2 The Key Laboratory of High Efficient Utilization of Agricultural Water Resources, Ministry of Agriculture, Harbin, China
Corresponding author: Fu, Qiang (fuqiangneau@sina.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 337-344
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Trends analysis method, wavelet analysis, Mann-Kendall abrupt change test and temporal GIS were used to analyze the spatial distribution characteristics and temporal trends of precipitation based on the annual precipitation observed data from 1952 to 2012 in Sanjiang Plain. The analysis results showed that there was no obvious change trend during the whole time span with several internal variation trends for annual precipitation in five administrative areas, which meant that it existed four main periods of 28, 22, 15 and 6 years for annual precipitation series. For the whole series of precipitation in the Sanjiang Plain, there were no obvious change trends with the following internal variation trends, that was, there was a downward trend from 1955 to 1979, after then an upward trend until 1997, and then there was a downward trend in the remained annual precipitation series. There was an obvious spacial variation for precipitation. It showed that the precipitation in the middle of Sanjiang Plain was more than that in the two sides where from the north to the south during 1952 to 1954, while there was less precipitation in the middle than that in both sides where from the north to the south during 1955 to 1978, and then there was a trend of more precipitation in the north and east, and less precipitation in the south and west in Sanjiang Plain during 1979 to 2012. In addition, for both the whole Sanjiang Plain and each administrative area, the annual average precipitation amounts during 1952-1954 and 1997-2012 were more than that during 1955-1996.
Number of references: 23
Main heading: Time series analysis
Controlled terms: Wavelet analysis
Uncontrolled terms: Analysis method - Annual precipitation - Mann-Kendall - Sanjiang plain - Temporal GIS
Classification code: 921 Mathematics - 922.2 Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2015.11.046
Database: Compendex
45. Accession number: 20160301827831
Title: Reverse design and experiment of non-circular gear planetary system picking hole mechanism
Authors: Wang, Jinwu1 ; Zhou, Wenqi1; Zhang, Chunfeng2; Pan, Zhenwei1; Wang, Jinfeng1; Tang, Han1
Author affiliation: 1 College of Engineering, Northeast Agricultural University, Harbin, China
2 Beijing Research Center of Intelligent Equipment for Agriculture, Beijing, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 70-75
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming at the existing problems of big hole and bad verticality of picking hole mechanism, a kind of picking hole mechanism of non-circular gear planetary system for deep liquid fertilizer was designed. To make picking hole mechanism satisfy the agronomic required verticality when it gets into and out of the soil, the reverse design and kinematics simulation analysis of picking hole mechanism of non-circular gear planetary system were presented based on Matlab GUI development platform. Through the fine-tuning of a small amount of date points on static trajectories which were generated in the inverse design and kinematics simulation, a set of optimal parameters were obtained. The picking hole mechanism model was established by applying Pro/E software. And with the ADAMS software, the trajectory curves were got. Finally, this picking hole mechanism was tested on the test-bed, and the results showed that when the hole width was 30.3 mm and the hole distance was 221.9 mm, the proposed picking hole mechanism could meet the design requirement, that means, good verticality and small hole when it gets into and out of the soil.
Number of references: 19
Main heading: Design
Controlled terms: Fertilizers - Kinematics - MATLAB
Uncontrolled terms: Existing problems - Kinematics simulation - Liquid fertilizer applicators - Liquid fertilizers - Non-circular gears - Optimal parameter - Planetary system - Reverse designs
Classification code: 804 Chemical Products Generally - 921 Mathematics - 931.1 Mechanics
DOI: 10.6041/j.issn.1000-1298.2015.11.011
Database: Compendex
46. Accession number: 20160301827824
Title: Inter-row localization method for agricultural robot working in close planting orchard
Authors: Zhou, Jun1, 2 ; Hu, Chen1
Author affiliation: 1 Key Laboratory of Intelligent Agricultural Equipment in Jiangsu Province, Nanjing Agricultural University, Nanjing, China
2 Key Laboratory of Modern Agricultural Equipment, Ministry of Agriculture, Nanjing, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 22-28
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Global navigation satellite system for localization of agricultural machineries has been successfully used for many years in a broad-acre environment. However, it will fail to work in a close planting orchard because navigation satellite signals are often interfered by dense tree canopies. Moreover, localization by only odometers can lead to a large accumulated error. Therefore, firstly the position of an agricultural robot before entering inter-row of the close planting orchard was taken as an original point and a world coordinate system was established. A laser radar was applied to scan trunks on the both sides of the robot and the center points of trunks were extracted through circular clustering. The position values of these center points were saved in the world coordinate system. Then during the moving of the robot, the center points of trunks detected by the laser radar in real time were matched with those which had been saved previously in the world coordinate system. Matching results were applied to correct the robot position and heading angle which had been measured with only odometers. In this way the agriculture robot was able to locate itself accurately in the inter-row of the close planting orchard. Repeated experimental results showed that the robot localization standard errors in both x and y directions in the world coordinate system were about 0.08 m. The localization accuracy can meet requirements when the agricultural robot is applied in the close planting orchard. Moreover, the successful inter-row localization is the premise of global positioning and navigation of the robot working in the orchard.
Number of references: 21
Main heading: Robots
Controlled terms: Agricultural machinery - Agriculture - Farms - Navigation - Optical radar - Orchards - Radar - Robot applications - Space-based radar - Tracking (position)
Uncontrolled terms: Accumulated errors - Agricultural robot - Global Navigation Satellite Systems - Inter-row localization - Localization accuracy - Localization method - Navigation satellites - World coordinate systems
Classification code: 716.2 Radar Systems and Equipment - 731.5 Robotics - 731.6 Robot Applications - 821 Agricultural Equipment and Methods; Vegetation and Pest Control
DOI: 10.6041/j.issn.1000-1298.2015.11.004
Database: Compendex
47. Accession number: 20160301827852
Title: Effects of different saccharides on glass transition temperature and state diagram of penaeus vannamei meat
Authors: Shi, Qilong1 ; Zhao, Ya1; Cao, Shumin1; Zhang, Jingjing1
Author affiliation: 1 School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 236-244
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Effects of different saccharides, viz. sugar, inulin and trehalose on the glass transition temperature and state diagram of Penaeus vannamei meat (PV) were investigated to improve the storage stability of Penaeus vannamei meat. Moisture adsorption isotherms of PV and Penaeus vannamei meat with addition (w/w) of 10% sugar (PV-S), 10% inulin (PV-I) and 10% trehalose (PV-T) were determined at 25 by using the gravimetric method. Differential scanning calorimetry was employed to determine the glass transition temperature (Tg) and freezing point (TF) of samples equilibrated at various water activities. The state diagram was composed of the glass transition line and freezing curve, which were fitted according to Gordon-Taylor model and Clausius-Clapeyron model, respectively. The results showed that the adsorption behaviour of Penaeus vannamei meat (PV, PV-S, PV-I and PV-T) displayed type III isotherms. The GAB model statisfactory described the adsorption behavior of PV, PV-S, PV-I and PV-T. The equilibrium moisture content of PV, PV-S, PV-I and PV-T increased with increasing water activity (aw). Moisture content of PV-S, PV-I and PV-T at a given awwas lower than that of PV. The monolayer moisture content decreased with the addition of saccharides. Tgof PV, PV-S, PV-I and PV-T decreased with increasing moisture content. Tgincreased with the addition of saccharides. The state diagram yielded maximally-freeze-concentrated solutes at 73.2%, 73.4%, 72.6% and 73.4% solids with the characteristic temperature of glass transition being -71.35, -64.76, -58.36 and -59.36 for PV, PV-S, PV-I and PV-T, respectively. The corresponding un-freezable waters for PV, PV-S, PV-I and PV-T were 26.8%, 26.6%, 27.4% and 26.6%, respectively. The storage stability and shelf life of meat can be markedly improved by addition of saccharides especially inulin and trehalose.
Number of references: 35
Main heading: Glass transition
Controlled terms: Adsorption - Adsorption isotherms - Differential scanning calorimetry - Freezing - Glass - Meats - Moisture - Moisture determination - Polysaccharides - Sugars - Temperature
Uncontrolled terms: Characteristic temperature - Clausius-Clapeyron model - Equilibrium moisture contents - Moisture adsorption - Monolayer moisture content - Penaeus vannamei - Saccharides - State diagram
Classification code: 641.1 Thermodynamics - 802.3 Chemical Operations - 804.1 Organic Compounds - 812.3 Glass - 822.3 Food Products - 944.2 Moisture Measurements - 944.6 Temperature Measurements
DOI: 10.6041/j.issn.1000-1298.2015.11.032
Database: Compendex
48. Accession number: 20160301827819
Title: Two-level optimization method of bed unit structure considering dynamic performance of machine tool
Authors: Liu, Chengying1, 2 ; Tan, Feng3; Wang, Liping1, 2; Huang, Ziling1, 2
Author affiliation: 1 Department of Mechanical Engineering, Tsinghua University, Beijing, China
2 Beijing Key Laboratory of Precision/Ultra-precision Manufacturing Equipments and Control, Tsinghua University, Beijing, China
3 China Aviation Power Machinery Research Institute, Zhuzhou, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 399-404
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: It is often difficult to achieve further optimization results of machine tool parts in terms of sizes parameters after the topology structure of these parts are determined. Taking the machine bed structure of a horizontal machining center as an object, a two-level optimization method of the unit structure was proposed, which was based on the analysis and optimization of unit structure, to optimize the whole machine tool bed. Firstly, according to structural features of this machine tool bed, different unit structures were analyzed and compared, and then the round and oval sand hole with original sizes parameters were chosen as the most suitable units to redesign the bed structure. After that, based on response surface method and taking the whole machine tool bed as optimization goal, the second-level optimization of unit structure in terms of sizes parameters was achieved. On the premise of minimal change of bed mass, the results of the analysis demonstrate that the two-level optimization method achieves better dynamic performance of machine tool compared with single-level optimization method which only focuses on the optimization of unit structure. To be more specific, the former method can increase the fundamental frequency of this machine tool bed 3 times than the latter method. Besides, when the former method is applied, the biggest resonance peak of this machine tool is reduced by 55.2% in X-direction, 83.9% in Y-direction, and 82.8% in Z-direction.
Number of references: 16
Main heading: Shape optimization
Controlled terms: Machine tools - Machining centers - Mechanisms - Structural optimization
Uncontrolled terms: Dynamic performance - Fundamental frequencies - Horizontal machining - Optimization goals - Optimization method - Response surface method - Two-level optimization - Unit structure
Classification code: 601.3 Mechanisms - 603.1 Machine Tools, General - 921.5 Optimization Techniques
DOI: 10.6041/j.issn.1000-1298.2015.11.054
Database: Compendex
49. Accession number: 20160301827856
Title: Water imbibition and germination of wheat seed with nuclear magnetic resonance
Authors: Yao, Shijin1, 2 ; Mou, Hongmei1, 2; Du, Guangyuan3; Feng, Hao2, 4; Bai, Jiangping5; He, Jianqiang1, 2
Author affiliation: 1 College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi, China
2 Institute of Water Saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling; Shaanxi, China
3 College of Sciences, Northwest A&F University, Yangling; Shaanxi, China
4 Institute of Water and Soil Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling; Shaanxi, China
5 Gansu Province Key Laboratory of Crop Genetic and Germplasm Enhancement, Gansu Agricultural University, Lanzhou, China
Corresponding author: He, Jianqiang (jianqiang_he@nwsuaf.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 266-274
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Water absorption influences the germination and metamorphosis of seed. A continuous long-term investigation of germination process and water distribution can help to reveal the water absorption mode of winter wheat (Triticum aestivum L.) seed and lay a theoretic foundation for rational water management during seed germination. The nuclear magnetic resonance (NMR) technique can be used on probe water distribution of seed in a noninvasive and nondestructive way and has been broadly used in the studies on seed and water relationship. The techniques of magnetic resonance imaging (MRI) and T2relaxation spectrum of NMR were used to continuously investigate the water distribution and variation in a germinating seed of winter wheat for 72 h. Images of longitudinal and transverse sections of wheat seed were obtained every hour after the starting of imbibition and used to observe water distributions in different seed tissues. When the seed soaked, its volume increased rapidly at the beginning of seed imbibition (0~6 h). Some localized hydrations were already evident in the embryo, coat, and nucellar projection. During the germination prepare phase (6~22 h), water content of the coat was higher than that of the endosperm and there was a clear boundary between the bran and the endosperm in the images. Although water accumulated in the coat surrounding the endosperm, there was no evident movement of water directly across the coat and into the underlying starchy endosperm. The water content of nucellar projection was also higher than that of endosperm. Only the water from the nucellar projection gradually diffused into the endosperm. This proved that it was through the nucellar projection rather than the coat and embryo, the water entered into wheat seed. This finding is different from the description in some current textbooks. In this process, the water content of embryo increased and the volume of embryo was increasing at the same time. It showed that embryonic cells began to divide and elongate, and the volume of root sheath became remarkably larger than before. In the stage of germination, the root sheath emerged from a breaking hole in seed coat at 22 h and the radicle grew smoothly out at 24 h. Thereafter, the volume of shoot sheath started to increase and the seed sprouted at 27 h. From then on, seed imbibed water through the radicle and hole in the coat. Water content of endosperm increased and endosperm was activated from bottom to top. Nutrients stored in the aleurone cells near the embryo began decomposing and moved to the central area gradually. The above processes of water transfer and distribution could not be visually detected from the outside with traditional methods. The results of T2relaxation spectrum analysis showed that there were three distinct phases of water-uptake during the germination of a mature dry seed of winter wheat. During the first phase, water-uptake was rapid initially and then became stable. In the second phase, water absorption rate increased slowly, which was different from the traditionally observed period of stagnation. This phenomenon was probably due to the temperature change effect and magnetic biological effect on plant growth during the NMR detection. In the third phase, water absorption rate oscillated remarkably. This kind of oscillation was probably caused by the periodic water absorption by plant roots. When roots grew over time, their ability to absorb water was enhanced. Thus, the amount of water involved in metabolic activity became larger. When the seed needed a large amount of water for metabolism, the root had to absorb enough water to meet the metabolic demand. After that, the water absorption rate of roots reduced appropriately until the seed required plenty of water for metabolism again. Hence, the water absorption rate of wheat seed oscillated sharply, but with an overall increase in the third phase. In general, the techniques of NMR can help to reveal the water dynamics and distribution in germinating seed more continuously and precisely. The study also realized the direct inside measurement of water content variation in wheat seed, which could not be detected directly with traditional methods. The results will help lay a theoretic foundation for the study and management of germination and water consumption of winter wheat.
Number of references: 19
Main heading: Water absorption
Controlled terms: Crops - Cultivation - Magnetic resonance imaging - Magnetism - Metabolism - Nuclear magnetic resonance - Physiology - Resonance - Seed - Spectrum analysis - Water management - Water supply systems
Uncontrolled terms: Germination - Imbibition - Localized hydrations - Nuclear magnetic resonance techniques - Relaxation spectrum - Water absorption rates - Wheat - Winter wheat (Triticum aestivum L.)
Classification code: 446.1 Water Supply Systems - 461.9 Biology - 701.2 Magnetism: Basic Concepts and Phenomena - 802.3 Chemical Operations - 821.3 Agricultural Methods - 821.4 Agricultural Products - 931.1 Mechanics
DOI: 10.6041/j.issn.1000-1298.2015.11.036
Database: Compendex
50. Accession number: 20160301827864
Title: Urban-rural land use plan monitoring based on high spatial resolution remote sensing imagery classification
Authors: Zhang, Chao1 ; Li, Zhixiao1; Li, Pengshan1; Yang, Jianyu1, 2; Zhu, Dehai1, 2
Author affiliation: 1 College of Information and Electrical Engineering, China Agricultural University, Beijing, China
2 Key Laboratory for Agricultural Land Quality, Monitoring and Control, Ministry of Land and Resources, Beijing, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 323-329
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Urban-rural land use plan is the foundation of healthily and orderly sustainable development of urbanization and the monitoring of plan implementation is considered as the guarantee. The association of remote sensing and GIS is one of rapid and effective monitoring method for urban-rural land use plan implementation which strongly strengthens the dynamic management of land use plan implementation. We used high spatial resolution remote sensing imagery-WorldView-2 with resolution of 0.5 m and the object-oriented image analysis method to achieve the classification. The features and thresholds were determined with CART decision tree in object-oriented rule classification. On the basis of classification results, the completion rate of land plan for each plan patch was computed with the monitoring and evaluation of land use plan implementation. Finally, a subdistrict of Fangshan District, Beijing City was taken as the study area to illustrate the method. The results showed that the final overall accuracy of classification was 0.89 and Kappa coefficient was 0.87. The proposed classification algorithm can meet the basic needs of urban-rural land use plan monitoring. The implementation of land use plan in northeast study area is better than that in the west. The public green land and water area need to be investigated and monitored further as the key objects, at the same time, the density of second type residential building is a little high, while the green landrate is low.
Number of references: 20
Main heading: Land use
Controlled terms: Agriculture - Data mining - Decision trees - Geographic information systems - Image resolution - Monitoring - Remote sensing - Rural areas
Uncontrolled terms: Classification algorithm - High spatial resolution - Monitoring and evaluations - Object oriented classification - Object-oriented image analysis - Remote sensing imagery - Urban-rural - Worldview-2
Classification code: 403 Urban and Regional Planning and Development - 723.2 Data Processing and Image Processing - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 903.3 Information Retrieval and Use - 961 Systems Science
DOI: 10.6041/j.issn.1000-1298.2015.11.044
Database: Compendex
51. Accession number: 20160301827821
Title: Recognition and location of oscillating fruit based on monocular vision and ultrasonic testing
Authors: Li, Guoli1, 2 ; Ji, Changying1 ; Gu, Baoxing1
Author affiliation: 1 College of Engineering, Nanjing Agricultural University, Nanjing, China
2 School of Mechanical and Electronic Engineering, Jinling Institute of Technology, Nanjing, 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: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 1-8
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 harvesting robot under the target fruit oscillation condition, a recognition and location method of oscillating fruit based on monocular vision and ultrasonic testing was proposed. Firstly, the acquired sequential images of oscillating fruit were segmented by using Otsu algorithm based on R-G color component; morphological operation was employed to eliminate residual noise; and the region of target fruit was separated from backgrounds. Secondly, the region of target fruit was filled with gray threshold. Thirdly, the processed sequential images were superimposed and a composite image was obtained, and the 2-D centroid coordinates of the oscillating fruit were extracted from the fruit oscillating region in the composite image. Fourthly, the picking manipulator was controlled to move and its end was pointed to 2-D centroid coordinates, at the same time, the depth information of the target fruit was acquired through ultrasonic testing, and the peak-to-peak value of ultrasonic echo signal was extracted for recognition of fruit and tree. Finally, the end-effector of picking manipulator was started to grab the fruit when it was within valid range and the manipulator was stopped motion. The experiments results showed that the success rate of picking can reach 86%. This method is universal and suitable for apple, citrus, pears and other spherical fruits. The research can provide a reference for realization of harvesting robot practicability.
Number of references: 26
Main heading: Ultrasonic testing
Controlled terms: Citrus fruits - Fruits - Harvesting - Location - Manipulators - Mathematical morphology - Robots - Vision
Uncontrolled terms: Centroid coordinates - Harvesting robot - Monocular vision - Morphological operations - Picking manipulators - Recognition - Recognition and locations - Ultrasonic echo signals
Classification code: 731.5 Robotics - 753.3 Ultrasonic Applications - 821.3 Agricultural Methods - 821.4 Agricultural Products
DOI: 10.6041/j.issn.1000-1298.2015.11.001
Database: Compendex
52. Accession number: 20160301827848
Title: Experimental study on preparation of hydrogen-rich gas from pine sawdust pellets
Authors: Pang, Yunji1, 2 ; Shen, Shengqiang1 ; Chen, Yisheng2; Ma, Lijun2; Wang, Hongkun2
Author affiliation: 1 School of Energy and Power Engineering, Dalian University of Technology, Dalian, China
2 School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, China
Corresponding author: Shen, Shengqiang (zzbshen@dlut.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 208-213
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Experimental results are presented on the gasification of pine sawdust pellets using high temperature steam as the gasification agent. Downdraft gasifier was adopted as reactor, the reactor temperature was varied from 700 to 950, and steam to biomass ratio (S/B) was changed from 0.3 to 1.0. Based on biomass gasification technology, the gasification characteristics of pine sawdust pellets were deeply discussed. In addition, numerical computation using Gibbs free energy minimization was applied and compared with the experimental results. The results show that hydrogen-rich gas could be effectively produced by high temperature steam in downdraft gasifier, and the carbon layer played an important role in preparation of hydrogen-rich gas, in which steam reforming reaction and tar cracking were taken place. H2and CO yields would rise at higher temperature, and H2volume fraction would reach the peak when reactor temperature raised some value, H2fraction would decline if the temperature was continued to raise. The increase of S/B could develop H2content of product gas, temperature of material bed would be dropped by some endothermic reactions, and the increase of H2volume fraction was restrained. In the test, the peak value of H2volume fraction was 47.67% with S/B of 1.0 and temperature of 900. These results also provide the operating law for downdraft gasifier with high temperature steam.
Number of references: 19
Main heading: Gasification
Controlled terms: Carbon - Free energy - Gases - Gibbs free energy - Hydrogen - Pelletizing - Steam - Steam cracking - Steam reforming - Volume fraction
Uncontrolled terms: Endothermic reactions - Gasification characteristics - Gasifiers - Gibbs free energy minimization - High temperature steam gasifications - Hydrogen-rich gas - Numerical computations - Pine sawdust
Classification code: 641.1 Thermodynamics - 802.2 Chemical Reactions - 802.3 Chemical Operations - 804 Chemical Products Generally
DOI: 10.6041/j.issn.1000-1298.2015.11.028
Database: Compendex
53. Accession number: 20160301827855
Title: Stray light reduction research on on-line detection of apple's sugar content
Authors: Han, Donghai1 ; Zhou, Enyang2; Qi, Shuye1
Author affiliation: 1 College of Food Science & Nutritional Engineering, China Agricultural University, Beijing, China
2 College of Engineering, China Agricultural University, Beijing, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 260-265
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: This paper designed an intelligent on-line hierarchical device to grade apple according to its sugar content on the basis of the principle of spectroscopy, and mainly studied the stray light problem of the on-line equipment with receiver at the top of the line. By analyzing the diagram of light path, we analyzed the influence of three different laying ways of Fuji apples on the stray light and put forward a shading treatment to reduce the noise of stray light. The models for on-line predicting soluble solids content (SSC) of Fuji apples were built respectively by using the partial least squares (PLS) regression. The results proved that, for on-line equipment with receiver at the top of the line, the laying way of apple and the shading treatment were very important. Among these laying ways, “peduncle up and shading treatment” was the best. The parameters of the model are pretty good, with RMSEC of 0.60, RC of 0.94, RMSEP of 0.67, and RP of 0.87. It's able to achieve the demands of grading apples on-line in practical production.
Number of references: 22
Main heading: Stray light
Controlled terms: Fruits - Grading - Least squares approximations - Spectroscopy
Uncontrolled terms: Apple - On-line detection - Partial least-squares regression - Practical production - Shading treatments - Soluble solids content - Stray light reduction - Sugar content
Classification code: 741.1 Light/Optics - 821.4 Agricultural Products - 921.6 Numerical Methods
DOI: 10.6041/j.issn.1000-1298.2015.11.035
Database: Compendex
54. Accession number: 20160301827844
Title: Study of soil macropore spatial structure based on stand spatial structure analysis method
Authors: Chen, Xiaobing1, 2 ; Cheng, Jinhua1, 2 ; Chen, Yinzhen2; Zhang, Hongjiang1, 2; Zhang, Fuming3; Yao, Jingjing1, 2
Author affiliation: 1 School of Soil and Water Conservation, Beijing Forestry University, Beijing, China
2 Key Laboratory of Soil and Water Conservation and Desertification Combating, Ministry of Education, Beijing Forestry University, Beijing, China
3 Chongqing Forest Resource Management Bureau of Simian Mountain, Chongqing, China
Corresponding author: Cheng, Jinhua (jinhua_cheng@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 46
Issue: 11
Issue date: November 25, 2015
Publication year: 2015
Pages: 174-186 and 194
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The soil macropores development and distribution in the field play an key ecological role in soil ecosystems, because of the complex interaction of soil's structures, moisture condition, stress level and biological activities. However, few researchers have used the ecological method to study the spatial structures of the soil macropores. This paper presents a new method (i. e., combining with the ecology and morphology) to quantitatively investigate the spatial structure characteristics of macropores in purple sandstone regions the typical three land use types in Three Gorges Reservoir Area, with the stand spatial structure analysis method and image processing technology. The results demonstrated that the shapes and spatial structures of the soil macropores of three land use types were highly complicated. The soil macropores were mainly represented a gradual tendency of clumped distribution pattern and community structures (i. e., composing of the same pore size macropore with increasing soil depth), especially the grassland. The development degree of macropores in three land use types gradually decreased with the increase of soil depth. Three land use types' development degrees of the preferential flow were in this order from high to low: grassland, orchard and farmland. The spatial connectivity, the development degree and water conductivity of different preferential flow paths in same land use type were in this order from high to low: for grassland, [5.0 mm, ∞), [2.5 mm, 5.0 mm), [1.0 mm, 2.5.mm), (0, 1.0 mm), however, for farmland and orchard, [1.0 mm, 2.5 mm), [2.5 mm, 5.0 mm), (0, 1.0 mm), [5.0 mm, ∞). The analysis results of stand spatial structure analysis method were compared with distribution density of the soil macropore, variability, complexity and previous research methods. The same result proved the accuracy and applicability of stand spatial structure analysis method used to analyze the spatial structures of macropores. This new method provides an effective, convenient, rapid and more economical method for studying spatial structures of macropores, and gives us more spatial structure information from the viewpoint of ecology. Meanwhile, it compensates for the deficiency of the current methods (e. g., dye tracer, visual liquid latex, water breakthrough curves analysis and CT technique) based on physical and chemical analysis about theoretical analysis of macropores structures, and further reveals the reasons about the formation and distribution of spatial structure of the soil macropores.
Number of references: 31
Main heading: Soil surveys
Controlled terms: Chemical analysis - Computerized tomography - Ecology - Farms - Groundwater flow - Image processing - Land use - Orchards - Pore size - Reservoirs (water) - Soils - Spatial variables measurement
Uncontrolled terms: Image processing technology - Land use type - Macropores - Physical and chemical analysis - Preferential flows - Spatial structure analysis - Spatial structure information - Three gorges reservoir area
Classification code: 403 Urban and Regional Planning and Development - 441.2 Reservoirs - 444.2 Groundwater - 454.3 Ecology and Ecosystems - 483.1 Soils and Soil Mechanics - 723.5 Computer Applications - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 821.3 Agricultural Methods - 943.2 Mechanical Variables Measurements - 951 Materials Science
DOI: 10.6041/j.issn.1000-1298.2015.11.024
Database: Compendex
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