2016年第8期共收錄53篇
1. Damping optimization design of hybrid energy regenerative suspension system based on energy optimization
Accession number: 20163802820519
Authors: Chen, Long (1); Wang, Jiajia (1); Wang, Ruochen (1); Ding, Renkai (1); Xie, Jian (1)
Author affiliation: (1) Automotive Engineering Research Institute, Jiangsu University, Zhenjiang; 212013, China
Corresponding author: Wang, Ruochen(wrc@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 305-310 and 316
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to harvest the vibration energy of suspension and make it with fail-safe characteristics, a hybrid suspension structure with spring, damper and linear motor in parallel was proposed. According to the dead zone in the harvesting process of linear motor, a DC/DC boost circuit was designed so that the electromagnetic damping force can still be provided by the linear motor in the process of dead zone. Based on the energy dissipation of traditional passive suspension, an explicit expression of energy efficiency in the same driving cycle was obtained. And the energy efficiency of suspension was used as evaluation index of suspension. Meanwhile, to take into account of the performance of system dynamics, the influence of damping value on energy regeneration performance and vibration isolation performance was studied, and the optimal shock absorber damping value was determined by compromise design. A hybrid energy regenerative suspension dynamic model was established, the vibration isolation performance and energy regeneration performance of suspension based on optimal damping of vibration damper were compared and analyzed. The simulation results showed that the hybrid energy regenerative suspension can effectively coordinate the energy efficiency and vibration isolation of the vehicle. Finally, based on the simulation, the experimental study on hybrid energy regenerative suspension was carried out on the INSTRON 8800 numerical control hydraulic servo exciting test bench. The test results were in agreement with the simulation results, which verified the correctness of simulation results. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 19
Main heading: Energy efficiency
Controlled terms: Damping? - ?DC-DC converters? - ?Energy dissipation? - ?Linear motors? - ?Magnetic levitation vehicles? - ?Shock absorbers? - ?Suspensions (components)? - ?Vibration analysis? - ?Vibrations (mechanical)
Uncontrolled terms: Electromagnetic damping? - ?Energy optimization? - ?Energy regeneration? - ?Hybrid energy? - ?Optimization design? - ?Passive suspension? - ?Performance of systems? - ?Vibration isolations
Classification code: 525.2 Energy Conservation
Energy Conservation
? - ?525.4 Energy Losses (industrial and residential)
Energy Losses (industrial and residential)
? - ?601.2 Machine Components
Machine Components
? - ?704.1 Electric Components
Electric Components
? - ?705.3 Electric Motors
Electric Motors
? - ?931.1 Mechanics
Mechanics
DOI: 10.6041/j.issn.1000-1298.2016.08.040
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
2. Chlorophyll content inversion with hyperspectral technology for apple leaves based on support vector regression algorithm
Accession number: 20163802820513
Authors: Liu, Jing (1); Chang, Qingrui (1); Liu, Miao (1); Yin, Zi (1); Ma, Wenjun (1)
Author affiliation: (1) College of Natural Resources and Environment, Northwest A&F University, Yangling; Shaanxi; 712100, China
Corresponding author: Chang, Qingrui(changqr@nwsuaf.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 260-265 and 272
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To realize the chlorophyll content inversion with hyperspectral technology for apple leaves, the spectral data and SPAD values were obtained by SVC HR-1024i full band spectrometer and SPAD-502 portable chlorophyll analyzer, respectively. The correlation of original spectral data, the first derivative spectral data and measured SPAD values were analyzed, various spectral parameters were selected based on the sensitive wave bands and models between spectral parameters and measured SPAD values were established. The original spectra and the SPAD value were significantly negatively correlated in visible bands, and significantly positively correlated in NIR bands. The first order derivations of spectra and the SPAD value were negatively correlated in blue and green light bands, and positively correlated in yellow and red light bands. The SPAD inversion model based on NDVI and R565 fitted well. The first derivative spectral data and measured SPAD values had improved correlation coefficient compared with the original spectral data, and the determination coefficient R2in the inspection process of models establishment based on normalized difference vegetation index (NDVI) and R565were 0.889 6 and 0.852 4, which showed better prediction ability than other models. To avoid the difference of order of magnitude, the spectral parameters and measured SPAD values were normalized, and polynomial regression and support vector regression (SVR) were carried out by using the normalized spectral parameters and SPAD values. The R2in the modeling process and inspection process of SVR inversion model were 0.741 0 and 0.891 4 with root mean square error of 0.133 2 and 0.125 6, respectively, which indicated that the SVR inversion had high precision and good prediction ability. Compared with polynomial regression, the SVR algorithm had better inversion effect, thus it can be used as an optimization algorithm for chlorophyll content inversion. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Regression analysis
Controlled terms: Algorithms? - ?Chlorophyll? - ?Fruits? - ?Mean square error? - ?Optimization
Uncontrolled terms: Apple leaves? - ?Inversion? - ?SPAD value? - ?Spectral parameters? - ?Support vector regression (SVR)
Classification code: 804.1 Organic Compounds
Organic Compounds
? - ?821.4 Agricultural Products
Agricultural Products
? - ?921.5 Optimization Techniques
Optimization Techniques
? - ?922.2 Mathematical Statistics
Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2016.08.034
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
3. Effects of chicken manure co-applied with nitrogen fertilizer on soil organic carbon oxidation stability and carbon pool management index in kidney bean/maize rotation soil
Accession number: 20163802820503
Authors: Jing, Dawei (1); Wang, Mingyou (1); Zhang, Hong (1); Li, Shiping (1)
Author affiliation: (1) College of Ecology and Garden Architecture, Dezhou University, Dezhou; 253023, China
Corresponding author: Wang, Mingyou(nwmy_sddz@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 192-200
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: ccording to the difference in the degree of difficulty or easiness of decomposition, the soil organic carbon can be divided into readily oxidizable organic carbon and hardly oxidizable organic carbon. The readily oxidizable organic carbon plays an important role in supplying ability of soil nutrient, while hardly oxidizable organic carbon contributes to stabilizing the soil structure, and it is related to the storage of soil organic carbon. Meanwhile, soil carbon pool management index (CPMI) can reflect the effects of external condition on soil organic carbon contents and active organic carbon contents, and comprehensively reflect the extent of decline or update of soil quality. However, there is little information on the effect of chicken manure co-applied with inorganic fertilizer on soil organic carbon oxidation stability and CPMI, especially the study of kidney bean/maize rotation soil was scarcely reported. Therefore, for exploring the effect of chicken manure co-applied with nitrogen fertilizer in different proportions on soil organic carbon oxidation stability and CPMI in kidney bean/maize rotation soil, a field experiment, including four treatments, i.e., N100(100% of nitrogen was provided by urea), M10N90(10% and 90% of nitrogen was provided by chicken manure and urea, respectively), M30N70(30% and 70% of nitrogen was provided by chicken manure and urea, respectively), and M50N50(50% and 50% of nitrogen was provided by chicken manure and urea, respectively) were carried out. The aim was to determine the effects of different treatments on total organic carbon (TOC), microbial biomass carbon (MBC), readily oxidizable carbon (ROC) contents, organic carbon oxidation stability, as well as CPMI of kidney bean/maize rotation soil during the 2009-2014 period. Results indicated that the TOC contents of M10N90, M30N70and M50N50treatments were increased by 5.21%, 12.74% and 19.87% in comparison with the N100treatment, respectively. The MBC and ROC contents and CPMI achieved the highest value in M30N70treatment and had significant differences with other treatments, which showed 54.03%, 16.50% and 10.43% increases in ROC content and 75.10, 30.75 and 27.94 increases in CPMI, respectively, compared with those in treatments of N100, M10N90and M50N50. However, the oxidation stability index of organic carbon in M30N70treatment was obviously lower than other treatments, which was reduced by 35.95% compared with N100treatment. Furthermore, the M30N70treatment could significantly increase yield and improve quality of kidney bean, which had statistically significant differences with other treatments. Correlation analysis revealed that yield and Vc content of kidney bean were significantly or extremely significantly correlated with microbial biomass carbon, readily oxidizable carbon, organic carbon oxidation stability and carbon pool management index in the soil, indicating close inner link among each indicator. In conclusion, the application of chicken manure co-applied with inorganic fertilizer, especially the M30N70treatment, was beneficial to soil quality amelioration and soil nutrient-supply capacity improvement as well as growth of high-yield and high-quality kidney bean in the rotation plantation. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 35
Main heading: Organic carbon
Controlled terms: Animals? - ?Carbon? - ?Decay (organic)? - ?Fertilizers? - ?Lakes? - ?Manures? - ?Metabolism? - ?Nitrogen? - ?Nitrogen fertilizers? - ?Nutrients ? - ?Oxidation? - ?Rotation? - ?Soils? - ?Stability? - ?Urea
Uncontrolled terms: Carbon pool? - ?Chicken manure? - ?Kidney beans? - ?Microbial biomass carbon? - ?Organic carbon contents? - ?Oxidation stability? - ?Soil organic carbon content? - ?Statistically significant difference
Classification code: 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?802.2 Chemical Reactions
Chemical Reactions
? - ?804 Chemical Products Generally
Chemical Products Generally
? - ?804.1 Organic Compounds
Organic Compounds
? - ?821.5 Agricultural Wastes
Agricultural Wastes
? - ?931.1 Mechanics
Mechanics
Numerical data indexing: Percentage 1.00e+01%, Percentage 1.00e+02%, Percentage 1.04e+01%, Percentage 1.27e+01%, Percentage 1.65e+01%, Percentage 1.99e+01%, Percentage 3.00e+01%, Percentage 3.60e+01%, Percentage 5.00e+01%, Percentage 5.21e+00%, Percentage 5.40e+01%, Percentage 7.00e+01%, Percentage 9.00e+01%
DOI: 10.6041/j.issn.1000-1298.2016.08.024
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
4. Synthesis of RCCC linkage to visit four given positions based on solution region
Accession number: 20163802820325
Authors: Cao, Yang (1); Han, Jianyou (1)
Author affiliation: (1) School of Mechanical Engineering, University of Science and Technology Beijing, Beijing; 100083, China
Corresponding author: Han, Jianyou(jyhan@ustb.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 399-405
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The generalization of spherical rectification theory was considered to spatial RCCC linkages to visit four given positions. The problem of synthesis of spatial four-bar linkages of the RCCC type for rigid-body guidance with four given positions was focused, in which R denoting a revolute, C denoting a cylindrical kinematic pair. While synthesis equations for CC and RC dyads were available in literatures, the synthesis of spatial RCCC four-bar linkages required special attention due to its asymmetric topology. However, infinitely many exact solutions to the problem of CC-dyad synthesis existed for the four-pose rigid-body-guidance problem, the RC-dyad synthesis admitted only approximate solutions, thus the RCCC linkage was capable of visiting four positions. A solution region theory was proposed to synthesis a RCCC linkage which was to visit four positions. Firstly, the expression of spherical Burmester curve and the classification was given to make a solution region. The second solution region (moment solution region) was born follow-up by picking a point on Burmenster curve solution region. Secondly, the second region which also was the spatial 4C linkage solution region, while the linkage was 2-DOF. Through restricting the prismatic joint between drive and ground on spatial 4C linkage solution region, a spatial RCCC linkage which can visit four given positions was got. Finally, two examples were given which proved that the theory was validated and correct. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: End effectors
Controlled terms: Rigid structures
Uncontrolled terms: Approximate solution? - ?Exact solution? - ?Follow up? - ?Four-bar linkage? - ?Kinematic pairs? - ?Prismatic joint? - ?Rigid body? - ?Spatial RCCC linkage
Classification code: 408 Structural Design
Structural Design
? - ?731.5 Robotics
Robotics
DOI: 10.6041/j.issn.1000-1298.2016.08.052
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
5. Prediction model for flow boiling heat transfer of nanorefrigerant in microchannels
Accession number: 20163802820525
Authors: Feng, Zhenfei (1, 2); Luo, Xiaoping (1); Zhou, Jianyang (1); Wu, Di (1)
Author affiliation: (1) School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou; 510641, China; (2) School of Chemistry and Chemical Engineering, Guangxi University, Nanning; 530004, China
Corresponding author: Luo, Xiaoping(mmxpluo@scut.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 346-355
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: R141b and Al2O3were selected as base fluid and nanoparticle, respectively, and the two-step method was used to prepare Al2O3-R141b nanorefrigerant. The mass fractions were 0.2%, 0.5% and 0.8%, respectively. The flow boiling heat transfer of Al2O3-R141b nanorefrigerant and R141b refrigerant in rectangular microchannels with hydraulic diameter of 1.33 mm was experimentally investigated. Experimental conditions included saturation pressure of 176 kPa,inlet subcooling from 6 to 12,volume flow rate from 20 L/h to 50 L/h,and heat flux from 11.1 kW/m2to 26.6 kW/m2. The experimental results were used to evaluate seven heat transfer models for pure working fluid and two heat transfer models for nanorefrigerant. Results showed that the pure working fluid heat transfer models were not suitable for nanorefrigerant. The Peng-Ding heat transfer model for nanorefrigerant combined with the Kim-Mudawar model for pure working fluid gave relatively good agreement with experimental data, the mean absolute error (MAE) was 17.22%, which reflected the effect of nanoparticles on flow boiling heat transfer. A new nanoparticle impact factor (the ratio of heat transfer coefficient of nanorefrigerant to refrigarant) correlation was proposed based on Peng-Ding model and experimental data, the new correlation had good predictability with MAE of 15.2%, and the new correlation combined with the Bertsch model provided good prediction of heat transfer coefficient for nanorefrigerant in microchannels, and the MAE was decreased to 16.4%. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 29
Main heading: Heat transfer
Controlled terms: Aluminum? - ?Fluids? - ?Heat flux? - ?Heat transfer coefficients? - ?Microchannels? - ?Nanoparticles
Uncontrolled terms: Experimental conditions? - ?Flow boiling? - ?Flow boiling heat transfer? - ?Heat transfer model? - ?Nano refrigerants? - ?Nanoparticle impacts? - ?Rectangular microchannels? - ?Saturation pressure
Classification code: 541.1 Aluminum
Aluminum
? - ?641.2 Heat Transfer
Heat Transfer
? - ?761 Nanotechnology
Nanotechnology
? - ?933 Solid State Physics
Solid State Physics
Numerical data indexing: Percentage 1.52e+01%, Percentage 1.64e+01%, Percentage 1.72e+01%, Percentage 2.00e-01%, Percentage 5.00e-01%, Percentage 8.00e-01%, Pressure 1.76e+05Pa, Size 1.33e-03m, Surface_Power_Density 1.11e+04W/m2 to 2.66e+04W/m2
DOI: 10.6041/j.issn.1000-1298.2016.08.046
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
6. Response of soil moisture on climate characteristics based on SPI and SPEI in Loess Region of Northern Shaanxi
Accession number: 20163802820499
Authors: Zhao, Xingkai (1); Li, Zengyao (1); Zhu, Qingke (1)
Author affiliation: (1) School of Soil and Water Conservation, Beijing Forestry University, Beijing; 100083, China
Corresponding author: Zhu, Qingke(zhuqingke@sohu.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 155-163
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to exactly figure out the climate characteristics and its relationship with soil water content, precipitation and air temperature characteristics were analyzed by using the standardized precipitation index (SPI) and the standardized precipitation evapotranspiration index (SPEI) as well as Mann-Kendall tests based on precipitation and air temperature data from Wuqi synoptic station over the period of 1957-2014, and regression analysis of soil water content was also performed. The results showed that: (1) an obvious difference was existed among annual precipitations, and the seasonal precipitation series had different trends. On the whole, precipitation displayed a decreasing trend with value of 11.17 mm/(10 a). Compared with precipitation, significantly increasing trend of air temperature was detected at seasonal scale with a rate of 0.01/(10 a). Significantly changing trends existed in the series of precipitation and air temperature, and the crossing points were 1972 and 1991, respectively. (2) Both SPI and SPEI can accurately reflect the climate characteristics of the study area. In general, wet year alternated with dry year during the period of 1957-2014. The main rainy period was estimated to appear in the 1960s. The occurred chances for wet years and dry years were almost the same, but both of them were far less than normal years. Wuqi county initially exhibited a warming and drying trend, which would be even more serious in future. (3) The relationship between soil water content in 0~1 m soil depth on the slopes of different directions and one month scale SPI/SPEI could be stated with a quadratic function which had high fitting accuracy. SPI-1/SPEI-1 must achieve a certain degree then showed positive correlation with soil water content, and different slopes had different required levels. This research showed that both SPI and SPEI were suitable for application in loess region of northern Shaanxi because of the similar analysis results. This method can be applied to other different parts of the climate change research, especially in arid and semi-arid region; the results can provide reference for climate change in loess region of northern Shaanxi, and provide theoretical basis for promoting vegetation restoration artificially. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Climate change
Controlled terms: Atmospheric temperature? - ?Evapotranspiration? - ?Moisture? - ?Regression analysis? - ?Sediments? - ?Soil moisture? - ?Soils? - ?Stream flow
Uncontrolled terms: Arid and semi-arid regions? - ?Climate characteristics? - ?Northern shaanxi? - ?Positive correlations? - ?Seasonal precipitations? - ?Standardized precipitation evapotranspiration index? - ?Standardized precipitation index? - ?Vegetation restoration
Classification code: 407.2 Waterways
Waterways
? - ?443.1 Atmospheric Properties
Atmospheric Properties
? - ?483 Soil Mechanics and Foundations
Soil Mechanics and Foundations
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?922.2 Mathematical Statistics
Mathematical Statistics
Numerical data indexing: Size 0.00e+00m to 1.00e+00m
DOI: 10.6041/j.issn.1000-1298.2016.08.020
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
7. Design and experiment of electronically controlled rotary flat flow valve with linear characteristics
Accession number: 20163802820523
Authors: Huang, Zhenwei (1, 2); Pan, Guobing (1); Ding, Fenfen (3); Xu, Zhipeng (3)
Author affiliation: (1) College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou; 310032, China; (2) Zhejiang Province Institute of Metrology, Hangzhou; 310018, China; (3) Zhejiang Provincial Key Laboratory of Flow Measurement Technology, China Jiliang University, Hangzhou; 310018, China
Corresponding author: Pan, Guobing(gbpan@zjut.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 333-338
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Gas flow valves are widely used in pneumatic field. The technology of valves, such as butterfly valves and ball valves, combined with valve positioner mode is mature, and the prices are reasonable. But there are some disadvantages like nonlinear relationship between the opening degree of the valve and flow area, low positioning accuracy, lack of repeatability and so on. A new rotary flat flow valve with linear characteristics was proposed. The nominal diameter was 50 mm. With good repeatability, it can overcome the above disadvantages on the whole. It can achieve the linear regulation of flow from 0% to 95%. A special shaped curve was designed for the valve plate to achieve the linear relationship. And a decelerating stepper motor was used to drive the valve plate to ensure the accuracy and repeatability of valve. It can also quickly adjust the valve plate to any position. The function of the curve of valve plate was deduced with cut-and-fill method. Then a special plane-rotation seal structure was proposed to ensure the plate seal. The computational fluid dynamics method was employed to simulate the internal fluid field of the valve at different opening positions. Finally, detailed simulation and experimental study were carefully carried out to verify the design and performance of valve. Both theoretical calculations and experiment results showed that the linear correlation coefficient was greater than 0.99. Experiment results at different positions showed that the flow repeatability of the valve was better than 0.26%. Although the performance of the new structure valve had been verified, the reliability of the special seal and working lifetime of the rotary flat valve were pending to be proved in the future work. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 19
Main heading: Structural design
Controlled terms: Computational fluid dynamics? - ?Experiments? - ?Flow of gases? - ?Plates (structural components)? - ?Stepping motors
Uncontrolled terms: Accuracy and repeatabilities? - ?Computational fluid dynamics methods? - ?Flow valves? - ?Linear characteristics? - ?Linear correlation coefficient? - ?Non-linear relationships? - ?Structure design? - ?Theoretical calculations
Classification code: 408.1 Structural Design, General
Structural Design, General
? - ?408.2 Structural Members and Shapes
Structural Members and Shapes
? - ?631.1.2 Gas Dynamics
Gas Dynamics
? - ?705.3 Electric Motors
Electric Motors
? - ?723.5 Computer Applications
Computer Applications
? - ?901.3 Engineering Research
Engineering Research
Numerical data indexing: Percentage 0.00e+00% to 9.50e+01%, Percentage 2.60e-01%, Size 5.00e-02m
DOI: 10.6041/j.issn.1000-1298.2016.08.044
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
8. Comparison of two crop evapotranspiration calculating approaches in CSM-CERES-Wheat model
Accession number: 20163802820502
Authors: Zheng, Zhen (1, 2); Cai, Huanjie (1, 2); Yu, Lianyu (1, 2); Wang, Jian (1, 2)
Author affiliation: (1) Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Chinese Arid Area Research Institute of Water-saving Agriculture, Northwest A&F University, Yangling; Shaanxi; 712100, China
Corresponding author: Cai, Huanjie(caihj@nwsuaf.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 179-191
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Crop water requirement is one of the most important factors in farmland water circulatory system, its accurate estimates could help with crop irrigation management. The ability of simulating evapotranspiration (ET) for CSM-CERES-Wheat model is very important, which determines the accuracy of model output parameters. The objective was to evaluate the capability of CSM-CERES-Wheat model to simulate the cumulative evapotranspiration, daily evapotranspiration and soil water content of winter wheat (Triticum aestivum L.) in 2011-2012 and 2012-2013 growing seasons under semi-arid condition. The daily ET was measured by using weighing lysimeter that installed in the experimental plot. The ability of CSM-CERES-Wheat model by using two different ET calculating approaches, i.e., Priestley-Taylor (PT) and Penman-Monteith (PM), and the simulation results were evaluated and compared. Data were obtained from two experiments with three irrigation levels that were conducted under controlled condition in a rain-out shelter in Yanling, Shaanxi Province of China during the 2011-2012 and 2012-2013 growing seasons. Results showed that the simulated cumulative ET, daily ET and soil water content of CSM-CERES-Wheat model with both PT and PM approaches had great agreement with measured values, and the simulated cumulative ET and daily ET were 5.4% and 3.4% less than those of observed values, respectively. The CSM-CERES-Wheat model simulated cumulative ET for winter wheat in two growing seasons through PT approach was less than that through PM approach, the relative difference between two approaches was ranged from -3.11% to -0.05%. The model could simulate soil water content correctly as well, in the depth of 0~20 cm soil layer, the RMSEn between simulated results based on two ET approaches and observed values was 39.38%, which was relatively high and not good, but below the 20 cm soil depth, the RMSEn between simulation results that based on two ET approaches and observed values was less than 23.1%, and the simulation results in depth of 40~60 cm soil layer got the best agreement with the observed values. The model with both PT and PM approaches simulated the above-ground biomass and grain yield accurately as well. The RMSEn of final above-ground biomass for two growing seasons were 13.57% for PT approach and 22.76% for PM approach, and RMSEn of grain yield were 11.80% for PT approach and 15.42% for PM approach, both of the simulated results had good agreement with observed values. The model using PT approach provided smaller ET and higher soil water content than those derived from PM approach as compared with measured data. Additionally, the model using PT approach provided higher final above-ground biomass and grain yield than those derived from PM approach as compared with measured data. However, the model with both two approaches could simulate the total above-ground biomass and grain yield with RMSEn within 25% of measured data. Overall, it can be concluded that the CSM-CERES-Wheat model using the two different approaches, i.e., PT and PM, was able to accurately simulate winter wheat ET and soil water content. The results also confirmed that the model could be applied in arid and semi-arid areas, and it can be used as a tool for agricultural water management and supplying the decision support for winter wheat growth in Guanzhong Plain. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 41
Main heading: Grain (agricultural product)
Controlled terms: Biomass? - ?Cardiovascular system? - ?Crops? - ?Decision support systems? - ?Evapotranspiration? - ?Irrigation? - ?Soil moisture? - ?Soils? - ?Water management
Uncontrolled terms: Above ground biomass? - ?Penman Monteith? - ?Priestley-Taylor? - ?Soil water content? - ?Yield
Classification code: 461.2 Biological Materials and Tissue Engineering
Biological Materials and Tissue Engineering
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?723 Computer Software, Data Handling and Applications
Computer Software, Data Handling and Applications
? - ?821.3 Agricultural Methods
Agricultural Methods
? - ?821.4 Agricultural Products
Agricultural Products
Numerical data indexing: Percentage -3.11e+00% to -5.00e-02%, Percentage 1.18e+01%, Percentage 1.36e+01%, Percentage 1.54e+01%, Percentage 2.28e+01%, Percentage 2.31e+01%, Percentage 2.50e+01%, Percentage 3.40e+00%, Percentage 3.94e+01%, Percentage 5.40e+00%, Size 0.00e+00m to 2.00e-01m, Size 2.00e-01m, Size 4.00e-01m to 6.00e-01m
DOI: 10.6041/j.issn.1000-1298.2016.08.023
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
9. Process and sequestration rate of carbon in soil particle-size fractions following conversion of cropland to forest in loess Hilly Region
Accession number: 20163802820495
Authors: Tong, Xiaogang (1, 2); Han, Xinhui (3); Li, Jiao (1); Ma, Jianye (1, 2)
Author affiliation: (1) College of Natural Resources and Environment, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling; Shaanxi; 712100, China; (3) College of Agronomy, Northwest A&F University, Yangling; Shaanxi; 712100, China
Corresponding author: Han, Xinhui(hanxinhui2011@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 117-124
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In the loess hilly region of China, a large amount of arable land has been replaced by artificial forests, resulting in increased storage of soil organic carbon (SOC). To elucidate the process and mechanisms of SOC sequestration following conversion of cropland to forest, the storage and sequestration rates of SOC associated with sand, silt and clay was measured by physical fractionation on Robinia (Robinia pseudoacacia L.) and Caragana (Caragana korshinskii) lands that have been stood on former cropland for 15~45 a. Compared with cropland, the content of carbon in all soil particle-size fractions on all afforested lands was significantly increased with the stand time. Moreover, the highest increase of carbon was in the top soil layer (0~10 cm) and similar increase amplitude of carbon was found in 10~60 cm soil layers. During the 15~45 a afforestation on former cropland, the highest annual sequestration rates of carbon stock in 0~20 cm soil depths was in silt, which were 0.21 Mg/(hm2·a) and 0.11 Mg/(hm2·a), and similar sequestration rate of carbon was in sand with average value of 0.13 Mg/(hm2·a) and in clay was 0.06 Mg/(hm2·a) on Robinia and Caragana lands, respectively. The same changing trend also occurred in 0~60 cm soil depth, and sequestration rate of carbon associated with all mineral particles was 1.6 to 2.5 times higher than those in 0~20 cm soil depth. Following the annual increase rates, the carbon stocks in sand, silt and clay were varied by 2.6, 1.1 and 0.8 times on Caragana land, and those were varied by 8.3, 2.2, 2.8 times on Robinia land respectively after 45 years conversion of cropland to forest. The average percentage that contributed to accumulation of total SOC in different mineral particles was in the order: silt carbon (51%) > clay carbon (26%) = sand carbon (23%). Additionally, there was a more significant linear correlation between SOC content and carbon management index (CMI) than the linear correlation between SOC content and activity of carbon pool (A). In conclusion, long term stand Robinia on former cropland sequestrated more SOC than stand Robinia in the area. However, carbon in slit was the main fraction for carbon sequestration and carbon in sand showed the fastest turnover rate on both afforested lands. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Organic carbon
Controlled terms: Forestry? - ?Particle size? - ?Reforestation? - ?Sand? - ?Sediments? - ?Silt? - ?Soils
Uncontrolled terms: Carbon management indices? - ?Carbon sequestration? - ?Loess hilly regions? - ?Particle-size fractions? - ?Physical fractionation? - ?Robinia pseudo-acacia? - ?Soil organic carbon? - ?Soil particle-size fractions
Classification code: 483 Soil Mechanics and Foundations
Soil Mechanics and Foundations
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?804.1 Organic Compounds
Organic Compounds
Numerical data indexing: Age 4.50e+01yr, Percentage 2.30e+01%, Percentage 2.60e+01%, Percentage 5.10e+01%, Size 0.00e+00m to 1.00e-01m, Size 0.00e+00m to 2.00e-01m, Size 0.00e+00m to 6.00e-01m, Size 1.00e-01m to 6.00e-01m
DOI: 10.6041/j.issn.1000-1298.2016.08.016
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
10. Effect of irrigation depth on root distribution and water use efficiency of jujube under indirect subsurface drip irrigation
Accession number: 20163802820491
Authors: Sun, Sanmin (1, 2); An, Qiaoxia (2); Yang, Peiling (1); Lu, Xiaobo (2); Gu, Kaikai (2)
Author affiliation: (1) College of Water Resources and Civil Engineering, China Agricultural University, Beijing; 100083, China; (2) College of Water Conservancy and Architecture Engineering, Tarim University, Alaer; 843300, China
Corresponding author: Yang, Peiling(yangpeiling@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 81-90
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To investigate the effects of installation depths of water-conduct device on root distribution and root growth in dwarf close planting jujube under indirect subsurface drip irrigation (ISDI), three installation depths of water-conduct device were considered in the experiment. The installation depths of water-conduct device were 20 cm (T1), 27 cm (T2) and 35 cm (T3), respectively, with surface drip irrigation (DI) as comparison. Different depths, horizontal distances of jujube roots system distribution were obtained by annular ditch layered methods, the results showed that there were significant differences in jujube roots system distribution under DI and ISDI. On root morphology, root distributions were shallow and horizontal extension under DI. The distribution of root in different soil layers was uniform, and growth direction of root was basically downward under ISDI. ISDI significantly increased the root length density of fine roots (d5 mm and root system distribution distance in horizontal direction were reduced, and the proportion of fine root length in 20~40 cm soil layer was increased. With the increase of depth of water-conduct device, the root length density of fine roots (d<2 mm) was decreased in 0~20 cm soil layer and increased gradually in 20~60 cm in vertical direction under ISDI. In horizontal direction, the fine root length density of each treatment was comparatively concentrated distribution in 0~20 cm soil layer,70% of root was distributed in horizontal range of 0 ~ 20 cm, the fine root distribution distance of each treatment was increased. With the increase of depth of water-conduct device, the horizontal distribution distances of roots of different diameter in 0~20 cm soil layer tended to be reduced, but that in 20~40 cm soil layer tended to be increased. Generally, with the increase of depth of water-conduct device, fine root distribution showed developing trend from shallow and wide to narrow and deep. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 30
Main heading: Irrigation
Controlled terms: Efficiency? - ?Plants (botany)? - ?Soils? - ?Subirrigation? - ?Underground structures
Uncontrolled terms: Irrigation depth? - ?Jujube tree? - ?Root? - ?Subsurface drip irrigation? - ?Water use efficiency
Classification code: 408.1 Structural Design, General
Structural Design, General
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?821.3 Agricultural Methods
Agricultural Methods
? - ?913.1 Production Engineering
Production Engineering
Numerical data indexing: Size 0.00e+00m to 2.00e-01m, Size 2.00e-01m, Size 2.00e-01m to 4.00e-01m, Size 2.00e-01m to 6.00e-01m, Size 2.70e-01m, Size 3.50e-01m
DOI: 10.6041/j.issn.1000-1298.2016.08.012
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
11. Estimation model of forest above-ground biomass based on PSO-LSSVM
Accession number: 20163802820515
Authors: Yang, Liu (1, 2); Sun, Jinhua (3); Feng, Zhongke (1); Yue, Depeng (1); Yang, Liyan (1)
Author affiliation: (1) Beijing Key Laboratory of Precision Forestry, Beijing Forestry University, Beijing; 100083, China; (2) College of Tourism and Planning, Pingdingshan University, Pingdingshan; 467000, China; (3) College of Geoscience and Surveying Engineering, China University of Mining and Techology, Beijing; 100083, China
Corresponding author: Feng, Zhongke(fengzhongke@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 273-279 and 287
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to improve the accuracy of forest above-ground biomass estimation, constructed from modeling factor selection and modeling aspects, a PSO-LSSVM biomass estimation method was proposed by considering comprehensive of the image texture features, topographical features, spectral features. Selecting Songshan Nature Reserve as study area, with the data sources from ZY-3 satellite remote sensing image, the measured data of 194 survey plots, forest resource inventory data, and the digital elevation model data, the Pearson correlation relationship was analyzed between 46 feature variables and forest above-ground biomass. With the optimal feature extraction variables chosen, the PSO-LSSVM model was established in Matlab 2014a. The determination coefficient (R2) and root mean square error (RMSE) were taken for comparative analysis of the accuracy of PSO-LSSVM model and multiple linear regression model. The results showed that the prediction accuracies (R2) of PSO-LSSVM model in coniferous forest, broadleaf forest and shrub were 0.867, 0.853 and 0.842, which were improved by 23.15%, 19.13% and 14.40% compared with the multiple linear regression model, respectively. The PSO-LSSVM model had self-study ability and adaptive capability, it can replace the traditional traversal optimization method, and it had great advantages on global optimization and convergence rate with small sample volume requirement and high precision accuracy. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Forestry
Controlled terms: Biomass? - ?Correlation methods? - ?Feature extraction? - ?Global optimization? - ?Image reconstruction? - ?Image texture? - ?Linear regression? - ?Mean square error? - ?Particle swarm optimization (PSO)? - ?Regression analysis ? - ?Remote sensing
Uncontrolled terms: Above ground biomass? - ?Determination coefficients? - ?Digital elevation model data? - ?Estimation models? - ?Forest resource inventory? - ?LSSVM? - ?Multiple linear regression models? - ?Satellite remote sensing
Classification code: 723.2 Data Processing and Image Processing
Data Processing and Image Processing
? - ?921.5 Optimization Techniques
Optimization Techniques
? - ?922.2 Mathematical Statistics
Mathematical Statistics
Numerical data indexing: Percentage 1.44e+01%, Percentage 1.91e+01%, Percentage 2.31e+01%
DOI: 10.6041/j.issn.1000-1298.2016.08.036
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
12. Influence of different proteins and their additive amounts on permittivities of milk
Accession number: 20163802820511
Authors: Guo, Wenchuan (1); Kong, Fanrong (1)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 248-254
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To understand the influence of different proteins and their additive amounts on permittivities of milk, and to explore a method for detecting the adulteration of milk protein, the open-ended coaxial-line probe technology was used to study the influence of frequency (20~4 500 MHz) and protein additive amounts (0~4.70%) of different proteins, including whey protein, soybean protein and tripolycyanamide, on permittivities (dielectric constant Ε’ and dielectric loss factor Ε″) of milk, and the influence mechanism of different proteins and their additive amounts on permittivities were analyzed. The results showed that over the frequency range of 20~4 500 MHz, Ε’ was decreased with the increase of frequency, and Ε″ decreased firstly and then increased with the increasing frequency. The minimum value of Ε″ observed at around 2 000 MHz. With the same protein additive amount, the milk added with soybean protein had the largest Ε’, while the milk added with tripolycyanamide had the smallest Ε’. Ε″ of the milk added with whey protein and soybean protein were higher than the values of milk with tripolycyanamide at the same protein additive amount. The permittivity values (Ε’ and Ε″) of milk were increased linearly with the increase of additive amounts of soybean and whey protein, and all the linear correlation coefficients were greater than 0.92. However, the correlation between the permittivities values and tripolycyanamide content was not obvious, and all the linear correlation coefficients were less than 0.51. The study results indicated that different proteins and their additive amounts had different influence on dielectric properties of milk, which made it possible to identify the different protein types and their additive amounts in milk based on dielectric properties. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Proteins
Controlled terms: Dielectric losses? - ?Dielectric properties? - ?Food additives? - ?Microwave measurement? - ?Permittivity
Uncontrolled terms: Dielectric parameters? - ?Milk? - ?Soybean proteins? - ?Tripolycyanamide? - ?Whey proteins
Classification code: 708.1 Dielectric Materials
Dielectric Materials
? - ?803 Chemical Agents and Basic Industrial Chemicals
Chemical Agents and Basic Industrial Chemicals
? - ?804.1 Organic Compounds
Organic Compounds
? - ?931.2 Physical Properties of Gases, Liquids and Solids
Physical Properties of Gases, Liquids and Solids
? - ?942.2 Electric Variables Measurements
Electric Variables Measurements
Numerical data indexing: Frequency 2.00e+07Hz to 4.50e+09Hz, Frequency 2.00e+09Hz, Percentage 0.00e+00% to 4.70e+00%
DOI: 10.6041/j.issn.1000-1298.2016.08.032
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
13. Bionic design and performance analysis of drum shaped wheel of mars rover
Accession number: 20163802820520
Authors: Zhang, Rui (1); Ji, Qiaoli (1); Yang, Mingming (1, 2); Li, Jianqiao (1)
Author affiliation: (1) Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun; 130022, China; (2) China South Railways Qishuyan Locomotive Vehicle Technology Research Institute Co., Ltd., Changzhou; 213000, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 311-316
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: It is important to enhance mobility performance of the Mars rover wheel in soft terrain. The didactyl foot, which is the key part of ostrich foot possessing the excellent running ability on sand, was regarded as the bionic prototype. According to the principle of engineering bionic, the wheel with bionic drum shaped surface moving on sand with high mobility performance was designed. A kind of Mars soil stimulants was selected as experimental material. The wheel-soil bin test system was adopted to test the tractive trafficability of ordinary drum shaped surface wheel and bionic drum shaped surface wheel. The rut morphology, drawbar pull and sinkage were regarded as evaluation indicators. Results showed that when the slip-rotation ratio was over 0.85, the rut accumulation phenomenon of ordinary drum shaped wheel was more serious than that of bionic drum shaped wheel. Under the same experimental conditions, when slip-rotation ratio was less than 0.42, the drawbar pull of ordinary drum shaped wheel was slightly larger than that of the bionic drum shaped wheel. When the slip-rotation ratio was over 0.42, the drawbar pull of the bionic drum shaped wheel was superior to the ordinary drum shaped wheel. The maximum drawbar pulls of bionic drum shaped wheel and ordinary drum shaped wheel were 11.6 N and 2.6 N, respectively. The slip-rotation ratio had small influence on sinkage of the ordinary drum shaped wheel, and the value of sinkage was about 35 mm. However, the sinkage of bionic drum shaped wheel was increased with the increase of slip-rotation ratio. This research provided a design way for enhancing the mobility performance of the Mars rover in soft terrain. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Wheels
Controlled terms: Bionics? - ?Birds? - ?Rotation? - ?Wakes
Uncontrolled terms: Bionic wheels? - ?Evaluation indicators? - ?Experimental conditions? - ?Experimental materials? - ?Mars Rovers? - ?Mobility performance? - ?Ostrich foot? - ?Trafficability
Classification code: 461.1 Biomedical Engineering
Biomedical Engineering
? - ?601.2 Machine Components
Machine Components
? - ?631.1 Fluid Flow, General
Fluid Flow, General
? - ?931.1 Mechanics
Mechanics
Numerical data indexing: Force 1.16e+01N, Force 2.60e+00N, Size 3.50e-02m
DOI: 10.6041/j.issn.1000-1298.2016.08.041
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
14. Effects of Different Flood Regimes on Soil Erosion and Sediment Transport in Typical Small Watershed of Loess Hilly-Gully Region
Accession number: 20163802820494
Authors: Zhang, Letao (1, 2); Li, Zhanbin (1, 3); Xiao, Junbo (4); Wang, Shanshan (1, 2)
Author affiliation: (1) State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Ministry of Water Resources, Yangling; Shaanxi; 712100, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Key Laboratory of Northwest Water Resources and Environment Ecology, Ministry of Education, Xi’an University of Technology, Xi’an; 710048, China; (4) Institute of Soil and Water Conservation, Northwest A&F University, Yangling; Shaanxi; 712100, China
Corresponding author: Li, Zhanbin(zbli@ms.iswc.ac.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 109-116
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Soil erosion responses under different rainfall and runoff patterns are fundamentals for the studies of soil erosion mechanisms. To investigate the influence of flood regimes on soil erosion and sediment yield at small watershed scale, a typical small watershed-Shejiagou catchment was selected to conduct data collection and analysis, and Shejiagou is a first order tributary of Chabagou drainage basin lying in the hilly and gully region of Chinese Loess Plateau. Based on 45 individual flood events recorded at Shejiagou Hydrological Station during 1961 to 1969, all the flood events were categorized into three regimes through a combined approach of K-mean clustering and discriminant analysis with three grouping variables, including flood duration, event flood runoff depth and peak discharge. Regime A was characterized by short duration, small flood runoff depth, low flood variability and medium peak discharge, which was the most common regime. Regime B was featured with medium duration, medium flood runoff depth, medium flood variability and small peak discharge, which was of medium frequency. Regime C mainly included flood events of long duration, large runoff depth, high variability, as well as large peak discharge, which was of the lowest frequency. The regime of flood events was mainly controlled by flood duration at the studied scale. Area-specific sediment yield, mean suspended sediment concentration and maximum suspended sediment concentration driven by different flood regimes can be ranked in the order of C>B>A, C>A>B, C>A>B, respectively. However, no significant difference was found among the three flood regimes for the variables examined (P>0.1). The runoff-sediment relationship was relatively constant at Shejiagou watershed, the variations in suspended sediment concentration can be well described by the logarithmic function of instantaneous discharge. The sediment output at watershed outlet was mainly controlled by event-based total flood runoff. Given that event flood runoff depth was kept constant, the ratio of area-specific sediment yield driven by different flood regimes (ABC) was 10.931.22. If the flood duration was increased by 1.7 times, the flood regime-based increase for sediment yield reached the maximum, and the maximum increase rate for area-specific sediment yield was 22%. The results may provide beneficial evidence for categorization of individual flood events, and overall rational-based evaluation on the soil and water conservation benefits brought by runoff regulation systems at watershed scale. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 32
Main heading: Floods
Controlled terms: Catchments? - ?Clustering algorithms? - ?Discriminant analysis? - ?Erosion? - ?Landforms? - ?Runoff? - ?Sediment transport? - ?Sedimentation? - ?Sediments? - ?Soil conservation ? - ?Soils? - ?Suspended sediments? - ?Water conservation? - ?Watersheds
Uncontrolled terms: Chinese Loess Plateau? - ?Loess hilly gully region? - ?Runoff regulations? - ?Sediment yields? - ?Small watersheds? - ?Soil and water conservation? - ?Specific sediment yield? - ?Suspended sediment concentrations
Classification code: 444 Water Resources
Water Resources
? - ?444.1 Surface Water
Surface Water
? - ?481.1 Geology
Geology
? - ?483 Soil Mechanics and Foundations
Soil Mechanics and Foundations
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?802.3 Chemical Operations
Chemical Operations
? - ?903.1 Information Sources and Analysis
Information Sources and Analysis
Numerical data indexing: Percentage 2.20e+01%
DOI: 10.6041/j.issn.1000-1298.2016.08.015
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
15. Effects of calcium-based catalyst/absorbent on hydrogen production of corn stalk pyrolysis-gasification
Accession number: 20163802820506
Authors: Li, Bin (1, 2); Han, Xu (1); Chen, Yilong (1); Wei, Liangyuan (2); Yang, Haiping (2); Chen, Hanping (2)
Author affiliation: (1) State Key Laboratory of Biomass Thermal Chemistry and Technology, Sunshine Kaidi New Energy Group Co., Ltd., Wuhan; 430074, China; (2) State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan; 430074, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 216-220
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The influence of calcium-based catalyst/absorbent on hydrogen production of corn stalk pyrolysis-gasification was investigated in a two-stage fixed-bed biomass pyrolysis-gasification system. the results showed that addition of CaO could in-situ absorb CO2generated from the gasification process, thus enhanced the gasification process to form more H2. As the pyrolysis/gasification temperature was 650°C, mass ratio of steam to biomass (S/B) was 2, and molar ratio of CaO to C was 1, compared with the trail without CaO addition, H2concentration in the product gas was increased greatly from 28.7% to 56.2%, H2yield was increased from 64.3 mL/g to 195.8 mL/g, while CO2concentration was decreased sharply from 21.5% to 1.1%. CaCO3could be found in the used absorbent after gasification, which further proved the enhancing effect of CaO addition. Moreover, the enhancing effect of CO2absorption of CaO was closely related to the gasification temperature. High H2concentration and yield could be obtained with gasification temperature in the range of 600 to 700 from the pyrolysis-gasification of corn stalk. As gasification temperature higher than 700, the CO2absorption capability of CaO was weakened, CaO mainly acted as a catalyst during the gasification process. The introduction of active NiO to CaO absorbent could decrease the content of small molecular hydrocarbon gases in the product gas, and increase the H2concentration and yield. With NiO loading of 10% on CaO, H2concentration in product gas could achieve 63.7%, while H2yield was close to double of that with CaO addition, which reached 341.3 mL/g. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Hydrogen production
Controlled terms: Absorption? - ?Calcium? - ?Calcium carbonate? - ?Carbon dioxide? - ?Catalysts? - ?Gasification? - ?Pyrolysis
Uncontrolled terms: Absorption capability? - ?Biomass pyrolysis? - ?Catalytic effects? - ?Corn stalk? - ?Enhancing effect? - ?Gasification process? - ?Gasification temperatures? - ?Pyrolysis gasifications
Classification code: 522 Gas Fuels
Gas Fuels
? - ?549.2 Alkaline Earth Metals
Alkaline Earth Metals
? - ?802.2 Chemical Reactions
Chemical Reactions
? - ?802.3 Chemical Operations
Chemical Operations
? - ?804 Chemical Products Generally
Chemical Products Generally
? - ?804.2 Inorganic Compounds
Inorganic Compounds
Numerical data indexing: Percentage 1.00e+01%, Percentage 2.15e+01% to 1.10e+00%, Percentage 2.87e+01% to 5.62e+01%, Percentage 6.37e+01%, Temperature 9.23e+02K
DOI: 10.6041/j.issn.1000-1298.2016.08.027
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
16. Dynamic optimization of damping anti-vibration structure topology based on BESO method
Accession number: 20163802820524
Authors: He, Honglin (1); Tao, Jie (1); Liu, Yaodi (1); Xia, Ziqiang (1)
Author affiliation: (1) School of Aeronautical Manufacturing, Nanchang Hangkong University, Nanchang; 330063, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 339-345 and 412
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to lay a certain foundation for optimization of mechanical structure vibration reduction, the viscoelastic damping material optimal layout was studied. Damping materials dosage was restricted to realize structural lightweight design. Based on the Hamilton variation principle and the deformation displacement relationship of damping structure, structure vibration differential equation was deduced. A topological optimization mathematical model for constrained damping structure that used structure maximum damping ratio as the optimization goal, structure damping materials consumption as constraint condition, structure damping element status as design variables was built. To search structure topological optimization iteration direction, the modal damping ratio of sensitivity was derived. The constrained damping element adding and deleting criterion was presented, the program for constrained damping structure was established, and independent mesh filter method was adopted to avoid the checkerboard. The bi-directional evolutionary structural optimization (BESO) can improve the utilization efficiency of damping materials, thus BESO was used to optimize the damping structure. After evolutionary structural optimization(ESO) for damping structure, the increases of the first and the third order damping ratios were 54.51% and 36.21%, respectively, while after BESO for damping structure, the increases were 76.69% and 58.36%, respectively, and the phenomenon of checkerboard was improved, the damping material layout was consistent with structural strain energy figure. To verify the result of topology optimization for damping layout, harmonic response analysis was carried out on the constrained layer damping structure, the simulation results showed that the structural response amplitude was low and vibration suppression effect was good by means of BESO method. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 19
Main heading: Structural optimization
Controlled terms: Constrained optimization? - ?Damping? - ?Differential equations? - ?Iterative methods? - ?Shape optimization? - ?Strain energy? - ?Topology? - ?Vibration analysis? - ?Vibrations (mechanical)
Uncontrolled terms: Antivibration? - ?Bi-directional evolutionary structural optimizations? - ?Dynamic optimization? - ?Evolutionary structural optimization? - ?Hamilton variation principle? - ?Harmonic response analysis? - ?Modal damping ratios? - ?Viscoelastic damping materials
Classification code: 921 Mathematics
Mathematics
? - ?931.1 Mechanics
Mechanics
? - ?961 Systems Science
Systems Science
Numerical data indexing: Percentage 3.62e+01%, Percentage 5.45e+01%, Percentage 5.84e+01%, Percentage 7.67e+01%
DOI: 10.6041/j.issn.1000-1298.2016.08.045
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
17. Dynamic behavior and its optimization of robot under randomly uncertain disturbance
Accession number: 20163802820526
Authors: Ding, Changtao (1, 2); Yang, Shixi (1, 2); Gan, Chunbiao (1, 2)
Author affiliation: (1) The Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, Zhejiang University, Hangzhou; 310027, China; (2) College of Mechanical Engineering, Zhejiang University, Hangzhou; 310027, China
Corresponding author: Gan, Chunbiao(cb_gan@zju.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 356-363 and 398
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The dynamic behavior and its optimization of a planar 3-link biped robot under randomly uncertain disturbance were investigated. Based on the biped kinematic model and hybrid dynamic model under ideal situation, the control objective function and HZD (Hybrid zero dynamics) feedback control were firstly established, from which the biped state parameters were optimized with the energy consumption function, and the robotic stable walking under the ideal situation was achieved. Secondly, the biped kinematic model and hybrid dynamic model under the randomly uncertain disturbance were established, from which the robotic dynamic behavior controlled by the HZD feedback control method was investigated under the randomly uncertain disturbance. Finally, taking the randomly uncertain disturbance into account, the disturbance compensator integrated into the HZD feedback control was constructed based on a back propagation neural network, and a novel BPNN-HZD (Back propagation neural network-hybrid zero dynamics) feedback control method was proposed to optimize the biped dynamic behavior. The dynamic simulation results and the stick figures showed that the planar 3-link biped robot would gradually appear divergent dynamic behavior if the randomly uncertain disturbance could not be well compensated, while the BPNN-HZD feedback control can effectively weaken the randomly uncertain disturbance effect on the dynamical response of robot, and the biped divergent dynamic behavior would be avoided. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Feedback
Controlled terms: Backpropagation? - ?Biped locomotion? - ?Dynamic models? - ?Energy utilization? - ?Feedback control? - ?Kinematics? - ?Neural networks? - ?Robotics? - ?Robots? - ?Torsional stress
Uncontrolled terms: Back propagation neural networks? - ?Biped Robot? - ?Disturbance compensator? - ?Dynamic behaviors? - ?Feedback control methods? - ?Hybrid dynamic modeling? - ?Hybrid zero dynamics? - ?Uncertain disturbances
Classification code: 461.3 Biomechanics, Bionics and Biomimetics
Biomechanics, Bionics and Biomimetics
? - ?525.3 Energy Utilization
Energy Utilization
? - ?723.4 Artificial Intelligence
Artificial Intelligence
? - ?731.1 Control Systems
Control Systems
? - ?731.5 Robotics
Robotics
? - ?921 Mathematics
Mathematics
? - ?931.1 Mechanics
Mechanics
DOI: 10.6041/j.issn.1000-1298.2016.08.047
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
18. Quantitative evaluation approach of cloud capability service for knowledge in cloud manufacturing
Accession number: 20163802820522
Authors: Yin, Yanchao (1); Niu, Hongwei (1)
Author affiliation: (1) Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming; 650500, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 325-332 and 355
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Cloud manufacturing is a new service-oriented intelligent manufacturing model, which contains plentiful knowledge to support service system operating, and the manufacturing resources and capabilities are shared (as services) through the internet. However, there is a lack of in-depth research in knowledge cloud capability service, influence factors and its evaluation approach. The comprehensive evaluation system of the whole features was established for knowledge cloud capability service, and a new quantificational knowledge cloud capability evaluation approach was presented based on cloud reasoning. The expected value and hyper entropy of knowledge capability cloud were used to evaluate the satisfaction of service performance by cloud processing the evaluation indicators, and a cloud reasoning controller was designed to depict the satisfaction change style of knowledge capability, which provided support for the intelligent shared service of manufacturing resources and capability in cloud manufacturing system, e.g. design as a service, simulation as a service, production as a service, assembling as a service, and testing as a service. The result of simulating experiments showed that the validity and effectiveness of the presented approach provided beneficial exploration for evaluating knowledge cloud capability service of cloud manufacturing. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Manufacture
Controlled terms: Computer aided manufacturing
Uncontrolled terms: Cloud Manufacturing? - ?Cloud reasonings? - ?Comprehensive evaluation? - ?Comprehensive evaluation system? - ?Intelligent Manufacturing? - ?Quantitative evaluation? - ?Service performance? - ?Simulating experiments
Classification code: 537.1 Heat Treatment Processes
Heat Treatment Processes
? - ?723.5 Computer Applications
Computer Applications
DOI: 10.6041/j.issn.1000-1298.2016.08.043
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
19. Structure design and displacement analysis of 3T1R parallel mechanism
Accession number: 20163802820527
Authors: Shi, Zhixin (1); Ye, Meiyan (2); Luo, Yufeng (1); Yang, Tingli (3)
Author affiliation: (1) School of Mechanical & Electronic Engineering, Nanchang University, Nanchang; 330031, China; (2) School of Science, Nanchang University, Nanchang; 330031, China; (3) Jinling Petrochemical Corporation, Nanjing; 210037, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 364-369
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The parallel manipulator with three-dimension translation and one-dimension rotation (in short, 3T1R) has wide requirements in processing technology, such as high-speed catch, positioning assembly, transportation. A novel 3T1R parallel manipulator was presented based on the theory of position and orientation characteristics (in short, POC). A complete type synthesis of parallel manipulator that can perform 3T1R motion was made based on the theory of POC. Then, one topology was selected from the different possibilities of parallel manipulators after imposing some practical requirements. The selected parallel manipulator was composed of four identical arms and a single platform, and the composite parallelogram structure in each arm brought in better limb stiffness. The parallel manipulator had characteristics of full symmetry, fold ability, good stiffness, large work space, and so on. In addition, the forward and inverse displacement equations of the parallel manipulator were derived, which had great importance when implemented in velocity control. The inverse position equation had 16 solutions at most, and the forward position equation only had 8 solutions at most. Finally, the solution algorithm of the forward displacement equations was given, and a numerical example was provided to confirm the efficiency of the solution procedure. The research results had a reference value for follow-up studies of the new manipulator and its application. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 18
Main heading: Manipulators
Controlled terms: Mechanisms? - ?Stiffness
Uncontrolled terms: Displacement analysis? - ?Forward displacements? - ?Inverse displacements? - ?Parallel manipulators? - ?Position and orientations? - ?Practical requirements? - ?Processing technologies? - ?Structure characteristic
Classification code: 601.3 Mechanisms
Mechanisms
? - ?951 Materials Science
Materials Science
DOI: 10.6041/j.issn.1000-1298.2016.08.048
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
20. Influencing factors of soil infiltration rate and its estimation model at runoff-plot scale
Accession number: 20163802820501
Authors: Huang, Jun (1); Jin, Pingwei (1, 2); Li, Min (3); Li, Lanbin (1, 2); Jiang, Xuebing (1, 2)
Author affiliation: (1) Pearl River Hydraulic Research Institute, Pearl River Water Resources Commission, Guangzhou; 510611, China; (2) Soil and Water Conservation Monitoring Center of Pearl River Basin, Pearl River Water Resources Commission, Guangzhou; 510611, China; (3) Department of Soil Science, University of Saskatchewan, Saskatoon; S7H2C5, Canada
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 171-178
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Based on the hydrological process, several factors affecting the mean soil infiltration rate (im) under the individual rainfall event were determined, which were the slope gradient (S), slope length (L), rainfall intensity (Ri), rainfall amount (Rain), vegetation cover of the land surface (Vc), antecedent soil water content (Asw) and fractal dimension of soil particle (D). Using the data obtained from the field runoff-plot under natural rainfall events, the quantitative relationships between imand the seven factors were analyzed, and the multi-parameter estimation model for imwas established by means of multivariate nonlinear regression method and BP neural network model. Relationship between imand S was in accord with quadratic parabola, and imwas firstly increased and then decreased with increase of S. The imwas increased linearly with the increase of L and Ri, it was increased with the increase of Rainby power function and linearly decreased with increase of D. Hyperbolic functions were obtained between imand Vc, Asw, and the imwas increased with increase of Vcand decreased with increase of Asw. On the strength of the seven functional relationships, the estimation model of imwas built by multivariate nonlinear regression method. The relative error of around 72% data was within ±10%. Using the seven factors as input parameters, a BP neural network model for prediction of imwas established. The best training algorithm was Levenberg-Marquardt method and the ideal neurons nodes of the hidden layer were determined as 15 by the grey relational degree method. The relative error of around 81% data was within ±10%. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 35
Main heading: Infiltration
Controlled terms: Fractal dimension? - ?Hyperbolic functions? - ?Neural networks? - ?Nonlinear analysis? - ?Rain? - ?Regression analysis? - ?Runoff? - ?Soil moisture? - ?Soils
Uncontrolled terms: BP neural network model? - ?Functional relationship? - ?Grey relational degree? - ?Hydrological process? - ?Levenberg-Marquardt method? - ?Multivariate non-linear regression? - ?Multivariate nonlinear? - ?Soil infiltration
Classification code: 442.1 Flood Control
Flood Control
? - ?443.3 Precipitation
Precipitation
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?921 Mathematics
Mathematics
? - ?922.2 Mathematical Statistics
Mathematical Statistics
Numerical data indexing: Percentage 7.20e+01%, Percentage 8.10e+01%
DOI: 10.6041/j.issn.1000-1298.2016.08.022
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
21. Structural synthesis based on POC set for lower-mobility non-overconstrained parallel mechanisms
Accession number: 20163802820528
Authors: Zhu, Xiaorong (1); Song, Yueyue (1); Shen, Huiping (1); Yao, Xin (1); Sun, Chen (1); Yang, Tingli (1)
Author affiliation: (1) School of Mechanical Engineering, Changzhou University, Changzhou; 213164, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 370-377
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Based on the theory of POC and ordered single-opened-chain, a design method for structural synthesis of lower-mobility non-overconstrained parallel mechanisms (PMs) was proposed according to the over-constraint characteristics of independent loops. Firstly, the relationships between POC of mobile platform, POC of kinematic limbs and the number of independent displacement equations of independent loops were analyzed. The existence condition of lower-mobility non-overconstrained PMs was obtained, and the universal method and step for structural synthesis were further proposed. Secondly, the non-overconstrained PMs can be classified into three types of configurations according to different combinations of kinematic limbs and their corresponding constraints on the platform, which showed that the non-overconstrained PMs composed with different types of kinematic limbs had different performances. Finally, the rules of possible kinematic limbs and their assembly modes were illustrated by comparative analysis with a few examples. The research results enriched the analysis theory and methods of non-overconstrained PMs, and laied the foundation for type selection and applications of lower-mobility non-overconstrained PMs. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Mechanisms
Controlled terms: Kinematics
Uncontrolled terms: Comparative analysis? - ?Displacement equation? - ?Existence conditions? - ?Over-constraint? - ?Parallel mechanisms? - ?Single-opened-chain? - ?Structural condition? - ?Structural synthesis
Classification code: 601.3 Mechanisms
Mechanisms
? - ?931.1 Mechanics
Mechanics
DOI: 10.6041/j.issn.1000-1298.2016.08.049
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
22. Tests on anti-wind erosion in different restoration modes of desertification grassland at test zone in Siziwang Banner
Accession number: 20163802820500
Authors: Xuan, Chuanzhong (1); Chen, Zhi (1); Liu, Haiyang (1); Song, Tao (1); Xue, Jing (1); Liang, Tianyu (2)
Author affiliation: (1) College of Machine and Electronics Engineering, Inner Mongolia Agricultural University, Huhhot; 010018, China; (2) College of Ecology and Environmental Science, Inner Mongolia Agricultural University, Huhhot; 010019, China
Corresponding author: Chen, Zhi(sgchenzhi@imau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 164-170
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to provide technical basis for prevention of desertification grassland in agro-pastoral ecotone in Siziwang banner, Inner Mongolia, the in-situ test was adopted to study the blown sand movement laws and explore the mechanism and protection effect of soil wind erosion for degraded grassland with 20% coverage, repaired grassland with 40% coverage of Caragana korshinskili gapped belt scheme plantation and 60% coverage of Agropyron mongolicum randomly distributed plantation, the movable wind erosion tunnel and its supplement equipment were used. The results indicated that, at the same wind speed in the wind tunel, the descending order of soil surface roughness was C. korshinskili grassland, A. mongolicum grassland and degraded grassland. The average roughness of C. korshinskili grassland was 2.46 cm, which was 1.95 times of A. mongolicum grassland and 2.76 times of degraded grassland. With the decrease of height from the ground, all the wind speeds of three grasslands were decreased, and when wind speed was 9 m/s in wind tunnel, wind velocities at height of 8 cm were reduced by 82.23%, 66.67% and 61.11% for C. korshinskili grassland, A. mongolicum grassland and degraded grassland compared with those at height of 64 cm, respectively. The sand transport rate of C. korshinskili grassland was the smallest, and the sand transport rate curves of A. mongolicum grassland and degraded grassland were decayed in the form of exponential function along with the increase of height from ground, and the curve of degraded grassland was decayed faster. Whereas, the sand transport rate curve of C. korshinskili grassland had a maximum value at its top of 30 cm, and it was exponentially decayed under its top. Therefore, the C. korshinskili grassland had significant effects on obstructing and changing wind-sand flow, and it could still achieve good anti-erosion effect at low vegetation coverage. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Soil testing
Controlled terms: Climatology? - ?Coastal engineering? - ?Erosion? - ?Exponential functions? - ?Sand? - ?Surface roughness? - ?Wind? - ?Wind tunnels
Uncontrolled terms: Agro-pastoral ecotones? - ?Protection effect? - ?Randomly distributed? - ?Sand transport rate? - ?Soil surface roughness? - ?Vegetation coverage? - ?Wind erosions? - ?Wind profiles
Classification code: 407.3 Coastal Engineering
Coastal Engineering
? - ?443 Meteorology
Meteorology
? - ?443.1 Atmospheric Properties
Atmospheric Properties
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?651.2 Wind Tunnels
Wind Tunnels
? - ?921 Mathematics
Mathematics
? - ?931.2 Physical Properties of Gases, Liquids and Solids
Physical Properties of Gases, Liquids and Solids
Numerical data indexing: Percentage 2.00e+01%, Percentage 4.00e+01%, Percentage 6.00e+01%, Percentage 6.11e+01%, Percentage 6.67e+01%, Percentage 8.22e+01%, Size 2.46e-02m, Size 3.00e-01m, Size 6.40e-01m, Size 8.00e-02m, Velocity 9.00e+00m/s
DOI: 10.6041/j.issn.1000-1298.2016.08.021
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
23. Three-dimensional template resource library construction of maize organs
Accession number: 20163802820514
Authors: Wen, Weiliang (1, 2); Guo, Xinyu (2, 3); Lu, Xianju (2, 3); Wang, Yongjian (2, 3); Zhao, Deda (2, 3); Liao, Weihua (2, 3)
Author affiliation: (1) College of Computer Science, Beijing University of Technology, Beijing; 100124, China; (2) Beijing Research Center for Information Technology in Agriculture, Beijing; 100097, China; (3) Beijing Key Laboratory of Digital Plant, Beijing; 100097, China
Corresponding author: Guo, Xinyu(guoxy@nercita.org.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 266-272
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to provide three dimensional (3D) models with complete agronomic information and high fidelity for the construction of digital maize system, a 3D template resource library of maize organs was constructed. Firstly, maize plants were subdivided into basic structural units, including nodal root, lateral root, mesocotyl, stems, sheath, leaf, tassel and ear. Secondly, the data acquisition standard of major maize organs was established from the perspective of 3D data acquisition by analyzing the morphological and structural features of the organs. 3D data of the maize organs were acquired by using 3D scanners and 3D digitizers according to the standard, and geometric models of the maize organs were constructed on the basis of the measured 3D data. Finally, the 3D template resource library of maize organs was constructed by assembling these geometric models. The library took cultivar, organ name, growth period etc. as its key words for resource retrieval. It contained a large number of maize organ models of different cultivars and multiple growth periods with consistent agronomic parameters. The construction of the library would promote the digital maize system and played a great role in the research, production, promotion and demonstration of maize industry, it also provided a reference for the 3D resource library construction of other plants. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Digital libraries
Controlled terms: Agronomy? - ?Data acquisition? - ?Geometry? - ?Plants (botany)
Uncontrolled terms: 3D data acquisition? - ?Agronomic parameters? - ?Maize organ? - ?Resource libraries? - ?Resource retrieval? - ?Structural feature? - ?Three dimensions? - ?Three-dimensional (3D) model
Classification code: 723.2 Data Processing and Image Processing
Data Processing and Image Processing
? - ?723.5 Computer Applications
Computer Applications
? - ?821.3 Agricultural Methods
Agricultural Methods
? - ?921 Mathematics
Mathematics
DOI: 10.6041/j.issn.1000-1298.2016.08.035
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
24. Design and test of portable automatic vegetable seeding machine
Accession number: 20163802820481
Authors: Zhu, Pan’an (1); Li, Jianping (2); Lou, Jianzhong (3); Han, Zhiying (4)
Author affiliation: (1) Wenzhou Vocational College of Science and Technology, Wenzhou; 325006, China; (2) Department of Biological Systems Engineering, Zhejiang University, Hangzhou; 310029, China; (3) College of Mechanical Engineering, Zhejiang Institute of Mechanical & Electrical Engineering, Hangzhou; 310053, China; (4) Key Laboratory of Equipment and Informatization in Environment Controlled, Ministry of Agriculture, Hangzhou; 310029, China
Corresponding author: Li, Jianping(jpli@zju.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 7-13
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: With the development of specialization and large-scale vegetable planting in China, factory seeding was widely used, and there was high requirement for sowing. Vegetable tray seeding machinery is one of the core equipment of vegetable seedling. In order to solve the problems of low productivity, high labor intensity in manual seeding and the current planting machine being not suitable for the need of small and medium sized planting greenhouses in China, the automatic seeding device used in greenhouses was designed on the base of the analysis of characteristic parameters of rape and cucumber seeds. One side of the seeding device can be folded in order to carry it easily. The size of folded seeding machine was 500 mm×500 mm×750 mm.The device was designed with a multifunctional integrated structure, including hole-punching and seeding, which simplified the working procedure. Both the hole-punching and seeding can be achieved accurately through detecting the position of the notch in the tray by laser sensor. The success rate of seed adsorption was an important factor of seeding machine. The success rate of adsorption would directly affect the success rate and production efficiency of seeding machine. Experimental results showed that the size of suction head had effect on suction success rate when pressure was decided. The suction success rate was high when the diameter of suction head was within 0.6~1.2 mm and the vacuum degree was 8 kPa. Selecting the diameter of 0.6 mm,the success rate reached over 90% when pressure was higher than 6.2 kPa for rape seeds and 8.3 kPa for cucumber seeds. By orthogonal experiment, it was found that the best adsorption effect was with vacuum degree of 10 kPa and diameter of 0.6 mm. Compared with manual seeding, the efficiency of seeding machine was improved by 12.9 times. The research provided a new structure and design idea to solve problem in seeding. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 19
Main heading: Seed
Controlled terms: Adsorption? - ?Computer software portability? - ?Design? - ?Efficiency? - ?Greenhouses? - ?Machinery? - ?Punching? - ?Vegetables
Uncontrolled terms: Adsorption effect? - ?Integrated structure? - ?Orthogonal experiment? - ?Production efficiency? - ?Rate of adsorption? - ?Tray? - ?Vegetable seedlings? - ?Working procedure
Classification code: 723 Computer Software, Data Handling and Applications
Computer Software, Data Handling and Applications
? - ?802.3 Chemical Operations
Chemical Operations
? - ?821.4 Agricultural Products
Agricultural Products
? - ?821.6 Farm Buildings and Other Structures
Farm Buildings and Other Structures
? - ?913.1 Production Engineering
Production Engineering
Numerical data indexing: Percentage 9.00e+01%, Pressure 1.00e+04Pa, Pressure 6.20e+03Pa, Pressure 8.00e+03Pa, Pressure 8.30e+03Pa, Size 6.00e-04m to 1.20e-03m, Size 6.00e-04m
DOI: 10.6041/j.issn.1000-1298.2016.08.002
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
25. Topological structure characteristics analysis for typical and practical parallel mechanisms
Accession number: 20163802820324
Authors: Shen, Huiping (1); Zeng, Qingfei (1); Li, Ju (1); Yin, Hongbo (1); Zhu, Xiaorong (1)
Author affiliation: (1) Research Center for Advanced Mechanism Theory, Changzhou University, Changzhou; 213016, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 388-398
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Development and practical application for practical parallel mechanisms still have a long way to go, the reason is that the topological structure characteristics of the mechanisms are to be revealed. The purpose of topological structure characteristics analysis is to provide criteria for optimization and performance assessment of parallel mechanisms. Using topology structure theory for parallel mechanism based on position and orientation characteristics (POC) and the ordered single-open-chain (SOC), the topology characteristics of six practical and useful parallel mechanisms were analyzed, and three main topological structure characteristics, including the POC set, degree of freedom (DOF) and coupling degree were uncovered. Analysis for topological structure characteristics was an effective method to reveal the structure composition and the topological structure characteristics of mechanisms. The best structural decomposition route can be achieved with the concept of “coupling degree”, the complexity caused for forward kinematic analysis of the mechanisms can be reduced and the forward position solutions of mechanisms can be analyzed efficiently. These characteristics reflected the basic performance of the topological structure, kinematics and dynamics of these mechanisms, which provided theoretical foundation for the optimization of topological structure, kinematics and dynamics as well as application. Topological structural analysis of practical parallel mechanisms can provide comparable schemes for innovative mechanism designs. This work also revealed some general rules which can be beneficial to the design and application for any other parallel mechanisms. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Structural optimization
Controlled terms: Chains? - ?Degrees of freedom (mechanics)? - ?Kinematics? - ?Machine design? - ?Mechanisms? - ?Topology
Uncontrolled terms: Characteristics method? - ?Open chain? - ?Parallel mechanisms? - ?Topological characteristics? - ?Topological structure analysis
Classification code: 601 Mechanical Design
Mechanical Design
? - ?601.3 Mechanisms
Mechanisms
? - ?602.1 Mechanical Drives
Mechanical Drives
? - ?921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory
Combinatorial Mathematics, Includes Graph Theory, Set Theory
? - ?921.5 Optimization Techniques
Optimization Techniques
? - ?931.1 Mechanics
Mechanics
DOI: 10.6041/j.issn.1000-1298.2016.08.051
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
26. Experiment and calculation of fluid pressure in pump chamber and balance cavity of centrifugal pump
Accession number: 20163802820486
Authors: Liu, Zailun (1); Wang, Dongwei (1, 2); Hou, Yihua (1); Ma, Xijin (1)
Author affiliation: (1) College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; (2) Engineering Institute of Wenzhou Pump & Valve, Lanzhou University of Technology, Wenzhou; 325105, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 42-47 and 324
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A special testing apparatus was designed for measuring and calculating fluid pressure in pump chamber and balance cavity, fluid pressure in front-back pump chambers was measured and analyzed by changing balance hole diameter and using a pressure sensor. It was found that liquid pressure in back cavity was generally bigger than that in front cavity under normal conditions of seal ring,and the curves of fluid pressure in front-back pump chamber above the diameter of seal ring were different. Based on systematical analysis of pressure curve of pump chamber with or without fluid leakage, the computational formula of fluid pressure in pump chamber with fluid leakage was presented by introducing pressure loss coefficient under the design condition. The fitting formulas of pressure loss coefficient were given by calculation of experimental data under the design condition. Moreover, the theoretical calculation results and the experiment results of fluid pressure in pump chamber with fluid leakage had also been contrasted and analyzed for two centrifugal pumps. The results showed that the computational formula of fluid pressure in pump chamber with fluid leakage had high credibility. Fluid pressure in balance cavity was calculated using mathematics model under the design condition. The experiment results proved that this mathematics model could accurately forecast fluid pressure in pump chamber. In order to control the fluid leakage and reduce the axial thrust, it was proposed that the balance holes diameter of 6~8 mm was appropriate through analyzing the theoretical calculation results and experimental results. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 16
Main heading: Seals
Controlled terms: Calculations? - ?Centrifugal pumps? - ?Experiments? - ?Flow control? - ?Mathematical models? - ?Pumps
Uncontrolled terms: Computational formula? - ?Fluid pressures? - ?Mathematics model? - ?Pressure loss coefficient? - ?Pump chambers? - ?Systematical analysis? - ?Testing apparatus? - ?Theoretical calculations
Classification code: 618.2 Pumps
Pumps
? - ?619.1.1 Pipe Accessories
Pipe Accessories
? - ?631.1 Fluid Flow, General
Fluid Flow, General
? - ?901.3 Engineering Research
Engineering Research
? - ?921 Mathematics
Mathematics
Numerical data indexing: Size 6.00e-03m to 8.00e-03m
DOI: 10.6041/j.issn.1000-1298.2016.08.007
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
27. Kinematic performance of mechanism for lunar soil sampling test
Accession number: 20163802820326
Authors: Guo, Zonghuan (1); Xie, Zhijiang (1); Zheng, Yanhong (2); Qi, Kai (1); Yuan, Yuejun (1); Wu, Xiaoyong (1)
Author affiliation: (1) State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing; 400044, China; (2) China Academy of Space Technology, Beijing; 100094, China
Corresponding author: Xie, Zhijiang(xie@cqu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 406-412
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to launch the lunar soil sampling test, a novel parallel mechanism of three degrees of freedom was designed and analyzed for the position and orientation adjustment. According to characteristics in movement of the mechanism, the freedom degree of mechanism was calculated by the modified K-G (Kutzbach-Grübler) formula after the analysis and calculation, the mechanism has a total of 3 degrees of freedom with 2 rotation and vertical movement, and the inverse solution of the kinematics problem was solved by adopting the closed vector method. The evaluation indexes of performance in velocity, acceleration and dexterity of the mechanism were established. A multi-objective genetic algorithm was proposed to optimize the structural parameters of the mechanism based on the performance of velocity and dexterity. The working space and singularity as well as performance in velocity and dexterity of the mechanism could be obtained after analyzing the optimized structural parameters. Results showed that the performance in velocity was excellent under the condition that α and β of the moving platform were moved in the range of -0.35~0.35 rad and the maximum value of the velocity performance index of the sampling test mechanism will appear in this range. The results also showed that the singularity would not appear when the performance indexes in dexterity were in the range of [4,5] and the mechanism had good movement performance and the operation velocity of the attitude of the moving platform in the characteristic direction and be satisfied. All the analysis results proved that the mechanism can meet the requirements of lunar soil sampling test and it had certain reference value for development of lunar soil sampling test. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Inverse problems
Controlled terms: Degrees of freedom (mechanics)? - ?Genetic algorithms? - ?Kinematics? - ?Mechanics? - ?Mechanisms? - ?Moon? - ?Soils? - ?Velocity
Uncontrolled terms: Movement performance? - ?Multi-objective genetic algorithm? - ?Parallel mechanisms? - ?Sampling test? - ?Vector method
Classification code: 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?601.3 Mechanisms
Mechanisms
? - ?657.2 Extraterrestrial Physics and Stellar Phenomena
Extraterrestrial Physics and Stellar Phenomena
? - ?931.1 Mechanics
Mechanics
DOI: 10.6041/j.issn.1000-1298.2016.08.053
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
28. Design and test of integrated device for ammonia nitrogen stripping and recovery of anaerobic-digested effluent
Accession number: 20163802820505
Authors: Wu, Shubiao (1); Xu, Xinjie (1); Sun, Hao (1); He, Keli (1); Wei, Xiaoming (2); Dong, Renjie (1)
Author affiliation: (1) Key Laboratory of Clean Utilization of Renewable Energy, Ministry of Agriculture, China Agricultural University, Beijing; 100083, China; (2) Beijing United Pioneer Environmental Engineering Co., Ltd., Beijing; 100007, China
Corresponding author: Dong, Renjie(rjdong@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 208-215
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: he treatment of anaerobic digestion effluent has become the bottleneck of large-scale biogas station application in China. In order to promote the engineering application of ammonia nitrogen stripping and recovery of anaerobic digestion, an integrated equipment for ammonia stripping and recovery with relative low cost was designed and constructed on-site to demonstrate its efficiency in real biogas plants, decrease lime dosage and control foam. This device mainly consisted of three functional units: pretreatment unit, pH value adjustment unit and ammonia stripping and recovery unit. To reduce the energy consumption, economical reflux circulated stripping method was adopted. A pilot test was carried out by using swine manure anaerobic-digested effluent at a biogas station of Beijing suburbs, the results showed that pH value of anaerobic digestion can be reached 10.5 by adding 22 g lime per liter after four months experiment and optimization, and ammonia removal rate reached 55.8% when the temperature and gas-liquid ratio were 30.7 and 960, respectively. Although adding dry lime powder was easily operated, the dissolved efficiency was relatively low. Pre-dissolved lime slurry can effectively avoid the defects and reduce the dosage by 7.5 g/L. Moreover, the effective calcium oxide content of lime from different producers had significant differences. And the performance of lime from different producers in increasing anaerobic digestion effluent pH value was compared and the lime dosage was also analyzed at different temperatures. Finally, higher ammonia removal rate could be attained by using this integrated device under ambient temperature and low air-liquid ratio (0~1 000). ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Anaerobic digestion
Controlled terms: Ammonia? - ?Biogas? - ?Cost engineering? - ?Effluent treatment? - ?Effluents? - ?Energy utilization? - ?Fertilizers? - ?Foam control? - ?Lime? - ?Nitrogen ? - ?pH? - ?Recovery
Uncontrolled terms: Ammonia stripping? - ?Anaerobic digested effluents? - ?Application in China? - ?Calcium oxide content? - ?Device design? - ?Engineering applications? - ?Integrated equipment? - ?Pilot tests
Classification code: 452.3 Industrial Wastes
Industrial Wastes
? - ?452.4 Industrial Wastes Treatment and Disposal
Industrial Wastes Treatment and Disposal
? - ?522 Gas Fuels
Gas Fuels
? - ?525.3 Energy Utilization
Energy Utilization
? - ?801.1 Chemistry, General
Chemistry, General
? - ?804 Chemical Products Generally
Chemical Products Generally
? - ?804.2 Inorganic Compounds
Inorganic Compounds
? - ?911 Cost and Value Engineering; Industrial Economics
Cost and Value Engineering; Industrial Economics
Numerical data indexing: Mass 2.20e-02kg, Mass_Density 7.50e+00kg/m3, Percentage 5.58e+01%
DOI: 10.6041/j.issn.1000-1298.2016.08.026
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
29. Seasonal variations of soil rill erodibility under different types of grass in loess hilly region
Accession number: 20163802820493
Authors: Wang, Changyan (1, 2); Yu, Yaochuang (1, 2)
Author affiliation: (1) College of Geography and Environment, Baoji Arts & Sci. University, Baoji; 721013, China; (2) Key Laboratory of Disaster Monitoring and Mechanism Simulating of Shaanxi Province, Baoji; 721013, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 101-108
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The seasonal variations of soil rill erodibility and their potential affecting factors were investigated by carrying out the experiment of water flumes with adjustable bed gradient and using the soil erosion process WEPP model, which was conducted in two tracts of rehabilitated grasslands in “Grain for Green” history during the grass growing season. One (Tract A) had been planted with Leymus secalimus for three years and the other (Tract B) with Medicago sativa L. for 17 years. Results showed that the soil rill erodibility of Tract A of grassland was increased at first and then declined and again increased during the whole growing season (p >0.05), while the soil rill erodibility of Tract B of grassland was declined at first and then became stable and again declined significantly during the whole growing season (p 2≥0.86,NSE≥0.85). The mean soil rill erodibility of Leymus secalimus and Medicago sativa L. during the whole growing season was much less than that of the control tract, which suggested that the practice of “Grain for Green” in hilly regions of the Loess Plateau of China was beneficial to soil and water conservation. The findings of this study may do duty for data support and theoretic basis in elaborating hydrodynamic mechanisms of the soil rill erodibility processes, evaluating effect of grass roots in fields of “Grain for Green” on soil and water conservation, and rationalizing arrangement of soil and water conservation practices and measures in hilly regions of the Loess Plateau of China. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 42
Main heading: Soil conservation
Controlled terms: Aggregates? - ?Erosion? - ?Landforms? - ?Plants (botany)? - ?Sediments? - ?Settlement of structures? - ?Soil mechanics? - ?Soil moisture? - ?Soils? - ?Transpiration ? - ?Water conservation
Uncontrolled terms: Loess hilly regions? - ?Rill erodibility? - ?Root growth? - ?Seasonal variation? - ?Soil consolidation
Classification code: 406 Highway Engineering
Highway Engineering
? - ?444 Water Resources
Water Resources
? - ?461.9 Biology
Biology
? - ?481.1 Geology
Geology
? - ?483 Soil Mechanics and Foundations
Soil Mechanics and Foundations
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
Numerical data indexing: Age 1.70e+01yr
DOI: 10.6041/j.issn.1000-1298.2016.08.014
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
30. Particle characteristics of eroded cinnamon soil from beijing based on simulated rainfall
Accession number: 20163802820497
Authors: Yang, Fan (1, 2); Zhang, Hongjiang (1, 2); Cheng, Jinhua (1, 2); Zhou, Zhudong (1, 2)
Author affiliation: (1) School of Soil and Water Conservation, Beijing Forestry University, Beijing; 100083, China; (2) Beijing Engineering Research Center of Soil and Water Conservation, Beijing Forestry University, Beijing; 100083, China
Corresponding author: Zhang, Hongjiang(zhanghj@bjfu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 137-145 and 215
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to study and illuminate the effects of different raindrops and runoff characteristics on size-selectivity of sediments crumb structure detachment and transportation in soil erosion process, a rainfall simulation study was conducted to examine the sediment particle dynamic distribution characteristics in Beijing, China. Erosion plots (5 m×1 m) were installed in a 20° hillslope. Experiment treatments included three rainfall intensities (35 mm/h, 65 mm/h and 100 mm/h) of representative rainfalls and three average vegetation coverages (0%, 30% and 80%). The changes of sediment crumb structure at erosion plots with and without raindrop impact were observed through placing the nylon net over the soil surface. The results showed that sediment concentration and soil loss were reduced by 25.91%~31.15% and 35.10%~41.20%, respectively, after eliminating raindrop impact. The sediment mean particle size (D50) of the slope without raindrops was less than that of the slope with raindrops, which was decreased by 23.47%, 27.17% and 31.63% under the three kinds of rainfall intensities. At the initial stage of runoff, coarse sand-size, fine sand-size, fine silt-size and clay-size existed in the form of aggregation, and coarse silt-size was in a state of primary particles. With the extension of rainfall, the E/U (effective-ultimate size) ratio of each graded size was gradually tended to be the value of 1, which indicated sediment particles existed in the form of primary particles. The correlation analysis of the sediment particle size and water flow power under different vegetation coverages showed that the slope erosion process was closely related to the hydrodynamic characteristics. The effect of splash on soil surface accounted for 28.09% of the total detachment degree before the runoff generation, and the soil aggregate fractal dimension increment with no raindrops on the slope was 48.43% of that with raindrops on the slope. In the sediment transport process, sand particles was decomposed into small particles, coarse silt particles were transported as primary particles, and clay particles was gradually enriched in the erosion process. The sediment size-selectivity characteristics by erosion dynamics in the process of erosion were revealed, which deepened the research on erosion regularity of different erosion processes. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Particle size analysis
Controlled terms: Aggregates? - ?Drops? - ?Erosion? - ?Flow of water? - ?Fractal dimension? - ?Particle size? - ?Rain? - ?Runoff? - ?Sediment transport? - ?Sedimentation ? - ?Sediments? - ?Silt? - ?Soils? - ?Vegetation
Uncontrolled terms: Aggregate structures? - ?Erosion process? - ?Hydrodynamic characteristics? - ?Particle characteristics? - ?Raindrops splashing? - ?Sediment concentration? - ?Sediment transport process? - ?Size selectivity
Classification code: 406 Highway Engineering
Highway Engineering
? - ?442.1 Flood Control
Flood Control
? - ?443.3 Precipitation
Precipitation
? - ?483 Soil Mechanics and Foundations
Soil Mechanics and Foundations
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?631.1.1 Liquid Dynamics
Liquid Dynamics
? - ?802.3 Chemical Operations
Chemical Operations
? - ?921 Mathematics
Mathematics
? - ?951 Materials Science
Materials Science
Numerical data indexing: Percentage 0.00e+00%, Percentage 2.35e+01%, Percentage 2.72e+01%, Percentage 2.81e+01%, Percentage 3.00e+01%, Percentage 3.16e+01%, Percentage 4.84e+01%, Percentage 8.00e+01%, Size 7.00e+00m
DOI: 10.6041/j.issn.1000-1298.2016.08.018
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
31. Suction performance and energy dissipation characteristics of annular submerged jets
Accession number: 20163802820482
Authors: Wang, Chao (1); Zhu, Jinbo (1); Hu, Biao (1)
Author affiliation: (1) College of Materials Science and Engineering, Anhui University of Science and Technology, Huainan; 232001, China
Corresponding author: Zhu, Jinbo(jinbo_zhu@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 14-21 and 13
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Under submerged condition, due to the external static pressure at nozzle exit, the cross section and inflow pressure of ejector pipe have significant impact on the suction performance and energy dissipation of annular jet device. In order to better adjust the annular jet nozzle, the methods of numerical simulation and experimental validation were adopted to analyze the impact of different cross section ratios and different inflow pressures on nozzle’s inspiration capacity and gas liquid ratio. From flow field, the energy dissipation and the intensity of vortex were explained for these effects. Results showed that both inspiration capacity and gas liquid ratio were increased in low cross section ratio, but in high cross section ratio inspiration capacity was decreased while gas liquid ratio was increased firstly and then decreased with the increase of inflow pressure, thus the ratio got the maximum value in this case. With the increase of cross section ratio, the inspiration capacity was increased while the gas liquid ratio was decreased. Different inflow pressures had good controllability for the gas liquid ratio with low cross section ratio, meanwhile, different cross section ratios had remarkable controllability for the gas liquid ratio at high inflow pressure. Under the same kinetic energy increment, the turbulent dissipation rate increment at different cross sections was considerably larger than the increment at different inflow pressures, thus the value of energy dissipation at different cross sections was large. All these features had relation to pressure difference between ejection fluid and water in the tank at different inflow pressures and sealing process of ejection fluid for nozzle at different sections. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Fighter aircraft
Controlled terms: Energy dissipation? - ?Fluids? - ?Gases? - ?Kinetic energy? - ?Kinetics? - ?Liquids? - ?Nozzles? - ?Numerical methods
Uncontrolled terms: Annular jets? - ?Energy dissipation characteristics? - ?Experimental validations? - ?Gas-liquid ratio? - ?Pressure differences? - ?Submerged condition? - ?Suction performance? - ?Turbulent dissipation rates
Classification code: 525.4 Energy Losses (industrial and residential)
Energy Losses (industrial and residential)
? - ?652.1.2 Military Aircraft
Military Aircraft
? - ?921.6 Numerical Methods
Numerical Methods
? - ?931 Classical Physics; Quantum Theory; Relativity
Classical Physics; Quantum Theory; Relativity
DOI: 10.6041/j.issn.1000-1298.2016.08.003
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
32. Temporal and spatial variation characteristics of rill erosion and hydrodynamic parameters on loessial hillslope
Accession number: 20163802820498
Authors: Qin, Chao (1); Wu, Hongyan (1); Zheng, Fenli (1, 2); Xu, Ximeng (1); Bian, Feng (3)
Author affiliation: (1) State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Institute of Soil and Water Conservation, Chinese Academy of Sciences, Ministry of Water Resources, Yangling; Shaanxi; 712100, China; (3) College of Natural Resources and Environment, Northwest A&F University, Yangling; Shaanxi; 712100, China
Corresponding author: Zheng, Fenli(flzh@ms.iswc.ac.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 146-154 and 207
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Rill erosion rate and hydrodynamic parameters present evident spatial and temporal variation characteristics during rill development process on hillslopes. Based on 3D laser scanning technique (LiDAR) and intermittent simulated rainfall experiments, high-precision DEMs were extracted. Temporal and spatial variations of rill erosion and hydrodynamic parameters at different rill development stages on loessial hillslope were analyzed. Results showed that the maximum values of rill erosion rate and hillslope erosion rate occurred at the rill deep cutting dominated stage, while the minimum values of them occurred at the rill headcut dominated stage. Rill erosion rates and hillslope erosion rates were increased at first and then tended to be steady and fluctuated in a certain range with rainfall duration. Hillslope erosion rates reached steady state earlier than rill erosion rates. Rill erosion rates and hillslope erosion rates under 90 mm/h rainfall intensity reached steady states earlier than those under 60 mm/h rainfall intensity. Rill erosion rates were first increased and then decreased along hillslope and showed parabola trend. The maximum values of rill erosion rate occurred at the hillslope lengths of 6 m and 7 m. Shear stress, stream power and unit stream power under 90 mm/h rainfall intensity were 1.3, 1.1 and 1.4 times as those under 60 mm/h rainfall intensity. Hydrodynamic parameters of overland flow and rill flow showed different variation trends with the increase of rainfall duration. Shear stress, stream power and unit stream power were increased with fluctuations of unit slope length under two rainfall intensities. It showed strong positive linear correlation between rill erosion per unit width and three hydrodynamic parameters. The critical values of shear stress, stream power and unit stream power reached the maximum values at initial phase of rill development. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 30
Main heading: Erosion
Controlled terms: Fluid dynamics? - ?Hydrodynamics? - ?Laser applications? - ?Rain? - ?Scanning? - ?Shear stress? - ?Surface analysis
Uncontrolled terms: 3D Laser scanning? - ?Hillslopes? - ?Hydrodynamic parameters? - ?Rill erosion? - ?Spatial and temporal variation
Classification code: 443.3 Precipitation
Precipitation
? - ?744.9 Laser Applications
Laser Applications
? - ?931.1 Mechanics
Mechanics
? - ?951 Materials Science
Materials Science
Numerical data indexing: Size 6.00e+00m, Size 7.00e+00m
DOI: 10.6041/j.issn.1000-1298.2016.08.019
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
33. A Review of Gully Erosion Process Research
Accession number: 20163802820487
Authors: Zheng, Fenli (1); Xu, Ximeng (1); Qin, Chao (1)
Author affiliation: (1) State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling; Shaanxi; 712100, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 48-59 and 116
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Gully erosion process researches in recent 60 years were reviewed from the following aspects: definition comparison of gully erosion at home and aboard, critical model for the initiation of gully erosion, influence factors of gully erosion process, prediction model of gully erosion, and gully erosion research methodology. Key research fields were also proposed, including standardization and normalization of gully erosion monitoring; quantification of head ward erosion, sidewall collapsing erosion, and deep cut erosion in gully erosion process; quantification of sediment transport capacity and establishment of sediment transportation continuity equation in ephemeral gully and gully erosion process; soil erosion prediction model at slope scale which included the ephemeral gully erosion, and soil erosion prediction model at watershed scale which covered the gully erosion; methodology research on gully erosion control. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 88
Main heading: Soil conservation
Controlled terms: Erosion? - ?Forecasting? - ?Landforms? - ?Sediment transport
Uncontrolled terms: Continuity equations? - ?Ephemeral gullies? - ?Ephemeral gully erosions? - ?Gully erosion? - ?Prediction model? - ?Research methodologies? - ?Sediment transport capacity? - ?Sediment transportation
Classification code: 481.1 Geology
Geology
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
Numerical data indexing: Age 6.00e+01yr
DOI: 10.6041/j.issn.1000-1298.2016.08.008
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
34. Ambient nitrogen fixation application of dielectric barrier discharge
Accession number: 20163802820488
Authors: Tang, Hongwei (1); Han, Yunfeng (1); Zhong, Chongshan (1)
Author affiliation: (1) College of Information and Electrical Engineering, China Agricultural University, Beijing; 100083, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 60-64 and 80
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: At room temperature, dielectric barrier discharge in air can produce non-thermal plasma with atmospheric pressure. Among the existed particles, there must be nitrogen and oxygen free radicals which combined as nitrogen oxides. The technology of non-thermal plasma nitrogen fixation was studied. Nitrogen oxides can be absorbed by water, and the nitrate solution can assist production of nitrogen fertilizer. In previous studies, The effects of time, voltage and frequency on nitrogen fixation were presented, and the subsequent discussion would be shown in this study. To eliminate error of absorption system, nitrogen oxide gas concentration was chosen as experiment detection index. Experimental factors included dielectric materials, dielectric thickness, discharge gap and peak to peak voltage. A four factors and three levels orthogonal experiment design method was used. Through range analysis of the experimental data, it showed that dielectric materials had the biggest effect on nitrogen oxide gas concentration. Through analyzing the average value of each factor, it showed that the optimal level for this experiment was quartz material, 5 mm medium thickness, 2 mm discharge gap and 30 kV peak to peak voltage. Under the optimal level and discharge for 5 min, gas concentration of nitrogen oxide was detected as 1 004.20 mg/m3and the efficiency of nitrogen fixation was 2.21 g/(kW·h). ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 19
Main heading: Nitrogen fixation
Controlled terms: Atmospheric pressure? - ?Dielectric devices? - ?Dielectric materials? - ?Electric discharges? - ?Flow control? - ?Free radicals? - ?Nitrogen? - ?Nitrogen fertilizers? - ?Nitrogen oxides? - ?Nitrogen plasma
Uncontrolled terms: Dielectric barrier? - ?Dielectric barrier discharges? - ?Dielectric thickness? - ?Experimental factors? - ?Nonthermal plasma? - ?Orthogonal experiment design? - ?Oxygen free radicals? - ?Peak-to-peak voltages
Classification code: 443.1 Atmospheric Properties
Atmospheric Properties
? - ?631.1 Fluid Flow, General
Fluid Flow, General
? - ?701.1 Electricity: Basic Concepts and Phenomena
Electricity: Basic Concepts and Phenomena
? - ?708.1 Dielectric Materials
Dielectric Materials
? - ?802.2 Chemical Reactions
Chemical Reactions
? - ?804 Chemical Products Generally
Chemical Products Generally
? - ?804.2 Inorganic Compounds
Inorganic Compounds
? - ?932.3 Plasma Physics
Plasma Physics
Numerical data indexing: Mass_Density 4.20e-06kg/m3, Size 2.00e-03m, Size 5.00e-03m, Time 3.00e+02s, Voltage 3.00e+04V
DOI: 10.6041/j.issn.1000-1298.2016.08.009
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
35. Numerical simulation of water and sediment flow in labyrinth channel based on coupled CFD-DEM
Accession number: 20163802820489
Authors: Yu, Liming (1, 2); Tan, Hong (1, 2); Zou, Xiaoyan (1, 2); Chang, Liuhong (1, 2); Chen, Lizhi (3); Fan, Wenbo (4)
Author affiliation: (1) School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha; 410114, China; (2) Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention, Changsha University of Science & Technology, Changsha; 410114, China; (3) College of Mechanical and Electrical Engineering, Central South University, Changsha; 410083, China; (4) College of Water & Architectural Engineering, Shihezi Univesity, Shihezi; 832003, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 65-71
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The depth of flow path of drip irrigation emitter is important geometrical parameter to anti-clogging performance. An Eulerian-Lagrange liquid-solid multiphase turbulence model combined with the kinetic theory of granular flow was used to carry out simulation based on coupled CFD-DEM water-sand two-phase flow in drip irrigation emitter with labyrinth channel. The trajectories and speed of single sediment, speed of sediment group, moving pattern and distribution of sediment group were analyzed. Simulation result indicated that the quantity of sand near the central plane of depth was more than that near the wall. The volume concentration of sediment in channel was increased several times with the decrease of depth. The depth was small; the speed of waterflow in depth direction was descended, but the speed of sediment in depth direction was risen. The average number of hit of each sediment was 14.31 when the depth was 0.6 mm, but the number was 2.04 when the depth was 1.4 mm. The increase of impact frequency to wall changed original movement direction of sediment, augmented the number of times of collision between sands and between sand on the wall, which decreased velocity and kinetic energy, and it was difficult for sand to go through labyrinth channel, which caused clogging easily. This method was applied to analyze movement and distribution of sand individuality and group, learn the movement regular from micro-view perspective, and it had become an efficient technique in structure design of labyrinth channel. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Two phase flow
Controlled terms: Computational fluid dynamics? - ?Computer simulation? - ?Couplings? - ?Geometry? - ?Granular materials? - ?Irrigation? - ?Kinetic energy? - ?Kinetics? - ?Numerical models? - ?Sand ? - ?Sediments? - ?Turbulence models
Uncontrolled terms: Drip irrigation? - ?Flow depth? - ?Impact frequency? - ?Kinetic theory of granular flow? - ?Labyrinth channels? - ?Multiphase turbulence? - ?Structure design? - ?Volume concentration
Classification code: 483 Soil Mechanics and Foundations
Soil Mechanics and Foundations
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?631.1 Fluid Flow, General
Fluid Flow, General
? - ?723.5 Computer Applications
Computer Applications
? - ?821.3 Agricultural Methods
Agricultural Methods
? - ?921 Mathematics
Mathematics
? - ?951 Materials Science
Materials Science
Numerical data indexing: Size 1.40e-03m, Size 6.00e-04m
DOI: 10.6041/j.issn.1000-1298.2016.08.010
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
36. Dynamic study on instant pressure drop puffing of granny smith apple slices using superheated vapor
Accession number: 20163802820508
Authors: An, Fengping (1); Guo, Rui (1); Song, Hongbo (1); Huang, Qun (1); Teng, Hui (1); Li, Tao (1)
Author affiliation: (1) College of Food Science, Fujian Agriculture and Forestry University, Fuzhou; 350002, China
Corresponding author: Song, Hongbo(sghgbode@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 227-232 and 324
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Unclear puffing power has always been an important problem for instant pressure drop puffing process using superheated vapor. And the condensation water produced by superheated vapor is absorbed by the food material before puffing, which possibly makes bad effect on puffing ratio.A general mathematical model of puffing power was established.Results indicated that puffing energy was produced by flash evaporation of superheated water from internal material and instant release of superheated vapor.Besides,porosity of sample varied with different sample moisture contents and condensation water generated in thermal transfer process before puffing.Thus,puffing ratio was related to the sample moisture content,porosity and status of superheated vapor.Using Granny Smith green apple slice as experimental objects,results suggested that porosity of sample was significantly decreased with the increase of sample moisture content.At temperature of 430~470 K,pressure of 0.1~0.5 MPa and apple moisture content of 15%~35%,the established puffing power model could effectively predict and evaluate the relationship between puffing condition and puffing ratio (R2>0.89).High vapor pressure had insignificant influence on condensation water,and distinctively elevated the energy of superheated water and superheated vapor,which resulted in the biggest puffing ratio.High temperature of superheated vapor can only strengthen superheated water energy,but significant increase of condensation water mass led to superheated vapor energy reduction,and it had slight effects on puffing energy improvement and puffing effect.Moreover,high moisture content of sample significantly increased superheated water energy,but condensation water reduced superheated vapor energy,which generally showed great effects on improvement of puffing power and puffing ratio.The research results illustrated the power mechanism of instant pressure drop puffing process using superheated vapor,which would be helpful to further study on the control of puffing ratio. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Driers (materials)
Controlled terms: Condensation? - ?Drops? - ?Fruits? - ?Models? - ?Moisture? - ?Moisture determination? - ?Porosity? - ?Pressure drop? - ?Thermal processing (foods)
Uncontrolled terms: Apple slices? - ?Condensation water? - ?Flash evaporation? - ?High moisture contents? - ?Puffing? - ?Superheated vapor? - ?Superheated water? - ?Thermal transfer
Classification code: 802.3 Chemical Operations
Chemical Operations
? - ?803 Chemical Agents and Basic Industrial Chemicals
Chemical Agents and Basic Industrial Chemicals
? - ?821.4 Agricultural Products
Agricultural Products
? - ?822.2 Food Processing Operations
Food Processing Operations
? - ?931.2 Physical Properties of Gases, Liquids and Solids
Physical Properties of Gases, Liquids and Solids
? - ?944.2 Moisture Measurements
Moisture Measurements
Numerical data indexing: Pressure 1.00e+05Pa to 5.00e+05Pa, Temperature 4.30e+02K to 4.70e+02K
DOI: 10.6041/j.issn.1000-1298.2016.08.029
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
37. Numerical simulation of erosion prediction in centrifugal pump based on particle track model
Accession number: 20163802820485
Authors: Huang, Xianbei (1); Yang, Shuo (1); Liu, Zhuqing (1); Yang, Wei (1); Li, Yaojun (1)
Author affiliation: (1) Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, China Agricultural University, Beijing; 100083, China
Corresponding author: Liu, Zhuqing(lzq@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 35-41
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Centrifugal pumps are widely used in the solid particles and liquid delivery, a number of areas petrochemical, aerospace, energy, irrigation and the like. When transporting sandy water, its internal wear becomes serious, which affects the life of unit. Therefore, the movement of particles in a centrifugal pump was investigated and the wear characteristics were predicted. Based on the two-phase particle track model and the Tabakoff and Grant erosion model, the simulation of a centrifugal pump was conducted to get the particle track and erosion regulation under different sands or inlet conditions. The result demonstrated that erosion was mostly taken place in hub and pressure side of vane in the impeller compared with shroud and suction side. The particle velocity to pressure side of the vane was increased with the raise of particle diameter, which would lead to dot impact erosion compared with large particles near the inlet side. While the strip scratch erosion was taken place at the press side of the impeller near the outlet when particle diameter was small. Moreover, the position and erosion shape were influenced by particle diameter in significant measure. While the erosion rate density was increased with the increase of concentration and the inlet velocity. Furthermore, the distribution of particle at the inlet also had effect on the erosion state, which meant that with the increase of uniformity of particle in the inlet, the erosion morphology turned into dispersed distribution from continuous sheet. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 16
Main heading: Erosion
Controlled terms: Centrifugal pumps? - ?Impellers? - ?Particle size? - ?Pumps? - ?Velocity control
Uncontrolled terms: Distribution of particles? - ?Erosion modeling? - ?Erosion morphology? - ?Erosion predictions? - ?Particle diameters? - ?Particle tracks? - ?Particle velocities? - ?Wear characteristics
Classification code: 601.2 Machine Components
Machine Components
? - ?618.2 Pumps
Pumps
? - ?731.3 Specific Variables Control
Specific Variables Control
DOI: 10.6041/j.issn.1000-1298.2016.08.006
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
38. Correlation between vegetable oil oxidation kinetics and triacylglycerol compositions based on thermogravimetry
Accession number: 20163802820510
Authors: Zhang, Qiaozhi (1); Ding, Jian (1); Tong, Wang (2); Jiang, Lianzhou (1); Sui, Xiaonan (1); Li, Yang (1)
Author affiliation: (1) College of Food Science, Northeast Agricultural University, Harbin; 150030, China; (2) Department of Food Science and Human Nutrition, Iowa State University, Ames; IA; 50011, United States
Corresponding author: Li, Yang(liyanghuangyu@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 241-247 and 254
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Thermogravimetry (TG) and derivative thermogravimetry (DTG) were used to investigate the thermal oxidative properties of six normal vegetable oils. The influence of different heating programs on the weight changing curves was studied and the onset oxidation temperature (Ton) and peak oxidation temperature (Tp) were located from the DTG curves. Through the application of Ozawa-Flynn-Wall iso-conventional method, the oxidation kinetic properties of oils were deduced and the correlation between thermal behaviors and triacylglycerol composition was analyzed. The results showed that both Tonand Tpwere increased with the raise of heating rate and Tpwas varied more sensitively, which indicated that the reactions occurred around Tpcould be more acuminous to the change in surroundings. Varying degrees of correlation were found between thermal behaviors and triacylglycerol distribution: Tonand Ea(Ton) were found to be positively correlated with high saturated triacylglycerols but negatively correlated with high unsaturated ones. Similar results were found between Tp, Ea(Tp) and various components but with weaker correlations. Specific correlation was depended on the type of fatty acid chains on glycerol skeletons. Thus, predictions of oil thermal stability could be done according to thetriacylglycerol profiles. Thermogravimetry analysis was praised for trace sample size, fast operation and high sensitivity, which would show promising prospect in oil processing and quality control. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 29
Main heading: Thermogravimetric analysis
Controlled terms: Correlation methods? - ?Fatty acids? - ?Glycerol? - ?Kinetics? - ?Oxidation? - ?Quality control? - ?Vegetable oils
Uncontrolled terms: Conventional methods? - ?Derivative thermogravimetry? - ?Fatty acid chains? - ?Oxidation kinetics? - ?Oxidation temperature? - ?Oxidative properties? - ?Thermogravimetry analysis? - ?Triacylglycerol compositions
Classification code: 801 Chemistry
Chemistry
? - ?802.2 Chemical Reactions
Chemical Reactions
? - ?804.1 Organic Compounds
Organic Compounds
? - ?913.3 Quality Assurance and Control
Quality Assurance and Control
? - ?922.2 Mathematical Statistics
Mathematical Statistics
? - ?931 Classical Physics; Quantum Theory; Relativity
Classical Physics; Quantum Theory; Relativity
DOI: 10.6041/j.issn.1000-1298.2016.08.031
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
39. Monitoring system for working performance of no-tillage corn precision seeder
Accession number: 20163802820480
Authors: Ji, Chao (1); Chen, Xuegeng (1); Chen, Jincheng (1); Wang, Shiguo (1); He, Pengliang (2)
Author affiliation: (1) Mechanical Equipment Research Institute, Xinjiang Academy of Agricultural and Reclamation Science, Shihezi; 832000, China; (2) College of Mechanical and Electrical Engineering, Shihezi University, Shihezi; 832000, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 1-6
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to monitor the seeding performance of no-tillage corn precision seeder in real time, a seeder monitoring system was developed based on photoelectricity induction of infrared reflection. For optical signal acquisition, a detector of monitoring system was designed with infrared emission diode and infrared photodiode as signal transmitting terminal and receiving end. Through evaluating and calculating the monitoring blind area, the structural and installation parameters of detector were optimized. To improve the dust-laden environmental adaptability of monitoring system, a self-cleaning device for dedusting using a rotary transparent dust cover was designed to protect the monitoring system from dust erosion. A hardware circuit of monitoring system with functions of seeding signal acquisition, working speed gathering, dedusting motor control and alarm display was developed. And a software algorithm with time difference of neighbor falling seeds as key parameter was studied to judge normal seeding, seed missing and reseeding. To test the precision of monitoring system, a bench experiment was conducted. The experimental results showed that the monitoring system had accuracies of 98.5% in seeding quantity, 95.1% in seed missing, 85.6% in reseeding, and had an accuracy of 98.1% in seeding quantity in the emulated environment of dust adhesion, which indicated that the monitoring system had high precision in monitoring the seeding performance, and achieved good effect for dedusting. This system can meet the requirement of working monitoring for no-tillage precision seeder, and it can help to improve sowing quality. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Monitoring
Controlled terms: Agricultural machinery? - ?Agriculture? - ?Dust? - ?Photoelectricity? - ?Signal analysis? - ?Signal processing
Uncontrolled terms: Corn? - ?Environmental adaptability? - ?Infrared reflections? - ?No-tillage seeders? - ?Photoelectric sensors? - ?Self cleaning? - ?Signal transmitting? - ?Working performance
Classification code: 451.1 Air Pollution Sources
Air Pollution Sources
? - ?701.1 Electricity: Basic Concepts and Phenomena
Electricity: Basic Concepts and Phenomena
? - ?716.1 Information Theory and Signal Processing
Information Theory and Signal Processing
? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
? - ?821.1 Agricultural Machinery and Equipment
Agricultural Machinery and Equipment
Numerical data indexing: Percentage 8.56e+01%, Percentage 9.51e+01%, Percentage 9.81e+01%, Percentage 9.85e+01%
DOI: 10.6041/j.issn.1000-1298.2016.08.001
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
40. Numerical analysis of effect of impacting velocity on diesel droplet impacting on inclined surface
Accession number: 20163802820521
Authors: Zheng, Zhiwei (1); Li, Dashu (2); Qiu, Xingqi (1); Zhu, Xiaoli (1); Ma, Peiyong (3); Zhang, Duo (4)
Author affiliation: (1) School of Chemical Engineering, China University of Petroleum, Qingdao; 266580, China; (2) CNOOC Research Institute, Beijing; 100028, China; (3) School of Mechanical and Automobile Engineering, Hefei University of Technology, Hefei; 230009, China; (4) Faculty of Engineering and Physical Sciences, University of Surrey, Guildford; GU2 7XH, United Kingdom
Corresponding author: Li, Dashu(lstax01@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 317-324
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to explore the process of liquid film formed by fuel droplet impact on the surface in small-size combustor of diesel engine, a numerical model was developed using coupled level set and volume of fluid method, including heat transfer and contact resistance, to explore the mechanism of a droplet impacting on inclined surface. The dynamic motion and mechanism of flow and breakup of droplet were obtained according to results analysis. The effect of impacting velocity on spreading factor, average wall heat flux, forward and backward spreading factors and spreading velocities were also explored. The results showed that the liquid jet was observed only at the front spreading edge during the oblique impact, which was different from the horizontal impact. The tangential forces for the oblique impact promoted the forward spreading and the formation of liquid jet at the front spreading edge. The breakup of liquid jet was observed at both neck and root areas. The pressure gradient inside the liquid jet was the main factor resulting in the formation, development and breakup of the liquid jet; capillary wave resulted in the breakup at the neck and root of liquid jet. The impacting characteristics were closely related to impacting velocity, the spreading factor, average wall heat flux, forward and backward spreading factors and spreading velocities obviously increased with the increase of impacting velocity; the effect of impacting velocity on impacting characteristics decreased as impacting velocity increase. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Liquids
Controlled terms: Diesel engines? - ?Drop breakup? - ?Drops? - ?Dynamics? - ?Fighter aircraft? - ?Heat flux? - ?Heat resistance? - ?Heat transfer? - ?Jets? - ?Liquid films ? - ?Numerical analysis? - ?Numerical methods? - ?Velocity
Uncontrolled terms: Droplet impact? - ?Dynamic motions? - ?Forward-and-backward? - ?Impacting characteristics? - ?Inclined surface? - ?Spreading factor? - ?Tangential force? - ?Volume of fluid method
Classification code: 612.2 Diesel Engines
Diesel Engines
? - ?631.1 Fluid Flow, General
Fluid Flow, General
? - ?641.2 Heat Transfer
Heat Transfer
? - ?652.1.2 Military Aircraft
Military Aircraft
? - ?921.6 Numerical Methods
Numerical Methods
? - ?931.2 Physical Properties of Gases, Liquids and Solids
Physical Properties of Gases, Liquids and Solids
DOI: 10.6041/j.issn.1000-1298.2016.08.042
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
41. Dynamic monitoring of cropping index in guanzhong area using remote sensing in 2000-2013
Accession number: 20163802820516
Authors: Shen, Jian (1); Chang, Qingrui (1, 2); Li, Fenling (1, 2); Qin, Zhanfei (1); Xie, Baoni (1)
Author affiliation: (1) Collage of Natural Resources and Environment, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Key Laboratory of Plant Nutrition and Agri-Environment in Northwest China, Ministry of Agriculture, Yangling; Shaanxi; 712100, China
Corresponding author: Chang, Qingrui(changqr@nwsuaf.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 280-287
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Multiple cropping is an efficient way to improve the crop yield for Guanzhong area of Chinese Loess Plateau. The spatiotemporal pattern change of multiple cropping in Guanzhong area from 2000 to 2013 was investigated. Cropping index was employed to quantitatively assess the multiple cropping. The twi-difference algorithm was applied to estimate the cropping index based on the crop NDVI time-series reconstructed from 250 m 16 d MODIS NDVI datasets with the iterative Savitzky-Golay method. Results were as follows: the cropping index was shown to be the highest in Xi’an City and it was decreased with the increase of distance from the city; the croplands with double seasons were mainly located in the Weihe River plain with an altitude of less than 600 m; the single-season croplands were primarily distributed over the loess ravine regions of the northern Guanzhong area, Qinling mountain area of the southern Guanzhong area and alluvial plain along the Yellow River (eastern Guanzhong area). The cropping index in 2000-2013 was found to reveal a two-stage downward trend. During 2000-2005, the cropping index was reduced very slowly and the rate of the decline was less than 2%; however, the decrease rate became high during 2006-2013 which reached 15.7% in 2013. The development of urbanization and economical agriculture were demonstrated to significantly influence the decline of cropping index. Through the comparison with the statistics issued by the government, the average relative error of cropping index estimated from MODIS datasets was between 0.3% and 15.1% at the regional level, and the result also had an accuracy of 93.7% at the pixel level. The presented results provided useful and reliable information for the decision making on spatially-targeted local agricultural planning. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 29
Main heading: Remote sensing
Controlled terms: Agriculture? - ?Crops? - ?Decision making? - ?Error statistics? - ?Iterative methods? - ?Radiometers? - ?Sediments? - ?Time series
Uncontrolled terms: Cropland? - ?Cropping index? - ?NDVI time series? - ?Phenology? - ?Savitzky-Golay
Classification code: 483 Soil Mechanics and Foundations
Soil Mechanics and Foundations
? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
? - ?821.4 Agricultural Products
Agricultural Products
? - ?912.2 Management
Management
? - ?921.6 Numerical Methods
Numerical Methods
? - ?922.2 Mathematical Statistics
Mathematical Statistics
? - ?944.7 Radiation Measuring Instruments
Radiation Measuring Instruments
Numerical data indexing: Percentage 1.57e+01%, Percentage 3.00e-01% to 1.51e+01%, Percentage 9.37e+01%
DOI: 10.6041/j.issn.1000-1298.2016.08.037
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
42. Type synthesis and structure optimization of parallel mechanism with position and orientation characteristics limb
Accession number: 20163802820529
Authors: Zhu, Wei (1); Shen, Huiping (1); Liu, Xiaofei (1); Dai, Zhiming (1); Zhu, Xiaorong (1)
Author affiliation: (1) School of Mechanical Engineering, Changzhou University, Changzhou; 213164, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 378-387 and 405
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The parallel mechanism with position and orientation characteristics limb (POL) is a kind of special low mobility mechanism which consists of 2~5 identical active unconstrained limbs and a passive POL. The motion characteristics of the mechanism are determined by POL, thus it was referred to as motion constraint generator by some literatures. This parallel mechanism with POL has many excellent characteristics, such as high rigidity, high control accuracy and bearing capacity, and the synthesis process is simpler than the other mechanism. Firstly, principle of composition of parallel mechanism with POL was proposed, and some formula of topological structure characteristics were simplified, including its position and orientation characteristics equation (POC), degree of freedom (DOF) and coupling degree, meanwhile, synthesis process of topological structure was listed. Secondly, topological structures of POL with 2~5 DOF and unconstrained active limbs were synthesized according to POC theory. Type synthesis of 4-DOF parallel mechanism was used as an example to illuminate the principles and methods of designing this kind of mechanism. In this section, the concept of generalized POL is mentioned, which contained not only traditional precisely constrained passive chains, but also some active branched chains. Thirdly, the mechanism was classified on the basis of the number of driving pairs in POL, and several cases were designed of each type. Lastly, two ways of structure optimization for chain structure and mechanism symmetric were presented to improve mechanical properties of partial examples. The research provided a more systemic theory and design methodology for topological structure synthesis of the parallel mechanism with POL than previous literatures. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Mechanisms
Controlled terms: Chains? - ?Degrees of freedom (mechanics)? - ?Structural optimization? - ?Topology
Uncontrolled terms: Degree of freedom (dof)? - ?Motion characteristics? - ?Motion constraints? - ?Parallel mechanisms? - ?Position and orientations? - ?Structure optimization? - ?Theory and designs? - ?Topological structure
Classification code: 601.3 Mechanisms
Mechanisms
? - ?602.1 Mechanical Drives
Mechanical Drives
? - ?921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory
Combinatorial Mathematics, Includes Graph Theory, Set Theory
? - ?921.5 Optimization Techniques
Optimization Techniques
? - ?931.1 Mechanics
Mechanics
DOI: 10.6041/j.issn.1000-1298.2016.08.050
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
43. Numerical simulation analysis of internal flow in S-shaped outlet conduit
Accession number: 20163802820484
Authors: Xie, Rongsheng (1); Tang, Fangping (1); Liu, Chao (1); Shi, Lijian (1); Yang, Fan (1); Zhang, Song (2)
Author affiliation: (1) School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou; 225009, China; (2) Yangzhou Survey Design Research Institute Co., Ltd., Yangzhou; 225009, China
Corresponding author: Tang, Fangping(tangfp@yzu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 29-34 and 41
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to research the hydraulic performance of the post position S-shaped shaft outlet conduit under the influence of circulation, the hydraulic performance of the post position S-shaped shaft pumping station under different blade models and different blade angles was simulated with commercial CFD software, and the experiment results were compared with the CFD results. The analysis of hydraulic performance of S-shaped outlet conduct showed that the inner flow field was strongly affected by the residual circulation of guide vane, the coefficient of hydraulic loss was no longer a constant, but a variable which was related to flow field. By comparing the relationship of the average swirl angle in the inlet and the hydraulic loss coefficient of the outlet conduit, it was found that an optimal average swirl angle existed for hydraulic loss coefficient. And the optimal average swirl angle was about 4°~5.3° for two different blades models, and the hydraulic loss coefficient was 1.62×10-4m·s2/L2. By analyzing the static pressure and total pressure distribution curve, the conclusion below can be drawn: the mainly reason for the hydraulic loss was average swirl angle value at the small discharge, on the contrary the reason for the large hydraulic loss was velocity at large discharge. After the water flowing through the second corner, most of the kinetic energy is recovered. The research result gave a good suggestion for the design and optimization of pump station. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 19
Main heading: Computational fluid dynamics
Controlled terms: Computer simulation? - ?Flow fields? - ?Kinetic energy? - ?Kinetics? - ?Numerical models? - ?Pumps
Uncontrolled terms: Design and optimization? - ?Hydraulic loss? - ?Hydraulic performance? - ?Numerical simulation analysis? - ?Outlet conduits? - ?Pumping stations? - ?Residual circulations? - ?Swirl angles
Classification code: 618.2 Pumps
Pumps
? - ?631.1 Fluid Flow, General
Fluid Flow, General
? - ?723.5 Computer Applications
Computer Applications
? - ?921 Mathematics
Mathematics
DOI: 10.6041/j.issn.1000-1298.2016.08.005
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
44. Simulation analysis of effect of planting summer catch crop sweet corn on nitrate leaching for greenhouse vegetable field in suburbs of Beijing
Accession number: 20163802820496
Authors: Liang, Hao (1); Hu, Kelin (2); Hou, Sen (2); Zou, Guoyuan (3); Wang, Lei (1)
Author affiliation: (1) Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture, Beijing; 100081, China; (2) College of Resources and Environmental Sciences, China Agricultural University, Beijing; 100193, China; (3) Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing; 100097, China
Corresponding author: Hu, Kelin(hukel@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 125-136
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to reduce the effect of intensive rainfall on nitrate leaching in summer for greenhouse vegetable field in North Plain China, a three-year (2008-2010) field experiment was conducted in the suburbs of Beijing during the period of intensive rainfall season from July to September. Five different treatments were designed, including three nitrogen fertilizer levels (CK, no nitrogen fertilizer; N1, 380 kg/hm2and N2, 260 kg/hm2of nitrogen) in previously grown crop, and two other treatments with and without sweet corn as a catch crop based on the treatments of N1 and N2, denoted by N1C and N2C, respectively. The three-year field observed data was used to calibrate and validate the WHCNS (soil water heat carbon nitrogen simulator) model, and subsequently nitrate leaching, and water and nitrogen balance of different treatments were simulated. The results showed that evaporation and drainage were two main pathways of water consumption for the fallow treatments, while the main pathway of catch crop treatments was evapotranspiration and drainage. The amount of water drainage was in the order of CK>N1≈N2>N1C>N2C. Planting sweet corn can reduce nearly 42% of water drainage compared with without catch crop treatments. The water balance for fallow treatments was positive, and it was negative for the catch crop treatments, which indicated that the sweet corn consumed soil water stored in soil profile. The order of nitrate leaching rate of different treatments was N1>N2>CK>N1C>N2C, and the mass of nitrate leaching for catch crop treatments ranged from 1.3 kg/hm2to 50.9 kg/hm2, which was much lower compared with those of N1 and N2 treatments (59.2~273.6 kg/hm2), and even lower than that of the CK treatment (38.6~151.6 kg/hm2). The catch crop reduced 80% and 85% of nitrate leaching compared with treatments of N1 and N2, respectively. It can be concluded that using the deep-rooted sweet corn as a catch crop in summer can delay and control the nitrate leaching. Therefore, it can be used as an efficient method to reduce the risk of nitrate leaching for greenhouse vegetable field in the North China Plain. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 27
Main heading: Crops
Controlled terms: Carbon? - ?Evapotranspiration? - ?Fertilizers? - ?Greenhouse effect? - ?Greenhouses? - ?Leaching? - ?Nitrates? - ?Nitrogen? - ?Nitrogen fertilizers? - ?Rain ? - ?Soil moisture? - ?Soils? - ?Vegetables? - ?Water supply
Uncontrolled terms: Catch crops? - ?Corn? - ?Greenhouse vegetables? - ?Nitrate leaching? - ?Nitrogen models? - ?Water drainage
Classification code: 443.3 Precipitation
Precipitation
? - ?446.1 Water Supply Systems
Water Supply Systems
? - ?451 Air Pollution
Air Pollution
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?802.3 Chemical Operations
Chemical Operations
? - ?804 Chemical Products Generally
Chemical Products Generally
? - ?804.2 Inorganic Compounds
Inorganic Compounds
? - ?821.4 Agricultural Products
Agricultural Products
? - ?821.6 Farm Buildings and Other Structures
Farm Buildings and Other Structures
Numerical data indexing: Percentage 4.20e+01%, Percentage 8.00e+01%, Percentage 8.50e+01%
DOI: 10.6041/j.issn.1000-1298.2016.08.017
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
45. Influence factors and characteristics of transpiration and evaporation in water-saving irrigation paddy field under different temporal scales
Accession number: 20163802820492
Authors: Liu, Xiaoyin (1, 2); Wang, Guanyi (2); Yang, Shihong (1, 2); Xu, Junzeng (1, 2); Wang, Yijiang (3)
Author affiliation: (1) State Key Laboratory of Hydrology-water Resources and Hydraulic Engineering, Hohai University, Nanjing; 210098, China; (2) College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing; 210098, China; (3) Kunshan Water Conservancy Engineering Quality and Safety Supervision and Water Technology Popularization Station, Kunshan; 215300, China
Corresponding author: Yang, Shihong(ysh7731@hhu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 91-100 and 170
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Rice evapotranspiration and soil evaporation were measured by using canopy mini-lysimeter system in rice growth period in 2015 with water saving irrigation in the South China Plain. The characteristics of diurnal variation in typical days and daily variation during the whole growth period for evapotranspiration (ET), transpiration (T) and evaporation (E) were analyzed. The ratio of E to ET was also discussed. In addition, the correlations between T, as well as E, and related factors at hourly and daily scales were studied based on multiple linear regression method. The results illustrated that the diurnal variations of ET and T were basically consistent, which presented as the singlet trend of inverted “U” shape obviously. At the stage of tillering, E was also varied diurnally in unimodel shape, while there was no obviously diurnal variation after tillering stage. Positive and negative fluctuations of ET at night indicated that the influence of water vapor condensation on measurement of mini-lysimeter cannot be ignored. The daily variation trend of T was also similar to ET, and the two values were increased firstly and then decreased, with peak value occurred at late tillering stage. Moreover, rice evapotranspiration was soil evaporation primarily before late tillering stage, and later transpiration was dominant. The ratio of E to ET was varied from 1 to 0.19 with the growth of rice, and it was increased slightly in the ripening stage with value of 0.23. The main factors that affected transpiration and evaporation of water saving irrigation paddy fields were not identical at hourly and daily temporal scales. Net radiation (Rn) and leaf area index (LAI) were the main influence factors for rice transpiration at hourly and daily scales, respectively, while LAI and vapor pressure difference (D) were the main influence factors for soil evaporation at the two scales, respectively. LAI had significant effect on transpiration and evaporation at both temporal scales (α<0.001), albeit in varying degrees. The analysis of scale difference had important and practical significance to the research of water management and water transformation in the field. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 46
Main heading: Transpiration
Controlled terms: Evaporation? - ?Evapotranspiration? - ?Irrigation? - ?Linear regression? - ?Lysimeters? - ?Regression analysis? - ?Soil surveys? - ?Soils? - ?Water conservation? - ?Water management
Uncontrolled terms: Influence of water? - ?Multiple linear regression method? - ?Paddy fields? - ?Soil evaporations? - ?Temporal scale? - ?Vapor pressure differences? - ?Water transformations? - ?Water-saving irrigation
Classification code: 444 Water Resources
Water Resources
? - ?461.9 Biology
Biology
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?802.3 Chemical Operations
Chemical Operations
? - ?821.3 Agricultural Methods
Agricultural Methods
? - ?922.2 Mathematical Statistics
Mathematical Statistics
? - ?943.3 Special Purpose Instruments
Special Purpose Instruments
DOI: 10.6041/j.issn.1000-1298.2016.08.013
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
46. Effect of soil water content at different growth stages on vitamin C content in tomato fruit
Accession number: 20163802820490
Authors: Liu, Jie (1, 2); Chen, Si (1, 2); Zhou, Zhenjiang (1, 2); Hu, Tiantian (1, 2)
Author affiliation: (1) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling; Shaanxi; 712100, China
Corresponding author: Hu, Tiantian(hutiant@nwsuaf.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 72-80
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Pot experiment was conducted to determine the response of vitamin C (VC) content in tomato fruit to soil water condition at different growth stages. Growth stages were divided by the law of tomato development and the growth of the first cluster fruits, including seeding, flowering, fruit early growing, inflation and quality formation stages. Five levels of soil water condition were set at each stage, and quadratic general composite rotatable method with five factors was used. Mathematical model between VC content and soil water content of different stages was established. The main effect, single effect and coupling effect of two factors were analyzed, and model optimization was operated in DPS 3.0. Results showed that the influence of soil water content at quality formation stage on VC content was top-drawer, seeding stage was ranked the second and flowering stage was taken the least. When other stages’ soil water content was (70%~80%)θf, with the increase of soil water content at seeding or flowering stages, VC content in tomato fruit was varied slightly (variable coefficients were 2.46% and 3.08%, respectively), while a downwards parabola change was found when soil water content was risen at other three stages. Additionally, the peaks of parabola were 24.10 mg/(100 g), 24.21 mg/(100 g) and 24.10 mg/(100 g) when soil water contents were (67.79%~77.79%)θf, (65.58%~75.58%)θfand (68.86%~78.86%)θf, respectively. There were significant coupling effects of two factors on tomato VC content, both positive and negative. VC content might reach the highest level of 30.10 mg/(100 g) when soil water content at five different stages were (50%~60%)θf, (90%~100%)θf, (50%~60%)θf, (80%~90%)θfand (70%~80%)θf, respectively, while yield was decreased sharply. Tomato yield and VC content in fruit acquired desirable level, which were 996.75~1 037.99 g/plant and 25.40~26.02 mg/(100 g) when soil water contents at five stages were (90%~99.9%)θf, (90%~99.8%)θf, (90%~99.6%)θf, (74.0%~81.8%)θfand (74.3%~82.5%)θf, respectively. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Fruits
Controlled terms: Soil moisture? - ?Soils? - ?Water content
Uncontrolled terms: Composite rotatable design? - ?Growth stages? - ?Soil water content? - ?Tomato? - ?Vitamin C
Classification code: 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?821.4 Agricultural Products
Agricultural Products
Numerical data indexing: Mass 1.00e-01kg, Percentage 2.46e+00%, Percentage 3.08e+00%
DOI: 10.6041/j.issn.1000-1298.2016.08.011
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
47. Assessing method for feeding activity of swimming fishes in RAS
Accession number: 20163802820517
Authors: Zhao, Jian (1); Zhu, Songming (1); Ye, Zhangying (1); Liu, Ying (2); Li, Yong (3); Lu, Huanda (4)
Author affiliation: (1) College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou; 310058, China; (2) School of Marine Science and Technology and Environment, Dalian Ocean University, Dalian; 116034, China; (3) Institute of Oceanology, Chinese Academy of Sciences, Qingdao; 266071, China; (4) Ningbo Institute of Technology, Zhejiang University, Ningbo; 315100, China
Corresponding author: Ye, Zhangying(yzyzju@zju.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 288-293
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The problem of effective feeding for swimming fishes in recirculating aquaculture system (RAS) was studied. In order to solve this problem, a novel assessing method for the feeding activity of shoal was proposed with the help of tilapia which was used as the experimental objective, and the proposed method was based on the improved kinetic energy model. Instead of the complex segmentation of foreground of shoal and the tracking of individuals among shoals, the change characteristics of reflective areas of water surface caused by feeding activity of shoal were regarded directly as the key factor in this method. Firstly, the reflective areas of water surface were segmented and extracted in HSV-based color space. Then, with the help of the Lucas-Kanade optical flow, statistics method and entropy, the disorder degree of the change in reflective areas was calculated and analyzed. Finally, combined with information of the changing magnitude of reflection areas, the intensity assessment of feeding activity of shoal was executed. According to the comparison and analysis of the experimental results, the proposed method showed good description in intensity of feeding activity of shoal with different digesta index of stomach and bowels (20.35±10, 150.61±10) under strategy of over-satiation feeding through intermittent feeding at intervals of (40±2) s. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Feeding
Controlled terms: Aquaculture? - ?Fish? - ?Kinetic energy? - ?Kinetics? - ?Optical flows
Uncontrolled terms: Assessing method? - ?Comparison and analysis? - ?Disorder degree? - ?Feeding activities? - ?Lucas-kanade? - ?Recirculating aquaculture system? - ?Statistics method? - ?Water surface
Classification code: 691.2 Materials Handling Methods
Materials Handling Methods
? - ?741.1 Light/Optics
Light/Optics
? - ?821.3 Agricultural Methods
Agricultural Methods
? - ?931 Classical Physics; Quantum Theory; Relativity
Classical Physics; Quantum Theory; Relativity
DOI: 10.6041/j.issn.1000-1298.2016.08.038
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
48. Influences of biochar on physical properties of meadow black soil and dynamic changes of soil water after individual rainfall
Accession number: 20163802820504
Authors: Wei, Yongxia (1, 2); Liu, Zhikai (1); Feng, Dingrui (1); Sun, Jipeng (1); Zhang, Yufeng (1)
Author affiliation: (1) College of Water Conservancy and Architecture, Northeast Agricultural University, Harbin; 150030, China; (2) Key Laboratory of High Efficiency Utilization of Agricultural Water Resources, Ministry of Agriculture, Harbin; 150030, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 201-207
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The effects of biochar which was made of crop straw on physical properties of meadow black soil and dynamic changes of soil water after individual rainfall were studied. The experiments were conducted by field pilots which were located at the sloping farm-land with three degrees of land slope gradient of Hongxing State Farm, Heilongjiang Province in 2015, and soybean, the main crop type of study area, was selected as experimental crop. Five levels of biochar were set, as 0 t/hm2, 25 t/hm2, 50 t/hm2, 75 t/hm2and 100 t/hm2of biochar were put in the field pilots, which were represented by CK, C1, C2, C3 and C4, respectively. During the whole growth period of soybean, the soil physicochemical properties were investigated, including soil water characteristic curve, soil water diffusivity, soil bulk density, rate of soil porosity, organic matter content of soil, saturated soil water content, field water capacity and characteristics of soil water after individual rainfall. Soil water characteristic curve was measured by centrifuge, soil water diffusivity was tested by horizontal vitreous soil column, and soil water contents were measured by TDR field soil water measurement system in situ. The results showed that biochar could remarkably reduce soil bulk density and decrease soil water diffusivity of meadow black soil in the black soil area. The residual soil water content could be declined by 27.6% by treatment of C4. With the increase of biochar quantitative level, soil water diffusivities of C1, C2, C3 and C4 were decreased by 34.8%, 37.5%, 71.4% and 58.9%, respectively. Additionally, it could give a rise to the saturated soil water content, field capacity and soybean yield, and the treatment with 75 t/hm2biochar got the highest yield. During an individual rainfall, with the use of biochar, the variation amplitude of soil water content tended to fall. This helped to accelerate the process of soil water content changing from rapid declining stage to slow declining stage, meanwhile, it increased the soil water content in the slow declining stage obviously. The research results can provide theoretical foundation for efficient utilization and protection of soil and water resources in agriculture in the black soil region. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Soils
Controlled terms: Crops? - ?Diffusion? - ?Diffusion in liquids? - ?Dynamics? - ?Physical properties? - ?Plants (botany)? - ?Porosity? - ?Rain? - ?Soil moisture? - ?Water content ? - ?Water resources
Uncontrolled terms: Bio chars? - ?Black soil? - ?Soil physical property? - ?Soil water content? - ?Soil-water characteristic curve? - ?Water diffusivity
Classification code: 443.3 Precipitation
Precipitation
? - ?444 Water Resources
Water Resources
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?821.4 Agricultural Products
Agricultural Products
? - ?931.2 Physical Properties of Gases, Liquids and Solids
Physical Properties of Gases, Liquids and Solids
Numerical data indexing: Percentage 2.76e+01%, Percentage 3.48e+01%, Percentage 3.75e+01%, Percentage 5.89e+01%, Percentage 7.14e+01%
DOI: 10.6041/j.issn.1000-1298.2016.08.025
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
49. Equipment for biomass continuous grading pyrolysis
Accession number: 20163802820507
Authors: Zhao, Lixin (1); Jia, Jixiu (1, 2); Yao, Zonglu (1); Cong, Hongbin (1); Wang, Jinxing (2); Zhang, Xiaohui (2)
Author affiliation: (1) Key Laboratory of Energy Resource Utilization from Agriculture Residue, Ministry of Agriculture, Chinese Academy of Agricultural Engineering, Beijing; 100125, China; (2) College of Mechanical and Electronic Engineering, Shandong Agricultural University, Taian; 271018, China
Corresponding author: Yao, Zonglu(yaozonglu@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 221-226 and 220
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The five pyrolyzing furnaces which adopted grading heating technology was developed to solve the problem of bad control of temperature in the process of biomass pyrolysis. Combining with continuous conveying principle, circulating water cooling technology, secondary cracking technology of pyrolysis gas, secondary condensing collection of bio-oil and biogas, the equipment for biomass continuous grading pyrolysis was developed. Each furnace was heated by a 3 kW electric wire with PID control allowing a wide range of heating rates and a maximum temperature of 700. Pyrolysis test which used the crushing corn straw was completed after the pellet equipment was made, results showed that the equipment worked well and the feed throughput can be up to 12 kg/h, the yield of carbon was 29.97%, the low calorific value was 26.21 MJ/kg, the yield of fix-carbon was 55.63% and the temperature of collected carbon was 24 when the temperature of furnace was set at 550, 600, 600, 600 and 550, respectively, after separation of pyrolysis gas and bio-oil, the pyrolysis gas flow into an afterburner chamber where enough air fuelled ensured complete combustion, which conformed to the demand of grading heating and continuous pyrolysis. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Pyrolysis
Controlled terms: Biofuels? - ?Biomass? - ?Cracking (chemical)? - ?Equipment? - ?Flow of gases? - ?Furnaces? - ?Grading? - ?Heating? - ?Oil well testing? - ?Three term control systems
Uncontrolled terms: Biomass pyrolysis? - ?Circulating waters? - ?Continuous pyrolysis? - ?Heating technology? - ?Maximum temperature? - ?Pyrolysis experiments? - ?Pyrolysis gas flows? - ?Secondary cracking
Classification code: 511.1 Oil Field Production Operations
Oil Field Production Operations
? - ?631.1.2 Gas Dynamics
Gas Dynamics
? - ?731.1 Control Systems
Control Systems
? - ?802.2 Chemical Reactions
Chemical Reactions
? - ?901 Engineering Profession
Engineering Profession
Numerical data indexing: Mass_Flow_Rate 3.33e-03kg/s, Percentage 3.00e+01%, Percentage 5.56e+01%, Power 3.00e+03W, Specific_Energy 2.62e+07J/kg
DOI: 10.6041/j.issn.1000-1298.2016.08.028
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
50. Application effect of greenhouse root zone thermal environment control system with latent functionally thermal fluid
Accession number: 20163802820518
Authors: Wang, Yuxin (1); Liu, Shuang (1); Wang, Pingzhi (1); Shi, Guangying (1)
Author affiliation: (1) College of Water Resources and Civil Engineering, China Agricultural University, Beijing; 100083, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 294-304
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to explore an energy-efficient thermal environment control model in greenhouse, the application of thermal environment phase change control system was studied in solar greenhouse. A solar greenhouse root zone thermal environment control system was designed and built, including the phase change thermal unit, latent heat storage and exchange unit, root temperature control unit, circulation pump group and circulation pipeline. The latent functionally thermal fluid was used as liquid heat transferring medium in the heat collection, delivery and release of solar radiation. The system included three different work modes, and the thermal performance testing project was formulated. In winter of 2014, the operation performance of the designed system and application effect on lettuce seedlings were tested through controlled experiment of three different operation conditions, using two greenhouse models with the same construction and root zone thermal environment control system. The results indicated that the designed system significantly reduced the indoor air and shallow substrate temperature fluctuations in experimental greenhouse model, and significantly lowered the everyday highest indoor temperature and obviously increased root zone temperature of root zone substrates in winter, thus improving balance of temperature distribution among substrate layers with different depths. During the whole winner test process, the everyday highest indoor air temperature and the average fluctuation range of air temperature were averagely decreased by 7.2% and 5.1%, respectively, and the average 20 cm depth root zone temperature and the average fluctuation range were increased by 15.1% and 39.0%, respectively. Among the three operation stages, system performances of the stage with flow rate of 3~4 L/min was the optimum one, with the most obvious increases of average temperature and average fluctuation range of 20 cm deep substrate, as well as the most significant rise in reduction percentages of temperature differences between 5 cm deep and 20 cm deep substrates. In addition, the plant height, stem diameter, leaf area per plant and width of maximum leaf of lettuce seedlings in the model were increased by 13.4%, 11.9%, 79.1% and 35.3%, respectively. Overall, the effect of the system was remarkable in sunny days. In conclusion, the phase change heat collecting system can effectively control the air the root zone thermal environment in greenhouse and promote seedling growth of vegetables. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Greenhouse effect
Controlled terms: Atmospheric temperature? - ?Control systems? - ?Energy efficiency? - ?Greenhouses? - ?Heat storage? - ?Seed? - ?Solar heating? - ?Substrates? - ?Temperature distribution? - ?Testing
Uncontrolled terms: Phase Change? - ?Regulatory systems? - ?Root zone? - ?Solar greenhouse? - ?Thermal environment
Classification code: 443.1 Atmospheric Properties
Atmospheric Properties
? - ?525.2 Energy Conservation
Energy Conservation
? - ?641.1 Thermodynamics
Thermodynamics
? - ?657.1 Solar Energy and Phenomena
Solar Energy and Phenomena
? - ?731.1 Control Systems
Control Systems
? - ?821.4 Agricultural Products
Agricultural Products
? - ?821.6 Farm Buildings and Other Structures
Farm Buildings and Other Structures
Numerical data indexing: Percentage 1.19e+01%, Percentage 1.34e+01%, Percentage 1.51e+01%, Percentage 3.53e+01%, Percentage 3.90e+01%, Percentage 5.10e+00%, Percentage 7.20e+00%, Percentage 7.91e+01%, Size 2.00e-01m, Size 5.00e-02m
DOI: 10.6041/j.issn.1000-1298.2016.08.039
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
51. Isolation of lactic acid bacteria from musalais and effects of mixed-culture on saccharomyces cerevisiae ethanol fermentation
Accession number: 20163802820512
Authors: Ren, Xiaopu (1, 2); Li, Mingyang (1, 2); Chen, Shenghuizi (1, 2); Niu, Xiyue (1, 2); Xu, Qian (1, 2)
Author affiliation: (1) College of Life Science, Tarim University, Alar; 843300, China; (2) Production & Construction Group Key Laboratory of Special Agricultural Products Further Processing in Southern Xinjiang, Tarim University, Alar; 843300, China
Corresponding author: Xu, Qian(xuqiantaru@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 255-259
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Musalais is a very traditional Uygur ethnic characteristic drink and the co-existence of Saccharomyces cerevisiae and lactic acid bacteria (LAB) is widely presented in the natural fermentation process. Five LAB mediums were used for isolating from two Musalais samples and semi-quantitative assay was performed to examine the biofilm formation of the LAB strains. The positive-biofilm LAB was performed to mixed-cultivate with five Saccharomyces cerevisiae from Musalais. The effects of co-cultured with Saccharomyces cerevisiae on LAB growth and biofilm formation were explored and the effects of five Saccharomyces cerevisiae by the mixed biofilm formation on the ethanol fermentation were detected under the simulation conditions of Musalais natural fermentation. The results showed that 21 suspected LAB strains were isolated from two Musalais samples and two strains were detected as strongly positive biofilm formation (OD490nm>0.56). The further identification results showed that the two strains were Lactobacillus plantarum (T1-8) and Pediococcus pentosaceus (M1-6), respectively. After co-culturing, the Saccharomyces cerevisiae A had a very significant effect on the biofilm formation of the L.plantarum (T1-8) (p<0.01) and the Saccharomyces cerevisiae B and D had significant effects on the biofilm formation of the L.plantarum (T1-8) (p<0.05). However, all the Saccharomyces cerevisiae had no obvious effects on growth and biofilm formation of P.pentosaceus (M1-6). The ethanol yields of the corresponding Saccharomyces cerevisiae were improved nearly twice as much or more in the groups of A+T1-8, B+T1-8, C+T1-8, D+T1-8, B+M1-6, C+M1-6 and D+M1-6. The other groups also had different degrees of increase. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 17
Main heading: Yeast
Controlled terms: Bacteria? - ?Biofilms? - ?Ethanol? - ?Fermentation? - ?Laboratories? - ?Lactic acid
Uncontrolled terms: Biofolm? - ?Ethanol fermentation? - ?Fermentation process? - ?Lactic acid bacteria? - ?Lactobacillus plantarum? - ?Musalais? - ?Pediococcus pentosaceus? - ?Quantitative assay
Classification code: 462.5 Biomaterials (including synthetics)
Biomaterials (including synthetics)
? - ?804.1 Organic Compounds
Organic Compounds
? - ?822.3 Food Products
Food Products
DOI: 10.6041/j.issn.1000-1298.2016.08.033
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
52. Prediction of cloud cavitation shedding in tip region of axial flow pump based on DCMFBM turbulence model
Accession number: 20163802820483
Authors: Zhang, Desheng (1); Shi, Lei (1); Chen, Jian (1); Geng, Linlin (1); Liu, Junlong (1)
Author affiliation: (1) Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang; 212013, China
Corresponding author: Zhang, Desheng(zds@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 22-28
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A type of cavitation pattern named triangle cloud cavitation structure, which was formed by tip clearance cavitation, shear layer cavitation and tip leakage vortex cavitation, would cause some adverse effects on its shedding cavity at the trailing edge, such as diminished overall performance and efficiency, rotating instabilities, noise and vibration. Thus the mechanism of the phenomenon should be understood. For the sake of deeply studying the process of cloud cavitation shedding in the tip region of an axial-flow model pump, the filter-based model with modified density of RNG k-Ε turbulence model was embedded into the commercial software ANSYS CFX by the secondary development technology for simulation. Simultaneously, the homogenous cavitation model was also adopted to simulate the unsteady cavitating turbulent flows. Some significant results were summarized. The simulation results were compared with experimental values. It could be concluded that the simulation results were agreed well with experimental values by successfully predicting the periodic process of cloud cavitation shedding in the tip region with DCMFBM turbulence model. With the rotation of blade, the shedding cavity was migrated towards the pressure side of neighboring blade and affected the load distribution of the pressure side; meanwhile, it also had impact on its load distribution on the suction side. A radial jet from the hub to the rim was found near the exit of blade, when it reached the blade tip, it eventually impinged on the cavity surface near the wall, which caused the formation of an open cavity with shed bubbly clouds. Then it was entrained into the TLV, forming an unstable and noisy spiraling pattern, which would enhance the instabilities of the flow field in tip region. It was possible that hub vortices characterizing wing-body junctions might have also played a role. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 27
Main heading: Cavitation
Controlled terms: Axial flow? - ?Computer software? - ?Electric power plant loads? - ?Fighter aircraft? - ?High speed photography? - ?Leakage (fluid)? - ?Pumps? - ?Shear flow? - ?Surface phenomena? - ?Turbulence models ? - ?Vortex flow
Uncontrolled terms: Axial flow pump? - ?Cloud cavitations? - ?Commercial software? - ?Experimental values? - ?Load distributions? - ?Noise and vibration? - ?Rotating instability? - ?Secondary development
Classification code: 618.2 Pumps
Pumps
? - ?631.1 Fluid Flow, General
Fluid Flow, General
? - ?631.1.1 Liquid Dynamics
Liquid Dynamics
? - ?652.1.2 Military Aircraft
Military Aircraft
? - ?723 Computer Software, Data Handling and Applications
Computer Software, Data Handling and Applications
? - ?742.1 Photography
Photography
? - ?931 Classical Physics; Quantum Theory; Relativity
Classical Physics; Quantum Theory; Relativity
DOI: 10.6041/j.issn.1000-1298.2016.08.004
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
53. Property and storage stability of ginger oil nano-emulsions
Accession number: 20163802820509
Authors: Chen, Dong (1); Zhang, Xiaoyang (1); Liu, Yaozheng (2); Yu, Guoyong (1); Liang, Li (1); Li, Quanhong (1)
Author affiliation: (1) College of Food Science and Nutritional Engineering, China Agricultural University, Beijing; 100083, China; (2) Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana; IL; 61801, United States
Corresponding author: Li, Quanhong(liquanhong66@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 47
Issue: 8
Issue date: August 25, 2016
Publication year: 2016
Pages: 233-240
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Ginger oil nano-emulsions was prepared by using the method of ultrasonic emulsification with OSA starch PG Purity Gum 2000 (PG) and Hi-Cap 100 (HC) as emulsifier. The microstructure, rheological characteristic, antimicrobial ability and storage stability of the ginger oil nano-emulsions were studied. The TEM micrographs of emulsions showed that the microstructure was improved by preparing nanoemulsions with ultrasonic emulsification and PG or HC. Steady-shear scanning results showed that ginger oil nanoemulsions were a kind of typical shear thinned rheological fluid and had Newtonian fluid characteristics. Frequency scanning results showed that ginger oil nanoemulsion had viscoelasticity. Nanoembedding systems had no significant influence on the antibacterial ability. PG ginger oil nanoemulsion and HC ginger oil nanoemulsion both had good antimicrobial ability, but the antimicrobial ability of PG ginger oil nanoemulsion was better than that of HC ginger oil nanoemulsion. During the storage of 28 d at 4, 25, 55, PG and HC ginger oil nanoemulsions both showed good physical stability on average particle size and Zeta potential. Both the PG and HC ginger oil nano-emulsions had over 80% retention of the gingerol, which was the main pungent compound of ginger oil. Among the five main volatile compounds, α-curcumene and α-zingiberene had no significant change (p>0.05) during the storage. β-bisabolene and β-sesquiphellandrene had no significant change during storage at 4 (p>0.05). PG ginger oil nano-emulsion had better storage stability than HC ginger oil nano-emulsion. Storage at 4 was more suitable for PG and HC ginger oil nano-emulsions than storage at 25 and 55. This study would provide technical support for the application of ginger oil nano-emulsions in food industry. ? 2016, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 39
Main heading: Oils and fats
Controlled terms: Emulsification? - ?Emulsions? - ?Food additives? - ?Microorganisms? - ?Microstructure? - ?Newtonian liquids? - ?Particle size? - ?Stability? - ?Transmission electron microscopy? - ?Volatile organic compounds
Uncontrolled terms: Antimicrobial ability? - ?Average particle size? - ?Nano-emulsions? - ?Physical stability? - ?Rheological characteristics? - ?Storage stability? - ?Ultrasonic emulsification? - ?Volatile compounds
Classification code: 461.9 Biology
Biology
? - ?802.3 Chemical Operations
Chemical Operations
? - ?803 Chemical Agents and Basic Industrial Chemicals
Chemical Agents and Basic Industrial Chemicals
? - ?804 Chemical Products Generally
Chemical Products Generally
? - ?804.1 Organic Compounds
Organic Compounds
? - ?931.2 Physical Properties of Gases, Liquids and Solids
Physical Properties of Gases, Liquids and Solids
? - ?951 Materials Science
Materials Science
Numerical data indexing: Percentage 8.00e+01%
DOI: 10.6041/j.issn.1000-1298.2016.08.030
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2016 Elsevier Inc.
Data Provider: Engineering Village
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