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2012年第43卷第3期共收錄41篇
1. Accession number:20121814987943
  Title:Influence of coolant temperature on diesel engine heat and power conversion efficiency
  Authors:Gao, Siyuan1 ; Zhao, Changlu1 ; Li, Yunlong1 ; Zhang, Fujun1 ; Zhu, Yanfeng2 
  Author affiliation:1  School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
                  2  Shanghai E-Propulsion Auto Technology Co., Ltd., Shanghai 201800, China
  Corresponding author:Zhao, C. (clzhao@bit.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date: March 2012
  Publication year:2012
  Pages:28-32
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:In order to study the heat and power conversion efficiency of diesel engine with different coolant temperatures, an engine and cooling system co-simulation model was built based on the first law of thermodynamics. This model was established by GT-Suite software to simulate the interaction of engine and cooling system performance parameters. A heat balance experiment of DEUTZ TCD8V2015 diesel engine was designed and executed, and the model was verified by the experimental data. Based on that, the coolant temperature influence of conversion efficiency was researched on the modified model, some rules and tends between the coolant temperature and the heat transfer in the cylinder were obtained. Results indicated that the power conversion efficiency would increase by 2%~3% with coolant temperature raised by 20°C on 30% load of diesel engine.
  Number of references:8
  Main heading:Coolants
  Controlled terms:Computer simulation  -  Conversion efficiency  -  Cooling systems  -  Diesel engines  -  Experiments  -  Specific heat  -  Temperature  -  Thermodynamics  -  Thermoelectric equipment
  Uncontrolled terms:Coolant temperature  -  Cosimulation  -  Experimental data  -  First law of thermodynamics  -  Heat and power  -  Heat balance  -  Modified model  -  Power conversion efficiencies  -  System performance parameters
  Classification code:901.3 Engineering Research  -  803 Chemical Agents and Basic Industrial Chemicals  -  723.5 Computer Applications  -  641.2 Heat Transfer  -  641.1 Thermodynamics  -  621 Nuclear Reactors  -  615.4 Thermoelectric Energy  -  612.2 Diesel Engines  -  525.5 Energy Conversion Issues
  DOI:10.6041/j.issn.1000-1298.2012.03.006
  Database:Compendex

2. Accession number:20121814987972
  Title:Multi-objective reconfiguration and optimal scheduling of service-oriented networked collaborative manufacturing resource
  Authors:Wei, Yun1 ; Li, Dongbo1 ; Tong, Yifei1 
  Author affiliation:1  School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
  Corresponding author:Li, D. (tgnjust@163.com) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:193-199
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:In order to solve reconfiguration and optimal scheduling problems of networked collaborative manufacturing resource, a multi-objective optimization mathematical model was provided with four practical important objectives were considered simultaneously, including minimizing the total production working hours, total production working cost, optimization total production processing quality and resource service quality. A reconfiguration and optimal scheduling method for networked collaborative manufacturing resource was presented based on Pareto multi-objective immune genetic algorithm. In order to ensure the groups variety, prevent the premature convergence problem, some key technologies such as population ranking technique, niche technique, Pareto solution set filter were applied. The genetic operators were improved and self-adaptive crossover and mutation operators were proposed by the algorithm, and immune selection could eliminate semblable individuals. Immune memory was adopted to dynamic search near each approximate optimal solution, so it accelerated search and improved quality of solution. Finally the result of simulation indicated the validity of algorithm.
  Number of references:12
  Main heading:Manufacture
  Controlled terms:Distributed computer systems  -  Genetic algorithms  -  Mathematical models  -  Multiobjective optimization  -  Quality of service  -  Scheduling
  Uncontrolled terms:Approximate optimal solutions  -  Collaborative manufacturing  -  Crossover and mutation  -  Dynamic search  -  Genetic operators  -  Immune genetic algorithms  -  Immune memory  -  Immune selection  -  Key technologies  -  Multi objective   -  Multi objective optimizations (MOO)  -  Niche technique  -  Optimal scheduling  -  Pareto solution  -  Premature convergence  -  Processing quality  -  Quality of solution  -  Ranking technique  -  Resource service  -  Self-adaptive   -  Service Oriented  -  Working costs  -  Working hours
  Classification code:921.5 Optimization Techniques  -  921 Mathematics  -  912.2 Management  -  723 Computer Software, Data Handling and Applications  -  722.4 Digital Computers and Systems  -  718 Telephone Systems and Related Technologies; Line Communications  -  717 Optical Communication  -  716 Telecommunication; Radar, Radio and Television  -  537.1 Heat Treatment Processes
  DOI:10.6041/j.issn.1000-1298.2012.03.035
  Database:Compendex

3. Accession number:20121814987945
  Title:Influences of sediment concentration and water temperature of muddy water on emitter clogging
  Authors:Niu, Wenquan1 ; Liu, Lu1 
  Author affiliation:1  Institute of Soil and Water Conservation, Northwest A and F University, Yangling, Shaanxi 712100, China
  Corresponding author:Niu, W. (nwq@vip.sina.com) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:39-45
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:In order to better understand the causes and the processes of clogging for labyrinth-path emitters, the influences of sediment concentration, sediment particle size distribution and water temperature on emitter clogging were investigated through the intermittent drip irrigation method. The result showed that smaller particles tended to cause emitter be clogged during the irrigation when the particle sized in muddy water were less than 0.1 mm, and the degree of clogging increased remarkably as sediment concentrations increased. The degree of emitter clogging was also impacted by water temperature. Emitters were less likely clogged by muddy water with higher temperature. It was found that in the summer when water temperature was relatively high labyrinth-path emitters were prone to clogging by sediment with particle sizes below 0.031 mm.
  Number of references:26
  Main heading:Temperature
  Controlled terms:Irrigation  -  Particle size analysis  -  Sedimentation  -  Sedimentology
  Uncontrolled terms:Clogging  -  Emitter  -  Sediment concentration  -  Sediment particle size  -  Water temperatures
  Classification code:481.1 Geology  -  641.1 Thermodynamics  -  802.3 Chemical Operations  -  821.3 Agricultural Methods  -  951 Materials Science
  DOI:10.6041/j.issn.1000-1298.2012.03.008
  Database:Compendex

4. Accession number:20121814987953
  Title:Characteristic analysis of pressure fluctuation of unsteady flow in screw-type centrifugal pump with small blade
  Authors:Yuan, Shouqi1 ; Zhou, Jianjia1 ; Yuan, Jianping1 ; Zhang, Jinfeng1 ; Xu, Yuping1 ; Li, Tong1 
  Author affiliation:1  Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
  Corresponding author:Yuan, S. (shouqiy@ujs.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:83-87 92
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:In order to research pressure fluctuation of unsteady flow in screw-type centrifugal pump with small blade, three-dimensional unsteady flow field of the pump was simulated numerically to the screw-type centrifugal pump with and without small blade based on Navier-Stokes equations and k-Ε turbulent model. Pressure fluctuations in the outlet of pump and in the volute were obtained at different flow rates. The analysis results indicated that the pressure wave in the pump was always periodic in the two models, and impeller blade passing frequency was the dominant frequency. Compared with the result of single blade at different flow rates, the period decreased to half, and the amplitudes of pressure fluctuations in the pump was smaller, the high-frequency components were also fewer. The analysis results indicate that the adding of small blade in impeller of screw-type centrifugal pump with single blade can not only decrease the pressure fluctuation of unsteady flow in the pump, but also decrease oscillations in volute.
  Number of references:13
  Main heading:Screws
  Controlled terms:Centrifugal pumps  -  Flow rate  -  Impellers  -  Navier Stokes equations  -  Three dimensional  -  Unsteady flow
  Uncontrolled terms:Characteristic analysis  -  Dominant frequency  -  High frequency components  -  Impeller blades  -  Pressure fluctuation  -  Pressure waves  -  Single blades  -  Small blade  -  Three-dimensional unsteady flow  -  Turbulent models
  Classification code:601.2 Machine Components  -  605 Small Tools and Hardware  -  618.2 Pumps  -  631 Fluid Flow  -  631.1 Fluid Flow, General  -  902.1 Engineering Graphics
  DOI:10.6041/j.issn.1000-1298.2012.03.016
  Database:Compendex

5. Accession number:20121814987954
  Title:Design and experiment of the two-dimensional PIV automatic control system for laminar entrained flow reactor
  Authors:Yang, Yanqiang1 ; Yi, Weiming2 ; Li, Zhihe2 ; Bai, Xueyuan2 ; Li, Yongjun2 
  Author affiliation:1  School of Engineering, Shenyang Agricultural University, Shenyang 110161, China
                  2  School of Agricultural and Food Engineering, Shandong University of Technology, Zibo 255049, China
  Corresponding author:Yi, W. (yiweiming@sdut.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:88-92
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:In the cold PIV (particle image velocimetry) system of the laminar entrained flow reactor, the relative position between the camera and the measuring tube was an important condition to ensure accurate test data. To make the PIV operation more convenient, accurate, and fast in the test, two-dimensional PIV automatic control system was designed. And the reliability of the system was tested in the cold simulation equipment of laminar flow furnace, compared with no using two-dimensional PIV automatic control system, the results showed that in different sections of the measuring tube, the particle speed of the axial center achieves a smooth transition, and eliminates the jump change; when collection distance is 350mm and main air flow rate is 1.5 m3/h, the relative error of particle residence time is 9.218%; and the operation saves time and effort in the test process. These suggested that the two-dimensional PIV automatic control system could satisfy the cold test of the laminar entrained flow reactor needs, achieve uniform and continuous test, reduce human error and improve the accuracy of test data.
  Number of references:16
  Main heading:Two dimensional
  Controlled terms:Control  -  Flow rate  -  Flow visualization  -  Laminar flow  -  Tubes (components)  -  Velocimeters  -  Velocity measurement
  Uncontrolled terms:Air flow-rate  -  Biomass char  -  Cold tests  -  Human errors  -  Laminar entrained flow reactor  -  Particle image velocimetries  -  Particle residence time  -  Relative errors  -  Relative positions  -  Smooth transitions   -  Test data  -  Test process
  Classification code:943.3 Special Purpose Instruments  -  902.1 Engineering Graphics  -  732 Control Devices  -  731 Automatic Control Principles and Applications  -  631.1 Fluid Flow, General  -  631 Fluid Flow  -  616.1 Heat Exchange Equipment and Components
  DOI:10.6041/j.issn.1000-1298.2012.03.017
  Database:Compendex

6. Accession number:20121814987951
  Title:Numerical simulation of flow field characteristics in tip clearance region of axial-flow impeller
  Authors:Zhang, Desheng1 ; Shi, Weidong1 ; Zhang, Hua1 ; Li, Tongtong1 ; Zhang, Guangjian1 
  Author affiliation:1  Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
  Corresponding author:Zhang, D. (zds@ujs.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:73-77
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The flow in end wall region of axial-flow impeller has an important impact on flow structure, energy transfer and hydraulic efficiency. The hydraulic axial-flow pump models with different tip clearance sizes were simulated based on CFD technology and high-quality structured grid. The influence of tip clearance on the meridional velocity and circulation distributions in impeller inlet and outlet were discussed, and the leakage vortex generation mechanism and its structure were analyzed as well. The numerical results were compared with high-speed photography experimental results. The investigation results showed that tip clearance led to non-uniform meridional velocity distribution in impeller inlet and secondary flow in end wall region occurred, meridional velocity near tip clearance in impeller outlet decreased, and the bigger the gap was, the bigger decline of meridional velocity would be. The secondary recirculation near the wheel led to circulation of impeller inlet, when the gap increased to 2 mm, about 50% of the whole flow passage appeared circulation which impacted by the tip leakage vortex. The trajectory and structure of tip leakage vortex in the numerical simulation showed agreement with the experimental results. Under the small flow rate conditions, the leakage vortex strength and the influence regional scale were increased.
  Number of references:13
  Main heading:Computer simulation
  Controlled terms:Boiler circulation  -  Energy transfer  -  High speed photography  -  Impellers  -  Leakage (fluid)  -  Velocity  -  Velocity distribution  -  Vortex flow
  Uncontrolled terms:Axial flow pump  -  Circulation distribution  -  End-wall region  -  Flow field characteristics  -  High quality  -  Hydraulic efficiency  -  Impeller inlets  -  Impeller outlet  -  Leakage vortex  -  Numerical results   -  Recirculations  -  Regional scale  -  Small flow-rate  -  Structured grid  -  Tip clearance  -  Tip clearance sizes  -  Tip leakage vortex  -  Whole flow passage
  Classification code:931.3 Atomic and Molecular Physics  -  931.1 Mechanics  -  742.1 Photography  -  723.5 Computer Applications  -  641.2 Heat Transfer  -  631.1 Fluid Flow, General  -  614.2 Steam Power Plant Equipment and Operation  -  601.2 Machine Components  -  452.3 Industrial Wastes
  DOI:10.6041/j.issn.1000-1298.2012.03.014
  Database:Compendex

7. Accession number:20121814987978
  Title:Cyclical slit flow of concentricity under the moving boundary condition
  Authors:Li, Yongye1 ; Sun, Xihuan1 ; Li, Fei1 ; Zhang, Jinglun1 
  Author affiliation:1  College of Water Resource Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
  Corresponding author:Sun, X. (sunxihuan@tyut.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:230-234
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:In order to perfect the theory on the cyclical slit flow of concentricity, the distribution features of the cyclical slit flow were analyzed from stopping to starting and to run procedure on the cylinder by a combination of theoretical analysis and model experiments. It is concluded that the speeds of the cylinders, the gap widths and the discharges have effect on the distribution and magnitude of the cyclical slit flow. The cyclical slit flow velocity increased firstly and then decreased as the gap width enlarged. When the gap width was about 2 cm, the cyclical slit flow velocity reached a maximum. The larger the discharge was, the larger the cyclical slit flow velocity would be. The larger the speed of the cylinder was, the larger the cyclical slit flow velocity would be. The cyclical slit flow rate increased to the maximum before the speed of the cylinder, the cyclical slit flow rate and the water velocity in the pipe intersect decreased to the minimum after that. Meanwhile mathematical model of the cyclical slit flow of concentricity under the moving boundary condition was established. The calculated values and experimental values are in substantial agreement and maximum relative error is no more than 8.5%, which showed the mathematical model is rational.
  Number of references:7
  Main heading:Flow velocity
  Controlled terms:Boundary conditions  -  Cylinders (shapes)  -  Flow rate  -  Mathematical models
  Uncontrolled terms:Analysis and models  -  Calculated values  -  Concentricity  -  Cyclical slit flow  -  Experimental values  -  Gap widths  -  Maximum relative errors  -  Moving boundaries  -  Moving boundary conditions  -  Water velocities
  Classification code:408.2 Structural Members and Shapes  -  631 Fluid Flow  -  921 Mathematics
  DOI:10.6041/j.issn.1000-1298.2012.03.041
  Database:Compendex

8. Accession number:20121814987938
  Title:Hydrogen fueled constant volume combustion simulation apparatus
  Authors:Liu, Xinghua1 ; Fan, Zhiqiang1 ; Jiu, Jian'gang1 ; Wang, Ruwei1 
  Author affiliation:1  School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
  Corresponding author:Liu, X. (lxh@bit.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:1-4 9
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:A hydrogen fueled constant volume combustion simulation apparatus was designed. By means of Schlieren method, combustion characteristics of hydrogen-air pre-mixture were studied in the apparatus on the condition of no adaptor and built-in one. The result showed that it was able to simulate the auto-ignition of the pre-mixture. Under the experimental conditions, there was a jet of flames on both sides of the spherical flame respectively in the test with no adaptor; the auto-ignition of unburned gas appeared firstly in the angle between the spherical flame front and the chamber wall. In the test with built-in adaptor, it could achieve auto-ignition through both plans. The second plan can effectively prevent the flame propagation from the upper chamber to the lower one, and the unburned gas was auto-ignited.
  Number of references:7
  Main heading:Hydrogen
  Controlled terms:Combustion
  Uncontrolled terms:Adaptor  -  Auto-ignition  -  Built-in adaptor  -  Chamber walls  -  Combustion characteristics  -  Combustion simulations  -  Constant volume combustion bomb  -  Constant volumes  -  Experimental conditions  -  Flame propagation   -  Schlieren method  -  Spherical flames  -  Unburned gas
  Classification code:521.1 Fuel Combustion  -  804 Chemical Products Generally
  DOI:10.6041/j.issn.1000-1298.2012.03.001
  Database:Compendex

9. Accession number:20121814987974
  Title:Kinematics analysis of spatial 4-SPS/CU parallel mechanism
  Authors:Wang, Gengxiang1 ; Yuan, Daning1 ; Liu, Hongzhao1 ; Wu, Xianwei1 
  Author affiliation:1  School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, China
  Corresponding author:Wang, G. (wanggengxiang27@163.com) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:207-212 199
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Spatial parallel mechanism of a novel 4-SPS/CU that can perform three-dimensional rotations and translation about Z axis was presented. The parallel mechanism of 4-SPS/CU, with SPS-limp regarded as the driver and CU-limp regarded as the driven, was synthesized. The principles that the mechanism could perform the above motions were analyzed based on the screw theory, and the degree of freedom of the mechanism was calculated. The forward and reverse solutions of position analysis were presented, then the Jacobian matrix of the mechanism was derived and its velocity, acceleration performance, singular configuration and workspace were analyzed.
  Number of references:12
  Main heading:Kinematics
  Controlled terms:Jacobian matrices  -  Mechanisms
  Uncontrolled terms:Acceleration performance  -  Degree of freedom  -  Kinematics analysis  -  Parallel mechanisms  -  Position analysis  -  Reverse solution  -  Screw theory  -  Singular configurations  -  Spatial parallel mechanism  -  Three-dimensional rotation   -  Workspace
  Classification code:601.3 Mechanisms  -  921.1 Algebra  -  931.1 Mechanics
  DOI:10.6041/j.issn.1000-1298.2012.03.037
  Database:Compendex

10. Accession number:20121814987940
  Title:Influences of intake flow on spray and wall-film for port fuel injection gasoline engine
  Authors:Ma, Zongzheng1, 2 ; Cheng, Yong1 ; Ji, Shaobo1 ; Yang, Yongguang1 
  Author affiliation:1  School of Energy and Power Engineering, Shandong University, Ji'nan 250061, China
                 2  Department of Mechanical Engineering, Henan Institute of Engineering, Zhengzhou 451191, China
  Corresponding author:Ma, Z. (zongzhengma@163.com) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:10-15 27
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The influences of intake flow on spray and wall-film were studied by using numerical simulation and test-bed experiment. Some results were received and they showed that the intake flow was useful for liquid fuel evaporation before impinged on the wall and could increases the spay penetration and deflect the spray in the direction of the intake flow. Meanwhile, the momentum of the spray droplets was strengthened and more small droplets could be received by the intake air flow which can enlarge the wall-film area and improve the evaporation of wall-film. If the engine body temperature was low, the effect of intake flow on engine performance was obvious while it had no difference under wide throttle open angle for high engine temperature.
  Number of references:11
  Main heading:Intake systems
  Controlled terms:Drop formation  -  Evaporation  -  Fuel injection  -  Gasoline  -  Machine design  -  Phase transitions
  Uncontrolled terms:Body temperature  -  Engine performance  -  Fuel evaporation  -  Gasoline engines  -  Intake air  -  Intake flow  -  Port fuel injections  -  Small droplets  -  Spray and wall-film  -  Spray droplet
  Classification code:931.2 Physical Properties of Gases, Liquids and Solids  -  802.3 Chemical Operations  -  801.4 Physical Chemistry  -  631.1 Fluid Flow, General  -  601 Mechanical Design  -  523 Liquid Fuels  -  521 Fuel Combustion and Flame Research
  DOI:10.6041/j.issn.1000-1298.2012.03.003
  Database:Compendex

11. Accession number:20121814987955
  Title:Flow fields simulation of biomass gasifier under active air distribution
  Authors:Guo, Feiqiang1 ; Dong, Yuping1 ; Jing, Yuanzhuo2 ; Dong, Lei2 ; Wang, Hui1 ; Du, Hongguang1 
  Author affiliation:1  School of Mechanical Engineering, Shandong University, Ji'nan 250061, China
                 2  Shandong Baichuan Tongchuang Energy Company, Ltd., Ji'nan 250101, China
  Corresponding author:Dong, Y. (dongyp@sdu.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:93-96 102
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Two layers of air distribution were designed to actively control the agent feed in down-draft fixed bed biomass gasifier. The pressure and velocity distribution inside the gasifier were studied by simulation analysis. The pressure field displayed the law of step distribution and obvious boundaries. The velocity pattern was higher from top to down with high level of uniformity in the same section. Experiments were done to test the pressure and temperature distribution in the gasifier by using corn stalk as materials. The results showed that it had an important effect of active air distribution on promoting the reaction uniformity. The temperature kept stability at the same section with little changes of the gas components, and calorific value kept above 5500 kJ/m3. This method can provide a new way to improve the working performance of the fixed gasifier.
  Number of references:15
  Main heading:Biomass
  Controlled terms:Agricultural engineering  -  Gasification  -  Mechanical engineering
  Uncontrolled terms:Air distribution  -  Biomass gasifier  -  Corn stalk  -  Fixed bed  -  Gas component  -  Gasifiers  -  Pressure and temperature  -  Pressure and velocity distributions  -  Pressure field  -  Simulation analysis   -  Two layers  -  Velocity patterns
  Classification code:608 Mechanical Engineering, General  -  802.3 Chemical Operations  -  821 Agricultural Equipment and Methods; Vegetation and Pest Control  -  821.5 Agricultural Wastes
  DOI:10.6041/j.issn.1000-1298.2012.03.018
  Database:Compendex

12. Accession number:20121814987959
  Title:Predicating moisture content of pearl barley based on dielectric properties
  Authors:Guo, Wenchuan1 ; Wang, Jing1 ; Liu, Chi1 
  Author affiliation:1  College of Mechanical and Electronic Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
  Corresponding author:Guo, W. (guowenchuan69@126.com) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:113-117
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Pearl barley was used to study the influence of frequency (1~1000 kHz), temperature (5~40°C) and moisture content (14.7%~22.7%) on the relative dielectric constant. The reasons for dielectric constant changed with these factors were analyzed. Furthermore, the mathematical model for predicating moisture content of pearl barley based on the dielectric constant and temperature at 100 kHz was established, and the model was verified. The results indicated that the dielectric constant of pearl barley increased as moisture content and temperature increasing, decreased with frequency increasing over the frequency range from 1~1000 kHz. The relationship between the dielectric constant, temperature and moisture content can be described by cubic polynomial, with the coefficient of determination of 0.9976 at 100 kHz. Obvious linear relationship was observed between measured moisture contents and calculated moisture contents, with coefficient of determination of 0.9977.
  Number of references:18
  Main heading:Moisture determination
  Controlled terms:Dielectric properties  -  Gems  -  Mathematical models  -  Moisture  -  Nondestructive examination
  Uncontrolled terms:Coefficient of determination  -  Cubic polynomials  -  Frequency ranges  -  Linear relationships  -  Non-destructive test  -  Pearl barley  -  Relative dielectric constant
  Classification code:421 Strength of Building Materials; Mechanical Properties  -  482.2.1 Gems  -  701 Electricity and Magnetism  -  801.4 Physical Chemistry  -  921 Mathematics   -  944.2 Moisture Measurements
  DOI:10.6041/j.issn.1000-1298.2012.03.022
  Database:Compendex

13. Accession number:20121814987964
  Title:Separation of ovalbumin and lysozyme from chicken egg white using two-stage ultrafiltration technique
  Authors:Huang, Qun1, 2 ; Ma, Meihu1 ; Huang, Xi1 ; Geng, Fang1 ; He, Mengli1 
  Author affiliation:1  College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
                  2  Institute of Food Science, Jishou University, Jishou 416000, China
  Corresponding author:Ma, M. (mameihuhn@yahoo.com.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:146-151
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The possibility of using two-stage ultrafiltration technique to separate ovalbumin and lysozyme from chicken egg white was investigated. Based on the mechanism of ultrafiltration, main factors that affecting the permeate flux and total proteins concentration in permeating liquor, such as initial feed concentration, pH value and trans-membrane pressure (TMP) were studied. After ascertaining the ultrafiltration time by examining the change of permeate flux, the optimum ultrafiltration conditions were supposed to be as the follows: initial feed concentration, 6.0%; pH value, 2.5; TMP, 0.12 MPa. In these optimum conditions, purity and yield of ovalbumin was 85.72% and 51.36% respectively, and that of lysozyme was 87.21% and 62.58% respectively, implying that separation efficiency was satisfied. The experimental results show that it is feasible for two-stage ultrafiltration technique to separate ovalbumin and lysozyme from chicken egg white in bulk and high efficiently.
  Number of references:26
  Main heading:Ultrafiltration
  Controlled terms:Animals  -  Enzymes  -  pH  -  Separation  -  Thermomechanical pulping process
  Uncontrolled terms:Chicken egg white  -  Initial feed concentration  -  Optimum conditions  -  Ovalbumins  -  Permeate flux  -  pH value  -  Separation efficiency  -  Total protein  -  Transmembrane pressures  -  Two-stage ultrafiltration technique
  Classification code:821 Agricultural Equipment and Methods; Vegetation and Pest Control  -  814 Leather and Tanning  -  811.1 Pulp and Paper  -  802.3 Chemical Operations  -  822 Food Technology  -  801.2 Biochemistry  -  471 Marine Science and Oceanography  -  461.2 Biological Materials and Tissue Engineering  -  461 Bioengineering and Biology  -  801.1 Chemistry, General
  DOI:10.6041/j.issn.1000-1298.2012.03.027
  Database:Compendex

14. Accession number:20121814987975
  Title:Dynamics optimization design of high-speed spatial parallel coordinate measuring machine
  Authors:Chen, Xiulong1 ; Jia, Shuaishuai1 ; Deng, Yu1 
  Author affiliation:1  College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266510, China
  Corresponding author:Chen, X. (cxldy99@163.com) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:213-218
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:In order to improve dynamic characteristics of high-speed spatial PCMM (parallel coordinate measuring machine), the virtual prototype technology was applied to the elastodynamics optimization design of PCMM. Integrating CAD, CAE and visual technologies, the rigid-flexible virtual prototyping of PCMM was built. The influence law of the mass of moving platform and the diameter of driving limbs on the dynamic behaviors, including kinematics output response and maximum dynamic stress of driving limbs were discussed. On these grounds, the mass of moving platform and the diameter of driving limbs were optimized. The optimal results, which include the mass of moving platform of 80.85 kg and the diameter of driving limbs of 44 mm, were obtained. The simulation results showed the maximum dynamic stress of driving limbs were decreased to 17.5 MPa, the kinematics output response were also reduced, so that the obvious improvement of the dynamics characteristics for PCMM was realized, and the powerful theoretical basis and method were provided.
  Number of references:10
  Main heading:Optimization
  Controlled terms:Coordinate measuring machines  -  Flexible couplings  -  Kinematics  -  Scanning
  Uncontrolled terms:Dynamic behaviors  -  Dynamic characteristics  -  Dynamic stress  -  Dynamics characteristic  -  Elasto-dynamics optimization  -  High-speed  -  Moving platform  -  Optimal results  -  Optimization design  -  Output response   -  Parallel coordinate measuring machines  -  Rigid flexible coupling  -  Rigid-flexible  -  Theoretical basis  -  Virtual prototype  -  Virtual Prototype Technology  -  Virtual prototyping
  Classification code:602.2 Mechanical Transmissions  -  741.3 Optical Devices and Systems  -  921.5 Optimization Techniques  -  931.1 Mechanics  -  943.3 Special Purpose Instruments
  DOI:10.6041/j.issn.1000-1298.2012.03.038
  Database:Compendex

15. Accession number:20121814987950
  Title:Numerical simulation on cavitation unsteady characteristics in centrifugal pump
  Authors:Wang, Xiuli1 ; Yuan, Shouqi1 ; Zhu, Rongsheng1 ; Fu, Qiang1 ; Yu, Zhijun2 
  Author affiliation:1  Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
                  2  Jiangsu Zhenhua Pump Manufacturing Co., Ltd., Taizhou 225500, China
  Corresponding author:Wang, X. (jsuwxl@163.com) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:67-72
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:In order to study internal flow variation when centrifugal pump cavitations occur, three-dimensional modeling was used for centrifugal pumps internal flow through three-dimensional software Pro/E. Based on the Reynolds-averaged N-S equations with the RNG k-Ε turbulence model and SIMPLEC algorithm, the full-cavitation model was used considering effects on cavitations when the gas was not dissolved in the water. By using the computational fluid dynamics software CFX, the numerical simulation calculation of vapor-liquid two-phase turbulence within whole flow passage of centrifugal pump was conducted and the laws of the unsteady flow when centrifugal pump cavitations occur were analyzed. The results show that within this range from the newborn to the critical cavitations NPSH, the gas volume fraction mainly begins from dimensionless radial position 0.2, and the gas volume fraction density correspondingly increases with the lower of NPSH. Affected by asymmetry distribution under the effect of the impeller and volute coupling, in the newborn of cavitations, impeller pressure fluctuations were sinusoidal periodic variation. With the lower of NPSH and gas volume fraction increasing, impeller pressure is changing irregularly. From the beginning of the tongue, along the impeller rotating direction, pressure fluctuation gradually declines.
  Number of references:12
  Main heading:Cavitation
  Controlled terms:Centrifugal pumps  -  Computational fluid dynamics  -  Computer simulation  -  Flowmeters  -  Impellers  -  Navier Stokes equations  -  Three dimensional  -  Turbulence models  -  Unsteady flow
  Uncontrolled terms:Computational Fluid Dynamics software  -  Gas volume fraction  -  Internal flows  -  N-S equations  -  Numerical simulation calculation  -  Periodic variation  -  Pressure fluctuation  -  Radial position  -  Rotating direction  -  SIMPLEC algorithm   -  Three-dimensional modeling  -  Two-phase turbulence  -  Unsteady characteristics  -  Vapor-liquid  -  Whole flow passage
  Classification code:601.2 Machine Components  -  618.2 Pumps  -  631.1 Fluid Flow, General  -  631.1.1 Liquid Dynamics  -  723.5 Computer Applications  -  943.1 Mechanical Instruments
  DOI:10.6041/j.issn.1000-1298.2012.03.013
  Database:Compendex

16. Accession number:20121814987967
  Title:In-greenhouse cucumber recognition based on machine vision and least squares support vector machine
  Authors:Wang, Haiqing1 ; Ji, Changying1 ; Gu, Baoxing1 ; An, Qiu1 
  Author affiliation:1  College of Engineering, Nanjing Agricultural University, Nanjing 210031, China
  Corresponding author:Ji, C. (chyji@njau.edu.cn) 
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:163-167 180
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Pulse coupled neural network (PCNN) and mathematical morphological technologies were employed to separate the mature in-greenhouse cucumber from complex background image. Four geometric feature values and three texture feature values based on gray level co-occurrence matrix (GLCM) of every connected regions in image were extracted, which were the input feature vector of least squares support vector machine (LS-SVM). The trained classifier was used for identifying the cucumber in image. Experimental results showed that 70 cucumber images were used for testing, the average rate of correct identification reach to 82.9% in different conditions, indicating that the method based on PCNN and LS-SVM could be used for in-greenhouse cucumber recognition.
Number of references:18
  Main heading:Image texture
  Controlled terms:Computer vision  -  Greenhouses  -  Mathematical morphology  -  Morphology  -  Neural networks  -  Support vector machines  -  Textures
  Uncontrolled terms:Average rate  -  Complex background  -  Connected region  -  Cucumber  -  Geometric feature  -  Gray level co-occurrence matrix  -  Input features  -  Least squares support vector machines  -  Pulse coupled neural network  -  Texture features
  Classification code:402.1 Industrial and Agricultural Buildings  -  723 Computer Software, Data Handling and Applications  -  933 Solid State Physics  -  951 Materials Science
  DOI:10.6041/j.issn.1000-1298.2012.03.030
  Database:Compendex

17. Accession number:20121814987942
  Title:Bag-type DPF regenerated by intake flow and high-pressure air reverse blow and in-cylinder combustion of particulate
  Authors:Fang, Xianzhong1 ; Li, Guoliang1 ; Yan, Shufang1 ; Jiang, Beiping1 
  Author affiliation:1  State Key Laboratory of Automobile Simulation and Control, Jilin University, Changchun 130025, China
  Corresponding author:Fang, X. (fangxz@jlu.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:22-27
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:A dual diesel particulate filter system was developed by using the heat resistant filter bag as filtering element. The intake fresh air of the diesel engine was used to blow off the deposited particulate matters (PM) and send them back to the cylinder. The blow-off PM in the filter was assisted by high-pressure air scanning reverse flow. The PM burning in the cylinder realized the regeneration of the filter. The verification tests were performed in the dynamometer test bed with a single-cylinder diesel engine. Under the steady operating condition, and the filtering time span was equaled to the regeneration time span, the resistance of intake and exhaust of bag-type-filter rehabilitated thoroughly. It showed that the intake process of the intake fresh air and high-pressure air could blow off the deposited PM on the outer surface of the bag, ensure the successful regeneration of the bag-type-filter with filtering efficiency of 82%~94%.
  Number of references:9
  Main heading:Air filters
  Controlled terms:Air intakes  -  Cylinders (shapes)  -  Diesel engines  -  Equipment testing  -  Filtration  -  Fuel filters
  Uncontrolled terms:Blow off  -  Compress air  -  Diesel particulate filters  -  Filtering efficiency  -  Filtering elements  -  Fresh air  -  Heat resistant  -  In-cylinder combustion  -  Intake and exhaust  -  Intake flow   -  Outer surface  -  Particulate Matter  -  Regeneration  -  Regeneration time  -  Reverse flow  -  Single-cylinder diesel engine  -  Steady operating conditions  -  Time span  -  Verification tests
  Classification code:944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments  -  943 Mechanical and Miscellaneous Measuring Instruments  -  942 Electric and Electronic Measuring Instruments  -  941 Acoustical and Optical Measuring Instruments  -  802.3 Chemical Operations  -  802.1 Chemical Plants and Equipment  -  631.1 Fluid Flow, General  -  612.2 Diesel Engines  -  523 Liquid Fuels  -  522 Gas Fuels  -  408.2 Structural Members and Shapes
  DOI:10.6041/j.issn.1000-1298.2012.03.005
  Database:Compendex

18. Accession number:20121814987966
  Title:Recognition of overlapping tomatoes based on edge curvature analysis
  Authors:Xiang, Rong1, 2 ; Ying, Yibin1 ; Jiang, Huanyu1 ; Rao, Xiuqin1 ; Peng, Yongshi1 
  Author affiliation:1  College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
                   2  College of Quality and Safety Engineering, China Jiliang University, Hangzhou 310018, China
  Corresponding author:Ying, Y. (yingyb@zju.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:157-162
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:In order to improve the recognition accuracy, a method of overlapping tomatoes recognition based on curvature analysis of edge points was presented. Edges of tomatoes were extracted from binary image at first. Then curvature values could be acquired after edge points were sorted counterclockwise. The edge points with abnormal curvature values were abandoned. After circle regression for remaining edges, overlapping tomatoes could be recognized. In order to decrease the negative impact on recognition aroused from environmental lighting variation and occlusion caused by leaves and branches, threshold segmentation method based on normalization aberration, 6 rules for edge recognition and 3 rules for circle regression were adopted. The experimental results of 119 images showed that the recognition accuracy for overlapping tomatoes with slight occlusion was 90.9%, it was 76.9% when the occlusion rate was between 25% and 50%, and it was 23% when the occlusion rate was larger than 50%.
  Number of references:16
  Main heading:Fruits
  Controlled terms:Agricultural engineering  -  Mechanical engineering
  Uncontrolled terms:Curvature  -  Harvesting robot  -  Overlapping  -  Recognition  -  Tomato
  Classification code:608 Mechanical Engineering, General  -  821 Agricultural Equipment and Methods; Vegetation and Pest Control  -  821.4 Agricultural Products
  DOI:10.6041/j.issn.1000-1298.2012.03.029
  Database:Compendex

19. Accession number:20121814987952
  Title:Hydraulic performance effect of impeller inlet edge position on deep-well centrifugal pump
  Authors:Zhou, Ling1 ; Shi, Weidong1 ; Lu, Weigang1 ; Huang, Ping1 ; Pei, Bing1 
  Author affiliation:1  Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
  Corresponding author:Shi, W. (wdshi@ujs.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:78-82
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:For a typical 150QJ20 type deep-well centrifugal pump, three positions of the impeller inlet edge were designed. The whole flow field of the deep-well centrifugal pump was simulated with Fluent code based on standard k-Ε turbulence model and the SIMPLEC arithmetic. The static pressure and turbulent flow field were compared, the impact of the position of impeller inlet edge on the hydraulic performance was analyzed. The results showed that appropriate extend the impeller inlet edge could reduce the turbulence intensity of impeller exports and improve the flow field, also could reduce the impeller inlet diameter and increase the hydraulic performance of deep-well centrifugal pump.
  Number of references:11
  Main heading:Impellers
  Controlled terms:Centrifugal pumps  -  Computer simulation  -  Flow fields  -  International trade  -  Turbulence models
  Uncontrolled terms:Fluent code  -  Hydraulic performance  -  Impeller inlets  -  SIMPLEC  -  Static pressure  -  Turbulence intensity
  Classification code:601.2 Machine Components  -  618.2 Pumps  -  631.1 Fluid Flow, General  -  723.5 Computer Applications  -  902.3 Legal Aspects
  DOI:10.6041/j.issn.1000-1298.2012.03.015
  Database:Compendex

20. Accession number:20121814987947
  Title:Pedotransfer functions of soil water retention curve based on joint multifractal
  Authors:Liu, Jilong1 ; Ma, Xiaoyi2 ; Zhang, Zhenhua3 ; Fu, Qiang1 
  Author affiliation:1  College of Water Conservancy and Architecture, Northeast Agricultural University, Harbin 150030, China
                 2  College of Hydraulic and Architectural Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
                 3  Geography and Planning Department, Ludong University, Yantai 264025, China
  Corresponding author:Liu, J. (dragon6688495@yahoo.com.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:51-56
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The factors that have obvious effects on spatial variability at the different scales were identified with joint multifractal, and pedotransfer functions of van Genuchten model parameters which considered scale effect at small and large scale were established based on the above educed conclusion, furthermore, feasibility that concluded and educed at small scale with joint multifractal and applied at large scale was explored. The results showed that root mean square error of forecasted soil water content based on pedotransfer functions of van Genuchten model parameters in 0~20 cm and 20~40 cm soil layers at small scale was 0.0386 and 0.0473 respectively, and RMSE of forecasted soil water content based on pedotransfer functions of van Genuchten model parameters in 0~20 cm and 20~40 cm soil layers at large scale was 0.0270 and 0.0304 respectively; conclusions educed at small scale with joint multifractal could be applied at large scale, and pedotransfer functions based on these conclusions had strong theoretical foundation and high precision.
  Number of references:17
  Main heading:Fractals
  Controlled terms:Geologic models  -  Mean square error  -  Soil moisture
  Uncontrolled terms:Different scale  -  High precision  -  Multi fractals  -  Pedotransfer functions  -  Root mean square errors  -  Scale effects  -  Small scale  -  Soil layer  -  Soil water content  -  Soil water retention curves   -  Spatial variability  -  Theoretical foundations  -  Van Genuchten model
  Classification code:481.1 Geology  -  483.1 Soils and Soil Mechanics  -  731.1 Control Systems  -  921 Mathematics
  DOI:10.6041/j.issn.1000-1298.2012.03.010
  Database:Compendex

21. Accession number:20121814987939
  Title:Eigenvector-based research on in-cylinder flow field of gasoline engines
  Authors:Hou, Shengzhi1 ; Lü, Yong1 ; Zhan, Zhangsong2 ; Liu, Bin2 ; Zhang, Wei1 ; Yu, Yong1 
  Author affiliation:1  Internal Combustion Engine Research Institute, Tianjin University, Tianjin 300072, China
                  2  Chongqing Chang An Automobile Co., Ltd., Chongqing 400020, China
  Corresponding author:Hou, S. (houshengzhi@tju.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:5-9
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:A novel double eigen angle-based steady-state flow test rig to comprehensively investigate port generated air flow inside a 4-valve EFI gasoline engine cylinder head was developed. The concept of eigenvector was introduced and the eigenvector path of the in-cylinder tumble flow was protracted; besides, the eigenvector table under different valve lifts in the dummy cylinder was shown to get a macroscopical reflection of the intensity, the tested plane, the vector direction and the distribution of the inclined swirl. In the process of the optimizing the intake system of the engine, a new methodology and comprehensive data basis were provided to organize the optimization the regional and the strength of the appropriate in-cylinder air movement, and improve the performance of the engine.
  Number of references:11
  Main heading:Eigenvalues and eigenfunctions
  Controlled terms:Air  -  Air engines  -  Engine cylinders  -  Gasoline  -  Optimization  -  Steady flow
  Uncontrolled terms:4-Valve  -  Air flow  -  Air motion  -  Air movement  -  Different valve lift  -  EFI gasoline engine  -  Gasoline engines  -  In-cylinder flows  -  Steady-state flows  -  Tumble flow
  Classification code:921.5 Optimization Techniques  -  921.1 Algebra  -  804 Chemical Products Generally  -  641 Heat and Mass Transfer; Thermodynamics  -  631.1 Fluid Flow, General  -  612.1.1 Internal Combustion Engine Components  -  523 Liquid Fuels
DOI:10.6041/j.issn.1000-1298.2012.03.002
  Database:Compendex

22. Accession number:20121814987948
  Title:Effect of microbial on carbon distribution in brown soil aggregates under different fertilization
  Authors:Wang, Liang1 ; Sun, Xiangyang1 ; Liu, Kefeng2 
  Author affiliation:1  School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
                2  College of Urban and Rural Development, Beijing University of Agriculture, Beijing 102206, China
  Corresponding author:Sun, X. (sunxy@bjfu.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:57-61 82
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Various particle-size fractions of soil aggregates were obtained with the wet-screening method from the soil of a long-term stationary fertilization experimental field of Beijing Yanqing Lvfulong organic vegetables farms to analyze the effect of microbial communities on carbon distribution in brown soil aggregates under different fertilizations with sequence analysis by 16SrDNA-PCR-DGGE technology. Results showed that with different fertilization treatments, treatments OF (organic fertilizer) increased 0.25~2 mm water stable aggregates by 109.0%; compared to CK (unfertilized), 0.053~0.25 mm and 0~0.053 mm particle aggregates decreased by 31.9% and 142.1%, respectively. Treatments OF significantly increased carbon content in aggregates of all particle sizes by 15.2%~46.9% compared to CK, and in the >2 mm aggregates by 46.9%. The content of brown soil carbon was positively related to the content of the >2 mm aggregates; significantly positive related to the content of the 0.25~2 mm aggregates, but significantly negative related to the content of the 0.053~0.25 mm aggregates; negative related to the content of the 0~0.053 mm aggregates.
  Number of references:12
  Main heading:Aggregates
  Controlled terms:Agglomeration  -  Carbon  -  Fertilizers  -  Microorganisms  -  Polymerase chain reaction  -  Soils
  Uncontrolled terms:Brown soil  -  Carbon content  -  Carbon distribution  -  Microbial communities  -  Organic fertilizers  -  Particle aggregates  -  Particle-size fractions  -  PCR-DGGE  -  Sequence analysis  -  Soil aggregate   -  Water stable aggregates  -  Wet-screening
  Classification code:406 Highway Engineering  -  483.1 Soils and Soil Mechanics  -  801.2 Biochemistry  -  802.3 Chemical Operations  -  804 Chemical Products Generally
  DOI:10.6041/j.issn.1000-1298.2012.03.011
  Database:Compendex

23. Accession number:20121814987962
  Title:Correlation analysis of aroma characters and volatiles in chardonnay dry white wines from five districts in China
  Authors:Tao, Yongsheng1 ; Peng, Chuantao1 
  Author affiliation:1  College of Enology, Northwest A and F University, Yangling, Shaanxi 712100, China
  Corresponding author:Tao, Y. (taoyongsheng@nwsuaf.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:130-139
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Chardonnay dry white wines from main wine producing districts in China were collected to analyze aroma quality and reveal the mathematic relations between aroma characters and volatiles. Sensory analysis was made by 30 panelists who were trained by using "Le Nez du Vin" wine aroma kit. The sensory data were composed of intensity and by using frequency of characters. SPME-GC-MS was used to identify and quantify aroma compounds in wine. PCA and correlation analysis of sensory data showed six typical aroma characters of the Chinese Chardonnay dry white wines: citric, pineapple, violet, lime, green apple and lemon. Odor active value (OAV) analysis indicated that 25 ones of 64 aroma compounds quantified in sample wines were impact odorants. Six regressive models of typical characters were built by aroma compounds to predict typical aroma intensity. Aroma quality and wine origin could also be estimated by the models. Five models have significance at 0.01 levels on ANOAV. Coefficients and constants of models are also significant at 0.01 level, and the correlation coefficients between the measured and predicted values (R2) are between 0.979 and 0.999. Chinese Chardonnay dry white wines from main producing districts have typical aroma characters. Aroma characters and volatile compounds have obvious relative relations, and some aroma compounds could be used to predict wine aroma characters.
  Number of references:24
  Main heading:Wine
  Controlled terms:Correlation methods  -  Fragrances  -  Regression analysis  -  Volatile organic compounds
  Uncontrolled terms:Aroma compounds  -  Aroma quality  -  Chardonnay  -  Correlation analysis  -  Correlation coefficient  -  Regression model  -  Sensory analysis  -  Sensory data  -  SPME-GC-MS  -  Volatile compounds   -  White wines  -  Wine aromas
  Classification code:451.1 Air Pollution Sources  -  822.3 Food Products  -  922.2 Mathematical Statistics
  DOI:10.6041/j.issn.1000-1298.2012.03.025
  Database:Compendex

24. Accession number:20121814987949
  Title:Centrifugal pumps surface meshing using a combined advancing-front and delaunay triangulation method
  Authors:Dong, Liang1 ; Liu, Houlin1 ; Tan, Minggao1 ; Wang, Kai1 ; Wang, Yong1 
  Author affiliation:1  Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
  Corresponding author:Dong, L. (edongliang@yahoo.com) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:62-66
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:With the aim to solve the problem of shape distortion when generating the finite element mesh of parametric surfaces, mapping method was used. But mapping method could generate distortion elements which lead to poor quality meshes easily. Based on the Riemannian metric, a combined advancing front technique (AFT) and Delaunay triangulation (DT) method were applied. In this algorithm, Riemannian metric was considered, and background grids of parametric space were generated by improved AFT. When background grids of parametric space were refined to counteract mapping distortion, the traditional Delaunay incremental insertion kernel was replaced by inserting the center of triangle circumscribed ellipse, and the algorithm for locating ellipse center and judging whether nodes within ellipse. The mapping distortion and algorithm efficiency were considered by the algorithm by introducing Riemannian metric and reasonable background mesh. Examples show that the new method is easy to implement. The mesh which has good stability and high quality can be generated.
  Number of references:11
  Main heading:Parameter estimation
  Controlled terms:Algorithms  -  Centrifugal pumps  -  Geometry  -  Triangulation
  Uncontrolled terms:Advancing front method  -  Advancing front technique  -  Algorithm efficiency  -  Delaunay  -  Delaunay triangulation  -  Delaunay triangulation method  -  Finite element meshes  -  Good stability  -  High quality  -  Incremental insertion   -  Mapping distortion  -  Mapping method  -  Parametric spaces  -  Parametric surfaces  -  Riemannian metrics  -  Shape distortions  -  Surface mesh generation  -  Surface meshing
  Classification code:405.3 Surveying  -  618.2 Pumps  -  731.1 Control Systems  -  921 Mathematics
  DOI:10.6041/j.issn.1000-1298.2012.03.012
  Database:Compendex

25. Accession number:20121814987971
  Title:Improved simulated annealing algorithm in optimal load distribution of multiple chillers for energy conservation
  Authors:Zhang, Jun1 ; Zhang, Kanyu1 ; Zhou, Qiang2 
  Author affiliation:1  School of Mechatronics Engineering and Automation, Shanghai University, Shanghai 200072, China
                   2  Shanghai Engineering Research Center of Controlled Environment Agriculture, Shanghai 201516, China
  Corresponding author:Zhang, J. (tshzhangjun@tsinghua.org.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:187-192
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The random search strategy was substituted by the chaotic traveling strategy in standard simulated annealing algorithm, variance evaluation criteria was appended as a condition to stop searching, a special method was adopted to determine the initial temperature in order to reduce redundant iterations, the improved stimulated annealing algorithm was applied to minimize the total power consumption of the multiple chiller water units which connected in parallel to achieve the purpose of energy saving. The mathematical model of the multiple chiller water units and the energy-saving methods by means of the improved simulated annealing were established. Both the theoretical analysis and the actual results indicated that the energy savings could be realized, and the total energy consumption of all the chillers was reduced by 4% to 11% compared with the usual load distribution strategy.
  Number of references:16
  Main heading:Simulated annealing
  Controlled terms:Chaos theory  -  Cooling systems  -  Energy conservation  -  Energy utilization  -  Environmental management  -  Mathematical models
  Uncontrolled terms:Chiller  -  Environmental control  -  Evaluation criteria  -  Improved simulated annealing algorithm  -  Load distribution strategies  -  Load distributions  -  Random searches  -  Simulated annealing algorithms  -  Stimulated annealing  -  Total energy consumption   -  Total power consumption
  Classification code:454.1 Environmental Engineering, General  -  525.2 Energy Conservation  -  525.3 Energy Utilization  -  641.2 Heat Transfer  -  921 Mathematics
  DOI:10.6041/j.issn.1000-1298.2012.03.034
  Database:Compendex

26. Accession number:20121814987946
  Title:Green land precision irrigation control system and analysis of optimal irrigation amount
  Authors:Zhao, Yandong1 ; Ma, Yangfei1 ; Wang, Yongzhi1 
  Author affiliation:1  School of Technology, Beijing Forestry University, Beijing 100083, China
  Corresponding author:Zhao, Y. (yandongzh@bjfu.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:46-50 56
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:With the aim to raise measure accuracy of double-depth measuring water content tactics in precision irrigation control system, by integration research of water content sensor, dual-layer composite soil water content sensor was worked out. Compared with the traditional two sensors' tactics, using dual-layer composite soil water content sensor, the measurement result can be more accurate, and energy consumption was reduced. In order to achieve optimal irrigation amount of green land plant, ensure the irrigation not be wasted and satisfy plant's normal need, the experiments were carried out by taking tall fescue for an example. On the basis of aggregately analyzing the tall fescue's growth requirement, soil water content and parts of meteorological dates, the result was gained, that is the optimal irrigation amount of tall fescue is 12 mm.
  Number of references:11
  Main heading:Irrigation
  Controlled terms:Control systems  -  Energy utilization  -  Nanocomposite films  -  Optimization  -  Plants (botany)  -  Sensors  -  Soil moisture
  Uncontrolled terms:Composite soils  -  Dual layer  -  Green land  -  Measure-accuracy  -  Measurement results  -  Optimal irrigation amount  -  Precision irrigation  -  Soil water content  -  Tall fescue
  Classification code:821.3 Agricultural Methods  -  801 Chemistry  -  731.1 Control Systems  -  921.5 Optimization Techniques  -  712.1 Semiconducting Materials  -  483.1 Soils and Soil Mechanics  -  461.9 Biology  -  525.3 Energy Utilization
  DOI:10.6041/j.issn.1000-1298.2012.03.009
  Database:Compendex

27. Accession number:20121814987969
  Title:Monitoring winter wheat percentage vegetation cover based on stationary wavelet transformation derived from hyperspectral reflectance
  Authors:Yao, Fuqi1 ; Cai, Huanjie1 ; Wang, Haijiang2 ; Zhang, Qian1 ; Wang, Jian1 
  Author affiliation:1  Key Laboratory of Agricultural Soil and Water Engineering in Arid Areas, Ministry of Education, Northwest A and F University, Yangling, Shaanxi 712100, China
                 2  Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China
  Corresponding author:Cai, H. (caihj@nwsuaf.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:173-180
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:By field trials, the canopy hyperspectral reflectance and percentage vegetation cover (PVC) for winter wheat during 2010 and 2011 growth periods were measured. The canopy spectral characteristic of different PVC and the relationship between canopy reflectance and PVC were analyzed in different growth periods. The winter wheat PVC estimation models based on normalized difference vegetation index (NDVI), ratio vegetation index (RVI), wavelet energy coefficients were established in different growth periods. The results showed that the spectral reflectance of winter wheat decreased in visible bands, however, increased in near infrared bands following the PVC increased. The spectral reflectance was negatively correlated with the PVC in visible bands, but the correlation coefficient turned to positive correlation near the red edge. The PVC estimation models based on NDVI was performed better at the regreening stage and elongation stage with determination of coefficient (R2) 0.8359 and 0.8057, respectively. However, the PVC estimation models based on RVI was better at the heading stage, filling stage with R2 0.8031 and 0.8294, respectively. R2 of the PVC estimation models based on high frequency energy coefficient and low frequency energy coefficient were 0.9112, 0.8954, 0.8802, and 0.9275 at the regreening stage, elongation stage, heading stage and filling stage, respectively.
  Number of references:19
  Main heading:Crops
  Controlled terms:Estimation  -  Reflection  -  Remote sensing  -  Space optics  -  Vegetation  -  Wavelet transforms
  Uncontrolled terms:Estimation models  -  Hyperspectral remote sensing  -  Stationary wavelet transforms  -  Vegetation cover  -  Winter wheat
  Classification code:921.3 Mathematical Transformations  -  921 Mathematics  -  821.4 Agricultural Products  -  821 Agricultural Equipment and Methods; Vegetation and Pest Control  -  741.1 Light/Optics  -  731.1 Control Systems  -  711 Electromagnetic Waves
  DOI:10.6041/j.issn.1000-1298.2012.03.032
  Database:Compendex

28. Accession number:20121814987957
  Title:Rapid quantitative determination of main components in dried distillers' grains by near-infrared spectroscopy
  Authors:Zhou, Xingfan1 ; Yang, Zengling1 ; Liu, Xian1 ; Huang, Guangqun1 ; Han, Lujia1  
Author affiliation:1  College of Engineering, China Agricultural University, Beijing 100083, China
  Corresponding author:Han, L. (hanlj@cau.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:103-107
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Dried distillers' grains were rich in nutrition, which used as protein feed materials, and could give some benefit to supplement feed deficit and reduce feed cost. Totally 78 dried distillers' grains samples were collected from 21 provinces of China. Crude fiber, crude ash and crude protein contents were detected in laboratory by standard methods. The statistic analysis showed that the distribution range of crude fiber, crude ash and crude protein contents were 1.60%~37.54%, 0.74%~26.85% and 12.01%~38.69%, respectively, the standard distribution value of them were 8.33%, 5.21% and 7.11%, respectively. The big differences in components content were mainly caused by the remaining rice hull during drying and separating process. Quantitative evaluation models were established to determinate crude fiber, crude ash and crude protein content of dried distillers' grains by NIRS methods. The results of NIRS analysis showed that this method could provide rapidly quantitative prediction for crude fiber, crude ash and crude protein contents in dried distillers' grains, the coefficient of determination in calibration were 0.98, 0.91 and 0.96, respectively; the standard error in calibration were 1.19%, 1.58% and 1.61%, respectively; the coefficient of determination in validation were 0.98, 0.92 and 0.96, respectively; the standard error in validation were 1.20%, 1.57% and 1.60%, respectively, and the ratio of performance to standard deviation were 7.38, 3.75 and 4.98, respectively. The prediction values of these models are accurate.
  Number of references:20
  Main heading:Grain (agricultural product)
  Controlled terms:Calibration  -  Fibers
  Uncontrolled terms:Coefficient of determination  -  Component contents  -  Crude fibers  -  Crude proteins  -  Feed materials  -  Near infrared reflectance spectroscopy  -  Quantitative determinations  -  Quantitative evaluation  -  Quantitative prediction  -  Rice hulls   -  Standard deviation  -  Standard distributions  -  Standard errors  -  Standard method  -  Statistic analysis
  Classification code:944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments  -  943 Mechanical and Miscellaneous Measuring Instruments  -  942 Electric and Electronic Measuring Instruments  -  941 Acoustical and Optical Measuring Instruments  -  821.4 Agricultural Products  -  817 Plastics and Other Polymers: Products and Applications  -  812 Ceramics, Refractories and Glass
  DOI:10.6041/j.issn.1000-1298.2012.03.020
  Database:Compendex

29. Accession number:20121814987961
  Title:Survey of acrylamide contents in Pu-erh tea and study on its formation mechanism
  Authors:Li, Lei1 ; Zhang, Tao2 ; Sun, Zhijian1 ; Chen, Fang1 ; Hu, Xiaosong1 
  Author affiliation:1  College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
                 2  College of Animal Science and Technology, China Agricultural University, Beijing 100094, China
  Corresponding author:Chen, F. (chenfangch@sina.com) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:123-129
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Fifty Pu-erh tea samples were investigated for acrylamide (AA) contents. The results showed that the AA contents in tea samples were generally low, 2.05~91.95 ng/g. Based on the correlation analysis between sugar contents and the amount of AA, it was found there was the highest correlation coefficient between the sucrose content and AA (R2=0.5776), followed by fructose (R2=0.4977), glucose was the least (R2=0.2567). The asparagine contents of wet-stored Pu-erh tea samples could not detected. In combination with literature records, it could be concluded that AA mainly generated through acrolein way during the fermentation of Pu-erh tea. There was a very small contribution of asparagine way.
  Number of references:17
  Main heading:Amides
  Controlled terms:Aldehydes  -  Amino acids  -  Fermentation  -  Glucose  -  Sugar (sucrose)
  Uncontrolled terms:Acrylamides  -  Correlation analysis  -  Correlation coefficient  -  Formation mechanism  -  Pu-erh tea  -  Sugar content  -  Tea samples
  Classification code:802.2 Chemical Reactions  -  804.1 Organic Compounds  -  822.3 Food Products
  DOI:10.6041/j.issn.1000-1298.2012.03.024
  Database:Compendex

30. Accession number:20121814987958
  Title:Comparison of modeling methods of fresh jujube soluble solids measurement by NIR spectroscopy
  Authors:Zhang, Shujuan1 ; Zhang, Haihong1 ; Zhao, Yanru1 ; Zhao, Huamin1 
  Author affiliation:1  College of Engineering, Shanxi Agricultural University, Taigu 030801, China
  Corresponding author:Zhang, S. (zsujuan@263.net) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:108-112
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Totally 180 samples coming from one orchard were divided into calibration set with 150 samples and prediction set with 30 samples. Field Spec3 spectrometer was used for collecting spectra data of 180 fresh jujube samples separately. Then successive projection algorithm and stepwise regression analysis combined with spectral theory were used to process the spectral data after MSC pretreatment. Characteristic wavelengths of 150 samples in calibration set were selected by using SPA and SRA, and the partial least square (PLS) and LS-SVM methods were used to establish models of the fresh jujube soluble solids with the whole spectrum and characteristic wavelengths selected by using SPA and SRA. At last, the models of MSC-PLS model, MSC-LS-SVM model, the MSC-SPA-PLS model, the MSC-SPA-LS-SVM model, the MSC-SRA-PLS model and the MSC-SRA-LS-SVM model were used to predict the soluble solids of 30 samples in the prediction set. The results showed that the correlation coefficient and the root mean square error of prediction of MSC-PLS model for full band are 0.8874 and 1.0889 and that is the best. The correlation coefficient and the root mean square error of prediction of MSC-SPA-PLS model and MSC-SRA-PLS model are 0.7990, 1.4078 and 0.8224, 1.3851, and they are less precise than the MSC-PLS model. The correlation coefficient and the root mean square error of prediction of MSC-SPA-LS-SVM model are 0.7963 and 1.1458, and that is more precise than the MSC-LS-SVM model. The precision of MSC-SRA-LS-SVM model is very low and is not suitable.
  Number of references:15
  Main heading:Mean square error
  Controlled terms:Calibration  -  Forecasting  -  Infrared devices  -  Near infrared spectroscopy
  Uncontrolled terms:Correlation coefficient  -  Fresh jujube  -  Full band  -  NIR spectroscopy  -  Nondestructive detection  -  Partial least square (PLS)  -  Pre-Treatment  -  Projection algorithms  -  Root-mean-square error of predictions  -  Soluble solids   -  Spectral data  -  Spectral theory  -  Stepwise regression analysis
  Classification code:944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments  -  943 Mechanical and Miscellaneous Measuring Instruments  -  942 Electric and Electronic Measuring Instruments  -  941 Acoustical and Optical Measuring Instruments  -  921 Mathematics  -  741.3 Optical Devices and Systems  -  731.1 Control Systems
  DOI:10.6041/j.issn.1000-1298.2012.03.021
  Database:Compendex

31. Accession number:20121814987960
  Title:Solubility and gelatin textural properties of inulin
  Authors:Luo, Denglin1 ; Xu, Wei1 ; Chen, Ruihong1 ; Liu, Jianxue1 ; Xu, Baocheng1 ; Chen, Hong1 
  Author affiliation:1  College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471003, China
  Corresponding author:Luo, D. (luodenglin@sohu.com) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:118-122 129
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The viscosity, swelling degree, water retention and gelatin textural properties of inulin were explored. When the inulin content was lower than 25%, the viscosity of aqueous solution was low and the increasing was not significant with the content increasing. However, with further increasing in the content, the viscosity increased rapidly. Temperature had significant effects on the swelling degree and the water retention, both of them had the same trend and reached the maximum value at 40°C. The gelling ability of inulin was evaluated by using gel index (VGI) and gelling time. The results showed that inulin could not gelatinize completely unless the content was no less than 35% and the gelling time became shorter as inulin content increased. TPA test showed that hardness, gel strength, adhesiveness, adhesive force and gumminess of gel were improved in the different extents as inulin content increased and storage time prolonged. Hardness, gel strength, adhesiveness and gumminess of gel were improved significantly when the inulin content was above 40%.
  Number of references:13
  Main heading:Polysaccharides
  Controlled terms:Gelation  -  Hardness  -  Solubility
  Uncontrolled terms:Adhesive force  -  Gel strengths  -  Gelatin  -  Gelling time  -  Inulin  -  Maximum values  -  Storage time  -  Swelling degree  -  Textural properties  -  Water retention   -  Water solubilities
  Classification code:421 Strength of Building Materials; Mechanical Properties  -  801.4 Physical Chemistry  -  802.3 Chemical Operations  -  804.1 Organic Compounds  -  951 Materials Science
  DOI:10.6041/j.issn.1000-1298.2012.03.023
  Database:Compendex

32. Accession number:20121814987944
  Title:Effects of growth of biofilm to emitters flow in emitter of reclaimed wastewater irrigation
  Authors:Li, Guibing1 ; Ren, Shumei1 ; Yang, Peiling1 ; Xu, Tingwu2 ; Li, Yunkai1 ; Yan, Dazhuang1 
  Author affiliation:1  College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, China
                 2  International College Beijing, China Agricultural University, Beijing 100083, China
  Corresponding author:Ren, S. (renshumei@126.com) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:33-38
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Wastewater irrigation test under biological swimming bed and biological filter was done to study biofilm growth situation in emitters. Results showed that biofilm growth experienced three periods of attachment period, growth period and maturity period, and biofilm was at a dynamic equilibrium state in maturity period. Biofilm was attached fast, growth fast and was the thickest on the inlet of emitters. Detached biofilm deposited on the inside flow or the outlet, which was embodied on the flow changes. The average flow changes of emitter lagged growth change of biofilom. When biofilm reached maturity period, it was detached repeatedly to grow, and this was high-risk period of emitter clogging when the average flow of emitter was declining. After 184 h, acid and chlorine can be added to flush emitter.
  Number of references:21
  Main heading:Biofilms
  Controlled terms:Biofiltration  -  Chlorine  -  Irrigation  -  Wastewater reclamation
  Uncontrolled terms:Biofilm growth  -  Biological filters  -  Clogging  -  Drip irrigation  -  Dynamic equilibrium state  -  Emitter  -  Emitter clogging  -  Flow changes  -  Growth period  -  Re-claimed water   -  Reclaimed wastewater  -  Wastewater irrigation
  Classification code:452 Municipal and Industrial Wastes; Waste Treatment and Disposal  -  452.4 Industrial Wastes Treatment and Disposal  -  462.5 Biomaterials (including synthetics)  -  804 Chemical Products Generally  -  821.3 Agricultural Methods
  DOI:10.6041/j.issn.1000-1298.2012.03.007
  Database:Compendex

33. Accession number:20121814987976
  Title:3-D surface quality evaluation based on graphics processing unit
  Authors:Cao, Yanlong1 ; Xu, Peng1 ; Jin, Lu1 ; Yang, Jiangxin1 
  Author affiliation:1  Institute of Modern Manufacturing Engineering, Zhejiang University, Hangzhou 310027, China
　Corresponding author:Cao, Y. (sdcaoyl@zju.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:219-222 229
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Aimed at achieving real-time evaluation on 3-D surface which is difficult due to the large number of surface information and high computational complexity, a GPU-based fast evaluation method was investigated. Rapid surface quality evaluation was realized by the GPU-based fast evaluation method developed by CUDA. The experimental results indicate that the method can significantly improve the calculation efficiency while ensuring the accuracy. It can meet the requirements of online assessment on 3-D surface quality.
  Number of references:7
  Main heading:Computer graphics equipment
  Controlled terms:Computer graphics  -  Program processors  -  Three dimensional
  Uncontrolled terms:3-D evaluation  -  3-D topography  -  Calculation efficiency  -  Evaluation Method  -  Graphics Processing Unit  -  On-line assessment  -  Quality evaluation  -  Surface information
  Classification code:722.2 Computer Peripheral Equipment  -  723.1 Computer Programming  -  723.5 Computer Applications
  DOI:10.6041/j.issn.1000-1298.2012.03.039
  Database:Compendex

34. Accession number:20121814987963
  Title:Optimization of the hot-air drying technical parameters for ginkgo fruit based on response surface methodolog
  Authors:Zhang, Lihua1, 2 ; Xu, Zhongming1 ; Xia, Lei2 ; Ma, Zhiyuan2 
  Author affiliation:1  College of Mechanical Engineering, Chongqing University, Chongqing 400044, China
                 2  College of Information and Engineering Technology, Sichuan Agricultural University, Yaan 625014, China
  Corresponding author:Xu, Z. (xuzm6@163.com) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:140-145 156
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The effects of drying temperature, material load and airflow rate on hot-air drying characteristics of the moisture content and dehydrating rate of ginkgo fruit were investigated by applying self-made hot-air drying online testing device. Drying temperature, material load and airflow rate were the influence factors, and moisture content, dehydration rate, average energy consumption of drying process, protein retention rate and sensory quality of dried ginkgo were the experimental indices, and the relationships between the experimental indices and the influence factors were analyzed through the responsesurface analysis method and sub-stepping method. The quadratic regression mathematical models that described the relations between the experimental indices and the influence factors were established. The optimal combination of technological parameters for drying materials was obtained through conducting a multi-objective function optimization by function expected optimization. The hot air drying process of ginkgo is mainly concentrated in constant-speed phase and decelerated phase, and the optimal parameters are as follows: hot-air temperature of 68°C, airflow rate of 1.15 m/s, and material load of 15.58 kg/m2. Under these conditions, the energy consumption is 11.86 kW·h/kg, the dehydration rate is 9.77%/h, protein retention rate is 90.30% and the sensory score is 8.57. The results can provide a theoretical basis for drying and industrialized production of ginkgo fruit.
  Number of references:12
  Main heading:Drying
  Controlled terms:Energy utilization  -  Fruits  -  Load testing  -  Mathematical models  -  Moisture determination  -  Multiobjective optimization  -  Surface properties
  Uncontrolled terms:Air flow-rate  -  Analysis method  -  Dehydration rates  -  Drying materials  -  Drying process  -  Drying temperature  -  Hot air  -  Hot air drying  -  Industrialized production  -  Material loads   -  Multi-objective functions  -  On-line testing  -  Optimal combination  -  Optimal parameter  -  Parameters optimization  -  Protein retention  -  Quadratic regression  -  Response surface  -  Response surface methodology  -  Sensory qualities   -  Sensory scores  -  Technological parameters  -  Theoretical basis
  Classification code:944.2 Moisture Measurements  -  921.5 Optimization Techniques  -  921 Mathematics  -  951 Materials Science  -  821.4 Agricultural Products  -  525.3 Energy Utilization  -  483.1 Soils and Soil Mechanics  -  642.1 Process Heating
  DOI:10.6041/j.issn.1000-1298.2012.03.026
  Database:Compendex

35. Accession number:20121814987956
  Title:Relationship between electrical properties and physiological characteristics of kiwifruit
  Authors:Tang, Yan1 ; Du, Guangyuan2 ; Zhang, Jishu1  
  Author affiliation:1  College of Life Science, Northwest A and F University, Yangling, Shaanxi 712100, China
                 2  College of Science, Northwest A and F University, Yangling, Shaanxi 712100, China
  Corresponding author:Zhang, J. (jishu@nwsuaf.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:97-102
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:The correlation between six electrical parameters such as impedance and twelve physiological parameters such as firmness of fruits were analyzed in order to study the relationship between electric properties and physiological properties of "Qinmei" kiwifruit stored at room temperature (20°C) and to explore the feasibility of nondestructive testing of physiological characteristics by using electric parameters. The results showed that Z can quantify eight physiological parameters such as firmness of fruits, Cp can quantify seven physiological parameters, inductance (Lp) can not quantify any physical parameters. The correlation between impedance angle (θ) and physical parameters (TA content, relative electrical conductivity, starch content, cellulose content and Xyl activity) was generally high at twenty-four frequencies, so it is reliable to use θ to quantize above physiological indexes. All physiological parameters can be quantified by sensitive electrical parameters except amylase activity, PE activity, PG activity and Cx activity.
  Number of references:12
  Main heading:Physiological models
  Controlled terms:Electric conductivity  -  Electric properties  -  Fruits  -  Nondestructive examination  -  Physiology
  Uncontrolled terms:Amylase activity  -  Cellulose content  -  Characteristic frequencies  -  Electric parameters  -  Electrical parameter  -  Kiwifruits  -  Physical parameters  -  Physiological characteristics  -  Physiological indices  -  Physiological parameters   -  Physiological properties  -  Relative electrical conductivities  -  Room temperature  -  Starch contents  -  Ta content
  Classification code:421 Strength of Building Materials; Mechanical Properties  -  461.1 Biomedical Engineering  -  461.9 Biology  -  701.1 Electricity: Basic Concepts and Phenomena  -  821.4 Agricultural Products
  DOI:10.6041/j.issn.1000-1298.2012.03.019
  Database:Compendex

36. Accession number:20121814987941
  Title:3-D simulation of combustion process in a diesel engine fueled with Jatropha curcas oil
  Authors:Wang, Ziyu1 ; Cheng, Xiuwei1 ; Liang, Yu2 ; Luo, Fuqiang3 
  Author affiliation:1  China North Engine Research Institute, Datong 037036, China
                 2  Department of Mechanical and Electronic Engineering, Guiyang University, Guiyang 550003, China
                 3  School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China
  Corresponding author:Wang, Z. (zealyouth2002@126.com) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:16-21
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:A 3-D combustion model considered the characteristics of Jatropha curcas oil was established, the combustion process of diesel engine fueled with Jatropha curcas oil was simulated. Simulation results of the cylinder pressure fitted well with the results of test. The flow field, temperature field, and mean temperature in cylinder were analyzed by the simulation. It is found that the injection timing is advanced when the engine fueled with Jatropha curcas oil. The timing of combustion is advanced, the peak premixed combustion is also advanced, and the combustion duration is longer than the engine fueled with diesel fuel.
  Number of references:17
  Main heading:Three dimensional
  Controlled terms:Combustion  -  Diesel engines  -  Diesel fuels  -  Three dimensional computer graphics
  Uncontrolled terms:3D simulations  -  Combustion duration  -  Combustion model  -  Combustion pro-cess  -  Cylinder pressures  -  Direct injection diesel engines  -  Injection timing  -  Jatropha curcas  -  Mean temperature  -  Premixed combustion
  Classification code:521.1 Fuel Combustion  -  612.2 Diesel Engines  -  723.5 Computer Applications  -  902.1 Engineering Graphics
  DOI:10.6041/j.issn.1000-1298.2012.03.004
  Database:Compendex

37. Accession number:20121814987973
  Title:Kinematic analysis for parallel mechanism of bionic-mobile robot
  Authors:Song, Mengjun1 ; Zhang, Minglu1  
  Author affiliation:1  School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China
  Corresponding author:Zhang, M. (zhangml@hebut.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:200-206
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Kinematics based on parallel mechanism of a new bionic-mobile robot with six legs were studied, and the method of coordinate transformation was used to construct kinematic model for parallel mechanism of the bionic-mobile robot; the geometrical relationship among the ends of different branches was applied to solve forward kinematics for the parallel mechanism, and the results of simulation indicate that construction of the kinematic model is right, solution of the forward kinematics is right; geometric modeling and numerical solution can be used to solve the inverse kinematics for parallel mechanism of the bionic-mobile robot and the existences of inverse kinematics for the parallel mechanism was testified.
  Number of references:11
  Main heading:Mechanisms
  Controlled terms:Bionics  -  Inverse kinematics  -  Kinematics  -  Mobile robots
  Uncontrolled terms:Bionic robot  -  Co-ordinate transformation  -  Forward kinematics  -  Geometric modeling  -  Geometrical relationship  -  Kinematic Analysis  -  Kinematic model  -  Numerical solution  -  Parallel mechanisms
  Classification code:601.3 Mechanisms  -  731.1 Control Systems  -  731.5 Robotics  -  931.1 Mechanics
  DOI:10.6041/j.issn.1000-1298.2012.03.036
  Database:Compendex

38. Accession number:20121814987968
  Title:Corn haploid grain feature extraction and recognition
  Authors:Song, Peng1 ; Wu, Kebin1 ; Zhang, Junxiong1 ; Chen, Shaojiang2 ; Liu, Jin2 ; Li, Wei1
  Author affiliation:1  College of Engineering, China Agricultural University, Beijing 100083, China
                2  National Maize Improvement Center, China Agricultural University, Beijing 100193, China
  Corresponding author:Li, W. (liww@cau.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:168-172
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:A feature extraction and identification method of corn haploid and hybrid kernels was studied. The corn kernels were produced by hybrid induction after importing gene markers to their male parent in corn haploid breeding process. The proposed method made the accurate identification of corn haploid kernels come true. Corn kernels produced by hybrid induction was researched. Firstly, the corn kernels were divided into three parts according to the color distribution, including purple marks, yellow endosperm and white embryo. Then a (G-B)R/B model was proposed by analyzing color features of pixel samples that got from the three parts. This model could extract the purple marks area effectively. A simple and quick identification method of corn haploid kernels was proposed after researching on morphological characteristics of corn kernels and distribution characteristics of purple marks. Experiments finished in the corn haploid sorting platform, they showed the accurate rate of corn haploid identification was above 98.07% by the proposed method, and it met the requirements of dynamic test.
  Number of references:12
  Main heading:Feature extraction
  Controlled terms:Color  -  Genes  -  Image processing
  Uncontrolled terms:Color features  -  Corn  -  Genetic markers  -  Haploid  -  Recognition
  Classification code:461.2 Biological Materials and Tissue Engineering  -  741 Light, Optics and Optical Devices  -  741.1 Light/Optics
  DOI:10.6041/j.issn.1000-1298.2012.03.031
  Database:Compendex

39. Accession number:20121814987965
  Title:Fruit trees 3-D information perception and reconstruction based on binocular stereo vision
  Authors:Cai, Jianrong1 ; Sun, Haibo1 ; Li, Yongping2 ; Sun, Li1 ; Lu, Huazhu1 
  Author affiliation:1  School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
                  2  School of Electronic and Information, Ningbo Dahongying University, Ningbo 315175, China
  Corresponding author:Cai, J. (jrcai@ujs.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:152-156
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:In order to avoid obstacles for fruit harvesting robot, the method of spatial information extraction of tree branch was studied. The method of normalized cross-correlation was used to get the disparity map of stereo image, branch skeleton was extracted and feature points were extracted by multi-segment approximation method. The spatial coordinates of branch feature points were calculated by combining with the disparity map based on binocular stereo vision, the radius of branch feature points were calculated by using the branch range image, in the end, the forked branch was divided into separate section. Rapid model reconstruction for fruit tree was researched: firstly, each branch module was constructed by 12-prism in the coordinate origin; then, every module was set to the correct posture by affine transformation; finally, the complete fruit tree model was restructured. Experiments show that the virtual trees provide the actual environment reference for obstacle avoidance and path planning of fruit picking machine.
  Number of references:15
  Main heading:Three dimensional
  Controlled terms:Approximation theory  -  Binocular vision  -  Forestry  -  Motion planning  -  Orchards
  Uncontrolled terms:3D information  -  Actual environments  -  Affine transformations  -  Approximation methods  -  Avoid obstacles  -  Binocular stereo vision  -  Disparity map  -  Fruit harvesting  -  Fruit trees  -  Model reconstruction   -  Multi-segment  -  Normalized cross-correlation  -  Range images  -  Spatial coordinates  -  Spatial information extraction  -  Stereo-image  -  Tree branches  -  Virtual tree
  Classification code:731.5 Robotics  -  741.2 Vision  -  821.0 Woodlands and Forestry  -  821.3 Agricultural Methods  -  902.1 Engineering Graphics  -  921.6 Numerical Methods
  DOI:10.6041/j.issn.1000-1298.2012.03.028
  Database:Compendex

40. Accession number:20121814987977
  Title:Technology of magnesium alloy car's wheel hub on spinning shaping
  Authors:Ma, Chunsheng1 ; Zhang, Zhimin2 ; Guo, Yuming3 
  Author affiliation:1  College of Mechanical Engineering and Automation, North University of China, Taiyuan 030051, China
                 2  College of Materials Science and Engineering, North University of China, Taiyuan 030051, China
                 3  College of Engineering, Shanxi Agricultural University, Taigu 030801, China
  Corresponding author:Zhang, Z. (rivermcs@163.com) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:223-229
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:Take magnesium alloy car's wheel hub as the investigated subject, and based on the advanced technology of magnesium alloy car's isothermal spinning shaping, the equipment of spinning shaping was developed. The continuous and partial plastic deformation process of wheel hub radials were numerically simulated through finite element method, and deformation regulations were also analyzed and process parameters were optimized by orthogonal tests. The results of the experiments showed that this new technology significantly increased the size of continuous deformation zone, made deformation paths reasonable, and greatly improved shaping efficiency and machining accuracy.
  Number of references:11
  Main heading:Wheels
  Controlled terms:Deformation  -  Finite element method  -  Magnesium alloys  -  Optimization  -  Vehicles
  Uncontrolled terms:Advanced technology  -  Deformation path  -  Deformation zone  -  Machining Accuracy  -  Magnesium alloy wheels  -  Optimize of parameter  -  Orthogonal test  -  Process parameters
  Classification code:921.6 Numerical Methods  -  921.5 Optimization Techniques  -  601.2 Machine Components  -  542.2 Magnesium and Alloys  -  432 Highway Transportation  -  422 Strength of Building Materials; Test Equipment and Methods  -  421 Strength of Building Materials; Mechanical Properties
  DOI:10.6041/j.issn.1000-1298.2012.03.040
  Database:Compendex

41. Accession number:20121814987970
  Title:Realization of light quality adjustable precise light compensating method in greenhouse agriculture
  Authors:Zhang, Haihui1 ; Hu, Jin1 ; Yang, Qing1 ; Dai, Jianguo1 ; Zhao, Bin1 ; Tian, Wei1 
  Author affiliation:1  College of Mechanical and Electronic Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
  Corresponding author:Yang, Q. (yangtin@nwsuaf.edu.cn) 
  Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
  Abbreviated source title:Nongye Jixie Xuebao
  Volume:43
  Issue:3
  Issue date:March 2012
  Publication year:2012
  Pages:181-186
  Language:Chinese
  ISSN:10001298
  CODEN:NUYCA3
  Document type:Journal article (JA)
  Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
  Abstract:A precise light compensating method integrated with real-time environmental monitoring, specific wavelength light complementing and quantitative decision-making was proposed. Based on feedback control mechanism, a quantitative decision-making algorithm was put forward. Using a single chip as the central control unit, the light complementing value was accurately calculated based on the environmental temperature and the difference between target and real-time values of light intensity of red and blue light. Light intensity output of LED was adjusted by PWM duty cycle to meet the demand of light complementing. Experimental results show that the system has achieved quantitative multi-waveband light complementing. And it realized the energy saving of 54% and 83% respectively to filament lamp and fluorescent. With the same LED, the system has an average energy saving ability of 30% or more compared to the existed LED light compensating system, and the energy saving rate fluctuated at different light quality thresholds and environment conditions.
  Number of references:13
  Main heading:Light emitting diodes
  Controlled terms:Agriculture  -  Decision making  -  Energy conservation  -  Greenhouses
  Uncontrolled terms:Average energy  -  Central control  -  Compensating method  -  Control mechanism  -  Decision-making algorithms  -  Duty cycles  -  Environment conditions  -  Environmental Monitoring  -  Environmental temperature  -  LED lights   -  Light intensity  -  Light quality  -  Multi-wavebands  -  Precise light compensating  -  Red and blue light  -  Single chips
  Classification code:525.2 Energy Conservation  -  741.1 Light/Optics  -  821 Agricultural Equipment and Methods; Vegetation and Pest Control  -  821.6 Farm Buildings and Other Structures  -  912.2 Management
  DOI:10.6041/j.issn.1000-1298.2012.03.033
  Database:Compendex