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  2010年第41卷第11期共收录44篇
1. Accession number: 20105213523701
 Title: Effects of O3 on lignification and related enzyme activity in bamboo shoots
 Authors: Luo, Zisheng1 ; Zhang, Li1
Author affiliation: 1 College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310029, China
 Corresponding author: Luo, Z. (luozisheng@zju.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 115-118
 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 determine the effectiveness of O3 on lignification of bamboo shoot (Phyllostachys pubescens Mazel), the bamboo shoots were exposed to either 100 μL/L, 200 μL/L or 300 μL/L for 30 min before stored at (1±1)°C for 30d. The effect of O3 treatment on lignification and related enzyme activity were investigated. The results indicated that O3 treatment inhibited firmness from increasing, while decreasing the respiration rate and ethylene production. O3 treatment also retarded the activities of phenylalanine ammonia lyase (PAL), peroxidase (POD) and polyphenol oxidase (PPO) increasing. The cellulose and lignin content were 8%-14% and 7%-12% lower than that of control, and the dacay rate was 71%-84% lower than that of control. Therefore, O3 treatment has potential use in delaying lignification of bamboo shoot.
 Number of references: 13
 Main heading: Bamboo
 Controlled terms: Amino acids  -  Enzyme activity  -  Enzymes  -  Ethylene
Uncontrolled terms: Dacay rate  -  Ethylene production  -  Lignification  -  Lignin contents  -  O3  -  Phenylalanine ammonia-lyase  -  Polyphenol oxidase  -  Pubescens  -  Respiration rate
Classification code: 461.9 Biology  -  804.1 Organic Compounds  -  821.4 Agricultural Products
 DOI: 10.3969/j.issn.1000-1298.2010.11.022
 Database: Compendex
   
2. Accession number: 20105213523723
 Title: Description of serrated chip deformation and its morphology evolution
 Authors: Su, Guosheng1 ; Liu, Zhanqiang1 ; Du, Jin1 ; Yang, Qibiao1
Author affiliation: 1 School of Mechanical Engineering, Shandong University, Ji'nan 250061, China
 Corresponding author: Liu, Z. (melius@sdu.edu.cn)
Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 223-227
 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 model of chip formation for high-speed machining was proposed. A serial of parameters were built to assess the deformation of the chip segment. Turning experiments were carried out on a kind of high-strength steel, AerMet100, to validate the model. A further discussions were made on the experimental results on which a model of chip formation at different cutting speeds was developed. The mechanisms of chip deformation at the different cutting speeds were studied qualitatively. It was found that with the increase of cutting speed, the material dynamic yield strength, tensile strength would be strengthened and the influence of thermal softening effect, strain hardening effect would be weakened, which could decidedly lead to the onset of serrated chip.
 Number of references: 16
 Main heading: Tensile strength
Controlled terms: Deformation  -  High strength steel  -  Machining  -  Roads and streets  -  Speed  -  Strain hardening
Uncontrolled terms: Chip deformation  -  Chip formations  -  Cutting speed  -  Dynamic strength  -  Dynamic yield  -  High speed machining  -  High-strength steels  -  Morphology evolution  -  Serrated chip  -  Strain hardening effects   -  Thermal softening  -  Turning experiments
Classification code: 931.1 Mechanics  -  604.2 Machining Operations  -  545.3 Steel  -  537.1 Heat Treatment Processes  -  422 Strength of Building Materials; Test Equipment and Methods  -  421 Strength of Building Materials; Mechanical Properties  -  406.2 Roads and Streets
 DOI: 10.3969/j.issn.1000-1298.2010.11.044
 Database:  Compendex

3. Accession number: 20105213523718
Title: Conversion method from cartesian space trajectory to joint trajectory of spray painting robot
 Authors: Li, Fazhong1 ; Zhao, Dean1 ; Ji, Wei1 ; Zhang, Chao1 ; Zhu, Yi1
Author affiliation: 1  School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
 Corresponding author: Li, F. (andy007@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 198-201
 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 conversion method from cartesian space trajectory to joint trajectory of spray painting robot based on Dijkstra algorithm was presented to meet the requirements of offline programming spray painting robot and characteristics of spray cartesian space trajectory. Through analyzing the relations between the part coordinates and the robot basal coordinates, the spray cartesian space trajectory was converted to the robot basal coordinates by three points calibration of auxiliary feature points. An optimized model was established to obtain the shortest joint motion distance in robot inverse kinematics solutions. The distance between all of the inverse kinematics solutions was described by a directed weighted graph, and the Dijkstra algorithm was employed to obtain the optimal combination of inverse kinematics solution. Finally, the feasibility and efficiency of the method were verified by spray experiment.
 Number of references: 10
 Main heading: Trajectories
Controlled terms: Algorithms  -  Inverse kinematics  -  Optimization  -  Robot programming  -  Robots  -  Space flight
Uncontrolled terms: Cartesian Space  -  Conversion methods  -  Dijkstra algorithms  -  Feature point  -  Inverse kinematics solutions  -  Joint motion  -  Joint trajectories  -  Off line programming  -  Optimal combination  -  Part coordinates   -  Robot inverse kinematics  -  Spray painting  -  Weighted graph
Classification code: 921.5 Optimization Techniques  -  921 Mathematics  -  731.5 Robotics  -  931.1 Mechanics  -  723.1 Computer Programming  -  656.1 Space Flight  -  404.1 Military Engineering  -  723 Computer Software, Data Handling and Applications
 DOI: 10.3969/j.issn.1000-1298.2010.11.039
 Database: Compendex

4. Accession number: 20105213523682
Title: Combustion estimation based on vibration acceleration signal from start of combustion to peak pressure appearance timing
 Authors: Ji, Shaobo1 ; Cheng, Yong1 ; Tang, Juan1 ; Ma, Zongzheng1 ; Huang, Wanyou1
Author affiliation: 1  School of Energy and Power Engineering, Shandong University, Ji'nan 250061, China
 Corresponding author: Cheng, Y. (cysgd@sdu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 13-19 30
 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:  There is close connection between vibration signal and combustion status before peak pressure. Comparison was carried out among the vibration acceleration signal, cylinder pressure, rate of pressure rise and pressure rise acceleration before peak pressure. Based on the similar trend waveform, a novel method using inflection of vibration acceleration to estimate combustion process feature points was proposed. Contrast was also carried out among cylinder pressure, rate of pressure rise, time domain waveform and frequency component amplitude of vibration acceleration and pressure rise acceleration. Results showed that the maximum time domain fluctuation and frequency component amplitude of vibration acceleration are closely related with combustion status and the information can be used as characteristic parameters to reflect combustion status. Experiments were carried out and the result verified that the characteristic parameters were feasible.
 Number of references: 9
 Main heading: Acceleration
Controlled terms: Combustion  -  Diesel engines  -  Engine cylinders  -  Time domain analysis
Uncontrolled terms: Characteristic parameter  -  Combustion pro-cess  -  Cylinder combustion status  -  Cylinder pressures  -  Feature point  -  Frequency components  -  Novel methods  -  Peak pressure  -  Pressure rise  -  Rate of pressure   -  Start of combustion  -  Time domain  -  Time-domain waveforms  -  Vibration acceleration  -  Vibration signal  -  Wave forms
Classification code: 521.1 Fuel Combustion  -  612.1.1 Internal Combustion Engine Components  -  612.2 Diesel Engines  -  921 Mathematics  -  931.1 Mechanics
 DOI: 10.3969/j.issn.1000-1298.2010.11.003
 Database: Compendex

5. Accession number: 20105213523680
Title: Investigation of the influences of droplet viscosity and environmental pressure on the spray collision
 Authors: Cheng, Chuansong1 ; Li, Yunqing1 ; Li, Yikai1 ; Zhao, Lifeng1
Author affiliation: 1 Academy of Transportation Science and Engineering, Beihang University, Beijing 100191, China
 Corresponding author: Cheng, C. (cheng_auto13@ae.buaa.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 1-7 37
 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 stretching separation and coalescence are only considered in the O'Rourke model while the bounce, reflexive separation and the secondary breakup under high Weber collision are ignored. Furthermore, the influences of droplet property and collision condition on the collision regimes are not included in the O'Rourke model so that the predicted critical Weber numbers are underestimated. In the composite collision model, the collision regimes were revised to consider the influence of droplet viscosity and environmental pressure, and the bounce, coalescence, reflexive separation, stretching separation and the secondary breakup under high Weber collision were also considered. Moreover, the influences of droplet viscosity and environmental pressure on the spray collision were investigated based on the composite collision model. The results showed that the probability of bounce was increased due to the increasing of environmental pressure while the probability of coalescence was decreased. However, the probability of coalescence was increased with the increasing of droplet viscosity while the probability of collision separation was reduced.
 Number of references: 20
 Main heading: Drop breakup
Controlled terms: Coalescence  -  Combustion  -  Computer simulation  -  Drop formation  -  Electric conductivity of solids  -  Engines  -  Internal combustion engines  -  Probability  -  Viscosity
Uncontrolled terms: Collision model  -  Droplet viscosity  -  Environmental pressures  -  Internal combustion  -  Spray simulation
Classification code: 931.2 Physical Properties of Gases, Liquids and Solids  -  922.1 Probability Theory  -  801.3 Colloid Chemistry  -  723.5 Computer Applications  -  612.1 Internal Combustion Engines, General  -  612 Engines  -  521.1 Fuel Combustion
DOI: 10.3969/j.issn.1000-1298.2010.11.001
 Database: Compendex

6. Accession number: 20105213523721
 Title: Modeling and analysis of machine tool feed servo systems with friction and backlash
 Authors: Liu, Lilan1 ; Liu, Hongzhao1 ; Wu, Ziying1 ; Zhang, Minghong1
Author affiliation: 1 School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, China
 Corresponding author: Liu, L. (liulilans@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 212-218
 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:  The performance of the feed servo system has an important effect on CNC machine tools, including the tracking and position accuracy as well as the surface quality of the machined part. The nonlinear factors such as friction and backlash can induce unstable behaviors such as stick-slip and oscillation of the feed servo system. The mechanical and mathematical models containing friction and backlash were established for the motor direct-connected feed servo system with close loop controller. The effects of friction and backlash on the worktable under low feeding velocity were studied. A few of possible conditions for the stick-slip occurrence of the worktable were obtained. And some means for cancelling the stick-slip behavior of the feed servo system were presented at last. The research results provided a theoretical support for the optimum design and performance forecast of the feed servo system.
 Number of references: 9
 Main heading: Friction
Controlled terms: Computer control systems  -  Machine tools  -  Mathematical models  -  Slip forming  -  Tribology
Uncontrolled terms: Backlash  -  Close loop  -  CNC machine tools  -  Modeling and analysis  -  Nonlinear factors  -  Optimum designs  -  Position accuracy  -  Research results  -  Servo system  -  Stick-slip   -  Stick-slip behavior  -  Surface qualities  -  Unstable behavior
Classification code: 412 Concrete  -  603.1 Machine Tools, General  -  731.1 Control Systems  -  921 Mathematics  -  931 Classical Physics; Quantum Theory; Relativity  -  931.1 Mechanics
 DOI: 10.3969/j.issn.1000-1298.2010.11.042
 Database: Compendex

7. Accession number: 20105213523708
Title: Autonomous navigation system for agricultural tractor based on self-adapted fuzzy control
Authors: Liu, Zhaoxiang1 ; Liu, Gang1 ; Ji, Ying1, 2 ; Zhang, Man1 ; Meng, Zhijun3 ; Fu, Weiqiang3
Author affiliation: 1   Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University,   Beijing 100083, China
2   College of Information and Science and Technology, Agricultural University of Hebei, Baoding 071000, China
3   National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China
 Corresponding author: Liu, G. (pac@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 148-152 162
 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: An autonomous navigation system based on self-adapted fuzzy control for agricultural tractor was proposed. PLC, electro-hydraulic switch valve and proportional directional control valves were used to construct the automatic steering control system based on PD control algorithm. A self-adapted fuzzy control algorithm was proposed, GA was adopted to optimize the fuzzy rules and proportion factor of fuzzy output online. It retained the advantages of conventional fuzzy control, and meanwhile, it improved the performance of autonomous navigation control system. Simulation and field experiment indicated that the proposed navigation control algorithm could eliminate the tracking error effectively with rapid response and small overshoot, the navigation system worked stably, the maximum tracking error was less than 10 cm.
 Number of references: 13
 Main heading: Genetic algorithms
Controlled terms: Control systems  -  Fuzzy control  -  Navigation  -  Navigation systems  -  Remote control  -  Tractors (agricultural)  -  Tractors (truck)  -  Valves (mechanical)
Uncontrolled terms: Agricultural tractors  -  Automatic steering control  -  Autonomous navigation  -  Autonomous navigation systems  -  Directional control valve  -  Electro-hydraulics  -  Field experiment  -  Fuzzy control algorithms  -  Fuzzy output  -  Navigation controls   -  PD control  -  Proportion factor  -  Rapid response  -  Self-adapted control  -  Small overshoot  -  Tracking errors  -  Tractor
Classification code: 731.1 Control Systems  -  731 Automatic Control Principles and Applications  -  723 Computer Software, Data Handling and Applications  -  921 Mathematics  -  716.3 Radio Systems and Equipment  -  601.2 Machine Components  -  434.4 Waterway Navigation  -  663.1 Heavy Duty Motor Vehicles
 DOI: 10.3969/j.issn.1000-1298.2010.11.029
 Database: Compendex

8. Accession number: 20105213523717
 Title: Load-stroke model for straightening the warpage of T-rail
 Authors: Zhou, Lei1 ; Yu, Zhonghua1
Author affiliation: 1  Institute of Modern Manufacturing Engineering, Zhejiang University, Hangzhou 310027, China
 Corresponding author: Zhou, L. (zhouleidr@gmail.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 193-197 207
 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: Three deformation stages of straightening T-rail's warpage, including elastic deformation, elastic-plastic deformation and elastic unloading springback, were analyzed according to the elastic-plastic mechanics theory, the load-stroke expressions of three deformation stages were gained through deriving relationships among load, bending moment and stroke, and then the straightening load-stroke model was established. By using the model, the straightening stroke could be calculated directly and accurately according to the initial deflection. In order to verify the model presented, taking T89/B guide rail for example, the straightening experiment was conducted. Comparing the calculation strokes by model with experimental results, the relative errors are less than 10%. It showed the presented model was practical. It will give theoretical support to the development of automatic machines for T-rail's warpage straightening.
 Number of references: 11
 Main heading: Bending (deformation)
 Controlled terms: Elastic deformation  -  Elastoplasticity  -  Unloading
Uncontrolled terms: Automatic machines  -  Deformation stages  -  Elastic-Plastic  -  Elastic-plastic deformation  -  Guide rail  -  Initial deflection  -  Load  -  Load-stroke model  -  Relative errors  -  Spring-back   -  Stroke  -  T-rail  -  Warpages
Classification code: 421 Strength of Building Materials; Mechanical Properties  -  674.1 Small Marine Craft  -  818 Rubber and Elastomers
 DOI: 10.3969/j.issn.1000-1298.2010.11.038
 Database: Compendex

9. Accession number: 20105213523697
 Title: Analysis of fixed-bed biomass gasifier cold internal pressure field based on Fluent
 Authors: Sun, Hongyu1 ; Dong, Yuping1 ; Zhou, Shuxia1 ; Dong, Lei2 ; Jing, Yuanzhuo2
Author affiliation: 1  Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, Shandong University, Ji'nan 250061, China
                   2  Ji'nan Baichuan Tongchuang 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: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 94-97 104
 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: Taking the physical model of downdraft biomass gasifier as the research object, fluid simulation software Fluent was used, the pressure field of the gasifier that in the condition of single-layer air-distribution and double-layer air-distribution was comparatively analyzed. By means of multi-point pressure measurement experiment, the simulation results were verified. The Euler-Lagrange model was used to analyze the cold characteristics flow field distribution of gasification. The reason of diversification in pressure field by Bernoulli's equation was discussed. The results showed that the deviation value of simulation and experimental results was under 2.5%. Different air-distribution condition should lead to the changes of flow field in biomass gasifier. Double-layer air-distribution condition made the average pressure in oxidation area of 14.98 kPa, higher than that in the condition of single air-distribution. And also the axial direction pressure distributed equally.
 Number of references: 12
 Main heading: Gasification
Controlled terms:  Air  -  Biomass  -  Computer simulation  -  Computer software  -  Flow fields
Uncontrolled terms: Air distribution  -  Average pressures  -  Axial direction  -  Bernoulli's equations  -  Biomass Gasification  -  Biomass gasifier  -  Double layers  -  Euler-lagrange models  -  Fixed-bed  -  Flow field distribution   -  Fluid simulations  -  Gasification pressure  -  Gasifiers  -  Internal Pressure  -  Measurement experiments  -  Numerical simulation  -  Physical model  -  Pressure field  -  Research object  -  Simulation result   -  Single layer
Classification code:  525.1 Energy Resources and Renewable Energy Issues  -  631.1 Fluid Flow, General  -  723 Computer Software, Data Handling and Applications  -  723.5 Computer Applications  -  802.3 Chemical Operations  -  804 Chemical Products Generally
 DOI: 10.3969/j.issn.1000-1298.2010.11.018
 Database: Compendex

10. Accession number: 20105213523700
Title: Effects of sesame protein isolate on DSC of curd and microstructural properties of cheese milk
Authors: Lu, Xiaoming1 ; Zuo, Fanglei1 ; Guo, Huiyuan1 ; Ren, Fazheng1 ; Chen, Shangwu1
Author affiliation: 1 College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
 Corresponding author: Chen, S. (swchen@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 110-114 83
 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: To study the influence of sesame protein isolate on cheese system, the characteristics of microstructure and thermal properties of cheese contained sesame protein isolate were investigated. Cheeses made from mixture milk with 0, 4%, 8%, 12% protein substituted by sesame protein isolates in total milk protein were prepared. Adding sesame protein isolate in cow milk resulted fat globular smaller and more regular, showed the emulsifying and homogeneous properties of sesame protein isolate. DSC analysis showed the thermodynamic properties were influenced by sesame protein isolate, one new absorption peak was detected and the peak temperature varied with sesame protein isolate content. The interact mode of sesame protein isolate and casein based on the present results were discussed and the research results were published.
 Number of references: 22
 Main heading: Proteins
  Controlled terms: Emulsification  -  Microstructure  -  Thermodynamic properties
Uncontrolled terms: Absorption peaks  -  Cheese  -  Cheese milk  -  Cow milk  -  Differential scanning calorimety  -  Microstructural properties  -  Milk protein  -  Peak temperatures  -  Protein isolates  -  Research results   -  Sesame protein isolate  -  Thermal properties
Classification code: 641.1 Thermodynamics  -  802.3 Chemical Operations  -  804.1 Organic Compounds  -  933 Solid State Physics  -  951 Materials Science
 DOI: 10.3969/j.issn.1000-1298.2010.11.021
 Database: Compendex

11. Accession number: 20105213523719
Title: Effects of longitudinal surface roughness on the lubricating performance of starved roller EHL contacts
 Authors: Liu, Xiaoling1 ; Yang, Peiran1
Author affiliation: 1 School of Mechanical Engineering, Qingdao Technological University, Qingdao 266033, China
 Corresponding author: Liu, X. (lxl@qtech.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 202-207
 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: Numerical solution for the roller elastohydrodynamic lubrication (EHL) contacts with longitudinal surface roughness under fully flooded and starved conditions was obtained. The results showed that the lubricating performance in the middle and the end parts of the roller was different. Owing to the side leakage effect, the film thickness at the end parts of the roller was much lower than that in the middle part of the roller. Oscillations of the film thickness and pressure could be caused by the surface roughness. Under pure rolling condition, the wavelength of the film oscillation equaled the wavelength of the surface roughness, while the amplitude was larger than that of the roughness. Surface roughness could reduce the film thickness, especially for the starved EHL contacts. The smaller the thickness of the oil supply layer was, the easier the starvation in the roller contact could be. In addition, when the oil supply quantity is specified, larger amplitude and smaller wavelength are more harmful to the lubricating performance of the roller contacts.
 Number of references: 8
 Main heading: Surface roughness
Controlled terms: Elastohydrodynamic lubrication  -  Metal analysis  -  Rollers (machine components)  -  Rolling  -  Surface properties
Uncontrolled terms: Leakage effects  -  Lubricating performance  -  Numerical solution  -  Oil supplies  -  Pure rolling  -  Roller contacts  -  Roughness  -  Starvation  -  Starved conditions
Classification code: 531 Metallurgy and Metallography  -  535.1 Metal Rolling  -  601.2 Machine Components  -  607.2 Lubrication  -  801 Chemistry  -  931.2 Physical Properties of Gases, Liquids and Solids
 DOI:10.3969/j.issn.1000-1298.2010.11.040
 Database: Compendex

12. Accession number: 20105213523709
Title: Automatic image inpainting algorithm for apple harvesting robot's vision system based on LBM
 Authors: Chen, Yu1 ; Zhao, Dean1
Author affiliation: 1 School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
 Corresponding author: Chen, Y. (chenyu@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 153-157 162
 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: With the aim to recover the lost information of the apple harvesting robot's vision caused by the branches and leaves, an automatic image inpainting algorithm was proposed. By calculating the so called blocked factor, the area blocked by the branches and leaves was confirmed at first. And then, a Lattice Boltzmann method based on image inpainting algorithm (LBMII) was used to recover the lost information. The examination results show that the LBMII can recover the apple image effectively, and has higher PNSR than the algorithm based on the curvature-driven diffusions. More over, the parallism of the LBMII can be used to build the high speed parallel image processing system for apple harvesting robot.
 Number of references: 14
 Main heading: Computer vision
Controlled terms: Algorithms  -  Drop formation  -  Fruits  -  Harvesting  - Recovery  -  Robots
Uncontrolled terms: Apple  -  Driven diffusion  -  Harvesting robot  -  High speed  -  Image Inpainting  -  Lattice-Boltzmann method  -  Parallel image processing  -  Vision systems
Classification code: 921 Mathematics  -  821.4 Agricultural Products  -  821.3 Agricultural Methods  -  931.2 Physical Properties of Gases, Liquids and Solids  -  731.5 Robotics  -  723 Computer Software, Data Handling and Applications  -  531 Metallurgy and Metallography  -  723.5 Computer Applications
 DOI: 10.3969/j.issn.1000-1298.2010.11.030
 Database: Compendex

13. Accession number: 20105213523722
 Title: Mesh searching algorithm for calculating conicity error
 Authors: Lei, Xianqing1 ; Wei, Fangxia1 ; Xue, Yujun1 ; Li, Jishun2 ; Duan, Mingde1
Author affiliation: 1    School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang 471003, China
2   Henan Key Laboratory of Modern Mechanical Design and Transmission System, Luoyang 471003, China
 Corresponding author: Lei, X. (ly-lxq@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 219-222
 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 view of searching the ideal cone axis for error evaluation of the conicity, a new kind of algorithm of evaluating conicity error, named as mesh searching algorithm, and the mathematical model of conicity error were presented. The algorithm has three steps. Firstly, a certain length square was collocated around the centre of least square circle on the initial section and terminal section. Secondly, a series of mesh points on the initial section and terminal section could be obtained by dividing the certain length square. And a series of lines could be obtained by connecting each mesh point on the initial section to the each mesh point on terminal section. Thirdly, a series of lines were regarded as theoretical cone axis, then the minimum zone conicity error could be calculated according to the definition of conicity error. The principle of the method and the steps of using the mesh searching algorithm to solve the conicity error were described in detail. Results of the calculation example revealed that the conicity error could be evaluated effectively and accurately by using the mesh searching algorithm.
 Number of references: 7
 Main heading: Algorithms
 Controlled terms: Mathematical models
Uncontrolled terms: Conicity  -  Error evaluation  -  Least Square  -  Mesh points  -  Minimum zone  -  Searching algorithms  -  Terminal sections
 Classification code: 921 Mathematics
 DOI: 10.3969/j.issn.1000-1298.2010.11.043
 Database: Compendex

14. Accession number: 20105213523716
 Title: On-the-go measuring method of soil parameters in field-scale
Authors: Sheng, Wenyi1 ; Zeng, Qingmeng1 ; Lin, Jianhui2 ; Schulze Lammers, P.3 ; Sun, Yurui1
Author affiliation: 1 College of Information and Electronic Engineering, China Agricultural University, Beijing 100083, China
2 School of Technology, Beijing Forestry University, Beijing 100083, China
3 Institute of Agricultural Engineering, University of Bonn, Bonn 53115, Germany
 Corresponding author: Sun, Y. (pal@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 188-192
 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:  On-the-go measurement of soil parameters in field-scale, which managed in a determinate farming and fertilizing mode, was carried out using soil moisture content (MC), electrical conductivity (EC) and mechanical resistance (MR) measuring system and EM38. The correlativity among the soil parameters was investigated based on the soil parameter spatial distribution. The results showed that the combined sensor could response the field MC and EC variation. Soil EC in field scale could be predicted by soil MC, MR and fertilizing information.
 Number of references: 12
 Main heading: Soil surveys
  Controlled terms: Electric conductivity  -  Moisture determination  -  Soil moisture
Uncontrolled terms: Correlation analysis  -  Electrical conductivity  -  Field scale  -  In-field  -  Measuring method  -  Measuring systems  -  Mechanical resistance  -  On-the-go measurement  -  Soil EC  -  Soil moisture content   -  Soil parameters  -  Spatial distribution
Classification code:  483.1 Soils and Soil Mechanics  -  701.1 Electricity: Basic Concepts and Phenomena  -  944.2 Moisture Measurements
 DOI: 10.3969/j.issn.1000-1298.2010.11.037
 Database: Compendex

15. Accession number: 20105213523704
Title: Evaluation of European pear (Pyrus communis L.) firmness based on portable Vis/NIR transmittance technique
 Authors: Wang, Jiahua1, 2 ; Chen, Zhuo3 ; Li, Zhenru4 ; Han, Donghai2
Author affiliation: 1   College of Chemistry and Chemical Engineering, Xuchang University, Xuchang 461000, China
2   College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
3  College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, China
                     4    Daxing Forestry Administration, Beijing 102600, China
 Corresponding author: Han, D. (handh@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 129-133
 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 portable visible (Vis)/near infrared (NIR) spectrometer was performed on pears (Pyrus communis L.) cv 'Abate', 'Conference' and 'Wujiuxiang' for firmness assessment by diffused transmittance technique. One set of 96 pears were used to explore the performance of this technique on developing global firmness models with partial least squares (PLS) and multiple linear regression (MLR) methods. The spectra were treated by 2nd order derivation with Savitsky-Golay (polynomial order 2, data point 25). Genetic algorithms partial least squares (GA-PLS) and regression coefficient method were used to select informative variable for PLS calibration. The global models were obtained by PLS to predict firmness yield the root mean standard error of prediction (RMSEP) of 7.780 N and 8.080 N, and the relative standard deviation of prediction (RSD) of 26.24% and 29.71%, respectively. The global model for firmness measurement was also obtained by MLR with RMSEP of 7.740 N and RSD of 26.10%, respectively. The results highlight the potential of portable Vis/NIR instruments for assessing internal quality of European pear on-site.
 Number of references: 16
 Main heading: Fruits
Controlled terms: Forecasting  -  Genetic algorithms  -  Infrared devices  -  Linear regression  -  Near infrared spectroscopy  -  Spectrometers
Uncontrolled terms: Diffused transmittance  -  European pear  -  Firmness  -  NIR spectroscopy  -  Non-destructive measurement
Classification code: 723 Computer Software, Data Handling and Applications  -  741.3 Optical Devices and Systems  -  821.4 Agricultural Products  -  921 Mathematics  -  922.2 Mathematical Statistics
 DOI: 10.3969/j.issn.1000-1298.2010.11.025
 Database: Compendex

16. Accession number: 20105213523681
Title: Investigations of combustion and exhaust emissions of a diesel engine using Jatropha curcasl oil
 Authors: Luo, Fuqiang1 ; Wang, Ziyu1 ; Liang, Yu2 ; Guo, Jian1
Author affiliation: 1  School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China
2 Department of Mechanical and Electronic Engineering, Guiyang University, Guiyang 550003, China
 Corresponding author: Luo, F. (luofq@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 8-12
 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 main components and properties of physics and chemistry of Jatrapha curcasl oil were analyzed. The characteristics of performances, combustion and exhaust emissions of a ZH1115 diesel engine using different fuels were measured. It is found that when the engine using Jatrapha curcasl oil, the cylinder pressure, the pressure rise rate, emissions of NOx and HC, and the exhaust temperature were all lower than using diesel, the smoke was at equivalent level; however, the CO emissions was higher. The cylinder pressure and pressure rise rate and its NOx emission increased, but when the advance angle of fuel supply increased, the exhaust temperature decreased a little, the CO emission had little change, and HC emission reduced.
 Number of references: 13
 Main heading: Diesel engines
  Controlled terms: Chemical analysis  -  Combustion  -  Engine cylinders  -  Engines
Uncontrolled terms: CO emissions  -  Cylinder pressures  -  Emission  -  Exhaust emission  -  Exhaust temperature  -  Fuel supply  -  HC emissions  -  Jatrapha curcasl oil  -  Jatropha  -  Main component   -  Pressure rise
Classification code: 521.1 Fuel Combustion  -  612 Engines  -  801 Chemistry  -  804 Chemical Products Generally
 DOI: 10.3969/j.issn.1000-1298.2010.11.002
 Database: Compendex

17. Accession number: 20105213523707
Title: Optimization on cellulase and ultrasonic wave assisted extraction technology of Momordica charantia polysaccharides
Authors: Zhang, Lifang1 ; Zhang, Mingwei2 ; Huang, Wen1 ; Zhang, Yan2 ; Zhang, Ruifen2 ; Wei, Zhencheng2
Author affiliation: 1  College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
2  Bio-Technology Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510610, China
 Corresponding author: Zhang, M. (mwzhh@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 142-147
 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: To establish the extraction technology of cellulase assisted by ultrasonic wave of Momordica charantia polysaccharides (MCP), the optimization was applied to discuss some factors including ultrasound power, enzyme amount, the ratio of solid to liquid, extracting time, pH value, temperature with Box-Behnken center-united design and the method of response surface analysis (RSM). Through establishing the second regression model, the optimal parameters were conformed as follows: ultrasound power 390 W, cellulase amount 3500 U/g (enzyme activity was more than 200 U/mg), ratio of solid to liquid 1:38, extracting time 40min, pH value 5, temperature 56°C. Then the yield of crude Momordica charantia polysaccharides is 21.1%, higher 7.8%, 13.5% and 7.7%, respectively, comparing with the specific heat of flooding, ultrasonic wave and cellulase. These results suggested that cellulase assisted by ultrasonic wave extraction technology was one of the effective ways to improve the yield of Momordica charantia polysaccharides.
 Number of references: 19
 Main heading: Ultrasonics
Controlled terms: Enzyme activity  -  Enzymes  -  Extraction  -  Liquids  -  Optimization  -  pH  -  Polysaccharides  -  Regression analysis  -  Surface analysis  -  Surface properties   -  Ultrasonic waves
Uncontrolled terms: Box-Behnken  -  Cellulase  -  Extraction technology  -  Momordica charantia  -  Optimal parameter  -  pH value  -  Regression model  -  Response surface analysis  -  Response Surface Methodology
Classification code: 922.2 Mathematical Statistics  -  921.5 Optimization Techniques  -  804.1 Organic Compounds  -  802.3 Chemical Operations  -  931.2 Physical Properties of Gases, Liquids and Solids  -  801.2 Biochemistry  -  753.1 Ultrasonic Waves  -  461.9 Biology  -  461.2 Biological Materials and Tissue Engineering  -  801.1 Chemistry, General
 DOI: 10.3969/j.issn.1000-1298.2010.11.028
 Database: Compendex

18. Accession number: 20105213523684
 Title: Parameters identification of the fuel film model for spark ignition engines
 Authors: Hong, Munan1 ; Li, Jianqiu1 ; Ouyang, Minggao1
Author affiliation: 1  Department of Automobile Engineering, Tsinghua University, Beijing 100084, China
 Corresponding author: Hong, M. (hmn@mails.tsinghua.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 26-30
 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 improve the accuracy in transient A/F control for spark ignition engines, fuel film model was widely used. The traditional identification methods of the fuel film model were reviewed. To faster parameters identification process, a decoupling auto-identification method was presented. The result of simulation showed that the proposed method was valid. Finally, a theoretic two-equation algorithm, which could calculate the fuel film model parameters directly, was introduced.
 Number of references: 7
 Main heading: Parameter estimation
 Controlled terms: Electric sparks  -  Fuels
Uncontrolled terms: Fuel film model  -  Identification method  -  Parameters identification  -  SI Engines  -  Spark ignition engines  -  Two-equation
Classification code: 522 Gas Fuels  -  523 Liquid Fuels  -  524 Solid Fuels  -  701.1 Electricity: Basic Concepts and Phenomena  -  731.1 Control Systems
 DOI: 10.3969/j.issn.1000-1298.2010.11.005
 Database: Compendex

19. Accession number: 20105213523688
 Title: Performance test of the prototype of electric motor pump
 Authors: Ji, Hong1 ; Li, Zhifeng1 ; Wang, Zhengrong1 ; Wang, Jiansen1 ; Lan, Bojie1
Author affiliation: 1  School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
 Corresponding author: Ji, H. (jihong@lut.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 48-51 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: An experimental system was established for the performance test of the developed prototype of electric motor pump. The parameters consisting of the electric power input, hydraulic power output, rotor speed and internal pressure in the electric motor pump were measured. The characteristic of the rotor speed, noise, power and efficiency changing with the outlet pressure of the prototype was obtained. Compared with the traditional hydraulic power unit which has the same power as the prototype, the volume of the prototype was reduced by 50%, the dimension in axial direction shortened 61% and the noise level lowered 7dB, and the speed of rotor in the prototype decreased apparently with the increased of the output pressure. Furthermore, the bubble separation as a result of the narrow channels and the extra leakage due to the ineffectual seal in the prototype were discussed, and the corresponding solutions were proposed.
 Number of references: 9
 Main heading: Electric locomotives
 Controlled terms: Electric motors  -  Hydraulics  -  Pumps
Uncontrolled terms: Electric motor pumps  -  Hydraulic power unit  -  Leakage  -  Noise  -  Performance tests
Classification code:  618.2 Pumps  -  632.1 Hydraulics  -  704.2 Electric Equipment  -  705.3 Electric Motors
 DOI: 10.3969/j.issn.1000-1298.2010.11.009
 Database: Compendex

20. Accession number: 20105213523713
 Title: Forecast model of greenhouse temperature based on time series method
Authors: Zuo, Zhiyu1 ; Mao, Hanping1 ; Zhang, Xiaodong1 ; Hu, Jing1 ; Han, Lühua1 ; Ni, Jing1
Author affiliation: 1  Key Lab. of Modern Agricultural Equipment and Technology, Ministry of Edu. and Jiangsu Province, Jiangsu University, Zhenjiang 212013, China
 Corresponding author: Mao, H. (maohp@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 173-177 182
 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: Aiming at the existed problem that greenhouse environment control systems can not accurately predict the next stage air temperature inside the greenhouse and provide the basis for the control system to control the temperature optimally, a temperature forecast model based on time series method was developed. The temperature series collected from Jun. 6, 2001 to Sept. 16, 2002 in a hemispherical-roof greenhouse was studied. Firstly, the greenhouse temperature series was annual and first-order differenced in order to get a stationary greenhouse temperature series. Secondly, according to the characteristics of the autocorrelation coefficient and partial correlation coefficient of the first order annual difference series of greenhouse temperature, the ARMA(p, q) model was put forward to fit the greenhouse temperature. Finally, according to the minimum principles of variance estimate and the sum of squares of errors, an ARMA (4, 4) model was determined as the 1-step forecast model of greenhouse temperature in summer. The test results show that the most absolute error and relative error of the forecast temperature of the 1-step forecast model are 0.8°C and 3.2% respectively, and that the average absolute error and relative error are 0.2°C and 1.1% respectively.
 Number of references: 12
 Main heading: Greenhouses
  Controlled terms: Control systems  -  Forecasting  -  Remote control  -  Time series
Uncontrolled terms: Absolute error  -  Air temperature  -  ARMA (p , q)  -  Autocorrelation coefficient  -  Average absolute error  -  First order  -  Forecast  -  FORECAST model  -  Greenhouse environment  -  Greenhouse temperature   -  Minimum Principles  -  Partial correlation  -  Relative errors  -  Sum of squares  -  Temperature forecasts  -  Temperature series  -  Test results  -  Time series method  -  Variance estimate
Classification code: 402.1 Industrial and Agricultural Buildings  -  731.1 Control Systems  -  922.2 Mathematical Statistics
 DOI: 10.3969/j.issn.1000-1298.2010.11.034
 Database: Compendex

21. Accession number: 20105213523702
 Title: Enzymatic preparation of rice anti-oxidation peptide
 Authors: Ma, Haile1 ; Liu, Bin2 ; Li, Shujun1, 2 ; Jia, Junqiang1 ; Tian, Wanmin1
Author affiliation: 1  School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
2  Chinese Academy of Agricultural Mechanization Sciences, Beijing 100083, China
 Corresponding author: Ma, H. (mhl@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 119-123
 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: Protease screening was employed to prepare rice anti-oxidation peptide with enzymolysis method. Scavenging rate of hydrolysate to the DPPH radical was used as an index with rice protein as the raw material. Neutral protease was screened out from the following seven kinds of protease. These kinds of protease were flavor protease, neutral protease, trypsin, complex protease, alkaline protease, papain and pepsin respectively. The optimum hydrolysis conditions obtained from the experiments were as the following: concentration of substrate was 1.0 g/(100 mL), ratios of enzyme-substrate was 8%, pH value 6.0, 60°C and 30min of reaction time. After being diluted 15times, scavenging rate of hydrolysate liquid to the DPPH radical 89.45% could be obtained and EC50 value of hydrolysate scavenging DPPH radical was 0.217 g/(100 mL).
 Number of references: 10
 Main heading: Scavenging
 Controlled terms: Oxidation  -  Peptides
Uncontrolled terms: Anti-oxidation peptide  -  Orthogonal test  -  Protease screening  -  Rice proteins  -  Scavenging rate of DPPH radical
Classification code: 461.9 Biology  -  612.1 Internal Combustion Engines, General  -  802.2 Chemical Reactions
 DOI: 10.3969/j.issn.1000-1298.2010.11.023
 Database: Compendex

22. Accession number: 20105213523720
 Title: Photoelastic study on planar double enveloping hourglass worm gears
 Authors: Zhang, Yanqin1 ; Zhang, Guanghui1
Author affiliation: 1  State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400030, China
 Corresponding author: Zhang, G. (zhanggh2900@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 208-211 227
 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: Several photoelastic materials with different ingredient proportions of firming agent were made up. Freezing elastic ratios of materials were measured by the YE2538 programmable static strain gage. According to the elastic modular ratio of the steel-copper worm gears, suitable materials for worm gears photoelastic model were selected. The worm photoelastic model was made in the way of steel mandrel surrounded with epoxy resin tooth, and the gear was made by the method of integral cast. Worm gears photoelastic model was assembled in the reduction box, and the load was applied by a torsion bar, and stress freezing was finished in the oven. Stress-difference line distribution property of sections of worm gear was observed on the photoelasticimeter 409-I. At last, the result of photoelastic method and the result of the finite element method (FEM) were compared. The result shows that differences of the maximum fringes value among the meshing teeth are minuteness, and secondary primary stress difference at the dedendum and the addendum of the tooth is larger than that near the pitch. In conclusion, the reliability of the photoelastic experiments of the worm gears is confirmed.
 Number of references: 13
 Main heading: Worm gears
Controlled terms: Astatine  -  Epoxy resins  -  Experiments  -  Finite element method  -  Freezing  -  Gages  -  Photoelasticity  -  Resins  -  Stress intensity factors
Uncontrolled terms: Distribution property  -  Double enveloping  -  Finite Element  -  Hourglass worm  -  Photoelastic materials  -  Photoelastic method  -  Photoelastic models  -  Primary stress  -  Simulation  -  Static strain   -  Torsion bar
Classification code: 921.6 Numerical Methods  -  901.3 Engineering Research  -  822.2 Food Processing Operations  -  815.1.1 Organic Polymers  -  943.3 Special Purpose Instruments  -  804 Chemical Products Generally  -  422 Strength of Building Materials; Test Equipment and Methods  -  421 Strength of Building Materials; Mechanical Properties  -  408 Structural Design  -  602 Mechanical Drives and Transmissions
 DOI: 10.3969/j.issn.1000-1298.2010.11.041
 Database: Compendex

23. Accession number: 20105213523690
 Title: Effect of impeller location and flow measurement in volute of a vortex pump
 Authors: Sha, Yi1 ; Hou, Liyan2
Author affiliation: 1  School of Mechanical and Automotive Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China
2   School of Power and Energy Engineering, Jiangsu University, Zhenjiang 212013, China
 Corresponding author: Sha, Y. (shayi01@sina.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 57-62
 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 experiments on changing the axial location of impeller and measurement of flow field in volute with five-hole probe were conducted on a self-built vortex pump (32WB8-12). Based on the experiments, the qv-H, qv-P, qv-η, qv-NPSHc curves and the absolute velocity v, the circumferential velocity vu, the radial velocity vr, the axial velocity vz and the flow static pressure ps were obtained. The experimental results proved that the qv-NPSHc curve showed opposite tendency in the operating conditions of small charge compared with centrifugal pump and anti-cavitation were improved with the increase of the scale S that impeller was inserted into volute. The investigation also showed that the axial vortex was dominant flow in volute but with back-flow existing at the same time. The relationship between performance and parameters of the internal flow and the suction, head formation principles of vortex pump was explained.
 Number of references: 13
 Main heading: Pumps
Controlled terms: Centrifugal pumps  -  Experiments  -  Flow fields  -  Hydraulic machinery  -  Impellers  -  Velocity  -  Vortex flow
Uncontrolled terms: Axial locations  -  Axial velocity  -  Circumferential velocity  -  Internal flows  -  NPSH  -  Operating condition  -  Performance  -  Radial velocity  -  Small charges  -  Static pressure   -  Vortex pumps
Classification code: 601.2 Machine Components  -  618.2 Pumps  -  631.1 Fluid Flow, General  -  632.2 Hydraulic Equipment and Machinery  -  901.3 Engineering Research  -  931.1 Mechanics
 DOI: 10.3969/j.issn.1000-1298.2010.11.011
 Database: Compendex

24. Accession number: 20105213523711
Title: Image segmentation model of plant lesion based on genetic algorithm and fuzzy neural network
 Authors: Guan, Haiou1 ; Xu, Shaohua2 ; Tan, Feng1
Author affiliation: 1  College of Information Technology, Heilongjiang Bayi Agricultural University, Daqing 163319, China
2  School of Computer and Information Technology, Northeast Petroleum University, Daqing 163318, China
 Corresponding author: Xu, S. (xush62@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 163-167
 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: Aiming at the ambiguity and uncertainty of lesion field image border, using inference rule of fuzzy logic and self-adaptive of neural network, the self-adaptive and fuzzy neural network model was proposed to be the decision system for extracting the diseased spots, and the initial values of adjusting parameters were optimized by using genetic algorithm which enhanced the speed of network training, overcame the local minimum of traditional gradient descent method. The experimental result showed that model had many advantages including accuracy, convergence, stability, robustness, and was easy to implement when implied in extracting the diseased spots of potato early blight.
 Number of references: 12
 Main heading: Genetic algorithms
  Controlled terms: Fuzzy inference  -  Fuzzy neural networks  -  Image segmentation
Uncontrolled terms: Adjusting parameters  -  Decision systems  -  Field images  -  Fuzzy neural network model  -  Gradient Descent method  -  Image segmentation model  -  Inference rules  -  Initial values  -  Lesion image  -  Local minimums   -  Network training  -  Plant disease  -  Self-adaptive
Classification code:  723 Computer Software, Data Handling and Applications  -  921 Mathematics
 DOI: 10.3969/j.issn.1000-1298.2010.11.032
 Database: Compendex

25. Accession number: 20105213523693
Title: Water resources allocation of canal system based on multi-objective about RS, GIS and ant colony algorithm
 Authors: Zhang, Zhitao1 ; Liu, Junmin1 ; Chen, Junying1 ; Wang, Zhinong1 ; Li, Yuannong1
Author affiliation: 1 College of Water Resources and Architectural Engineering, Northwest A and F University, Yangling Shaanxi, 712100, China
 Corresponding author: Liu, J. (jmlslx@yahoo.com.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 72-78
 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 view of the existing low efficiency of method problems about the optimization of water allocation of canal system, a multi-objective model about optimization water allocation was established to acquire the highest increased yield benefit and water income of the irrigation district under the basic of soil moisture and the water production function. The information of land use and soil moisture in irrigation area was gained easily by RS technology. The optimization water allocation in each branch under the condition of multi-objective could be obtained by the model solution with ant colony algorithm in GIS system of each the image pixeles. The result accorded with the practical situation of water use in irrigation area. Therefore, this model can be widely used for decision makers to optimize water resources distribution.
 Number of references: 20
 Main heading: Water resources
Controlled terms: Algorithms  -  Economics  -  Geologic models  -  Hydraulic structures  -  Irrigation  -  Moisture determination  -  Multiobjective optimization  -  Soil moisture  -  Water supply
Uncontrolled terms: Ant colony algorithms  -  Canal systems  -  Decision makers  -  GIS  -  Irrigation area  -  Irrigation districts  -  Model solution  -  Multi objective  -  Multiobjective models  -  Resources allocation   -  RS  -  Water allocations  -  Water production  -  Water use
Classification code: 944.2 Moisture Measurements  -  921.5 Optimization Techniques  -  921 Mathematics  -  821.3 Agricultural Methods  -  723 Computer Software, Data Handling and Applications  -  971 Social Sciences  -  611 Hydroelectric and Tidal Power Plants  -  481.1 Geology  -  446.1 Water Supply Systems  -  444 Water Resources  -  441 Dams and Reservoirs; Hydro Development  -  483.1 Soils and Soil Mechanics
 DOI: 10.3969/j.issn.1000-1298.2010.11.014
 Database: Compendex

26. Accession number: 20105213523714
 Title: Voltage compensation method of WSN soil moisture acquisition nodes
  Authors: Zhang, Rongbiao1 ; Yu, Gongjiang1 ; Zhang, Lei1 ; Liu, Jun1 ; Zhang, Yecheng1
Author affiliation: 1  School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
 Corresponding author: Zhang, R. (zrb@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 178-182
 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 the voltage-sensitive problem of EC-5 sensor which was suitable for WSN soil moisture acquisition nodes, the sources of detection error was analyzed according to the sensor working principle. It was found that the error would increase with the soil moisture when sensor parameters were determined. Using CC2430 platform as WSN information transmission node, WSN soil moisture acquisition system with multiple nodes based on controller and host computer was established. Taking node voltage u and the real soil moisture θ as parameters, the inverse modeling of nonlinear soil moisture sensor system was performed by neural network, and the compensation of EC-5 sensor detection error caused by supply voltage was implemented in host computer. Experimental results showed that this method could sharply reduce the influence caused by node voltage variation and improve the detection precision.
 Number of references: 13
 Main heading: Neural networks
Controlled terms: Error compensation  -  Error detection  -  Inverse problems  -  Mergers and acquisitions  -  Moisture control  -  Moisture determination  -  Sensor networks  -  Soil moisture  -  Wireless sensor networks
Uncontrolled terms: Acquisition systems  -  Compensation  -  Detection error  -  Host computers  -  Information transmission  -  Inverse modeling  -  Multiple nodes  -  Node voltages  -  Sensitive problems  -  Sensor parameter   -  Soil moisture sensors  -  Supply voltages  -  Voltage compensation  -  Wireless sensor  -  Working principles
Classification code: 944.2 Moisture Measurements  -  921 Mathematics  -  912 Industrial Engineering and Management  -  732 Control Devices  -  723.4 Artificial Intelligence  -  721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory  -  483.1 Soils and Soil Mechanics
 DOI: 10.3969/j.issn.1000-1298.2010.11.035
 Database: Compendex

27. Accession number: 20105213523694
Title: Evaluation of comprehensive benefit in greenhouse muskmelon under aeration irrigation
 Authors: Xie, Hengxing1 ; Cai, Huanjie1 ; Zhang, Zhenhua2
Author affiliation: 1  Key Laboratory for Agricultural Soil and Water Engineering in Arid Areas, Ministry of Education, Northwest A and F University, Yangling Shaanxi, 712100, China
2  College of Geography and Planning, Ludong University, Yantai 264025, 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: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 79-83
 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: Evaluation of comprehensive benefit was conducted in greenhouse muskmelon under aeration irrigation by applying comprehensive evaluation method, which associated entropy information method based on objective weighting with subjective weighting method. Results showed that the comprehensive benefit order in every treatment was once per two days, once per day, none aeration, once per three days, twice per day, and furrow irrigation treatment. Aeration irrigation could improve yield and quality of greenhouse muskmelon differently, but the comprehensive benefit of some aeration treatments decreased because of the investment of electricity, drip facility, et al. The comprehensive benefit of greenhouse muskmelon in subsurface irrigation treatment was better than in furrow irrigation treatment.
 Number of references: 24
 Main heading: Greenhouses
 Controlled terms: Subirrigation
Uncontrolled terms: Aeration irrigation  -  Aeration treatment  -  Comprehensive benefit  -  Comprehensive evaluation  -  Furrow irrigation  -  Irrigation treatments  -  Subjective weighting
Classification code: 821.3 Agricultural Methods  -  821.6 Farm Buildings and Other Structures
 DOI: 10.3969/j.issn.1000-1298.2010.11.015
 Database: Compendex

28. Accession number: 20105213523712
 Title: Weed identification based on features optimization and LS-SVM in the cotton field
 Authors: Li, Xianfeng1, 2 ; Zhu, Weixing1 ; Ji, Bin1 ; Liu, Bo1
Author affiliation: 1  School of Electronic and Information Engineering, Jiangsu University, Zhenjiang 212013, China
2  School of Information Engineering, Yancheng Institute of Technology, Yancheng 224051, China
 Corresponding author: Zhu, W. (wxzhu@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title:  Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 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: In order to improve the accuracy and efficiency of weed identification, a method for cotton-weed recognition was proposed by using the combination technique of features optimization and least squares support vector machine (LS-SVM). After a series of image processing such as graying, filtering and threshold segmenting, six geometric shape features and seven Hu moment invariants were extracted from the single plant leaf. Then, using particle swarm optimization (PSO) algorithm, the extracted features were optimized in order to reduce the size of the training data sets. Finally, the weed was identified by using the trained classifier. The experimental results indicate that this method can effectively compact feature subset and maintain a higher accuracy than using the original feature set, the average correct identification rate is 95.8%.
 Number of references: 13
 Main heading: Particle swarm optimization (PSO)
Controlled terms: Cotton  -  Feature extraction  -  Image processing  -  Support vector machines
Uncontrolled terms: Feature selection  -  Feature sets  -  Feature subset  -  Geometric shape  -  Hu moments  -  Identification rates  -  Least squares support vector machines  -  Particle swarm  -  Particle swarm optimization algorithm  -  Single plants   -  Training data sets  -  Weed identification
Classification code: 716 Telecommunication; Radar, Radio and Television  -  723 Computer Software, Data Handling and Applications  -  741 Light, Optics and Optical Devices  -  819.1 Natural Fibers
 DOI: 10.3969/j.issn.1000-1298.2010.11.033
 Database: Compendex

29. Accession number: 20105213523715
Title: Research of soil conductivity measuring technique with TDR based on phase detecting principle
 Authors: Yang, Weizhong1, 2 ; Wang, Yiming1 ; Li, Baoguo2 ; Wang, Kedong3
Author affiliation: 1  College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China
2  College of Resources and Environmental Sciences, China Agricultural University, Beijing 100094, China
3  College of Computer and Information Engineering, Beijing Technology and Business University, Beijing 100048, China
 Corresponding author: Wang, Y. (ym_wang@263.net)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 183-187
 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: P-TDR is a new time-domain reflectometry based on the phase detection principle. It measures the travel time of testing signal by detecting phase difference of the incident and reflected waves, and thereby calculates the soil moisture content. The P-TDR measurement accuracy of soil moisture content reaches the level of the traditional TDR. But if it is used to measure soil conductivity (σ) by detecting the testing signal reflectivity (ρ), verification is necessary. The measurement method of soil conductivity and the principle of P-TDR were introduced firstly. Then an experiment was arranged. The testing signal reflectivity of P-TDR was measured in 8 sandy loam soil samples, which had different salt contents under five levels of soil moisture content (θ). The relationship between ρ and σ was modeled respectively by using linear and quadratic polynomial model, and the quadratic polynomial was chose for P-TDR electrical conductivity measurement model, whose determination coefficient was above 0.812. The experiment results also showed that soil moisture content had greater influence on the electrical conductivity measurement. After the analysis of the relationship between soil moisture and the quadratic polynomial coefficients, the predictive model of soil electrical conductivity, which is the function of ρ and θ, was established. The experiments of in-situ measurements are needed to research the influence of factors such as soil texture on the P-TDR soil conductivity measurement.
 Number of references: 20
 Main heading: Soil surveys
Controlled terms: Electric conductivity  -  Electric conductivity measurement  -  Experiments  -  Geologic models  -  Moisture determination  -  Polynomials  -  Reflection  -  Reflectometers  -  Salinity measurement  -  Signal detection   -  Soil moisture  -  Soil testing  -  Time domain analysis
Uncontrolled terms: AS-soils  -  Determination coefficients  -  Electrical conductivity  -  Electrical conductivity measurements  -  In-situ measurement  -  Measurement accuracy  -  Measurement methods  -  Measuring technique  -  Phase detecting  -  Phase detection   -  Phase difference  -  Predictive models  -  Quadratic polynomial  -  Reflected waves  -  Salinity  -  Salt content  -  Sandy loam soils  -  Soil conductivity  -  Soil electrical conductivity  -  Soil moisture content   -  Testing signal  -  Time Domain Reflectometry  -  Travel time
Classification code: 944.2 Moisture Measurements  -  942.2 Electric Variables Measurements  -  941.3 Optical Instruments  -  921.1 Algebra  -  921 Mathematics  -  901.3 Engineering Research  -  716.1 Information Theory and Signal Processing  -  711 Electromagnetic Waves  -  701.1 Electricity: Basic Concepts and Phenomena  -  483.1 Soils and Soil Mechanics  -  481.1 Geology
 DOI: 10.3969/j.issn.1000-1298.2010.11.036
 Database: Compendex

30. Accession number: 20105213523695
Title: Comparison of evapotranspiration of the natural vegetation in the Otindag Sandy Area using two calculation methods
 Authors: Liu, Yanwei1 ; Zhu, Zhongyuan1 ; Wu, Yun1 ; Jing, Yulong2 ; Chaolunbagen1
Author affiliation: 1  College of Hydraulics and Civil Engineering, Inner Mongolia Agricultural University, Huhhot 010018, China
                   2  Forestry Administration of Kailu, Kailu 028400, China
 Corresponding author: Zhu, Z. (zhongyuanzhu@sohu.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 84-88
 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: Using SWAP (soil-water-atmosphere-plant) model and dual crop coefficient approach presented in the FAO irrigation and drainage paper 56 (FAO-56, 1998, crop evapotranspiration, guidelines for computing crop water requirement), the evapotranspiration of the natural vegetation in Otindag Sandy Area was calculated. The main results indicate that SWAP model and dual crop coefficient approach can be used to simulate evapotranspiration. SWAP model can simulate soil profile soil volumetric moisture.
 Number of references: 14
 Main heading: Geologic models
Controlled terms: Crops  -  Evapotranspiration  -  Soils  -  Vegetation  -  Water supply
Uncontrolled terms: Calculation methods  -  Crop coefficient  -  Crop evapotranspiration  -  Crop water requirements  -  Natural vegetation  -  Sandy area  -  Soil profiles  -  Soil water  -  SWAP model
Classification code: 444.1 Surface Water  -  446.1 Water Supply Systems  -  481.1 Geology  -  483.1 Soils and Soil Mechanics  -  821 Agricultural Equipment and Methods; Vegetation and Pest Control  -  821.4 Agricultural Products
 DOI: 10.3969/j.issn.1000-1298.2010.11.016
 Database:  Compendex

31. Accession number: 20105213523683
 Title: Delay-dependent H∞ control of GDI engine under idling mode
 Authors: Zhao, Jinghua1 ; Hong, Wei1 ; Li, Xuejun1, 2 ; Li, Jue1
Author affiliation: 1  State Key Laboratory of Automotive Dynamic Simulation, Jilin University, Changchun 130025, China
2  Electronic Engineering College, Changchun University, Changchun 130022, China
 Corresponding author: Hong, W. (hongw@jlu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 20-25
 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: Based on nonlinear time-delay mean value idling mode of GDI engine, aiming at torque interfere generated by auto accessories using of electricity under idling mode, the delay-dependent H∞ state feedback controller was designed. It did not only guarantee the closed-loop control system asymptotic stability, but also met suppression ability as γ about the output to disturbance input. The delay included induction-to-torque delay under steady state of engine, delay between time of air input controlled by air throttle to actual time of this section into the cylinder under transient state of engine, also included delay of the action of the air throttle. The time-delay which was discussed was all uncertain time-invariant, but each had a constant upper bound. Finally, the modeling correctness and validity of control method was verified by using the exact engine model established by en_DYNA software. Compared with control effects of controller without considering delay and delay-independent controller which was designed with considering the time-delay problem, the integrated control effects of delay-dependent controller designed by this research is the best .
 Number of references: 10
 Main heading: State feedback
Controlled terms: Asymptotic stability  -  Control system stability  -  Controllers  -  Delay control systems  -  Engine cylinders  -  Engines  -  Feedback  -  Speed control  -  Speed regulators  -  Time delay
Uncontrolled terms: Control methods  -  Delay independent  -  Delay-dependent  -  En-DYNA  -  Engine models  -  GDI engine  -  Idle speed control  -  Mean values  -  State feedback controller  -  Steady state   -  Time delay problem  -  Time invariants  -  Transient state  -  Upper Bound
Classification code: 612 Engines  -  612.1.1 Internal Combustion Engine Components  -  713 Electronic Circuits  -  731 Automatic Control Principles and Applications  -  732.1 Control Equipment  -  921.6 Numerical Methods
 DOI: 10.3969/j.issn.1000-1298.2010.11.004
 Database:  Compendex

32. Accession number: 20105213523692
Title: Effect on characteristics of soil water and salt movement about saline water infiltration with different infiltration amount
 Authors: Wu, Zhongdong1 ; Wang, Quanjiu2
Author affiliation: 1  Institute of Resources and Environment Engineering, Shandong University of Technology, Zibo 255048, China
2  Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an 710048, China
 Corresponding author: Wang, Q. (wquanjiu@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 67-71 78
 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 the sake of rational exploitation and utilization of shallow layer underground saline water, through laboratory infiltration experiment in Nanpi Ecological Experimental Station of Chinese Academy of Science, soil moisture content, salinity, desalting efficiency and cation distribution were analyzed with saline water of 3 g/L. Its purpose was to study the soil infiltration characteristics irrigated with saline water in North China. The results showed that under the vertical one-dimensional ponding infiltration with saline water of 3 g/L, matric potential was the main driving force of water movement when the infiltration amount was comparatively small; gravity potential gradually replaced the matric potential to become major driving force for water movement when infiltration amount became lager; upper soil would be desalted and soil salt content would increase to reach maximum infiltrated with saline water of 3 g/L; relationship between soil salt content in wetting front and infiltration amount according with the exponential function, desalting efficiency of active rooting zone negatively correlated with cumulative infiltration. In short, with saline water was used in farm irrigation, both the effect of salt leaching and the desalting efficiency must be considered to make soil used sustainably.
 Number of references: 12
 Main heading: Saline water
Controlled terms: Desalination  -  Ecology  -  Exponential functions  -  Leaching  -  Moisture determination  -  Seepage  -  Soil mechanics  -  Soil moisture  -  Underwater soils  -  Water content
Uncontrolled terms: Cation distributions  -  Chinese Academy of Sciences  -  Desalting efficiency  -  Driving forces  -  Experimental stations  -  Gravity potential  -  Matric potential  -  Moisture content  -  North China  -  Rooting zones   -  Salt leaching  -  Shallow layers  -  Soil infiltration  -  Soil moisture content  -  Soil salt content  -  Soil water  -  Water infiltration  -  Water movements  -  Wetting fronts
Classification code: 944.2 Moisture Measurements  -  921 Mathematics  -  533.1 Ore Treatment  -  483.1 Soils and Soil Mechanics  -  454.3 Ecology and Ecosystems  -  445.1 Water Treatment Techniques  -  444 Water Resources  -  441 Dams and Reservoirs; Hydro Development  -  407 Maritime and Port Structures; Rivers and Other Waterways
 DOI: 10.3969/j.issn.1000-1298.2010.11.013
 Database: Compendex

33. Accession number: 20105213523703
Title: Enzymic method extraction of collagen from bovine bone by high intensity pulsed electric fields
 Authors: He, Guidan1 ; Yin, Yongguang1 ; Meng, Li2 ; Yan, Linna1 ; Yu, Qingyu1
Author affiliation: 1  College of Biological and Agricultural Engineering, Jilin University, Changchun 130025, China
         2   Gelita Liaoyuan Gelatine Co. Ltd., Liaoyuan 136200, China
 Corresponding author: Yin, Y. (biofood@jlu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 124-128
 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: Bovine bone was used as the raw material to extract collagen by the high-intensity pulsed electric fields. The optimal processing conditions were acquired by the single-factor experiments and the Box-Behnken experiment. The most yield of dissoluble collagen 16.21 mg/mL was achieved under the following conditions: substrate concentration 1.0 g/(100 mL), pepsin concentration 3%, pH value 2.5, electric field intensity 21.98 kV/cm, electric pulse number 7. The extracted collagen was identified by UV spectra that it was the pure collagen protein and did not contain other miscellaneous proteins.
 Number of references: 12
 Main heading: Extraction
  Controlled terms: Bone  -  Collagen  -  Electric fields  -  Ultraviolet spectroscopy
Uncontrolled terms: Bovine bone  -  Box-Behnken  -  Collagen proteins  -  Electric field intensities  -  Electric pulse  -  Enzymic method  -  High-intensity pulsed electric fields  -  Method extraction  -  Optimal processing  -  pH value   -  Substrate concentrations  -  UV spectrum
Classification code: 461.2 Biological Materials and Tissue Engineering  -  701.1 Electricity: Basic Concepts and Phenomena  -  801 Chemistry  -  802.3 Chemical Operations
 DOI: 10.3969/j.issn.1000-1298.2010.11.024
 Database:  Compendex

34. Accession number: 20105213523696
 Title: Design and experiment on anti-slagging biomass pellet fuel burner
Authors: Yao, Zonglu1 ; Meng, Haibo1 ; Tian, Yishui1 ; Zhao, Lixin1 ; Luo, Juan1 ; Sun, Liying1
Author affiliation: 1 Institute of Energy and Environmental Protection, Chinese Academy of Agricultural Engineering, Beijing 100125, China
 Corresponding author: Tian, Y. (yishuit@yahoo.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 89-93 137
 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 new burner, named PB-20 biomass pellet fuel burner, was developed at the Chinese Academy of Agricultural Engineering to solve the problem of easy flameout and slagging of burner during pellet combustion as there were higher ash and lower ash melting temperature in the pellet made of crop straw in China. The double combustion cylinder efficient device which adopted multi-level wind principles, a helix device breaking slagging and cleaning ash were designed. Combustion experiment with the corn straw pellet fuel and larch wood pellet was conducted after this pellet burner was made. The results showed the burner worked well and the ash and slagging were expelled because of double combustion cylinder efficient and helix device. The slagging rate is 23% and the combustion efficiency is up to 91%. The slagging rate of PB-20 biomass pellet fuel burner decreased by 25.94% and combustion efficiency increased by 9% compared with burner made from Sweden.
 Number of references: 14
 Main heading: Pelletizing
Controlled terms: Agricultural engineering  -  Biomass  -  Combustion  -  Crops  -  Cylinders (shapes)  -  Design  -  Experiments  -  Fuel burners  -  Fuels
Uncontrolled terms: Ash melting  -  Bio-mass energy  -  Biomass pellet fuels  -  Burner  -  Combustion efficiencies  -  Combustion experiments  -  Corn straws  -  HELIX device  -  Multi-level  -  Pellet fuels   -  Wood pellet
Classification code: 821 Agricultural Equipment and Methods; Vegetation and Pest Control  -  802.3 Chemical Operations  -  524 Solid Fuels  -  523 Liquid Fuels  -  901.3 Engineering Research  -  522 Gas Fuels  -  521.1 Fuel Combustion  -  408.2 Structural Members and Shapes  -  408 Structural Design  -  521.3 Fuel Burners
 DOI: 10.3969/j.issn.1000-1298.2010.11.017
 Database: Compendex

35. Accession number: 20105213523710
  Title: Measurement method of depth information of tree images based on binocular vision
 Authors: Hu, Tianxiang1 ; Zheng, Jiaqiang1 ; Zhou, Hongping1
Author affiliation: 1  College of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing 210037, China
 Corresponding author: Zheng, J. (jqzheng@njfu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 158-162
 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: A binocular vision technology was used in intelligence on the targeting sprayer. Parallel axis camera captured images was used in the experiments, and through the mode of finding feature points in tree images to match the two images to solve comparability problems. Then the distance and its error between camera and the object trees were calculated. The average error was maintained within the range of 8%. Applying this method can make the intelligent pesticide target spraying so as to improve the efficiency.
 Number of references: 12
 Main heading: Binocular vision
 Controlled terms: Cameras
Uncontrolled terms: Average errors  -  Camera-captured images  -  Depth information  -  Feature point  -  Intelligent spraying  -  Measurement methods  -  Parallel axis  -  Tree image  -  Vision technology
 Classification code: 741.2 Vision  -  742.2 Photographic Equipment
 DOI: 10.3969/j.issn.1000-1298.2010.11.031
 Database: Compendex

36. Accession number: 20105213523705
 Title: Experiment on factors influencing chestnut vacuum shelling performance
Authors: Yuan, Yuejin1 ; Xu, Yingying1 ; Zhang, Yanhua1 ; Dang, Xin'an1 ; Yang, Lijun1 ; Pan, Wu1
Author affiliation: 1  College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
 Corresponding author: Dang, X. (dangxa@sust.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title:  Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 134-137
 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: Using a self-made device of vacuum shelling for chestnut, the research on factors influencing the chestnut vacuum shelling performance was carried out. The results indicated that the size and shape of the chestnut had a significant effect on the vacuum shelling performance. The shelling rate increased with the increase of vacuum. The increase of the vacuum temperature and time, and the preheating chestnut under proper temperature could increase the shelling rate effectively. The optimized technology conditions of the chestnut vacuum shelling were as follows: hemispherical chestnut with the weight ranging from 7.5~10.0 g per unit, pre-heating temperature 80°C and time 40 minutes, vacuum degree 2 kPa and shelling temperature 80°C and time 60 minutes.
 Number of references: 12
 Main heading: Vacuum technology
  Controlled terms: Experiments  -  Fruits  -  Vacuum
Uncontrolled terms: Chestnut  -  Influence factors  -  Per unit  -  Size and shape  -  Technology condition  -  Vacuum degree
Classification code: 633 Vacuum Technology  -  821.4 Agricultural Products  -  901.3 Engineering Research
 DOI: 10.3969/j.issn.1000-1298.2010.11.026
 Database: Compendex

37. Accession number: 20105213523698
 Title: Distributed CCHP based on biomass gasification
Authors: Guan, Haibin1 ; Sun, Rongfeng1 ; Yan, Guihuan1, 2 ; Zhang, Weijie1 ; Jiang, Jianguo3 ; Li, Xiaoxia3
Author affiliation: 1  Energy Research Institute, Shandong Academy of Sciences, Ji'nan 250014, China
2  School of Energy and Power Engineering, Shandong University, Ji'nan 250061, China
3  Key Laboratory for Biomass Gasification Technology of Shandong Province, Ji'nan 250014, China
 Corresponding author: Guan, H. (guanhb@sderi.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 98-104
 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: Definition and characteristics of distributed combined cooling, heating and power system (CCHP) were briefly summarized. The principle of biomass gasification system was mainly introduced, and several application modes of CCHP based on biomass gasification (BGCCHP) were discussed. At last, the advantages and difficulties of developing BGCCHP in China were analyzed. BGCCHP could realize the cascade utilization of energy coming along with social, economic and environmental benefits and it is an efficient and comprehensive way for biomass resource exploitation and application.
 Number of references: 24
 Main heading: Gasification
  Controlled terms: Biomass  -  Cooling  -  Heating
Uncontrolled terms: Biomass Gasification  -  Biomass gasification system  -  Biomass resources  -  Combined cooling  -  Distribution  -  Economic and environmental benefits  -  Heating and power
Classification code: 525.1 Energy Resources and Renewable Energy Issues  -  643.1 Space Heating  -  802.3 Chemical Operations
 DOI: 10.3969/j.issn.1000-1298.2010.11.019
 Database: Compendex

38. Accession number: 20105213523691
Title: Numerical simulation of the water hammer caused by accidental pump-stop in long water supply systems
 Authors: Wang, Wenquan1 ; Zhang, Lixiang1 ; Yan, Yan1 ; Zeng, Yun1
Author affiliation: 1  Department of Engineering Mechanics, Kunming University of Science and Technology, Kunming 650051, China
 Corresponding author: Wang, W. (wwqquan@yahoo.com.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 63-66 62
 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 accordance with the characteristics of a long water pipe supply system with water hammer, the analysis of the protecting devices combined with the air valve, pressure relief valve and slowly closed plate valve was carried out for the transient process caused by accidental pump-stop based on the theory of water hammer and the method of characteristics. The pressure of water hammer and relative cavitating volume along the pipeline were obtained simultaneously. The evolvement of pressure of water hammer against time was achieved. The numerical results showed that the present water hammer protections to the pipeline system were necessary, which restrained not only the continuously rising up but also the excessively decreasing of water hammer pressure and were helpful to suppress the occurrence of water column separation. However, the results also showed the cavitations in local raised position of pipeline. The optimization of the position about air valves should be implemented further.
 Number of references: 7
 Main heading: Hammers
Controlled terms: Cavitation  -  Hydraulics  -  Pipelines  -  Pressure relief valves  -  Pumps  -  Surge protection  -  Tools  -  Water hammer  -  Water pipelines  -  Water supply
Uncontrolled terms: Air valves  -  Hydraulic calculations  -  Method of characteristics  -  Numerical results  -  Numerical simulation  -  Pipe-line systems  -  Plate valve  -  Pressure of water  -  Pressure of water hammer  -  Pump station   -  Transient process  -  Water columns  -  Water hammer pressure  -  Water pipes  -  Water supply project
Classification code: 632.2 Hydraulic Equipment and Machinery  -  632.1 Hydraulics  -  631.1.1 Liquid Dynamics  -  631.1 Fluid Flow, General  -  619.1.1 Pipe Accessories  -  704 Electric Components and Equipment  -  619.1 Pipe, Piping and Pipelines  -  605.2 Small Tools, Unpowered  -  605 Small Tools and Hardware  -  603 Machine Tools  -  446.1 Water Supply Systems  -  618.2 Pumps
 DOI: 10.3969/j.issn.1000-1298.2010.11.012
 Database: Compendex

39. Accession number: 20105213523689
Title: Energy characteristics prediction of centrifugal pumps based on artificial neural network
Authors: Tan, Minggao1 ; Liu, Houlin1 ; Yuan, Shouqi1 ; Wang, Yong1 ; Wang, Kai1
Author affiliation: 1  Technical and Research Center of Fluid Machinery Engineering, Jiangsu University, Zhenjiang 212013, China
 Corresponding author: Tan, M. (tmgwxf@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 52-56
 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 application of the BP and RBF artificial neural networks in energy characteristics prediction of centrifugal pumps was summarized. The structure and characteristics of the two artificial neural networks were introduced in detail. The models of BP and RBF artificial neural network were established respectively to predict the centrifugal pump energy characteristics. The characteristics data of 57 centrifugal pumps were used to train the two models, and the data of the other 6 centrifugal pumps were used to test the two models. The study shows that the prediction results of the two networks are closer and the trends of prediction results are the same for the two networks. The precision of BP network is a little higher than that of RBF network. The head average prediction discrepancy for BP network is 3.85% and the efficiency average discrepancy is 1.39% points. The head average prediction discrepancy for RBF network is 4.79% and the efficiency average discrepancy is 3.43% points. The prediction time of RBF network is only half the time of BP network.
 Number of references: 10
 Main heading: Neural networks
Controlled terms: Backpropagation  -  Centrifugal pumps  -  Forecasting  -  Hydraulic machinery  -  Pumping plants  -  Pumps  -  Radial basis function networks
Uncontrolled terms: Artificial Neural Network  -  BP networks  -  Characteristics prediction  -  Energy characteristics  -  Pump energies  -  Rbf artificial neural networks  -  RBF Network
Classification code: 446 Waterworks  -  618.2 Pumps  -  632.2 Hydraulic Equipment and Machinery  -  723.4 Artificial Intelligence  -  921 Mathematics
 DOI: 10.3969/j.issn.1000-1298.2010.11.010
 Database: Compendex

40. Accession number: 20105213523706
 Title: Design of chestnut shell-cutting machine using laser
Authors: Xiao, Hongwei1 ; Lin, Hai2 ; Gao, Zhenjiang1 ; Zhang, Linquan3 ; Pang, Changle1 ; Wang, Haipeng1
Author affiliation: 1  College of Engineering, China Agricultural University, Beijing 100083, China
2  College of Machinery and Electricity Engineering, Shihezi University, Shihezi 832003, China
3  Guangdong Agricultural Machinery Research Institute, Guangzhou 510630, China
 Corresponding author: Gao, Z. (zjgao@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 138-141
 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 laser cutting technique was applied to chestnut shell-cutting process. The chestnut shell-cutting machine was consisted of a vibration feeder, V-shaped belt for chestnut positioning and conveying, motor drive system, laser generator, mirrors for laser reflection and focusing, control panel etc. The experiments of chestnut shell-cutting and shell puffing using laser indicated that the shell puffing rate of chestnut cut increased with increasing of the laser power or decreased with increasing of chestnut delivery speed. When the laser power is 80 W and the chestnut delivery speed is 0.12 m/s (means that 3 or 4 chestnuts shell could be cut per second) the shell puffing rate of chestnut cut is above 98% and its cutting quality is the best.
 Number of references: 11
 Main heading: Fruits
Controlled terms: Cutting  -  Cutting equipment  -  Electric drives  -  Machine design  -  Machinery  -  Mirrors  -  Shells (structures)
Uncontrolled terms: Chestnut  -  Control panels  -  Cutting machines  -  Cutting process  -  Cutting quality  -  Delivery speed  -  Laser cutting  -  Laser generators  -  Laser power  -  Laser reflection   -  Motor drive system  -  Shell puffing  -  Shell-cutting machine
Classification code:  408.2 Structural Members and Shapes  -  601 Mechanical Design  -  604.1 Metal Cutting  -  705 Electric Generators and Motors  -  741.3 Optical Devices and Systems  -  821.4 Agricultural Products
 DOI: 10.3969/j.issn.1000-1298.2010.11.027
 Database: Compendex

41. Accession number: 20105213523685
Title: Experiment on damage of cavitation and silt abrasion for hydrofoil in silt-laden water flow
 Authors: Zhang, Tao1 ; Chen, Cichang2 ; Guo, Qing3
Author affiliation: 1  School of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China
2  Mechatronic Engineering College, Southwest Petroleum University, Chengdu 610500, China
3  College of Petroleum Engineering, China University of Petroleum, Beijing 100011, China
 Corresponding author: Zhang, T. (zhangt@swpu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 31-37
 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 simulation of the flow in hydraulic machinery, experiments of cavitation, silt abrasion and their synergism on hydrofoil in the converging-diverging testing section were performed, and microscopic appearance along the damage surface was observed and depth distribution of damage was measured. The cavitation appearance shows like normal approximate round, and distributes randomly. According to the difference of action parameter on surface, silt abrasion appearance registers as wedging, relieving, ploughing, and cutting, etc. On the high particle content, the appearance of synergism mostly appears as particle wear in extreme angles (90° or 0°), and scale character on hydrofoil surface becomes more and more large than silt abrasion appearance along the position, and the depth of macro-damage is obviously bigger than single wear. On the low particle content, the microstructure probably appears as the coexistence of cavitation and silt abrasion.
 Number of references: 10
 Main heading: Silt
Controlled terms: Abrasion  -  Cavitation  -  Flow of water  -  Hydraulic machinery  -  Hydraulics  -  Hydrofoils  -  Microstructure  -  Normal distribution  -  Surface testing  -  Tribology
Uncontrolled terms: Depth distribution  -  Hydrofoil surfaces  -  Particle content  -  Water flows
Classification code: 951 Materials Science  -  933 Solid State Physics  -  931 Classical Physics; Quantum Theory; Relativity  -  922.1 Probability Theory  -  632.2 Hydraulic Equipment and Machinery  -  632.1 Hydraulics  -  631.1.1 Liquid Dynamics  -  483.1 Soils and Soil Mechanics  -  423.2 Non Mechanical Properties of Building Materials: Test Methods
 DOI: 10.3969/j.issn.1000-1298.2010.11.006
 Database: Compendex

42. Accession number: 20105213523686
 Title: Relationship between wrap angle of impeller and performance of pump
 Authors: Zhang, Xiang1 ; Wang, Yang1 ; Xu, Xiaomin1 ; Wang, Hongyu1
Author affiliation: 1  Technical and Research Center of Fluid Machinery Engineering, Jiangsu University, Zhenjiang 212013, China
 Corresponding author: Wang, Y. (pgwy@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 38-42
 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 influence of relationship between wrap angle of impeller on performance of a pump was analyzed with the same main dimensions of centrifugal pumps unchanged. Blades were shaped using Hermite interpolation method. The wrap angle of impellers used in this investigation is 90°, 120°, 150° and 180° respectively. The result of numerical simulation indicates that the wrap angle changes the head and power characteristics by changing the relative velocity angle in impeller outlet. The effect of the different wrap angles is similar to that of the different impeller outlet blade angles. The bigger the wrap angle is, the smaller the separation and vortex in impeller passages are. With the wrap angle increases, the streamlines and blade profiles are getting similar, but the friction loss in impeller passages is getting large. So there exists an optimum wrap angle that corresponds to the highest efficiency of a centrifugal pump.
 Number of references: 15
 Main heading: Pumps
Controlled terms: Blowers  -  Centrifugal pumps  -  Computer simulation  -  Flow measurement  -  Hydraulic machinery  -  Impellers  -  Mathematical models  -  Pumping plants
Uncontrolled terms: Blade profile  -  Friction loss  -  Hermite interpolation method  -  Impeller outlet  -  Impeller passage  -  Numerical simulation  -  Performance  -  Power characteristic  -  Relative velocity  -  Wrap angle
Classification code: 921 Mathematics  -  723.5 Computer Applications  -  632.2 Hydraulic Equipment and Machinery  -  943.2 Mechanical Variables Measurements  -  618.3 Blowers and Fans  -  601.2 Machine Components  -  446 Waterworks  -  618.2 Pumps
 DOI: 10.3969/j.issn.1000-1298.2010.11.007
 Database: Compendex

43. Accession number: 20105213523687
 Title: Numerical investigation of unsteady pressure fluctuations in centrifugal pump
 Authors: Zhu, Rongsheng1, 2 ; Su, Baowen1 ; Yang, Ailing2 ; Fu, Qiang1 ; Wang, Xiuli1
Author affiliation: 1  Technical and Research Center of Fluid Machinery Engineering, Zhenjiang 212013, China
                   2  Jiangsu Guoquan Pump Co. Ltd., Zhenjiang 212009, China
 Corresponding author: Zhu, R. (zrs@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 43-47
 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 research was conducted for the purpose of studying the rules of pressure fluctuation under different positions in a centrifugal pump, and to find their relationships. The frequency spectra of pressure signal located at the pump was obtained with CFD. The results showed that the blade passing frequency dominated the pressure fluctuations at the design and large flow rate condition, and at the small flow rate condition the axis frequency became dominative in the pressure fluctuations. The amplitude of the pressure fluctuation was different at the varied flow rates, and the amplitude became higher at inlet and outlet of the passage.
 Number of references: 12
 Main heading: Frequency domain analysis
Controlled terms: Centrifugal pumps  -  Combustors  -  Computational fluid dynamics  -  Computer simulation  -  Hydraulic machinery  -  Inlet flow  -  Pumping plants  -  Pumps  -  Spectroscopy
Uncontrolled terms: Blade passing frequency  -  Frequency spectra  -  Large flow rate  -  Numerical investigations  -  Numerical simulation  -  Pressure fluctuation  -  Pressure signal  -  Small flow-rate  -  Unsteady pressures
Classification code: 801 Chemistry  -  731.1 Control Systems  -  723.5 Computer Applications  -  802.1 Chemical Plants and Equipment  -  632.2 Hydraulic Equipment and Machinery  -  618.2 Pumps  -  446 Waterworks  -  631.1 Fluid Flow, General
 DOI: 10.3969/j.issn.1000-1298.2010.11.008
 Database: Compendex

44. Accession number: 20105213523699
 Title: Properties of Fuji apple superficial scald in the 100 Hz~3.98 MHz range
 Authors: Ma, Haijun1, 2 ; Feng, Mei2 ; Zhang, Jishu1
Author affiliation: 1  College of Life Science, Northwest A and F University, Yangling, Shannxi 712100, China
2  College of Agronomy, Ningxia University, Yinchuan 750021, 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: 41
 Issue: 11
 Issue date: November 2010
 Publication year: 2010
 Pages: 105-109
 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 change law of dielectric properties on Fuji apple superficial scald which stored at constant temperature was investigated. The mechanisms that reflected internal quality of fruit using dielectric properties were discussed so as to provide a new theoretical basis for nondestructive inspection and research methods to distinguish between diseased and normal fruits based on electrical properties. The fruits' dielectric properties, which embraced the impedance, reactance, conductance, capacitance and loss coefficient, were determined with going up frequency from 100 Hz to 3.98 MHz at (20±1)°C by applying LCR electronic measure instrument. The results showed that with the frequency increasing, fruit impedance and reactance were decreased; the capacitance and dielectric loss coefficient were changed irregularly, while the conductance was increased in spiral form under same storage times. There was a significantly positive correlation between impedance and reactance, the value of capacitance were significantly different (P<0.01) between the diseased and normal fruits from 100 Hz to 3.98 MHz. The research revealed that the capacitance could reflect the quality of apples in some extent.
 Number of references: 26
 Main heading: Fruits
Controlled terms: Capacitance  -  Cascades (fluid mechanics)  -  Dielectric losses  -  Electric conductivity
Uncontrolled terms: Apples  -  Constant temperature  -  Electrical property  -  Fuji apple  -  Internal quality  -  Loss coefficients  -  Non destructive inspection  -  Positive correlations  -  research methods  -  Superficial scald   -  Theoretical basis
Classification code: 631.1 Fluid Flow, General  -  701.1 Electricity: Basic Concepts and Phenomena  -  708.1 Dielectric Materials  -  821.4 Agricultural Products
 DOI: 10.3969/j.issn.1000-1298.2010.11.020
 Database: Compendex