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  2011年第42卷第3期共收录45篇
1.Accession number: 20111913966223
 Title: Effect on activity of immobilized cellulase by ultrasound assisted pretreatmentw
Authors: Wang, Zhenbin1 ; Zhang, Jie1, 2 ; Wang, Shiqing2 ; Ma, Haile1 ; Wang, Qianqian2 ; Chen, Xiaoyin1
Author affiliation: 1  College of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
2   College of Food Science and Engineering, Qingdao Agricultural University, Qingdao 266109, China
 Corresponding author: Wang, Z. (wzhb@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year: 2011
 Pages: 150-155
 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: Immobilized cellulase was pretreated by ultrasound. Based on the single factor and response surface methodology, the effects of ultrasonic parameters, such as ultrasonic time, ultrasonic frequency and ultrasonic power, as well as enzymolytic temperature and pH value of CMCNa buffer solution after pretreated were investigated. A mathematical model was established and analyzed to describe the relationships between the studied factors and enzyme activity. The optimum treatment parameters were as follows: enzymolytic temperature of 58.73°C, pH value of CMCNa buffer solution of 3.0, ultrasonic time of 16.88 min, ultrasonic frequency of 22.33 kHz and ultrasonic power of 26.77 W. Under the optimum conditions, enzyme activity of immobilized cellulose increased by 9.75%.
 Number of references: 13
 Main heading: Ultrasonics
Controlled terms: Catalysts  -  Enzyme activity  -  Enzyme immobilization  -  Enzymes  -  Mathematical models  -  pH effects  -  Surface properties  -  Ultrasonic waves
Uncontrolled terms: Buffer solutions  -  Cellulase  -  Immobilization of enzymes  -  Optimum conditions  -  pH value  -  Response surface methodology  -  Treatment parameters  -  Ultrasonic frequency  -  Ultrasonic parameters  -  Ultrasonic power   -  Ultrasound
Classification code: 951 Materials Science  -  921 Mathematics  -  804.1 Organic Compounds  -  804 Chemical Products Generally  -  803 Chemical Agents and Basic Industrial Chemicals  -  801.2 Biochemistry  -  801.1 Chemistry, General  -  753.1 Ultrasonic Waves  -  461 Bioengineering and Biology
 Database: Compendex

2. Accession number: 20111913966204
 Title: Simulation of soil water distribution under vertical line source infiltration
 Authors: Li, Shuqin1 ; Wang, Quanjiu1
Author affiliation: 1  Institute of Water Resources, 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:42
 Issue:3
 Issue date: March 2011
 Publication year: 2011
 Pages: 51-57
 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 the theory of unsaturated soil water dynamics, the soil water distribution under vertical line source infiltration was analyzed by the software Hydrus-2D. The model was testified by the experiments and soil hydraulic parameters were estimated. The result showed that this model could be used to simulate soil water infiltration characteristics with certain accuracy. The characteristics of water distribution under line source irrigation were simulated concerning different irrigation technique factors. The results showed that, under the condition of line source irrigation, the shape of wetting patterns under different soil textures was similar, and the scale was different: the ratio between the maximum sand loam and clay loam's level wetting radius and sand's were 0.59 and 0.24, the ratios of vertical humid depth were 0.42 and 0.31; on the condition of different line source depth, the shape and scale of wetting patterns were similar, and the positions had great difference, when the depth increased 5 cm, the vertical humid depths of sand, sandy loam and clay loam were increasing by 6%, 11.5%, 16% separately; the length and the diameter of the line source had conspicuous influence on soil water distribution, the length had a major impact on the vertical humid depth, the diameter had a primary influence on horizontal wetting radius; when the initial water content was high, the water content in the same cross-section increased; in the same period of irrigation time, the wetting front distance of level and vertical increased with the increasing of initial water content.
 Number of references:11
 Main heading:Water content
Controlled terms:Computer simulation  -  Geologic models  -  Irrigation  -  Seepage  -  Soil mechanics  -  Soil moisture  -  Water supply systems  -  Wetting
Uncontrolled terms:Clay loams  -  HYDRUS-2D  -  Line sources  -  Numerical simulation  -  Sandy loams  -  Soil hydraulic parameters  -  Soil textures  -  Soil water  -  Soil-water distribution  -  Unsaturated soil   -  Vertical line source  -  Water distributions  -  Wetting fronts
Classification code: 931.2 Physical Properties of Gases, Liquids and Solids  -  821.3 Agricultural Methods  -  723.5 Computer Applications  -  483.1 Soils and Soil Mechanics  -  481.1 Geology  -  446.1 Water Supply Systems  -  444 Water Resources  -  441 Dams and Reservoirs; Hydro Development  -  407 Maritime and Port Structures; Rivers and Other Waterways
 Database:Compendex
   
3. Accession number: 20111913966238
 Title: Tool-path generation method for single point incremental forming
 Authors: Li, Min1 ; Zhang, Lichao1 ; Mo, Jianhua1 ; Yuan, Xuezhong1
Author affiliation: 1  State Key Laboratory of Material Processing and Die and Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China
 Corresponding author: Zhang, L. (dr.teac@gmail.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 224-228
 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 basis of characteristic analysis for the single point incremental forming (SPIF), the problems of current study of tool-path generation for SPIF process were proposed. Based on the proposed method, a new tool-path generation method for SPIF, and the suitable Z-constant tool-path generation were presented. This method was used in the specific process planning software AFS2, and was applied to the SPIF equipment developed by the Japanese Amino Corporation, and an excellent surface quality was gained in a forming practice. Finite element analysis and application results indicate that the proposed method is feasible to meet practical needs.
 Number of references:10
 Main heading:Finite element method
 Controlled terms:Aluminum sheet  -  Equipment  -  Machine tools
Uncontrolled terms:Characteristic analysis  -  Finite element analysis  -  Forming tool-path  -  Interference detection  -  Single point incremental forming  -  Surface qualities  -  Tool path generation
Classification code: 535.1 Metal Rolling  -  603.1 Machine Tools, General  -  901 Engineering Profession  -  921.6 Numerical Methods
 Database:Compendex
   
4. Accession number:20111913966209
Title:Influence on hydraulic performance of suction chamber with built-in baffles in centrifugal pump
 Authors:Mou, Jiegang1 ; Li, Si1 ; Xu, Mingyuan2 ; Zhao, Yongpan1 ; Jin, Jianbo1
Author affiliation: 1  College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
                   2  Supply Department, CNMC Nickel Co. Ltd., Beijing 100029, China
 Corresponding author:Mou, J. (mjg1963@126.com)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 80-84
 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 cause for the generation of prerotation and recirculation in the suction chamber was analyzed and the two-sided effect of prerotation on the hydraulic performance in centrifugal pump was pointed out. The effective solution was baffles built in suction chamber. With different physical parameters and placement of the baffles in suction chamber, CFD numerical simulation was applied to predict the performance variation trend of centrifugal pump. According to the performance curve and the flow state in the chamber, the optimum baffle came out: the radial length is D0/4 (inlet diameter), and the 3/4 length of chamber is the value of axial length for the baffle. And, two baffles should be put closed by the impeller. The prototype was designed for hydraulic modeling test. The result indicated that the performance of the new model is superior to the original one. The values of head and efficiency rose by 0.8 m and 1.7% at the design condition, relatively. Fluent numerical simulation with high accuracy could be applied in structural optimal design of centrifugal pump.
 Number of references:12
 Main heading:Pumps
Controlled terms:Centrifugal pumps  -  Computational fluid dynamics  -  Computer simulation  -  Hydraulic machinery  -  Hydraulics  -  Pumping plants  -  Structural design  -  Structural optimization
Uncontrolled terms:Hydraulic performance  -  Pre-rotation  -  Recirculation  -  Structure parameters of baffle  -  Suction chamber
Classification code: 921.5 Optimization Techniques  -  723.5 Computer Applications  -  632.2 Hydraulic Equipment and Machinery  -  632.1 Hydraulics  -  618.2 Pumps  -  446 Waterworks  -  408.1 Structural Design, General
 Database:Compendex
   
5. Accession number:20111913966232
 Title:Fine-grained simulation of the plant stem growth process
 Authors:Zhu, Qingsheng1 ; Huang, Wei1 ; Qu, Hongchun1 ; Huang, Qizhong2 ; Zheng, Min1
Author affiliation: 1  College of Computer Science, Chongqing University, Chongqing 400030, China
2  Chongqing Agricultural Science Institute, Chongqing 400055, China
 Corresponding author:Zhu, Q. (qszhu@cqu.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 192-196
 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 simulate the growth of plant stem, plant stem and branches were divided into fine grit, and the plant growth process was iterated by dividing the stem into tertiary structure of meristematic zone, elongation zone, maturation zone. The parametric L-systems theories were applied in simulating the geometry shape of the plant. This method can achieve a better result. For plant meristematic zone, three kinds of lateral bud factor of flower, subaxis, leaf were set to improve the controllability of different organs in plant growth. At last, the simulation experimental results showed that this method could reduce the complexity of parametric L-systems, and make the real simulation of plant's growth process and the phenomena of botany.
 Number of references:9
 Main heading:Plants (botany)
Uncontrolled terms:Lateral bud factor  -  Parametric L-systems  -  Plant growth simulation  -  Process fine-grained division  -  Simulation  -  Stem
 Classification code:461.9 Biology
 Database:Compendex
   
6. Accession number:20111913966236
Title:Dynamic property of reconstructed scroll profile based on first-order function of radius of curvature
 Authors:Liu, Tao1 ; Wu, Zaixin1 ; Rui, Zhiyuan2
Author affiliation: 1  School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2  Key Laboratory of Digital Manufacturing Technology and Application, Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China
 Corresponding author:Liu, T. (liutao1971@lut.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 213-218
 Language:Chinese
 ISSN:10001298
 CODEN:NUYCA3
 Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract: Scroll profile plays a key role in dynamic property of the machine. The scroll profiles were constructed by using normal-equidistant-line method based on baseline with the first-order function of radius of curvature in accordance with continuity conditions. The models of suction chamber, compressing chamber and discharge chamber were established based on the parameters of the baseline. The dynamic process of dynamic gas forces in a scroll compressor verse crank angle was obtained. The influence of the first-order curvature radius parameters on dynamic property was approached. The numerical simulation showed that the first-order curvature radius parameters of top scroll profile had significant effects on dynamic property of a scroll machine. Furthermore, the discontinuity of curvature radius of connecting point on the top first-order and involutes led to fluctuation and polarity change of radial force. Thus, the sealing force-load of radial clearance, leakage loss and bearing life would be influenced directly.
 Number of references:10
 Main heading:Scroll compressors
Uncontrolled terms:Dynamic property  -  First-order  -  Radial force  -  Radius of curvature  -  Scroll profile
 Classification code:618.1 Compressors
 Database:Compendex
   
7. Accession number:20111913966210
Title:Comparison on performance prediction methodologies of low-head pump systems based on CFD
 Authors:Zhang, Rentian1 ; Yue, Xiubin2 ; Zhu, Honggeng1 ; Yao, Linbi3
Author affiliation: 1  College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China
2  Jiangsu Water Supply Co. Ltd. for S-to-N Water Diversion Project, Nanjing 210029, China
3  Jiangsu Surveying and Design Institute of Water Resources Co. Ltd., Yangzhou 225009, China
 Corresponding author:Zhu, H. (hgzhu@163.com)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 85-90
 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 mixed-flow pumping system was selected as the study case based on CFD technologies. Two difference methodologies of flow field analysis and performance prediction were conducted. One method was that the system efficiency was the production of pump efficiency with passage efficiency obtained by separate numerical simulation of suction box and discharge passage without pump. The other one was based on the simulation of whole pumping system including the suction box, discharge passage and pump. The predicted results from the two different methodologies were compared with model system test results, which showed that the predicted errors were different. The error of pumping system efficiency was smaller when the numerical simulation of whole pumping system was adopted, while the error was much greater when the system efficiency was predicted by the production of passage efficiency with pump efficiency, approximately equal only near the best efficiency point. The larger errors in predicting pumping system efficiency for the first method were mainly caused by unreasonable theoretic foundation. Therefore, it is suggested that the suction box, discharge passage and pump should be taken as a whole in numerical simulation and performance prediction and the effect of pump should be considered in the optimal hydraulic design of suction box and discharge passage.
 Number of references:13
 Main heading:Pumps
Controlled terms:Computational fluid dynamics  -  Computer simulation  -  Efficiency  -  Errors  -  Forecasting  -  Mathematical models  -  Numerical methods  -  Pumping plants
Uncontrolled terms:Best efficiency point  -  CFD  -  Field analysis  -  Flow pumping  -  Hydraulic designs  -  Model system  -  Numerical simulation  -  Performance prediction  -  Predicted error  -  Pump efficiency   -  Pump system  -  Pumping system  -  Pumping systems  -  Study case  -  Suction box  -  System efficiency
Classification code:446 Waterworks  -  618.2 Pumps  -  723.5 Computer Applications  -  913.1 Production Engineering  -  921 Mathematics  -  921.6 Numerical Methods
 Database:Compendex
   
8. Accession number:20111913966233
 Title:Strategy and application of product innovation based on function incentive
 Authors:Sun, Qiying1 ; Li, Yan1 ; Li, Wenqiang1 ; Chen, Weimin1
Author affiliation: 1  School of Manufacturing Science and Engineering, Sichuan University, Chengdu 610065, China
 Corresponding author:Li, Y. (liyan@scu.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 197-202
 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 templates were given based on the structures and variables of a product in creativity templates. As a product has various structures and variables are determined subjectively, the multifarious and nonstandard data add to the difficulties of product innovation. Therefore a new type of product innovation method based on function incentive was put forward. Function common basis was inducted to this model. All product information was represented by the product function model systematically and normatively. Each product sub-function was operated by function dependency, function transformation, function displacement, function relocation and function random excitation strategies. Designer was assisted systematically and directionally to carry out innovative thinking. And the product creative design was realized. Finally, the design process of an agricultural knapsack sprayer was described to demonstrate this model.
 Number of references:15
 Main heading:Product design
 Controlled terms:Innovation  -  Structural design
Uncontrolled terms:Design process  -  Function transformation  -  Innovation strategy  -  Innovative thinking  -  Product creative design  -  Product functions  -  Product information  -  Product innovation  -  Random excitations
Classification code:408.1 Structural Design, General  -  912 Industrial Engineering and Management  -  913.1 Production Engineering
 Database:Compendex
   
9. Accession number:20111913966203
Title:Relationships between soil particle size distribution and soil physical properties based on multifractal
 Authors:Guan, Xiaoyan1 ; Yang, Peiling2 ; Lü, Ye1
Author affiliation: 1  Department of Irrigation and Drainage, China Institute of Water Resources and Hydropower Research, Beijing 100048, China
2  College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, China
 Corresponding author:Guan, X. (guanxy@iwhr.com)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 44-50
 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 describe the relationship between soil particle size distribution and soil physical properties, the parameters of soil particle size distribution, soil bulk density and soil saturated hydraulic conductivity were measured, and the heterogeneity of soil particle size distribution was characterized by the parameters of multifractal spectrum, and then the relationship between multifractal parameters of soil particle size distribution and soil bulk density, soil saturated hydraulic conductivity were discussed. The results showed that the heterogeneity of soil particle size distribution could be reflected by the multifractal parameters of soil particle size distribution such as D1/D0 and Δα, the multifractal parameters were closely related with soil clay content, and when the soil heterogeneity is larger, the soil clay content is higher, and that results in soil bulk density increasing, soil saturated hydraulic conductivity decreasing. Therefore, the multifractal parameters of soil parameters can be used as an indicator to reflect the soil physical properties.
 Number of references:16
 Main heading:Particle size
Controlled terms:Fractals  -  Hydraulic conductivity  -  Particle size analysis  -  Size distribution  -  Soils
Uncontrolled terms:Multi fractals  -  Multi-fractal spectrum  -  Multifractal parameters  -  Saturated hydraulic conductivity  -  Soil bulk density  -  Soil clay content  -  Soil heterogeneity  -  Soil parameters  -  Soil particle size  -  Soil physical property
Classification code:423 Non Mechanical Properties and Tests of Building Materials  -  483.1 Soils and Soil Mechanics  -  632.1 Hydraulics  -  921 Mathematics  -  943.2 Mechanical Variables Measurements  -  951 Materials Science
 Database:Compendex
   
10. Accession number:20111913966213
Title:Biomass oxygen enriched-steam gasification in an atmospheric fluidized bed for syngas production
Authors:Su, Deren1, 2 ; Zhou, Zhaoqiu1 ; Xie, Jianjun1 ; Lang, Lin1 ; Yin, Xiuli1 ; Wu, Chuangzhi1
Author affiliation: 1  Guangzhou Institute of Energy Conversion, Chinese Acad. of Sci., Guangzhou 510640, China
2  Graduate University of Chinese Acad. of Sci., Beijing 100049, China
 Corresponding author:Yin, X. (xlyin@ms.giec.ac.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 100-104
 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: Biomass gasification with steam-oxygen enriched air in an atmospheric fluidized bed gasifier was studied. The gasifier was 9m high with the bed diameter of 0.5m. Sawdust with different moisture contents was used as feedstock, and it was fed into the gasifier at flow rates of 180~270 kg/h. The effects of equivalence ratio, steam to biomass ratio, secondary flow ratio and feedstock moisture on the bed temperature, gas compositions, tar content, lower heating values, gas yield, carbon conversion efficiency and cold gas efficiency were investigated. The results showed under the operating conditions of ER is 0.25~0.27 and S/B=0.4, the following syngas was obtained: H2 content of 28.7%, H2/CO ratio of 0.94, low heating value of 9.9 MJ/m3, cold gas efficiency was more than 75%, carbon conversion efficiency was more than 97%; a second flow ratio of 25% at the ER of 0.29 can significantly reduce the tar content to 49mg/m3, but hardly improve the quality of the gas produced; the rise of the feedstock moisture content caused a significant increase in CO2 content and a reduction in H2 and CO contents, and the moisture content is expected not to exceed 20%.
 Number of references:12
 Main heading:Gasification
Controlled terms:Biomass  -  Conversion efficiency  -  Efficiency  -  Feedstocks  -  Fluidization  -  Fluidized beds  -  Heating  -  Moisture  -  Moisture determination  -  Oxygen   -  Steam  -  Synthesis gas  -  Tar
Uncontrolled terms:Atmospheric fluidized bed  -  Bed temperature  -  Biomass Gasification  -  Biomass ratio  -  Co content  -  Cold gas efficiency  -  Equivalence ratios  -  Flow ratios  -  Gas compositions  -  Gas yields   -  Gasifiers  -  Low heating values  -  Lower heating value  -  Moisture contents  -  Operating condition  -  Oxygen enriched air  -  Oxygen-enriched  -  Steam gasification  -  Syn-gas  -  Syngas production
Classification code:  913.1 Production Engineering  -  804 Chemical Products Generally  -  802.3 Chemical Operations  -  802.1 Chemical Plants and Equipment  -  944.2 Moisture Measurements  -  801.4 Physical Chemistry  -  614 Steam Power Plants  -  525.5 Energy Conversion Issues  -  525.1 Energy Resources and Renewable Energy Issues  -  643.1 Space Heating
 Database:Compendex
   
11. Accession number:20111913966212
 Title:Flow analysis and measurement of wastewater treatment mixer with dome
 Authors:Shi, Weidong1 ; Tian, Fei1 ; Chen, Bin1, 2
Author affiliation: 1  Technical and Research Center of Fluid Machinery Engineering, Jiangsu University, Zhenjiang 212013, China
                   2  Nanjing Lanshen Pump Co. Ltd., Nanjing 211500, China
 Corresponding author:Shi, W. (wdshi@ujs.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 96-99
 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 performance of wastewater-treatment mixer because of its large application in the rural environmental governance, based on CFD, using Fluent 6.3, wastewater treatment mixer with dome was simulated. At the same time, the velocity flow field distribution in the wastewater treatment pool was experimentally studied, and the fluid velocity at the different points of the pool was measured by using the velocity instrument. The velocity distribution graphs of the different sections in the wastewater treatment pool were drawn by software Excel, and the velocity distribution rule was analyzed. The same results were obtained by the numerical simulation and experiment. The fluid flow obviously transferred along the axial direction of wastewater-treatment mixer but little diffused along the radial direction, and fluid velocity symmetrical along the mixer axis. The results indicate that the wastewater-treatment mixer can guide flow in axial direction, and can reduce the effect of boundary of pool wall on the fluid in pool.
 Number of references:6
 Main heading:Wastewater treatment
Controlled terms:Computational fluid dynamics  -  Computer simulation  -  Domes  -  Experiments  -  Flow of fluids  -  Fluids  -  Lakes  -  Mathematical models  -  Mixers (machinery)  -  Mixing   -  Reclamation  -  Velocity  -  Velocity control  -  Velocity distribution  -  Wastewater  -  Water treatment plants
Uncontrolled terms:Axial direction  -  Flow analysis  -  Fluid flow  -  Fluid velocities  -  Numerical simulation  -  Radial direction  -  Velocity flow
Classification code:931.3 Atomic and Molecular Physics  -  931.1 Mechanics  -  921 Mathematics  -  901.3 Engineering Research  -  802.3 Chemical Operations  -  802.1 Chemical Plants and Equipment  -  731.3 Specific Variables Control  -  723.5 Computer Applications  -  452.4 Industrial Wastes Treatment and Disposal  -  452.3 Industrial Wastes  -  446.1 Water Supply Systems  -  408.2 Structural Members and Shapes  -  407 Maritime and Port Structures; Rivers and Other Waterways
 Database:Compendex
   
12. Accession number:20111913966199
Title:Spray characteristics of pressure-swirl nozzle at different ambient pressures of combustion chamber
Authors:Liu, Taotao1 ; Zhang, Wugao1 ; Chen, Xiaoling1 ; Gu, Genxiang2 ; Guo, Xiaoning2 ; Huang, Zhen1
Author affiliation: 1  Center for Combustion and Environmental Technology, Shanghai Jiaotong University, Shanghai 200240, China
2 Shanghai Micro Powers Ltd., Shanghai 201203, China
  Corresponding author:Zhang, W. (zhangwg@sjtu.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 21-25
 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:The spray characteristics of pressure-swirl nozzle used in Stirling engine was studied by way of the experiment under high ambient pressures (up to 2.8 MPa). The high-speed video imaging technique, FAM (Fraunhofer and Mie) laser drop size analyzer, and PIV (particle image velocimetry) test equipment were used for experimental measurements. Experimental results showed that the spray structure at higher ambient pressure was more compact. The vortex cloud was found at the leading edge at high ambient pressure. Spray cone angle was independent of ambient pressure after a value between 1.0~1.5 MPa. The Sauter mean diameter (SMD) and the drop velocity became larger at high ambient pressure conditions. Finally, a vortex was found in the center of the spray and this region moved to the downstream of the spray as the ambient pressure increased.
 Number of references:5
 Main heading:Spray nozzles
Controlled terms:Combustion chambers  -  Imaging techniques  -  Stirling engines  -  Velocity control  -  Velocity distribution  -  Velocity measurement  -  Vortex flow
Uncontrolled terms:Ambient pressures  -  Drop size  -  Drop velocity  -  Experimental measurements  -  Fraunhofer  -  High ambient pressure  -  High-speed video  -  Leading edge  -  Particle image velocimetries  -  Pressure-swirl nozzle   -  Sauter mean diameters  -  SMD  -  Spray angle  -  Spray characteristics  -  Spray cone angle  -  Spray structure  -  Test equipments
Classification code:943.2 Mechanical Variables Measurements  -  746 Imaging Techniques  -  741 Light, Optics and Optical Devices  -  943.3 Special Purpose Instruments  -  731.3 Specific Variables Control  -  641.1 Thermodynamics  -  631.1 Fluid Flow, General  -  654.2 Rocket Engines
 Database:Compendex
   
13. Accession number:20111913966225
 Title:Apple attitude estimation based on particle filter for harvesting robot
 Authors:Zhou, Jun1 ; Zhang, Gaoyang1 ; Liu, Rui1 ; Jin, Yue1
Author affiliation: 1  College of Engineering, Nanjing Agricultural University, Nanjing 210031, China
 Corresponding author:Zhou, J. (zhoujun@njau.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 161-165
 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 harvesting damages and failures caused by the absence of attitude information in the current apple harvesting robot, the method of measuring apple attitude was put forward with the machine vision, and the optimal estimation of apple attitude was carried out based on the particle filter in real time. A camera was fixed on the robotic gripper, in the process of picking the camera vision field was controlled to cover the expected fruit target, and a series of apple images were sampled randomly. The algorithms of the inertial axis and the center offset were applied to calculate the apple attitude at the robotic coordinate according to the each apple image. Finally, the attitude data extracted from many apple images was fused with the particle filter, and the optimal estimation of the apple attitude was obtained. The experimental results showed that the multiple information of apple attitude was fused successfully, and the measurement error of apple attitude was decreased effectively.
 Number of references:9
 Main heading:Fruits
Controlled terms:Agricultural machinery  -  Cameras  -  Computer vision  -  Estimation  -  Harvesting  -  Nonlinear filtering  -  Optimization  -  Robotics  -  Robots
Uncontrolled terms:Agricultural robot  -  Apple  -  Attitude estimation  -  Camera vision  -  Harvesting robot  -  Machine vision  -  Optimal estimations  -  Particle filter  -  Real time  -  Robotic grippers
Classification code:731 Automatic Control Principles and Applications  -  742.2 Photographic Equipment  -  821 Agricultural Equipment and Methods; Vegetation and Pest Control  -  921 Mathematics  -  921.5 Optimization Techniques
 Database:Compendex
   
14. Accession number:20111913966218
 Title:Vibration and impact performance tests of cherry tomato transport packages
Authors:Zhang, Lianwen1 ; Yang, Chuanmin1 ; Wang, Yong1 ; Pan, Daojin1 ; Meng, Xianwen1 ; Tong, Tong1
Author affiliation: 1  School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China
 Corresponding author:Zhang, L. (zlianwen@263.net)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 125-130 155
 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 main packing form and damage of cherry tomatoes in storage and transportation process in nowadays, the main reasons for the damage of cherry tomatoes package were studied. By choosing a kind of typical cherry tomato packages in the circulation market, five real tests, which included sinusoidal vibration test at variable frequency, vertical impact and dropping tests as well as stacking strength test and vibration transmissibility of multi-packages stacking test, were carried out according to the national test standards. Through sinusoidal vibration test at variable frequency on the single layer package and stacking strength test, the resonance frequency and maximal stacking layers were determined respectively: the natural frequency of a single package was 26.61 Hz and the maximal stacking layer was 9. Then, the natural frequencies of every layer package were determined by 9 stacking layers vibration transmissibility experiment at variable frequency, and they were 36.61, 10.76 and 6.44 Hz for the bottom, middle and top layers respectively. Curves of acceleration and vibration transmissibility of every layer package vs time were obtained. The relationships of its natural frequency and peak value of vibration transmissibility vs stack height were discussed. On the basis of the above, the fragility of each package was 89.58 by carrying out the vertical impact test. Also, the allowable maximal dropping height is 580 mm according to the dropping test. Finally, the protection capability of the packages on cherry tomatoes was evaluated and some suggestions were also given.
 Number of references:19
 Main heading:Testing
 Controlled terms:Experiments  -  Fruits  -  Natural frequencies  -  Real variables
Uncontrolled terms:Cherry tomato  -  Dropping tests  -  Impact performance  -  Impact test  -  Peak values  -  Resonance frequencies  -  Single layer  -  Sinusoidal vibration  -  Stacking  -  Stacking layers   -  Storage and transportation process  -  Strength tests  -  Test standards  -  Transport package  -  Variable frequencies  -  Vibration transmissibility
Classification code:423.2 Non Mechanical Properties of Building Materials: Test Methods  -  711.1 Electromagnetic Waves in Different Media  -  821.4 Agricultural Products  -  901.3 Engineering Research  -  921 Mathematics
 Database:Compendex
   
15. Accession number:20111913966215
 Title:Sugarcane leaves dry anaerobic fermentation
Authors:Wang, Jinli1 ; Jiao, Jing1 ; Zhang, Jin1 ; Deng, Yiguo1 ; Zheng, Yong1 ; Wang, Gang1
Author affiliation: 1  Institute of Agricultural Machinery, Chinese Academy of Tropical Agricultural Sciences, Zhanjiang 524091, China
 Corresponding author:Zhang, J. (Zj1204@tom.com)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 109-114
 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 transform a large number of abandoned sugarcane leaves into biogas energy, dry anaerobic fermentation method and the fermented materials with total solid content of 20% were used in the experiments. The effects of different inoculum concentrations, grass-manure ratios and fermentation temperatures on the biogas yield and methane content were analyzed. Results showed that the fermentation could work normally when inoculum concentration was 30% and 40%. The 40% inoculum concentration had the highest total gas production, but the methane content decreased rapidly during the fermentation anaphase. When grass-manure ratio was 1:1 and 2:1, maximum total gas production was obtained, with methane content more than 60%, and the gas production efficiency was significantly higher than the efficiency obtained when grass-manure ratio was 1:0. Maximum total gas production and methane content were obtained at the fermentation temperature of 35°C. There was little difference in total gas production when the fermentation temperature was at 30°C and 40°C. The best results of dry anaerobic fermentation of sugarcane leaves were obtained for an optimum processing parameters combination of 30% inoculum concentration, 1:1 grass-manure ratio and 35°C fermentation temperature. For all the treatment groups, there was a strong linear correlation between methane content and fermentation time before the methane content reached the highest value. The decrease in methane content was not obvious though the daily biogas yields decreased significantly after the peak of gas production.
 Number of references:16
 Main heading:Fermentation
Controlled terms:Biogas  -  Gases  -  Manures  -  Methanation  -  Methane  -  Molasses
Uncontrolled terms:Anaerobic fermentation  -  Biogas energy  -  Fermentation temperature  -  Gas productions  -  Linear correlation  -  Methane content  -  Optimum processing  -  Total solid content  -  Treatment group
Classification code:452.3 Industrial Wastes  -  522 Gas Fuels  -  802.2 Chemical Reactions  -  822.3 Food Products  -  931.2 Physical Properties of Gases, Liquids and Solids
 Database:Compendex
   
16. Accession number:20111913966201
 Title:Energy-saving potential and influencing factors for hydraulic hybrid wheel loader
 Authors:Shi, Rongling1, 2 ; Zhao, Jiyun1 ; Sun, Hui3
Author affiliation: 1  School of Machine and Electrical Engineering, China University of Mining and Technology, Xuzhou 221008, China
2  Xuzhou Agriculture Machinery Technique Extending Station, Xuzhou 221006, China
3  Jiangsu Xuzhou Construction Machinery Research Institute, Xuzhou 221004, China
 Corresponding author:Shi, R. (xznjtmissshi@163.com)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 31-35
 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: According to the operating characteristics of wheel loaders, the energy distribution and saving potential of loader were researched through calculation and simulation. Combing the characteristics of hydraulic hybrid system, the parallel configuration of hydraulic hybrid wheel loader was presented, and the influencing factors for hydraulic hybrid wheel loader energy-saving potential were analyzed. Finally, the key parameters were optimized. The results show that optimization of hydraulic hybrid power system, selection of the appropriate parameters in control strategy, recovering the braking energy and long slope potential energy of loaders are helpful to improve the energy saving effect of hydraulic hybrid loader.
 Number of references:14
 Main heading:Loaders
Controlled terms:Construction equipment  -  Energy conservation  -  Hybrid systems  -  Hydraulics  -  Mining machinery  -  Optimization  -  Wheels
Uncontrolled terms:Braking energy  -  Energy distributions  -  Energy saving  -  Energy saving potential  -  Energy-saving effect  -  Hydraulic hybrids  -  In-control  -  Influencing factor  -  Key parameters  -  Operating characteristics   -  Parallel configuration  -  Saving potentials  -  Wheel loaders
Classification code:921.5 Optimization Techniques  -  921 Mathematics  -  632.1 Hydraulics  -  601.2 Machine Components  -  525.2 Energy Conservation  -  502.2 Mine and Quarry Equipment  -  405.1 Construction Equipment
 Database:Compendex
   
17. Accession number:20111913966228
 Title:Defect detection of muskmelon based on texture features and color features
 Authors:Wang, Shuzhi1 ; Zhang, Jianhua2 ; Feng, Quan3
Author affiliation: 1  College of Electrical Engineering, Northwest University for Nationalities, Lanzhou 730030, China
2  College of Engineering, China Agricultural University, Beijing 100083, China
3  College of Engineering, Gansu Agricultural University, Lanzhou 730070, China
 Corresponding author:Feng, Q. (fquan@sina.com)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 175-179
 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 of muskmelon's defect detection, an automatic defect detection system based on support vector machine (SVM) was set up by adopting complex features of texture and color. Four textural parameters and twelve color features of combinations from RGB were tested for the discriminability in stem, calyx, bruise and mildew. Through the experiments, two textural and four color features with good discriminability were selected and treated as the complex features. The results indicated that with the complex features and SVM, the accuracy of classification on muskmelons was up to 92.2%.
 Number of references:14
 Main heading:Color
 Controlled terms:Defects  -  Textures
Uncontrolled terms:Color features  -  Defect detection  -  Melon  -  SVM  -  Texture features
Classification code:423 Non Mechanical Properties and Tests of Building Materials  -  741.1 Light/Optics  -  933 Solid State Physics  -  951 Materials Science
 Database:Compendex
   
18. Accession number:20111913966220
Title:Design of online measurement system of infrared radiation drying for fruits and vegetables
 Authors:Wang, Xiangyou1 ; Lin, Xi'na1 ; Liu, Qiang1
Author affiliation: 1  School of Agricultural and Food Engineering, Shandong University of Technology, Zibo 255049, China
 Corresponding author:Wang, X. (wxy@sdut.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 136-139 191
 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 fruit and vegetable infrared drying online real-time detecting system was designed. Using the quality sensor, the AD temperature sensor, the PCI8310 data acquisition card and so on, the data of fruits and vegetables in the drying equipment were stored in PC. These data were processed and visualized by the program written by the Visual Basic, and then, drying curves, radiation temperature variation curves and material temperature variation curves were generated. The detecting experiment results showed that the online detection error was within ±0.03% and the characteristics were displayed accurately and timely.
 Number of references:11
 Main heading:Infrared drying
Controlled terms:Curing  -  Design  -  Drying  -  Error detection  -  Fruits  -  Infrared radiation  -  Sensors  -  Temperature distribution  -  Thermal processing (foods)  -  Vegetables
Uncontrolled terms:Data acquisition cards  -  Drying curves  -  Drying equipment  -  Fruit and vegetables  -  Material temperature  -  On line measurement system  -  On-line detection  -  Online detecting  -  Radiation temperature  -  Real-time detecting system   -  VISUAL BASIC
Classification code:822.2 Food Processing Operations  -  821.4 Agricultural Products  -  815.1 Polymeric Materials  -  801 Chemistry  -  741.1 Light/Optics  -  721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory  -  642.1 Process Heating  -  641.1 Thermodynamics  -  408 Structural Design
 Database:Compendex
   
19. Accession number:20111913966235
 Title:Dither compensation technology for hysteresis of 2D digital valve
 Authors:Li, Sheng1 ; Ruan, Jian1 ; Meng, Bin1
Author affiliation: 1  Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Ministry of Edu., Zhejiang University of Technology, Hangzhou 310014, China
 Corresponding author:Ruan, J. (wxmin@mail.hz.zj.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 208-212 218
 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 mathematical model of 2D digital valve was established and its hysteresis characteristics was first simulated and analyzed. In order to diminish and even eliminate hysteresis, a dither compensation technology which used high frequency dither signal to superimpose on input signal was proposed. Then the special test rig was built and experimental study was carried out. The experimental results revealed that when dither amplitude was 25%, 50% and 100% of backlash magnitude respectively, the hysteresis width accordingly reduced from 2.2% to about 1.7%, 1.1% and 0.5% of backlash magnitude respectively. It is finally concluded that the proposed dither compensation approach can diminish and even eliminate hysteresis of 2D digital valve effectively.
Number of references:9
 Main heading:Hysteresis
 Controlled terms:Computer simulation  -  Mathematical models
Uncontrolled terms:2D digital valve  -  Backlash  -  Compensation technology  -  Dither  -  Dither signals  -  Experimental studies  -  High frequency  -  Hysteresis characteristics  -  Input signal  -  Test rigs
Classification code:723.5 Computer Applications  -  921 Mathematics  -  961 Systems Science
 Database:Compendex
   
20. Accession number:20111913966226
 Title:Identification of tipcap of agricultural kernel based on Harris algorithm
 Authors:Yang, Shuqin1 ; Ning, Jifeng2 ; He, Dongjian1
Author affiliation: 1  College of Mechanical and Electronic Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
2  College of Information Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
 Corresponding author:He, D. (hdj168@nwsuaf.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 166-169
 Language:Chinese
 ISSN:10001298
 CODEN:NUYCA3
 Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract: By analyzing morphological feature of tipcap of agricultural kernel, a tipcap identification algorithm based on Harris corner detector was developed. Harris algorithm detected the corner within a local region. As the most obvious corner structure, the tipcap had the maximal response to Harris corner detector, which made it can detect the kernels without the obvious tipcap accurately. The kernels with tipcap of corn, pumpkin and summer squash were selected for the test. The experimental results on 750 kernels showed that the proposed method got overall accuracy of 95.6% for tipcap of kernels.
 Number of references:12
 Main heading:Algorithms
 Controlled terms:Detectors  -  Image processing  -  Imaging systems
Uncontrolled terms:Agricultural kernel  -  Harris algorithm  -  Harris corner detector  -  Identification algorithms  -  Local region  -  Morphological features  -  Summer squash  -  Tipcap
Classification code:723 Computer Software, Data Handling and Applications  -  741 Light, Optics and Optical Devices  -  746 Imaging Techniques  -  914 Safety Engineering  -  921 Mathematics
 Database:Compendex
   
21. Accession number:20111913966237
Title:Modeling of machined joints normal stiffness using modified PSO-BP neural network algorithm
Authors:Yang, Hongping1 ; Fu, Weiping1 ; Shi, Biao2 ; Wang, Wen1 ; Yang, Shiqiang1 ; Wang, Wei1
Author affiliation: 1  Faculty of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, China
2  Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an 710048, China
 Corresponding author:Yang, H. (yanghp8@sohu.com)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 219-223 233
 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 forecasting accuracy of the normal contact stiffness of machined joints, the modified particle swarm optimizer (MPSO) algorithm was proposed. The BP neural network parameters were optimized by the MPSO algorithm. The normal contact stiffness of machined joints was forecasted under different experimental conditions, and the relative errors were analyzed. The results showed that the forecast precision could reach to 92%, and the contact stiffness of machined joints was modeled for various affecting factors.
 Number of references:16
 Main heading:Neural networks
 Controlled terms:Algorithms  -  Stiffness
Uncontrolled terms:Affecting factors  -  BP neural networks  -  Contact stiffness  -  Experimental conditions  -  Forecast precision  -  Forecasting accuracy  -  Machined joints  -  Modified PSO  -  MPSO algorithm  -  Normal stiffness   -  Particle swarm optimizers  -  Relative errors
Classification code:421 Strength of Building Materials; Mechanical Properties  -  422 Strength of Building Materials; Test Equipment and Methods  -  723 Computer Software, Data Handling and Applications  -  723.4 Artificial Intelligence  -  921 Mathematics  -  951 Materials Science
 Database:Compendex
   
22. Accession number:20111913966222
Title:Non-destructive detection of kiwifruit firmness based on near-infrared diffused spectroscopy
 Authors:Liu, Hui1 ; Guo, Wenchuan1 ; Yue, Rong1
Author affiliation: 1  College of Mechanical and Electronic Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
 Corresponding author:Guo, W. (guowenchuan69@126.com)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 145-149
 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 explore a non-destructive method in identifying kiwifruit ripeness, a near infrared diffused spectroscopy technology was used to determine firmness of Huayou kiwifruits during cool storage. Partial least squares (PLS) regression was carried out to analyze the spectroscopy. Four different spectral pretreatment methods were used to compare calibration results for firmness. The result showed that the best calibration models, in the whole wavelength range, could be obtained by the first derivative spectrum with the correlation coefficient of calibration of 0.963 and the correlation coefficient of prediction of 0.852.
 Number of references:13
 Main heading:Infrared devices
 Controlled terms:Calibration  -  Near infrared spectroscopy
Uncontrolled terms:Firmness  -  Kiwifruit  -  NIR spectroscopy  -  Non-destructive detection  -  PLS
Classification code:741.3 Optical Devices and Systems  -  941 Acoustical and Optical Measuring Instruments  -  942 Electric and Electronic Measuring Instruments  -  943 Mechanical and Miscellaneous Measuring Instruments  -  944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments
 Database:Compendex
   
23. Accession number:20111913966211
 Title:Experiment of PXSB two-ways step running complete fluidic rain gun
 Authors:Li, Hong1 ; Wang, Chao1 ; Yang, Yancai2 ; Chen, Chao1
Author affiliation: 1  Technical and Research Center of Fluid Machinery Engineering, Jiangsu University, Zhenjiang 212013, China
2  Nihon KOSO Co. Ltd., Wuxi 214072, China
 Corresponding author:Li, H. (hli@ujs.edu.cn)
 Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 91-95 149
 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:PXSB two-ways step running complete fluidic rain gun is a new type of large-middle rotary sprinkler. The key component of the sprinkler, fluidic element, provides the driving force and controls the movement of the sprinkler based on Coanda effect. Hydraulic performance of the rain gun was tested. The main influencing factors to the range, height and rainfall distribution were analyzed. The influences of the working pressure and the structure parameters on the main hydraulic performance of the rain gun under its working states have been obtained by the experiments. The best geometrical size was achieved at the experiments, which provided a basis in building the design method of the two-ways step running complete fluidic rain gun. A comparison of hydraulic performance was made between the complete fluidic rain gun and the other large-middle rotary sprinkler. According to the results, the two-ways step running complete fluidic rain gun has better performance than the others.
 Number of references:11
 Main heading:Rain
 Controlled terms:Experiments  -  Hydraulics
Uncontrolled terms:Coanda effects  -  Design method  -  Driving forces  -  Geometrical sizes  -  Hydraulic performance  -  In-buildings  -  Influencing factor  -  Key component  -  Rainfall distribution  -  Sprinkler   -  Structure parameter  -  Two-ways step running  -  Working pressures  -  Working state
Classification code:443.3 Precipitation  -  632.1 Hydraulics  -  901.3 Engineering Research
 Database:Compendex
   
24. Accession number:20111913966206
 Title:Modern design theory and method of rice transplanter
 Authors:Zhao, Yun1 ; Zhao, Xiong1 ; Zhang, Weiwei1 ; Dai, Li1
Author affiliation: 1  Faculty of Mechanical Engineering and Automation, Zhejiang Sci.-Technol. University, Hangzhou 310018, China
 Corresponding author:Zhao, Y. (zhaoyun@zstu.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 65-68 43
 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: Exploratory research on the optimization of transplanting mechanism, which is the key working component of the rice transplanter, three methods to establish the theoretical models have been proposed. In the process of building models, circuit simulation method is applied to solve the elastic dynamic problems which are caused by impact loads. As to the process of fetching seedlings which is difficult to build models by using theoretical deduction, firstly establish the numerical model by test measurement, then inlay this numerical model into the general theoretical model. The reliability of the general theoretical model is proved by measuring bearing force of transplanting mechanism in the test-bed experiment. Through high-speed camera, the relation between the motion of seedling-pushing rod and the rotation angle of planet carrier can be measured, and this relation can prove the correctness of differential equations of seedling-pushing mechanism. A method that can solve the complicated multiple object optimization problems which are strong coupled, dizzy and nonlinear has been proposed. It's called the method of optimization guided by parameters' modification. And the theoretical model of this method has been established. A software with functions of optimization, virtual manufacture, virtual trial and test has been compiled basing on VB platform. The function of parameters' modification guiding optimization has been added to this software on the foundation of numeralization of the objective function.
 Number of references:14
 Main heading:Optimization
Controlled terms:Circuit simulation  -  Design  -  Differential equations  -  Numerical methods
Uncontrolled terms:Method of optimization guided by parameters' modification  -  Modern design method  -  Rice transplanter  -  Theoretical model  -  Transplanting mechanism
Classification code:408 Structural Design  -  703.1.1 Electric Network Analysis  -  921 Mathematics
 Database:Compendex
   
25. Accession number:20111913966239
 Title:Effects of the ultrasonic vibration on dimensional accuracy in micro milling
 Authors:Shen, Xuehui1, 2 ; Zhang, Jianhua1 ; Xing, Dongliang1 ; Dong, Chunjie1
Author affiliation: 1  College of Mechanical Engineering, Shandong University, Ji'nan 250061, China
2  College of Mechanical Engineering, Shandong Institute of Light Industry, Ji'nan 250353, China
 Corresponding author:Zhang, J. (jhzhang@sdu.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 229-233
 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 purpose is to investigate the effects of the ultrasonic vibration on dimensional accuracy in micro milling process. Several slot-milling experiments were conducted with aluminium alloy as the workpiece material. The desired vibration was proposed from the workpiece side by an ultrasonic vibrator. The width of slot produced by end milling was precisely measured. A one-factor experiment was conducted at first to analyze the variation of slot width before and after ultrasonic vibration was applied, and the experimental results indicated that ultrasonic vibration made contribution to the decrease of size deviation and larger amplitude tends to reduce the slot width oversize. A full-factor experiment was carried out accordingly based on Taguchi method to optimize the parameters involving spindle speed, feed per tooth and vibrating amplitude.
 Number of references:9
 Main heading:Vibration analysis
Controlled terms:Experiments  -  Micromachining  -  Milling (machining)  -  Taguchi methods  -  Ultrasonic effects  -  Ultrasonic waves  -  Ultrasonics
Uncontrolled terms:Aluminium alloys  -  Before and after  -  Dimensional accuracy  -  End milling  -  Micro milling  -  Milling  -  One-factor  -  Slot width  -  Spindle speed  -  Ultrasonic vibration   -  Vibrating amplitudes  -  Work pieces  -  Workpiece materials
Classification code:604.2 Machining Operations  -  753.1 Ultrasonic Waves  -  901.3 Engineering Research  -  913.3 Quality Assurance and Control  -  943.2 Mechanical Variables Measurements
 Database:Compendex
   
26. Accession number:20111913966197
 Title:Coolant temperature effect on LNG engine
 Authors:Deng, Yibin1, 2 ; Huang, Ronghua1 ; Wang, Zhaowen1 ; Cheng, Wei3
Author affiliation: 1  School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2  School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China
3  Commercial Vehicle Technical Center, Dongfeng Motor Co. Ltd., Wuhan 430056, China
 Corresponding author:Deng, Y. (dengyb@qq.com)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 11-14 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:Performance of the LNG (liquefied natural gas) engine was tested on overall conditions at four different coolant temperatures, the temperatures were set at 60°C, 70°C, 80°C and 90°C in the tests. The testing results showed that coolant temperature influenced on performance of the LNG engine, the higher coolant temperature was, the better fuel economy would be, but NOx emission would be more. The coolant temperature also influenced on HC and CO emissions, but the influence was not obvious. By doing the tests, the optimum coolant temperature MAP of the engine was obtained.
 Number of references:9
 Main heading:Gas engines
Controlled terms:Coolants  -  Engines  -  Experiments  -  Fuel economy  -  Gas fuel purification  -  Liquefied natural gas  -  Optimal systems  -  Optimization
Uncontrolled terms:CO emissions  -  Coolant temperature  -  Optimal design  -  Testing results  -  Work performance
 Classification code:921.5 Optimization Techniques  -  901.3 Engineering Research  -  803 Chemical Agents and Basic Industrial Chemicals  -  621 Nuclear Reactors  -  612.3 Gas Turbines and Engines  -  612 Engines  -  523 Liquid Fuels  -  522 Gas Fuels  -  521 Fuel Combustion and Flame Research
 Database:Compendex
   
27. Accession number:20111913966195
Title:Inlet exhaust gas temperature condition for a burner-type DPF at the low and moderate load steady state
Authors:Fu, Jun1, 2 ; Gong, Jinke1 ; Wu, Gang1 ; Yu, Mingguo1 ; Yu, Xuan1 ; Zhang, Wenqiang1
Author affiliation: 1  State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
2  Department of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422004, China
 Corresponding author:Gong, J. (gongjinke@126.com)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 1-5 10
 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 operation principle of a burner-type diesel particulate filter was presented. Taking the subordinate oxidation reaction model into consideration, and taking the honeycomb wall-flow ceramic monolith filter as a research object, the simplified regeneration model in the single inlet channel of the filter was built at the steady state of the diesel engine. Based on the non-dimensionalization and the exhaust back-pressure model of DPF, the required temperature condition of the inlet exhaust for the burner-type DPF was obtained. The tests showed that the DPF regeneration could be smoothly completed by the burner power adjustment according to the oil spray rate correspond to the theoretical inlet exhaust temperature. It provided a definite theory basis to the design of the burner-type DPF.
 Number of references:10
 Main heading:Diesel engines
 Controlled terms:Air filters  -  Fuel filters  -  Inlet flow
Uncontrolled terms:Back pressures  -  Ceramic monolith  -  Diesel particulate filters  -  Dimensionalization  -  Exhaust gas temperatures  -  Exhaust temperature  -  Inlet channels  -  Inlet exhaust temperature  -  Operation principles  -  Oxidation reactions   -  Regeneration  -  Regeneration model  -  Research object  -  Spray rates  -  Steady state  -  Temperature conditions
Classification code:522 Gas Fuels  -  523 Liquid Fuels  -  612.2 Diesel Engines  -  631.1 Fluid Flow, General  -  802.1 Chemical Plants and Equipment
 Database:Compendex
   
28.Accession number:20111913966221
Title:Simultaneous detection of external and internal quality parameters of apples using hyperspectral technology
Authors:Shan, Jiajia1 ; Peng, Yankun1 ; Wang, Wei1 ; Li, Yongyu1 ; Wu, Jianhu1 ; Zhang, Leilei1
Author affiliation: 1  College of Engineering, China Agricultural University, Beijing 100083, China
 Corresponding author:Peng, Y. (ypeng@cau.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 140-144
 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 hyperspectral imaging technology was used to detect the bruises and solid soluble content (SSC) of apples simultaneously. The image at 794 nm from the first principle component was subtracted, the series of de-noising and threshold processing were performed and the bruises on apples were predicted with the accuracy of 92.6%. In the hyperspectral imaging, region of interest (ROI) was determined and spectrum reference curve was calculated. The original reflectance spectrum curve was processed by multiplicative scatter correction (MSC), a first derivative and SavitzkyGolay (SG) smoothing, and PLSR model was developed to predict SSC with Rc of 0.93, SEC of 0.47° Brix, and Rv of 0.92, SEV of 0.67° Brix. The research showed that it was feasible to detect the SSC and bruises on apples simultaneously with hyperspectral imaging technology.
 Number of references:16
 Main heading:Fruits
 Controlled terms:Curve fitting  -  Imaging techniques
Uncontrolled terms:Apples  -  Bruises  -  De-noising  -  First derivative  -  First-principles  -  HyperSpectral  -  Hyperspectral Imaging  -  Internal quality  -  Multiplicative scatter correction  -  Nondestructive detection   -  Reference curves  -  Reflectance spectrum  -  Region of interest  -  Savitzky-Golay  -  Simultaneous detection  -  Threshold processing
Classification code: 741 Light, Optics and Optical Devices  -  746 Imaging Techniques  -  821.4 Agricultural Products  -  921.6 Numerical Methods
 Database:Compendex
   
29. Accession number:20111913966217
Title:Pressure drop characteristics of the ventilation system in fresh-keeping transportation with controlled atmosphere
Authors:Lü, Enli1 ; Lu, Huazhong1 ; Yang, Zhou1 ; Han, Xiaoteng1 ; Zhang, Dongxia1 ; Han, Xu1
Author affiliation: 1  College of Engineering, South China Agricultural University, Guangzhou 510642, China
 Corresponding author:Lu, H. (huazlu@scau.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 120-124
 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 device of ventilation system was established to meet the requirement of fresh-keeping transportation with controlled atmosphere by liquid nitrogen. The pressure drop characteristics of the ventilation system were studied. The effects of airflow velocity, ratio of open area, stack mode and length of return air channel on the characteristics of pressure drop and energy consumption were analyzed. The pressure drop characteristics could be described by the equation of Ramsin. The pressure drop increased with the addition of airflow velocity. At the same airflow velocity, the pressure drop decreased with the addition of ratio of open area. The distribution of pressure drop in fresh-keeping room was steady. The effect of three stack modes on the pressure drop was not striking. The pressure drop was less when there was no return air channel. When the ratio of open area of the separator with holes in fresh-keeping transportation vehicle was bigger than 3.89%, it could meet low pressure loss and had small energy consumption. The research achievements will be instructive to the design of the ventilation system in fresh-keeping transportation with controlled atmosphere.
 Number of references:17
 Main heading:Pressure effects
Controlled terms:Energy utilization  -  Liquid nitrogen  -  Pressure drop  -  Transportation  -  Ventilation
Uncontrolled terms:Air channels  -  Air flow velocity  -  Controlled atmosphere  -  Energy consumption  -  Fresh-keeping transportation  -  Low pressures  -  Pressure drop characteristic  -  Pressure drop characteristics  -  Ratio of open area  -  Small energy   -  Transportation vehicles  -  Ventilation systems
Classification code:804.2 Inorganic Compounds  -  643.5 Ventilation  -  525.3 Energy Utilization  -  931.1 Mechanics  -  434 Waterway Transportation  -  432 Highway Transportation  -  431 Air Transportation  -  433 Railroad Transportation
 Database:Compendex
   
30. Accession number:20111913966219
 Title:Effects and mechanism of chitosan coatings in the control of superficial scald in apples
 Authors:Lü, Xin'gang1 ; Liu, Xinghua1 ; Cai, Luyang1
Author affiliation: 1  College of Food Science and Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
 Corresponding author:Liu, X. (liuxh2830@163.com)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 131-135
 Language:Chinese
 ISSN:10001298
 CODEN:NUYCA3
 Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:The effects of chitosan coatings on the control of superficial scald in "Fuji" apples were investigated, and the dynamic changes in α-farnesene production and oxidation, the texture and function of cell membrane and the activity of enzyme related with browning were also measured to reveal the mechanism of chitosan coatings in the superficial scald control. The results indicated that by chitosan coatings, the respiration rate and the ethylene production were inhibited, the production of α-farnesene and the accumulation of conjugated trienes were reduced, membrane lipid peroxidation was weakened and the integrity of cell membrane was kept, and the increase of polyphenoloxidase (PPO) activities was inhibited, the chitosan coating could effectively control the superficial scald in apples.
 Number of references:13
 Main heading:Chitosan
Controlled terms:Cell membranes  -  Chitin  -  Coatings  -  Cytology  -  Enzyme activity  -  Ethylene  -  Experiments  -  Fruits  -  Oxidation
Uncontrolled terms:Apples  -  Chitosan coatings  -  Dynamic changes  -  Ethylene production  -  Farnesene  -  Membrane lipid peroxidation  -  Polyphenol oxidase  -  Respiration rate  -  Superficial scald
Classification code: 901.3 Engineering Research  -  821.4 Agricultural Products  -  804.1 Organic Compounds  -  802.2 Chemical Reactions  -  539 Metals Corrosion and Protection; Metal Plating  -  461.9 Biology  -  461.2 Biological Materials and Tissue Engineering
 Database:Compendex
   
31. Accession number:20111913966216
 Title:Gas flow rate on pulse frequency in Helmholtz pulse combustor
 Authors:Wang, Liting1 ; Cui, Feng1 ; Liu, Xiangdong1
Author affiliation: 1  College of Engineering, China Agricultural University, Beijing 100083, China
 Corresponding author:Liu, X. (xdliu@cau.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 115-119 124
 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 further understand the frequency of Helmholtz pulse combustor, a Helmholtz type combustor was used to carry out the experiments in conditions of different gas flow rates. Through the experiments of three lengths tail pipe, frequency was all increased while the gas flow rate increased. The impact of gas flow rate on frequency was investigated, and the modification of theoretic formula was also proposed based on the difference between the theoretical and actual values. Compared with the experimental values, the results showed that the predicted values and the experimental values matched well.
 Number of references:11
 Main heading:Combustors
Controlled terms:Combustion  -  Experiments  -  Flow of gases  -  Gases  -  Helmholtz equation
Uncontrolled terms:Gas analysis  -  Gas flowrate  -  Modified formula  -  Pulse combustion  -  Pulse frequency
Classification code:521.1 Fuel Combustion  -  521.2 Combustors  -  631.1.2 Gas Dynamics  -  901.3 Engineering Research  -  921 Mathematics  -  931.2 Physical Properties of Gases, Liquids and Solids
 Database:Compendex
   
32. Accession number:20111913966230
 Title:Design on system of acquisition and wireless transmission for farmland image
 Authors:Xiong, Yingjun1 ; Shen, Mingxia1 ; Sun, Yuwen1 ; Xu, You2 ; Lin, Xiangze3
Author affiliation: 1  College of Engineering, Nanjing Agricultural University, Nanjing 210031, China
2  College of Electric Engineering, Southeast University, Nanjing 210096, China
3  College of Automation, Nanjing University of Science and Technology, Nanjing 210094, China
 Corresponding author:Shen, M. (mingxia@njau.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 184-187
 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:Based on ZigBee and GPRS, a system was designed to acquire farmland images and transfer the images wirelessly. The system consisted of MESH-type ZigBee network for image acquisition and a remote server which could communicate with the ZigBee network coordinator via GPRS network. The image acquisition based on the V4L technology was introduced first, and the process of JPEG compression and decompression was described, the method of reducing the computational complexity of image compression by the improved discrete cosine transform (DCT) was studied, then how to improve reliability in the data transmission by partitioning and checking image data was discussed. At last, the system was tested in the given field and it proved that the successful rate of farmland image acquisition was 76%. Furthermore, the difference between the theoretical and practical transmission time was analyzed.
 Number of references:9
 Main heading:Farms
Controlled terms:Computational complexity  -  Cosine transforms  -  Design  -  Discrete cosine transforms  -  Image acquisition  -  Image compression  -  Metadata
Uncontrolled terms:Data transmission  -  Farmland information  -  GPRS network  -  Image data  -  Image wireless transmission  -  Joint photographic expert group  -  JPEG compression  -  Remote servers  -  Transmission time  -  Wireless transmissions   -  Zig-Bee  -  ZigBee networks
Classification code:408 Structural Design  -  721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory  -  723 Computer Software, Data Handling and Applications  -  741 Light, Optics and Optical Devices  -  821 Agricultural Equipment and Methods; Vegetation and Pest Control  -  921.3 Mathematical Transformations
 Database:Compendex
   
33. Accession number:20111913966205
Title:Relationship between soil water repellency and soil physical-chemical properties for vertical profiles in secondary saline field
 Authors:Ren, Xin1 ; Li, Yi1 ; Li, Min1 ; Guo, Lijun1 ; Feng, Man2
Author affiliation: 1  Key Lab. of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Edu., Northwest A and F University, Yangling, Shaanxi 712100, China
2  College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
 Corresponding author:Li, Y. (liyikitty@126.com)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 58-64 79
 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 seek the variations of soil water repellency and its relationship with soil moisture content, soil salt content and pH value, soils samples were collected in two profiles at two grids (intervals were 10 cm×10 cm and 5 cm×5 cm, respectively) in a newly cultivated cotton field mulched with plastic film and irrigated with trickle method in Xinjiang. The soil water repellency, soil moisture content, soil salt content and pH value of the profiles were tested and analyzed using the methods of classical statistics, geostatistics and correlation analysis. The results showed that the soil water repellency had moderate variability and the spatial auto-correlation was under the level of the middle class in secondary saline field profiles. The strongest soil water repellency appeared around the depth of 40 cm and the characteristics of soil water repellency were not obvious when the depth was deeper than 80 cm. The soil moisture content and the soil water repellency appeared to be positively related at 0~40 cm depth and negatively related at 40~80 cm depth. Soil salt content and soil water repellency appeared to be positively related to the surface soil layer at 0~10 cm depth but negatively related to the other depth. The pH value and the soil water repellency mostly were generally positively related.
 Number of references:26
 Main heading:Soil surveys
Controlled terms:Chemical analysis  -  Moisture determination  -  pH  -  Protective coatings  -  Saline water  -  Soil moisture  -  Water content
Uncontrolled terms:Correlation analysis  -  Field profile  -  Geo-statistics  -  Middle class  -  pH value  -  Secondary saline  -  Secondary saline field  -  Soil moisture content  -  Soil salt content  -  Soil water repellency   -  Surface soil layers  -  Vertical profile  -  Xinjiang
Classification code:944.2 Moisture Measurements  -  813.2 Coating Materials  -  804 Chemical Products Generally  -  801.1 Chemistry, General  -  801 Chemistry  -  483.1 Soils and Soil Mechanics  -  444 Water Resources
 Database:Compendex
   
34. Accession number:20111913966214
 Title:Microstructure of corn stover briquette
 Authors:Tian, Xiaoyu1 ; Hou, Zhendong1 ; Xu, Yang1
Author affiliation: 1  College of Engineering, China Agricultural University, Beijing 100083, China
 Corresponding author:Xu, Y. (xuyang@cau.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 105-108
 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:Factors that affect the corn densification contained pressure, heating temperature, moisture content and etc., and microstructure of briquette also has a major impact on the macroscopic properties. The microstructure and binding mode of material particles inside briquette were observed with electron stereoscopic microscope, the relationship between molding process parameters and forming microstructure were studied from the microscopic view. The results showed that particles in corn straw briquette were mainly combined in two forms-mechanical mosaic and natural adhesive bonding. Under the condition of pressure 60~90 MPa, material temperature 75~100°C, moisture content 8%~16%, internal particles of briquette were combined closely, with obvious mechanical enchase effect, corresponding to get physical quality and mechanics with good performance.
 Number of references:9
 Main heading:Microstructure
Controlled terms:Binding energy  -  Briquets  -  Briquetting  -  Densification  -  Moisture  -  Moisture determination  -  Molding  -  Pressure effects
Uncontrolled terms:Binding modes  -  Corn stover  -  Corn straws  -  Densification mechanism  -  Forming microstructure  -  Heating temperatures  -  Macroscopic properties  -  Material particles  -  Material temperature  -  Microscopic views   -  Moisture contents  -  Molding process  -  Natural adhesives  -  Physical quality
Classification code:524 Solid Fuels  -  535.2 Metal Forming  -  801.4 Physical Chemistry  -  802.3 Chemical Operations  -  931.1 Mechanics  -  944.2 Moisture Measurements
 Database:Compendex
   
35. Accession number:20111913966202
 Title:Sediment yields from the parallel watersheds in the hilly-gully regions of Loess Plateau
Authors:Yuan, Cuiping1 ; Lei, Tingwu1 ; Zhang, Manliang2 ; Fan, Yuntao3 ; Hu, Xiaojun2 ; Xu, Feng2
Author affiliation: 1  College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, China
2  Tianshui Soil and Water Conservation Management and Monitoring Bureau of Yellow River, Yellow River Conservation Commission, Ministry of Water Resource, Tianshui 741000, China
3  State Key Laboratory of Soil Plant Machinery System Technology, Chinese Academy of Agricultural Mechanization Sciences, Beijing 100083, China
 Corresponding author:Lei, T. (ddragon@public3.bta.net.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 36-43
 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 Qiaozi-East watershed with management and Qiaozi-West watershed without management at the third sub-region of Loess Plateau were selected as studying areas. The rainfall, runoff and sediment data were used to study the effects of soil and water conservation management on sediment yields, runoff-sedimentation relations, and sediment delivery processes. The annual sediment yields of Qiaozi-East watershed were considerably lower than those of Qiaozi-West watershed. The mean sediment contents in runoff and mean sediment delivery rates from Qiaozi-East watershed were 40% and 80% less than those from Qiaozi-West watershed respectively. Soil and water conservation management altered the sediment contents and sediment delivery processes. At the early stage of the practice, the sediment contents from Qiaozi-East watershed were higher than those of Qiaozi-West watershed, but the sediment delivery rates were more or less than those of Qiaozi-West watershed. With years of management, the sediment contents and sediment delivery rates from Qiaozi-East watershed were lower than those from Qiaozi-West watershed. Soil and water conservation management altered the runoff and sediment relations.
 Number of references:17
 Main heading:Sedimentology
Controlled terms:Anoxic sediments  -  Erosion  -  Landforms  -  Management  -  Runoff  -  Sediment transport  -  Soil conservation  -  Soils  -  Water conservation  -  Watersheds
Uncontrolled terms:Loess Plateau  -  Parallel watershed  -  Sediment content  -  Sediment delivery  -  Sediment yields  -  Soil and water conservation  -  Soil and water conservation management  -  Sub-regions
Classification code:444 Water Resources  -  444.1 Surface Water  -  481.1 Geology  -  483 Soil Mechanics and Foundations  -  483.1 Soils and Soil Mechanics  -  912.2 Management
 Database:Compendex
   
36. Accession number:20111913966200
 Title:Electrostatic atomization of biodiesel based on high-speed camera technology
Authors:Wang, Junfeng1 ; Huang, Jiwei1 ; Wang, Zhentao1 ; Wang, Xiaoying1 ; Huang, Qiaomei1
Author affiliation: 1  School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
 Corresponding author:Wang, J. (wangjunfeng@ujs.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 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:Electrostatic atomization phenomenon for single droplet was shot based on high-speed video camera with tens of thousands of frames per second. The deformation of the charged and non-charged droplets, as well as their movements were compared and analyzed. The atomization mode at different voltages and the Taylor-cone length and cone angle changes under cone-jet mode were obtained. The results showed that droplet size decreased when the voltage increased, whereas its velocity increased with the voltage increasing. Biodiesel has bigger deformation rate than water under the same capillary, and the small droplet of biodiesel has larger deformation degree than big one. As the voltage increased, droplet went through dripping mode, the transition phase, cone-jet mode and multi-jet mode. In cone-jet mode, the cone length of Taylor-cone became direct ratio to the voltage, whereas the cone angle inversed to it. Conductivity had impact on the droplet movement, droplets with smaller conductivity moved along with the capillary axis, while droplets with bigger conductivity had both axial movement and radial movement.
 Number of references:18
 Main heading:Drop breakup
Controlled terms:Atomization  -  Biodiesel  -  Cameras  -  Deformation  -  Electrostatics  -  High speed cameras  -  Jets  -  Video cameras
Uncontrolled terms:Atomization mode  -  Axial movement  -  Capillary axis  -  Charged droplet  -  Cone angle  -  Cone-jet mode  -  Deformation degrees  -  Deformation rates  -  Dripping modes  -  Droplet   -  Droplet movement  -  Droplet sizes  -  Electrostatic atomization  -  Frames per seconds  -  High speed video cameras  -  High-speed video camera  -  Radial movement  -  Single droplet  -  Small droplets  -  Transition phase
Classification code:802.3 Chemical Operations  -  742.2 Photographic Equipment  -  701.1 Electricity: Basic Concepts and Phenomena  -  931.2 Physical Properties of Gases, Liquids and Solids  -  631.1 Fluid Flow, General  -  422 Strength of Building Materials; Test Equipment and Methods  -  421 Strength of Building Materials; Mechanical Properties  -  523 Liquid Fuels
 Database:Compendex
   
37. Accession number:20111913966208
Title:Numerical simulation of inner flow in centrifugal pump with long-mid-short blade complex impeller
 Authors:Cui, Baoling1 ; Zhu, Zuchao1, 2 ; Lin, Yonggang2
Author affiliation: 1  Laboratory of Fluid Transmission and Application, Zhejiang Sci.-Tech. University, Hangzhou 310018, China
2  State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China
 Corresponding author:Cui, B. (blcui@zstu.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 74-79
 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 the NavierStokes equations and the SpalartAllmaras turbulence model, 3-D turbulent flow field in centrifugal pump with long-mid-short blade complex impeller was calculated and analyzed numerically. The relative velocity and pressure distributions in the flowpart were obtained. It was found that the flow in the channel of the complex impeller was unsymmetrical due to the joint action between the volute and impeller. The flow in other channels was similar to that calculated using the single channel except for the ones near the volute throat. The back-flow region was at inlet of long-blade suction side, near middle part of long-blade pressure side and outlet of short-blade suction side. The flow near volute throat was affected greatly by volute. The relative velocity was biggish and it was easy to bring back flow at outlet of the complex impeller near volute throat. And the static and total pressure rose uniformly from inlet to outlet in the impeller. The flow from the impeller outlet to volute had a trend to form the swirl near the wall of the volute and moved forward in spiral direction.
 Number of references:8
 Main heading:Inlet flow
Controlled terms:Centrifugal pumps  -  Hydraulic machinery  -  Impellers  -  Pumping plants  -  Pumps  -  Three dimensional  -  Turbulence models  -  Turbulent flow
Uncontrolled terms:Back flow  -  Blade pressure  -  Blade suction  -  Complex impeller  -  Flow regions  -  Impeller outlet  -  Inner flow  -  Joint actions  -  Long-mid-short blade  -  Numerical simulation   -  Relative velocity  -  Single channels  -  Spalart-Allmaras turbulence model  -  Test  -  Total pressure
Classification code:446 Waterworks  -  601.2 Machine Components  -  618.2 Pumps  -  631.1 Fluid Flow, General  -  632.2 Hydraulic Equipment and Machinery  -  902.1 Engineering Graphics
 Database:Compendex
   
38. Accession number:20111913966234
 Title:Rigid-body guidance mechanism synthesis through four mixed positions
 Authors:Yang, Tong1 ; Han, Jianyou1
Author affiliation: 1  School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
 Corresponding author:Yang, T. (yangtong_ustb@foxmail.com)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 203-207 196
 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 rigid-body guidance mechanism synthesis through four finitely separated positions and four mixed positions, a displacement matrix method was presented for calculating the Burmester curves. After the equations of Burmester curves have been deduced, they were turned into the standard forms through coordinate transformations. Then according to the projective geometry theory that two pencils-of-low-order curves constituted a high-order curve, the Burmester curves could be single-valuably and orderly expressed by intersections of a pencil-of-circles and a pencil-of-lines. Finally, solution regions were set up so that the designers could have an intuitional and exact knowledge of mechanism properties.
 Number of references:10
 Main heading:Mechanical engineering
Uncontrolled terms:Burmester curve  -  Co-ordinate transformation  -  Displacement matrix method  -  Four mixed positions  -  High-order  -  Mechanism properties  -  Mechanism synthesis  -  Projective geometry  -  Rigid body  -  Standard form
 Classification code:608 Mechanical Engineering, General
 Database:Compendex
   
39. Accession number:20111913966196
Title:Estimating diesel engine combustion timing based on vibration acceleration of cylinder head
 Authors:Tang, Juan1 ; Cheng, Yong1 ; Liu, Yang1 ; Ma, Zongzheng1
Author affiliation: 1  College 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:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 6-10
 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: Estimating combustion timing in diesel engine by cylinder head vibration acceleration was presented. The correlation between the vibration acceleration and the second derivative pressure was compared based on a 195 diesel engine finite element model. Results showed that the vibration acceleration and the second derivative pressure had the similar trend before the peak pressure, and the combustion timing was supposed to be identified by the zero vibration acceleration at this range. Experiments were conducted on a 195 diesel engine and the results verified that the combustion timing could be determined by the vibration acceleration of cylinder head with the deviation within ±1.5° CA.
 Number of references:9
 Main heading:Engine cylinders
Controlled terms:Acceleration  -  Combustion  -  Cylinders (shapes)  -  Diesel engines  -  Engines  -  Finite element method
Uncontrolled terms:Combustion timings  -  Cylinder head  -  Finite element models  -  Peak pressure  -  Second derivatives  -  Vibration acceleration  -  Zero vibration
Classification code:408.2 Structural Members and Shapes  -  521.1 Fuel Combustion  -  612 Engines  -  921.6 Numerical Methods  -  931.1 Mechanics
 Database:Compendex
   
40. Accession number:20111913966231
Title:Model of water use efficiency of leaves based on laser induced chlorophyll fluorescence analysis technique
 Authors:Sui, Yuanyuan1 ; Yu, Haiye1 ; Yang, Haoyu1 ; Zhang, Lei1 ; Zhou, Liang1
Author affiliation: 1  School of Biological and Agricultural Engineering, Jilin University, Changchun 130025, China
 Corresponding author:Yu, H. (haiye@jlu.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 188-191
 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 non-destructive detection, the fluorescence spectrum of living leaves of poplar was collected by laser as excitation light source. Sensitive fluorescence spectrum band of water use efficiency was arrived through analyzing spectrum data. A model depending on the modification of leaves temperature was established. The functional relation between water use efficiency and fluorescence spectrum was described and the multiple correlation coefficients R2 were 0.975. The correlation coefficient r between calculated values and measured values was 0.8746 by verification test.
 Number of references:8
 Main heading:Mathematical models
Controlled terms:Chlorophyll  -  Efficiency  -  Fluorescence  -  Laser excitation  -  Light sources  -  Water supply
Uncontrolled terms:Calculated values  -  Chlorophyll fluorescence  -  Correlation coefficient  -  Excitation light sources  -  Fluorescence spectra  -  Functional relation  -  Laser induced  -  Multiple correlation coefficients  -  Nondestructive detection  -  Verification tests   -  Water use efficiency
Classification code: 446.1 Water Supply Systems  -  741.1 Light/Optics  -  744.9 Laser Applications  -  804.1 Organic Compounds  -  913.1 Production Engineering  -  921 Mathematics
 Database:Compendex
   
41. Accession number:20111913966207
 Title:Numerical simulation and experiment on deep-well centrifugal pump
 Authors:Zhou, Ling1 ; Shi, Weidong1 ; Lu, Weigang1 ; Zhang, Li1 ; Wang, Chuan1
Author affiliation: 1  Technical and Research Center of Fluid Machinery Engineering, Jiangsu University, Zhenjiang 212013, China
 Corresponding author:Shi, W. (wdshi@ujs.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 69-73
 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 predict the performance of deep-well centrifugal pump quickly and accurately by the commercial CFD software Fluent, 150QJ20 type deep-well centrifugal pump was taken as an experimental object to research the key set methods on the Fluent simulation. The numerical simulation was carried out at different grid numbers, different residual convergence precisions, different turbulence models, and different flow calculation methods to analyze the impact on simulation results. And different stages of the deep-well centrifugal pump model simulations were analyzed and discussed. The best set methods of numerical simulation for deep-well centrifugal pump were selected. The differences between numerical simulation and experimental results were compared and analyzed. This work is real significance in understanding the accuracy for deep-well centrifugal pump, and it confirmed the feasibility of predict the performance of deep-well centrifugal pump by using Fluent.
 Number of references:11
 Main heading:Computer simulation
Controlled terms:Centrifugal pumps  -  Computational fluid dynamics  -  Computer software  -  Convergence of numerical methods  -  Experiments  -  Hydraulic machinery  -  Pumping plants  -  Pumps  -  Turbulence models
Uncontrolled terms:CFD softwares  -  Deep-well centrifugal pump  -  Flow calculations  -  Fluent simulation  -  Numerical simulation  -  Pump models  -  Simulation result
Classification code:901.3 Engineering Research  -  723.5 Computer Applications  -  723 Computer Software, Data Handling and Applications  -  921.6 Numerical Methods  -  632.2 Hydraulic Equipment and Machinery  -  446 Waterworks  -  443.1 Atmospheric Properties  -  618.2 Pumps
 Database:Compendex
   
42. Accession number:20111913966227
Title:Recognition and features extraction of cucumber downy mildew based on color and texture
 Authors:Geng, Changxing1 ; Zhang, Junxiong1 ; Cao, Zhengyong1 ; Li, Wei1
Author affiliation: 1  College of Engineering, China Agricultural University, Beijing 100083, China
 Corresponding author:Geng, C. (gcxk@cau.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 170-174
 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 extraction algorithm based on color and texture was developed to realize segmentation between downy mildew and cucumber plants in greenhouse. A light analysis model was established by comparing the distribution of cucumber images in RGB, HIS and YCbCr color space, which was beneficial to the recognition of disease in variable illuminations. Combination model of Cb and Cr elements was built based on the mean difference of lesions and interference informations in Cb and Cr, which included leaves, poles and soil, and extracted target rapidly. A detecting expriment was carried out on 30 images with downy mildew, which were taken in a changing greenhouse enviornment. The results indicated that the accuracy rate of segmentation was 90.6%.
 Number of references:10
 Main heading:Feature extraction
Controlled terms:Color  -  Fungi  -  Geologic models  -  Greenhouses  -  Image enhancement  -  Textures
Uncontrolled terms:Accuracy rate  -  Analysis models  -  Combination models  -  Cucumber downy mildew  -  Cucumber plants  -  Downy mildew  -  Extraction algorithms  -  Features extraction  -  Recognition  -  Variable illumination   -  Ycbcr color spaces
Classification code:402.1 Industrial and Agricultural Buildings  -  461.9 Biology  -  481.1 Geology  -  741 Light, Optics and Optical Devices  -  741.1 Light/Optics  -  933 Solid State Physics
 Database:Compendex
   
43. Accession number:20111913966198
Title:Combustion and emissions performance of a HCCI engine fueled with DME and hydrogen blends
Authors:Liang, Chen1 ; Ji, Changwei1 ; Kong, Lingkai1 ; Zhu, Yongming1 ; Dai, Xiaoxu1 ; Fan, Boyuan1
Author affiliation: 1  College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
Corresponding author:Ji, C. (chwji@bjut.edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 15-20
 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:DME and hydrogen were blended with air in intake and the HCCI combustion was realized. The speed of engine was hold at 1400 r/min and the mass flow rate of DME was ranged at 2.6 and 3.5 L/min. With the hydrogen fraction increasing, the excessive air coefficient λ was reduced until the engine knocked. The result showed that DME blended with hydrogen could increase the peak pressure, heat release rate and BMEP. The peak pressure was improved 26.4% when the DME flow was 3.5 L/min. In the emissions, CO and HC could be reduced, and CO emission was only 20%~30% of the original data after hydrogen enriched. However, NOx emissions increased with the addition of hydrogen.
 Number of references:24
 Main heading:Ignition
Controlled terms:Air intakes  -  Ethers  -  Fuels  -  Hydrogen  -  Internal combustion engines  -  Organic compounds
Uncontrolled terms:Air coefficient  -  CO emissions  -  Dimethyl ether  -  Emission  -  Emissions performance  -  HCCI combustion  -  HCCI engine  -  Heat release rates  -  Homogeneous charge compression ignition  -  Mass flow rate   -  Peak pressure
Classification code:804 Chemical Products Generally  -  631.1 Fluid Flow, General  -  612.1 Internal Combustion Engines, General  -  804.1 Organic Compounds  -  524 Solid Fuels  -  522 Gas Fuels  -  521.1 Fuel Combustion  -  523 Liquid Fuels
 Database:Compendex
   
44. Accession number:20111913966224
 Title:Effect of milling pH value on mozzarella cheese meltability
Authors:Guo, Yuan1 ; Guo, Huiyuan1 ; Wang, Fang1 ; Wan, Changjiang2 ; Jiang, Lu1 ; Ren, Fazheng1
Author affiliation: 1  College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
2  Dali Polytechnic College of Agriculture and Forestry, Dali 671003, China
  Corresponding author:Ren, F. (renfazheng@263.net)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 156-160
 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 effect of different milling pH value on cheese meltability was studied. Combined with confocal laser scanning spectroscopy, DSC and rheometer techniques, meltability, freezable water content, pH 4.6-soluble protein and Urea-PAGE were analyzed during 1~7 weeks storages. Results showed that Mozzarella cheese with a low milling pH value had less freezable water and more binding water. When the storage prolonged (more than 21d), protein degradation increased, and better meltability was achieved.
 Number of references:18
 Main heading:pH effects
 Controlled terms:Milling (machining)  -  Urea  -  Water content
Uncontrolled terms:Confocal laser scanning  -  Freezable water  -  Meltability  -  Milling pH value  -  Mozzarella cheese  -  pH value  -  Protein degradation  -  Soluble proteins
Classification code:444 Water Resources  -  604.2 Machining Operations  -  801.1 Chemistry, General  -  804.1 Organic Compounds
 Database:Compendex
   
45. Accession number:20111913966229
Title:Improved chan-vese model and its application on high resolution remote sensing image segmentation
 Authors:Xu, Wenning1 ; Mei, Shuli1 ; Wang, Pengxin1 ; Yang, Yong2
Author affiliation: 1  College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China
2  Chinese Academy of Agricultural Mechanization Sciences, Beijing 100083, China
 Corresponding author:Mei, S. (meishuli@163.com)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
 Abbreviated source title: Nongye Jixie Xuebao
 Volume:42
 Issue:3
 Issue date: March 2011
 Publication year:2011
 Pages: 180-183
 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 improved CV model was presented according to the characters and the segmentation requirements of the remote sensing images. The correctness of the improved model was validated by the experiment. The results show that the new method can improve calculation efficiency effectively. Beside this, a continuous and closed boundary curve of the target objects can be obtained at the same time. Therefore, the land cover can be identified precisely with the help of the geometrical characteristic of the segmentation boundary.
 Number of references:11
 Main heading:Image segmentation
 Controlled terms:Image reconstruction  -  Remote sensing
Uncontrolled terms:Calculation efficiency  -  Chan-Vese model  -  Closed boundary  -  CV model  -  Geometrical characteristics  -  High resolution remote sensing images  -  Improved models  -  Land cover  -  Remote sensing images  -  Segmentation boundaries   -  Target object
Classification code:731.1 Control Systems  -  741 Light, Optics and Optical Devices  -  741.1 Light/Optics
 Database:Compendex