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2010年第41卷第7期共收录45篇
1. Accession number: 20103213129044
Title: Combined dynamic countercurrent extraction technology with microwave ultrasonic-wave extraction for tea
Authors: Zhu, Dewen1, 2 ; Yue, Pengxiang1 ; Wang, Jixian1 ; Yuan, Dishun3 ; Chen, Yongsheng2
Author affiliation: 1 College of Engineering, Anhui Agricultural University, Hefei 230036, China
2 Nanjing Research Institute for Agricultural Mechanization, Ministry of Agriculture, Nanjing 210014, China
3 College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Corresponding author: Yue, P. (yueyue606@hotmail.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 136-140
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 combined dynamic countercurrent extraction equipment by microwave and ultrasonic-wave was investigated. The structural composition, working principle and technical characteristics of the equipment were introduced. The experiment of extracting more effective components of tea with the combination dynamic countercurrent extraction process by using microwave and ultrasonic-wave was tried with setting water as solvent and fresh tea leaves as raw materials. The rate of extracting effective composition in tea by using different extraction powers, extraction ratios of solid-liquid and extraction time were investigated. And the extraction process was optimized by L9 (34) orthogonal experimental design. The experimental results showed that the optimal extraction process parameters of the device were extraction time microwave 6 min ultrasonic-wave 6min, solid-liquid ratio 1:20, extraction power microwave 1.0 kW ultrasonic-wave 1.0 kW. The extracting rate of tea polyphenol, amino acids and caffeine was higher than the normal extraction, and the extraction time, the extracting times and the extraction temperature were 1/5, 1/2 and 1/2 of the normal extraction, respectively.
Number of references: 12
Main heading: Solvent extraction
Controlled terms: Amino acids - Liquids - Microwaves - Optimization - Organic acids - Process control - Ultrasonic waves - Ultrasonics
Uncontrolled terms: Countercurrent extraction - Countercurrent extraction process - Extraction process - Extraction ratio - Extraction temperatures - Extraction time - Microwave process - Orthogonal experimental design - Polyphenols - Power microwave - Solid-liquid - Solid-liquid ratio - Structural composition - Tea leaves - Technical characteristics - Water as solvent - Working principles
Classification code: 921.5 Optimization Techniques - 804.1 Organic Compounds - 802.3 Chemical Operations - 931.2 Physical Properties of Gases, Liquids and Solids - 753.1 Ultrasonic Waves - 711 Electromagnetic Waves - 461 Bioengineering and Biology - 731 Automatic Control Principles and Applications
DOI: 10.3969/j.issn.1000-1298.2010.07.029
Database: Compendex
2. Accession number: 20103213129033
Title: Influencing factors and amelioration of soil water repellency
Authors: Chen, Junying1 ; Zhang, Zhitao1 ; Wang, Zhinong1 ; Oron, Gideon2 ; Gillerman, Leionid2
Author affiliation: 1 College of Water Resources and Architectural Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
2 J. Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boker 84990, Israel
Corresponding author: Wang, Z. (wwzn@263.net)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 84-89 83
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract: The influencing factors such as fire, soil moisture, organic matter, soil pH value, biology film, clay mineral etc. and the amelioration of soil water repellency and the research progress were mainly discussed. Meanwhile it has been pointed that the further study should be focused on the research of soil pore or particle-scale, expressing the relationship between water repellency and soil moisture, quantifying the various hydrological effects of water repellence at large field scales. The future research orientation on water repellency in China was also pointed out.
Number of references: 44
Main heading: Soil moisture
Controlled terms: Clay minerals - Moisture determination - Research - Silicate minerals - Underwater soils
Uncontrolled terms: Field scale - Hydrological effects - Improvement measure - Influencing factor - Organic matter - Research progress - Soil pH - Soil pores - Soil water repellency - Water repellence - Water repellency
Classification code: 471.1 Oceanography, General - 482.2 Minerals - 483.1 Soils and Soil Mechanics - 901.3 Engineering Research - 944.2 Moisture Measurements
DOI: 10.3969/j.issn.1000-1298.2010.07.018
Database: Compendex 3. Accession number: 20103213129021
Title: Optimization of power matching on torque-converter with diesel engine for wheel loader
Authors: Chang, Lü1
Author affiliation: 1 Faculty of Transportation Engineering, Huaiyin Institute of Technology, Huaian 223003, China
Corresponding author: Chang, L. (changlv7114@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 25-29
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 no-rationality of the optimization of power matching on torque-converter with diesel engine for wheel loader was analyzed. Based on the hydraulic pump in accordance with the work of loaders, the loader was divided into three typical operating conditions. The satisfactory degree function in the optimization of power matching on torque-converter with diesel engine based on the generalized satisfactory degree theory was explored. Multi-objective optimization design of power matching on torque-converter with diesel engine was introduced, and the problem-solving steps and methods were given. The analysis shows that this method can improve the quality of the power matching.
Number of references: 16
Main heading: Torque converters
Controlled terms: Construction equipment - Diesel engines - Fluid dynamics - Hydrodynamics - Loaders - Mining machinery - Multiobjective optimization - Torque - Wheels
Uncontrolled terms: Desirability function - Hydraulic pump - Hydrodynamic transmission - Operating condition - Power matching - Satisfactory degree - Wheel loaders
Classification code: 931.2 Physical Properties of Gases, Liquids and Solids - 631.1.1 Liquid Dynamics - 631.2 Hydrodynamics - 662.4 Automobile and Smaller Vehicle Components - 691.1 Materials Handling Equipment - 921.5 Optimization Techniques - 931.1 Mechanics - 631.1 Fluid Flow, General - 602.1 Mechanical Drives - 601.2 Machine Components - 502.2 Mine and Quarry Equipment - 421 Strength of Building Materials; Mechanical Properties - 405.1 Construction Equipment - 612.2 Diesel Engines
DOI: 10.3969/j.issn.1000-1298.2010.07.006
Database: Compendex 4. Accession number: 20103213129036
Title: Experiment analysis on pretreatment of corn cob saccharification by acid and alkali coordination with microwave
Authors: Yang, Peizhou1, 2 ; Jiang, Shaotong1, 2 ; Pan, Lijun1, 2 ; Luo, Shuizhong1, 2 ; Xu, Yan1 ; Yi, Shoulian1
Author affiliation: 1 School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei 230009, China
2 Food Science and Engineering Post-Doctoral Research Center, Hefei University of Technology, Hefei 230009, China
Corresponding author: Jiang, S. (jiangshaotong@yahoo.com.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 101-104
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: Pretreatment of corn cob was carried out by microwave/alkali and microwave/acid, including different power densities and time of microwave pretreatment. The results showed that average weight of reducing sugar received by microwave/alkali pretreatment was 51.71 mg, over 33.82% than the control. And the weight was 8.76 mg by microwave/acid. Acid/alkali pretreatments were followed by microwave treatment. Average FPA activities were 2.23 U/mL and 10.90 U/mL in fermentation fluid, respectively, increasing 35.05% and 17.26% compared with the control. Meantime average CMC activities were 3.43 U/mL and 12.41 U/mL, respectively, decreasing 15.96% and increasing 34.32% respectively compared with the control. Alkali pretreatment of corn cob followed by microwave was better than the acid pretreatment.
Number of references: 16
Main heading: Microwaves
Controlled terms: Acids - Experiments - Saccharification - Sugar (sucrose)
Uncontrolled terms: Acid pretreatment - Alkali pretreatment - Cellulase - Corn cob - Experiment analysis - Microwave pretreatment - Microwave treatment - Power densities - Pre-Treatment - Pre-treatments - Reducing sugars
Classification code: 822.3 Food Products - 811.3 Cellulose, Lignin and Derivatives - 804 Chemical Products Generally - 901.3 Engineering Research - 803 Chemical Agents and Basic Industrial Chemicals - 801.2 Biochemistry - 711 Electromagnetic Waves - 802.2 Chemical Reactions
DOI: 10.3969/j.issn.1000-1298.2010.07.021
Database: Compendex 5. Accession number: 20103213129029
Title: Effect on both soil infiltration characteristics and ion mobility features by mineralization degree of infiltration water
Authors: Wu, Zhongdong1 ; Wang, Quanjiu2
Author affiliation: 1 Institute of Resources and Environment Engineering, Shandong University of Technology, Zibo 255049, China
2 Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an 710048, China
Corresponding author: Wang, Q. (wquanjiu@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 64-69 75
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: One-dimensional perpendicular infiltration process to water with different mineralization degree by uniformity earth pillar experiments was studied. Soil moisture content distribution and infiltration rate infiltrated by different mineralization degree were analyzed. The variance in regular pattern of soil profile salt content as well as desalt depth after infiltration in response to mineralization degree of infiltrated water were carried out at the same time. The results showed that saline water infiltration could transform soil structure and enhance both soil water transmitting ability and moisture holding capacity, but in company with sodium ion in soil increasing, soil water transmitting ability and moisture holding capacity did not depend only on mineralization degree, but rather codetermined by both mineralization degree and sodium ion quantity; top soil salt would be infiltrated by water when mineralization degree lowered about 3 g/L, but soil salt was scarcely infiltrated when mineralization degree further increased.
Number of references: 16
Main heading: Saline water
Controlled terms: Desalination - Groundwater - Metal ions - Mineralogy - Moisture determination - Ponding - Seepage - Soil mechanics - Soil moisture - Underwater soils - Water content - Water filtration - Wavelet transforms
Uncontrolled terms: Infiltrated water - Infiltration process - Infiltration rate - Ion Mobility - Mineralization degree - Moisture content - Moisture contents - Moisture holding capacity - Regular patterns - Salt content - Sodium ions - Soil infiltration - Soil moisture content - Soil profiles - Soil structure - Soil water - Top soils
Classification code: 482 Mineralogy - 483.1 Soils and Soil Mechanics - 531.1 Metallurgy - 533 Ore Treatment and Metal Refining - 802.3 Chemical Operations - 921.3 Mathematical Transformations - 944.2 Moisture Measurements - 471.4 Seawater, Tides and Waves - 402 Buildings and Towers - 407 Maritime and Port Structures; Rivers and Other Waterways - 441 Dams and Reservoirs; Hydro Development - 444 Water Resources - 444.2 Groundwater - 445.1 Water Treatment Techniques - 471.1 Oceanography, General
DOI: 10.3969/j.issn.1000-1298.2010.07.014
Database: Compendex 6. Accession number: 20103213129043
Title: Preparation process optimization of Pd/C catalysts for hydrogenation soy lecithin
Authors: Song, Lan1 ; Zhang, Min1
Author affiliation: 1 Food College, Northeast Agricultural University, Harbin 150030, China
Corresponding author: Zhang, M. (xzm7777@sina.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 132-135 162
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract: Pd/C catalysts was prepared by impregnation and the variation of soy lecithin's iodine value after hydrogenation was studied. The characterization of catalysts was analyzed by using microspecrtoscopy (TEM). The results showed the optimum preparation condition was as follows: when carbon was pretreated with 10% HNO3 solution, impregnated 2 h in 3.5 mg/mL H2PdCl4 solution at 40°C, then reduced 5h in 30% formaldehyde solution at 80°C, solution pH value 1-2, Pd/C catalysts were dried in 80°C vacuum condition. The Pd particles size was 7.8 nm. After Pd/C catalysts hydrogenated, soy lecithin's iodine was down to 18.6 gI/(100 g). The results showed solution pH value effected catalysts activity largely. The smaller Pd particles size was, the stronger catalyst activity was.
Number of references: 9
Main heading: Catalyst activity
Controlled terms: Hydrogenation - Industrial chemicals - Iodine - Optimization - Palladium - pH effects - Phospholipids
Uncontrolled terms: Characterization of catalysts - Formaldehyde solutions - Iodine value - Pd particle - Pd/C catalyst - Preparation - Preparation conditions - Preparation process - Solution pH - Soy lecithin - TEM - Vacuum condition
Classification code: 921.5 Optimization Techniques - 804.1 Organic Compounds - 804 Chemical Products Generally - 803 Chemical Agents and Basic Industrial Chemicals - 802.2 Chemical Reactions - 801.1 Chemistry, General - 547.1 Precious Metals
DOI: 10.3969/j.issn.1000-1298.2010.07.028
Database: Compendex
7. Accession number: 20103213129049
Title: Early stage crop rows detection based on least square method
Authors: Si, Yongsheng1, 2 ; Jiang, Guoquan3 ; Liu, Gang2 ; Gao, Rui2 ; Liu, Zhaoxiang2
Author affiliation: 1 College of Information Science and Technology, Agricultural University of Hebei, Baoding 071001, China
2 Key Laboratory on Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing 100083, China
3 School of Computer Science and Technology, Henan Polytechnic University, Jiaozuo 454003, China
Corresponding author: Liu, G. (pac@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 163-167 185
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 improve real-time performance of agriculture vehicle navigation, an algorithm based on least square method for detection of crop rows, especially of crops in the early stage of growth was proposed. Crops were segmented from background by the index of G-R. Parts of the noises of weeds in the image were eliminated according to their length. Crop line numbers were detected dynamically by vertical projection method. Center points of crop rows were extracted as feature points and were classified into different clusters. Least square method was used twice for fitting the center line of crop row to the feature points. The number of the feature points was counted to judge the reliability of the detection result of crop row with plant deficiency. The experimental result showed that the algorithm could overcome the effect of weed noise and plant deficiency. The average time of image processing was less than 150 ms.
Number of references: 13
Main heading: Crops
Controlled terms: Agricultural machinery - Computer vision - Digital image storage - Image segmentation - Least squares approximations - Navigation
Uncontrolled terms: Center points - Crop rows - Crop rows detection - Feature point - Least square methods - Line detection - Machine vision - Real time performance - Stage of growth - Vehicle navigation - Vertical projection
Classification code: 731.6 Robot Applications - 741.1 Light/Optics - 741.2 Vision - 741.3 Optical Devices and Systems - 821.1 Agricultural Machinery and Equipment - 821.4 Agricultural Products - 921.6 Numerical Methods - 723.5 Computer Applications - 431.5 Air Navigation and Traffic Control - 434.4 Waterway Navigation - 655.1 Spacecraft, General - 716.3 Radio Systems and Equipment - 722.1 Data Storage, Equipment and Techniques - 722.4 Digital Computers and Systems - 723.2 Data Processing and Image Processing
DOI: 10.3969/j.issn.1000-1298.2010.07.034
Database: Compendex 8. Accession number: 20103213129031
Title: Aftereffects of rewatering after water stress on the rice growth
Authors: Hao, Shurong1 ; Guo, Xiangping2 ; Wang, Wenjuan2
Author affiliation: 1 Key Lab. of Efficient Irrigation-Drainage and Agricultural Soil-Water Environ. in Southern China, Ministry of Education, Hohai University, Nanjing 210098, China
2 College of Water Conservancy and Hydropower, Hohai University, Nanjing 210098, China
Corresponding author: Hao, S. (srhao@hhu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 76-79 49
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 research was carried out to determine the aftereffects of rewatering after water stress in the final rice growth stage by pot and test-pit experiments. The results show that the post-drought rewatering has obvious aftereffects in the initial rice growing stage, which is particularly significant after short-duration heavy drought at late tillering stage and light drought at early jointing stage. Moderate rewatering after water stress in initial rice growing stage can preserve large photosynthetic area, delay chlorophyll degradation, enable functional leaves to maintain high photosynthetic efficiency, which is eventually beneficial to dry matter accumulation during final rice growth stage.
Number of references: 11
Main heading: Plants (botany)
Controlled terms: Chlorophyll - Drought - Porphyrins
Uncontrolled terms: Chlorophyll degradation - Dry matter accumulation - Growth stages - Photosynthetic efficiency - Rewatering - Water stress
Classification code: 443.3 Precipitation - 444 Water Resources - 461.9 Biology - 801.2 Biochemistry - 804.1 Organic Compounds
DOI: 10.3969/j.issn.1000-1298.2010.07.016
Database: Compendex 9. Accession number: 20103213129037
Title: Design and experiment on microwave vacuum freeze drying equipment
Authors: Cao, Youfu1 ; Han, Qinghua1 ; Li, Shujun1 ; Yang, Bingnan1 ; Zhao, Qingliang1 ; Ma, Jiwei1
Author affiliation: 1 Chinese Academy of Agricultural Mechanization Sciences, Beijing 100083, China
Corresponding author: Li, S. (lisj@caams.org.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 105-108 127
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 overall structure, working principle and design points of microwave vacuum freeze drying equipment were described. A detailed analysis on microwave syntony cavity, microwave shielding structure and the design of glass vacuum cover was made. The specific structure and related parameters of main working parts were determined. The study on freeze drying of winter Chinese date showed that the equipment had the characteristics of rational structure, stable performance, and safe and reliable running process. Compared to the ordinary vacuum freeze-drying technology, it could produce the same quality product while saving 40.9% drying time and 55.86% energy.
Number of references: 10
Main heading: Drying
Controlled terms: Curing - Design - Experiments - Microwaves - Vacuum - Vacuum technology
Uncontrolled terms: Design points - Drying technology - Drying time - Freeze drying - Microwave-vacuum - Quality product - Running process - Working parts - Working principles
Classification code: 901.3 Engineering Research - 818.3 Rubber and Elastomer Processing - 815.1 Polymeric Materials - 802.3 Chemical Operations - 902.1 Engineering Graphics - 802.2 Chemical Reactions - 642.1 Process Heating - 633 Vacuum Technology - 408 Structural Design - 711 Electromagnetic Waves
DOI: 10.3969/j.issn.1000-1298.2010.07.022
Database: Compendex 10. Accession number: 20103213129035
Title: Optimal design and experiment of screw briquetting biomass fuel machine
Authors: Liu, Shengyong1 ; Yang, Guofeng1 ; Yang, Qunfa1 ; Wang, Sen2 ; Hua, Lei1 ; Wang, Xiaodong3
Author affiliation: 1 College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
2 Kaifeng China National Environmental Protection Ltd., Kaifeng 475002, China
3 The People's Government of Liuzhai Town Xinmi City, Zhengzhou 452370, China
Corresponding author: Liu, S. (liushy@vip.sina.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 96-100
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 analysis on the force and movement of biomass materials extruded by screw molding machine, disassembling the whole screw into the screw head and the main screw body, the molding sleeve into forming looper and Paul-type sleeve, and optimal design of the parameter of screw head which contains spiral leaves diameter D, blade pitch S, screw shaft diameter d, and the sleeve data was carried out. The tests showed that changing the screw head and forming looper was able to reduce the wear, the service life of the screw head and the main screw body was up to 90 h and 1000 h respectively, biomass briquette production was increased, production efficiency compared with the original machine increased 66.12 kg/h. The optimal design promoted the applications of biomass briquetting machine.
Number of references: 10
Main heading: Machine design
Controlled terms: Biomass - Briquetting - Experiments - Machinery - Molding - Optimal systems - Optimization
Uncontrolled terms: Biomass fuels - Biomass materials - Blade pitch - Molding machines - Optimal design - Optimization design - Production efficiency - Screw head - Shaft diameter
Classification code: 961 Systems Science - 921.5 Optimization Techniques - 901.3 Engineering Research - 821.5 Agricultural Wastes - 818.3 Rubber and Elastomer Processing - 816.1 Processing of Plastics and Other Polymers - 805.1.1 Biochemical Engineering - 802.3 Chemical Operations - 731.1 Control Systems - 601 Mechanical Design - 535.2 Metal Forming - 525.1 Energy Resources and Renewable Energy Issues - 524 Solid Fuels
DOI: 10.3969/j.issn.1000-1298.2010.07.020
Database: Compendex 11. Accession number: 20103213129052
Title: Greenhouse monitoring system based on wireless sensor networks
Authors: Guo, Wenchuan1 ; Cheng, Hanjie1 ; Li, Ruiming1 ; Lü, Jian1 ; Zhang, Haihui1
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: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 181-185
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 wireless sensor networks, a greenhouse environment monitoring system was designed to deal with problems in current greenhouse monitoring system, such as complicated cabling, high energy consumption, limited transmission distance, and inflexible deployment. With SoC of CC2430 and ZigBee protocol, environment information was collected, self-organized networks were realized and aggregated monitoring data was collected by the wireless sensor node. Gateway hardware platform was structured based on the S3C2410A microprocessor, and WinCE5.0 operating system was chosen as software platform. A gateway management system was developed on embedded database for sensor node administration, data processing, and early warning of weather disaster. Preliminary experimentations showed that the system met the application requirements of greenhouse monitoring system excellently, and had the advantages of low power consumption, inexpensiveness, flexibility, extensibility, and friendly human-machine interface.
Number of references: 11
Main heading: Monitoring
Controlled terms: Computer operating systems - Data processing - Electric network synthesis - Gateways (computer networks) - Greenhouses - Man machine systems - Network protocols - Sensor networks - Sensor nodes - Telecommunication equipment - Wireless sensor networks
Uncontrolled terms: Application requirements - Early warning - Embedded database - Environment information - Greenhouse environment - Hardware platform - High energy consumption - Human Machine Interface - Low-power consumption - Management systems - Monitoring system - Operating systems - Self-organized networks - Software platforms - Transmission distances - Wireless sensor node - Zig-Bee
Classification code: 723.2 Data Processing and Image Processing - 731.1 Control Systems - 732 Control Devices - 821.6 Farm Buildings and Other Structures - 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 - 961 Systems Science - 723 Computer Software, Data Handling and Applications - 402.1 Industrial and Agricultural Buildings - 703.1.2 Electric Network Synthesis - 716 Telecommunication; Radar, Radio and Television - 716.3 Radio Systems and Equipment - 717 Optical Communication - 718 Telephone Systems and Related Technologies; Line Communications - 722 Computer Systems and Equipment - 722.3 Data Communication, Equipment and Techniques - 722.4 Digital Computers and Systems
DOI: 10.3969/j.issn.1000-1298.2010.07.037
Database: Compendex 12. Accession number: 20103213129039
Title: Effects of different CO2 volumefraction on fruit browning and quality of 'Whangkeumbae' during controlled atmosphere storage
Authors: Wang, Zhihua1 ; Ding, Dandan1 ; Wang, Wenhui1 ; Shen, Chunmiao1 ; Jiang, Yunbin1 ; Tong, Wei1
Author affiliation: 1 Research Institute of Pomology, Chinese Academy of Agricultural Sciences, Xingcheng 125100, China
Corresponding author: Wang, W. (wenhuiw@263.net)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 114-118
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract: With 3% O2 concentration, effects of different CO2 concentrations on fruit quality, post-harvest physiology and tissue browning of 'Whangkeumbae' were investigated by using accurate CA match air equipments during shelf-life days. The results showed that different treatments of controlled atmosphere (CA) could delay declining of fruit firmness. Furthermore, under the treatment at CO2 concentration of zero, the fruit respiration rate and polygalacturonase (PG) activity were obviously inhibited by CA and there were no browning reaction on the pericarp and pulp with high firmness and good flavor of fruit after 180 days storage. Under 0.5% CO2 concentration treatment, there was light pulp browning. According to the experiment, 3% O2 and CO2 concentration of 0~0.5% was optimal condition for CA storage of 'Whangkeumbae'. 'Whangkeumbae' pear is sensitive to CO2. When CO2 concentration was more than 1% the fruit browning were more serious with increasing of concentration of CO2. The results also indicated that PPO activity and the content of ethanol were important factors of browning reaction in 'Whangkeumbae' pear.
Number of references: 16
Main heading: Fruits
Controlled terms: Concentration (process) - Ethanol - Physiology - Tissue
Uncontrolled terms: Browning reactions - Concentration of - Controlled atmosphere - Controlled atmosphere storage - Fresh-keeping - Fruit firmness - Fruit quality - Keeping quality - Optimal conditions - Polygalacturonase - Postharvest - Respiration rate - Shelf life - Tissue browning
Classification code: 461.2 Biological Materials and Tissue Engineering - 461.9 Biology - 523 Liquid Fuels - 802.3 Chemical Operations - 804.1 Organic Compounds - 821.4 Agricultural Products
DOI: 10.3969/j.issn.1000-1298.2010.07.024
Database: Compendex 13. Accession number: 20103213129057
Title: Simulation of stress intensity factors and critical crack length of surface oblique crack on round tube
Authors: Zhu, Mingyi1 ; Li, Cheng2 ; Tie, Ying2
Author affiliation: 1 Department of Automobile, Henan Mechanical and Electrical Engineering College, Xinxiang 450002, China
2 School of Mechanical Engineering, Zhengzhou University, Zhengzhou 450001, China
Corresponding author: Li, C. (chengli@zzu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 210-213 222
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract: Calculation models were established based on the elastic fracture theory and complex function theory for the surface oblique crack on round tube. Change in stress intensity factors and critical crack length were investigated when surface oblique crack on round tube developing propagation considering different influencing factors. Take crack type-I and type-II for example, by using the strain energy density theory, a complete analysis was performed. The influence of crack initiation angle, crack angle and size on the stress intensity factors was calculated. The influence curves of crack angle on two stress intensity factors of the mixed-mode crack were obtained. Then, the influence extent was compared. Moreover, the complete analysis on the influence which cracked initiation angle, crack angle on the critical crack length was performed. The results showed that with the increase of the crack angle, the maximal and minimal values of the two stress intensity factors (KI, KII) were same, however, the tendency was opposite. Moreover, to type-I crack, the stress intensity factors on the position of β=0 and β=2π were equal to zero.
Number of references: 7
Main heading: Cracks
Controlled terms: Asphalt pavements - Strain energy - Stress intensity factors - Welds
Uncontrolled terms: Calculation models - Complex functions - Crack angles - Crack initiation angles - Critical crack lengths - Elastic fracture - Influencing factor - Initiation angle - Minimal value - Mixed-mode cracks - Oblique cracks - Round tubes - Strain energy density
Classification code: 406.2 Roads and Streets - 411.1 Asphalt - 421 Strength of Building Materials; Mechanical Properties - 422 Strength of Building Materials; Test Equipment and Methods - 538.2 Welding - 931.1 Mechanics
DOI: 10.3969/j.issn.1000-1298.2010.07.042
Database: Compendex 14. Accession number: 20103213129032
Title: Analysis of filtering time and sewage time for automatic suction screen filter
Authors: Liu, Huanfang1 ; Zheng, Tiegang1, 2 ; Liu, Fei1 ; Zong, Quanli1
Author affiliation: 1 College of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi 832003, China
2 College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
Corresponding author: Liu, H. (Lhf0818@shz.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 80-83
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract: The filter in micro-irrigation is the key to guarantee normal running of the whole micro-irrigation system. It is the key to develop automatic filter. Based on the research of hydraulic performance of drain system for automatic suction screen filter, the discipline of filtering time for automatic suction screen filter was analyzed. It showed that the change of filtering time was not linear. The factors affecting sewage time were analyzed. The results showed that the cleaning-time was not the constant value, but had the inverse relation with inflow sediment concentration S0 when other parameters were constant.
Number of references: 9
Main heading: Irrigation
Controlled terms: Cleaning - Sewage
Uncontrolled terms: Automatic filters - Filter - Hydraulic performance - Inverse relations - Microirrigation - Microirrigation systems - Screen filters - Sediment concentration
Classification code: 452.1 Sewage - 453.1 Water Pollution Sources - 802.3 Chemical Operations - 821.3 Agricultural Methods
DOI: 10.3969/j.issn.1000-1298.2010.07.017
Database: Compendex 15. Accession number: 20103213129051
Title: Application of electromagnetic induction (EM38) and variance quad-tree (VQT) method on spatial sampling scheme in coastal saline region
Authors: Yao, Rongjiang1 ; Yang, Jingsong1 ; Zhao, Xiufang1 ; Li, Xiaoming1 ; Liu, Meixian1
Author affiliation: 1 Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
Corresponding author: Yang, J. (jsyang@issas.ac.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 174-180
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract: Electromagnetic induction (EM38) and variance quad-tree (VQT) were both applied in the field of the coastal reclamation area in north Jiangsu Province. Apparent soil electrical conductivity (ECa) measured with EM38 was used as an ancillary variable of soil salinity, and the spatial distribution of ECa was used as priori information. The optimized sampling pattern of soil salinity was designed and validated by using VQT method, and the precision of the sampling design was evaluated. Results showed that the kriged spatial distribution map of the VQT scheme was highly similar to the kriged map of total sampling sites, while sampling quantity of the former was almost 1/2 of that of the latter. With the same sampling quantity, the kriged map of VQT scheme was more similar to the kriged map of total sites than that of grid sampling scheme. With the same mapping accuracy, the sampling quantity of the VQT scheme was less than that of grid sampling scheme. Under the condition of permitted maximum difference index of 10%, the sampling efficiency of VQT method could be improved by 17.3%. The advantage of the VQT method was that the scheme sampled sparsely or intensively in terms of variability in local parts of the study area. The associated application of EM38 and VQT method provided efficient tools and theoretical basis for saving cost and improving efficiency in coastal saline region.
Number of references: 19
Main heading: Soils
Controlled terms: Damping - Electric conductivity - Electromagnetic induction - Inductance measurement - Magnetic materials - Salinity measurement - Size distribution
Uncontrolled terms: Coastal saline - Coastal saline region - Quad trees - Soil sampling - Spatial variability
Classification code: 943.3 Special Purpose Instruments - 708.4 Magnetic Materials - 922.2 Mathematical Statistics - 931.1 Mechanics - 931.2 Physical Properties of Gases, Liquids and Solids - 933.1 Crystalline Solids - 942.2 Electric Variables Measurements - 701.2 Magnetism: Basic Concepts and Phenomena - 531.2 Metallography - 483.1 Soils and Soil Mechanics - 471.4 Seawater, Tides and Waves - 444 Water Resources - 423 Non Mechanical Properties and Tests of Building Materials - 701.1 Electricity: Basic Concepts and Phenomena
DOI: 10.3969/j.issn.1000-1298.2010.07.036
Database: Compendex 16. Accession number: 20103213129055
Title: Modular division oriented to reconfigurable machine tools
Authors: Huang, Hua1 ; Li, Aiping1 ; Xu, Liyun1
Author affiliation: 1 Institute of Advanced Manufacturing Technology, Tongji University, Shanghai 201804, China
Corresponding author: Huang, H. (hh318872@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 198-204
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 flexible modular division method was proposed to the reconfigurable machine tools (RMT) considered the influence of customer demand, the structure-function and life cycle effect. Analytic hierarchy process (AHP) was used to weight the different influence factors and the interaction among the machine tool parts and the related matrix were obtained. The fuzzy clustering method was used to operate the matrix. The control system was modular divided based on the specialty of RMT. The proposal for RMT modular division was obtained and could be used as the foundation of RMT developing.
Number of references: 12
Main heading: Machine tools
Controlled terms: Decision theory - Fuzzy clustering - Fuzzy control - Fuzzy systems - Hierarchical systems
Uncontrolled terms: Customer demands - Fuzzy clustering method - Influence factors - matrix - Modular division - Reconfigurable machine tool - Reconfigurable machine tools - Related matrices
Classification code: 961 Systems Science - 922.2 Mathematical Statistics - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory - 921 Mathematics - 731.1 Control Systems - 731 Automatic Control Principles and Applications - 723.4 Artificial Intelligence - 723 Computer Software, Data Handling and Applications - 603.1 Machine Tools, General
DOI: 10.3969/j.issn.1000-1298.2010.07.040
Database: Compendex 17. Accession number: 20103213129034
Title: Effects of different planting patterns on water use efficiency and marginal profits of winter wheat
Authors: Li, Quanqi1, 2 ; Chen, Yuhai2 ; Zhou, Xunbo2 ; Yu, Songlie2
Author affiliation: 1 College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Taian 271018, China
2 National Key Laboratory of Crop Biology, Shandong Agricultural University, Taian 271018, China
Corresponding author: Chen, Y. (yhchen@sdau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 90-95
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 Shandong Province, water shortage is the most important problem for winter wheat production. Four planting patterns, i.e., uniform row, ″20 40″ wide-narrow row, ″20 40″ furrow planting, and ″20 40″ bed planting patterns which were widely used in Shandong Province were selected for the experiment to study the effect of planting patterns on water use efficiency (WUE) and marginal profits of winter wheat. The results indicated that the max yield of uniform row, wide-narrow row, furrow planting and bed planting were 7778.6, 7624.8, 8684.6 and 8893.7 kg/hm2 respectively. But, if get the max yield, evapotranspiration of bed planting pattern was higher than that of furrow planting pattern by 76.6 mm. The max WUE of furrow planting was lower than those of uniform row and wide-narrow row planting, so did bed planting. But if get the max WUE yield and evapotranspiration of furrow planting pattern was 7858.8 kg/hm2 and 407.5 mm respectively, they were all significantly higher than those of uniform row, wide-narrow row and bed planting patterns. Take the water resource use efficiency and marginal profits as a whole, furrow planting pattern irrigated at jointing and heating growth stages could get the highest netincome, under these conditions, yield was 8186.3 kg/hm2, irrigation amount was 120 mm, evapotranspiration was 423.5 mm, and WUE was 19.3 kg/(hm2 · mm). The experiment showed that under water deficit, furrow planting was the most appropriate planting patterns in Shandong Province.
Number of references: 18
Main heading: Agriculture
Controlled terms: Biochemical oxygen demand - Earnings - Evapotranspiration - Experiments - Natural resources management - Plants (botany) - Profitability - Water supply
Uncontrolled terms: Bed planting - Growth stages - Marginal profit - Shandong province - Under water - Water shortages - Water-use efficiency - Winter wheat
Classification code: 901.3 Engineering Research - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 802.3 Chemical Operations - 461.9 Biology - 454 Environmental Engineering - 911.2 Industrial Economics - 453 Water Pollution - 452.2 Sewage Treatment - 446.1 Water Supply Systems - 444.1 Surface Water - 444 Water Resources - 452.4 Industrial Wastes Treatment and Disposal
DOI: 10.3969/j.issn.1000-1298.2010.07.019
Database: Compendex 18. Accession number: 20103213129045
Title: Extracting technology and antioxidant activity of bioactive components from lotus leaf
Authors: Jiang, Shenhua1, 2 ; Ma, Haile2 ; Wang, Changlu3 ; Wang, Zhenbin2 ; Li, Yongzhuan2 ; Liao, Liang1
Author affiliation: 1 College of Life Science, Jiujiang University, Jiujiang 332000, China
2 School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
3 Key Laboratory of Food Nutrition and Safety, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
Corresponding author: Liao, L. (liaol58@yahoo.com.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 141-146
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 extracting technology and antioxidant activities of lotus leaf were studied. The results showed that the optimal parameters of the extracting technology were the extracting time was 50 min, the extracting temperature was 80°C, the concentration of ethanol was 60% and the ratio of sample to extracting solution was 1:20. The ethyl acetate fraction possessed the strongest antioxidant activities (P < 0.001 or P < 0.01), i. e., the reducing power, FRAP value and DPPH radicals scavenging capacity among the four increasing polar fractions (hexane, ethyl acetate, butanol and aqueous fractions) through the bio-assay guided method. The OD593 values and DPPH radicals scavenging capacities of this fraction were better than those of the positive controls of BHT and GBE (P < 0.05) through the experiments of verification.
Number of references: 19
Main heading: Extraction
Controlled terms: Bioassay - Esters - Ethanol - Hexane - Technology
Uncontrolled terms: Antioxidant activities - Antioxidant activity - Aqueous fractions - Bioactive components - Concentration of - Ethyl acetates - Lotus leaf - Optimal parameter - Polar fraction - Reducing power - Scavenging capacity
Classification code: 461.6 Medicine and Pharmacology - 523 Liquid Fuels - 801 Chemistry - 802.3 Chemical Operations - 804.1 Organic Compounds - 901 Engineering Profession
DOI: 10.3969/j.issn.1000-1298.2010.07.030
Database: Compendex 19. Accession number: 20103213129059
Title: Electrical discharge truing/dressing technology of non-electrical super-abrasive grinding wheels
Authors: Cai, Lanrong1 ; Yang, Hui1 ; Yan, Liwen1 ; Hu, Dejin2
Author affiliation: 1 Key Laboratory of High Speed Cutting and Precision Machining, Tianjin University of Technology and Education, Tianjin 300222, China
2 School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
Corresponding author: Cai, L. (cailr2003@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 219-222
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract: A novel electrical discharge truing/dressing (EDD) technology which could dress non-electrical super-abrasive grinding wheels such as resin-bonded diamond wheel and vitrified CBN wheel by means of covering electrical material on the surface of wheel was proposed. The principle of removing non-electrical bond during MEDD process was illustrated. The resin-bonded diamond wheel topographies prior and after electrical discharge dressing were observed by VH800 3-D digital microscope. The results of electrical discharge dressing under different discharge current (ie) and discharge duration (te) were compared. Experimental results indicate that the proposed EDD method is applicable to non-electrical bond wheels. In addition, discharge current has direct influence on the wheel surface topography and the performance of diamond grains. As well as, pulse duration has less influence on the wheel surface topography. The experimental results also reveal that the appropriative discharge current (ie) in dressing resin-bonded diamond wheel process is less than 3 A.
Number of references: 5
Main heading: Wheel dressing
Controlled terms: Abrasives - Diamond cutting tools - Diamonds - Digital devices - Electric discharges - Grinding (machining) - Grinding machines - Grinding mills - Grinding wheels - Precision engineering - Resins - Surface topography - Surfaces - Topography - Vehicles
Uncontrolled terms: Diamond grains - Diamond wheel - Digital microscopes - Discharge currents - Discharge duration - Electrical discharge - Electrical discharge grinding - Electrical discharges - Electrical materials - Pulse durations
Classification code: 951 Materials Science - 714.2 Semiconductor Devices and Integrated Circuits - 721 Computer Circuits and Logic Elements - 741.3 Optical Devices and Systems - 761 Nanotechnology - 801.4 Physical Chemistry - 802.1 Chemical Plants and Equipment - 815.1.1 Organic Polymers - 902.2 Codes and Standards - 931 Classical Physics; Quantum Theory; Relativity - 931.2 Physical Properties of Gases, Liquids and Solids - 713.5 Other Electronic Circuits - 405.3 Surveying - 432 Highway Transportation - 481.1.1 Geomorphology - 482.2.1 Gems - 701.1 Electricity: Basic Concepts and Phenomena - 603.1 Machine Tools, General - 605 Small Tools and Hardware - 606.1 Abrasive Materials - 606.2 Abrasive Devices and Processes - 604.2 Machining Operations
DOI: 10.3969/j.issn.1000-1298.2010.07.044
Database: Compendex 20. Accession number: 20103213129026
Title: Soil flow rule and dynamic performance under a paddy-field wheel lug
Authors: Lu, Huazhong1 ; Luo, Xiwen1
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: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 50-53
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 lug is the basic element of a paddy-field lugged wheel. Soil flowed under the lug develops the pull and lift forces on the lug. In a set of specially designed soil box, the soil flow under the lug was photographed and the soil reaction forces on the lug were measured. Firstly, soil flow track, flow mode and flow zone under a lug were studied. The effects of the pull force, lift force and driving efficiency and their relationship with the soil flow in the interaction between the soil and lug were analyzed. The cause of low driving efficiency was further studied for the lug with slip and deep sinkage.
Number of references: 9
Main heading: Soils
Controlled terms: Mechanisms - Wheels
Uncontrolled terms: Basic elements - Dynamic performance - Flow modes - Lift force - Pull force - Soil flow - Soil reaction forces
Classification code: 483.1 Soils and Soil Mechanics - 601.2 Machine Components - 601.3 Mechanisms
DOI: 10.3969/j.issn.1000-1298.2010.07.011
Database: Compendex 21. Accession number: 20103213129046
Title: Enzymatic hydrolysis technology for ACE-inhibitory peptides from egg white
Authors: Liu, Jingbo1 ; Yu, Zhipeng1 ; Zhao, Wenzhu1 ; Lin, Songyi1
Author affiliation: 1 College of Quartermaster Technology, Jilin University, Changchun 130062, China
Corresponding author: Liu, J. (ljb168@sohu.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 147-152 113
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: Antihypertensive peptides were derived from egg white, and then were purified and their primary structure was identified. Egg white hydrolysis process model was established by examining the substrate concentration, E/S, hydrolysis temperature and pH value on the impact of the hydrolysis degree, combined with multivariate linear regression combination of design and quadratic regression orthogonal design. Hydrolysates were purified by gel chromatography, and were characterized by liquid chromatography tandem mass spectrometry. The results showed that the optimal enzymatic hydrolysis process was the substrate concentration of 8%, pH value of 10.73, E/S of 12.14% and temperature of 56.80°C. Hydrolysates were purified by sephadex G-25, the 50% inhibitory concentration as 0.18 mg/mL. Liquid chromatography-quadrupole-linear ion trap tandem mass spectrometry confirmed the structure of the active peptides in the component, the amino acid sequences were Arg-Val-Pro-Ser-Leu-Met, Thr-Pro-Ser-Pro-Arg, and Asp-Leu-Gln-Gly-Lys, respectively.
Number of references: 13
Main heading: Enzymatic hydrolysis
Controlled terms: Amino acids - Gels - Ion exchange - Liquid chromatography - Liquids - Mass spectrometry - Optimization - Organic acids - Peptides - pH effects - Purification - Structural design
Uncontrolled terms: ACE-inhibitory - ACE-inhibitory peptides - Active peptides - Amino acid sequence - Egg white - Egg white protein - Egg white proteins - Gel chromatography - Hydrolysis degree - Inhibitory concentration - Linear ion trap - Liquid chromatography-tandem mass spectrometry - Multivariate linear regressions - Orthogonal design - pH value - Primary structures - Process model - Quadratic regression - Quadrupoles - Sephadex - Substrate concentrations
Classification code: 943.3 Special Purpose Instruments - 802.2 Chemical Reactions - 802.3 Chemical Operations - 804 Chemical Products Generally - 804.1 Organic Compounds - 921.5 Optimization Techniques - 931.2 Physical Properties of Gases, Liquids and Solids - 801.3 Colloid Chemistry - 801.1 Chemistry, General - 801 Chemistry - 461.9 Biology - 461 Bioengineering and Biology - 408.1 Structural Design, General - 801.2 Biochemistry
DOI: 10.3969/j.issn.1000-1298.2010.07.031
Database: Compendex 22. Accession number: 20103213129050
Title: Rice seeds selection based on machine vision
Authors: Chen, Bingqi1 ; Sun, Xudong2 ; Han, Xu1 ; Liu, Yande2
Author affiliation: 1 College of Engineering, China Agricultural University, Beijing 100083, China
2 School of Mechatronics Engineering, East China Jiaotong University, Nanchang 330013, China
Corresponding author: Chen, B. (cbq93@sohu.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 168-173 180
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract: The area and wide length ratio was chosen as the characteristic parameters for different kinds of rice seeds, and a database of rice seeds' type was constructed. The equivalence rectangle's length and the least wide difference were used as standard to identify unknown rice seeds' type. The disrepair of the rice seeds was identified based on the times of the black pixels change to the white pixels on one scan line and the number of scan lines. The mildew of rice seeds was identified based on the difference of area obtained by two different thresholds. Ten kinds of rice seed samples like Fengyuanyou 299 were chosen for the experiments. During the experiments, inspection of seeds' type, identification of seeds in work positions, geometry parameters of seeds, mildew and disrepair situations of seeds were done respectively. The accuracy was 100%, 91.4%, 88.9% and 76.8% respectively.
Number of references: 18
Main heading: Seed
Controlled terms: Computer vision - Fungi - Imaging systems - Pixels
Uncontrolled terms: Black pixels - Characteristic parameter - Geometry parameter - Length ratio - On-machines - Rice seed - Scan line - Selection based
Classification code: 821.4 Agricultural Products - 801.2 Biochemistry - 746 Imaging Techniques - 742.2 Photographic Equipment - 741.2 Vision - 741 Light, Optics and Optical Devices - 731.6 Robot Applications - 723.5 Computer Applications - 723.2 Data Processing and Image Processing - 722.2 Computer Peripheral Equipment - 461.9 Biology
DOI: 10.3969/j.issn.1000-1298.2010.07.035
Database: Compendex 23. Accession number: 20103213129058
Title: Dynamic performance indices analysis of 4-SPS-1-S spatial rotation parallel manipulator
Authors: Cui, Guohua1 ; Li, Quancai2 ; Zhang, Yanwei1 ; Hou, Hongjuan1
Author affiliation: 1 College of Mechanical Engineering, Hebei Engineering University, Handan 056038, China
2 College of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
Corresponding author: Cui, G. (ghcui2007@yahoo.com.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 214-218
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: Dynamic performance indices of a spatial rotation 4-SPˉS-1-S parallel manipulator has been studied. The 4-SPˉS-1-S parallel manipulator has spatial three pure rotation degrees of freedom, including four SPS active legs and one passive constraining leg. Based on the velocity mapping equations of the mechanism, Jacobian matrices were built and computed. The dynamic performance indices which include load capacity performance and actuating performance were introduced and defined, and analysis equation for assessing the load capacity and actuating performance of the parallel manipulator mechanism was built. Finally a numerical example was provided for analyzing the dynamic performance indices distribution rules over the entire workspace.
Number of references: 10
Main heading: Rotation
Controlled terms: Jacobian matrices - Magnetoelectric effects - Manipulators - Mechanisms
Uncontrolled terms: Degrees of freedom - Distribution rule - Dynamic performance - Load capacity - Numerical example - Parallel manipulators - Parallel mechanisms - Performance dynamics - Pure-rotation - Spatial rotation - Velocity mapping
Classification code: 921.1 Algebra - 731.5 Robotics - 701.2 Magnetism: Basic Concepts and Phenomena - 931.1 Mechanics - 701.1 Electricity: Basic Concepts and Phenomena - 601.3 Mechanisms - 601.1 Mechanical Devices - 691.1 Materials Handling Equipment
DOI: 10.3969/j.issn.1000-1298.2010.07.043
Database: Compendex 24. Accession number: 0103213129040
Title: Nondestructive test of major internal components for Fushi apple during storage based on CT technology
Authors: Zhang, Jingping1 ; Liu, Kongxuan1
Author affiliation: 1 College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310029, China
Corresponding author: Zhang, J. (zhjpzhjp@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 119-122
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: Change of the linear relationship between CT value and major internal components of Fushi apple during storage period was discussed. CT images and CT value were acquired by scanning the section of Fushi apples, and the model of linear relationships between CT value and major internal components was established. The linear relationships in different storage time were compared. It's clear that the pH value and sugar content increased with the growth of storage time, while moisture content and titrable acidity decreased. The linear relationships have been changed during the storage period. So the storage time was introduced into the predicting model, which was used to predict the internal components of Fushi apple. The predicting model was proved to be accurate and feasible.
Number of references: 14
Main heading: Computerized tomography
Controlled terms: Forecasting - Fruits - Nondestructive examination - Sugar (sucrose)
Uncontrolled terms: CT Image - CT technology - CT-value - Linear relationships - Moisture contents - Non-destructive test - pH value - Predicting models - Storage periods - Storage time - Sugar content - Titrable acidity
Classification code: 921 Mathematics - 912.2 Management - 822.3 Food Products - 821.4 Agricultural Products - 801 Chemistry - 922.2 Mathematical Statistics - 723.5 Computer Applications - 461.1 Biomedical Engineering - 423.2 Test Methods - 422.2 Test Methods - 421 Strength of Building Materials; Mechanical Properties - 531 Metallurgy and Metallography
DOI: 10.3969/j.issn.1000-1298.2010.07.025
Database: Compendex 25. Accession number: 20103213129054
Title: 3-D mixed-layout conceptual design based on multi-objective improved ant colony algorithm
Authors: Zhang, Hong1 ; Li, Aiping1 ; Liu, Xuemei1
Author affiliation: 1 Institute of Advanced Manufacturing Technology, Tongji University, Shanghai 200092, China
Corresponding author: Zhang, H. (zhanghong7921@gmail.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 191-197 209
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 layout model representation method based on space partition method was established to solve the 3-D mixed layout design. Linear octree and raster data model were used in conversion model for corresponding cylinders layout objects and cuboids layout objects respectively. The filled ball group was proposed for the layout model representation method, and on this foundation, the mathematical model of the layout optimization problem was obtained according to the layout design requirements. Then the TSP problem was transformed into the layout design problem by establishing directed layout sequence. Meanwhile, the fitness function was applied to deal with the multi-objective optimization in the course of the layout, and the improved ant colony algorithm was put into use to gain the Pareto optimum. At last, the effectiveness of the layout method for modeling and optimization algorithm was illustrated by the comparison of the layout design schemes.
Number of references: 9
Main heading: Algorithms
Controlled terms: Conceptual design - Function evaluation - Health - Mathematical models - Multiobjective optimization - Surface structure - Three dimensional
Uncontrolled terms: Ant colony algorithms - Conversion model - Fitness functions - Improved ant colony algorithm - Layout designs - Layout methods - Layout model - Layout optimization - Linear octree - Modeling and optimization - Multi objective - Pareto optima - Raster data - Space partition method - TSP problems
Classification code: 951 Materials Science - 931.2 Physical Properties of Gases, Liquids and Solids - 921.6 Numerical Methods - 921.5 Optimization Techniques - 921 Mathematics - 914.3 Industrial Hygiene - 902.1 Engineering Graphics - 723.5 Computer Applications - 723 Computer Software, Data Handling and Applications - 461.6 Medicine and Pharmacology - 408 Structural Design
DOI: 10.3969/j.issn.1000-1298.2010.07.039
Database: Compendex 26. Accession number: 20103213129048
Title: PID control strategy of the variable rate fertilization control system
Authors: Liang, Chunying1 ; Yi, Shujuan1 ; Wang, Xi2 ; Huai, Baofu1
Author affiliation: 1 College of Information and Technology, Heilongjiang Bayi Agricultural University, Daqing 163319, China
2 College of Engineering, Heilongjiang Bayi Agricultural University, Daqing 163319, China
Corresponding author: Yi, S. (yishujuan_2005@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 157-162
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract: The mathematical model of the variable rate fertilization control system according to the principles of mechanical and electrical dynamics was set up and the theoretical basis for the system design, parameter selection and performance improvement was provided. The simulation model with direct current servo motor driving variable transmission mechanism was constructed by using Matlab/Simulink dynamic simulation tools. PID parameter tuning of control system was carried out by the critical proportioning method, the simulation curves of system performance was obtained. The simulation results showed that PID control strategy could improve the control system tracking performance and anti-jamming performance, and the test was carried out to verify the system performance.
Number of references: 17
Main heading: Mathematical models
Controlled terms: Computer simulation - Control theory - Dynamics - Pneumatic control equipment - Proportional control systems - Three term control systems - Tuning - Two term control systems
Uncontrolled terms: Anti jamming performance - Direct current servo - Dynamic simulation tool - MATLAB /simulink - Parameter selection - Performance improvements - PID control - PID parameters - Simulation curves - Simulation model - Simulation result - System design - Theoretical basis - Variable rate fertilization
Classification code: 921 Mathematics - 744.1 Lasers, General - 732.1 Control Equipment - 731.1 Control Systems - 931.1 Mechanics - 723.5 Computer Applications - 716.3 Radio Systems and Equipment - 713 Electronic Circuits - 632.4 Pneumatic Equipment and Machinery - 716.4 Television Systems and Equipment
DOI: 10.3969/j.issn.1000-1298.2010.07.033
Database: Compendex 27. Accession number: 20103213129025
Title: Research on indoor soil bin and test system for rheological soil tillage
Authors: Zhai, Lixin1 ; Ji, Changying1 ; Ding, Qishuo1
Author affiliation: 1 College of Engineering, Nanjing Agricultural University, Nanjing 210031, China
Corresponding author: Ji, C. (chyji@njau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 45-49
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 simulating test is the important means and method to reduce cost and raise efficiency of new type of farm machinery design. According to the actual working circumstances of farm machinery in the paddy field, a trial soil bin which could imitate actual work in field was designed. The project and process of the soil bin design were introduced briefly. The methods to resolve the problems such as how to make the wet soil and how to control the water content of soil were proposed; based on the analysis of the functions and characteristics of the soil bin, experimental data sampling system was developed.
Number of references: 19
Main heading: Soils
Controlled terms: Agricultural machinery - Agriculture - Bins - Cost reduction - Data acquisition - Machine design - Water content
Uncontrolled terms: Bin design - Data collecting - Experimental data - Farm machinery - In-field - Paddy fields - Paddy soil - Paddy soils - Simulating test - Soil tillage - Test systems - Wet soil
Classification code: 912.2 Management - 911.2 Industrial Economics - 821.1 Agricultural Machinery and Equipment - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 723.2 Data Processing and Image Processing - 694.4 Storage - 601 Mechanical Design - 483.1 Soils and Soil Mechanics - 444 Water Resources
DOI: 10.3969/j.issn.1000-1298.2010.07.010
Database: Compendex 28. Accession number: 20103213129027
Title: Design and application of crop automatic target detection device
Authors: Li, Li1, 2 ; Song, Jianli1 ; He, Xiongkui1
Author affiliation: 1 College of Science, China Agricultural University, Beijing 100193, China
2 Department of Industry Engineering, Binzhou Vocational College, Binzhou 256603, China
Corresponding author: He, X. (xiongkui@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 54-56 63
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 infrared detecting system was hard to work well in short detectable distance and complex circuit. The double-infrared emission was adopted for improving the optical path and increasing the receiving area. The optic circuit of infrared detecting system for automatic target spraying was also improved by changing the whole detecting device into separated parts, by which increased portability and transferability of infrared detecting system for automatic target spraying. Test results showed that the detection performance increased by 48.96%, sensitivity of the space between two spraying targets increased by 12.04%.
Number of references: 9
Main heading: Targets
Controlled terms: Crops - Design - Infrared radiation - Radiometers - Target drones
Uncontrolled terms: Automatic target detection - Complex circuits - Design and application - Detecting devices - Detection performance - Infrared detecting - Infrared emissions - Optical path - Space between - Target detection - Test results
Classification code: 932.1.1 Particle Accelerators - 902.1 Engineering Graphics - 821.4 Agricultural Products - 944.7 Radiation Measuring Instruments - 741.1 Light/Optics - 408 Structural Design - 404.1 Military Engineering - 652.1.2 Military Aircraft
DOI: 10.3969/j.issn.1000-1298.2010.07.012
Database: Compendex 29. Accession number: 20103213129056
Title: 4-axis CNC spiral bevel gear machine tooth-profile lengthwise curvature modification
Authors: Zhang, Hua1 ; Cao, Xuemei1 ; Deng, Xiaozhong1 ; Wei, Bingyang1
Author affiliation: 1 School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang 471003, China
Corresponding author: Wei, B. (bywei1966@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 205-209
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 traditional machine, to modify spiral bevel gear tooth-profile lengthwise curvature, cutter must be disassembled and adjusted its diameter. This is a complicated process. On domestic-made 4-axis CNC spiral bevel gear machine, machining coordinates were set up, cradle radial setting and roll ratio polynomials were proposed. With tooth contact analysis (TCA) technology, considering contact lines and transmission errors, the polynomials were taken into TCA process to study lengthwise curvature correcting rules. TCA and milling experiment showed that lengthwise curvature modification could be achieved without changing cutter diameter, contact lines and transmission error could be controlled more easily.
Number of references: 11
Main heading: Bevel gears
Controlled terms: Dentistry - Error detection - Gear teeth - Machining - Spur gears
Uncontrolled terms: Contact lines - Spiral bevel gear machine - Spiral bevel gears - Tooth contact analysis - Transmission error
Classification code: 461.1 Biomedical Engineering - 461.6 Medicine and Pharmacology - 462.3 Dental Equipment and Supplies - 601.2 Machine Components - 604.2 Machining Operations - 721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory
DOI: 10.3969/j.issn.1000-1298.2010.07.041
Database: Compendex 30. Accession number: 20103213129020
Title: 2-D load spectrum for motor propulsion system on hybrid electric vehicle
Authors: Li, Wen1 ; Zhang, Chengning1 ; Song, Qiang1 ; Wang, Zhifu1 ; Wu, Xiaohua1
Author affiliation: 1 National Engineering Laboratory for Electric Vehicle, Beijing Institute of Technology, Beijing 100081, China
Corresponding author: Li, W. (l_wen@yahoo.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 21-24 29
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 2-D load spectrum program based on rain-flow counting method was compiled in Matlab environment. The program was used not only in statistical treatment of load time history of motor propulsion system on hybrid electric vehicle (HEV) and getting rain-flow matrix, but also in hypothesis test for both amplitude and mean value distribution. 2-D distribution function was obtained after the independence and relevance tests of the amplitude and mean value. 2-D load spectrum was set up for traction motor propulsion system on HEV used in bench experiments.
Number of references: 8
Main heading: Electric load distribution
Controlled terms: Automobiles - Distribution functions - Electric vehicles - Fuzzy control - Rain - Secondary batteries - Spacecraft propulsion - Statistical tests
Uncontrolled terms: Bench experiment - Hybrid electric vehicle - Hypothesis tests - Load spectrum - MATLAB environment - matrix - Mean values - Propulsion system - Statistical treatment - Time history
Classification code: 702.1.2 Secondary Batteries - 706.1.2 Electric Power Distribution - 723.4 Artificial Intelligence - 731 Automatic Control Principles and Applications - 921 Mathematics - 922.1 Probability Theory - 922.2 Mathematical Statistics - 682.1.2 Locomotives - 432 Highway Transportation - 443.3 Precipitation - 654 Rockets and Rocket Propulsion - 655.1 Spacecraft, General - 656.1 Space Flight - 662.1 Automobiles - 662.2 Smaller Vehicles
DOI: 10.3969/j.issn.1000-1298.2010.07.005
Database: Compendex 31. Accession number: 20103213129041
Title: Effect of two types of high voltage electric field treatments on the storage quality of mature green tomato fruit
Authors: Wang, Yu1 ; Wang, Baogang2 ; Li, Lite3
Author affiliation: 1 College of Food Science and Engineering, Shanxi Agricultural University, Taigu 030801, China
2 Institute of Forestry and Pomology, Beijing Academy of Agriculture and Forestry, Beijing 100093, China
3 College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
Corresponding author: Wang, Y. (sxtgwy@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 123-127
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 discuss the effect of two types of high voltage electric field treatments on the storage quality of tomato fruit, ″Zhaoyan219″ tomato was taken as the experimental material, and the two treatments of the negative high voltage intermittent electrostatic field (namely steady electric field) that was 200 kV/m and 2 h/d and alternative electric field pretreatment (namely alternative electric field) that was -200~200 kV/m, 40 kHz and 2 h on the effect of qualities of mature green tomato fruit during the storage quality(13°C) were studied. The results indicate that the two treatments can lower the decay incidence (P < 0.05) remarkably. The decrease of firmness of tomato fruit, the content of soluble sugar and chlorophyll content of tomato peel and the increase of titratable acid and lycopene content are postponed by the effect of high voltage electric field treatments. That is how the infirmness is delayed and the qualities of tomato fruit are improved.
Number of references: 16
Main heading: Electric fields
Controlled terms: Chlorophyll - Electric field measurement - Electricity - Fruits - Porphyrins - Sugar (sucrose)
Uncontrolled terms: Alternative electric field - Chlorophyll contents - Electrostatic field - Experimental materials - High voltage - High voltage electric field - Lycopene content - Pre-Treatment - Soluble sugars - Steady electric field - Storage quality - Titratable acid - Tomato fruits
Classification code: 701.1 Electricity: Basic Concepts and Phenomena - 801.2 Biochemistry - 804.1 Organic Compounds - 821.4 Agricultural Products - 822.3 Food Products - 942.2 Electric Variables Measurements
DOI: 10.3969/j.issn.1000-1298.2010.07.026
Database: Compendex 32. Accession number: 20103213129060
Title: Research on high precision and fast generation algorithm of NC tool path for triangular mesh surface
Authors: Sun, Dianzhu1 ; Li, Xincheng1 ; Li, Yanrui1 ; Liu, Jian1
Author affiliation: 1 School of Mechanical Engineering, Shandong University of Technology, Zibo 255091, China
Corresponding author: Sun, D. (dianzhus@sdut.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 223-226
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract: A new high precision and fast generation algorithm of NC tool path for triangular mesh surface was proposed, which included four steps: the first, the topological structure of the triangular mesh surface was organized by improving the R*-tree spacial index structure; the second, triangular patches were obtained based on R*-tree spacial index structure and their geometric characteristics were analyzed; the third, parabola was adopted to approximate grid borders based on the first-order continuous; the fourth, the numerical control tool path was obtained through offsetting and sorting the cutter-contact points which were calculated by intersecting between the parabola and tool section. The experimental result proves that the algorithm data have strong adaptability with high precision numerical control tool path.
Number of references: 10
Main heading: Mesh generation
Controlled terms: Algorithms - Numerical control systems - Scanning
Uncontrolled terms: Contact points - Curve approximation - First-order - Generation algorithm - Geometric characteristics - High precision - Index structure - NC tool path - New high - Numerical control - Tool path generation - Topological structure - Triangular meshes - Triangular patch
Classification code: 723 Computer Software, Data Handling and Applications - 723.5 Computer Applications - 731.1 Control Systems - 741.3 Optical Devices and Systems - 921 Mathematics - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory
DOI: 10.3969/j.issn.1000-1298.2010.07.045
Database: Compendex 33. Accession number: 20103213129017
Title: Joint probability density function modeling of spray and turbulent reactive flow
Authors: He, Zhixia1 ; Wang, Qian1 ; Rybakov, Andriy2 ; Maas, Ulrich2
Author affiliation: 1 School of Energy Resources and Power Engineering, Jiangsu University, Zhenjiang 212013, China
2 Institute of Technical Thermodynamics, University of Karlsruhe, Karlsruhe 76128, Germany
Corresponding author: He, Z. (zxhe@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
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: Velocity-scalar-frequency joint probability density function (JPDF) transport equation method was introduced into the two-phase turbulent reactive flow coupled with flamelet method for solving the relation between flow field and chemical dynamics. Based on this model and the Monte-Carlo numerical solving method, the numerical simulation was performed for the turbulent spray combustion in a piloted jet flame burner developed by Masri. The comparison between the experiment and the numerical simulation results verified the spray JPDF model.
Number of references: 8
Main heading: Probability density function
Controlled terms: Combustion - Computer simulation - Flammability - Mathematical models - Number theory - Probability
Uncontrolled terms: Chemical dynamics - Flamelet models - Flamelets - Jet flames - Joint probability density function - MONTE CARLO - Numerical simulation - Reactive flow - Solving method - Transport equation - Turbulent combustion - Turbulent spray
Classification code: 521.1 Fuel Combustion - 521.4 Flame Research - 723.5 Computer Applications - 914.2 Fires and Fire Protection - 921 Mathematics - 922.1 Probability Theory
DOI: 10.3969/j.issn.1000-1298.2010.07.002
Database: Compendex 34. Accession number: 20103213129047
Title: Navigation system for preventing pests and diseases using agricultural aircraft
Authors: Xiong, Yingjun1 ; Shen, Mingxia1 ; Zhang, Xiangfu1 ; Zhou, Liang1 ; Ma, Fengxian1
Author affiliation: 1 College of Engineering, Nanjing Agricultural University, Nanjing 210031, 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: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 153-156 146
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 GPS technology and the embedded system, a multifunctional agricultural aircraft navigation system was designed. It combined the functions of automatic depiction of the farm outline, automatic trace planning, farm area calculation, real time trace-display and voice prompts. System hardware platform and QT environment were introduced, and the system function algorithm was discussed. The least square method was used to predict the positioning data in high-speed environments, it effectively reduced the positioning delay generated by the high-speed motion. Designing functions were achieved with the navigation system in certain field.
Number of references: 5
Main heading: Global positioning system
Controlled terms: Air navigation - Aircraft - Embedded systems - Least squares approximations - Navigation systems
Uncontrolled terms: Agricultural aircraft - Area calculation - GPS technologies - High-speed - High-speed motion - Least square methods - Positioning data - Real time - System functions - System hardware
Classification code: 943.3 Special Purpose Instruments - 921.6 Numerical Methods - 723 Computer Software, Data Handling and Applications - 722 Computer Systems and Equipment - 716.3 Radio Systems and Equipment - 655.2.1 Communication Satellites - 652.1 Aircraft, General - 434.4 Waterway Navigation - 431.5 Air Navigation and Traffic Control
DOI: 10.3969/j.issn.1000-1298.2010.07.032
Database: Compendex 35. Accession number: 20103213129024
Title: Influence of interstage leakage on the axial force of the multistage centrifugal pump
Authors: Mou, Jiegang1 ; Li, Si1 ; Zheng, Shuihua1 ; Jin, Jianbo1 ; Su, Miaoyin1 ; Zhao, Yongpan1
Author affiliation: 1 College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, 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: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 40-44
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract: The influence of interstage leakage among impellers to the flow state outside the front and back shrouds of the multistage centrifugal pump was studied. The velocity distribution of inner flow and the value of axial force were measured by the experimental device of centrifugal pump. The results indicated that the rotation velocity of the liquid outside the front shroud was 0.5 times larger than the angular velocity of impellers, and the velocity outside the back shroud was 0.5 times less than the angular velocity. The pressure outside the front shroud was lower than the value outside the back shroud. The actual value of axial force was lower than the calculated. And the formula of the axial force should be modified.
Number of references: 15
Main heading: Pumps
Controlled terms: Angular velocity - Axial flow - Blowers - Centrifugal pumps - Hydraulic machinery - Impellers - Pumping plants - Velocity distribution
Uncontrolled terms: Axial force - Axial forces - Flow state - Inner flow - Multistage centrifugal pumps - Rotation velocity
Classification code: 943.2 Mechanical Variables Measurements - 931.3 Atomic and Molecular Physics - 931.1 Mechanics - 922.2 Mathematical Statistics - 632.2 Hydraulic Equipment and Machinery - 631.1 Fluid Flow, General - 618.3 Blowers and Fans - 618.2 Pumps - 601.2 Machine Components - 446 Waterworks - 402.1 Industrial and Agricultural Buildings
DOI: 10.3969/j.issn.1000-1298.2010.07.009
Database: Compendex 36. Accession number: 20103213129023
Title: Non-overload designing research on low specific speed submersible pump
Authors: Shi, Weidong1 ; Sun, Xinqing1 ; Lu, Weigang1 ; Liu, Qiang2 ; Dong, Guoqing2
Author affiliation: 1 Technical and Research Center of Fluid Machinery Engineering, Jiangsu University, Zhenjiang 212013, China
2 Jining Antai Mine Equipment Manufacturing Co., Ltd., Jining 272300, 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: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 36-39
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 design of low specific speed submersible pump, the influence of impeller structure parameters on shaft power of pump was analyzed. Under the condition of the maximum value of shaft power being no more than the input power of matching electromotor, the method of reducing the maximum value of pump was further researched in order to reduce the power of the matching electromotor. Then the design discriminated formula of the structure parameters of impeller was presented. The value of shaft power was predicted by the Fluent software. The results indicated that the ratio of maximum power of pump to the power in designing condition was less than 1.2 when the presented discriminated formula was used in design. The results of the experimentation of prototype showed that every parameter met the rating requirements; the maximum value of shaft power of pump was reduced greatly. The results demonstrated the guiding role of the discriminated formula in practice.
Number of references: 7
Main heading: Experiments
Controlled terms: Computer simulation - Design - Speed - Submersible pumps - Submersibles
Uncontrolled terms: FLUENT software - Input power - Low specific speed - Maximum power - Maximum values - Non-overload - Numerical simulation - Shaft power - Structure parameter
Classification code: 931.1 Mechanics - 902.1 Engineering Graphics - 901.3 Engineering Research - 723.5 Computer Applications - 674.1 Small Marine Craft - 618.2 Pumps - 408 Structural Design
DOI: 10.3969/j.issn.1000-1298.2010.07.008
Database: Compendex 37. Accession number: 20103213129030
Title: Infiltration characteristic contrast analysis of fresh water and saline water
Authors: Bi, Yuanjie1 ; Wang, Quanjiu1 ; Xue, Jing1
Author affiliation: 1 Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an 710048, China
Corresponding author: Wang, Q. (wquanjiu@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 70-75
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract: In order to research the difference between continuous infiltration and intermittent infiltration of fresh water and saline water, one-dimensional infiltration experiments of continuous and intermittent water with salinity of 1.33 g/L for fresh water and 3 g/L for saline were carried out in clay soil. The results showed that saline water can influence soil structural characteristics and enhance infiltration capacity. One dimensional infiltration modeling analysis showed that the model is able to describe the process of saline water infiltration exactly. Intermittent infiltration of fresh water had an effect of reducing infiltration, however, intermission infiltration of saline water had an effect of increasing infiltration. There existed slight difference in infiltration-reducing and infiltration-increasing effect for various circulation rate of intermission infiltration.
Number of references: 16
Main heading: Saline water
Controlled terms: Clay - Seepage - Soil mechanics
Uncontrolled terms: Circulation rates - Clay soil - Continuous infiltration - Fresh water - Increasing effect - Infiltration capacity - Infiltration characteristic - Infiltration modeling - Intermittent infiltration - Structural characteristics
Classification code: 407 Maritime and Port Structures; Rivers and Other Waterways - 414.2 Brick Materials - 441 Dams and Reservoirs; Hydro Development - 444 Water Resources - 483.1 Soils and Soil Mechanics - 812.1 Ceramics
DOI: 10.3969/j.issn.1000-1298.2010.07.015
Database: Compendex 38. Accession number: 20103213129019
Title: Steering neural network PID control for tracked vehicle with hydrostatic drive
Authors: Yang, Lei1 ; Ma, Biao1 ; Li, Heyan1
Author affiliation: 1 School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Corresponding author: Yang, L. (yangleisnr@gmail.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
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: Based on steering kinematics and dynamics analysis of tracked vehicle, steering control strategy was presented to realize reducing average vehicle speed automatically while achieving the driver's expected steering radius exactly in the case of not exceeding the system pressure threshold and secure steering. The steering controller was comprised of neural network PID controller and pump & motor displacement controller. The steering neural network control simulation was conducted by using Simulink of Matlab. The simulation results indicated that compared with conventional PID control, neural network control export overshoot reduced from 10.5% to 4.1% and control response time decreased from 4.8 s to 2.2 s, which meant that system real-time ability and robustness were improved. The simulation results for various steering conditions demonstrated that good steering stability and maneuverability were obtained with neural network control for tracked vehicle with hydrostatic drive.
Number of references: 10
Main heading: Neural networks
Controlled terms: Automobile parts and equipment - Automobile steering equipment - Computer simulation - Controllers - Fuzzy control - Hydraulics - Hydrodynamics - Maneuverability - Proportional control systems - Steering - Three term control systems - Tracked vehicles - Two term control systems
Uncontrolled terms: Control response - Hydrostatic drives - Kinematics and dynamics - Motor displacements - Neural network control - Neural network PID - Neural network PID controller - PID control - Simulation result - Simulink - Steering control - Steering controllers - Steering radius - System pressure - Vehicle speed
Classification code: 671.2 Ship Equipment - 723.4 Artificial Intelligence - 723.5 Computer Applications - 671.1 Ship Design - 731 Automatic Control Principles and Applications - 732.1 Control Equipment - 921 Mathematics - 731.1 Control Systems - 663.2 Heavy Duty Motor Vehicle Components - 631.1.1 Liquid Dynamics - 631.2 Hydrodynamics - 632.1 Hydraulics - 461.1 Biomedical Engineering - 652.1 Aircraft, General - 662.4 Automobile and Smaller Vehicle Components - 663 Buses, Tractors and Trucks - 655.1 Spacecraft, General
DOI: 10.3969/j.issn.1000-1298.2010.07.004
Database: Compendex 39. Accession number: 20103213129028
Title: Spatial variability of soil water content on a cropland-grassland mixed slope land in the Loess Plateau, China
Authors: She, Dongli1, 2 ; Shao, Ming'an2 ; Yu, Shuang'en1
Author affiliation: 1 Key Lab. of Efficient Irrigation-Drainage and Agricultural Soil-Water Environ. in Southern China, Ministry of Education, Hohai University, Nanjing 210098, China
2 State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Research Center of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences and Ministry of Education, Yangling, Shaanxi 712100, China
Corresponding author: Shao, M. (mashao@ms.iswc.ac.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 57-63
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 land use structure on the spatial variation characteristics of soil water content were studied based on the survey of soil water condition on a cropland-grassland mixed slope land in the Loess Plateau. The results showed that the soil water content presented a moderate spatial variability on the slope scale. The cropland-grassland mixed land use structures significantly increased the spatial variability of soil water contents. The soil water content had obvious spatial structure. The Gaussian model and Spherical model were the best fitting descriptors for the mean soil water content of 0~60 cm soil depth under arid and moist condition respectively. Compared to the moist condition, the mean soil water content had a higher sill and range, but a lower nugget-to-sill ratio under dry condition. The interpolation map by Kriging method showed that soil water content presented a significant different plaque distribution pattern, which was consistent with the mixed land use structure on the slope. The difference in the spatial variability and distribution pattern of soil water content (0~60 cm) in the test area mainly were effected by topography, precipitation, land use and land use structure.
Number of references: 5
Main heading: Water content
Controlled terms: Geologic models - Land use - Soil moisture - Underwater soils
Uncontrolled terms: Descriptors - Distribution patterns - Dry condition - Gaussian model - Kriging methods - Loess Plateau - Moist conditions - Plaque distribution - Soil depth - Soil water - Soil water content - Spatial structure - Spatial variability - Spatial variations - Spherical models
Classification code: 403 Urban and Regional Planning and Development - 442.2 Land Reclamation - 444 Water Resources - 471.1 Oceanography, General - 481.1 Geology - 483.1 Soils and Soil Mechanics
DOI: 10.3969/j.issn.1000-1298.2010.07.013
Database: Compendex 40. Accession number: 20103213129016
Title: Effect of hydrogen enrichment on the performance of a lean-burn gasoline engine at idle
Authors: Wang, Shuofeng1 ; Ji, Changwei1 ; Zhang, Bo1 ; Zhang, Minyue1 ; Luo, Jianbin1 ; 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: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 1-5 14
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 high cyclic variation and HC emissions of the lean-burn gasoline engine at idle conditions, an experimental investigation was carried out on a gasoline engine equipped with an electrical controlled hydrogen injection system. The hydrogen volume fraction in the total intake of 3% was adopted through adjusting hydrogen injection duration to study the effect of hydrogen enrichment on combustion and emission characteristics of a lean-burn gasoline engine at idle. The test results demonstrated that the indicated thermal efficiency was improved; flame development period and rapid burning duration were shortened after hydrogen enrichment. When the excess air ratio was 1.3, the coefficient of variation in indicated mean effective pressure was dropped from 33.9% of the original engine to 13.7% of the 3% hydrogen-enriched engine. Under idle and lean conditions, the addition of hydrogen was effective on improving HC, CO and NOx emissions performance of the SI engine.
Number of references: 14
Main heading: Hydrogen engines
Controlled terms: Combustion - Engines - Fuel injection - Gasoline - Hydrogen
Uncontrolled terms: CO and NO - Coefficient of variation - Combustion emissions - Cyclic variations - Effect of hydrogen - Emission characteristics - Emissions - Emissions performance - Excess air ratios - Experimental investigations - Flame development - Gasoline engines - HC emissions - Hydrogen enrichment - Hydrogen injection - Hydrogen volume fraction - Idle condition - Indicated mean effective pressure - Indicated thermal efficiency - Lean combustion - Lean condition - SI Engines - Test results
Classification code: 654.2 Rocket Engines - 617.3 Steam Engines - 612.3 Gas Turbines and Engines - 804 Chemical Products Generally - 612 Engines - 521.1 Fuel Combustion - 521 Fuel Combustion and Flame Research - 523 Liquid Fuels
DOI: 10.3969/j.issn.1000-1298.2010.07.001
Database: Compendex 41. Accession number: 20103213129018
Title: Investigations into multiple-injection fuel quantity fluctuation for high pressure common rail system with piezo-actuated injector
Authors: Ding, Xiaoliang1 ; Zhang, Youtong1 ; Xiong, Qinghui1
Author affiliation: 1 School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Corresponding author: Ding, X. (dingxiaoliang@bit.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 11-14
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract: The research on factors affecting injection quantity fluctuation for main injection was performed. The experiment was conducted by measuring the fuel quantity and flow rate for pilot and main injection with EFS IFR8420. The factors influencing were given as follows: main injection quantity fluctuated remarkably with short dwell time and small pilot injection quantity, with increasing dwell time between pilot and main injection, main injection quantity fluctuated periodically and the fluctuation range attenuated gradually. It is concluded that the injection quantity fluctuation is caused by the fluctuation of rail pressure generated by the pilot injection.
Number of references: 7
Main heading: Diesel engines
Controlled terms: Fuels - Jet pumps
Uncontrolled terms: Dwell time - Fuel quantity - High pressure common rail - High pressure common rail system - Injection quantity - Multiple injections - Pilot injection - Rail pressures - Short dwell time
Classification code: 522 Gas Fuels - 523 Liquid Fuels - 524 Solid Fuels - 612.2 Diesel Engines - 618.2 Pumps
DOI: 10.3969/j.issn.1000-1298.2010.07.003
Database: Compendex 42. Accession number: 20103213129042
Title: Effect of natamycin on quality and free polyamines of postharvest asparagus
Authors: Wei, Yunxiao1 ; Liu, Zhenfeng1 ; Ye, Xingqian1 ; Ma, Liliang2 ; Zhou, Yuxiang2
Author affiliation: 1 School of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310029, China
2 Zhejiang Xinchang Star Industrial Co., Ltd., Shaoxing 312500, China
Corresponding author: Ye, X. (psu@zju.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 128-131 44
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract: In order to determine the impacts of natamycin on postharvest asparagus, respiratory rate, color, shear force, weight loss, free polyamines, bacterial and mold count were examined under low temperature. The results indicate that the natamycin treatments reduce respiratory rates of asparagus, inhibite the increases of weight loss and putrescine content, and cut down the total molds of 1~3 orders of magnitude effectively. The peaks of spermine and spermidine appear earlier in natamycin treatments and their contents are increased. Moreover, the asparagus with natamycin has better appearance and texture.
Number of references: 9
Main heading: Amines
Controlled terms: Molds
Uncontrolled terms: Low temperatures - Orders of magnitude - Polyamines - Postharvest - Respiratory rate - Shear force - Spermidine - Weight loss
Classification code: 535.2.1 Metal Forming Machines - 804.1 Organic Compounds - 812.3 Glass - 816.2 Plants and Machinery for Plastics and Other Polymers - 818.4 Rubber Factories and Machinery
DOI: 10.3969/j.issn.1000-1298.2010.07.027
Database: Compendex 43. Accession number: 20103213129022
Title: Centrifugal pump impeller design by using direct inverse problem iteration
Authors: Tan, Lei1 ; Cao, Shuliang1 ; Gui, Shaobo1 ; Zhu, Baoshan1
Author affiliation: 1 State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
Corresponding author: Cao, S. (caoshl@mail.tsinghua.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 30-35 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: Based on the continuity and motion equations of fluid, the velocity potential functional equation of the S1 stream surface and the velocity gradient equation of the S2 stream surface were established. The flow field of the direct problem was solved by calculating the two families of stream surfaces. Based on the flow field of the direct problem, the inverse problem of centrifugal pump in drawing blade shape by point-by-point integration, thickening blade and smoothing leading edge of the blade by conformal mapping was accomplished. By using the flow field of the direct problem calculated by the impeller of the inverse problem to design the impeller, and using the impeller of the inverse problem designed by the flow field of the direct problem to calculate the flow, the final impeller was designed when the direct and inverse problems was converged. This method which applies the meridional velocity of direct problem result to inverse problem, can make up the deficiency of traditional design method by using one-dimensional flow assumption. The final impeller can distribute load equally with the characters of high efficiency and excellent cavitation performance. This method can increase the efficiency of design work and the accuracy of calculating results. The data of the blade's surface is complete which is convenient for blade manufacturing by numerical control machine.
Number of references: 5
Main heading: Inverse problems
Controlled terms: Centrifugal pumps - Conformal mapping - Design - Equations of motion - Flow fields - Hydraulic machinery - Hydraulics - Pumping plants - Pumps
Uncontrolled terms: Blade shapes - Cavitation performance - Centrifugal pump impellers - Design method - Design work - Flow computations - Functional equation - High efficiency - Leading edge - Motion equations - Numerical control - Onedimensional flow - Stream surface - Velocity gradients - Velocity potentials
Classification code: 931.1 Mechanics - 921.2 Calculus - 921 Mathematics - 902.1 Engineering Graphics - 632.2 Hydraulic Equipment and Machinery - 632.1 Hydraulics - 631.1 Fluid Flow, General - 618.2 Pumps - 446 Waterworks - 408 Structural Design - 402.1 Industrial and Agricultural Buildings
DOI: 10.3969/j.issn.1000-1298.2010.07.007
Database: Compendex 44. Accession number: 20103213129053
Title: Event-driven scheduler in monitoring and controlling system for greenhouse based on wireless sensor networks
Authors: Han, Antai1 ; Guo, Xiaohua2 ; Sun, Yanwei1
Author affiliation: 1 Institute of Electrical Engineering and Electronic Technology, China Jiliang University, Hangzhou 310018, China
2 Fair Friend Institute of Electromechanics, Hangzhou Vocational and Technical College, Hangzhou 310018, China
Corresponding author: Han, A. (antai.han@139.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 186-190 204
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 reduce the adverse impact of network time-varying delay, packet loss, network congestion, jitter and other properties on performance of the monitoring and controlling system for greenhouse environment based on wireless sensor networks, the event-driven feedback scheduling strategy was proposed. The basic idea of the proposed event-driven feedback scheduling strategy was to use deadline miss ratio as the indicator for the network quality of service, adjust the sampling period of each sensor nodes by means of feedback control technology at run time such that the bandwidth requirement of each sensor nodes could adapt the change of the network workload, and the quality of network service could be maintained at a certain level. The novel event-driven invocation mechanism for the feedback scheduler was adopted to reduce the design difficulty and overhead of the feedback scheduler. Experiments indicated the proposed event-driven feedback scheduling strategy was with rationality, effectiveness and practicability.
Number of references: 19
Main heading: Wireless sensor networks
Controlled terms: Ad hoc networks - Feedback control - Greenhouses - Jitter - Machine design - Monitoring - Quality of service - Scheduling - Sensor networks - Sensor nodes - Steel bridges - Telecommunication equipment - Time varying control systems - Time varying networks
Uncontrolled terms: Bandwidth requirement - Basic idea - Deadline miss ratio - Event driven - Event-driven scheduler - Feedback schedulers - Feedback-scheduling - Greenhouse environment - Monitoring and controlling System - Network congestions - Network quality of services - Network services - Runtimes - Sampling period - Time-varying delay
Classification code: 723 Computer Software, Data Handling and Applications - 731.1 Control Systems - 732 Control Devices - 821.6 Farm Buildings and Other Structures - 722.4 Digital Computers and Systems - 912.2 Management - 942 Electric and Electronic Measuring Instruments - 943 Mechanical and Miscellaneous Measuring Instruments - 944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 941 Acoustical and Optical Measuring Instruments - 722.3 Data Communication, Equipment and Techniques - 402.1 Industrial and Agricultural Buildings - 545.3 Steel - 601 Mechanical Design - 703.1 Electric Networks - 401.1 Bridges - 716 Telecommunication; Radar, Radio and Television - 717 Optical Communication - 718 Telephone Systems and Related Technologies; Line Communications - 722 Computer Systems and Equipment - 716.3 Radio Systems and Equipment
DOI: 10.3969/j.issn.1000-1298.2010.07.038
Database: Compendex 45. Accession number: 20103213129038
Title: Experiment on hybrid solar drying system assisted by heat pump for grain in-store drying
Authors: Li, Haifeng1 ; Li, Yong1 ; Dai, Yanjun1 ; Gao, Sufen2 ; Wei, Lei3 ; Li, Zongliang4
Author affiliation: 1 Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China
2 China Grain Reserves Corporation, Beijing 100044, China
3 Henan Weilai Machines Engineering Co., Ltd., Zhengzhou 450001, China
4 State Grain Reserves Kunming Depot, Kunming 650100, China
Corresponding author: Li, Y. (liyo@sjtu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 7
Issue date: July 2010
Publication year: 2010
Pages: 109-113
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 hybrid solar drying system assisted by heat pump for grain in-store drying was developed. The system is composed of solar air collector, heat pump and stir machine for grain. The experimental study was conducted for maize drying. The results indicated that average thermal efficiency of the air collector is up to 63% and COP of the heat pump can reach 5.4. The combined system can supply adequate and stable thermal energy. The effect of drying is obvious. Drying time is reduced and energy consumption is low. Besides, the uniformity of moist content is improved. Utilized for maize in-store drying, the system can reduce the moisture content of maize in the granary with the characteristics of safety, energy saving and better effect.
Number of references: 8
Main heading: Curing
Controlled terms: Drying - Experiments - Heat pump systems - Pumps - Solar dryers - Solar energy - Solar radiation
Uncontrolled terms: Combined system - Drying time - Energy consumption - Energy saving - Experimental studies - Heat pump - Heat pumps - In-store drying - Moisture contents - Solar air collector - Solar drying systems - Thermal efficiency
Classification code: 818.3 Rubber and Elastomer Processing - 815.1 Polymeric Materials - 802.3 Chemical Operations - 802.2 Chemical Reactions - 802.1 Chemical Plants and Equipment - 901.3 Engineering Research - 657.1 Solar Energy and Phenomena - 641.2 Heat Transfer - 618.2 Pumps - 616.1 Heat Exchange Equipment and Components - 615.2 Solar Power - 642.1 Process Heating
DOI: 10.3969/j.issn.1000-1298.2010.07.023
Database: Compendex
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