2012年11月第28卷第22期

2012年11月第28卷第22期

<RECORD 1>

Accession number:20125115818535
Title:Spatial simulation of soil total potassium in regional scale for Loess Plateau Region
Authors:Liu, Zhipeng (1); Shao, Ming'an (2); Wang, Yunqiang (2)
Author affiliation:(1) State Key Laboratory of Soil Erosion and Dry-Land Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China; (2) Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; (3) University of Chinese Academy of Sciences, Beijing 100049, China
Corresponding author:Shao, M.(shaoma@igsnrr.ac.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:132-140
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:To understand the spatial heterogeneity of soil total potassium in regional scale for Loess Plateau Region and its influencing factors, In the study, a total of 283 sampling sites were investigated in order to estimate the spatial variation of soil total potassium (STK) across the entire Loess Plateau (620, 000 km2). Spatial simulation and classical linear regression were used to quantify the relationships between STK and bulk density, clay and silt content, soil pH, precipitation, temperature, and elevation. The best state-space models explained more than 97% of the STK variation, while the best linear regression model explained less than 26% of the STK variation. The results showed that all the state-space models described the spatial variation of STK much better than that of the corresponding linear regression models. Spatial simulation is recommended as a useful tool for quantifying spatial relationships between soil properties and the other environmental factors in large-scale regions.
Number of references:31
Main heading:Linear regression
Controlled terms:Landforms - Potassium - Soils
Uncontrolled terms:Bulk density - Environmental factors - Large-scale - Linear regression models - Loess Plateau - Regional scale - Sampling site - Silt contents - Soil pH - Soil property - Spatial heterogeneity - Spatial relationships - Spatial simulation - Spatial variations - State-space modeling - State-space models
Classification code:481.1 Geology - 483.1 Soils and Soil Mechanics - 549.1 Alkali Metals - 922.2 Mathematical Statistics
DOI:10.3969/j.issn.1002-6819.2012.22.020
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 2>

Accession number:20125115818533
Title:Three-dimensional reconstruction of soil pore structure and prediction of soil hydraulic properties based on CT images
Authors:Cheng, Ya'nan (1); Liu, Jianli (1); Lü, Fei (1); Zhang, Jiabao (1)
Author affiliation:(1) Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; (2) University of Chinese Academy of Sciences, Beijing 100049, China
Corresponding author:Liu, J.(jlliu@issas.ac.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:115-122
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to better understand the effects of soil pore structure on water movement, the three-dimensional structure of soil pore was constructed using CT images of fluvor-aquic soil in Huang-Huai-Hai Plain. Pore size distribution and connectivity parameters were determined by digital image analysis. A spatially-correlated network model was set up to describe the effects of pore-scale structure on water flow in soils, and predict the hydraulic properties of soil samples. The results showed that the predicted hydraulic properties agreed well with the measured values and the correlation coefficients were above 0.94. It indicated that correlated network model could simulate pore-scale water movement process, which provides reference for predicting the unsaturated hydraulic properties of soil.
Number of references:26
Main heading:Three dimensional
Controlled terms:Computerized tomography - Forecasting - Hydraulics - Nuclear magnetic resonance - Pore structure - Soils
Uncontrolled terms:Computed Tomography - Correlation coefficient - CT Image - Digital image analysis - Hydraulic properties - Network models - Soil hydraulic properties - Soil pores - Soil sample - Three-dimensional reconstruction - Three-dimensional structure - Unsaturated hydraulics - Water flows - Water movements
Classification code:931.2 Physical Properties of Gases, Liquids and Solids - 921 Mathematics - 902.1 Engineering Graphics - 801 Chemistry - 632.1 Hydraulics - 531 Metallurgy and Metallography - 483.1 Soils and Soil Mechanics
DOI:10.3969/j.issn.1002-6819.2012.22.018
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 3>

Accession number:20125115818541
Title:Comprehensive monitoring model for agricultural drought and its application based on spatial information
Authors:Li, Hailiang (1); Dai, Shengpei (1); Hu, Shenghong (2); Tian, Guanghui (3); Luo, Hongxia (1)
Author affiliation:(1) Key Laboratory of Practical Research on Tropical Crops Information Technology in Hainan, Institute of Scientific and Technical Information, Chinese Academy of Tropical Agricultural Sciences, Danzhou 571737, China; (2) Environment and Plant Protection Research Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou 571737, China; (3) Hainan Institute of Meteorological Sciences, Haikou 570203, China
Corresponding author:Li, H.(fondgis@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:181-188
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:To improve the accuracy of the agricultural drought monitoring, the comprehensive monitoring model coupled with the remote sensing data and meteorological data was used. This model was established based on the relationship between the standardization vegetation supply water index (VSWI<inf>S</inf>), the comprehensive precipitation index (CPI) and the synchronous soil moisture data measured in the study area. The VSWI<inf>S</inf> was suitable for monitoring drought at high density vegetation area, and the CPI was suitable for monitoring drought at tropical area. The root mean square error (RMSE) of the model was 4.65% and the relative root mean square error (RMSE<inf>r</inf>) was 19.28%. Furthermore, the model was used to evaluate the change of the agricultural drought in Hainan island from October 2004 to January 2005. The results indicated that the drought in the study area were significantly different. Overall, the drought in the west and north were more serious than that in the east and south of the island respectively, and the drought in the plain was more serious than that in the mountain area. In terms of the time changes, the drought approached maximum in early December 2004. Until late January 2005, the drought was still serious. The heavy drought area of paddy, upland and special woodland accounted for 59%, 61% and 20% respectively. Crop growing was constrained obviously by this drought. Compared with last year, the value of the accumulated normalized difference vegetation index (NDVI) was reduced by 6.34%, and yield of the natural rubber was reduced about 1.16×104t from October to December in 2004. The research provides a reference for monitoring agricultural drought.
Number of references:30
Main heading:Drought
Controlled terms:Agriculture - Mean square error - Meteorology - Monitoring - Remote sensing - Soil moisture - Vegetation
Uncontrolled terms:Agricultural drought - Hainan island - High density - Meteorological data - Monitoring models - Normalized difference vegetation index - Remote sensing data - Root mean square errors - Spatial informations - Study areas - Time change - Water index
Classification code:944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 943 Mechanical and Miscellaneous Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 941 Acoustical and Optical Measuring Instruments - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 731.1 Control Systems - 483.1 Soils and Soil Mechanics - 444 Water Resources - 443 Meteorology
DOI:10.3969/j.issn.1002-6819.2012.22.026
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 4>

Accession number:20125115818529
Title:Dynamics comparison of rain-fed spring maize growth and evapotranspiration in plastic mulching and un-mulching fields
Authors:Wang, Hanbo (1); Gong, Daozhi (1); Mei, Xurong (1); Hao, Weiping (1)
Author affiliation:(1) Key Laboratory of Dryland Agriculture of Ministry of Agriculture, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China; (2) State Key Laboratory of Hydro-Science and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China
Corresponding author:Gong, D.(gongdz@ieda.org.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:88-94
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Using soil moisture sensors, micro-lysimeters and eddy covariance systems, dynamics of soil moisture and evaporation, farmland evapotranspiration, and growth of rain-fed spring maize were monitored continuously in plastic mulching and un-mulching fields, and the changing regularities of soil evaporation and farmland evapotranspiration also were analyzed to explore the mechanism of plastic mulching enhancing maize yield and water use efficiency. Results suggested that, in comparison with un-mulching, plastic mulching treatment had seedling emergence rate of 99%, which was significantly higher than 80% of the former, in addition with the help of plastic mulching, each growth stage of spring maize emerged an average of 7 days in advance, meanwhile whole growth period shortened 11 days. The temperature and volumetric water content of plastic mulching soil surface layer increased by 4.9% and 19.5% respectively. Except the late growth stage, the leaf area index (LAI), plant height, aboveground and underground dry matter of plastic mulching treatment significantly were higher than un-mulching treatment, while a month after sowing by 110.2%, 13.5%, 42.9% and 12.7% respectively. Before jointing stage and from August to mature stage, the evapotranspiration of plastic mulching treatment is lower than non-mulching treatment by 6.8% and 0.4% respectively, and between June and August, the evapotranspiration of plastic mulching treatment is higher than the latter by 5.1%. Finally, the difference of average grain weight and biomass per plant in these two treatments is not significant; however, because plastic mulching improved the emergence rate significantly, the biomass and seed yield per unit area increased by 23.7% and 15.3% respectively. At the same time, the plastic mulching also markedly improved crop water use efficiency by 22.6% to 31.3 kg/(hm2&middotmm). It is thus clear that plastic mulching significantly reduced soil evaporation and evapotranspiration, retained soil water and heat to promote maize germination, advanced growth stages, increased daily transpiration and dry matter accumulation rate by higher increments during middle growth stage, and eventually significantly improved biomass and economic yield per unit area and crop water use efficiency.
Number of references:28
Main heading:Water supply
Controlled terms:Biomass - Crops - Dynamics - Ecology - Efficiency - Evaporation - Evapotranspiration - Farms - Moisture - Phase transitions - Rain - Soil moisture - Soils - Transpiration
Uncontrolled terms:Changing regularity - Crop water use - Dry matter accumulation - Dry matters - Eddy covariance - Eddy covariance systems - Grain weights - Growth period - Growth stages - Leaf Area Index - Maize yield - Per unit - Plant height - Plastic mulching - Reduced soils - Seed yield - Seedling emergence - Soil evaporations - Soil moisture sensors - Soil surface layers - Soil water - Spring maize - Volumetric water content - Water use efficiency
Classification code:931.1 Mechanics - 913.1 Production Engineering - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 802.3 Chemical Operations - 801.4 Physical Chemistry - 643 Space Heating, Ventilation and Air Conditioning - 483.1 Soils and Soil Mechanics - 454.3 Ecology and Ecosystems - 446.1 Water Supply Systems - 443.3 Precipitation - 443.1 Atmospheric Properties
DOI:10.3969/j.issn.1002-6819.2012.22.014
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 5>

Accession number:20125115818523
Title:Performance test and analysis of submersible axial flow pump based on CFD
Authors:Sha, Yi (1); Hou, Liyan (2)
Author affiliation:(1) School of Mechanical and Automotive Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China; (2) Yantai Moon Co. Ltd., Yantai 264000, China
Corresponding author:Sha, Y.(shayi01@sina.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:51-57
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to investigate the performance prediction of high rotating speed axial-flow pumps, a QY90-4.4-1.5 submersible axial flow pump with specific speed 550 were used in the study, and its particular impeller and guide vane were designed on the basis of arc method and streamline method. The performance of the pump was numerically predicated by CFD. Firstly, three-dimensional physical modeling and unmapped grid division were made by Pro/E and ICEM software, and then the internal flow fields were numerically calculated with standard k-Ε turbulence model, meanwhile the performances of the pump model were also diagnosed by comprehensive analysis. The results presented that the calculated data was in good accordance with the experimental data. Because of the simulation of backflow and secondary flow has not been developed completely, there was a certain error for pump Q-H, Q-P, Q-η curves when it deviates from the rated condition largely. By analyzing the pressure and relative velocity distribution of the blade surface on the optimal condition, the results showed that larger drop pressure gradient in the leading edge was developed because of the impact flow leaves, and wide low-pressure zone on the back of blade led to cavitation. Meanwhile, the speed was increased with the radius direction and no radial-branch velocity was developed. Overall, the results basically was according with the assumption of uniform distribution for velocity circulation with the radius in impeller.
Number of references:26
Main heading:Pumps
Controlled terms:Axial flow - Computational fluid dynamics - Flow fields - Impellers - Models - Submersibles - Three dimensional - Turbulence models
Uncontrolled terms:Arc method - Axial flow pump - Backflow - Blade Surface - Comprehensive analysis - Grid division - Guide vane - Impact flow - Internal flow field - Leading edge - Optimal conditions - Performance prediction - Performance tests - Physical modeling - Pump models - Radius direction - Rated condition - Rotating speed - Specific speed - Stream-line methods - Uniform distribution
Classification code:601.2 Machine Components - 618.2 Pumps - 631 Fluid Flow - 674.1 Small Marine Craft - 902.1 Engineering Graphics
DOI:10.3969/j.issn.1002-6819.2012.22.008
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 6>

Accession number:20125115818517
Title:Design and test on belt-type seed delivery of air-suction metering device
Authors:Chen, Xuegeng (1); Zhong, Luming (2)
Author affiliation:(1) Mechanical Equipment Research Institute, Xinjiang Academy of Agricultural and Reclamation Science, Shihezi 832000, China; (2) Electrical and Mechanical College, Shihezi University, Shihezi 832000, China
Corresponding author:Chen, X.(chenxg130@sina.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:8-15
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:According to the weakness of the high seed dropping position, the big variability of seed-spaces in soil and the low qualification rate of the double driving discs furrow opener of no-tillage planter, a new belt type seed delivery device was designed and developed. Based on the analysis of the cavitation time of suction seed metering device, the new belt-type seed device combined transmission and dropping seed institutions, which was related with the speed of seed metering device and the speed of planter. Also its main structural parameters were determined. Comprehensive impact factors affected the three test indicators differently, the primary and secondary order of influencing factors for seeding quality was determined, and the results showed that the order was the height of the throwing point, speed of the take seed plate and the suction pressure. The optimum parameter combination was that the height of the throwing point was 100 mm, the speed of the take seed plate was 30 r/min and the suction pressure was 3.5 kPa. At these conditions, particles away from a pass rate were 98.50%, the leakage sowing rate was 0.48% and replay rate was 1.02%. Through experimental verification, the error of experimental and theoretical results was 0.11%, 0.17% and 0.08%, which met the needs of the test requirements. The research provides a reference for further improving quality and optimizing the parameter for air-suction metering device.
Number of references:22
Main heading:Seed
Controlled terms:Agricultural machinery - Construction - Plates (structural components) - Speed
Uncontrolled terms:Delivery device - Design and tests - Experimental verification - Furrow openers - Height of seed dropping position - Impact factor - Metering devices - No-tillage planter - Optimum parameters - Pass rate - Seed metering devices - Structural parameter - Suction pressures - Test requirements - Theoretical result - Throwing point
Classification code:405 Construction Equipment and Methods; Surveying - 408.2 Structural Members and Shapes - 821.1 Agricultural Machinery and Equipment - 821.4 Agricultural Products - 931.1 Mechanics
DOI:10.3969/j.issn.1002-6819.2012.22.002
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 7>

Accession number:20125115818522
Title:Dynamic stability analysis on water lubricated bearing rotor system of high pressure multistage pump
Authors:Jiang, Xiaoping (1); Shi, Weidong (1); Li, Wei (1); Ye, Xiaoyan (1); Hu, Jingning (1); Tian, Haiping (1)
Author affiliation:(1) Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Jiang, X.(jxp2502@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:45-50
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:To analyze the startup and operation stability problems of high pressure multistage centrifugal pump water lubricated bearing-rotor system, analysis and judgment about the dynamic stability of water lubricated bearing-rotor system were performed on the aspects of critical speed, bearing dimensionless film composite stiffness, stability margin of logarithmic decay rate and the sudden unbalance response of excitation system. Physical and mathematical model were established to study the dynamic characteristics of the pump bearing-rotor system. The calculated first critical speed of the bearing-rotor system under rigid support and the modular elastic support was consistent with the stability condition. The values of dimensionless film integrated bearing stiffness, such as k<inf>eq</inf> and γ<inf>st</inf> were below zero, and the logarithmic decay rate of the first four modal analysis characteristic values at a rotational speed of 3000 r/min was greater than zero, which also demonstrate that the system was stable. This water lubricated bearing-rotor system was certified to be a stable system by responsive spectrum analysis on constant speed (500, 2500, 5000 and 10000 r/min), working speed (2950 r/min), and different starting acceleration suddenly adding exciting force. Therefore, this water lubricated bearing rotor system of high pressure multistage pump is a stable rigid system.
Number of references:21
Main heading:System stability
Controlled terms:Bearings (structural) - Centrifugal pumps - Decay (organic) - Lubrication - Mathematical models - Modal analysis - Pumps - Rigid rotors - Rotors - Spectrum analysis - Speed - Stability
Uncontrolled terms:Bearing stiffness - Bearing-rotor system - Characteristic value - Constant speed - Critical speed - Dynamic characteristics - Dynamic stability analysis - Elastic supports - Excitation system - Exciting forces - Film composites - High pressure - Logarithmic decay - Multistage centrifugal pumps - Multistage pumps - Operation stability - Rigid systems - Rotational speed - Stability condition - Stability margins - Stable systems - Unbalance response - Water lubricated bearings - Water lubrication - Working speed
Classification code:961 Systems Science - 951 Materials Science - 931.1 Mechanics - 931 Classical Physics; Quantum Theory; Relativity - 921 Mathematics - 801.2 Biochemistry - 801 Chemistry - 618.2 Pumps - 607.2 Lubrication - 601.2 Machine Components - 408.2 Structural Members and Shapes
DOI:10.3969/j.issn.1002-6819.2012.22.007
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 8>

Accession number:20125115818531
Title:Fertilizer performance evaluation for fertigation and conventional fertilization in basin irrigation with ammonium-sulphate application
Authors:Zhang, Shaohui (1); Xu, Di (1); Bai, Meijian (1); Li, Yinong (1)
Author affiliation:(1) Department of Irrigation and Drainage, China Institute of Water Resources and Hydropower Research, Beijing 100048, China; (2) National Center of Efficient Irrigation Engineering and Technology Research, Beijing 100048, China
Corresponding author:Zhang, S.(zhangsh@iwhr.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:103-107
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to analyze and compare the basin irrigation performance among different fertilization methods, ammonium-sulphate was selected as fertilizer to perform basin irrigation experiments with fertigation and conventional fertilization methods. Three kinds of indices for practical basin irrigation, such as nitrogen uniformity, nitrogen efficiency and nitrogen adequacy, were calculated. At the same time, the basin irrigation performance differences with fertigation and conventional fertilization were analyzed. The results showed that the nitrogen uniformity, efficiency and adequacy between fertigation and conventional fertilization had significant differences. The indices' values of fertigation were 14.5, 14.3 and 8.4 percentage point higher than the irrigation conventional fertilization, respectively. For local basin, the nitrogen uniformity between large (6 L/(m&middots)) and small (3 L/(m&middots)) discharge for fertigation had significant difference, and the former was 4.2 higher than latter, thus the former was more suitable than the latter. For the basin irrigation with conventional fertilization, the nitrogen uniformity, efficiency and adequacy between large and small discharge had significant difference. For global basin, the nitrogen uniformity of small discharge was 5.5 percentage point higher than the large discharge, and nitrogen efficiency and adequacy of small discharge were 5.3 and 3.2 higher than the large discharge, respectively. This research can provide the scientific basis for evaluation and optimization of basin irrigation system with fertilization.
Number of references:21
Main heading:Irrigation
Controlled terms:Ammonium compounds - Efficiency - Fertilizers - Nitrogen - Sulfur compounds
Uncontrolled terms:Deposited ratio - Fertigations - Flow - Satisfaction ratio - Sulphates - Uniformity
Classification code:804 Chemical Products Generally - 821.3 Agricultural Methods - 913.1 Production Engineering
DOI:10.3969/j.issn.1002-6819.2012.22.016
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 9>

Accession number:20125115818526
Title:Performance test of water-cooled low-temperature plasma reactor
Authors:Li, Kanghua (1); Cai, Yixi (1); Li, Xiaohua (1); Han, Wenhe (1); Wei, Xing (1); Jiang, Fei (1)
Author affiliation:(1) School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Li, K.(franklkh@126.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:69-75
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:To effectively control the surface temperatures of the discharge zone, a water-cooled non-thermal plasma reactor was designed, and he impacts of the operating voltage, frequency and air flow rate on the concentration of the active materials (O<inf>3</inf>, NO<inf>2</inf>) were investigated at different surface temperatures of the discharge zone. The chemical reaction mechanism was discussed. The results indicated that the discharge power was increased with the rising of V<inf>P-P</inf>, frequency and temperature, while the flow rate of air has little influence on it. The concentrations of O<inf>3</inf> and NO<inf>2</inf> were increased and then decreased as the air flow rate rising, with constant surface temperature of discharge zone. Reducing the surface temperature of the discharge zone can effectively improve the concentrations of O<inf>3</inf> and NO<inf>2</inf>. These results provide a reference for reducing the diesel engine exhaust and regenerating diesel particulate filter in the indirect non-thermal plasma system.
Number of references:30
Main heading:Nitrogen oxides
Controlled terms:Air - Atmospheric temperature - Diesel engines - Exhaust systems (engine) - Flow rate - Ozone - Plasma applications - Plasmas - Surface properties - Temperature
Uncontrolled terms:Active material - Air flow-rate - Constant surface temperatures - Dielectric barrier discharges - Diesel particulate filters - Discharge power - Discharge zone - Low temperature plasmas - Nitrogen dioxides - Non-thermal plasma reactors - Nonthermal plasma - Operating voltage - Performance tests - Reaction mechanism - Surface temperatures
Classification code:932.3 Plasma Physics - 804.2 Inorganic Compounds - 804 Chemical Products Generally - 951 Materials Science - 641.1 Thermodynamics - 612 Engines - 443.1 Atmospheric Properties - 631 Fluid Flow
DOI:10.3969/j.issn.1002-6819.2012.22.011
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 10>

Accession number:20125115818534
Title:Soil tillage practices coping with drought climate change in central region of Songliao Plain
Authors:Yin, Xiaogang (1); Liu, Wuren (2); Zheng, Hongbing (2); Zhang, Hailin (1); Chu, Qingquan (1); Wen, Xinya (1); Yin, Pengfei (1); Chen, Fu (1)
Author affiliation:(1) Key Laboratory of Farming System, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China; (2) Center for Agricultural Environment and Resources, Jilin Academy of Agricultural Sciences, Changchun 130124, China
Corresponding author:Chen, F.(chenfu@cau.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:123-131
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In recent 30 years, the influence of spring drought risk on maize production has been increased with the climate change in central Songliao Plain, Northeast China. In this paper, we collected 7 meteorological stations' daily climate data to analyze climate change trend from May to September. These meteorological stations included Changchun, Tonghe, Shangzhi, Fuyu, Kaiyuan, Shuangliao and Siping, which were typical areas of central Songliao Plain. Results showed rainfall in the region decreased during the maize growing season, however, the average temperature, maximum temperature and minimum temperature showed an increasing trend. Drought risks in the maize growing season were aggravated and the drought occurrence frequency increased greatly. In the past 10 years, the drought probability was 60%. On this basis, this paper analyzed the measures coping with climate change in this region from soil tillage effects. Soil moisture, compactness, permeability and maize yield were compared among the treatments of the no-tillage(NT), rotary tillage(RT), conventional tillage(CT) and wide-narrow row alternative tillage(DL). Conservation tillage technologies such as no tillage and wide-narrow alternative tillage with water benefits, which could alleviate drought risk in this region, will be adapted to climate change and become useful measures to improve the yield of maize.
Number of references:34
Main heading:Drought
Controlled terms:Agricultural machinery - Climate change - Cultivation - Meteorology - Risk assessment - Soil conservation - Soil moisture
Uncontrolled terms:Climate data - Conservation tillage - Conventional tillage - Maize - Maize growing season - Maize production - Maize yield - Maximum temperature - Meteorological station - No tillage - Northeast China - Soil tillage
Classification code:922.1 Probability Theory - 821.3 Agricultural Methods - 821.1 Agricultural Machinery and Equipment - 483.1 Soils and Soil Mechanics - 451 Air Pollution - 444 Water Resources - 443 Meteorology
DOI:10.3969/j.issn.1002-6819.2012.22.019
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 11>

Accession number:20125115818551
Title:Spatial distribution scale characteristics of rural settlements and analysis on influencing factors in Danyang city
Authors:Shen, Chenhua (1)
Author affiliation:(1) College of Geographical Science, Nanjing Normal University, Nanjing 210046, China
Corresponding author:Shen, C.(shenandchen01@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:261-268
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to accelerate land consolidation of rural residents, which is about to be implemented in Danyang city Jiangsu province, scale characteristics about the spatial distribution of rural settlements and transportation factor influence on distribution of rural settlements were analyzed by using the GIS spatial analysis method such as the Ripley's K function analysis based on the land survey use database about Danyang City in 2010. The results showed as follows: 1) In the township scale, the spatial pattern of rural settlements presented three kinds of patterns, such as uniformity, randomness, and cluster. However, in the village scale, it presented both the uniformity pattern and the cluster one. 2) The proportion of rural settlements on the both sides of the transportation lines, such as highways and rivers, country roads was 2-3 times of the average proportion of rural settlements. The distant coefficient of rural settlements on both sides of traffic lines was closely related to the distribution of rural settlements. In the smaller scale range, the effects of highways, rivers, and country roads on the spatial distribution of rural settlements were different. This research could provide an important reference for the smooth implement of the land arrangement of rural settlements.
Number of references:31
Main heading:Factor analysis
Controlled terms:Land use - Rural areas - Rural roads - Spatial distribution - Transportation
Uncontrolled terms:Country roads - Danyang city - Jiangsu province - Ripley's K function - Rural residents - Rural settlement - Spatial analysis - Spatial patterns - Traffic lines - Transportation factors - Transportation line
Classification code:921 Mathematics - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 434 Waterway Transportation - 922.2 Mathematical Statistics - 433 Railroad Transportation - 431 Air Transportation - 403 Urban and Regional Planning and Development - 432 Highway Transportation
DOI:10.3969/j.issn.1002-6819.2012.22.036
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 12>

Accession number:20125115818546
Title:Effects of heat preservation of water-cooled swine beds on small group raising of pregnant sows in winter
Authors:Li, Wei (1); Lin, Baozhong (2); Liu, Zuohua (2); Wang, Chaoyuan (1); Li, Baoming (1)
Author affiliation:(1) Key Laboratory of Agricultural Engineering in Structure and Environment, College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; (2) Institute of Animal Husbandry Engineering, Chongqing Academy of Animal Sciences, Chongqing 406420, China
Corresponding author:Li, B.(libm@cau.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:222-226
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to investigate practical effect of heat preservation of water-cooled swine bed with small groups raising of pregnant sows and low temperature in winter, sixteen pregnant sows for 4 weeks were used. Four pens were divided into experimental group and control group randomly, each pen was four sows. The door-curtain at two ends of swine bed was installed for heat preservation. The environmental temperatures for each group were measured and sows behavior was observed. The results showed that the temperatures in swine bed unit in the experimental group were 3.2 and 6.9°C higher than that of control group and indoor temperature, respectively. Two sows did not lied simultaneously in a unit when the indoor temperature was above 11°C in the experimental group and 12°C in control group. Compared the experimental group with the control group, there was significantly different (P<0.05) between the lying time (18.6 h, 17.8 h) and the drinking frequency (18.5, 23.3) every day. The frequency of biting chain (14.0, 19.0) was extreme different (P<0.01). The times of defecation and urination in unit account 1.8% and 12.1% of the total times in the experimental group, while it was 0 and 3.2% in control group. The results suggested that heat preservation by door-curtain of swine bed could improve the local temperature of lying area and reduce stereotypic behaviors for pregnant sows.
Number of references:23
Main heading:Behavioral research
Controlled terms:Animals - Atmospheric temperature - Heat problems - Space heating
Uncontrolled terms:Control groups - Environmental temperature - Experimental groups - Group housing - Heat preservation - In-control - Indoor temperature - Local temperature - Low temperatures - Lying area - Pregnant sows - Swine bed
Classification code:971 Social Sciences - 822 Food Technology - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 814 Leather and Tanning - 651.1 Aerodynamics, General - 643.1 Space Heating - 471 Marine Science and Oceanography - 461 Bioengineering and Biology - 443.1 Atmospheric Properties
DOI:10.3969/j.issn.1002-6819.2012.22.031
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 13>

Accession number:20125115818540
Title:Recognition and localization methods of occluded apples based on convex hull theory
Authors:Song, Huaibo (1); He, Dongjian (1); Pan, Jingpeng (1)
Author affiliation:(1) College of Mechanical and Electronic Engineering, Northwest Agricultural and Forest University, Yangling 712100, China
Corresponding author:He, D.(hdj87091197@yahoo.com.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:174-180
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Aimed to realize the recognition and localization of occluded apples by branches, leaves and overlapped apples, a method for recognizing occluded apples based on convex hull theory was presented. In the first step, the image was transformed from RGB color space to L*a*b* color space, and K-means clustering algorithm was used to segment the input image to three different categories including leaves, stems and apples. In the second step, mathematical morphology was carried out to get the contours of apples. In the third step, the convex hull of object boundary was used to extract the smooth and real contours. In the last step, the centers and radiuses of the extracted contours were estimated, which were used to localize the occluded apples. In order to validate the performance of the algorithm presented in this study, a comparative test was conducted using Circle Hough Transform (CHT), and the positioning errors were calculated. The experimental results showed that the average positioning error of the method presented in this study was 4.28%, while that of the CHT method was 16.30%. The method significantly improves the accuracy of target positioning and is feasible and effective to recognize occlude apples.
Number of references:26
Main heading:Fruits
Controlled terms:Clustering algorithms - Computational geometry - Hough transforms - Image recognition - Location - Mathematical morphology
Uncontrolled terms:Average positioning error - Circle Hough transforms - Color space - Comparative tests - Convex hull - Input image - K-Means clustering algorithm - Localization method - Object boundaries - Positioning error - RGB color space - Target positioning
Classification code:716 Telecommunication; Radar, Radio and Television - 721 Computer Circuits and Logic Elements - 821.4 Agricultural Products - 911 Cost and Value Engineering; Industrial Economics - 912 Industrial Engineering and Management - 921 Mathematics
DOI:10.3969/j.issn.1002-6819.2012.22.025
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 14>

Accession number:20125115818532
Title:Identification of potential rainwater harvesting sites using SCS-CN and GIS
Authors:Wang, Honglei (1); Wang, Xiuru (1); Wang, Xi (1); Jiang, Lijuan (2)
Author affiliation:(1) Key Laboratory of Soil and Water Conservation and Desertification Combating, College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China; (2) Beijing City Pinggu District Water Bureau, Beijing 101200, China
Corresponding author:Wang, X.(wang-xr@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:108-114
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Water shortage in mountainous areas is a prevailing problem in Northern China. In this study, the upstream of Qinghe River, a semiarid mountainous area in western Beijing, was investigated and relevant solutions were put forward. The Remote Sensing (Erdas imagine 9.1) and Geographic Information Systems (ArcGIS 10) software were adopted to process data about TM images, soil texture map and Digital Elevation Model (DEM). Soil Conservation Service curve number (SCS-CN) method was used to calculate runoff and establishe constraint site selection criteria based on rainwater harvesting technology and technical code. Afterwards, spatial query and proximity analysis on the spatial thematic data and runoff potential were carried out using the ArcGIS10. The site selection of potential rainwater harvesting projects was completed on the basis of the above-mentioned methods. The results showed that: The sites suitable for the construction of water storage pond was as follows: the area of 4.24 km2, 46 reservoirs, 50 water retaining dams, 53 open wells, and courtyard rainfall collection area 4.95 km2. The results provide a reference for the rational utilization of rainwater resources and projects construction.
Number of references:24
Main heading:Rain
Controlled terms:Digital storage - Geographic information systems - Hydrology - Infiltration - Models - Remote sensing - Reservoirs (water) - Runoff - Site selection - Water resources - Water supply
Uncontrolled terms:Digital elevation model - Mountainous area - Northern China - Process data - Rain water harvesting - SCS-CN method - Selection criteria - Soil conservation service curve numbers - Soil textures - Spatial queries - Suitable site - Thematic data - TM image - Water retaining - Water shortages - Water storage ponds
Classification code:731.1 Control Systems - 723.3 Database Systems - 722.1 Data Storage, Equipment and Techniques - 452.1 Sewage - 446.1 Water Supply Systems - 902.1 Engineering Graphics - 444.1 Surface Water - 443.3 Precipitation - 441.2 Reservoirs - 403 Urban and Regional Planning and Development - 402 Buildings and Towers - 444 Water Resources
DOI:10.3969/j.issn.1002-6819.2012.22.017
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 15>

Accession number:20125115818525
Title:Quantitative analysis of relationship between backlash value and distance of two relief grooves in external gear pump
Authors:Li, Yulong (1); Sun, Fuchun (1)
Author affiliation:(1) School of Industrial Manufacturing, Chengdu University, Chengdu 610106, China
Corresponding author:Li, Y.(leo-world@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:63-68
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:For meeting higher volumetric efficiency and minimizing pressure of trapped oil in external gear pump, the topic that whether the minimum distance between two relief grooves in small backlash could be applied in a large backlash or couldn't be proposed. Based on only considering two main leakages produced from the gap between backlash gap and relieving grooves, through trapped oil model created and verified in the early literature, two main leakages and it's volumetric ratios were calculated by simulation, and the curves of two volumetric ratios were respectively generated with different backlash values or speeds or output pressures. All the results indicated that the determination of no backlash or a backlash in external gear pump was meaningless. The volumetric efficiency was decreased with the increasing of the backlash value and output pressure. The trapped-oil phenomenon was more seriou with higher rotate speed and volumetric efficiency. The minimum distance between two relieving grooves in no backlash made trapped-oil phenomenon to be greatly improved, and the improvement made the volumetric efficiency higher. Finally, the minimum distance between the two relieving grooves in a small backlash can be applied in a large backlash, which provides a new reference in layout of relieving grooves for external gear pump.
Number of references:23
Main heading:Gear pumps
Controlled terms:Computer simulation - Efficiency - Models
Uncontrolled terms:Backlash - External gear pumps - Minimum distance - Relief groove - Rotate speed - Trapped oil - Volumetric efficiency - Volumetric ratio
Classification code:618.2 Pumps - 723.5 Computer Applications - 902.1 Engineering Graphics - 913.1 Production Engineering
DOI:10.3969/j.issn.1002-6819.2012.22.010
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 16>

Accession number:20125115818519
Title:Development and test of tiny remotely controlled electric tractor for greenhouses
Authors:Wang, Yuanjie (1); Liu, Yongcheng (1); Yang, Fuzeng (1); Lu, Yi (1); Lan, Yubin (2); Chen, Zhi (3)
Author affiliation:(1) College of Mechanical and Electronic Engineering, Northwest Agricultural and Forest University, Yangling 712100, China; (2) College of Agricultural Engineering, Texas Agricultural and Mechanical University, Texas 77845, United States; (3) China National Machinery Industry Corporation, Beijing 100080, China
Corresponding author:Yang, F.(yfz0701@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:23-29
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:To solve the problems of serious pollutions, going along with the machine, inconvenient operations and high operating costs etc, a tiny remotely controlled electric tractor was designed. Its overall performances were tested in plowing condition for greenhouse. The results showed that the tractor exhibited good turning maneuver performance with the minimum turning radius of 418 mm, which can be used in greenhouses under the relatively narrow operating environment. Traveling rectilinear was preferable with the yawing rate of 0.86%. Parallelogram mechanism and shovel in conjunction with single ploughshare turnover plow effectively solved the problem of partial traction. The operating efficiency was 720 m2/h, continuous operation time was 2.5 h. The operating energy costs were approximately 14.4 yuan/hm2, which were 89.2% and 79.3% to 88.7% lower than those of Lantian 1DN-4 micro-farming machine and Hesheng 1Z-105 micro-cultivator, respectively. The results suggested that this machine had more significant economic benefits and was suitable for the operational requirements of the special environment of greenhouses and sheds.
Number of references:28
Main heading:Automobile testing
Controlled terms:Agricultural machinery - Electricity - Greenhouses - Mechanisms - Tractors (agricultural) - Tractors (truck)
Uncontrolled terms:Continuous operation - Economic benefits - Electric tractors - Energy cost - Operating efficiency - Operating environment - Operational requirements - Parallelogram mechanisms - Remote controlled - Test - Turning maneuvers - Turning radius
Classification code:821.6 Farm Buildings and Other Structures - 821.1 Agricultural Machinery and Equipment - 701.1 Electricity: Basic Concepts and Phenomena - 663.1 Heavy Duty Motor Vehicles - 663 Buses, Tractors and Trucks - 662 Automobiles and Smaller Vehicles - 601.3 Mechanisms
DOI:10.3969/j.issn.1002-6819.2012.22.004
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 17>

Accession number:20125115818550
Title:Quantitative effects of climate variations and land-use changes on annual streamflow in Chaobai river basin
Authors:Zhao, Yang (1); Yu, Xinxiao (1); Zheng, Jiangkun (2); Wu, Qiaoying (1)
Author affiliation:(1) School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China; (2) Forestry College, Sichuan Agricultural University, Ya'an 625014, China
Corresponding author:Yu, X.
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:252-260
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to make the quantitative analysis of the impacts of climate variation and land use change on annual streamflow, Chaobai River watershed located in rocky mountain area of north China was selected as research object. AWY model and separation evaluation method were applied to quantify the respective contribution of climate and land use change to annual streamflow of the area from 1956 to 2010. The results indicated that the precipitation among years presented significantly a decreasing tendency, and the annual runoff also had a significant decreasing trend with the change point occurred in 1979. Climate variations was the strongest contributor to the reduction in mean annual streamflow of Chaohe and Baihe watershed, and the contribution rate reached 59.3% and 93.5%, respectively, while the remaining caused by land-use change. The effects of different type of land-use on the reduction in annual streamflow were quite different, for instance, the contribution rates of forest land was about 67%, which was more than the farmland of 18% and the grassland of 15%. The water body and unused land, which have a small proportion and a small change ranges in this region, were not observed to have a clear impact on annual streamflow. The results provide a theoretical reference for basin water resources management and land-use planning in Chaobai river basin.
Number of references:26
Main heading:Land use
Controlled terms:Climate change - Climate models - Forestry - Landforms - Runoff - Separation - Stream flow - Supply chains - Water resources - Watersheds
Uncontrolled terms:Annual runoff - Change-points - Climate variation - Contribution rate - Forest land - Land-use change - Land-use planning - North China - Quantitative effects - Research object - River basins - River watersheds - Rocky Mountains - Water resources management - Waterbodies
Classification code:913 Production Planning and Control; Manufacturing - 912 Industrial Engineering and Management - 821.0 Woodlands and Forestry - 802.3 Chemical Operations - 631.1 Fluid Flow, General - 921 Mathematics - 481.1 Geology - 444.1 Surface Water - 444 Water Resources - 443 Meteorology - 403 Urban and Regional Planning and Development - 451 Air Pollution
DOI:10.3969/j.issn.1002-6819.2012.22.035
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 18>

Accession number:20125115818521
Title:Multi-objective optimization of 6MF-30 pneumatic extinguishers based on CFD
Authors:Xin, Zhe (1); Wang, Shunxi (1); Li, Zhaojing (1); Yun, Feng (1); Guan, Qingyun (1); Huo, Xiaolei (1); Zhang, Kepeng (2)
Author affiliation:(1) College of Engineering, China Agricultural University, Beijing 100083, China; (2) Shaanxi Heavy Duty Automobile Company Limited, Xi'an 710200, China
Corresponding author:Xin, Z.(xinzhecau@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:39-44
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to solve the problems of low efficiency and excessive noise of 6MF-30 pneumatic extinguisher, the experiment and simulation were carried out under the working condition. The efficiency and SPL of the extinguisher were taken as objective parameters for optimal design and optimal variables and results were obtained by C programming. Taking the complex three-dimensional flow in the extinguisher into account, a three-dimensional model was built based on the multi-objective optimal structural parameters. The simulated results showed that the sound power level of the optimized extinguisher increased by 1.96% compared to original machine. However, the efficiency, outlet total pressure, outlet flow and outlet velocity increased by 17.56%, 23.96%, 11.56% and 11.33%, respectively. The combination property of the extinguisher is improved after optimization. The research can provide a reference for design of pneumatic extinguisher.
Number of references:27
Main heading:Three dimensional
Controlled terms:Computer simulation - Efficiency - Multiobjective optimization - Pneumatics - Structural optimization
Uncontrolled terms:C programming - Multi objective - Multi objective optimizations (MOO) - Objective parameters - Optimal design - Optimal variables - Outlet flows - Outlet velocities - Simulated results - Sound power levels - SPL - Structural parameter - Three-dimensional flow - Three-dimensional model - Total pressure
Classification code:632.3 Pneumatics - 723.5 Computer Applications - 913.1 Production Engineering - 921.5 Optimization Techniques
DOI:10.3969/j.issn.1002-6819.2012.22.006
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 19>

Accession number:20125115818555
Title:Determination and analysis of water desorption and adsorption isotherms of macadamia nut kernel flour
Authors:Wang, Yunyang (1); Zhang, Li (1); Wang, Shaojin (2); Tang, Juming (3); Li, Yuanrui (1)
Author affiliation:(1) College of Food Science and Engineering, Northwest Agriculture and Forestry University, Yangling 712100, China; (2) College of Mechanical and Electronic Engineering, Northwest Agriculture and Forestry University, Yangling 712100, China; (3) Department of Biological Systems Engineering, Washington State University, Pullman, 99164-6120, United States
Corresponding author:Wang, Y.(wyy10421@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:288-292
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to provide technical data for macadamia nut kernel flour drying and preservation, adsorption and desorption isotherms of macadamia nut kernel flour at room temperature (25°C) were determined. Non-linear regression analysis was used to evaluate the fitness of the commonly used models as BET, GAB, Halsey, Henderson, Oswin and Smith based on the experimental data, and to determine the best models and their parameters. The results showed that the obtained desorption isotherm was of type II, and the adsorption was of type III according to IUPAC classification. The hysteresis loop was of type H3. The best model fitted for desorption isotherm was GAB model, and that for adsorption was Henderson model. The parameters (A, B, C) of GAB model for desorption isotherm were 8.2439, 0.4815 and 1.3545, respectively. The parameters (A, B) of Henderson model for adsorption isotherm were 0.3006 and 0.8682, respectively.
Number of references:24
Main heading:Adsorption isotherms
Controlled terms:Adsorption - Desorption - Isotherms - Regression analysis
Uncontrolled terms:Best model - Desorption isotherms - Fitting model - GAB model - Kernel flour - Macadamia nut - Non-linear regression analysis - Room temperature - Technical data - Type II - Water desorption
Classification code:801.4 Physical Chemistry - 802.3 Chemical Operations - 922.2 Mathematical Statistics
DOI:10.3969/j.issn.1002-6819.2012.22.040
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 20>

Accession number:20125115818542
Title:Analysis on spring wheat spectrum characteristics influenced by dry-hot wind in Ningxia
Authors:Liu, Jing (1); Zhang, Xueyi (1); Ma, Guofei (1); Cao, Ning (1); Ma, Liwen (1)
Author affiliation:(1) Ningxia Key Laboratory for Meteorological Disaster Prevention and Reduction, Yinchuan 750002, China
Corresponding author:Liu, J.
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:189-199
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to apply remote sensing technology to study the effects of the wheat dry-hot wind, the canopy spectrum on different hazard degree were measured before and after dry-hot wind occurring by Unspec-SC spectrum remote sensing instrument. By resampling the observed data, the spectrum response curves under different hazard degree were obtained. Classification of hazard degree of dry-hot wind and high spectral characteristics of each degree were studied combined with the observation of the opened awn rate, thousand-grain weight, etc. By constructing the RVI, NDVI and the other vegetation indices according to the spectral range of the EOS/MODIS visible channel, each hyperspectral vegetation index of wheat dry-hot wind level indicators and discriminant equation were established. The results showed that the reflectance spectrums of the different wheat dry-hot wind damages were certainly obvious differences. With the aggravation of wheat dry-hot wind, near-infrared platform were reduced, red valley elevation, slope of the red edge were declined, red edge position blue were shifted. The correlations were highly significant among wheat dry-hot wind hazard degree with RVI, NDVI, PVI, red edge vegetation index NDVI rededge and position λ rep. Synthesized EOS MODIS corresponding channel value RVI, NDVI could reflect the difference of dry-hot wind hazard degree, and NDVI was more significant than RVI. It indicated that the use of EOS MODIS remote sensing data could distinguish the wheat dry-hot wind harm degree. The results provide a reference for monitoring and evaluation the wheat dry-hot wind hazard degree on large wheat field by remote sensing.
Number of references:27
Main heading:Grain (agricultural product)
Controlled terms:Hazards - Indicators (instruments) - Radiometers - Remote sensing - Spectrum analysis - Vegetation
Uncontrolled terms:Canopy spectrum - EOS MODIS - Hazard degree - HyperSpectral - Near Infrared - Observed data - Red edge - Red edge position - Reflectance spectrum - Remote sensing data - Remote sensing instruments - Remote sensing technology - Resampling - Spectral characteristics - Spectral range - Spectrum characteristic - Spectrum response - Spring wheat - Vegetation index - Visible channels - Wheat fields - Wind damage - Wind hazards
Classification code:944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 943 Mechanical and Miscellaneous Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 941 Acoustical and Optical Measuring Instruments - 921 Mathematics - 914.1 Accidents and Accident Prevention - 821.4 Agricultural Products - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 731.1 Control Systems
DOI:10.3969/j.issn.1002-6819.2012.22.027
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 21>

Accession number:20125115818552
Title:Preservative effects of coating with compound agents combined with extract from Kadsura Longipedunculata on chicken eggs at room temperature
Authors:Zhao, Meimei (1); Yu, Xin (1); Yang, Pengbin (1); Yang, Jing (1)
Author affiliation:(1) College of Light Industry and Food Science, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
Corresponding author:Yu, X.(yuxin1959@yahoo.com.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:269-275
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:To prolong the storage period of chicken eggs at room temperature, antibacterial emulsion were prepared through combining Chinese medicine Kadsura extract by ethanol, VC, citric acid, sucrose fatty acid ester, carboxymethyl cellulose and xanthan gum, which was coated on fresh eggs. The results showed that with 5-week storage at 30°C, the freshness, weight-loss rate, yolk index Haugh unit concentration of thick albumen (egg white), pH value, dense-dilute albumen ratio, thick albumen height of the chicken eggs coated with Chinese medicine Kadsura extract by ethanol combined with sucrose fatty acid ester were 100%, 5.35%, 0.33, 54, 45%, 8.67, 0.89 and 3.40 mm, while those of the control were 11.23%, 16.08%, 0.19, 43, 23.09%, 9.29, 0.26 and 2.39 mm, respectively. The results suggested that this preservative coating film of kadsura extract exhibited an excellent effect on fresh-keeping of chicken eggs, The group added with sucrose fatty acid esters was the best one. This research provides a reference for preservation of eggs coated with Chinese medicine.
Number of references:30
Main heading:Animals
Controlled terms:Citric acid - Coatings - Emulsification - Energy storage - Esterification - Esters - Ethanol - Extraction - Fatty acids - Medicine - Sugar (sucrose)
Uncontrolled terms:Albumen height - Carboxy-methyl cellulose - Chinese medicines - Coating films - Compound - Compound agents - Egg white - Eggs - pH value - Preservative effect - Room temperature - Storage periods - Sucrose fatty acids - Traditional Chinese Medicine - Weight loss - Xanthan Gum
Classification code:822 Food Technology - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 814 Leather and Tanning - 804.1 Organic Compounds - 802.3 Chemical Operations - 822.3 Food Products - 802.2 Chemical Reactions - 539 Metals Corrosion and Protection; Metal Plating - 471 Marine Science and Oceanography - 461.6 Medicine and Pharmacology - 461 Bioengineering and Biology - 702 Electric Batteries and Fuel Cells
DOI:10.3969/j.issn.1002-6819.2012.22.037
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 22>

Accession number:20125115818547
Title:Effects of pretreatments with steam-explosion using solar energy and microwave irradiation on biogas production of corn stalk
Authors:Liu, Weiwei (1); Ma, Huan (2); Cao, Chengmao (1); Yang, Zhiliang (1); Zhao, Minhui (3); Kong, Xiaoling (1); Hu, Xiaochen (1)
Author affiliation:(1) Technology School of Anhui Agricultural University, Hefei 230036, China; (2) Life Sciences School of Anhui Agricultural University, Hefei 230036, China; (3) Yunnan Tianji Xuneng New Energy Co. Ltd., Kunming 650051, China
Corresponding author:Cao, C.(ccm@ahau.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:227-234
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:To improve the biogas production efficiency, steam-explosion using solar energy and microwave irradiation were employed as pretreatments for corn stalks in this study. The effects of two pretreatments on biogas production were investigated at 35°C fermentation temperature. The results showed that with the inoculum of 200 g, fermentation temperature of 35°C and organic loading rate of 22.6 g/L, two pretreatments could disrupt the rigid structure of corn stalks, which make them expose more accessible surface area of substrate to anaerobic microorganism. The content of cellulose, hemicellulose and lignin of corn stalks pretreated by solar energy steam-explosion and microwave irradiation were reduced by 7.82%, 50.56%, 36.33% and 20.13%, 20.97%, 54.03%, respectively. The total solid (TS) biogas production rate of two pretreated samples were reach to 239.89 and 281.45 mL/g, while the VS (volatile solids) rate were 296.02 and 332.28 mL/g, respectively with solar energy steam-explosion and microwave irradiation pretreatment. Moreover, compared with the control, the average daily biogas yields of two pretreated samples were 320 and 334 mL, which were increased by 15.11% and 20.14%, and the hydraulic retention time (HRT) was decreased by 42.11% and 31.58%. The present work provides a reference for the crop stalks pretreatment and improving the efficiency of biogas plant.
Number of references:35
Main heading:Biogas
Controlled terms:Cellulose - Efficiency - Explosions - Fermentation - Loading - Microwave irradiation - Solar energy - Straw
Uncontrolled terms:Accessible surface areas - Anaerobic microorganisms - Biogas plants - Biogas production - Corn - Corn stalk - Fermentation temperature - Hydraulic retention time - Organic loading rates - Pre-Treatment - Pre-treatments - Steam explosion - Total solids - Volatile solid
Classification code:821.5 Agricultural Wastes - 815.1.1 Organic Polymers - 802.2 Chemical Reactions - 913.1 Production Engineering - 711 Electromagnetic Waves - 615.2 Solar Power - 502.1 Mine and Quarry Operations - 672 Naval Vessels
DOI:10.3969/j.issn.1002-6819.2012.22.032
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 23>

Accession number:20125115818530
Title:Effects of irrigation methods on water use efficiency and fruit quality of jujube in arid area
Authors:Ren, Yuzhong (1); Wang, Shuixian (3); Xie, Lei (4); Dong, Xinguang (1)
Author affiliation:(1) College of Water Conservancy and Civil Engineering, Xinjiang Agriculture University, Urumqi 830052, China; (2) Water Resources Bureau of Weifang City, Weifang 261031, China; (3) College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China; (4) Xinjiang Institute of Water Conservancy, Urumqi 830006, China
Corresponding author:Dong, X.(xinguangdong@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:95-102
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to investigate the effects of irrigation methods on water distribution, growth and fruit quality in arid areas, mature jujube trees in the experimental zone of Akesu City were studied in 2009. Irrigation water distribution, jujube growth, yield, water use efficiency and fruit quality were conducted based on surface irrigation, drip irrigation and micro-irrigation in the this study. The results indicated that the amount of leaching were decreased under drip irrigation and micro irrigation compared to the surface irrigation. As the consequences, compared to surface irrigation, the above irrigation systems saved water by 49%. The growth of the jujube tree for all of the treatments were no significant. In Jujube growth stage, the leaf area index, chlorophyll content and production were increased under drip and micro irrigation. Jujube yields were increased by 22% and 16% and water use efficiency (WUE) were increased by 240% and 230%, respectively. The fruit diameter, fruit weight, reducing sugar content and the content of Vc were significantly increased. Thus, it suggested that fruit quality and production were significantly increased under drip irrigation and micro irrigation. The research can provide a reference for water saving irrigation in arid regions.
Number of references:30
Main heading:Irrigation
Controlled terms:Arid regions - Chlorophyll - Efficiency - Forestry - Fruits - Growth (materials) - Leaching - Water conservation - Water resources - Water supply - Water supply systems
Uncontrolled terms:Arid area - Chlorophyll contents - Drip irrigation - Experimental zone - Fruit quality - Fruit weight - Growth stages - Irrigation methods - Irrigation systems - Irrigation waters - Jujube tree - Leaf Area Index - Microirrigation - Reducing sugars - Surface irrigation - Water distributions - Water-saving irrigation - Water-use efficiency - Yield
Classification code:951 Materials Science - 913.1 Production Engineering - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 804.1 Organic Compounds - 533.1 Ore Treatment - 446.1 Water Supply Systems - 444 Water Resources
DOI:10.3969/j.issn.1002-6819.2012.22.015
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 24>

Accession number:20125115818538
Title:Underlying surface characteristics and observation of blown-sand movement in Ulanbuh Desert along Bank of Yellow River
Authors:Du, Heqiang (1); Xue, Xian (1); Sun, Jiahuan (1)
Author affiliation:(1) Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
Corresponding author:Du, H.(dilikexue119@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:156-165
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:To understand the characteristic of the surface and the blown-sand movement of the Ulanbuh Desert along the Yellow River bank, the dune formations, sand particle granularity, sand flux and aeolian saltation structures were analyzed, and the results were displayed. 1) The rate of width to height of the transversal dunes in this area was about 12.75. 2) The mean sand particle diameter, sorting coefficient and skewness were decreased from the inter-dunes to the slip face; the grain size distribution on different positions of dune were all displayed positively biased and narrow unimodal. 3) Whether the wind speed exceed the threshold wind velocity, only the wind profile above the inter-dunes and that above the dune crest followed the logarithmic functions. In most of situations, the wind profile above the foot of stoss slope followed the power functions. The distributed functions of wind profile above the slip face and that above the foot of lee slope showed a chaotic situation. 4) In strong wind and gentle wind environment, the wind velocity were decelerated from the inter-dunes to the foot of stoss slope, accelerated from the foot of stoss slope to the dune crest, decelerated from the dune crest to the slip face again, and then accelerated from the slip face to the foot of lee slope. 5) More violent blown-sand movement displayed on the dune crest. More than 90% sand transport in aeolian saltation cloud concentrated below the height of 10 cm, and the profiles of aeolian cloud at different positions of dune followed the cubic functions. 6) There is a close feedback relationship existing between the surface and the blown-sand movement. At last, based on the observation, some suggestions for building proper aeolian hazard protection system in the Ulanbuh Desert along the Yellow River were proposed. This study can provide a reference for prevention of the aeolian hazard in this region.
Number of references:36
Main heading:Sand
Controlled terms:Erosion - Grain size and shape - Hazards - Landforms - Particles (particulate matter) - Wind effects
Uncontrolled terms:Cubic function - Distributed function - Grain size distribution - Hazard protection - Logarithmic functions - Power functions - Sand flux - Sand particles - Sand transport - Strong winds - Underlying surface - Unimodal - Wind environment - Wind profiles - Wind speed - Wind velocities - Yellow river
Classification code:951 Materials Science - 914.1 Accidents and Accident Prevention - 804 Chemical Products Generally - 801.4 Physical Chemistry - 505 Mines and Mining, Nonmetallic - 483 Soil Mechanics and Foundations - 481.1 Geology - 443.1 Atmospheric Properties - 407 Maritime and Port Structures; Rivers and Other Waterways
DOI:10.3969/j.issn.1002-6819.2012.22.023
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 25>

Accession number:20125115818516
Title:Spatial distribution characteristics of arable land grade in Western China
Authors:Kong, Xiangbin (1); Zhang, Qingpu (1)
Author affiliation:(1) College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China; (2) Key Laboratory for Farmland Land Quality and Monitoring of National Ministry of Land Resources, Beijing 100193, China
Corresponding author:Kong, X.(kxb@cau.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:1-7
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Understanding the distribution characteristics of arable land grade in the Western China is significant to make the scientific decision base for the use and improvement in arable land quality. In this study, the distribution characteristics of the arable land grade in the Western China including 12 provinces were analyzed based on the accomplishments of cultivated land classification in China. The results showed that the average arable grade was 11.2 and ranged from 4 to 15, compared with the national level, which was relatively lower. There was a great gap for arable land grade among the different provinces. The arable land grade in the southern provinces such as Guangxi, Sichuan, Chongqing, etc, had a higher quality, which ranged from 6 to 10, however, that in northern provinces such as Gansu, Neimeng, Qinghai etc, had a lower grade and that ranged from 10 to 15. According to the land utilization zone in China, arable land grade in southwest zone was higher than that in northwest zone and Qinghai-Tibet zone. The arable land grade was significant different with the different agricultural grading zones. Arable land grade was higher in such agricultural grading zones as south China, the southern Yangzi river, and Sichuan basin than that in Tibet plateau, Inter- Mongolia region, and the northeast of China. Arable land grades were increased with the increasing in cropping indicator, and the available degree of irrigation. The arable land grade was higher in low altitude than that in high altitude within the same agricultural grading zone. The results indicated that the arable land use and policy making for improvement in arable land quality should be formulated in accord with the distribution characteristics of the arable land. This research provides a reference for policy making about space arrangement optimization and quality improvement for arable land in Western China.
Number of references:34
Main heading:Land use
Controlled terms:Agriculture - Classification (of information) - Decision making - Optimization
Uncontrolled terms:Arable land - Chongqing - Cultivated lands - Distribution characteristics - Guangxi - Land evaluation - Land utilization - Low altitudes - Mongolia - National level - Policy making - Quality improvement - Sichuan - Sichuan Basin - South China - Space arrangement - Tibet Plateau - Western China - Western region - Yangzi River
Classification code:403 Urban and Regional Planning and Development - 716.1 Information Theory and Signal Processing - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 912.2 Management - 921.5 Optimization Techniques
DOI:10.3969/j.issn.1002-6819.2012.22.001
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 26>

Accession number:20125115818537
Title:Simulation of terrain evolution in small loess watershed based on cellular automata
Authors:Cao, Min (1); Tang, Guo'an (1); Zhang, Fang (1); Yang, Jianyi (1)
Author affiliation:(1) Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing 210046, China
Corresponding author:Cao, M.(caomin@njnu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:149-155
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:The Loess Plateau is divided into two basic types of positive terrain and negative terrain by the zigzag loess shoulder-lines on the surface. The evolution of small loess watershed is a miniature of the landform development in the Loess Plateau. Cellular automata modeling method was adopted to simulate the dynamic terrain evolution of an indoor small loess watershed model under artificial rainfall condition in this study. DEMs with 10 mm grid size were obtained by monitoring the landform development of the small loess watershed using close-range digital photogrammetric method. The iterative process realistically simulated the positive and negative terrain evolution that the loess negative terrain areas continuously eroded the positive terrain in the small loess watershed. The simulation depicted this erosion vividly, which could also reflect the appearance of a very important phenomenon-loess sinkhole. The development of loess sinkhole near the middle gully head revealed the function of loess sinkhole in the formation of loess channel system. The simulation result was comparatively good in terms of consistent accuracy and spatial distribution. It is demonstrated that the simulation of terrain evolution based on cellular automata can dig out the evolution mechanism of loess terrain within a small loess watershed.
Number of references:31
Main heading:Landforms
Controlled terms:Cellular automata - Fisher information matrix - Iterative methods - Watersheds
Uncontrolled terms:Artificial rainfall - Cellular automata modeling - Channel systems - Evolution mechanism - Fisher discrimination - Grid size - Iterative process - Loess Plateau - Positive-negative terrain - Terrain evolution - Watershed models
Classification code:444.1 Surface Water - 481.1 Geology - 723 Computer Software, Data Handling and Applications - 921 Mathematics - 921.6 Numerical Methods - 922 Statistical Methods
DOI:10.3969/j.issn.1002-6819.2012.22.022
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 27>

Accession number:20125115818544
Title:Precision analysis and validation of multi-sources landcover products derived from remote sensing in China
Authors:Song, Hongli (1); Zhang, Xiaonan (1)
Author affiliation:(1) Resources of College, Hebei University of Engineering, Handan 056038, China
Corresponding author:Zhang, X.(360217051@qq.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:207-214
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Precise state and regional land cover mapping are foundational data in the studies of land surface processes and modeling, such as climate change, biodiversity conservation, ecosystem assessment, and environmental modeling. This study aimed to perform the validation and comparison of the four global land cover datasets, and examine the suitability and accuracy of different coarse spatial resolution datasets in mapping land cover categories across China. The results indicated that the four land cover products demonstrated the consistency in whole scale, but in local scale, display a conspicuous difference especially in southeast and southwest zones. GLC2000 had the best consistency in the relative index and overall accuracy, which were 0.92 and 55.86% respectively; the GLOBCOVER had the worst consistency compared to the reference data, the relative index and overall accuracy were 44.71% and 0.31. The four land cover products showed the spatial confusion especially in forest, shrub, cropland and grassland, which implied the coarse resolution remote sensing data was helpless in discerning the land cover with the leaf type. The result will provide a reasonable reference for using these datas.
Number of references:26
Main heading:Landforms
Controlled terms:Classification (of information) - Climate change - Conservation - Remote sensing
Uncontrolled terms:Biodiversity conservation - China region - Data sets - Ecosystem assessment - Environmental modeling - Land cover - Land cover datasets - Land cover mapping - Land-surface process - Local scale - Mapping land - Precision analysis - Precision validation - Reference data - Remote sensing data - Scale - Spatial resolution
Classification code:451 Air Pollution - 454 Environmental Engineering - 481.1 Geology - 716.1 Information Theory and Signal Processing - 731.1 Control Systems
DOI:10.3969/j.issn.1002-6819.2012.22.029
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 28>

Accession number:20125115818548
Title:Effects of additive superphosphate on NH<inf>3</inf>, N<inf>2</inf>O and CH<inf>4</inf> emissions during pig manure composting
Authors:Luo, Yiming (1); Li, Guoxue (1); Schuchardt, Frank (2); Wang, Kun (1); Jiang, Tao (3); Luo, Wenhai (1)
Author affiliation:(1) College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China; (2) Institute of Agricultural Technology and Biosystems Engineering, Johann Heinrich von Thuenen-Institute, Braunschweig 38116, Germany; (3) College of Chemistry and Biology, Leshan Normal College, Leshan 614004, China
Corresponding author:Li, G.(ligx@cau.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:235-242
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:To study the effects of superphosphate (SP) on NH<inf>3</inf>, N<inf>2</inf>O and CH<inf>4</inf> emissions, an experiment of pig manure composting for 56 days was carried out. Besides control, four mixtures (1.2 m3 each) were treated with different amount of SP additive of 3.3%, 6.6%, 9.9% and 13.2% (dry matter weight). The results indicated that, during 56 days, SP additives in pig manure composting at 3.3% to 13.2% decreased the ammonia volatilization, total nitrogen and carbon losses significantly. Adding more than 9.9% of SP caused adverse effects on the degradation of organic materials. SP additive at 3.3% and 6.6% reduced total NH<inf>3</inf> emission by 24.1% and 43.4%, N<inf>2</inf>O emission by 22.2% and 27.7%, and CH<inf>4</inf> emission by 62.9% and 22.4%, respectively. Compared with the control, the total greenhouse gas emissions (CO<inf>2</inf>-eq) of three treatments with SP additive at less than 9.9% were decreased by 30%. It is concluded that SP as a cheap phosphorus fertilizer can be used as an additive in pig manure composting to reduce the emissions and improve the value of compost as fertilizer; the feasible addition amount of SP could be about 3.3% to 6.6% of raw materials dry weight.
Number of references:32
Main heading:Additives
Controlled terms:Ammonia - Carbon dioxide - Composting - Fertilizers - Gas emissions - Greenhouse gases - Mammals - Manures
Uncontrolled terms:Adverse effect - Ammonia volatilization - Carbon loss - Dry matters - Dry weight - Organic materials - Phosphorus fertilizer - Pig manures - Superphosphate - Total nitrogen
Classification code:821 Agricultural Equipment and Methods; Vegetation and Pest Control - 804.2 Inorganic Compounds - 804 Chemical Products Generally - 821.5 Agricultural Wastes - 803 Chemical Agents and Basic Industrial Chemicals - 452 Municipal and Industrial Wastes; Waste Treatment and Disposal - 451.1 Air Pollution Sources - 452.3 Industrial Wastes
DOI:10.3969/j.issn.1002-6819.2012.22.033
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 29>

Accession number:20125115818554
Title:Analysis on internal moisture changes of carrot slices during drying process using low-field NMR
Authors:Zhang, Xukun (1); Zhu, Shusen (1); Huang, Jianhua (1); Xu, Gang (2); Xu, Jianguo (2); Li, Huadong (2)
Author affiliation:(1) Key Laboratory of Non-Destructive Testing (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China; (2) Food Engineering Innovation Center of Jiangxi Academy of Sciences, Nanchang 330039, China
Corresponding author:Li, H.(shuhua89@sohu.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:282-287
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to investigate the characteristics of internal moisture change of carrot slices at different temperatures during drying process, an hot air drying experiment on carrot slices using the electric heating thermostatic drying oven at different temperatures, which were respectively 40, 50, 60, 70 and 80°C, have been carried out. The internal moisture changes from the perspective of transverse relaxation time (T<inf>2</inf>) inversion spectrum of low-field nuclear magnetic resonance were analyzed. Results showed that moisture states and moisture distribution changed in drying process and the moisture with high degree of freedom moved to the moisture with low degree of freedom. The drying rate was accelerated with the rise of drying temperature, however, the drying rate was restrained because the material surface crusting hindered the outmigration of water at 80°C. This research can provide theoretical basis for drying technology and conversion point of variable temperature combination drying of fruits and vegetables.
Number of references:32
Main heading:Drying
Controlled terms:Moisture - Nuclear magnetic resonance
Uncontrolled terms:Carrot slice - Combination drying - Drying process - Drying rates - Drying technology - Drying temperature - High Degree of Freedom - Hot air drying - Inversion spectrum - Low degree - Low-field NMR - Material surface - Moisture distribution - Moisture state - Theoretical basis - Transverse relaxation time - Variable temperature
Classification code:642.1 Process Heating - 801.4 Physical Chemistry - 932.2 Nuclear Physics
DOI:10.3969/j.issn.1002-6819.2012.22.039
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 30>

Accession number:20125115818518
Title:Development and test of straw grinder with axial vibration screen type
Authors:Fu, Min (1); Li, Rui (1); Ma, Lei (1)
Author affiliation:(1) Mechanical and Electrical Engineering College of Northeast Forestry University, Harbin 150040, China
Corresponding author:Fu, M.(fumin1996@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:16-22
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:A new straw grinder which could make 1000 kg of 1 mm powder in 1 hour by a creatively designed vibrating screen to satisfy the demand of scale and fine grinding of straw. Vibrating screen with amplitude parallel to rotor axial had been developed and designed. ANSYS software was used to analyze spindle static, vibration mode, and hummer static analysis in different load. And ADAMS software was used for dynamic balance analysis of the rotor tools. The performance test of the prototype showed that the grinder production rate of was 1155 kg/h, power consumption 33.4 kWh/t; crushed particle with less than 1.2 mm was accounted for 98% of the sample quality, and with less than 0.9 mm accounted for 86%; vibration intensity of the rotor was level B in accordance with ISO-2372. And the performance of the straw grinder satisfied the requirement of design.
Number of references:32
Main heading:Grinding mills
Controlled terms:Biomass - Grinding (machining) - Static analysis - Straw - Vibrating screens
Uncontrolled terms:ADAMS software - ANSYS software - Axial vibrations - Dynamic balance - Fine grinding - Performance tests - Production rates - Sample quality - Simulation - Vibration intensity - Vibration modes
Classification code:605.1 Small Tools, Powered - 606.2 Abrasive Devices and Processes - 723.1 Computer Programming - 802.1 Chemical Plants and Equipment - 821.5 Agricultural Wastes
DOI:10.3969/j.issn.1002-6819.2012.22.003
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 31>

Accession number:20125115818543
Title:Spatial distribution characteristics of photosynthetic active radiation in cotton canopy based on geo-statistics
Authors:Li, Yabing (1); Mao, Shuchun (1); Feng, Lu (1); Han, Yingchun (1); Wang, Guoping (1); Fan, Zhengyi (1); Sun, Enhong (1)
Author affiliation:(1) State Key Laboratory of Cotton Biology, Cotton Research Institute, Chinese Academy of Agriculture Sciences, Anyang 455000, China
Corresponding author:Li, Y.(criliyabing@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:200-206
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Photosynthetic active radiation (PAR) using efficiency is an important factor affecting crop yield and quality. Precisely and accurately quantifying PAR spatial distribution within crop canopy is of great significance for reasonable plant density arrangement, plant architecture molding, and variety selection for high yield. In this study, Geo-statistical theory and methods were applied to study the PAR spatial distribution in 6 different cotton plant densities. Spatial correlations of PAR and spatial distribution characteristics of transmittance in different cotton communities were studied. The results showed that: 1) During the early growth stage, PAR spatial distribution had a moderate spatial correlation, with most of the structural component variance proportions below 0.75. However, during the mid-late growth stage, PAR spatial distribution had a high degree of spatial correlation, with almost all the structural component variance proportions above 0.9; 2) At the early cotton growth stage, PAR transmittance exhibited a long and narrow "V" shape and were gradually reduced from the middle toward the rows. At the mid-late growth stage, PAR transmittance exhibited a short and shallow "V" shape in the upper canopy and that in the lower part showed gradually linear decrease; 3) The variations of mean PAR transmittance over the whole growth period in 6 cotton communities presented quadratic trends. PAR interception rates were increased over the plant density, and cotton community biomass were increased gradually, but the economic production began to decline in the plant density of 69, 000 plants/hm2.
Number of references:30
Main heading:Cotton
Controlled terms:Agriculture - Heat radiation - Spatial distribution - Spatial variables measurement
Uncontrolled terms:Cotton growth - Cotton plants - Crop canopy - Crop yield - Distribution characteristics - Early growth - Economic production - Geo-statistics - Growth period - Growth stages - High yield - Linear decrease - Photosynthetic active radiations - Plant architecture - Plant densities - Spatial correlations - Structural component - Theory and methods - Transmittance - Upper canopy
Classification code:641.2 Heat Transfer - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 821.4 Agricultural Products - 921 Mathematics - 943.2 Mechanical Variables Measurements
DOI:10.3969/j.issn.1002-6819.2012.22.028
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 32>

Accession number:20125115818536
Title:Estimating gully development rates in Hilly Loess Region of Western Shanxi province based on QuickBird images
Authors:Li, Zhen (1); Zhang, Yan (1); Yao, Wenjun (1); Zhu, Qingke (1)
Author affiliation:(1) Key Laboratory of Soil and Water Conservation and Desertification Combating, Ministry of Education, Beijing Forestry University, Beijing 100083, China
Corresponding author:Zhang, Y.(zhangyan9@bjfu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:141-148
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Gully erosion is a significant source of damaging land resources and river sediment. In order to explore the effectiveness of high-resolution remote sensing images in monitoring the development of gully, four small watersheds on the eastern hilly loess plateau were selected to compare changes of the area and circumference of the gully region and the headcut development rate of gully from 2003 to 2010, based on high-resolution remote sensing data (QuickBird images) and GIS. Factors controlling gully development were analyzed including vegetation cover and land-use. The results showed that the increasing rate of area within the gully region ranged from 0.25% to 0.48% in four small watersheds, and the change of circumference was between 1.56% and 2.61%. Gully expanded mainly on side branches with the rate of 0.36-0.44 m/a. Vegetation coverage larger than 60% on the drainage area could evidently inhibit the development of a gully. The change of gully area, circumferences and gully headcut development rates were all smaller in watersheds with more forest coverage. This study suggested that high resolution remote sensing can be used to derive gully headcut development rate quickly and accurately at middle spatial and time scales.
Number of references:25
Main heading:Landforms
Controlled terms:Image reconstruction - Land use - Remote sensing - Sediments - Vegetation
Uncontrolled terms:Development rate - Drainage area - Gully - Gully erosion - Headcuts - High resolution remote sensing - Land resources - Loess Plateau - QuickBird images - River sediments - Side branches - Small watersheds - Time-scales - Vegetation cover - Vegetation coverage
Classification code:403 Urban and Regional Planning and Development - 481.1 Geology - 483 Soil Mechanics and Foundations - 731.1 Control Systems - 741 Light, Optics and Optical Devices - 821 Agricultural Equipment and Methods; Vegetation and Pest Control
DOI:10.3969/j.issn.1002-6819.2012.22.021
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 33>

Accession number:20125115818545
Title:Determination of economical insulation thickness for fordigester based on heat pump heating system
Authors:Shi, Huixian (1); Huang, Chao (1); Zhu, Hongguang (1); Pei, Xiaomei (2); Hu, Meiqin (1); Guo, Changcheng (1)
Author affiliation:(1) Modern Agriculture Science and Engineering College of Tongji University, Shanghai 200092, China; (2) College of Architecture and Urban Planning Tongji University, Shanghai 200092, China
Corresponding author:Shi, H.(huixian_shi@mail.tongji.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:215-221
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to optimize the design of heat pump heating system for biogas engineering and reduce the initial investment and operating cost, economical insulation thickness (EIT) of anaerobic digester was studied in this study. Firstly, the comprehensive heat transfer coefficient theory was applied to simplify the calculation of thermal dissipation load for the digester. The calculation method of the annual dynamic load was obtained by means of hourly meteorological parameters. Then the mathematical model of EIT was developed by annul-cost method. The simplified computational formula of EIT was applied to a project in Shanghai, and the values of EIT were determined between 0.05 and 0.07 m. With 3.5 of performance coefficient of heat pump, the EIT of five insulation materials including expanded polystyrene, extruded polystyrene, phenol resin, polyurethane, polyvinyl chloride were 0.092, 0.063, 0.054, 0.048 and 0.046 m, respectively.
Number of references:31
Main heading:Heat pump systems
Controlled terms:Biogas - Dynamic loads - Heating equipment - Insulating materials - Insulation - Mathematical models - Phenols - Polystyrenes
Uncontrolled terms:Anaerobic digester - Annual dynamics - Computational formula - Dynamic heat - Expanded polystyrene - Extruded polystyrenes - Heat pumps - Heating system - Insulation materials - Insulation thickness - Meteorological parameters - Performance coefficients - Phenol resin - Thermal dissipation
Classification code:815.1.1 Organic Polymers - 804.1 Organic Compounds - 642.2 Industrial Furnaces and Components - 921 Mathematics - 641.2 Heat Transfer - 413 Insulating Materials - 408.1 Structural Design, General - 522 Gas Fuels
DOI:10.3969/j.issn.1002-6819.2012.22.030
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 34>

Accession number:20125115818528
Title:Spatiotemporal variation for soil salinity of field land under long-term mulched drip irrigation
Authors:Li, Mingsi (1); Liu, Hongguang (1); Zheng, Xurong (1)
Author affiliation:(1) College of Water Conservancy and Architecture Engineering, Shihezi University, Shihezi 832003, China
Corresponding author:Li, M.(leemince-709@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:82-87
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:A field that has been irrigated with mulched drip technique for 13 years was selected for researching on the effects of the long-term utilization of mulched drip irrigation technique on the evolution of soil salinity distribution. Based on the spatiotemporal variation of soil salinity distribution, the soil salinity evolution characteristics were analyzed. It was found that the soil salinity of the field was decreased substantially during the initial stage of utilizing the mulched drip irrigation, then the decrease rang was declined with the using of irrigation technique; ultimately a stable soil salinity was obtained in the field. After 13 years irrigation with mulched drip technique, soil salinity in 0-100 cm soil layer of the researched field had been declined from 20-30 to 5 g/kg, and that below 20 cm soil depth of the field margin was stable at 5-10 g/kg, which was larger than that in the corresponding soil layer of the field. But soil salt assembled at the surface of the field margin resulted in that soil salinity at the surface of field margin was larger than 20 g/kg. The salinity of entire soil layer in the field land could not be increased by the salty accumulation at soil wetting front. The study provides a reference for the reasonable use of mulched drip irrigation technique.
Number of references:22
Main heading:Soils
Controlled terms:Irrigation - Salinity measurement
Uncontrolled terms:Drip irrigation - Evolution characteristics - Field land - Field margins - Initial stages - Soil depth - Soil layer - Soil salinity - Spatio-temporal variation - Wetting fronts
Classification code:483.1 Soils and Soil Mechanics - 821.3 Agricultural Methods
DOI:10.3969/j.issn.1002-6819.2012.22.013
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 35>

Accession number:20125115818539
Title:Testing system of image processing algorithm of visual navigation system for harvester based on DaVinci technology
Authors:Zhang, Chengtao (1); Tan, Yu (1); Wu, Gang (1); Wang, Shumao (1)
Author affiliation:(1) College of Engineering, China Agricultural University, Beijing 100083, China; (2) Automotive Department, Guangxi Institute of Technology, Liuzhou 545006, China
Corresponding author:Tan, Y.(tanyu32@sina.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:166-173
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to shorten the development cycle of visual navigation system for harvester and reduce image processing algorithms test cost, after illustrating the DaVinci technology software framework and analyzing the working principle of video codec based on H.264, a system based on DaVinci technology was developed to test image processing algorithms of visual navigation system in harvester. Digital video DM6446 dual-core processor as the core, the system realized two function blocks based on DaVinci technology, the first of which was the video of field experiment encoding and acquisition, and the second was indoor test of video decoding and image processing algorithms. Experimental results showed that the system had advantages of steady performance and high real-time with the encoded video compression ratio up to 47-103 times and the decoded video frame rate 30 s-1, and many image processing algorithms could be tested simultaneously. The system provides effective analysis method for image processing algorithm of visual navigation system in harvesters.
Number of references:32
Main heading:Harvesters
Controlled terms:Algorithms - Computer programming - Image compression - Multimedia systems - Navigation - Navigation systems - Technology - Video signal processing
Uncontrolled terms:Da Vinci technology - Davinci - Development cycle - Digital videos - Dual core-processors - Effective analysis - Field experiment - Function Block - Image processing algorithm - Imaging processing - Indoor test - Software frameworks - Steady performance - Test cost - Test images - Testing systems - Video codecs - Video codes - Video decoding - Video frame - Visual Navigation - Working principles
Classification code:901 Engineering Profession - 821.1 Agricultural Machinery and Equipment - 741 Light, Optics and Optical Devices - 921 Mathematics - 723 Computer Software, Data Handling and Applications - 716.3 Radio Systems and Equipment - 434.4 Waterway Navigation - 716.4 Television Systems and Equipment
DOI:10.3969/j.issn.1002-6819.2012.22.024
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 36>

Accession number:20125115818553
Title:Prediction of shelf life for quick-frozen dumpling based on BP neural network and effective accumulated temperature theory
Authors:Pan, Zhili (1); Huang, Zhongmin (1); Wang, Na (1); Zhang, Zhuo (1); Xie, Xinhua (1); Suo, Biao (1); Lu, Banggui (1); Ai, Zhilu (1)
Author affiliation:(1) College of Food Science and Technology, He'nan Agricultural University, Zhengzhou 450002, China; (2) Zhengzhou Sanquan Food Co., Ltd., Zhengzhou 450000, China
Corresponding author:Ai, Z.(zhila@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:276-281
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to well predict the shelf life of quick frozen food during the temperature-fluctuation storage, and accurately monitor its quality changes, frozen-dumplings stored with fluctuant temperature from -28 to -12°C were studies. Physicochemical indices including acid value, peroxide value, moisture content of dumpling skin, brightness of dumpling skin and sensory evaluation were determined. BP neural network was applied to predict the shelf life of quick-frozen dumplings combined with effective accumulated temperature theory. And kinetic model was used to take comparative analysis. The results showed that the predictive value for BP neural network fitted well with the experimental value, and the maximum error was 3.29%. The maximum error of the test experiment for BP neural network was 2.74%, which was less than that of the kinetic model (5.62%). BP neural network provides a new way to predict the shelf life of quick frozen food.
Number of references:27
Main heading:Neural networks
Controlled terms:Energy storage - Forecasting - Kinetic theory - Quality control - Temperature
Uncontrolled terms:Acid value - BP neural networks - Comparative analysis - Experimental values - Frozen food - Kinetic models - Maximum error - Peroxide value - Physicochemical indices - Predictive values - Quality change - Quick frozen dumpling - Sensory evaluation - Shelf life - Temperature theory
Classification code:641.1 Thermodynamics - 702 Electric Batteries and Fuel Cells - 723.4 Artificial Intelligence - 913.3 Quality Assurance and Control - 921 Mathematics - 931.1 Mechanics
DOI:10.3969/j.issn.1002-6819.2012.22.038
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 37>

Accession number:20125115818520
Title:Force analysis of spatial 4-SPS/CU parallel mechanism
Authors:Wang, Gengxiang (1); Liu, Hongzhao (1); Yuan, Daning (1)
Author affiliation:(1) School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, China
Corresponding author:Liu, H.(liu-hongzhao@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:30-38
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:The degree of freedom of a 4-SPS/CU parallel mechanism which can perform three-dimensional rotations and translation along Z axis was analyzed based on the screw theory, and concluded that this parallel mechanism was a non-overconstrained mechanism. By the dismantle-bar method, the static equilibrium equations of the mechanism were set up. The equations' number are more than the unknown variables in the static equilibrium equations (belong to overdetermined equation), and the number of redundant equations were equal to the passive degrees of freedom. All of the forces/torques of each component of the mechanism was obtained by solving the static equilibrium equations which got rid of the redundant equilibrium equations corresponding to passive degree of freedom. The simulation curves of the driving force and constraint reactions were given with change of the mechanism's position and posture. It was confirmed that the mechanism had better carrying capacity than other 4-DOF parallel mechanism without the driven chain. The research results could provide the statics analysis method for the application of engineering and structure design.
Number of references:30
Main heading:Mechanisms
Controlled terms:Equations of motion - Kinematics - Screws - Static analysis
Uncontrolled terms:Analysis method - Constraint reactions - Degree of freedom - Driving forces - Equation of motion - Equilibrium equation - Force analysis - Non-overconstrained - Parallel mechanisms - Research results - Screw theory - Simulation curves - Static equilibrium equations - Structure design - Three-dimensional rotation
Classification code:601.3 Mechanisms - 605 Small Tools and Hardware - 723.1 Computer Programming - 931.1 Mechanics
DOI:10.3969/j.issn.1002-6819.2012.22.005
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 38>

Accession number:20125115818549
Title:Time sequence and mode partition of high-standard prime farmland construction in Zhongjiang county, Sichuan province
Authors:Feng, Rui (1); Wu, Kening (1); Wang, Qian (1)
Author affiliation:(1) School of Land Science and Technology, China University of Geosciences, Beijing 100083, China; (2) Key Laboratory of Land Regulation Ministry of Land and Resources, Beijing 100035, China
Corresponding author:Wu, K.(knwu@sohu.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:243-251
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Aimed at the construction requirements with concentration, fully supported facilities and friendly environment, taking Zhongjiang county as study area, a reasonable way in mapping out the time sequence and construction mode of high-standard prime farmland was investigated. And the time sequence and mode partition of high-standard prime farmland construction were determined by the technique for order preference by similarity to ideal solution (TOPSIS) and limiting factors analysis methods. Considering the natural endowments, infrastructure and construction conditions and economic and social affordability, 12 indexes were selected and analyzed. The results showed that high-standard prime farmland in Zhongjiang county could be divided to near-, mid- and long-term construction, and their area proportion of near, mid and long-term construction was 19.28%, 37.86% and 43.86%, respectively. Meanwhile, high-standard prime farmland in Zhongjiang county could be divided to three construction modes, namely slope modification construction mode, irrigation works construction mode and field roads construction mode, and their area proportion was 41.34%, 31.53% and 27.13%, respectively. This research provides a scientific basis for consolidation plan and construction programs of high-standard prime farmland in counties.
Number of references:29
Main heading:Farms
Controlled terms:Consolidation - Factor analysis - Land use - Zoning
Uncontrolled terms:Consolidation plan - Construction program - Construction requirements - Factors analysis - High-standard basic farmland - Mode - Mode partition - Sichuan province - Study areas - Technique for order preference by similarity to ideal solutions - Time sequences - Zhongjiang county
Classification code:403 Urban and Regional Planning and Development - 483 Soil Mechanics and Foundations - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 922.2 Mathematical Statistics
DOI:10.3969/j.issn.1002-6819.2012.22.034
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 39>

Accession number:20125115818527
Title:Optimal allocation of water resources for Jiangsu section of South-to-North Water Transfer East Line Project
Authors:Shi, Hansheng (1); Cheng, Jilin (1); Fang, Hongyuan (1); Lu, Xiaowei (2)
Author affiliation:(1) College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China; (2) Jiangsu Surveying and Design Institute of Water Resources Co., Ltd., Yangzhou 225009, China
Corresponding author:Cheng, J.(jlcheng@yzu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:76-81
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to solve the problem of water resources allocation in inter-basin water transfer project, this paper puts forward an optimal water resources allocation model for rivers-lakes-pumping stations system by combining simulation technology and discrete differential dynamic programming (DDDP) on the basis of the conventional water resources allocation. The minimum water shortage and pumping water volume was taken as comprehensive objective function, and, the inflow and water use in different hydrological year were simulated and calculated based on certain operation rules of lake in order to determine the maximum available water supply volume and transferred water volume of each section. A dynamic programming model for joint operation of multiple lakes was proposed, in which the minimum pumping water volume of the whole system was set as the objective function, the water volume to be pumped into the lake or discarded water from the lake was expressed as decision variable and was solved by means of DDDP. The JiangSu section of South-to-North Water Transfer Project was taken as a study case, the results showed that not only the water supply guaranteed rate of the whole system can be improved but also the equilibrium allocation of water supply volume among each section and each period can be realized. The maximum transferred water volume 1408, 1418 and 1270 million m3 out of JiangSu province in 50%, 75% and 95% hydrological year were calculated, respectively. And the model decreased the total pumping water volume 5134, 9487 and 2819 million m3 in 50%, 75% and 95% hydrological year, respectively, which can reduce the cost of the water supply system through optimal operation, and finally realize optimal joint allocation of local and transferred water resources.
Number of references:19
Main heading:Surface water resources
Controlled terms:Computer simulation - Lakes - Models - Optimization - Pumps - Resource allocation - Water resources - Water supply - Water supply systems
Uncontrolled terms:Available water - Conventional water resources - Decision variables - Differential dynamic programming - Dynamic programming model - Equilibrium allocation - Guaranteed rate - Hydrological years - Inter-basin water transfer - Jiangsu province - Joint allocation - Joint operations - Line project - Objective functions - Operation rules - Optimal allocation - Optimal operation - Resources allocation - Simulation - Simulation technologies - South to North Water Transfer Project - South-to-North Water Transfer - Study case - Water shortages - Water use - Water volumes
Classification code:912.3 Operations Research - 902.1 Engineering Graphics - 723.5 Computer Applications - 921.5 Optimization Techniques - 618.2 Pumps - 444.1 Surface Water - 444 Water Resources - 446.1 Water Supply Systems
DOI:10.3969/j.issn.1002-6819.2012.22.012
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 40>

Accession number:20125115818524
Title:Polar diagram angle-frequency representation and diagnosis for gear wear fault of gearbox
Authors:Jia, Jide (1); Zhang, Lingling (1); Zeng, Ruili (1); Jiang, Honghui (1); Xiao, Yunkui (1); Zhu, Zhongkui (2)
Author affiliation:(1) Department of Automobile Engineering, College of Military Transportation, Tianjin 300161, China; (2) School of Urban Rail Transportation, Soochow University, Suzhou 215021, China
Corresponding author:Jia, J.
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:22
Issue date:November 15, 2012
Publication year:2012
Pages:58-62
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:The gearbox gear wear tend to result in impulse response in vibration signals, and monitoring impulse response in the rotation cycle, which can achieve fault diagnosis. In order to improve monitoring and diagnosis effects by the visualization, distribution method of the polar digram angle frequency (DPDAF) was introduced in the study. Gearbox vibration signals were denoised by continuous wavelet transform, and then transformed into DPDAF, which can clearly exhibite the impulse response signal differences with the six rotation cycles in the different wear conditions. Six rotation cycle energy were extracted as the feature vectors of gearbox gear wear fault, which were used to train BP neural network for fault pattern recognition. Test results showed that applying DPDAF and BP neural network to gearbox gear wear fault diagnosis was feasible and effective. The results provide a reference for the engineering applications of the polar angle frequency representation in the gearbox condition monitoring and fault diagnosis.
Number of references:27
Main heading:Fault detection
Controlled terms:Condition monitoring - Impulse response - Neural networks - Pattern recognition - Transmissions
Uncontrolled terms:BP neural networks - Continuous Wavelet Transform - Engineering applications - Feature vectors - Gear wear - Gearbox condition monitoring - Gearbox vibration signal - Impulse response signals - Monitoring and diagnosis - Polar angles - Polar diagrams - Rotation cycle - Vibration signal - Wear condition
Classification code:723.4 Artificial Intelligence - 716 Telecommunication; Radar, Radio and Television - 706 Electric Transmission and Distribution - 603 Machine Tools - 602.2 Mechanical Transmissions - 422 Strength of Building Materials; Test Equipment and Methods - 408.1 Structural Design, General
DOI:10.3969/j.issn.1002-6819.2012.22.009
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

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