<RECORD 1>
Accession number:20121314899962
Title:Design of automobile cruise control system based on Matlab and fuzzy PID
Authors:Qiu, Chengqun (1); Liu, Chenglin (1); Shen, Fahua (1); Chen, Jie (1)
Author affiliation:(1) College of Physics and Electron, Yancheng Teachers University, Yancheng 224002, China
Corresponding author:Liu, C.(qcqqcq@126.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:197-202
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 cruise control system based on Matlab and fuzzy PID (proportional-integral-derivative) control for automobile was proposed and was composed of analog signal input device, electronic control unit of cruise control system, throttle actuators and so on. In order to improve accuracy and stability of automobile cruise, a self-adapted PID fuzzy control algorithm was proposed and the fuzzy rules and proportion factor of fuzzy output were optimized in this algorithm, in which the advantages of conventional fuzzy control not only was retained, but also performance of cruise control system was improved this algorithm. Vehicle (Shanghai Volkswagen Passat 1.8 MT) test results showed that when vehicle (Shanghai Volkswagen Passat 1.8 MT) cruised at constant speed 40, 60, 80, 100 km/h, stable time of the automobile cruise control system was at 38, 53, 65, 80 s, and overtake speed was at 0.5, 0.4, 1.2, 1.0 km/h, respectively. The system proposed in this paper eliminates the automobile error effectively with rapid response, keeps in small overstake speed and works stably, which meets the need of control for automobile cruise control system.
Number of references:21
Main heading:Automobiles
Controlled terms:Algorithms - Computer control - Control systems - Fuzzy control - MATLAB - Speed - Vehicles
Uncontrolled terms:Analog signals - Constant speed - Electronic control units - Fuzzy output - Fuzzy-PID - Proportion factor - Proportional integral derivatives - Rapid response - Stable time - Volkswagen
Classification code:931.1 Mechanics - 921 Mathematics - 731 Automatic Control Principles and Applications - 723.5 Computer Applications - 723 Computer Software, Data Handling and Applications - 662.1 Automobiles - 432 Highway Transportation
DOI:10.3969/j.issn.1002-6819.2012.06.032
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 2>
Accession number:20121314899938
Title:Virtual design of rigidity for valve train system in internal combustion engine
Authors:Li, Jia (1); Liu, Zhentao (1); Liu, Zhongmin (2); Zhang, Pengwei (1); Yu, Xiaoli (1)
Author affiliation:(1) Power Machinery and Vehicle Engineering Research Institute, Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China; (2) College of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
Corresponding author:Yu, X.(yuxl@zju.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:44-49
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 define the stiffness of the two-mass valve train model which is the key parameter of the valve train system, the finite element calculation was carried out by using different methods of compartmentalizing component based on the creation of the 3D models of every component of the valve train of WD615.The stiffness values of various valve train systems were calculated by using the simulation method mentioned above. After the calibration of the test system, the simulation results were tested by using the technique of laser measurement. The simulation and test result showed the reasonability and accuracy of the FEM method and the measurement error was limited to 5%. It coule be concluded that there was a quadratic polynomial increase between the valve train stiffness and the quality of the valve while the natural frequency of valve system waved between 30000 to 50000 times/min based on the statistical results. This research could provide the theory basis of developing the new valve train system.
Number of references:16
Main heading:Valves (mechanical)
Controlled terms:Finite element method - Internal combustion engines - Stiffness
Uncontrolled terms:3D models - Component based - FEM method - Finite element calculations - Internal combustion engines (ICE) - Key parameters - Laser measurements - Quadratic polynomial - Reasonability - Simulation methods - Stiffness values - Test systems - Valve systems - Valve train - Virtual design
Classification code:421 Strength of Building Materials; Mechanical Properties - 422 Strength of Building Materials; Test Equipment and Methods - 601.2 Machine Components - 612.1 Internal Combustion Engines, General - 921.6 Numerical Methods - 951 Materials Science
DOI:10.3969/j.issn.1002-6819.2012.06.008
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 3>
Accession number:20121314899932
Title:Structural optimization and experiment on fluid director of air-assisted sprayer
Authors:Song, Shuran (1); Xia, Houbing (2); Lu, Yuhua (2); Hong, Tiansheng (1); Ruan, Yaocan (2)
Author affiliation:(1) National Citrus Industry Technology Research System Machinery Laboratory, Guangzhou 510642, China; (2) College of Engineering, South China Agricultural University, Guangzhou 510642, China; (3) Key Laboratory of Key Technology on Agricultural Machine and Equipment, Ministry of Education, Guangzhou 510642, China; (4) Logistics Department, South China Agricultural University, Guangzhou 510642, China
Corresponding author:Hong, T.(tshong@scau.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:7-12
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 air field distribution and spray efficiency are influenced by the internal structure of an air-assisted sprayer. In this paper, computational simulation was applied to analyze effects of the distributor number on the internal wind flow field in an air duct. Effects of cylindrical, conical and semi-elliptical fluid director structures on the duct wind flow field outlet speed and pressure loss were simulated. The form and structure of fluid director were optimized to obtain high efficiency. A prototype machine was made and comparative analysis was conducted with the measured duct performance before and after oriented object installation. Results indicated that the proper amount of deflector was from four to five pieces. After fluid director was installed, power saving reached to 4.88% when the fan speed was at 2926.5 r/min. The installed deflectors were benefit for turning the rotating air flow to the axial air flow within the duct and generated pressure loss. The oriented object's structure had great effects on the duct pressure loss rate and outlet wind speed. A minimum pressure loss rate was obtained by using the semi-elliptical oriented object.
Number of references:20
Main heading:Air
Controlled terms:Agricultural machinery - Ducts - Efficiency - Flow fields - Structural optimization - Wind effects
Uncontrolled terms:Air ducts - Air flow - Air-assisted sprayer - Axial air flow - Comparative analysis - Computational simulation - Director structure - Fan speed - Field distribution - Internal structure - Minimum pressure - Power savings - Pressure loss - Prototype machine - Wind flow - Wind speed
Classification code:921.5 Optimization Techniques - 913.1 Production Engineering - 821.1 Agricultural Machinery and Equipment - 804 Chemical Products Generally - 641.2 Heat Transfer - 631.1 Fluid Flow, General - 443.1 Atmospheric Properties
DOI:10.3969/j.issn.1002-6819.2012.06.002
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 4>
Accession number:20121314899973
Title:Characterization method of fruit decay procedure using electronic nose system
Authors:Hui, Guohua (1); Li, Peng (1); Wu, Yuling (1); Zhu, Linshan (1)
Author affiliation:(1) College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310035, China
Corresponding author:Hui, G.(ghui@zjgsu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:264-268
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 investigate a characterization method for fruit decay procedures, experiments of decay procedures on apple, pear, peach, plum, and grape decay procedure using electronic nose system were conducted. The decay degree feature was extracted by non-linear stochastic resonance technique. The feature gas amount during apple decay procedure kept going up, while the feature gas amount of pear, peach, plum, and grape reached their maximums, and then declined. The results showed that the electronic nose system characterized fruit decay procedure successfully, which provided a new way for fruit decay characterization.
Number of references:20
Main heading:Fruits
Controlled terms:Artificial organs - Characterization - Circuit resonance - Decay (organic) - Magnetic resonance - Sensory aids
Uncontrolled terms:Characterization methods - Decay - Electronic NOSE - Electronic nose systems - Stochastic resonances
Classification code:951 Materials Science - 821.4 Agricultural Products - 811.2 Wood and Wood Products - 703.1.1 Electric Network Analysis - 701.2 Magnetism: Basic Concepts and Phenomena - 462.4 Prosthetics - 462.1 Biomedical Equipment, General
DOI:10.3969/j.issn.1002-6819.2012.06.043
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 5>
Accession number:20121314899971
Title:Type classification and standard of rural housing land
Authors:He, Wenchao (1); Shi, Xueyi (1); Wen, Shenghuan (1); Shao, Zehui (1)
Author affiliation:(1) College of Land Science and Technology, China University of Geosciences, Beijing 100083, China
Corresponding author:Shi, X.(shixueyi60@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:253-258
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:Establishing a set of appropriate standard for rural residential land use of meeting most farmers' production, life and development needs is the urgent requirement of developing new countryside construction, land increase or decrease hook and land regulation planning. In this paper, 170 households were categorized into three classifications by using K-Means Cluster method after the statistical analysis of survey data. Then, based on the surveyed subjects' housing land use and their production and economical status, standards for different types of rural housing land use according to national and provincial specifications and regulatory norms were put forward. Results showed that the households could be divided into labor type, semi-farming type and farming type, and the land use standards for each type were 42-45 m<sup>2</sup> per person, 48-50 m<sup>2 </sup>per person and 52-55 m<sup>2</sup> per person respectively. This research provides a reference to investigate the residential land use standards accord with the local condition and determine the size and spatial layout of the same type of urban and rural construction land space.
Number of references:19
Main heading:Standards
Controlled terms:Cluster analysis - Housing - Land use - Rural areas - Surveys
Uncontrolled terms:Cluster method - Development needs - K-means - Local conditions - New countrysides - Rural constructions - Rural housing - Rural housing land - Spatial layout - Survey data - Zezhou county
Classification code:922 Statistical Methods - 902.2 Codes and Standards - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 723 Computer Software, Data Handling and Applications - 405.3 Surveying - 403.1 Urban Planning and Development - 403 Urban and Regional Planning and Development
DOI:10.3969/j.issn.1002-6819.2012.06.041
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 6>
Accession number:20121314899946
Title:Effect of controlled irrigation on accumulation of heavy metal Cd, Cr in soil-plant system in rice paddy
Authors:Peng, Shizhang (1); Qiao, Zhenfang (1); Xu, Junzeng (1)
Author affiliation:(1) State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China; (2) College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
Corresponding author:Xu, J.(xjz481@hhu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:94-99
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 reveal the impact of irrigation management on heavy metals Cd, Cr inputs and distribution and enrichment of Cd, Cr in rice plants, field experiments were carried out to determine contents of heavy metal Cd, Cr in soil-plant system in rice paddy. The results showed that controlled irrigation mode can reduce seasonal irrigation inputs of heavy metals Cd, Cr by 60.8% and 59.8% respectively, compared with traditional irrigation. Controlled irrigation leaded to significant change in accumulation of Cd, Cr in the aboveground part, and increased accumulation of Cd and Cr by 29.5% and 5.4% respectively, compared with traditional irrigation. Cd and Cr were mostly stored in the root of rice, with only a small part of them migrating to the aboveground. Enrichment coefficients of Cd and Cr in roots of rice with controlled irrigation paddy were higher than those with the traditional irrigation. Controlled irrigation enhanced Cd and Cr migration ability to the rice plants, and migration of Cd and Cr to the aboveground. Therefore, controlled irrigation can decrease input risk and soil cumulative risk of Cd and Cr in rice paddy, but it also can increase rice absorption of Cd. Further study on soil heavy metals pollution remediation should be carried out.
Number of references:24
Main heading:Irrigation
Controlled terms:Absorption - Bioaccumulation - Blast enrichment - Heavy metals - Soil pollution - Soils
Uncontrolled terms:Enrichment coefficients - Field experiment - Heavy metals pollution - Irrigation management - Migration ability - Rice - Rice paddy - Rice plants - Seasonal irrigation - Soil plant systems - Traditional irrigation
Classification code:931.2 Physical Properties of Gases, Liquids and Solids - 821.3 Agricultural Methods - 533.2 Metal Refining - 531 Metallurgy and Metallography - 483.1 Soils and Soil Mechanics - 454 Environmental Engineering - 453 Water Pollution
DOI:10.3969/j.issn.1002-6819.2012.06.016
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 7>
Accession number:20121314899958
Title:Estimating models of rice agronomic parameters using 3CCD digital camera
Authors:Yang, Yanqiong (1); Luo, Xiwen (1); Huang, Nongrong (2)
Author affiliation:(1) College of Engineering, South China Agriculture University, Guangzhou 510642, China; (2) Rice Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510642, China
Corresponding author:Luo, X.
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:174-178
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 estimation of rice agronomic parameters is an important basis for regulating rice growth and forecast rice yield. Taking paddyfield of Rice Research Institute, Guangdong Academy of Agricultural Sciences as study case, estimation of rice leaf area index, biomass, chlorophyll contents, leaf length, leaf width, height, yield, etc were studied by 3CCD digital camera according to plant reflectance traits. The results showed that the 3CCD digital camera could not be suitable for estimating rice agronomic parameters at tillering stage, leaf area index estimation was the best at idiophase, and the estimation of biomass, chlorophyll contents, yield was better at heading stage. The 3CCD digital camera can't be used in the estimation of rice height, leaf length, leaf width etc external characteristics of paddyfield. The study provides a foundation for estimating rice yield using CCD digital cameras.
Number of references:17
Main heading:Parameter estimation
Controlled terms:Agronomy - Digital cameras - Estimation - Reflection - Vegetation - Video cameras
Uncontrolled terms:Agricultural science - Agronomic parameters - Chlorophyll contents - External characteristic - Leaf Area Index - Leaf length - Parameters estimation - Plant reflectance - Research institutes - Rice - Rice leaf - Rice yield - Study case - Vegetation indices
Classification code:711 Electromagnetic Waves - 731.1 Control Systems - 742.2 Photographic Equipment - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 821.3 Agricultural Methods - 921 Mathematics
DOI:10.3969/j.issn.1002-6819.2012.06.028
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 8>
Accession number:20121314899959
Title:Measurement of plant leaf area based on image segmentation of color channel similarity
Authors:Han, Dianyuan (1); Huang, Xinyuan (1); Fu, Hui (1)
Author affiliation:(1) School of Information Science and Technology, Beijing Forestry University, Beijing 100083, China; (2) Department of Computer Engineering, Weifang University, Weifang 261061, China
Corresponding author:Huang, X.(hxy@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:6
Issue date:March 15, 2012
Publication year:2012
Pages:179-183
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 measure plant leaf area quickly and accurately, a method of plant leaf area measurement based on color channel similarity image segmentation was put forward. In this paper, plant leaf area was separated by using the color channel similarity and an auto adaptive threshold. After the pixels of the leaf area and the referenced rectangle were counted, the leaf area was calculated. Experiments showed that this method was more accurate and had a strong robustness to the shadow and piebald, and the misclassification error was only 1.23%. So this method greatly improves the accuracy of measurement and is a practical method of plant leaf area measurement by taking pictures and can be embedded in mobile devices such as smart mobile phones.
Number of references:22
Main heading:Color
Controlled terms:Geodesy - Image processing - Image segmentation - Measurements - Mobile devices - Surveying
Uncontrolled terms:Adaptive thresholds - Color channels - Leaf area - Misclassification error - Plant leaf - Practical method
Classification code:943 Mechanical and Miscellaneous Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 941 Acoustical and Optical Measuring Instruments - 944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 741.1 Light/Optics - 716 Telecommunication; Radar, Radio and Television - 405.3 Surveying - 741 Light, Optics and Optical Devices
DOI:10.3969/j.issn.1002-6819.2012.06.029
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 9>
Accession number:20121314899957
Title:Estimation on regional maize yield based on assimilation of remote sensing data and crop growth model
Authors:Jin, Hua'an (1); Wang, Jindi (1); Bo, Yanchen (1); Chen, Guifen (2); Xue, Huazhu (1)
Author affiliation:(1) State Key Laboratory of Remote Sensing Science, School of Geography, Beijing Normal University, Beijing 100875, China; (2) College of Computer Science and Technology, Jilin Agricultural University, Changchun, 130118, China
Corresponding author:Wang, J.(wangjd@bnu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:162-173
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 apply time-series variation information of reflectance spectrum at direction of crop canopy which was observed by remote sensing in crop growing stages to estimate the regional corn yield, a practical scheme to assimilate time-series remote sensing data and the CERES-Maize (crop environment resource synthesis-Maize) growth model coupled with the canopy reflectance model SAIL(scattering by arbitrarily inclined leaves) through leaf area index for regional maize yield estimation was addressed based on the time-series MODIS(moderate resolution imaging spectroradiometer) and high spatial resolution TM observation data. The proposed scheme was applied to Yushu city located in Northeast China. The spatial distribution of maize per unit yield was determined by applying the SCE-UA (shuffled complex evolution method developed at the University of Arizona) optimization algorithm to the maize yield estimation, and the gross maize yield in Yushu city was estimated through per unit yield multiplied by maize planting area which was extracted using remote sensing data. The results indicated that comparing to the statistical data of maize yield, the estimation errors of the total maize yield estimation by using remote sensing data assimilation were 9.15%, 14.99% and 8.97% in 2007, 2008 and 2009 respectively. Comparing to those only running the CERES-Maize model, the errors of the total maize yield estimation by using remote sensing data assimilation decreased by 7.49%, 1.21% and 5.23% in 2007, 2008 and 2009 respectively. The maize yield estimated by MODIS and TM data revealed its spatial heterogeneity. The expression capability of maize growth condition and yield variation was analyzed using time-series remote sensing data in this paper. The greater time-series NDVI in the same year was, the higher the maize yield was. The inter-annual variations of remote sensing observations mirrored the inter-annual variations of maize yield gap by using the data assimilation method. This scheme for estimating corn yield can provide a reference for regional corn yield research based on further combining multi-source remote sensing data, reflectance spectrum of crop canopy with crop growth model.
Number of references:26
Main heading:Data processing
Controlled terms:Algorithms - Crops - Errors - Estimation - Models - Radiometers - Reflection - Remote sensing - Satellite imagery
Uncontrolled terms:Canopy reflectance model - CERES maizes - Corn yields - Crop canopy - Crop growing stages - Crop growth model - Data assimilation - Data assimilation methods - Estimation errors - Growth conditions - Growth models - High spatial resolution - Interannual variation - Leaf Area Index - Maize yield - Moderate resolution imaging spectroradiometer - Multisources - Northeast China - Observation data - Optimization algorithms - Per unit - Practical schemes - Reflectance spectrum - Remote sensing data - Remote sensing data assimilations - Shuffled Complex Evolution - Spatial heterogeneity - Statistical datas - University of Arizona - Yield estimation
Classification code:921 Mathematics - 902.1 Engineering Graphics - 821.4 Agricultural Products - 944.7 Radiation Measuring Instruments - 731.1 Control Systems - 711 Electromagnetic Waves - 443 Meteorology - 723.2 Data Processing and Image Processing
DOI:10.3969/j.issn.1002-6819.2012.06.027
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 10>
Accession number:20121314899950
Title:Characteristics of soil nitrogen loss under different intense rainfalls in Yimeng mountainous area
Authors:Jing, Guanghua (1); Yu, Xingxiu (1); Liu, Qianjin (1); Li, Zhenwei (1)
Author affiliation:(1) Shandong Key Laboratory of Soil Conservation and Environmental Protection, Institute of Soil and Water Conservation and Environmental Protection, Linyi University, Linyi 276005, China; (2) Institute of Population Resource and Environment, Shandong Normal University, Jinan 250014, China
Corresponding author:Yu, X.(yuxingxiu@lyu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:120-125
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 the loss characteristics of different forms of nitrogen under different natural rainfall intensities, a fixed-point experiment was conducted in Meng Lianggu basin, a typical watershed in the area of YiHe upstream located in Yimeng Mountainous area. The processes of rainfall and runoff in 2010 were observed and three typical rainfall events including the first rainstorm, a heavy rain and a heavy rainstorm were selected. Results showed that different forms of nitrogen contents presented the same increasing tend except for particulate nitrogen during the first rainstorm event of the flood season. In the heavy rain process, total nitrogen content reached the maximum before the runoff peak and dissolved nitrogen and then dissolved nitrate nitrogen contents reached the maximum. During the heavy rainstorm, total nitrogen and particulate nitrogen contents reached rapidly the maximum before the runoff peak and then declined quickly. The discharge weighted concentration of total nitrogen and particulate nitrogen increased with the rainfall intensity in the order of heavy rain<rainstorm <heavy rainstorm. Dissolved nitrogen accounted for 49.9265%-85.292% of total nitrogen loss concentration and dissolved nitrate nitrogen played a dominated role in dissolved nitrogen. Furthermore, the average loss rates of nitrogen and sediment were both declined with the rainfall intensity decreasing in the order of heavy rainstorm>rainstorm>heavy rain. The research could provide a basis for the protection of water environment and the control of non-point pollution of typical watersheds in Yimeng Mountainous area.
Number of references:25
Main heading:Rain
Controlled terms:Anoxic sediments - Dissolution - Losses - Nitrogen - Runoff - Storms - Water pollution control
Uncontrolled terms:Average loss - Dissolved nitrogen - Flood season - Heavy rains - Loss characteristics - Mountainous area - Nitrate nitrogen - Nitrogen content - Nonpoint pollutions - Rainfall event - Rainfall intensity - Soil nitrogen - Total nitrogen - Total nitrogen content - Water environments
Classification code:911.2 Industrial Economics - 804 Chemical Products Generally - 802.3 Chemical Operations - 483 Soil Mechanics and Foundations - 453.2 Water Pollution Control - 444.1 Surface Water - 443.3 Precipitation
DOI:10.3969/j.issn.1002-6819.2012.06.020
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 11>
Accession number:20121314899956
Title:Evaluation to ecological water requirement of dry land system based on ecological function zones in Yanhe watershed
Authors:Wang, Lixia (1); Ren, Zhaoxia (1); Ren, Zhiyuan (2); Ma, Chaoqun (1)
Author affiliation:(1) College of Earth Science and Resources, Chang'an University, Xi'an 710054, China; (2) College of Tourism and Environmental Sciences, Shaanxi Normal University, Xi'an 710062, China
Corresponding author:Wang, L.(wlx333@sina.com.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:156-161
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 this research, by taking dry land system of Yanhe watershed as an example, we selected the index with ecology and hydrology meaning and applied the RS, GIS and GPS technologies to establish the ecological function zones. At the same time, we assessed and analyzed the ecological water requirement and its distribution characteristics at the scales of vegetation-soil landscapes and ecological function zones. The results showed that Yanhe watershed could be divided into five ecological zones, which were sand fixation zone, drought defense zone, land and water maintenance zone, farmland planting zone and vegetation protection zone, respectively. The ecological water requirement of forest-cohesive loam was the most amount with 502.31 mm/a; while that of grassland-sandy loam was the least amount with 300.01 mm/a. The ecological water requirement of vegetation protection zone was the most amount with 357.72 mm/a; while that of drought defense zone was the least amount with 304.73 mm/a. This research offers scientific references for optimal allocation and sustainable utilization of land-water resources, and it is significant for ecosystem management.
Number of references:23
Main heading:Water resources
Controlled terms:Drought - Ecology - Functional analysis - Landforms - Vegetation - Water - Watersheds
Uncontrolled terms:Distribution characteristics - Dry land - Ecological function zones - Ecological functions - Ecological water requirements - Ecological zones - Ecosystem management - GPS technologies - Maintenance zones - Optimal allocation - Sand fixation - Sustainable utilization - Vegetation protection
Classification code:444 Water Resources - 444.1 Surface Water - 454.3 Ecology and Ecosystems - 481.1 Geology - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 921 Mathematics
DOI:10.3969/j.issn.1002-6819.2012.06.026
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 12>
Accession number:20121314899963
Title:Effects of tillage practices on soil carbon storage and greenhouse gas emission of farmland in North China
Authors:Zhang, Mingyuan (1); Wei, Yanhua (1); Kong, Fanlei (1); Chen, Fu (1); Zhang, Hailin (1)
Author affiliation:(1) Key Laboratory of Farming System, Ministry of Agriculture of the People's Republic of China, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
Corresponding author:Zhang, H.(hailin@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:6
Issue date:March 15, 2012
Publication year:2012
Pages:203-209
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:Distribution of soil organic carbon in different soil layer can be transformed by tillage practices, and then soil carbon storage was changed. The four indices of soil organic carbon (SOC), soil carbon density (SCD), soil respiration (SR) and biomass carbon (BC) were selected to verify the adaptability of DNDC model in North China based on model adaptation and then the model was used to simulate local dynamic change of soil carbon storage (SCS) and characteristics of greenhouse gas emission. The result showed that there was a high similarity between simulated values and observed values and the model proposed was suitable to apply to the simulation research of soil organic carbon for winter wheat-summer corn in North China. SOC and SCS simulated by the model increased from 2001-2010, and simulated data in the next 100 years showed that SOC with rotary tillage (RT), conventional tillage (CT) and no-tillage (NT) showed a severe rising tendency in the first 15 years, and rising tendency of NT could sustain for 40 years. By comparing changes of soil carbon storage for 100 years between each treatment, it was found that SCS values with CT were the highest in the first 20 years and SCS values with NT was the highest after first 20 years. The sequence of global warming potential (GWP) for each treatment was CT>RT>NT. The results showed that DNDC model could work well for winter wheat-summer corn in North China, and NT was beneficial to increase SCS and decrease GWP of farmland in the long run. It provides a reference for fixing carbon and reducing discharge of winter wheat-summer corn in North China.
Number of references:21
Main heading:Geologic models
Controlled terms:Agricultural machinery - Carbon - Computer simulation - Crops - Gas emissions - Global warming - Greenhouse gases - Organic carbon - Soils
Uncontrolled terms:Carbon storage - Conventional tillage - Global warming potential - Local dynamics - Model Adaptation - No tillage - North China - Simulated data - Simulation research - Soil carbon - Soil carbon storage - Soil layer - Soil organic carbon - Soil respiration - Tillage practices
Classification code:821.4 Agricultural Products - 821.1 Agricultural Machinery and Equipment - 804.1 Organic Compounds - 804 Chemical Products Generally - 723.5 Computer Applications - 483.1 Soils and Soil Mechanics - 481.1 Geology - 451.1 Air Pollution Sources - 451 Air Pollution
DOI:10.3969/j.issn.1002-6819.2012.06.033
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 13>
Accession number:20121314899951
Title:Adaptability analysis on soil erodibility models in typical thin layer black soil area of Northeast China
Authors:Wang, Bin (1); Zheng, Fenli (1); Wang, Yuxi (3)
Author affiliation:(1) College of Resources and Environment, Northwest Agriculture and Forestry University, Yangling, 712100, China; (2) State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, 712100, China; (3) Institute of Soil and Water Conservation of Heilongjiang Province, Harbin, 150400, China
Corresponding author:Zheng, F.(flzh@ms.iswc.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:126-131
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:Soil erodibility is a crucial parameter in soil erosion prediction and evaluation on environmental effects. The typical eroded black soil area of Northeast China, the Binzhou River Basin, was taken as the research area. In order to evaluate the applicability of each K value calculating method in the typical eroded black soil area, the very fine sand content transform model (VFS model) in RUSLE2 (revised universal soil loss equation) was calibrated, and differences among K value calculating methods of EPIC (erosion productivity impact calculator), USLE (universal soil loss equation) and RUSLE2 were discussed respectively. Results showed that the VFS model in RUSLE2 underestimated 22.5% of the very fine sand content, compared to the observed value. Therefore, a revised VFS model was built based on the measured data, and the accuracy of very fine sand content which was calculated by the model improved by 95%. Furthermore, RULSE2 was the most appropriate method for K value calculation, in the typical eroded black soil area. EPIC and USLE models overestimated the K value, but they can still be applied in the typical thin layer black soil region when they were calibrated by the revised K value estimators. The results provides scientific basis to support soil erosion quantification and soil quality risk assessment in the typical thin layer black soil region and similar areas.
Number of references:27
Main heading:Geologic models
Controlled terms:Erosion - Models - Sand - Sediment transport - Soils
Uncontrolled terms:Contents - Erodibility - Fine sand - K value calculating method - Region of northeast chinas
Classification code:407 Maritime and Port Structures; Rivers and Other Waterways - 481.1 Geology - 483 Soil Mechanics and Foundations - 483.1 Soils and Soil Mechanics - 902.1 Engineering Graphics
DOI:10.3969/j.issn.1002-6819.2012.06.021
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 14>
Accession number:20121314899935
Title:Performance analysis and experiment on operation process of plant lifting device in 4HLB-2 type peanut combine harvester
Authors:Hu, Zhichao (1); Wang, Hai'ou (1); Peng, Baoliang (1); Chen, Youqing (1); Wu, Feng (1); Xie, Huanxiong (1)
Author affiliation:(1) Nanjing Research Institute of Agricultural Mechanization, Ministry of Agriculture, Nanjing 210014, China
Corresponding author:Hu, Z.(nfzhongzi@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:26-31
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 operation process and performance of plant lifting of 4HLB-2-type peanut combine harvester, the motion analysis of the plant lifting device was carried out to explore the influence of motion parameters and location configuration parameters of all parts on plant lifting effect, and the field experimental verification was performed subsequently. According to the motion analysis, when the design parameters of vine uprearing device obliquity was 80°, clamping chain obliquity was 35°, vine uprearing speed ratio was 1.5, chain speed ratio was 1.2 and so on, peanut plant was nearly perpendicular with the clamping chain, and the pulling force of clamping chain was nearly directed in up-vertical orientation. Based on the analysis of the peanut vine uprearing motion process, the calculation methods of the vine uprearing times and the maximum active uperaring fingers for individual peanut plant were determined, and the separation distance of uprearing fingers optimized was 150 mm. The theoretical analysis also involved the influence of the location relation of vine uprearing device, digging shovel and clamping chain on the peanut plant lifting performance. And the main location parameters in the side view of the three parts were determined. Field tests showed that the motion parameters and location configuration of all parts can meet the performance requirements of peanut plant lifting, and the practical process and status of plant lifting were in agreement with the results of theoretical analysis. This paper provides a reference for improvement of structural design and optimization of working parameters in same type device.
Number of references:15
Main heading:Oilseeds
Controlled terms:Equipment - Experiments - Harvesters - Kinetic parameters - Optimization - Structural design
Uncontrolled terms:Calculation methods - Combine harvesters - Configuration parameters - Design and optimization - Design parameters - Digging shovels - Experimental verification - Field test - Lifting devices - Location parameters - Motion analysis - Motion parameters - Operation process - Peanut - Performance analysis - Performance requirements - Practical process - Pulling force - Separation distances - Side view - Speed ratio - Working parameters
Classification code:931 Classical Physics; Quantum Theory; Relativity - 921.5 Optimization Techniques - 901.3 Engineering Research - 901 Engineering Profession - 821.4 Agricultural Products - 821.1 Agricultural Machinery and Equipment - 408.1 Structural Design, General
DOI:10.3969/j.issn.1002-6819.2012.06.005
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 15>
Accession number:20121314899945
Title:Numerical simulation of root water uptake for grape in extremely arid region
Authors:Su, Lijun (1); Wang, Quanjiu (1); Bai, Yungang (2); Zeng, Chen (3); Nan, Qingwei (1); Lu, Zhenlin (2)
Author affiliation:(1) Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an 710054, China; (2) Xinjiang Institute of Water Resources and Hydropower Research, Urumchi 830049, China; (3) Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institutes of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China
Corresponding author:Wang, Q.(wquanjiu@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:88-93
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 researches about the root distributions of mature grape, the characteristics of root water uptake and the laws of water consumption, it can be provided technical support for formulating the optimum irrigation system, proposing reasonable water management pattern and creating technical system of high-efficiency utilization of water. Based on analyzing the characteristic of water uptake and the measured data of the grape root distribution under condition of irrigation, a meshless numerical simulation model for one-dimensional water flow in unsaturated soils and one-dimensional root distribution function of grape were introduced in this paper. Further, the root distribution function and the other empirical root distribution functions were applied to numerical simulation model to demonstrate the appropriateness. According to the comparison between the results of dynamic simulation and data of field experiment, it shows that the simulated values of fitting root distribution, exponential root distribution, linear root distribution and piecewise root distribution are coincide well with measured values, and all of the relative errors are below 1%. However, compared with other root distribution functions, the error of exponential root distribution is larger. Therefore the fitting root distribution and the meshless numerical model can simulate the root water uptake of grape and the soil water movement in extremely arid region well. Moreover, under the condition of the shortage of the field root length distribution, linear root distribution and piecewise root distribution can be used to describe the practical root distribution of grape, and provide reference for using one-dimensional simple root distribution model to analyze the characteristic of grape water uptake under irrigation condition.
Number of references:21
Main heading:Fruits
Controlled terms:Arid regions - Computer simulation - Distribution functions - Irrigation - Models - Numerical methods - Soil moisture - Water management - Water supply
Uncontrolled terms:Field experiment - Irrigation systems - Management pattern - Measured data - Mesh-less methods - Meshless - Numerical simulation models - Piece-wise - Relative errors - Root distribution - Root length - Root-water uptake - Simple root - Soil water movement - Technical support - Technical systems - Unsaturated soil - Water consumption - Water flows - Water uptake
Classification code:922.1 Probability Theory - 921.6 Numerical Methods - 902.1 Engineering Graphics - 821.4 Agricultural Products - 821.3 Agricultural Methods - 723.5 Computer Applications - 483.1 Soils and Soil Mechanics - 446.1 Water Supply Systems - 446 Waterworks - 444 Water Resources - 443 Meteorology
DOI:10.3969/j.issn.1002-6819.2012.06.015
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 16>
Accession number:20121314899972
Title:Detection of urea in milk using two-dimensional correlation spectroscopy and partial least square method
Authors:Yang, Renjie (1); Liu, Rong (1); Xu, Kexin (1)
Author affiliation:(1) State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China; (2) Department of Electromechanical Engineering, Tianjin Agricultural University, Tianjin 300384, China
Corresponding author:Liu, R.(rongliu@tju.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:259-263
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 the detection and quantification of urea in milk, pure milk samples and 40 adulterated milk samples added different contents of urea were prepared. Then 2D correlation (NIR-NIR, IR-IR, NIR-IR) spectroscopy under the perturbation of adulteration concentration was calculated and the spectra in the range of 4200-4800 cm<sup>-1</sup> and 1400-1704 cm<sup>-1</sup> were selected to construct the partial least square (PLS) calibration model, respectively. The PLS calibration model showed 4200-4800 cm<sup>-1</sup> was the better range for calibration performance and the root mean square errors of cross validation (RMSECV) of the model was 0.266 g/L. When using this model for predicting the urea contents in prediction set, the root mean square errors of prediction (RMSEP) was 0.219 g/L and the coefficient correlation of actual values and predicted values was 0.999, which means the model has good prediction ability. The method can be used for a correct discrimination on whether the milk is adulterated and provides a new and cost-effective alternative to test the adulteration of milk.
Number of references:21
Main heading:Metabolism
Controlled terms:Calibration - Drug products - Forecasting - Infrared devices - Infrared spectroscopy - Mean square error - Models - Urea
Uncontrolled terms:2D correlation - Adulerated milk - Calibration model - Coefficient correlations - Cross validation - Milk sample - Partial least square (PLS) - Partial least square methods - PLS calibration - Root mean square errors - Two-dimensional correlation spectroscopy
Classification code:943 Mechanical and Miscellaneous Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 941.4 Optical Variables Measurements - 941 Acoustical and Optical Measuring Instruments - 921 Mathematics - 944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 902.1 Engineering Graphics - 741.3 Optical Devices and Systems - 741.1 Light/Optics - 731.1 Control Systems - 461.9 Biology - 804.1 Organic Compounds
DOI:10.3969/j.issn.1002-6819.2012.06.042
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 17>
Accession number:20121314899969
Title:Benefits analysis and evaluation on land consolidation planning in Heilongjiang province
Authors:Huang, Huiling (1); Wu, Cifang (1); Zhang, Shouzhong (2)
Author affiliation:(1) Institute of Land Science and Real Estate, Zhejiang University, Hangzhou 310029, China; (2) Architectural Engineering Institute, Heilongjiang Institute of Science and Technology, Harbin 150027, China
Corresponding author:Huang, H.(dnhhl@sina.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:240-246
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:Benefits analysis and evaluation on land consolidation planning is a very important part of land consolidation planning. Based on the concept of benefits analysis and evaluation on land consolidation planning, a three-level system "national target-special-purpose target-index" of analysis and evaluation was established by using analytic hierarchy process (AHP). Statistical forecast method, analogy analysis method and expert investigation method were used to analyze and evaluate on land consolidation planning's benefits of Heilongjiang province. Results indicated that land consolidation planning of Heilongjiang province had extremely significant comprehensive effects on achieving the protection of economics and arable land, implementing the most severe protection policy for cultivated land and the most severe economical utilizing land policy, and promoting the construction of the new socialist countryside and overall planning development of urban and rural. The statistical forecast method, analogy analysis method and expert investigation method could be combined with each other and could be used to benefits analysis of planning. The idea and method proposed in this paper provide a reference for other scholars to study benefits of regional land consolidation planning.
Number of references:20
Main heading:Land use
Controlled terms:Analytic hierarchy process - Economics - Planning
Uncontrolled terms:Analysis and evaluation - Analysis method - Arable land - Benefits analysis - Comprehensive effect - Cultivated lands - Forecast method - Heilongjiang province - Protection policy - Three level systems
Classification code:403 Urban and Regional Planning and Development - 921 Mathematics - 961 Systems Science - 971 Social Sciences
DOI:10.3969/j.issn.1002-6819.2012.06.039
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 18>
Accession number:20121314899933
Title:Simulation analysis on characteristics of droplet deposition base on CFD discrete phase model
Authors:Sun, Guoxiang (1); Wang, Xiaochan (1); Ding, Weimin (1); Zhang, Yu (1)
Author affiliation:(1) College of Engineering, Nanjing Agricultural University, Nanjing 210031, China; (2) Jiangsu Key Laboratory for Intelligent Agricultural Equipment, Nanjing 210031, China
Corresponding author:Wang, X.(wright7878@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:6
Issue date:March 15, 2012
Publication year:2012
Pages:13-19
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 the effect on the droplet drifting made by the airflow, the discrete phase particle tracking technology was used to get the characteristics of the droplet deposition in different spraying conditions, based on the CFD theory. The virtual cube was in the dimension of 3 m×2 m×2 m with a sprayer nozzle at the top( the geometrical center of abaxial surface for cube). The characteristics of droplet deposition were simulated with the optimized boundary conditions at the different height of deposition, ranging from 0.25 to 2 m, and at the different speed of the wind, from 0 to 3 m/s. The results showed that the distribution of the droplets were different at the different speed of the wind. The droplet deposition decreased when both the height of the droplet section and the speed of the wind increased, of which the maximum was 100%(at the height of 0.25 m and the speed of 0), and the minimum was 7.2%(at the height of 2 m and the speed of 3 m/s). The maximum and minimum of droplet deposition ratio was 79.07%, 3.98%, respectively, and prediction models of the droplet deposition and the droplet ratio were established based on technology mentioned in this paper, which provides a reference for precise pesticide application.
Number of references:22
Main heading:Spray nozzles
Controlled terms:Computational fluid dynamics - Computer simulation - Deposition - Drops - Mathematical models - Models - Speed - Spraying
Uncontrolled terms:Different heights - Different speed - Discrete phase - Discrete phase model - Distribution characteristics - Droplet deposition - Prediction model - Simulation analysis - Sprayer nozzle
Classification code:631.1 Fluid Flow, General - 723.5 Computer Applications - 813.1 Coating Techniques - 902.1 Engineering Graphics - 921 Mathematics - 931.1 Mechanics
DOI:10.3969/j.issn.1002-6819.2012.06.003
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 19>
Accession number:20121314899937
Title:Parameters optimization of energy storage element in parallel-series hydraulic hybrid power system
Authors:Du, Jiuyu (1); Wang, Hewu (1); Huang, Haiyan (1)
Author affiliation:(1) State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
Corresponding author:Du, J.(dujiuyu@tsinghua.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:39-43
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 achieve fuel economy optimum of hybrid power system designed with dual-planetary architecture, factors of energy saving effects were investigated for configuration scheme of parallel-series hybrid power system. The results showed that by energy storage mechanism and matching character for the objective of improving system fuel economy the operation status of vehicle were determined, and then design method optimized for energy storage element based on usual working conditions was proposed with fuel economy as a target, the optimization algorithm model was set up to optimize the parameters of energy storage system. The methods were verified by some classic duty cycle and combined with mathematic modeling and simulation, and it was concluded that the fuel economy of hybrid power system was improved by 4%. This research provides a reference for further optimization of more parameters and application of advanced control algorithm.
Number of references:18
Main heading:Energy storage
Controlled terms:Algorithms - Computer simulation - Fuel economy - Mechanisms - Optimization - Systems analysis - Vehicles
Uncontrolled terms:Advanced control algorithms - Design method - Duty cycles - Energy storage systems - Energy-saving effect - Fuel saving ratio - Hybrid power systems - Hydraulic hybrids - Improving systems - Mathematic modeling - Operation status - Optimization algorithms - Parallel-series hydraulic hybrid power system - Parameters matching - Parameters optimization - Storage elements - Storage mechanism - Working conditions
Classification code:961 Systems Science - 921.5 Optimization Techniques - 921 Mathematics - 723.5 Computer Applications - 723 Computer Software, Data Handling and Applications - 702 Electric Batteries and Fuel Cells - 601.3 Mechanisms - 521 Fuel Combustion and Flame Research - 432 Highway Transportation
DOI:10.3969/j.issn.1002-6819.2012.06.007
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 20>
Accession number:20121314899966
Title:Investigation on large and medium scale biogas plants and biological properties of digestate in Jiangsu province
Authors:Ye, Xiaomei (1); Chang, Zhizhou (1); Qian, Yuting (1); Pan, Juncai (1); Zhu, Jin (1)
Author affiliation:(1) Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Corresponding author:Chang, Z.(czhizhou@hotmail.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:222-227
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:Biogas plant construction has rapid development in recent years. However, studies on its operation and management were few, especially for large and medium-sized ones. To explore the problems existing in operation and management, a field investigation on 21 plants of large and medium-sized biogas was carried out in intensive pig and dairy farms in Jiangsu province. The investigation included the operation status of the plants and the raw materials and digestion slurry was sampled to analyze the content of COD, residual biogas production and the count of fecal coliform. Results showed that the design and construction of all the biogas plants was performed by professional company with well-appointed facilities, whereas the biogas volume produced and the utilization of biogas and digestion slurry were low. The main raw materials for anaerobic digestion were waste water from pig and dairy farms, with low content of total solid (i. e., TS < 3%). Most raw materials could not be digested completely. COD contents from 62% digestion slurry samples were more than 5000 mg/L, which caused appreciable quantities of methane produced from digestion slurry. Twelve digestion slurry samples could produce methane more than100 mL/L at 35°C. Anaerobic digestion could significantly reduce the survival of fecal coliform, reaching 92.9% on average. However, the digestion slurry still contained high concentrations of fecal coliform, which could not reach the requirement of sanitary. These results could provide a theoretical reference for the stable and healthy operation and management of large and medium-sized biogas plants.
Number of references:20
Main heading:Biogas
Controlled terms:Anaerobic digestion - Biology - Coliform bacteria - Methane - Plants (botany)
Uncontrolled terms:Biogas plants - Biological properties - Dairy farms - Design and construction - Digestate - Fecal Coliform - Field investigation - High concentration - Jiangsu province - Large and medium-sized biogas plant - Operation and management - Operation status - Rapid development - Residual biogas production - Residual methane production - Total solids
Classification code:461.9 Biology - 522 Gas Fuels
DOI:10.3969/j.issn.1002-6819.2012.06.036
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 21>
Accession number:20121314899970
Title:Analysis and system construction of safety early warning for cultivated land resources in Heilongjiang province
Authors:Song, Ge (1); Lian, Chen (1)
Author affiliation:(1) College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China
Corresponding author:Song, G.(songgelaoshi@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:247-252
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:Security warning of the cultivated land resources is an effective means to protect arable land and realize the sustainable utilization of cultivated land resources. Taken Heilongjiang province as the research area in this paper, the safety warning index system of cultivated land resources was established from the perspective of cultivated land protection and by combining with the three aspects including the quantity, quality and ecological environment of cultivated land. Security quantitative evaluation value of cultivated land resources in 1996-2008 was taken as basic data in study area and the longitudinal judgment method was used to determine threshold value of safety degree for cultivated land resource in research area. And GM (1.1) and the BP neural network technology were used to forecast and analyze the change trend and safety degree of cultivated land resources from 2012 to 2015 in Heilongjiang province, and then security warning system of cultivated land resources was constructed. The results indicated that safety values of cultivated land resources appeared to irregularly decline from 1996 to 2008 in Heilongjiang province. Warning degree of cultivated land resources in 2012 were slight, and that from 2013-2015 was middle and its situation was became worse. The quality of cultivated land descended while quantity of cultivated land increased in 2012, and the quantity of cultivated land increased slightly from 2013-2015, but the quality of cultivated land continuously decreased. The ecological environment gently rose from 2012-2015.So during warning period, incoordinative development between quantity and quality of cultivated land resources quantity caused to warn in Heilongjiang province, and the urbanization level, water and soil loss ratio and resilience index and so on were the sensitive factors to affect of security conditions of cultivated land resources in Heilongjiang province. This paper provides a reference for a relevant pre-warning research.
Number of references:21
Main heading:Land use
Controlled terms:Alarm systems - Ecology - Forecasting - Natural resources - Neural networks - Quality control - Research
Uncontrolled terms:Arable land - BP neural networks - Change trends - Cultivated lands - Early warning - Ecological environments - Heilongjiang province - Judgment method - Quantitative evaluation - Research areas - Resilience index - Safety degree - Safety values - Security warning - Soil loss - Study areas - Sustainable utilization - System construction - Urbanization levels - Warning index
Classification code:914.2 Fires and Fire Protection - 913.3 Quality Assurance and Control - 901.3 Engineering Research - 723.4 Artificial Intelligence - 921 Mathematics - 512 Petroleum and Related Deposits - 454.3 Ecology and Ecosystems - 444 Water Resources - 403 Urban and Regional Planning and Development - 501 Exploration and Prospecting
DOI:10.3969/j.issn.1002-6819.2012.06.040
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 22>
Accession number:20121314899968
Title:Regional grain security pre-warning based on entropy weight extension decision model
Authors:Lei, Xunping (1); Wu, Yang (1); Ye, Song (1); Chen, Zhaorong (1); Wang, Liang (1)
Author affiliation:(1) Institute of Rural Economy and Culture, Tongling University, Tongling 244000, China; (2) School of Economics and Management, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Corresponding author:Lei, X.(leixunping@126.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:233-239
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:Evaluating grain security state quantitatively and determining the index weight objectively are important for regional grain security. Considering the factors about grain supply and demand, an index system of grain security pre-warning was established, and a regional grain security pre-warning model based on entropy weight and extensional theory was built. The model was applied to the grain security pre-warning analysis of Anhui province in recent 11 years (2000-2010). The results showed that the grain security situation could be divided into three states: heavy warning (2000-2004), moderate warning (2000-2004) and security state (2007-2010). The change of grain security degree of pre-warning was consistent with the fluctuation of single pre-warning index, and comprehensive security degree gradually increased. The model proposed improves the capacity of grain security pre-warning, quantitative evaluating grain security state and gives a new way for implementing grain security supervision.
Number of references:22
Main heading:Entropy
Controlled terms:Decision making - Economics - Grain (agricultural product) - Models
Uncontrolled terms:Anhui province - Decision models - Entropy weight - Entropy weights - Extension decision - Grain security - Grain security pre-warning - Index systems - Index weight - Model-based OPC - Quantitative evaluating - Security degree - Supply and demand
Classification code:641.1 Thermodynamics - 821.4 Agricultural Products - 902.1 Engineering Graphics - 912.2 Management - 971 Social Sciences
DOI:10.3969/j.issn.1002-6819.2012.06.038
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 23>
Accession number:20121314899960
Title:Concurrent processing of web service for crop model based on caching mechanism
Authors:Fu, Bing (1); Jiang, Haiyan (1); Xu, Xiaoming (1); Liu, Xiaojun (1); Cao, Weixing (1); Zhu, Yan (1)
Author affiliation:(1) Jiangsu Key Laboratory for Information Agriculture, National Engineering and Technology Center for Information Agriculture, Nanjing Agricultural University, Nanjing 210095, China; (2) College of Information Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
Corresponding author:Zhu, Y.(yanzhu@njau.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:184-190
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 improve the responding time of web services for crop model, the concurrent processing scenario of web services for crop model was proposed in this paper. By analyzing the combination structure of web services for crop model, communication features of data web services and responding time feature of web services for crop model, the concurrent processing scenario of web services for crop model was designed based on multi-thread processing and data caching technology. Taking web services of crop management knowledge model as the testing target, the effectiveness of concurrent processing scenario was verified in a real network environment. The results showed that the responding time of web service for crop model with concurrent processing scenario reduced 32% and 35% for single-user at multi-location and multi-user at multi-location, respectively, which improved the model ability for multi-user concurrent processing. These results provide the technical support for regional application of crop model.
Number of references:18
Main heading:Web services
Controlled terms:Crops - Data handling - Models - Websites
Uncontrolled terms:Caching mechanism - Combination structure - Communication features - Concurrent processing - Crop managements - Crop model - Data caching - Knowledge model - Multi-thread - Multi-user - Real networks - Responding time - Single users - Technical support
Classification code:902.1 Engineering Graphics - 821.4 Agricultural Products - 723.2 Data Processing and Image Processing - 723 Computer Software, Data Handling and Applications - 718 Telephone Systems and Related Technologies; Line Communications - 717 Optical Communication - 716 Telecommunication; Radar, Radio and Television
DOI:10.3969/j.issn.1002-6819.2012.06.030
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 24>
Accession number:20121314899975
Title:Effect of paperboard packaging inner coated with preservation agents on fresh-keeping of honey peach
Authors:Xiao, Gongnian (1); Sha, Lizheng (2); Yan, Lingyan (1); Yu, Jin'an (2); Zhao, Huifang (2); Zhou, Qunbo (2)
Author affiliation:(1) Key Laboratory of Agricultural Products Chemical and Biological Processing Technology, Zhejiang University of Science and Technology, Hangzhou 310023, China; (2) School of Light Industry, Zhejiang University of Science and Technology, Hangzhou 310023, China
Corresponding author:Xiao, G.
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:274-277
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 investigate the preservation effect of paperboard packaging box with inner coating preservation agents, honey peach (Prunus persica L. cv. "fenghua") was studied. The experimental treatments included paperboard packaging storaged at room temperature (25°C), paperboard packaging storaged at 4-6°C, packaging by the paperboard with inner coating layer stored at room temperature (25°C), packaging by the paperboard with inner coating layer stored at 4-6°C, no packaging storaged at 4-6°C as low temperature control group, and no packaging storage at room temperature as normal control group. The results show that the paperboard packaging box with inner coating preservation agents of 0.8% nisin and 0.5% natamycin could effectively inhibit the respiration of Honey peach, maintain the peach flavor and flesh firmness, and can inhibit the texture changes effectively.
Number of references:16
Main heading:Food products
Controlled terms:Agricultural products - Coatings - Energy storage - Packaging - Paperboards
Uncontrolled terms:Honey peach - Inner coatings - Normal controls - Paperboard packaging - Prunus persica - Room temperature - Shelf life
Classification code:539 Metals Corrosion and Protection; Metal Plating - 694.1 Packaging, General - 702 Electric Batteries and Fuel Cells - 811.1 Pulp and Paper - 821.4 Agricultural Products - 822.3 Food Products
DOI:10.3969/j.issn.1002-6819.2012.06.045
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 25>
Accession number:20121314899939
Title:Flow pattern analysis on inlet and outlet conduit of shaft tubular pump system of Pizhou pumping station in South-to-North Water Diversion Project
Authors:Xu, Lei (1); Lu, Linguang (1); Chen, Wei (1); Wang, Gang (1)
Author affiliation:(1) College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China
Corresponding author:Lu, L.(yzlulg@126.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:50-56
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 reveal the relationship between the internal characteristics and external characteristics of shaft tubular pump system and to perfect its theory of the optimum hydraulic design, flow patterns of the conduit surface and the sections perpendicular to x, y, z directions for shaft tubular pump system of Pizhou pumping station in Eastern Route of South-to-North Water Diversion Project were analyzed in detail from all angles of view by 3D turbulent numerical simulation. And the numerical simulation results of the flow pattern were verified by both transparent conduit model test and transparent pump system model test. The results of numerical computation and model test came to the conclusions as follows: 1) Flow pattern was uniform and smooth in the inlet conduit of the pump system, and the stream line layers were clear; 2) Flow in the outlet conduit diffused gently in the form of spiral motion, and there was no improper flow such as separation or vortex in the conduit; 3) The main reason of the excellent hydraulic performance of the pump system was due to the excellent internal characteristics. At the main operation points of the pump system, the pump system efficiency exceeded 83%, critical cavitation flow margin was lower than 5 m and the hydraulic performance of the pump system was excellent. The research results provide a beneficial reference for the hydraulic design of pumping stations with low head.
Number of references:20
Main heading:Pumps
Controlled terms:Computational fluid dynamics - Computer simulation - Flow patterns - Inlet flow - Pumping plants - Water piping systems
Uncontrolled terms:3D turbulent - Cavitation flow - Conduit model - External characteristic - Hydraulic designs - Hydraulic performance - Inlet conduit - Internal characteristics - Low head - Model tests - Numerical computations - Operation point - Outlet conduit - Pattern analysis - Pump system - Pumping stations - Research results - Shaft tubular pump system - South-to-North water diversion project - Spiral motion - Stream lines - Z-directions
Classification code:446 Waterworks - 446.1 Water Supply Systems - 618.2 Pumps - 631.1 Fluid Flow, General - 723.5 Computer Applications
DOI:10.3969/j.issn.1002-6819.2012.06.009
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 26>
Accession number:20121314899934
Title:Design and experiment of variable rate fertilizer spreader with conveyor chain
Authors:Zhang, Rui (1); Wang, Xiu (1); Zhao, Chunjiang (1); Bai, Youlu (2); Meng, Zhijun (1); Chen, Liping (1)
Author affiliation:(1) National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China; (2) Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Corresponding author:Zhao, C.(zhaocj@nercita.org.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:20-25
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 problem of lacking suitable variable rate fertilizer spreader in China, a variable rate fertilizer spreader with conveyor chain based on prescription map was designed. A motional equation of fertilizer granular at the moment of thrown from disc border was established through analyzing force and motion of fertilizer granular at spreader disc, and then the system of key components was designed and the corresponding machinery parameters were confirmed, such as variable rate control system, fertilizer box, the auto-opening device of gate etc. The experiments on different fertilizer amount and uniformity were conducted with a variable rate fertilizer spreader. Results showed that the spreader's effect of variable rate fertilization and uniformity of the spreader was better. When the speed of tractor was 1.5 m/s, relative error between actual application amount and pre-setting amount was less than 7.53%. When the speed of tractor was 2 m/s, the coefficient of variance was 14.90%, fertilization amount was 225 kg/hm<sup>2</sup> and the spreader breadth was 30 m, which indicates the spreader can meet the need of practical production.
Number of references:20
Main heading:Spreaders
Controlled terms:Agricultural machinery - Conveyors - Experiments - Fertilizers - Structure (composition) - Tractors (truck)
Uncontrolled terms:Coefficient of variance - Practical production - Pre-setting - Prescription map - Relative errors - Variable rate - Variable rate fertilization
Classification code:663.1 Heavy Duty Motor Vehicles - 692.1 Conveyors - 804 Chemical Products Generally - 821.1 Agricultural Machinery and Equipment - 901.3 Engineering Research - 951 Materials Science
DOI:10.3969/j.issn.1002-6819.2012.06.004
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 27>
Accession number:20121314899978
Title:Kinetics of chlorophyll degradation and color loss in heated kiwifruit puree
Authors:Zhang, Lihua (1); Li, Shunfeng (1); Liu, Xinghua (1); Wang, Liding (1); Sun, Xiaolu (1)
Author affiliation:(1) College of Food Science and Engineering, Northwest Agriculture and Forestry University, Yangling 712100, China
Corresponding author:Liu, X.(liuxh2830@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:289-292
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 investigate thermal degradation kinetics of chlorophyll and green color of kiwifruit puree during heat processing, the effects of pH value on the chlorophyll degradation and visual green color loss in kiwifruit puree were studied at 70, 80 and 90°C combined with pH value of 3.3, 6.0 and 8.0. Results showed that the breakdown of chlorophyll a, chlorophyll b and green color loss (-a*) values followed a first-order reaction. With the increase of temperature and pH value, the rate constant and half-life value of chlorophyll a, chlorophyll b and green color loss (-a*) values decreased. The activation energies ranged from 14.69-66.02 KJ/mol, 40.88-54.64 kJ/mol and 48.55-64.14 kJ/mol for chlorophyll a, chlorophyll b and green color loss (-a*) values, respectively. In addition, significant correlation between chlorophylls and green color loss (-a*) values were found for kiwifruit puree at pH 3.3. Higher pH value would benefit for preserving chlorophylls and green color in heated kiwifruit puree.
Number of references:18
Main heading:Chlorophyll
Controlled terms:Activation energy - Degradation - Dynamics - pH - pH effects - Pyrolysis - Rate constants - Temperature
Uncontrolled terms:Chlorophyll a - Chlorophyll b - Chlorophyll degradation - First order reactions - Green color - Heat processing - Kiwifruits - pH value - Thermal degradation kinetics
Classification code:641.1 Thermodynamics - 801 Chemistry - 802.2 Chemical Reactions - 931.1 Mechanics - 931.3 Atomic and Molecular Physics
DOI:10.3969/j.issn.1002-6819.2012.06.048
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 28>
Accession number:20121314899952
Title:Effects of drip irrigation threshold on yield and quality of muskmelon in plastic greenhouse
Authors:Li, Yijie (1); Yuan, Baozhong (1); Bie, Zhilong (2); Kang, Yaohu (3)
Author affiliation:(1) College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; (2) College of Horticulture and Forestry, Huazhong Agricultural University, Wuhan 430070, China; (3) Institute of Geographical Sciences and Natural Resource Research, Chinese Academy of Sciences, Beijing 100101, China
Corresponding author:Yuan, B.(yuanbz@mail.hzau.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:132-138
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 different soil water content threshold on growth, yield production and irrigation water utility efficiency of muskmelon (Cucumis melo L., Yilishabai variety) in greenhouse, four treatments of soil water content thresholds (I45 with 45% field capacity, I55 with 55% field capacity, I65 with 65% field capacity, I75 with 75% field capacity) were conducted, and a furrow irrigation (G75 with 75% field capacity) as control treatment. The results showed that plant height, stem diameter, leaf area and aboveground biomass decreased with soil water content threshold declined. Values of fruit diameter, pericarp thickness and flesh thickness are the largest for treatment I75, while the index of fruit shape is the least; but the fruit length of I65 is the biggest. As to the fruit quality, total soluble solids (TSS) content ranked as: I65>I55>I75>I45; soluble sugar content ranked as: I55>I65>I45>I75; Vitamin C (Vc) content ranked as: I55>I65>I75>I45; soluble protein content as follows: I55>I65>I45>I75; free amino acid content as follows: I45>I65>I55>I75.The yield and mean fruit weight are highest for I75; the value of water use efficiency for I65 is the highest among the treatments as to 29.16 kg/m<sup>3</sup> that is 76.4% higher than that of furrow irrigation (G75), it can save irrigation water 58.1% and the mean fruit weight only declined 3.2% compared with furrow irrigation. Therefore, based on production and quality, 65% field capacity would be the most appropriate thresholds for muskmelon starting irrigation on vegetative growth stage.
Number of references:22
Main heading:Irrigation
Controlled terms:Amino acids - Electric utilities - Fruits - Greenhouses - Quality management - Soil moisture - Sugars - Water supply
Uncontrolled terms:Above ground biomass - Cucumis melo - Drip irrigation - Field capacity - Flesh thickness - Free amino acids - Fruit quality - Fruit shape - Fruit weight - Furrow irrigation - Irrigation waters - Leaf area - Plant height - Plastic greenhouse - Soil water content - Soluble proteins - Soluble sugars - Stem diameter - Total soluble solids - Vegetative growth - Vitamin C - Water use efficiency - Yield production
Classification code:446.1 Water Supply Systems - 483.1 Soils and Soil Mechanics - 706 Electric Transmission and Distribution - 804.1 Organic Compounds - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 913.3 Quality Assurance and Control
DOI:10.3969/j.issn.1002-6819.2012.06.022
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 29>
Accession number:20121314899931
Title:Application prospect of sprinkler irrigation technology in water-short areas of northern China
Authors:Li, Zongli (1); Zhao, Wenju (1); Sun, Wei (1); Fan, Yanwei (1)
Author affiliation:(1) College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China; (2) General Institute for Water Resources and Hydropower Planning and Design, Ministry of Water Resources, Beijing 100120, China
Corresponding author:Li, Z.(lizongli@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:6
Issue date:March 15, 2012
Publication year:2012
Pages:1-6
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:Sprinkler irrigation is a water-saving irrigation mode with mature technology and wide application, which will have a broad prospect in popularization and application in the northern region. On the basis of the status and restrictive factors of irrigation development in water-short areas of northern China, comparative analyses of border irrigation, sprinkler irrigation, optimized permanent and semi-permanent sprinkler system were conducted by case studies. And the comparative indexes included investment, benefit, labor intensity etc. The results showed that compared with the investment of border irrigation, sprinkler irrigation reduced the investment by 77.85%, saved water by 56%, and saved water fee by 468.75 yuan per hectare. Compared with permanent sprinkler system and optimized permanent sprinkler system, semi-permanent sprinkler system decreased the cost by 70.62% and 48.86%, respectively, and the labor intensity of which was higher. Finally, the strategic countermeasures of future development of sprinkler irrigation were proposed in the view of increasing government investment, strengthening the unified management of sprinkler irrigation projects, reducing costs, strengthening technology research of sprinkler irrigation and the development and extension of large-scale sprinkler machine etc. This research can provide theoretical guidance for relieving water shortages in northern China, developing and expanding the sprinkler irrigation technology.
Number of references:20
Main heading:Sprinkler systems (irrigation)
Controlled terms:Economic analysis - Factor analysis - Investments - Irrigation canals - Optimization - Research - Research and development management - Sprinkler systems (fire fighting) - Water supply
Uncontrolled terms:Application prospect - Border irrigation - Comparative analysis - Development status - Government investment - Irrigation development - Labor intensity - Northern China - Northern regions - Reducing costs - Sprinkler irrigation - Technology research - Water shortages - Water-saving irrigation - Water-short area
Classification code:922.2 Mathematical Statistics - 921.5 Optimization Techniques - 914.2 Fires and Fire Protection - 911.2 Industrial Economics - 901.3 Engineering Research - 821.1 Agricultural Machinery and Equipment - 446.1 Water Supply Systems
DOI:10.3969/j.issn.1002-6819.2012.06.001
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 30>
Accession number:20121314899948
Title:Applicability of simple estimating method for reference crop evapotranspiration in Loess Plateau
Authors:Li, Zhi (1)
Author affiliation:(1) College of Resources and Environment, Northwest Agriculture and Forestry University, Yangling 712100, China
Corresponding author:Li, Z.(lizhibox@126.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:106-111
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:Some methods for estimating reference crop evapotranspiration (ET<inf>0</inf>) are widely used in regions with insufficient meteorological data, but their applicabilities should be evaluated. The performances of six simple methods for estimating ET<inf>0</inf> (i. e. FAO-24 Rad, FAO-24 BC, Hargreaves, Priestley-Taylor, Makkink and Turc) are evaluated based on the meteorological data from 48 stations during 1961-2009 in the Loess Plateau. Results showed that FAO-24 BC and Hargreaves equations were satisfactory to estimate annual ET<inf>0</inf> while Makkink and Priestley-Taylor methods are not. The estimation errors of annual ET<inf>0</inf> mainly come from those in November to March, while in April to October were very small. Spatial variability exist in the applicability of the six methods. FAO-24 BC and Hargreaves performs better at most stations while the other methods, especially for Makkink and Priestley-Taylor, provide unsatisfactory results. Most methods are not suitable for estimating ET<inf>0</inf> in the southwest region except for Priestley-Taylor. Overall, FAO-24 BC and Hargreaves are recommended as the priority simple methods for calculating ET<inf>0</inf> in the Loess Plateau.
Number of references:20
Main heading:Estimation
Controlled terms:Crops - Evapotranspiration - Meteorology - Water supply
Uncontrolled terms:Applicability - Crop evapotranspiration - Estimating method - Estimation errors - Hargreaves - Hargreaves equations - Loess Plateau - Meteorological data - Priestley-Taylor - SIMPLE method - Spatial variability
Classification code:443 Meteorology - 444.1 Surface Water - 446.1 Water Supply Systems - 821.4 Agricultural Products - 921 Mathematics
DOI:10.3969/j.issn.1002-6819.2012.06.018
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 31>
Accession number:20121314899953
Title:Regulated deficit irrigation effect of winter wheat under different fertilization treatments
Authors:Ma, Shouchen (1); Zhang, Xucheng (3); Duan, Aiwang (1); Yang, Shenjiao (1); Sun, Jingsheng (1)
Author affiliation:(1) Key Lab. for Crop Water Requirement and Regulation, Ministry of Agriculture, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453003, China; (2) School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China; (3) Key Laboratory of Northwest Crop Drought-Resistant Farming, Ministry of Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China
Corresponding author:Duan, A.(mashouchen@126.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:139-143
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 plot experiment was conducted to explore regulated deficit irrigation effects of winter wheat under different fertilization treatments: no fertilizer (F0), compound fertilizer (F1) and fertilizer compound fertilizer (F2), and with appropriate water deficit treatment at the returning green-jointing stage. The results showed that water deficit at the returning green-jointing stage had no significant effect on photosynthesis of winter wheat under F2 condition, F2 had super-compensation effect in photosynthesis after re-watering, compared to F0 and F1 treatments. At anthesis stage, there were no significant differences on leaf area, plant height, dry matter mass per shoot and spike number between regulated deficit irrigation and well-watered wheat under F2 condition. Under well-water condition after heading stage, water deficit treatment at returning green-jointing stage had no significant effect on grain yield of wheat with F2, but significantly reduced grain yields of wheat under F0 and F1 conditions; under the progressive soil dying condition after heading, water deficit treatment at returning green-jointing improved grain yield of wheat under F2 condition, and yield stability of regulated deficit irrigation wheat with F2 was higher than those with F0 and F1. It is suggested that the fertilizer compound fertilizer treatment has optimal regulated deficit irrigation effect for winter wheat.
Number of references:18
Main heading:Grain (agricultural product)
Controlled terms:Crops - Experiments - Fertilizers - Irrigation - Photosynthesis - Plants (botany)
Uncontrolled terms:Compound fertilizer - Dry matters - Grain yield - Leaf area - Plant height - Regulated deficit irrigation - Water deficits - Winter wheat - Yield stability
Classification code:461.9 Biology - 741.1 Light/Optics - 804 Chemical Products Generally - 821.3 Agricultural Methods - 821.4 Agricultural Products - 901.3 Engineering Research
DOI:10.3969/j.issn.1002-6819.2012.06.023
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 32>
Accession number:20121314899974
Title:Effect of different 1-substituted cyclopropenes as ethylene inhibitors on postharvest physiology of apple stored at ambient temperature
Authors:Cheng, Shunchang (1); Leng, Junying (2); Ren, Xiaolin (3); Wei, Baodong (1); Fu, Lin (2); Feng, Xuqiao (1)
Author affiliation:(1) Institute of Food Nutrition, Quality and Safety, Shenyang Agricultural University, Shenyang 110866, China; (2) College of Food Science, Shenyang Agricultural University, Shenyang 110866, China; (3) College of Horticulture, Northwest Agriculture and Forestry University, Yangling, 712100, China
Corresponding author:Feng, X.(feng_xq@hotmail.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:269-273
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:Effects of three 1-substituted cyclopropenes with different branch chain lengths on postharvest physiology of 'Hanfu' apple were investigated. The apple were packed with plastic bags (0.02 mm) after being fumigated for 20 h with 0.75 μL/L 1-MCP (1-Methylcyclopropene), 2 μL/L 1-PentCP (1-pentylcyclopropene) and 0.5 μL/L 1-OCP (1-octylcyclopropene) respectively and then stored at ambient temperature (20°C). The results showed that 1-MCP and 1-PentCP treatments reduced ethylene production and respiration rate with respiration peak delayed by 4 days and ethylene peak by 8 days compared with those of control. Both treatments also delayed firmness loss and retarded the increase in soluble solids and malondialdehyde content, meanwhile, they retarded the changes of the activity of peroxidase, superoxide dismutase and catalase. However, malondialdehyde content increased with 1-OCP treated fruits that resulted in some detrimental effect during the late period of storage. It is suggested that both 1-MCP and 1-PentCP can be applied to inhibit physiological metabolism, maintain fruit quality, decrease membrane injury, and delay senescence of 'Hanfu' apple fruits.
Number of references:19
Main heading:Fruits
Controlled terms:Aldehydes - Energy storage - Ethylene - Oxygen - Physiology - Plants (botany) - Plastic containers - Temperature
Uncontrolled terms:1-MCP - 1-methylcyclopropene - 1-Octylcyclopropene - Apple - Apple fruits - Cyclopropenes - Detrimental effects - Ethylene inhibitors - Ethylene production - Fruit quality - Malondialdehyde - Plastic bags - Postharvest - Respiration rate - Soluble solids - Super oxide dismutase
Classification code:804.1 Organic Compounds - 804 Chemical Products Generally - 702 Electric Batteries and Fuel Cells - 821.4 Agricultural Products - 694 Packaging - 641.1 Thermodynamics - 461.9 Biology - 691 Bulk Handling and Unit Loads
DOI:10.3969/j.issn.1002-6819.2012.06.044
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 33>
Accession number:20121314899944
Title:Characteristic analysis of temperature, soil water and salt during maximum freezing depth period based on wavelet transform
Authors:Li, Ruiping (1); Shi, Haibin (1); Zhang, Xiaohong (2); Li, Zhengzhong (2)
Author affiliation:(1) College of Water Conservation and Civil Engineering, Inner Mongolia Agricultural University, Huhhot 010018, China; (2) General Administration of Hetao Irrigation District, Inner Mongolia, Linhe 015000, China
Corresponding author:Shi, H.(shi_haibin@sohu.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 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:Water and salt coupling transfer in freezing and thawing soils is the difficult point and hotspot research of soil water science. In order to understand the variation characteristics of air temperature and water salt, in this study, variation characteristics of daily minimum air temperature, average moisture and salt within 0-40 cm soil depth were analyzed using the Mexican hat function during freezing period in Feb. for 12 years (1994-2006) in Hetao Irrigation District, Inner Mongolia. The results showed that daily minimum air temperature and soil water salt change had a periodic characteristic during study period. The strongest wave period was 3 year, 2 year, 2 year for daily minimum air temperature, average moisture and salt within 0-40 cm soil depth, respectively. The changes of daily minimum air temperature show correlation with that of soil water and salt. High temperature period corresponded to that of the low water and high salinity, respectively. There are two abrupt change points around 1997 and 2000. Scale change of soil salt presented much more complicated compared with that of air temperature and soil water, respectively. These results are useful to soil salinization prevention and water-saving reconstruction in arid-cold area in future research.
Number of references:20
Main heading:Soil moisture
Controlled terms:Atmospheric temperature - Freezing - Salts - Temperature - Thawing - Water conservation - Wavelet transforms
Uncontrolled terms:Air temperature - Change-points - Characteristic analysis - Freezing and thawing - Freezing-thawing - High salinity - High temperature - Hot spot - Inner Mongolia - Irrigation districts - Low water - Soil depth - Soil salinization - Soil water - Variation characteristics - Water-saving - Wave period
Classification code:921.3 Mathematical Transformations - 822.2 Food Processing Operations - 804.1 Organic Compounds - 641.1 Thermodynamics - 483.1 Soils and Soil Mechanics - 444 Water Resources - 443.1 Atmospheric Properties
DOI:10.3969/j.issn.1002-6819.2012.06.014
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 34>
Accession number:20121314899967
Title:Effect of pretreatment with high-temperature composite strains WSC-6 on biogas production of rice straw
Authors:Pan, Yunxia (1); Li, Wentao (2); Liu, Shuang (2); Li, Wenzhe (2)
Author affiliation:(1) College of Engineering and Technology, Southwest University, Chongqing 400716, China; (2) College of Engineering, Northeast Agriculture University, Harbin 150030, China
Corresponding author:Li, W.(liwenzhe9@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:228-232
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 improve the acidification efficiency of rice straw in biogas production, provide cheap nitrogen source for the growth of high-temperature composite strains WSC-6, and reduce operating costs, biological pretreatment of rice straw was carried out by high-temperature composite strains WSC-6 and using untreated rice straw as carbon source and fresh swine manure or dried swine manure as nitrogen source. The result indicated that nitrogen source in fresh swine manure could be sufficiently utilized by high-temperature composite strains WSC-6, and the utilization rate of total nitrogen reached to 81.5%. The degradation rate of rice straw in fresh swine manure was also higher than that in dried swine manure, and total degradation rate of rice straw in fresh swine manure was 48.3%, and degradation rate of cellulose, hemicellulose and lignin was 67.3%, 79.3% and 27.9%, respectively. In biological pretreatment process of rice straw, whether fresh swine manure or dried swine manure as nitrogen source, the reaction would not produce acidification with pH values ranging from 6.5 to 8.2. Fresh swine manure as nitrogen source both reduced biological pretreatment costs of rice straw, and eliminated the environmental pollution, which is important to improve the biogas industrialization production.
Number of references:25
Main heading:Manures
Controlled terms:Acidification - Biogas - Cellulose - Degradation - Fertilizers - Nitrogen - Straw
Uncontrolled terms:Biogas production - Biological pre-treatment - Carbon source - Degradation rate - Environmental pollutions - High temperature - Nitrogen sources - pH value - Pre-Treatment - Rice straws - Swine manure - Total nitrogen - Utilization rates
Classification code:802.2 Chemical Reactions - 804 Chemical Products Generally - 815.1.1 Organic Polymers - 821.5 Agricultural Wastes - 822.2 Food Processing Operations
DOI:10.3969/j.issn.1002-6819.2012.06.037
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 35>
Accession number:20121314899943
Title:Salt movement of seasonal freezing-thawing soil under autumn irrigation condition
Authors:Peng, Zhenyang (1); Huang, Jiesheng (1); Wu, Jingwei (1); Abuduheni (1)
Author affiliation:(1) State Key Laboratory of Water Resource and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
Corresponding author:Huang, J.(jshuanga@public.wh.hb.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:77-81
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 view of severe salt accumulation in Hetao irrigation district, Inner Mongolia, during spring, salt movement of seasonal freezing-thawing soil after autumn irrigation was analyzed based on field experiment. Results showed that soil salt only leached to deeper layers in a short time after autumn irrigation, and they were mainly discharged from field during early freezing period. Influenced by both freezing and discharging process, salt movement was complex and resulted in little salt storage change of frozen layer during the freezing period, while the main process of salt accumulation happened in the thawing period. After the whole experiment period, salt storage in the layer of 0-100 cm and 0-150 cm both increased, which indicated that the autumn irrigation did not accomplish leaching salt absolutely. It was also found that good drainage conditions inhibit salt upflowing in some degree, which presented significantly during the freezing process.
Number of references:12
Main heading:Irrigation
Controlled terms:Freezing - Leaching - Salts - Soils - Thawing
Uncontrolled terms:Discharging process - Drainage condition - Field experiment - Freezing process - Freezing-thawing - Frozen layer - Hetao irrigation district - Inner Mongolia - Irrigation districts - Main process - Thawing period
Classification code:483.1 Soils and Soil Mechanics - 533.1 Ore Treatment - 804.1 Organic Compounds - 821.3 Agricultural Methods - 822.2 Food Processing Operations
DOI:10.3969/j.issn.1002-6819.2012.06.013
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 36>
Accession number:20121314899941
Title:Effect of airflow speed on pollens distribution for hybrid rice breeding pollination
Authors:Wang, Huimin (1); Tang, Chuzhou (1); Li, Ming (1); Li, Zhongqiu (1); Huang, Zhen (1); Wu, Mingliang (1); He, Juying (3); Zhang, Haiqing (4)
Author affiliation:(1) College of Engineering, Hunan Agricultural University, Changsha 410128, China; (2) Hunan Provincial Engineering Technology Research Center for Modern Agricultural Equipment, Changsha 410128, China; (3) Long Ping High-Tech. Co. Ltd., Changsha 410000, China; (4) Collage of Agronomy, Hunan Agricultural University, Changsha 410128, China
Corresponding author:Wang, H.(whm19860603wyhj@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:6
Issue date:March 15, 2012
Publication year:2012
Pages:63-69
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:Effect of airflow speed (including natural wind) on pollens distribution for hybrid rice breeding pollination is very significant, which correlates with the yield of breeding seed closely. To study the effect of airflow speed on pollination, the basic principle of pneumatic pollination for hybrid rice breeding was analyzed. Then, tests were conducted to validate the effect of airflow speed on pollens distribution based on pollens density, horizontal distribution and vertical distribution. The results showed that pollens distribution was affected by airflow speed significantly, and pollens density, horizontal distribution and vertical distribution increased with the airflow speed increased. A distinct bimodal pattern appeared in horizontal distribution, and the second peak was far away from the pollen source with the airflow speed increased. Vertical distribution showed that pollens were close to the center of airflow with the airflow speed increased, which suggested that pollens could be spread in straight line with a certain speed and directional airflow. When the airflow speed was at 20 m/s, pollens were more in horizontal distribution, of which the vertical distribution could meet the demand of transmitting in the working area. It provides a scientific basis for further study of pollination machinery by airflow.
Number of references:20
Main heading:Speed
Controlled terms:Agricultural machinery - Flow velocity - Seed
Uncontrolled terms:Airflow speed - Basic principles - Horizontal distribution - Hybrid rice - Natural wind - Pollination - Rice breeding - Vertical distributions - Working areas
Classification code:631 Fluid Flow - 821.1 Agricultural Machinery and Equipment - 821.4 Agricultural Products - 931.1 Mechanics
DOI:10.3969/j.issn.1002-6819.2012.06.011
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 37>
Accession number:20121314899954
Title:Effects of organic fertilizer application on soil moisture and economic returns of maize in dryland farming
Authors:Wang, Xiaojuan (1); Jia, Zhikuan (1); Liang, Lianyou (3); Han, Qingfang (1); Yang, Baoping (1); Ding, Ruixia (1); Cui, Rongmei (1); Wei, Ting (1)
Author affiliation:(1) Chinese Arid Area Research Institute of Water-Saving Agriculture, Northwest Agriculture and Forestry University, Yangling 712100, China; (2) Key Lab. of Crop Physi-Ecology and Tillage Sci. in Northwestern loess Plateau, Min. of Agriculture, Yangling 712100, China; (3) College of Resources and Environment, Northwest Agriculture and Forestry University, Yangling 712100, China
Corresponding author:Jia, Z.(Zhikuan@tom.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:144-149
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 experiment (2007-2010) was conducted at Weibei Dryland to determine the effects of different organic fertilizer rates on soil moisture and economic returns of maize (Zea mays L.). Organic fertilizer at rates of 0 (CK), 7500, 15000 and 22500 kg·hm<sup>-2</sup> combined with the same rate of chemical fertilizer was applied into field plots. The results showed that manure treatments significantly increased soil moisture storage by 11.49%-21.63% compared with CK; high rate of manure treatment increased soil moisture storage by 9.09% than low rate of manure treatment during maize big trumpet period in the fourth year of fertilization(2010). High rate of manure treatment significantly increased the average soil moisture storage in 200 cm soil layer by 4.79%-7.65% compared with control. Medium rate of manure treatment had significantly higher average soil moisture storage in 200 cm soil layer by 6.50% than control in the fourth year of fertilization. Manure treatments significantly increased water use efficiency by12.37%-37.55% compared with control. High and medium rates of manure treatments significantly increased water use efficiency in contrast with low rate of manure treatment. Soil conditions were no longer the major limiting factors for increasing water use efficiency with the manure application years increased. It is suggested that medium rate of manure treatment had an obvious effect on conserving moisture and increasing income of maize.
Number of references:29
Main heading:Manures
Controlled terms:Efficiency - Fertilizers - Grain (agricultural product) - Moisture - Soil moisture - Soils - Water supply
Uncontrolled terms:Chemical fertilizers - Dry land - Dryland farming - Economic returns - Field experiment - Field plot - High rate - Limiting factors - Low rates - Maize (Zea mays L.) - Manure applications - Manure treatment - Moisture storage - Organic fertilizers - Soil conditions - Soil layer - Water use efficiency
Classification code:913.1 Production Engineering - 821.5 Agricultural Wastes - 821.4 Agricultural Products - 804 Chemical Products Generally - 801.4 Physical Chemistry - 483.1 Soils and Soil Mechanics - 446.1 Water Supply Systems
DOI:10.3969/j.issn.1002-6819.2012.06.024
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 38>
Accession number:20121314899977
Title:Preparation of rice straw and starch-based biodegradable decorative materials
Authors:Liu, Junjun (1); He, Chunxia (1)
Author affiliation:(1) Key Laboratory of Intelligence Agricultural Equipment, College of Engineering, Nanjing Agricultural University, Nanjing 210031, China
Corresponding author:He, C.(walhfg96@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:6
Issue date:March 15, 2012
Publication year:2012
Pages:283-288
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:Based on environmental protection and use of agricultural residues, rice straw/starch composites were manufactured using molding method. The influences of pretreatment on rice straw fiber characteristics and physical-mechanical properties of decorative materials were studied. Results showed that pretreatment could change straw fiber surface properties or remove its chemical composition partly, and improve fiber wettability. Mechanical properties were the best with straw decorative materials treated by hot-water and adhesives content at 10%. The decorative materials after 2 h had great thickness swelling and poor waterproof, but considerable moisture proof and environment-friendly properties, and such materials could be used for indoor decorative materials.
Number of references:16
Main heading:Swelling
Controlled terms:Agricultural wastes - Biodegradation - Materials - Mechanical properties - Starch - Straw - Surface properties - Water treatment - Wetting
Uncontrolled terms:Chemical compositions - Environment friendly - Fiber characteristics - Molding methods - Physical-mechanical properties - Pre-Treatment - Rice straws - Starch-based - Thickness swelling
Classification code:445.1 Water Treatment Techniques - 801.2 Biochemistry - 804.1 Organic Compounds - 821.5 Agricultural Wastes - 931.2 Physical Properties of Gases, Liquids and Solids - 951 Materials Science
DOI:10.3969/j.issn.1002-6819.2012.06.047
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 39>
Accession number:20121314899955
Title:Spatial variability of soil moisture on aeolian sandy land in riparian ecotone of middle reaches of Yarlung Zangbo River valley
Authors:Li, Haidong (1); Shen, Weishou (1); Lin, Naifeng (1); Yuan, Lei (1); Sun, Ming (1); Ji, Di (1)
Author affiliation:(1) Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China
Corresponding author:Shen, W.(shenweishou@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:150-155
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:Soil moisture content is one of the restrictive factors of natural vegetation succession and artifical vegetation restoration in the alpine valley in Tibet. The purpose of this study is to characterize the distribution of soil moisture on different aeolian sandy land types, and to make inferences to guide the ongoing vegetation reconstruction. Taking aeolian sandy land in the riparian ecotone of the middle reaches of the Yarlung Zangbo River valley as a case study, geo-statistical and GIS methods were conducted to examine the spatial variability and vertical characteristics of soil moisture on. The results showed: 1) the mean soil moisture content at different depths on aeolian sandy land was from 6.14% to 14.20%, and decreased with the increasing depth of humid soil layer. The spatial variability of soil moisture was the strong variability; 2) Soil moisture content had a strong spatial correlation in the layer of 0-20 cm and a moderate spatial correlation in other layers. The spatial correlation decreased with the soil depth increased. The spatial distribution pattern of soil moisture between different soil depths had a significant similarity, and the highest was between 20-40 cm and 40-60 cm; and 3) The soil moisture content varies with the micro-topograhpy, sandy land on flood plain > windward aspect > leeward aspect > sandy gravel land > top of sand dunes. The variations of water level, micro-topography and aeolian sand movement are the main factors to determine the differentiations of soil moisture content between different types of sandy land and parts of moving sand dunes.
Number of references:21
Main heading:Soil moisture
Controlled terms:Geographic information systems - Interpolation - Landforms - Moisture determination - Vegetation - Water levels
Uncontrolled terms:Aeolian sand - Aeolian sandy land - Alpine valleys - Flood plains - Micro topography - Natural vegetation - River valley - Sand dunes - Sandy gravel - Soil depth - Soil layer - Spatial correlations - Spatial distribution patterns - Spatial variability - Tibetan Plateau - Vegetation restoration
Classification code:944.2 Moisture Measurements - 921.6 Numerical Methods - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 723.3 Database Systems - 614.2 Steam Power Plant Equipment and Operation - 483.1 Soils and Soil Mechanics - 481.1 Geology
DOI:10.3969/j.issn.1002-6819.2012.06.025
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 40>
Accession number:20121314899936
Title:Optimization experiments on electromagnetic vibrated seeder of rice bud-seed for field seedling raising
Authors:Yang, Jian (1); Yang, Wang (1); Wang, Gaofeng (1); Li, Junlin (1)
Author affiliation:(1) College of Mechanical Engineering of Guangxi University, Nanning 530004, China; (2) Guangxi Key Laboratory of Manufacturing System and Advanced Manufacturing Technology, Nanning 530004, China
Corresponding author:Yang, J.(yangokok@gxu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:6
Issue date:March 15, 2012
Publication year:2012
Pages:32-38
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:In order to study the influence law of electromagnetic vibrated seeder for field seedling raising of rice bud-seed's performance and obtain the optimal combination of parameters, single factor and multi-factor experiments were carried out on seeder for field seedling raising of rice bud-seed. The relationship of the four influencing factors (opening height of retaining plate, walking speed, vibration velocity of seed plate and stiffness of vibration isolating rubber pad) and seeding quantity and seeding pass rate were established respectively by regression analysis. The influence law and mechanism of the factors and their interaction were analyzed, and the respective optimization of the parameters was obtained. The results showed that: opening height of retaining plate is less than 7mm, blocking phenomenon was serious; when opening height of retaining plate and vibration velocity of seed plate was big, seeding quantity and the pass rate of seeding was high, and when walking speed was large, seeding quantity and pass rate of seeding was low; combination of small walking speed and large vibration velocity of seed plate was beneficial to improve pass rate of seeding. Optimal combination of parameters was achieved under the condition that opening height of retaining plate was 9.3 mm, walking speed was 50.1 mm/s, vibration velocity of seed plate was 13.1 m/s, and stiffness of vibration isolating rubber pad was 1248.9 N/mm. The pass rate of seeding interval with 95% reliability was from 86.72% to 93.54%. This paper provides a foundation for optimization design of seeder.
Number of references:15
Main heading:Vibrations (mechanical)
Controlled terms:Agricultural machinery - Electromagnetism - Experiments - Optimization - Regression analysis - Rubber - Speed - Stiffness - Velocity
Uncontrolled terms:Blocking phenomenon - Electromagnetic vibratory - Field seedling raising - Influencing factor - Large vibrations - Multi-factor - Optim