<RECORD 1>

Accession number:20124415631087
Title:Farmer cognition on water-saving irrigation technology and its influencing factors analysis
Authors:Huang, Yuxiang (1); Han, Wenting (2); Zhou, Long (1); Liu, Wenshuai (1); Liu, Jundi (4)
Author affiliation:(1) College of Mechanical and Electronic Engineering, Northwest Agriculture and Forestry University, Yangling 712100, China; (2) Institute of Water Saving Agriculture in Area Regions of China, Northwest Agriculture and Forestry University, Yangling 712100, China; (3) Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China; (4) College of Economics and Management, Northwest Agriculture and Forestry University, Yangling 712100, China
Corresponding author:Han, W.(hanwt2000@126.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:18
Issue date:September 15, 2012
Publication year:2012
Pages:113-120
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 analysis the driving forces of WSI technological choice and changing farmers' traditional irrigation methods, farmer cognition on water-saving irrigation (WSI) technology and their influencing factors were investigated. 296 households in 17 towns and 10 counties (districts) in Shaanxi province regarding greenhouse crop production were surveyed, and the farmer cognition and its influencing factors based on Structural Equation Modeling (SEM) were analyzed. The results indicated that the level of farmer cognition influenced the application and promotion of WSI technology directly. The effects of familiarity towards WSI equipment, the degree of satisfaction with existing irrigation methods, government subsidies, irrigation cost, education level, farmer's age, technical training experience and planting experience on farmer cognition on WSI technology. Thus, it can be used to prompt farmer cognition level on WSI, and regulate farmer irrigation behavior, promote adoption ratio of WSI technology, by improving farmers' rational cognition on traditional irrigation methods, expanding farmers' depth and the breadth towards WSI technology, enhancing government's macroeconomics regulation, control and supporting strength, establishing a consummate WSI technology extension system.
Number of references:26
Main heading:Factor analysis
Controlled terms:Economics - Irrigation - Sensory perception - Technical presentations - Technology - Water resources
Uncontrolled terms:Degree of satisfaction - Driving forces - Extension systems - Farmers - Government subsidies - Greenhouse crop production - Influencing factor - Influencing factors analysis - Irrigation costs - Irrigation methods  - Structural equation modeling - Structural equation models - Technical training - Traditional irrigation - Water-saving irrigation
Classification code:971 Social Sciences - 922.2 Mathematical Statistics - 901.2 Education - 901 Engineering Profession - 821.3 Agricultural Methods - 461.4 Ergonomics and Human Factors Engineering - 444 Water Resources
DOI:10.3969/j.issn.1002-6819.2012.18.017
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 2>

Accession number:20124415631082
Title:Effects of blade thickness on performance of axial flow pump and analysis of internal flow field
Authors:Sha, Yi (1); Hou, Liyan (2)
Author affiliation:(1) School of Mechanical and Automotive Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China; (2) Yantai Moon Co., Ltd., Yantai 264000, China
Corresponding author:Sha, Y.(shayi01@sina.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:18
Issue date:September 15, 2012
Publication year:2012
Pages:75-81
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to investigate the variable-thickness performance of blade in a axial flow pump, a QY90-4.4-1.5 submersible axial flow pump with specific speed 550 and rotate velocity 2900 r/min, especially its particular impeller and guide vane has been designed on the basis of arc method and streamline method. Based on experiments with increasing in leaf thickness, the reason about the difference among curves of q<inf>v</inf>-H, q<inf>v</inf>-P, q<inf>v</inf>-&eta; were studied. The three-dimensional internal flow with effect of impeller blade thickness within axial flow has been numerically simulated by CFD, both the relative velocity distribution on the optimal condition and static pressure distribution on the different condition of blade surface were obtained. It can be revealed that pump performance with thin blade was improved, but the anti-cavitation was reduced. It also can be showed that the situations of flow separation, backflow and secondary flow were more serious for the thick blades, which were the main reasons for the low efficiency of pump.
Number of references:25
Main heading:Pumps
Controlled terms:Axial flow - Computational fluid dynamics - Discharge (fluid mechanics) - Flow fields - Hydraulic models - Impellers
Uncontrolled terms:Arc method - Axial flow pump - Backflow - Blade Surface - Blade thickness - Guide vane - Impeller blades - Internal flow field - Internal flows - Leaf thickness  - Optimal conditions - Performance tests - Pump performance - Specific speed - Static pressure distributions - Stream-line methods - Thickness of blade - Thin blades
Classification code:407 Maritime and Port Structures; Rivers and Other Waterways - 601.2 Machine Components - 618.2 Pumps - 631 Fluid Flow - 632.1 Hydraulics
DOI:10.3969/j.issn.1002-6819.2012.18.012
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 3>

Accession number:20124415631078
Title:Experiment of vehicle localization based on polynomial Kalman filter
Authors:Zhao, Ruqi (1); Zhao, Zuoxi (1); Zhao, Ruzhun (1)
Author affiliation:(1) Key Laboratory of Key Technology on Agricultural Machine and Equipment, Ministry of Education, South China Agricultural University, Guangzhou 510642, China; (2) Center of Experimental Teaching for Common Basic Courses, South China Agricultural University, Guangzhou 510642, China
Corresponding author:Zhao, Z.(zhao_zuoxi@hotmail.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:18
Issue date:September 15, 2012
Publication year:2012
Pages:49-56
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 study the application of polynomial Kalman filter(PKF) in the vehicle location, and to analyze state estimation accuracy of PKF affected by the order of polynomial and evaluate the performance of the PKF, in this paper, by adopting polynomial fitting method in system model of kalman filter to model nonlinear system, three PKFs were established and applied for vehicle localizaiton experiment with mulitiple sensors fusion. Firstly, previous researches on PKF in tracking accuracy affected by the order of polynomial and in performance evaluation were introduced. Then, zero-order, first-order and second-order PKF were establish using corresponding order of polynomial to fit the longitudinal velocity and heading of encoder dead-reckon model. Experiment was conducted on Pioneer3-AT moble robot platform with Encoder and AHRS used as sensor data input, measurement of RTK-GPS was as reference trajectory. Also, the theorectical error and actual error of the PKF were compared to evaluate the performance of the three PKFs. The experiment result showed that the actual error of the three PKFs were within the theorectical error bounds in more than 68% filtering time which indicated normal status of the filters. The localization accuracy of zero-order PKF were increased by 63% and 73% in X, Y axis respectively compared with encoder dead-reckon method. Localization accuracy of first-order PKF was better than zero-order, and second-order was better than zero-order but worse than first-order, which showed that polynomial fitting the longitudinal velocity and heading of encoder dead-reckon model using higher order could not contribute to even better localization accuracy. This paper provides references for the construction and performance evaluation of PKF, as well as its practical implementation on vehicle localization.
Number of references:27
Main heading:Tracking (position)
Controlled terms:Algorithms - Error analysis - Experiments - Kalman filters - Location - Polynomials - Sensors - Vehicles
Uncontrolled terms:Actual error - Error bound - First-order - Fitting - Localization accuracy - Longitudinal velocity - Multiple sensor fusion - Performance evaluation - Polynomial fitting method - Polynomial fittings  - Practical implementation - Reference trajectories - Robot platform - RTK-GPS - Second orders - Sensor data - System models - Tracking accuracy - Vehicle localization - Vehicle location
Classification code:921 Mathematics - 912 Industrial Engineering and Management - 911 Cost and Value Engineering; Industrial Economics - 901.3 Engineering Research - 801 Chemistry - 731.1 Control Systems - 723 Computer Software, Data Handling and Applications - 716.2 Radar Systems and Equipment - 432 Highway Transportation
DOI:10.3969/j.issn.1002-6819.2012.18.008
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 4>

Accession number:20124415631102
Title:Land use changes after major function oriented zoning based on SLEUTH model
Authors:Qian, Min (1); Pu, Lijie (1); Zhu, Ming (1)
Author affiliation:(1) School of Geographic and Oceanographic Science, Nanjing University, Nanjing 210093, China; (2) School of Resource and Environment, Guizhou University, Guiyang 550003, China
Corresponding author:Pu, L.(ljpu@nju.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:18
Issue date:September 15, 2012
Publication year:2012
Pages:223-232
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:To provide feasible methods for solving region problems, a major function oriented zoning (MFOZ) method based on SLEUTH (slope, land use, exclusive layer, urbanization, transportation, hillshade) was proposed in this paper, which can adjust the MFOZ according to the tendency of land use change. Taking Suzhou-Wuxi region as research object, a typical rapid urbanization area, SLEUTH model was applied to simulate primary regionalization scenarios from 2009 to 2030, describing the land use change after MFOZ. Then ambiguous regions during the first zoning due to fuzzy conditions were adjusted and optimized and complete MFOZ in Suzhou-Wuxi region was obtained. The result showed that this method made MFOZ intuitively predicable and adjustable. Thus this method provides a technical supportive for reasonable implementation of MFOZ.
Number of references:31
Main heading:Land use
Controlled terms:Optimization - Zoning
Uncontrolled terms:Fuzzy conditions - Land-use change - Major function oriented zoning (MFOZ) - Research object - Suzhou-Wuxi region
Classification code:403 Urban and Regional Planning and Development - 921.5 Optimization Techniques
DOI:10.3969/j.issn.1002-6819.2012.18.032
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 5>

Accession number:20124415631100
Title:Preparation and release performance of polyacrylic acid grafted alkali lignin-based iron fertilizer
Authors:Ma, Yanli (1); Wang, Ruru (1); Fang, Guizhen (1); Li, Daqi (1)
Author affiliation:(1) Material Science and Engineering College, Northeast Forestry University, Harbin 150040, China; (2) Key Laboratory of Bio-Based Material Science and Technology, Ministry of Education, Harbin 150040, China
Corresponding author:Fang, G.
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:18
Issue date:September 15, 2012
Publication year:2012
Pages:208-214
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:To improve the cumulative release rate of iron, polyacrylic acid grafted alkali lignin-based (ALS-G-P (AA)) iron fertilizer was prepared by acrylic monomer grafted the amorphous alkali lignin. The influences on water absorbency of the materials to neutralization degree of acrylic acid, the dosage of initiator and cross-linking agent, temperature and grafting degree of alkali-lignin were investigated by orthogonal test. Release performance of ALS-G-P (AA) iron fertilizer was researched. The results showed the ideal preparation conditions were as follow: the degree of acrylic acid was 60%, amount of initiator was 0.06 g and the cross-linking agent was 0.03 g, temperature was 60&deg;C and alkali-lignin grafting was 25%. Water absorbency of ALS-G-P (AA) iron fertilizer was 1017 g/g, the iron content of which was 7.74 mg/g. Effective release period of water saturated ALS-G-P (AA) iron fertilizer with was 22 days. Iron cumulative released rate of ALS-G-P (AA) iron fertilizer in water fitted a quadric equation. Curve of the iron cumulative release rate was S pattern. The study provides a reference for the efficient application of iron fertilizer, and expanded application of the alkali lignin in agricultural fields of controlled release carriers.
Number of references:32
Main heading:Iron
Controlled terms:Acrylic monomers - Carboxylic acids - Crosslinking - Fertilizers - Grafting (chemical) - Lignin - Polymerization
Uncontrolled terms:Acrylic acids - Agricultural fields - Alkali lignin - Controlled release - Cross linking agents - Grafting degree - Iron content - Neutralization degree - Orthogonal test - Polyacrylic acids  - Preparation conditions - Release performance - Release rate - Slow release - Superabsorbent polymer - Water absorbency
Classification code:545.1 Iron - 802.2 Chemical Reactions - 804 Chemical Products Generally - 804.1 Organic Compounds - 815.1.1 Organic Polymers - 815.2 Polymerization
DOI:10.3969/j.issn.1002-6819.2012.18.030
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 6>

Accession number:20124415631097
Title:Regional differences of livestock and poultry breeding output in scale and policy suggestions during 2002-2009 in China
Authors:Fu, Qiang (1); Zhu, Yunqiang (2); Yang, Hongxin (4); Wu, Genyi (5); Yan, Lijie (6); Yang, Fei (2); Kong, Xiangsheng (3)
Author affiliation:(1) College of Environment and Planning, Henan University, Kaifeng 475004, China; (2) State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; (3) Institute of Computer and Information Engineering, Xinxiang University, Xinxiang 453003, China; (4) Department of Physics, Xinxiang University, Xinxiang 453003, China; (5) College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China; (6) Department of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China
Corresponding author:Zhu, Y.(zhuyq@lreis.ac.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:18
Issue date:September 15, 2012
Publication year:2012
Pages:185-191
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 regional differences of large scale livestock and poultry breeding in China, the standardized pig index from province-level data of Chinese animal industry yearbooks during 2002-2009 was used in present study. Then differences of internal and interval regions of China and their six regions were examined by Theil index method. The results showed that the large scale livestock and poultry breeding ascended during 2002-2009 in general, and the rising trend became more and more significant year by year. Period from 2002 to 2006 was the slow ascending period. During this period, the overall regional differences descended generally. Period from 2007 to 2009 was the rapid ascending period, and the overall regional differences ascended rapidly. During the whole period, the internal region difference was more significant than that of interval region. Meanwhile, based on the regional difference study, the development of large scale livestock and poultry breeding in China and the analysis of contribution rate of differences inside this region, the present research suggests that local governments in the six regions should take different policies for management of the livestock and poultry breeding industry.
Number of references:30
Main heading:Agriculture
Controlled terms:Animals - Information theory - Public policy - Statistical methods
Uncontrolled terms:Contribution rate - Livestock and poultry breeding in scale - Local government - Policy suggestions - Regional differences - Theil indices
Classification code:716.1 Information Theory and Signal Processing - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 922.2 Mathematical Statistics - 971 Social Sciences
DOI:10.3969/j.issn.1002-6819.2012.18.027
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 7>

Accession number:20124415631086
Title:Stochastic simulation of regional water requirement based on Copula function
Authors:Yang, Fengshun (1); Shao, Dongguo (1); Gu, Wenquan (1); Xiao, Chun (1); Tan, Xuezhi (1); Yang, Haidong (1)
Author affiliation:(1) State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
Corresponding author:Shao, D.(dgshao@whu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:18
Issue date:September 15, 2012
Publication year:2012
Pages:107-112
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 factors like socioeconomic development and climate, regional water requirement is random. In view of the fact that Copula function can be used to describe the autocorrelation of event series, stochastic simulation model of regional water requirement is established based on Copula function. This model could reflect the correlation between monthly water requirements, and overcome the disadvantage caused by the simulation of monthly water requirement independently. Taking the middle-lower reaches of Han River as study area, the availability of the proposed model is verified by the comparison between the results of the model and those of Cholesky model. Results suggested that the proposed model can preserve the statistical properties of the calculated data series, especially the skewness coefficient and correlation coefficient, and provide a new way for regional water requirement simulation.
Number of references:31
Main heading:Computer simulation
Controlled terms:Distribution functions - Stochastic models - Water resources
Uncontrolled terms:Cholesky - Copula functions - Correlation coefficient - Data series - Han river - Skewness coefficients - Socio-economic development - Statistical properties - Stochastic simulation model - Stochastic simulations  - Study areas - Water requirements
Classification code:444 Water Resources - 723.5 Computer Applications - 922.1 Probability Theory
DOI:10.3969/j.issn.1002-6819.2012.18.016
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 8>

Accession number:20124415631098
Title:Soil respiration and its affecting factors in dry-land maize field under different tillage systems
Authors:Zhang, Junli (1); Tanveer, Sikander Khan (1); Wen, Xiaoxia (1); Chen, Yuexing (1); Gao, Mingbo (1); Liu, Yang (1); Liao, Yuncheng (1)
Author affiliation:(1) College of Agronomy, Northwest Agriculture and Forestry University, Yangling 712100, China
Corresponding author:Liao, Y.(yunchengliao@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:18
Issue date:September 15, 2012
Publication year:2012
Pages:192-199
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:To explore the effects of different tillage systems on soil reparation during the summer maize crop growing season, the tillage systems included deep tillage (DT), no tillage (NT), rotary tillage (RT) and plow tillage (PT) was designed. The soil respiration, its affecting factors and the relationship of soil respiration rate with soil moisture, soil temperature, soil organic matter, total nitrogen and soil pH was elucidated. The results indicated that soil respiration rate was first increased then decreased during the whole crop period in all kinds of tillage systems. The maximum of soil respiration rate was DT, followed by PT, RT, NT. Soil temperature of PT was the highest, followed by DT, RT, NT from seeding to jointing stage; that of NT was the highest, followed by RT, DT, PT from tasseling to maturity stage. Soil organic matter, and Total nitrogen were gradually increased from planting to flowering stage, those of PT.was higher than those of NT. Soil pH value were significantly different during the growth stages, that of PT was the maximum, followed by RT, NT, DT. Soil moisture and soil temperature were significant correlated with soil respiration (P&gt;0.05). DT and PT were significantly correlated with soil moisture and soil temperature; soil organic matter were negatively correlated with soil respiration rate, and similarly significantly negative correlation was recorded between soil organic matter contents of DT and soil respiration rate. The negative correlations (P&gt;0.05) were recorded between total nitrogen and soil pH value for soil respiration under DT, RT, PT. The study provides a guideline for the complement of soil respiration and emission mechanism, the assessment of regional carbon input and output balance, and the establishment of feasible soil carbon regulation.
Number of references:25
Main heading:Agricultural machinery
Controlled terms:Biogeochemistry - Biological materials - Carbon - Cultivation - Nitrogen - Organic compounds - pH - Soil moisture - Soils - Temperature
Uncontrolled terms:Affecting factors - Aid farming land - Soil respiration - Summer maize - Tillage system
Classification code:821.3 Agricultural Methods - 821.1 Agricultural Machinery and Equipment - 804.1 Organic Compounds - 804 Chemical Products Generally - 801.2 Biochemistry - 801.1 Chemistry, General - 641.1 Thermodynamics - 483.1 Soils and Soil Mechanics - 461.2 Biological Materials and Tissue Engineering
DOI:10.3969/j.issn.1002-6819.2012.18.028
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 9>

Accession number:20124415631101
Title:Suitability evaluation and consolidation division of rural residential areas in villages and towns
Authors:Kong, Xuesong (1); Liu, Yaolin (1); Deng, Xuankai (1); Luo, Ti (1)
Author affiliation:(1) School of Resource and Environment Science, Wuhan University, Wuhan 430079, China; (2) Key Laboratory of Geographic Information System, Ministry of Education, Wuhan University, Wuhan 430079, China
Corresponding author:Liu, Y.
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:18
Issue date:September 15, 2012
Publication year:2012
Pages:215-222
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:Suitability evaluation of rural residential areas is the basis of land consolidation division. Taking Yuyue town and Guanqiao town as cases, the suitability evaluation indexes of rural residential areas were established based on three factors of nature, society and economy, ecology, and quantitative system and characterization of indexes were analyzed. The consolidation division of rural residential areas was realized by coordinating rural-urban development and suitability classification. The results showed that the difference of suitability was apparent between Yuyue and Guanqiao, and the suitability of rural residential areas in Yuyue town was higher than that of Guanqiao town. Converting from rural residential areas into town land should be regarded as key consolidation way in Yuyue town, while spatial migration for scattered rural residential areas was the main way in Guanqiao town. Consolidation areas and planning areas were well organized based on spatial integration among different division areas, which can provide decisive support for rural residential land consolidation.
Number of references:27
Main heading:Rural areas
Controlled terms:Classification (of information) - Economics - Land use - Remediation - Urban growth
Uncontrolled terms:Quantitative systems - Residential areas - Spatial migration - Suitability evaluation - Villages and towns
Classification code:403 Urban and Regional Planning and Development - 403.1 Urban Planning and Development - 454.2 Environmental Impact and Protection - 716.1 Information Theory and Signal Processing - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 971 Social Sciences
DOI:10.3969/j.issn.1002-6819.2012.18.031
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 10>

Accession number:20124415631083
Title:Simulation study on freeze-thaw damage of hydraulic concrete in construction period
Authors:Guo, Lixia (1); Luo, Guojie (1); Zhong, Ling (1); Chen, Shoukai (1)
Author affiliation:(1) North China University of Water Conservancy and Electric Power, Zhengzhou 450011, China
Corresponding author:Guo, L.(guolx@126.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:18
Issue date:September 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:During the long construction of hydraulic concrete, frost heave is one of the key factors which can result in concrete crack. Based on the previous studies and the analysis on freeze-thaw characteristics of concrete, new models for predicting elasticity coefficient and tensile strength with changes of age and freezing times were proposed. With the application of the 3-d finite element program, the process of frost heave damaging of concrete during construction period were simulated. Results showed that the calculated results had a good coincidence with the actual rules of crack. This research provides a useful reference for concrete projects.
Number of references:23
Main heading:Freezing
Controlled terms:Computer simulation - Concrete construction - Construction - Design - Elasticity
Uncontrolled terms:Concrete cracks - Construction period - During construction - Elasticity coefficients - Finite element programs - Freeze-thaw - Freeze-thaw damage - Frost heave - Hydraulic concrete - Simulation studies
Classification code:405 Construction Equipment and Methods; Surveying - 408 Structural Design - 421 Strength of Building Materials; Mechanical Properties - 422 Strength of Building Materials; Test Equipment and Methods - 723.5 Computer Applications - 822.2 Food Processing Operations
DOI:10.3969/j.issn.1002-6819.2012.18.013
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 11>

Accession number:20124415631096
Title:Relevance of hyperspectral image feature to catalase activity in eggplant leaves with grey mold disease
Authors:Xie, Chuanqi (1); Feng, Lei (1); Feng, Bin (2); Li, Xiaoli (1); Liu, Fei (1); He, Yong (1)
Author affiliation:(1) College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China; (2) National Agriculture Exhibition Center, Beijing 100026, China
Corresponding author:Feng, L.(Lfeng@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:18
Issue date:September 15, 2012
Publication year:2012
Pages:177-184
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:Hyperspectral imaging feature of catalase activity in eggplant leaves stressed by grey mold was researched. Hyperspectral imagings of healthy, slight, moderate and heavy infected eggplant leaves were obtained by hyperspectral imaging system across the wavelength region of 400-100 nm and diffuse spectral response of objects from hyperspectral imaging was extracted by ENVI software. Then, different preprocessing methods were used to improve the signal noise ratio (SNR) including smoothing, median filter and normalization et al. The models of hyperspectral imaging response and catalase activity were built by the partial least squares regression (PLSR), least squares support vector machines (LS-SVM) and BP neural network (BPNN). The first two latent variables suggested by PLSR model can qualitatively distinguish healthy, slight, moderate and heavy infected eggplant leaves, the coefficient of determination (R²) of BPNN model built by the nine latent variables recommended by PLSR model is 0.8930 and the root mean square error of prediction (RMSEP) is 2.17&times;10³. It demonstrated that catalase activity in eggplant leaves can be effectively detected and disease degree of eggplant leaves stressed by grey mold can also be effectively distinguished by the hyperspectral imaging technique.
Number of references:26
Main heading:Spectroscopy
Controlled terms:Image recognition - Imaging techniques - Mean square error - Models - Molds - Neural networks - Support vector machines
Uncontrolled terms:BP neural networks - Catalase - Catalase activity - Coefficient of determination - Eggplant - Grey mold - Hyper-spectral images - HyperSpectral - Hyperspectral Imaging - Hyperspectral imaging systems  - Latent variable - Least squares support vector machines - Partial least-squares regression - Pre-processing method - Root-mean-square error of predictions - Signal-noise ratio - Spectral response - Wavelength regions
Classification code:902.1 Engineering Graphics - 816.2 Plants and Machinery for Plastics and Other Polymers - 801 Chemistry - 746 Imaging Techniques - 741 Light, Optics and Optical Devices - 731.1 Control Systems - 723.4 Artificial Intelligence - 723 Computer Software, Data Handling and Applications - 716 Telecommunication; Radar, Radio and Television
DOI:10.3969/j.issn.1002-6819.2012.18.026
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 12>

Accession number:20124415631080
Title:Effects of proportions of biodiesel/diesel blends on structures of diesel engine particulates
Authors:Ma, Zhihao (1); Zhang, Xiaoyu (2); Ma, Fanhua (3); Duan, Junfa (1); Xu, Bin (2); Wu, Jian (2)
Author affiliation:(1) Key Lab. of Clean Energy Engine and Engineering Vehicles, North China University of Water Resource and Electric Power, Zhengzhou 450011, China; (2) College of Vehicle and Motive Power Engineering, Henan University of Science and Technology, Luoyang 471003, China; (3) State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
Corresponding author:Ma, Z.(mazhihao@mail.haust.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:18
Issue date:September 15, 2012
Publication year:2012
Pages:64-68
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to study the effects of engine loads and proportions of biodiesel/diesel blends on the particulate emissions, morphology and microstructure of particulates emitted from an electronic controlled high pressure common rail diesel engine were investigated by using HRTEM under the two operating conditions of rotation speed at 2000 r/min and torque at 75 N&middotm and 2000 r/min and 225 N&middotm, and four kinds of proportions of biodiesel/diesel blends (B0, B10, B50 and B100). The results indicated that the primary particles generated only by B100 present irregular shape and very different particle sizes. However, the spherical primary particles consisting of the soot generated by the other fuels are typically monodisperse. The primary particles have multilayer graphite-like microcrystal structure. There exists torsion and translation between the carbon lamella. Disordered core zone is inside the primary particle. Under the operating condition of 2000 r/min and 225 N&middotm, the mean diameter of primary particle for B100 was 45.57 nm and very different from the other three fuels. Engine loads and proportions of biodiesel/diesel in the blends which were lower than 50% have little influence on the mean diameter of primary particle. The results can provide references for the formation mechanisms of diesel particulates and the design of after-treatment system.
Number of references:21
Main heading:Diesel engines
Controlled terms:Fuels - Particulate emissions
Uncontrolled terms:After-treatment - Core zones - Diesel particulate - Engine load - Formation mechanism - High pressure common rail diesel engine - HRTEM - Irregular shape - Mean diameter - Monodisperse  - Operating condition - Particulate - Primary particles - Rotation speed
Classification code:451.1 Air Pollution Sources - 522 Gas Fuels - 523 Liquid Fuels - 524 Solid Fuels - 612.2 Diesel Engines
DOI:10.3969/j.issn.1002-6819.2012.18.010
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

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Accession number:20124415631077
Title:Relationship between steering power ratio and turning coefficient of tracked vehicle adopting differential steering mechanism
Authors:Chi, Yuan (1)
Author affiliation:(1) Engineering College, Northeast Agricultural University, Harbin 150030, China
Corresponding author:Chi, Y.(cy207@126.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:18
Issue date:September 15, 2012
Publication year:2012
Pages:44-48
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 engine power increases for tracked vehicle adopting differential steering mechanism in hydro-mechanical double-power driving system, the steering power ratio, turning coefficient and the relationship between them were theoretically studied. Compared with steering power ratio and turning coefficient radials (&xi;-&upsilon;) of the other steering mechanisms, the power increasing rate was analyzed. The prototype was tested and the relationship between steering power ratio and turning coefficient was acquired through experiment and calculation. &xi;-&upsilon; radials was acquired according to the experiment data. The turning performance of the differential steering mechanism was evaluated according to the study results. This research provides a reference for the advanced study on hydro-mechanical double-power driving system adopting differential steering mechanism for tracked vehicle.
Number of references:21
Main heading:Automobile steering equipment
Controlled terms:Experiments - Steering - Tracked vehicles - Vehicles
Uncontrolled terms:Coefficient - Differential steering mechanism - Driving systems - Engine power - Experiment data - Hydro-mechanical - Loads - Power increasing rate - Power ratio - Steering mechanisms  - Turning performance
Classification code:432 Highway Transportation - 663 Buses, Tractors and Trucks - 663.2 Heavy Duty Motor Vehicle Components - 901.3 Engineering Research
DOI:10.3969/j.issn.1002-6819.2012.18.007
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

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Accession number:20124415631099
Title:Spatial variability of groundwater nitrate-nitrogen and cause analysis of its pollution for irrigation area with reclaimed water
Authors:Yin, Shiyang (1); Wu, Wenyong (1); Liu, Honglu (1); Zhang, Xianquan (3)
Author affiliation:(1) Beijing Hydraulic Research Institute, Beijing 100048, China; (2) Beijing Eng. Tech. Res. Ctr. for Explor. and Utiliz. of Non-Conventional Water Rsrc., Beijing 100048, China; (3) Beijing Management Center of Hydraulic Engineering Construction, Beijing 100036, China
Corresponding author:Yin, S.(yinshiyang@yahoo.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:18
Issue date:September 15, 2012
Publication year:2012
Pages:200-207
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 analysis the spatial distribution of groundwater nitrate-nitrogen and its pollution causes of reclaimed water irrigation region in Beijing, based on geostatistics model and geostatistical analyst module of ArcGIS. The spatial distribution maps of groundwater nitrate-nitrogen and semi-variogram function was proposed, which represented the probability and structural characteristics. The results showed that the groundwater nitrate-nitrogen satisfied log normal distribution and one-order Gaussian model can capture the characteristics well in the reclaimed water irrigation region. The prediction of distance statistical correlation of groundwater nitrate-nitrogen was 9639.36 m, and the distance between two sampling sits should be smaller than this value. The nugget effect value was 0.43, which implied that nitrate-nitrogen concentration distribution was controlled by structural factors and human activity. Land use style and groundwater withdrawal intensity directly influenced the probability of groundwater nitrate-nitrogen pollution. The depth of monitoring wells was smaller, the decline of groundwater level was greater, the increase in groundwater nitrate-nitrogen was greater. The risk of nitrate-nitrogen pollution of groundwater caused by accumulated areas of reclaimed water maintained low. The study provides a reference for quantifying the groundwater pollution risk and security of wastewater utilization in agriculture.
Number of references:37
Main heading:Groundwater pollution
Controlled terms:Groundwater - Irrigation - Nitrates - Nitrogen - Normal distribution - Pollution - Reclamation - Spatial distribution
Uncontrolled terms:Concentration distributions - Gaussian model - Geo-statistics - Geostatistical - Groundwater withdrawal - Human activities - Irrigation area - Log-normal distribution - Monitoring wells - Nitrate nitrogen  - Nugget-effect - Re-claimed water - Semivariograms - Spatial distribution map - Spatial variability - Statistical correlation - Structural characteristics - Structural factor
Classification code:921 Mathematics - 821.3 Agricultural Methods - 804.2 Inorganic Compounds - 922.1 Probability Theory - 804 Chemical Products Generally - 452.4 Industrial Wastes Treatment and Disposal - 444.2 Groundwater - 454.2 Environmental Impact and Protection
DOI:10.3969/j.issn.1002-6819.2012.18.029
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

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Accession number:20124415631081
Title:Hydraulic characteristics of swirling fluidized-sand biofilter
Authors:Zhang, Haigeng (1); Wu, Fan (1); Zhang, Yulei (1); Song, Benben (1); Song, Hongqiao (1); Ni, Qi (1)
Author affiliation:(1) Laboratory of Fishery Equipment and Engineering, Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200092, China
Corresponding author:Wu, F.(wufan@fmiri.ac.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:18
Issue date:September 15, 2012
Publication year:2012
Pages:69-74
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 evaluate the working performance of fluidized sand biofilter, and determine the optimal design parameter, a swirling fluidized-sand was designed, which used quartz sand as media. This paper discussed the effect of size and initial thickness of sand bed on the fluidizing performance. Double factor test was designed with different ranges of quartz sand (0.18 to 0.25, &gt;0.25 to 0.425 and &gt;0.425 to 0.6 mm) and different initial thickness of sand bed (40, 50, 60, 70, 80 and 90 cm). The results showed that the minimum fluidization velocities in three groups of different sizes range for quartz were (0.061&plusmn;0.0088) cm/s, (0.25&plusmn;0.011) and (0.48&plusmn;0.014) cm/s, respectively. To keeping sand bed at optimum fluidized state, the ratios of initial thickness of sand bed to the diameter of circular vessel should be greater than 1.43, 1.78 and 2.14, respectively, and the ratio was proportional to the size of quartz sand. The superficial velocity remained constant, while the initial thickness of sand bed increased at the same expansion ratio state. The pressure drop test showed that the pressure drop values per unit sand bed thickness for different sizes of quartz sand were (7530.66&plusmn;215.98), (6925.66&plusmn;364.58) and (6790.08&plusmn;277.95) Pa/m, respectively. The measured value was close to the theoretical value under the condition of quartz sand with 0.18 to 0.25 mm, and error was 2% to 3%. Based on Ergun equation, the mathematical model of minimum fluidization velocity was proposed according to the measured value by regression method, and it can provide a technical basis for the design and application of fluidized-sand biofilter.
Number of references:25
Main heading:Sand
Controlled terms:Biofilters - Buoyancy - Fluidization - Fluidized beds - Mathematical models - Pressure drop - Quartz - Velocity
Uncontrolled terms:Critical fluidization velocity - Design and application - Different sizes - Ergun equation - Expansion ratio - Hydraulic characteristic - Initial thickness - Minimum fluidization velocity - Optimal design parameters - Per unit  - Quartz sand - Regression method - Sand biofilter - Sand-beds - Superficial velocity - Surface velocity - Theoretical values
Classification code:921 Mathematics - 802.3 Chemical Operations - 802.1 Chemical Plants and Equipment - 931.1 Mechanics - 631 Fluid Flow - 482.2 Minerals - 452 Municipal and Industrial Wastes; Waste Treatment and Disposal - 505 Mines and Mining, Nonmetallic
DOI:10.3969/j.issn.1002-6819.2012.18.011
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

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Accession number:20124415631103
Title:Ecological and landscape design of farmland shelterbelt in land consolidation
Authors:Liu, Wenping (1); Yu, Zhenrong (1); Yun, Wenju (2); Xiao, He (1); Zhang, Qian (1)
Author affiliation:(1) Department of Ecology and Engineering, College of Resources and Environmental Sciences, China Agriculture University, Beijing 100193, China; (2) Centre of Land Consolidation, Ministry of Land and Resource, Beijing 100035, China
Corresponding author:Yu, Z.(yuzhr@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:18
Issue date:September 15, 2012
Publication year:2012
Pages:233-240
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 quick and effective improvement of farmland shelterbelts has become an urgent task for ecological landscape design in land consolidation. On the basis of field investigation, the spatial arrangement and composition of present shelterbelts were determined in farmlands in this study. Major parameters of the shelterbelts like porosity, effective protection distance and ground area were analyzed and important functional areas and landscape structures including advantage landscape space, landscape node, important landscape axis, were identified in the experimental area. A new shelterbelt system based on ecological landscape process was designed, which could much better support the ecological functions of the investigated landscape. The new design included an improved plant composition and structure, and minimized the required land area for the construction of shelterbelts. The results of this study showed that a careful shelterbelt design, which also considered present landscape features and was inherent ecological processes, achieved an effective improvement of deteriorated farmlands. This research provides methods to design ecological landscape of farmland shelterbelt in land consolidation.
Number of references:28
Main heading:Farms
Controlled terms:Consolidation - Design - Ecology - Land use - Planning - Plants (botany)
Uncontrolled terms:Ecological design - Ecological functions - Ecological process - Farmland shelterbelt - Field investigation - Functional areas - Ground area - Land areas - Landscape design - Landscape feature  - Landscape structures - New design - Plant composition - Spatial arrangements
Classification code:403 Urban and Regional Planning and Development - 408 Structural Design - 454.3 Ecology and Ecosystems - 461.9 Biology - 483 Soil Mechanics and Foundations - 821 Agricultural Equipment and Methods; Vegetation and Pest Control
DOI:10.3969/j.issn.1002-6819.2012.18.033
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

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