<RECORD 1> Accession number:20120314688260 Title:Design and experiment of friction vertical plate precision seed-metering device Authors:Wang, Yecheng (1); Qiu, Lichun (1); Zhang, Wenjiao (2); Li, Qichao (2) Author affiliation:(1) College of Engineering, Shenyang Agricultural University, Shenyang 110866, China; (2) College of Engineering, Northeast Agricultural University, Harbin 150030, China Corresponding author:Qiu, L.(qlccn@126.com) Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering Abbreviated source title:Nongye Gongcheng Xuebao Volume:28 Issue:1 Issue date:January 1, 2012 Publication year:2012 Pages:22-26 Language:Chinese ISSN:10026819 CODEN:NGOXEO Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China Abstract:In order to solve the problems of low dropping limit velocity and small filling power, a new type of friction plate precision seed-metering device was devised, and the force and movement mechanism of seeds were analyzed in the course of filling seeds space. The seeds were driven to flow by the friction on the friction plate, and the filling power increased as well as the efficiency was improved. The new device was tested on test bench and the result indicated that when the plant spacing was 10 cm, seedbed belt speed was 10.1 km/h, the limited speed of seed plate reached to 0.66m/s, and the qualification index was higher than 95%, overlapping seeding index was lower than 5% and missing seeding index was lower than 5%. It is shown that the seed meter is suitable for high-speed and accurate sowing. Number of references:15 Main heading:Seed Controlled terms:Agricultural machinery - Agriculture - Curricula - Experiments - Filling - Friction - Machine design - Pneumatic materials handling equipment - Tribology Uncontrolled terms:Dropping frequent - Friction plate - High-speed - Limit velocity - Movement mechanism - New devices - Plant spacing - Seed-metering device - Test benches - Vertical plate Classification code:931 Classical Physics; Quantum Theory; Relativity - 901.3 Engineering Research - 901.2 Education - 931.1 Mechanics - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 691.1 Materials Handling Equipment - 601 Mechanical Design - 691.2 Materials Handling Methods DOI:10.3969/j.issn.1002-6819.2012.01.005 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 2> Accession number:20120314688285 Title:Orthographic calibration of space-borne ALOS PALSAR microwave remote sensing image in mountain area Authors:Xu, Tianshu (1); Yue, Cairong (1); Zhang, Wangfei (1) Author affiliation:(1) Forest College, Southwest Forestry University, Kunming 650224, China Corresponding author:Xu, T. Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering Abbreviated source title:Nongye Gongcheng Xuebao Volume:28 Issue:1 Issue date:January 1, 2012 Publication year:2012 Pages:173-177 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 ortho-rectification of SAR (synthetic aperture radar) is difficult and a key step for its final application especially in mountain area. However, the method of the ortho-rectification of SAR is not available in the current remote sensing software. In this paper, the ortho-rectification of microwave remote sensing image was conducted based on GAMMA software platform and ALOS PALSAR basic data. Firstly, the simulated SAR image was generated by means of DEM (digital elevation model) and the satellite orbit parameter. Then, the registration offsets between the simulated SAR image and the real values were determined automatically using cross correlation analysis, and the polynomial models of these offsets were built accordingly. Finally, the true SAR image was resampled from the SAR with range and azimuth coordinates to one with the orthonormal map coordinates using a lookup table, which was generated by comparing the simulated and real SAR image and refined by the offsets registration polynomials. The accuracy of registration was tested by comparing with topographic map, and rectification errors were less than one pixel, which is less than 20 m. Number of references:19 Main heading:Synthetic aperture radar Controlled terms:Computer simulation - Electric rectifiers - Image processing - Image reconstruction - Maps - Remote sensing - Space optics - Surveying - Synthetic apertures - Table lookup Uncontrolled terms:ALOS PALSAR data - Cross-correlation analysis - Digital elevation model - Look up table - Microwave remote sensing - Ortho-rectification - Orthonormal - Polynomial models - Real values - SAR Images - SAR(synthetic aperture radar) - Satellite orbit - Software platforms - Space-borne - Topographic map Classification code:741 Light, Optics and Optical Devices - 731.1 Control Systems - 723.5 Computer Applications - 741.1 Light/Optics - 723.1 Computer Programming - 714.2 Semiconductor Devices and Integrated Circuits - 405.3 Surveying - 716.2 Radar Systems and Equipment DOI:10.3969/j.issn.1002-6819.2012.01.031 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 3> Accession number:20120314688302 Title:Combined drying technology of tilapia fillets using heat pump and microwave Authors:Guan, Zhiqiang (1); Zheng, Lijing (2); Li, Min (2); Guo, Shenglan (2) Author affiliation:(1) Guangdong University of Petrochemical Technology, Maoming 525000, China; (2) Engineering College, Guangdong Ocean University, Zhanjiang 524025, China Corresponding author:Guan, Z.(mmcgzq@163.com) Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering Abbreviated source title:Nongye Gongcheng Xuebao Volume:28 Issue:1 Issue date:January 1, 2012 Publication year:2012 Pages:270-275 Language:Chinese ISSN:10026819 CODEN:NGOXEO Document type:Journal article (JA) Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China Abstract:The technology of heat pump combined with microwave for drying Tilapia fillets was optimized by response surface method. Taking drying energy consumption and rehydration rate as dependent variable, the models were obtained by using response surface analysis of the three factors of temperature of heat pump drying, water content rate and power of microwave drying at three levels. The results of test and verification showed that all of the error between the value of models and the value of experiments was less than 5%. Base on the minimum of energy consumption, the optimized technology parameters were that the temperature of heat pump drying was 34.34°C, the water content rate at transformation point was 42.12% and the power of microwave drying was 131.69 W, respectively. Base on the maximum of rehydration rate, the optimized technology parameters were that the temperature of heat pump drying was 33.87°C, the water content rate at transformation point was 30% and the power of microwave drying was 201.43 W, respectively. Comparing the test result of heat pump combined with microwave at drying temperature of heat pump of 35°C, the water content rate at transformation point of 39% and microwave power of 252 W with that of heat pump drying test at same temperature and wind speed, it showed that the time of combination drying was shorter two-thirds than the heat pump drying. The rehydration rate of the optimized combination drying was 57.40%, and that of the heat pump drying was 39.16% at the same rehydration time of 40 min. The results also showed the rehydration rate of combined drying was increased by 46.5% compared with that of heat pump drying. The results can provide references for drying tilapia fillets of the combined heat pump with microwave drying technology. Number of references:16 Main heading:Drying Controlled terms:Energy storage - Energy utilization - Heat pump systems - Microwave heating - Microwaves - Optimization - Pumps - Surface analysis - Technology Uncontrolled terms:Combination drying - Combined heat - Dependent variables - Drying energy consumption - Drying technology - Drying temperature - Heat pump - Heat pump drying - Heat pumps - Microwave drying - Microwave power - Rehydration time - Response surface analysis - Response surface method - Technology parameters - Tilapia fillets - Wind speed Classification code:951 Materials Science - 921.5 Optimization Techniques - 901 Engineering Profession - 711.1 Electromagnetic Waves in Different Media - 711 Electromagnetic Waves - 702 Electric Batteries and Fuel Cells - 642.1 Process Heating - 641.2 Heat Transfer - 618.2 Pumps - 525.3 Energy Utilization - 423 Non Mechanical Properties and Tests of Building Materials DOI:10.3969/j.issn.1002-6819.2012.01.048 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 4> Accession number:20120314688269 Title:Some problems of water flow pattern and compensation mechanism for micro-irrigation emitters Authors:Zhang, Guoxiang (1); Ding, Sujiang (1) Author affiliation:(1) Xinjiang Hongke Water saving Equipment Manufacture Co-Operative Limited Company, Urumqi 830000, China Corresponding author:Zhang, G.(zhguox928@sina.cn) Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering Abbreviated source title:Nongye Gongcheng Xuebao Volume:28 Issue:1 Issue date:January 1, 2012 Publication year:2012 Pages:78-81 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:Hydraulic calculation of micro-irrigation emitters is important for pipeline engineering design. Classified basis of water flow pattern and the flow condition of pressure pipes, the differences of the operating head of drip emitters and frictional head loss flow modification, and water temperature modification of dripper discharge were studied. Then the reason for flow stance index x < 0.5 observed in hydraulic measured data of inelasticity elements was analyzed, and the method of area compensation was proposed. Results show that: 1) it's wrong that the water flow pattern in pressure pipes based on Nituradse's experimental results were applied in hydraulic calculation of micro-irrigation emitters except for microtubule drippers; 2) water temperature modification of drippers should be done for flow stance index x=1, not for x &le 0.5 not because flow state is at drag square area but because loss of pipes are presented as local loss and not for 1 > x > 0.5 respectively. The hydraulic relationship at different water temperature can be got by hydraulic experiments at corresponding water temperature for drippers of 1 > x > 0.5; 3) the way of classifying water flow pattern of drippers should be abandoned because this way just suitable for microtubule drippers cannot be applied for others; and 4) the reason for x < 0.5 of is area compensation effect, which means the area of passage decreased with water head increased, because of rapid changes for flow channel boundary and a positive correlation between the flow inertia and the water head. Number of references:5 Main heading:Irrigation Controlled terms:Compensation (personnel) - Flow of water - Flow patterns - Hydraulics - Pipe - Temperature Uncontrolled terms:Compensation effects - Compensation mechanism - Drip emitter - Flow - Flow channels - Flow condition - Flow inertia - Flow state - Frictional head loss - Hydraulic calculations - Local loss - Measured data - Microirrigation - Microtubules - Pipeline engineering design - Positive correlations - Pressure pipes - Rapid changes - Water flows - Water heads - Water temperature modification - Water temperatures Classification code:912.4 Personnel - 821.3 Agricultural Methods - 641.1 Thermodynamics - 632.1 Hydraulics - 631.1.1 Liquid Dynamics - 631.1 Fluid Flow, General - 619.1 Pipe, Piping and Pipelines DOI:10.3969/j.issn.1002-6819.2012.01.015 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 5> Accession number:20120314688304 Title:Identification of senescence related protease in tomato (Lycopersicum esculentum Mill.) fruit Authors:Sun, Jing (1); Shen, Jin (1); Cheng, Qinyang (1); Jiang, Weibo (2); Liu, Qing (1) Author affiliation:(1) Chinese academy of Agricultural Engineering, Beijing 100125, China; (2) College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China Corresponding author:Sun, J.(cynthiasj@163.com) Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering Abbreviated source title:Nongye Gongcheng Xuebao Volume:28 Issue:1 Issue date:January 1, 2012 Publication year:2012 Pages:282-286 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 find out the relationship between proteases and senescence, modified sodium dodecyl sulfate (SDS)-gelatin-polyacrylamide gel electrophoresis was exploited to analyze proteases activities of tomato (Lycopersicum esculentum Mill. cv. 918) fruit. Three proteases, named as SP-1, SP-2 and SP-3, respectively, were detected in red-ripe tomato fruit. All activities of these three proteases were changed during ripening and senescence. Followed by ethylene treatment, the activity of SP-2 was enhanced and the activities of SP-1 and SP-3 were showed up earlier. The opposite effects were observed by 1-methylcycloprop treatment. These results suggested that all SP-1, SP-2 and SP-3, regulated either by nature ripening or ethylene treatment, were senescence related proteases. The study provides reference for the relationship between proteases and senescence. Number of references:19 Main heading:Fruits Controlled terms:Electrophoresis - Energy storage - Enzymes - Ethylene - Proteins - Sodium - Sodium sulfate Uncontrolled terms:Ethylene treatment - Gel electrophoresis - Senescence - Sodium dodecyl sulfate - Tomato - Tomato fruits Classification code:549.1 Alkali Metals - 702 Electric Batteries and Fuel Cells - 801.3 Colloid Chemistry - 804.1 Organic Compounds - 804.2 Inorganic Compounds - 821.4 Agricultural Products DOI:10.3969/j.issn.1002-6819.2012.01.050 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 6> Accession number:20120314688258 Title:Test and analysis of wheat entrainment loss for tangential-longitudinal-axial combine harvester Authors:Tang, Zhong (1); Li, Yaoming (1); Zhao, Zhan (1); Xu, Lizhang (1); Li, Hongchang (1) Author affiliation:(1) Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education and Jiangsu Province, Jiangsu University, Zhenjiang 212013, China Corresponding author:Li, Y.(ymli@ujs.edu.cn) Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering Abbreviated source title:Nongye Gongcheng Xuebao Volume:28 Issue:1 Issue date:January 1, 2012 Publication year:2012 Pages:11-16 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 timely acquire the situation of entrainment losses of the tangential-longitudinal-axial combine harvester when it harvest in a field, an tangential-longitudinal-axial threshing-separating test bed was built in the laboratory, which was made up of a knife-type teeth tangential-axial drum, assistant feeding wheel and spike teeth longitudinal-axial drum of the tangential-longitudinal-axial combine harvester. The threshing-separating performance test was conducted with the test bed at the wheat feeding rate of 7 kg/s, the components and the distribution regularity of the threshed mixture were measured, the threshing-separating coefficient matrix was established and then threshing-separating matrix equation of threshing-separating device on the tangential-longitudinal-axial combine harvester was solved. The array PVDF (Polyvinylidene Fluoride) piezoelectric-film sensor was applied to measure the grain number of the 11th materials boxes location under spike-tooth longitudinal-axial drum of the tangential-longitudinal-axial combine harvester, the measured results were compared with the entrainment losses which was calculated by the threshing -separating matrix equation. The result showed that the their difference between the measured entrainment losses in the field and calculated values was -4.82%--5.87%.It has real-time monitor for grain entrainment losses in the field. Number of references:21 Main heading:Harvesters Controlled terms:Agriculture - Equipment testing - Grain (agricultural product) - Losses - Matrix algebra - Sensors - Testing Uncontrolled terms:Calculated values - Coefficient matrix - Combine harvesters - Distribution regularities - Feeding rate - Grain numbers - Matrix equations - Measured results - Performance tests - Polyvinylidene fluorides - Real-time monitor - Test and analysis - Threshing-separating Classification code:944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 943 Mechanical and Miscellaneous Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 941 Acoustical and Optical Measuring Instruments - 921.1 Algebra - 911.2 Industrial Economics - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 801 Chemistry - 423.2 Non Mechanical Properties of Building Materials: Test Methods DOI:10.3969/j.issn.1002-6819.2012.01.003 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 7> Accession number:20120314688297 Title:Evaluation for consolidation model of rural residential patches based on policy of linked change of rural-urban construction land Authors:Zhang, Xiaoping (1); Zhu, Daolin (1) Author affiliation:(1) College of Environmental Resources, China Agricultural University, Beijing 100193, China; (2) Faculty of Geomatics, East China Institute of Technology, Fuzhou 344000, China Corresponding author:Zhu, D.(dlzhu@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:1 Issue date:January 1, 2012 Publication year:2012 Pages:244-249 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:Consolidation of rural residential land was propelled greatly by the policy of linked change of rural-urban construction land. For guiding the work of consolidation of rural residential land, an evaluation procedure was established to list the types of consolidation model and choose the unit, and match the model with the unit subsequently. Based on the procedure, Bashan, a normal town in Chongren county, Jiangxi province, was taken as a case with the methods of overlay-operation and comprehensive evaluation. The results showed that there were four consolidation models of rural residential land in Bashan town, such as urban-rural integration model, ecological transfer model, relocation and merger model and inner optimization model. The areas under the models were 71.50, 2.67, 108.73 and 329.23 hm<sup>2</sup>, respectively. The patches of relocation and merger model were the main sources of reclamation, while the patches of urban-rural integration model and inner optimization model might be the resettled places for people lost their lands. The research on consolidation model of rural residential patch was connected with the policy of linked change of rural-urban construction land and would offer some decision support for the work of consolidation of rural residential land and the implementation of the policy. Number of references:16 Main heading:Merging Controlled terms:Consolidation - Decision support systems - Land use - Mathematical models - Models - Optimization - Relocation - Rural areas Uncontrolled terms:Bashan town - Comprehensive evaluation - Consolidation model - Construction land - Decision supports - Integration models - Jiangxi Province - Optimization models - Transfer models - Urban-rural Classification code:921 Mathematics - 902.1 Engineering Graphics - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 921.5 Optimization Techniques - 723 Computer Software, Data Handling and Applications - 483 Soil Mechanics and Foundations - 403 Urban and Regional Planning and Development - 619.1 Pipe, Piping and Pipelines DOI:10.3969/j.issn.1002-6819.2012.01.043 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 8> Accession number:20120314688294 Title:Change characteristics analysis of farmland in Northern Sanjiang Plain in 2000-2009 based on remote sensing Authors:Du, Guoming (1); Li, Yun (1); Yu, Fengrong (2); Zhang, Shuwen (3); Yang, Fenghai (1) Author affiliation:(1) Resources and Environmental Sciences School Northeast Agricultural University, Harbin 150030, China; (2) The Institute of Scientific and Technical Information, Heilongjiang Academy of Land Reclamation Region, Harbin 150036, China; (3) Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun 130012, China Corresponding author:Du, G.(nmgdgm@126.com) Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering Abbreviated source title:Nongye Gongcheng Xuebao Volume:28 Issue:1 Issue date:January 1, 2012 Publication year:2012 Pages:225-229 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 the remote sensing data, change characteristics of farmland at the Northern Sanjiang Plain in 2000-2009 was analyzed, aiming to provide the basis for land remediation, construction of farmland water conservancy, land resource development and utilization. The results showed that the area of farmland raised from 214.31 × 10<sup>4</sup> to 285.10 × 10<sup>4</sup> hm<sup>2</sup>. The reclamation ratio rose to 67.3% and the new increased land was drought land mainly. 73.64 × 10<sup>4</sup> hm<sup>2</sup> land was cultivated mainly from swamp, woodland and grassland, and the returning farmland area was only 2.84 × 10<sup>4</sup> hm<sup>2</sup>. At the same period, 58.67 × 10<sup>4</sup> hm<sup>2</sup> drought land changed to irrigated land and 9.06 × 10<sup>4</sup> hm<sup>2</sup> irrigated land changed to drought land. Irrigated land showed a pattern of concentrated distribution and the proportion of irrigated land accounted for 30.10% of the total area of farmland. More farmland increased in the east and north countries and less farmland increased in the west and south countries in the study area. Allocation optimization of water and land resources should be paid more attention in the process of agricultural development especially water conservancy construction in the future. Increasing the effective cultivated land area should be through land remediation firstly. Number of references:19 Main heading:Landforms Controlled terms:Agriculture - Drought - Farms - Land reclamation - Land use - Optimization - Remediation - Remote sensing - Water resources Uncontrolled terms:Agricultural development - Allocation optimization - Characteristics analysis - Cultivated land - Cultivated lands - Irrigated lands - Land remediation - Land resources - Remote sensing data - Sanjiang plain - Study areas - Water conservancy Classification code:921.5 Optimization Techniques - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 731.1 Control Systems - 481.1 Geology - 454.2 Environmental Impact and Protection - 444 Water Resources - 442.2 Land Reclamation DOI:10.3969/j.issn.1002-6819.2012.01.040 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 9> Accession number:20120314688273 Title:Evaluation of border irrigation performance based on spatial variability of infiltration parameters Authors:Nie, Weibo (1); Fei, Liangjun (1); Ma, Xiaoyi (2) Author affiliation:(1) Institute of Water Resources, Xi'an University of Technology, Xi'an 710048, China; (2) Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Ministry of Education, Northwest Agriculture and Forestry University, Yangling 712100, China Corresponding author:Nie, W.(nwbo2000@163.com) Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering Abbreviated source title:Nongye Gongcheng Xuebao Volume:28 Issue:1 Issue date:January 1, 2012 Publication year:2012 Pages:100-105 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:Objective evaluation on border irrigation performance is an essential basis to set up a proper irrigation scheme. Assumed that the soil characteristics spatial variability can be directly reflected from the changes of infiltration coefficient, taken the border irrigation experiments conducted in Yangling District with the clay loam and sandy loam as study objects, the effects of the soil characteristics spatial variability to irrigation performance were analyzed and the changes of irrigation performance of border irrigation were revealed. Results showed that irrigation efficiency, distribution uniformity and storage efficiency decreased with the infiltration variation coefficient increased. The decrease range of the irrigation application efficiency and storage efficiency was smaller respectively compared with that of distribution uniformity. Therefore the spatial variability of soil infiltration coefficient has greater effect on distribution uniformity than the irrigation application efficiency and storage efficiency. The method proposed in this paper can much better reflect the actual irrigation performance of border irrigation and provide a proper irrigation scheme with theoretical foundation and technological support. Number of references:20 Main heading:Irrigation Controlled terms:Efficiency - Infiltration - Seepage - Soil surveys - Soils Uncontrolled terms:Border irrigation - Clay loams - Distribution uniformity - Evaluation of irrigation performance - Infiltration parameters - Irrigation efficiency - Irrigation performance - Irrigation schemes - Objective evaluation - Sandy loams - Soil characteristics - Soil infiltration - Spatial variability - Storage efficiency - Technological supports - Theoretical foundations - Variation coefficient Classification code:407 Maritime and Port Structures; Rivers and Other Waterways - 441 Dams and Reservoirs; Hydro Development - 483.1 Soils and Soil Mechanics - 821.3 Agricultural Methods - 913.1 Production Engineering DOI:10.3969/j.issn.1002-6819.2012.01.019 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 10> Accession number:20120314688265 Title:Influence of flow velocity circulation at guide vane outlet of axial-flow pump on hydraulic loss in outlet conduit Authors:Liang, Jindong (1); Lu, Linguang (1); Xu, Lei (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:1 Issue date:January 1, 2012 Publication year:2012 Pages:55-60 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 influence of the velocity circulation at the guide vane outlet on the hydraulic performance of outlet conduit for a large pump system quantitatively, the methods to calculate velocity circulation and to measure the average angular velocity for the flow at the guide vane outlet of the pump system were put forward, the influence of circulation on the hydraulic losses of both siphon and straight outlet conduit were studied numerically and experimentally. The results indicated that the hydraulic loss of the outlet conduit was obviously influenced by the circulation at the guide vane outlet. There was an optimum circulation for the hydraulic loss of the outlet conduit to be minimized, the optimum circulation for siphon and straight outlet conduit was 0.972 and 1.308 m<sup>2</sup>/s respectively. The hydraulic losses calculated of the siphon and straight conduit under the condition of the optimal circulation were respectively lower 0.126 and 0.180 m than those under the condition of zero circulation. This study above could be helpful to optimal hydraulic design both for outlet conduit and guide vane of an axial-flow pump. Number of references:21 Main heading:Pumps Controlled terms:Boiler circulation - Numerical methods - Optimization - Siphons - Velocity Uncontrolled terms:Axial flow pump - Guide vane - Hydraulic designs - Hydraulic loss - Hydraulic performance - Outlet conduit - Pump system Classification code:614.2 Steam Power Plant Equipment and Operation - 618.2 Pumps - 619.1 Pipe, Piping and Pipelines - 921.5 Optimization Techniques - 921.6 Numerical Methods - 931.1 Mechanics DOI:10.3969/j.issn.1002-6819.2012.01.011 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 11> Accession number:20120314688266 Title:Eddy current loss of containment shell of high-speed magnetic driving pump Authors:Kong, Fanyu (1); Zhang, Yong (1); Shao, Fei (1); Wang, Zhiqiang (2); Xue, Ling (1) Author affiliation:(1) Technical and Research Center of Fluid Machinery Engineering, Jiangsu University, Zhenjiang 212013, China; (2) Shanghai Kaiquan Pump (Group) Co. Ltd., Shanghai 201804, China Corresponding author:Kong, F.(kongm@ujs.edu.cn) Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering Abbreviated source title:Nongye Gongcheng Xuebao Volume:28 Issue:1 Issue date:January 1, 2012 Publication year:2012 Pages:61-65 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 quickly and accurately study the effects of containment shell material on the eddy current loss of high-speed magnetic drive pump, containment shells using materials TC4 and 1Cr18Ni9Ti were simulated using ANSYS software. The numerical results of eddy current loss were compared with those of experiment. The comparison results showed that, the eddy current loss generated by 1Cr18Ni9Ti was 2.26 times more than that of TC4 when other parameters were the same. The numerical results were in agreement with that of experiment, thus the credibility of numerical simulation eddy current loss was proved. Besides, it was also proved that TC4 was an ideal material for containment shells of magnetic driving pump. Number of references:14 Main heading:Experiments Controlled terms:Computer simulation - Eddy currents - Finite element method - Pumps - Shells (structures) Uncontrolled terms:1Cr18Ni9Ti - ANSYS software - Comparison result - Containment shells - Eddy current-loss - Finite Element - High-speed - Magnetic drive pumps - Magnetic driving - Numerical results Classification code:408.2 Structural Members and Shapes - 618.2 Pumps - 701.1 Electricity: Basic Concepts and Phenomena - 723.5 Computer Applications - 901.3 Engineering Research - 921.6 Numerical Methods DOI:10.3969/j.issn.1002-6819.2012.01.012 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 12> Accession number:20120314688288 Title:Optimization of rural biomass waste recycling patterns for biogas-oriented utilization Authors:Ren, Feng (1); Liu, Yingzong (2); Niu, Dongxiao (1) Author affiliation:(1) School of Business and Administration, Tianjin University, Tianjin 300072, China; (2) School of Economics and Management, North China Electric Power University, Baoding 071003, China Corresponding author:Ren, F.(renfeng2002@126.com) Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering Abbreviated source title:Nongye Gongcheng Xuebao Volume:28 Issue:1 Issue date:January 1, 2012 Publication year:2012 Pages:190-195 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:Scientific recycling of rural biomass waste is the foundation of its biogas-oriented utilization. In the background of energy shortage in the world, the rural biogas company was proposed to establish to recycle the abundant biomass waste in rural areas efficiently and scientifically. Four recycling patterns were given in this paper. Each recycling pattern was studied from the perspectives of the recovery, recycling price and optimal profit, and the conclusion was drawn that the joint recycling pattern was the best pattern and the increasing fund support was the key factor for the healthy and sustainable development of rural biomass waste recycling industry. The study had an important reference value to establish a scientific rural energy system to meet rural energy needs and ease the pressure of energy shortage. Number of references:20 Main heading:Energy conversion Controlled terms:Biogas - Biomass - Energy conservation - Energy management - Optimization - Profitability - Recycling - Rural areas - Wastes Uncontrolled terms:Biomass wastes - Energy shortages - Key factors - Reference values - Rural energy Classification code:921.5 Optimization Techniques - 911.2 Industrial Economics - 821.5 Agricultural Wastes - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 525 Energy Management and Conversion - 522 Gas Fuels - 452.3 Industrial Wastes DOI:10.3969/j.issn.1002-6819.2012.01.034 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 13> Accession number:20120314688291 Title:Design on LED flexible light system and its effect on growth of spinach Authors:Liu, Xiaoying (1); Xu, Zhigang (1); Jiao, Xuelei (1); Chen, Weiping (1) Author affiliation:(1) College of Agronomy, Nanjing Agricultural University, Nanjing 210095, China Corresponding author:Jiao, X.(jiaoxl@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:1 Issue date:January 1, 2012 Publication year:2012 Pages:208-212 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 introduce effect of the light emitting diodes (LED) light system on growth and chlorophyll content of spinach, hardware and software of the flexible controlled LED light system were designed. The growth test of spinach under six different light quality LED and set fluorescence lamp as control was carried out. The result showed that light quality, light intensity, photoperiod and duty cycle the LED light system could be flexible controlled and were good light system for supplement light or researches of photobiology. The result of growth experiment in spinach under the light treatments showed that petiole length, leaf area, petiole and root length of the red, blue and yellow (RBY) LED treatment were significantly greater than those of other treatments, and more robust. Furthermore, photosynthetic pigment content of the RBY treatment was significantly higher than other treatments. Supplement yellow light on the basis of the red and blue composite light was benefit to synthesize photosynthetic pigments and significantly promote the growth of spinach. Number of references:20 Main heading:Light emitting diodes Controlled terms:Chlorophyll - Flexible structures - Growth (materials) - Light - Plants (botany) - Quality control Uncontrolled terms:Chlorophyll contents - Duty cycles - Hardware and software - Leaf area - LED light system - LED lights - Light intensity - Light quality - Light systems - Light treatments - Photobiology - Photosynthetic pigments - Root length - Spinach - Yellow light Classification code:408.2 Structural Members and Shapes - 461.9 Biology - 741.1 Light/Optics - 804.1 Organic Compounds - 913.3 Quality Assurance and Control - 951 Materials Science DOI:10.3969/j.issn.1002-6819.2012.01.037 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 14> Accession number:20120314688292 Title:Effect of cultivating years of vegetable field on soil heavy metal content and enzyme activity in plastic shed Authors:Chen, Bihua (1); Yang, Helian (1); Zhou, Junguo (1); Ren, Xiujuan (1); Ma, Jie (1); Sun, Li (1); Li, Xinzheng (1) Author affiliation:(1) College of Horticulture and Landscape Architecture, Henan Institute of Science and Technology, Xinxiang 453003, China Corresponding author:Li, X.(lxz2283@126.com) Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering Abbreviated source title:Nongye Gongcheng Xuebao Volume:28 Issue:1 Issue date:January 1, 2012 Publication year:2012 Pages:213-218 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 discuss effect of different cultivating years on soil heavy metal accumulation and enzyme activity in plastic shed vegetable field and the relationship between them, the 140 samples of soil were collected from plastic shed vegetable field of different cultivating years (0, 5, 10, 15, 20, 25, 30 a), and their heavy metal contents and enzyme activities were determined. The results showed that the contents of Zn, Pb and Cu were most significantly correlated with cultivating years respectively, the contents of Cd, Ni and Mn were significantly correlated with cultivating years respectively, the content of Cr was not correlated with cultivating years. The activities of soil peroxidase, polyphenol oxidase and amylase were most significantly correlated with cultivating years respectively, the activities of soil phosphatase and saccharase were significantly correlated with cultivating years respectively, the activities of soil catalase, urease and protease were not correlated with cultivating years respectively. With cultivating years increasing, the activities of soil polyphenol oxidase and peroxidase were inhibited the contents of Zn and Cu, the sensitivity order was sensitivity of peroxidase to Zn > sensitivity of polyphenol oxidase to Zn > sensitivity of peroxidase to Cu > sensitivity of polyphenol oxidase to Cu. The soil peroxidase and polyphenol oxidase could be regarded as the indicator enzyme of Zn pollution, the soil peroxidase could be regarded as the indicator enzyme of Cu pollution. The study provides a foundation for soil environmental quality evaluation in polluted protected field. Number of references:32 Main heading:Soil pollution Controlled terms:Bioaccumulation - Chromium - Copper - Enzyme activity - Greenhouses - Heavy metals - Lead - Manganese - Metals - Pollution - Soils - Vegetables - Zinc Uncontrolled terms:Cultivating years - Environmental quality - Heavy metal accumulation - Heavy metal contents - Pb and Cu - Polyphenol oxidase - Vegetable Field Classification code:821.6 Farm Buildings and Other Structures - 821.4 Agricultural Products - 546.3 Zinc and Alloys - 546.1 Lead and Alloys - 544.1 Copper - 543.2 Manganese and Alloys - 543.1 Chromium and Alloys - 531 Metallurgy and Metallography - 483.1 Soils and Soil Mechanics - 461.9 Biology - 454.2 Environmental Impact and Protection DOI:10.3969/j.issn.1002-6819.2012.01.038 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 15> Accession number:20120314688305 Title:Effects of yogurt starters autolysis on quality of yogurt Authors:Sun, Jie (1); Shen, Jin (2); Wang, Xizhuo (2); Tian, Yazhou (2); Lü, Jiaping (1); Liu, Lu (1) Author affiliation:(1) Institute of Agro-Food Science and Technology, Chinese Academy of Agricultural Sciences, Beijing 100083, China; (2) Chinese Academy of Agricultural Engineering, Beijing 100125, China Corresponding author:Lü, J.(lvjp586@vip.sina.com) Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering Abbreviated source title:Nongye Gongcheng Xuebao Volume:28 Issue:1 Issue date:January 1, 2012 Publication year:2012 Pages:287-292 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:For developing new composite yogurt starters and finding new lactic acid bacteria strains for starters, the effects of yogurt starters autolysis on quality of yogurt, such as acid producing ability and curd ability of strains, yogurt viscosity, water-holding ratio, flavor compounds, acidification in shelf-life were studied. The results showed that coagulation time decreased significantly by using high autolysis rate lactic acid bacteria strains fermented yogurt, were positively related to acid producing ability of lactic acid bacteria starters. There was no relative correlation between autolysis rate of strains and water-holding ratio, viscosity and flavor compounds of yogurt. However, yogurt acidities were significant influenced by autolysis rate of lactic acid bacteria starters, especially in the simulated shelf life of 10-15°C storage conditions. High autolysis rate starters could decrease acidification level of yogurt. Number of references:12 Main heading:Dairy products Controlled terms:Acidification - Antigen-antibody reactions - Bacteria - Coagulation - Fermentation - Flavor compounds - Lactic acid - Starters - Viscosity Uncontrolled terms:Acid producing - Autolysis - Coagulation time - Lactic acid bacteria - Shelf life - Storage condition - Yogurt Classification code:822.3 Food Products - 822.2 Food Processing Operations - 802.3 Chemical Operations - 802.2 Chemical Reactions - 631.1 Fluid Flow, General - 617 Turbines and Steam Turbines - 461 Bioengineering and Biology DOI:10.3969/j.issn.1002-6819.2012.01.051 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 16> Accession number:20120314688277 Title:Performance of funnel-shaped plastic bottle for water saving cultivation in extreme arid region Authors:Cao, Lintao (1); Gao, Bin (1); Wang, Qiandao (2); Cao, Yibin (2) Author affiliation:(1) School of Engineering and Architecture, Xiangfan University, Xiangyang 441053, China; (2) Xiangyang Municipal Engineering General Corporation, Xiangyang 441000, China Corresponding author:Cao, L.(30caolintao@tongji.edu.cn) Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering Abbreviated source title:Nongye Gongcheng Xuebao Volume:28 Issue:1 Issue date:January 1, 2012 Publication year:2012 Pages:123-126 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 resolve the plants survival difficulty in high permeability or water-shortage area, the water-saving cultivation by funnel-shaped plastic bottle was studied through laboratory and field tests. Different water losing conditions were simulated in the laboratory to continuously test water content of sandy soil in the plastic bottle every day. Then, the regressive function was built to describe the relationship between remaining water content in sandy soil and time. Testing Results showed that the higher the environment temperature was, the greater the rate of water loss. From the saturated water content to the wilting water content, an interval of watering could be 9 days at room temperature ((22±1)°C).The funnel-shaped bottles could delay water loss compared to straight cylinder-shaped bottles. Sand particles combined with organic fertilizers were more facilitated to conserve water than clay soil, and they could be used to adjust the rate of water loss. Field planting tests (with bottles and without bottles) confirmed its water-saving effectiveness. Due to high efficiency of water accumulation and saving, funnel-shaped bottles can benefit plants cultivation in high permeability or water-shortage area. Number of references:16 Main heading:Bottles Controlled terms:Arid regions - Clay - Fertilizers - Permeation - Plastic bottles - Sand - Soil moisture - Water conservation Uncontrolled terms:Clay soil - Environment temperature - Field test - Funnel-shaped - High permeability - Organic fertilizers - Room temperature - Sand particles - Sandy soils - Saturated water - Testing results - Water accumulation - Water losing - Water loss - Water-saving Classification code:443 Meteorology - 444 Water Resources - 483.1 Soils and Soil Mechanics - 694.2 Packaging Materials - 801.4 Physical Chemistry - 804 Chemical Products Generally DOI:10.3969/j.issn.1002-6819.2012.01.023 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 17> Accession number:20120314688268 Title:Wind tunnel test on vibration reduction of forest by spring damper in casing pipe Authors:Zhou, Jianzhong (1) Author affiliation:(1) Key Laboratory of Soil and Water Conservation and Desertification Combating, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China Corresponding author:Zhou, J.(zjzonline@sina.com) Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering Abbreviated source title:Nongye Gongcheng Xuebao Volume:28 Issue:1 Issue date:January 1, 2012 Publication year:2012 Pages:72-77 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 reduce wind-induced vibration damage of forest, four spring dampers in casing pipe were developed based on vibration reduction theory in this article, and wind-induced vibration reduction of four Populus alba var. pyramidalis specimens were carried out separately by them. In a self-made simple wind tunnel, contrast tests of vibration reduction with/without the action of damper were carried out by simulating natural wind environment; comparative characteristics curves of wind-induced dynamic strain, wind-induced dynamic displacement, wind-induced dynamic speed and wind-induced dynamic acceleration response were obtained. Results showed that wind-induced dynamic response of forest could be measured by strain gages pasting on forest and charge accelerometer installed on forest, and wind-induced dynamic peak response, such as strain, displacement, velocity and acceleration, could be reduced effectively by spring damper in casing pipe fixed on forest, and the effect of vibration reduction of forest equipped with spring damper in casing pipe was very good. Spring damper in casing pipe developed in this paper has features such as relative simple structure, low cost, and good weather resistance, and therefore it is suitable for popularization over large areas, especially suitable for wind disaster protection of forest in difficult stand conditions. Wind disaster protection of forest are carried out through the use of spring damper in casing pipe developed in this paper, and the methods in this paper give a new approach to wind disaster protection of forest. Number of references:15 Main heading:Forestry Controlled terms:Accelerometers - Dynamic response - Oil well casings - Pipe - Shock absorbers - Vibrations (mechanical) - Wind tunnels Uncontrolled terms:Casing pipe - Disaster protection - Dynamic acceleration - Dynamic displacements - Dynamic speed - Dynamic strain - Effect of vibration - Low costs - Natural wind - Peak response - Populus - Simple structures - Vibration reductions - Weather resistance - Wind induced vibrations - Wind tunnel tests Classification code:943.1 Mechanical Instruments - 931.1 Mechanics - 821.0 Woodlands and Forestry - 651.2 Wind Tunnels - 619.1 Pipe, Piping and Pipelines - 511.2 Oil Field Equipment - 408.1 Structural Design, General DOI:10.3969/j.issn.1002-6819.2012.01.014 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 18> Accession number:20120314688935 Title:Optimization of power matching on torque converter with diesel engine for wheel loader based on performance evaluation mesh figure Authors:Chang, Lü (1) Author affiliation:(1) Faculty of Transportation Engineering, Huaiyin Institute of Technology, Huai'an 223003, China Corresponding author:Chang, L.(changlv7114@163.com) Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering Abbreviated source title:Nongye Gongcheng Xuebao Volume:28 Issue:1 Issue date:January 1, 2012 Publication year:2012 Pages:50-54 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 performance evaluation indexes for matching torque converter with diesel engine are so many that it is difficult to determine their index weights. In order to solve this problem. The optimization method on matching torque converter with diesel engine for wheel loader based on performance evaluation mesh figure was put forward in this paper. The performance evaluation indexes matching torque converter with diesel engine for wheel loader included five items, such as the rated conditions approach degree, the activation energy degree, the economic zone tolerance, the power delivery constant, and the fuel consumption coefficients. The five matching performance indexes were defined and calculated, respectively. According to the size of the calculated value, the performance evaluation mesh figure about matching torque converter with diesel engine for wheel loader was constructed. This figure aimed at optimizing the minimum area of the performance evaluation mesh figure, constructing the objective function, optimizing hydraulic torque converter effective diameter. The original size of hydraulic torque converter effective diameter was 0.360 m, the effective diameter of the optimized hydraulic torque converter on wheel loaders was 0.350 m. After optimization, the matching performance of engine and torque converter was increased by 5.7%. Based on performance evaluation mesh figure, the optimization method improves the performance of matching torque converter with diesel engine. Number of references:15 Main heading:Diesel engines Controlled terms:Activation energy - Construction equipment - Electric power transmission - Engines - Hydraulic torque converters - Loaders - Mining machinery - Optimization - Torque - Torque converters - Wheels Uncontrolled terms:Calculated values - Consumption coefficient - Economic zones - Effective diameter - Index weight - Matching performance - Mesh figure - Objective functions - Optimization method - Performance evaluation - Power delivery - Power matching - Rated condition - Wheel loader - Wheel loaders Classification code:921.5 Optimization Techniques - 801.4 Physical Chemistry - 706.1.1 Electric Power Transmission - 612.2 Diesel Engines - 612 Engines - 602.1 Mechanical Drives - 602 Mechanical Drives and Transmissions - 601.2 Machine Components - 502.2 Mine and Quarry Equipment - 421 Strength of Building Materials; Mechanical Properties - 405.1 Construction Equipment DOI:10.3969/j.issn.1002-6819.2012.01.010 Database:Compendex Compilation and indexing terms, Copyright 2011 Elsevier Inc. <RECORD 19> Accession number:20120314688270 Title:Experiment on flow pattern in labyrinth emitter Authors:Li, Zhiqin (1); Ma, Jing (2) Author affiliation:(1) Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an 710048, China; (2) College of Water Resources and Engineering, Taiyuan University of Technology, Taiyuan 030024, China Corresponding author:Li, Z.(lzq_lzq@163.com) Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering Abbreviated source title:Nongye Gongcheng Xuebao Volume:28 Issue:1 Issue date:January 1, 2012 Publication year:2012 Pages:82-86 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 flow pattern and the critical Reynolds number of flow pattern conversion to each other in the runner of the labyrinth emitter, the tests of the water flow for the model with five different sizes of runner were conducted, the phenomena of water flow were observed and analyzed, the relationship between the head loss and average velocity in the labyrinth runner was analyzed, and the relationship between friction loss and average velocity along the straight runner that with the same section size as the labyrinth runner was analyzed. The results show that: The labyrinth path has great disturbance on the flow, making the laminar flow change into the transition region when Reynolds number is 41.5; the laminar flow may occur in the labyrinth units at the entrance section which accounts for 10%-12% of the whole labyrinth units. as a whole, the flow pattern can be regarded as turbulence or transition region; unlike the classical Reynolds test, the head loss in the labyrinth path is proportional to the 2.0-2.5th power