搜索结果: 151-161 共查到“农田测量”相关记录161条 . 查询时间(2.388 秒)
基于GIS和模糊数学方法的多方案下农用土地多宜性评价
土地利用 农用土地多宜性评价 模糊综合评价 地理信息系统
2007/8/10
在可持续发展理论的指导下，以湖北省潜江市后湖农场流塘分场为研究对象，运用地理信息系统(GIS)和模糊综合评价方法，建立了最大生产潜力和最高经济效益两种方案下的土地评价系统。系统中针对不同方案、不同作物分别确立不同的评价指标体系及评价指标分级标准，采用标准化函数的方法对分级标准及评价指标值进行标准化，应用模糊综合评判法和GIS技术确定各评价单元的适宜性等级并绘制土地多宜性评价专题图。结果表明：流塘分...
小麦水分状况的光反射测量
2007/8/10
反射测量可用于对作物的水分状况进行快速而经济的评估。该研究以土壤最大持水量为标准，设65%、52%、39%、32.5%、26%和19.5%共6个水处理水平。小麦叶片光反射的测量用数码相机进行，测量结果用L*a*b*颜色系统进行评估和分析。在该三维系统中，参数a*和b*分别描述绿/红和蓝/黄颜色的比例，参数L*用来描述颜色的浅淡。结果表明，随水胁迫加剧，小麦叶片光反射参数a*(绿/红)和/或b*(...
The model of oscillating system with coil and its validation
dynamic systems mathematical model simulation validation
2014/2/27
This article demonstrates the solution of a dynamic system with a complex kinematical structure and rolling resistance in the Matlab-Simulink program. To validate the simulation, a physical model with...
2005年11月23日上午，科技部在国家气象卫星中心组织课题验收会，对863计划项目《农作物种植面积遥感监测技术规范与应用》进行验收，该项目由北京师范大学潘耀忠教授、国家统计局鲜祖德司长、张淑英副司长共同主持。来自科技部863信息获取与处理技术主题办公室、863专家组的6位专家和领导，承担该项目的课题负责人及相关研究人员等出席会议。
Possible use of vacuum controlled pulsators for sheep milking machines
milking machine sheep milking pulsator pulsation rate pulsator ratio
2014/2/28
Comparison measurements and evaluation of the suitability of three pulsators for sheep milking machines were carried out, i.e. a prototype made by the manufacturer of the milking parlour of the pulsat...
Influence of moisture content on pressure ratio of rape seeds
pressure ratio granular material rape seed model silo
2014/2/28
The pressure ratio of rape seeds was determined for four levels of moisture content in a model silo. The silo was 0.6 m in diameter and 0.6 m high. Ratio of horizontal to vertical pressure and distrib...
The effect of working conditions on the selected parameters of duckfoot shares
forces resistivity of loosening speed of operation depth soil moisture
2014/2/28
We measured a series of six duckfoot shares in the years 1999–2000. The purpose of the research project resulted from the Grant EP7111 and the Research project MSM J06/98:122200002/I. We described for...
Static and dynamic tests of pear bruise sensitivity
pears bruising compression impact bruise volume absorbed energy hysteresis losses degree of elasticity quality indentor spherical indentor with a flat head
2014/2/28
The paper is a continuation of the preceding research of bruising sensitivity applied to different pear varieties. This study was based on quasi-static fruit testing in compression between two plates....
Research of biological agents effects on reduction of ammonia concentration in stables of intensive farm animals breeding
ammonia emissions living environment slurry pigs poultry
2014/2/28
In the study are presented results of experiments using bio-technological agents Amalgerol, Bio-Algeen G-40 and Biostrong 510 in intensive pig, poultry breeding and cattle slurry treatment for ammonia...
Exergy of heat flows of the air-to-air plate heat exchanger
heat exchanger air efficiency energy exergy anergy heat flow stables
2014/2/28
Based on extensive measurements of the temperature, humidity and flow rate of the heated and cooled air in the plate heat exchanger this article analyses the influence of air inlet temperatures on bot...