搜索结果: 1-5 共查到“农田水利 Systems”相关记录5条 . 查询时间(0.234 秒)
长距离输水系统停泵水锤的数值模拟（Numerical Simulation of the Water Hammer Caused by Accidental Pump-stop in Long Water Supply Systems）
泵站 供水工程 水力计算 水锤压力
2010/12/29
运用瞬态水力学理论和特征线方法，结合某实际工程，对联合采用空气阀、泄压阀和二阶段缓闭蝶阀进行水锤防护的长距离有压输水管道系统的事故停泵水力过渡过程进行了计算和分析，得到管线沿程的水锤压力包络线和空化体积曲线，以及典型断面的压力时程线。计算结果表明，采用两阶段缓闭蝶阀、泄压阀和空气阀进行水锤安全防护是十分必要的，有利于抑制正水锤压力的继续升高和阻止负水锤压力的持续降低，防止断流弥合水锤的发生。但从计...
Aboveground arthropod pest and predator diversity in irrigated rice（Oryza sativa L）production systems of the Philippines
Biological control Immigration Shannon index Species richness Evenness Dominance
2009/2/19
Abundance and diversity of pest and predator species at different stages of crop growth were studied in chemical insecticidetreated and untreated irrigated rice production systems of the Philippines i...
Determination of Hydraulic Performance of Trickle Irrigation Emitters used in Irrigation Systems in the Harran Plain
Drip irrigation in-line emitters manufacturers' coefficient of variance emitter exponent
2009/1/13
Trickle irrigation systems' efficiency depends on system uniformity, which is determined by water discharge uniformity from emitters. It is impossible to produce 2 identical emitters due to manufactu...
Determination of Hydraulic Performance of Trickle Irrigation Emitters used in Irrigation Systems in the Harran Plain
Drip irrigation in-line emitters manufacturers' coefficient of variance emitter exponent
2009/1/13
Trickle irrigation systems' efficiency depends on system uniformity, which is determined by water discharge uniformity from emitters. It is impossible to produce 2 identical emitters due to manufactur...
Performance Analysis of Collective Set-Move Lateral Sprinkler Irrigation Systems used in Central Anatolia
Sprinkler system Christensen uniformity coefficient Distribution uniformity Irrigation adequacy Central Turkey
2009/1/8
Performance assessment (PA) of irrigation and drainage systems has been an important area of research and debate in recent years. The present study was carried out to determine some performance parame...