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A Comparison of Recursive Least Squares Estimation and Kalman Filtering for Flow in Open Channels
Optimal control Least squares estimation Kalman flters Open-channel flow
2009/10/10
An integrated approach to the design of an automatic control system for canals using a Linear Quadratic Gaussian regulator based on recursive least squares estimation was developed. The one-dimensiona...
迷宫流道转角对灌水器抗堵塞性能的影响(Influence of Angle of Labyrinth Channels on Anti-clogging Performance of Emitter)
灌水器 迷宫流道 转角
2009/9/25
以转角分别为45.0°、60.0°、67.5°和75.0°的齿形流道灌水器为研究对象,应用CFD流场速度数值分析、PIV颗粒运动轨迹线和速度观测对比以及浑水抗堵塞测试相结合的方法,研究了转角对灌水器水力性能和抗堵塞能力的影响。结果表明转角与流量系数及流态指数均呈负相关关系,而灌水器的抗堵塞能力随着转角的增加呈下降趋势。综合分析转角对水力性能和抗堵塞性能的影响,提出迷宫流道结构灌水器的合理转角为60...
迷宫流道转角对灌水器水力性能的影响(Influence of Angle of Labyrinth Channels on Hydraulic Performance of Emitter)
滴灌 灌水器 迷宫流道 转角 水力性能
2009/5/22
为研究齿形、梯形以及矩形流道转角变化对水力性能的影响,采用Fluent软件对不同形状下不同转角的流道进行了数值模拟。研究结果表明:当其他条件相同时,转角的变化与流量系数、流态指数呈负相关,其变化对梯形流道灌水器的流量系数影响最大,最多下降了19.03% ,齿形流道次之,下降了10.14%,矩形流道是梯形流道转角角度增加的延伸,具有相同的水力性能变化规律;随着角度的增加,梯形流道总的局部水头损失系数...
Agriculture finance and credit infrastructure – conditions, policies and channels
European agriculture agricultural finance agricultural credit sustainable rural banking EU enlargement
2014/3/29
Agriculture, like all sectors of the economy, needs credit for its development. Experience in OECD countries demonstrates that in a competitive financial environment, profitable agriculture can obtain...