茄子剪枝再生栽培技术

从品种选择、植株选择、剪枝前后的各项管理,以及各种主要病虫害的表现与防治等方面,介绍了茄子剪枝再生栽培技术,并经过近几年的示范推广,增产增值效果显著,在一定程度上提高了经济效益。     

Effect of Adsorbent Diameter on the Performance of Adsorption Refrigeration

Adsorbents are important components in adsorption refrigeration. The diameter of an adsorbent can af-fect the heat and mass transfer of an adsorber. The effect of particle diameter on effective thermal conductivity was investigated. The heat transfer coefficient of the refrigerant and the void rate of the adsorbent layer can also affect the effective thermal conductivity of adsorbents. The performance of mass transfer in the adsorber is better when pressure drop decreases. Pressure drop decreases with increasing permeability. The permeability of the adsorbent layer can be improved with increasing adsorbent diameter. The effect of adsorbent diameter on refrigeration output power was experimentally studied. Output power initially increases and then decreases with increasing diameter under different cycle time conditions. Output power increases with decreasing cycle time under similar diameters.     

类反斜线回滞系统的模型参考滑模控制

回滞现象广泛地存在于许多控制研究领域,可能引起系统的振荡,甚至造成系统的不稳定,因此有必要对回滞系统的有效控制进行研究.针对一类重要的类反斜线回滞系统,通过对类反斜线回滞特性的分析,将其分解为线性部分和已知上限的非线性不确定部分,给定期望的不存在回滞特性的光滑轨线,得到了模型参考滑模控制律,通过跟踪给定期望的不存在回滞特性的光滑轨线,削弱甚至消除回滞特性.仿真结果表明此控制律是有效的.