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在生产过程中,有些控制系统中的参数不是常数而是一个区间时,与常规的方法有较大的不同.本文以一阶系统为例,在MATLAB环境下用INTLAB软件编程建立运行区间系统,获得采用PI调节器进行校正后其系统的输出响应,并用仿真结果的变化来确定区间系统的最优控制参数. 相似文献
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Pazilaiti Yakufu Hui Qi Meina Li Xiaomei Ling Wenjing Chen Ying Wang 《Electrophoresis》2013,34(4):531-540
We have developed an on‐line screening method for CC chemokine receptor 4 (CCR4) ligands, in which the whole cells expressed with CCR4 were cultured adherently and immobilized on the inner wall of the capillary as the stationary phase for the first time. Moreover, in this method it is unnecessary to isolate and purify the target receptors from cell membranes. Therefore, it is possible to almost completely preserve the native conformation of the target receptors. The binding activities of the immobilized CCR4 did not change. A known antagonist of CCR4, compound A, was employed to validate the bioactivity of the cell layer and stability of this method. The intraday, interday, and batch‐to‐batch reproducibilities were investigated (RSD ≤ 13.9%). Nonlinear chromatography was used to calculate the binding constant between the compound A and CCR4 (6.4 × 104/M, RSD = 4.96%). Using this method, the qualitative and quantitative characterizations of 23 computer‐aided drug design compounds were achieved and the kinetic parameters (K, ka, kd, and k′) were obtained by nonlinear chromatography. Three active compounds were screened out, which also showed activity in chemotaxis inhibition assay. The experimental results show that this method is simple, sensitive, and efficient for drug screening. Moreover, it offered a novel way to detect the nonspecific interactions between ligands and cell membrane. 相似文献
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