克服加热炉温度惯性的控制方法

克服加热炉炉温的惯性是炉温控制系统的难点,本文介绍了在加热炉温度控制系统中采用分时周期采样与Ｐ．Ｉ．Ｄ输出限幅的方法克服加热炉炉温热惯性。     

用DCF方法分析S5 0716＋714的光变特性

利用DCF方法对S5 0716＋714从1994年到2003年的15 073个光学波段数据和1990年到2004年的射电波段22GHz、37GHz的310个数据,分析了S5 0716＋714射电波段间、光学波段间、射电与光学波段间的光学相关性与时延.得出了S5 0716＋714射电波段间、光学波段间、射电与光学波段间存在较强的相关性和高频段的变化超前于低频段的变化的结论,支持了Blazar的标准模型.     

一类非线性多时滞系统的鲁棒镇定

研究在状态及控制变量中均含时滞的一类Ｌｕｒｅ型非线性不确定系统的鲁棒镇定问题，即设计线性控制律，以抑制系统的不确定性、时滞性和Ｌｕｒｅ非线性等因素的影响，从而保证原系统鲁棒稳定。基于Ｌｙａｐｕｎｏｖ稳定性理论，利用奇异值分解的方法，通过求解最优调节器的代数Ｒｉｃｃａｔｉ方程，给出了期望控制律的存在条件和解析表达式，使不确定系统在不同时滞作用下及Ｌｕｒｅ非线性因素影响下仍能达到渐近稳定，为这类问题的解决提供一种途径。     

A study of macromolecular diffusion through native porcine mucus

A diffusion chamber technique based on time-lag analysis for the estimation of effective diffusion coefficients of radiolabelled macromolecules of varying molecular weights through native mucus gel is reported. For all solutes studied, a reduction in effective diffusion coefficients was observed with a retardation of solute flux in both aqueus and mucus layers. Over the molecular weight range of solutes investigated (126–186 000 Daltons), a consistent effect of molecular weight was evident with regard to the retarding effect of mucus. No apparent or absolute molecular weight cut-off for macromolecular transfer was exhibited. However, at high molecular weights (>30 000 Daltons) the retardation was greatly enhanced. The results confirm that mucus can be regarded as a gel with finite pores, but that it does not constitute an absolute barrier to even high molecular weight solutes.