Photolyse von Monochloressigsäure bei 253,7 nm in wäßriger Lösung

The photolysis of 0.5 mole/l monochloroacetic acid in aqueous solution at 253.7 nm was studied and as products were determined: Cl^? (?=0.34), CH₂OHCOOH (?=0.19), CO₂ (?=0.12), CH₃COOH (?=0.08), HCHO (?=0.004) and CH₄ (?=0.001). Based on these results a probable reaction mechanism is discussed to explain the rather complicated process.     

A Tracking Controller for a Certain Class of Nonlinear Systems

Controller design methods based on flatness and passivity are well established. These methods are applied to PCHD systems such that flatness is used to achieve a high tracking performance and passivity ensures disturbance rejection and robustness. Since the error system, written in displacement coordinates, is not a PCHD system in general, we present conditions, which ensures this property. Therefore, one can apply methods from passivity control to stabilize the error dynamics. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)     

变形体非协调理论的理性理论

本文介绍Noll和Wang等人用理性力学观点建立的变形体非协调理论(即缺陷的连续统理论)。这理论表明,本构方程完全确定物质流形的几何结构。因而,几何结构是理论的自然结果,而不是作为理论出发点的最初假设。      

移动边界问题的时空域正则区域迭代配点法

考虑热传导方程的移动边界问题,其定解区域随着时间而变化.构造一种时空域上的高精度数值算法求解1+1维移动边界问题.在时空域上假设一个初始移动边界位置,构成移动边界问题的不规则计算区域,选择一个适当的正则区域(矩形区域)完全覆盖所计算的不规则区域,在正则区域上利用移动边界约束条件和固定边界条件,采用时空域重心插值配点法求...     

A SQP METHOD FOR GENERAL NONLINEAR COMPLEMENTARITY PROBLEMS

§ 1　 IntroductionThe nonlinear complementarity problem(NCP) is to find a pointx∈Rn such thatx Tf(x) =0 ,x≥ 0 ,f(x)≥ 0 ,(1 .1 )where f is a continuously differentiable function from Rninto itself.It is well known thatthe NCP is equivalent to a system of smoothly nonlinear equations with nonnegative con-straintsH (z)∶ =y -f(x)x . y =0 ,s.t. x≥ 0 ,y≥ 0 ,(1 .2 )where z=(x,y) and x y=(x1 y1 ,...,xnyn) T.Based on the above reformulation,many in-terior-point methods are established;see,fo…     

EFFECTS OF EXCHANGE RATE AND TARIFFS ON AN OPEN ECONOMY OF SCARCITY OF CAPITAL

§ 1　 The ModelWe consider an economy,which is specialized in the production of a single tradablecommodity.The economy is also characterized by an exogenous growing population N =N0 ent(N0 >0 ,n>0 ) .The labor force is a constantfraction of the population and the techni-cal progress is subsumed into population growing.This paper assumes thatthe labor forceis equal to population,i.e.the fraction is1 .The representative firm(or household) in thiseconomy produces domestic outputy(t) by means o…     

THE ATTRACTORS OF PARTIAL DIFFERENTIAL EQUATIONS

§ 1　 IntroductionThe study of nonlinear dynamics is a fascinating problem which is at the very heartofthe understanding ofmany importantproblems ofthe natural sciences.Infinite dimensionaldynamical systems are very important in nonlinear dynamics.For an infinite dimensionaldynamical system,we mainly study the existence and the structure ofthe attractors.Thereare detailed discussions in [1 ] .Itis especially mentioned there thatthe attractors of gradi-ent systems are of simple structure in s…     

超氧化物歧化酶在以促进剂修饰的金电极上的电化学行为

应用循环伏安法探索了超氧化物歧化酶在Ｌ－半胱氨酸、组氨酸和精氨酸等氨基酸修饰的金丝电极上的电化学行为。实验结果表明,Ｌ－半胱氨酸是超氧化物歧化酶的有效促进剂。组氨酸和精氨酸则对超氧化物歧化酶氧化过程池不同程度的促进作用。此外,还讨论了４,４－二硫基联吡啶对超氧化物歧化酶电子传递过程的促进作用。     

矩形薄板的刚柔耦合动力学系统的建模理论研究

以由中心刚体与柔性板构成的刚柔耦合系统为对象,研究了零次近似模型和耦合模型在动力学方程以及实际计算中表现出来的差异.首先,从连续介质理论出发,在变形位移中,计及了在结构动力学中被忽略的变形位移的附加耦合项,建立了由中心刚体与柔性板构成的刚柔耦合系统的一次近似动力学模型.用一致质量有限元法对柔性板进行离散,基于Jourdain速度变分原理推导出大范围运动为自由的柔性板刚柔耦合动力学连续变分方程.通过数值仿真研究中心刚体和柔性板的大范围运动和变形运动的规律,揭示刚柔耦合动力学性质.通过数值对比,指出了零次近似模型的局限性.     

MULTI-LEVEL FILTER FOR INFRARED IMAGE PROCESSING

This paper presents a new multi-level filter algorithm and its corresponding VLSI architecture for infrared image processing. The algorithm eliminates the phenomena of splitting targets by inserting Gaussian pyramid processing. Owning three filter paths, the proposed filter VLSI architecture can enhance small targets with different size in infrared images. This architecture has been implemented using SMIC 0.35μm 4-layer CMOS technology. The test result shows that the filter chip not only effectively suppresses background, eliminates noise and enhances small targets in an infrared image, but also meets infrared image real-time processing requirement(5M ∼ 10M pixels/s). The implemented filter chip consists of 60,284 gates and 8K SRAM, operates at 50MHz.