微波炉在流动注射体系中的在线应用

微波炉在流动注射体系中的在线应用是近１０年来发展的一项新技术，在样品的在线分解和加速流动注射分析中指示反应速度方面获得广泛应用。本文从仪器技术、结果和应用几个方面概述了从１９８６年以来这项技术的发展。     

A Pre－lasing Reliable Dynamic Filter Single－longitudinal－mode Q－switched Laser

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The Shape of the Moving Grain Boundary in the Reversed-Capillary Technique Under Consideration of the Drag Effect

The shape of the curved part of the migrating grain boundary driven by capillary forces was studied for the reversed-capillary bicrystal technique. A comparison of experimentally observed and theoretically calculated shapes showed good agreement when the drag effect by mobile obstacles was taken into account. So far previous studies dealing with the reversed-capillary technique have not considered the drag effect. Consequently, they assume a scaling behavior of the shape of the moving grain boundary. In this study it is shown that this assumption generally is not possible for the reversed-capillary technique. Furthermore, it is shown that the geometry factor used for determination of the driving force is dependent on the displacement. Problems specific to the reversed-capillary technique due to the drag effect are discussed. The analysis of the boundary shape is presented as a tool to distinguish free and dragged motion.     

Self-marking phase-stepping electronic speckle pattern interfometry (ESPI) for 3D displacement measurement on cathode ray tube (CRT)-panels

This study demonstrates the feasibility of applying phase-shifting electronic speckle pattern interfometry to measure the deformation field of the front panel of a cathode ray tube, to support analysis to enhance the implosion-resistance capacity under violent collapse. Two effects, the air exhaustion and shrink band constraint effects, are comprehensively investigated. The angle of an adjustable mirror is switched, to provide three sensitivity vectors that are required in 3D-displacement measurement. A Fourier filtration is employed to remove speckle noise and establish a noise-free phase map. Inconsistent points are identified and masked to prevent any possible divergence during phase unwrapping. The results show that the accuracy of this method is satisfactory.     

Structure of Carbon-coated or Silicon-oxide-coated ZnTe,ZnSe and ZnS Nanoparticles Produced by Gas Evaporation Technique

Ultrafine particles of typical chalcogenides have been produced by the advanced gas evaporation method (AGEM) and characterized by transmission electron microscopy. Zinc-blende nanoparticles less than 20-nm in size covered with SiO or carbon layer have been predominately produced. Many growth faults were observed in the zinc-blende particles above 20-nm in size. It has been found that particles less than 10-nm in size have no growth faults.     

一类非线性积－微分方程极值解的存在性定理

本文讨论非线性积－微分方程初值问题的极值解的存在性．其中“利用单调迭代法和上、下解方法，得到了最小解和最大解的存在性定理．     

二维直通道内气固两相流动的实验研究

本文利用频闪激光片光源摄像和图象处理技术，对二维直通道内气固两相流动进行了实验研究，定量测定了固体粒子的运动参数、运动速度、方向．测得了粒子的运动轨迹．并得出一些有价值的结论：在本实验范围内粒子基本上沿直线运动，并处于不断加速的状态；粒子与壁面碰撞的时间极短，反弹角小于碰撞角，反弹速率小于碰撞速率．从而获得了在不同的进口气流速度及不同的通道倾角下固体粒子与固体壁面碰撞的某些规律．得到了粒子与壁面相互作用的关系表达式．为理论计算打下了基础．     

Separation of sets and Wolfe duality

Lagrangian duality can be derived from separation in the Image Space, namely the space where the images of the objective and constraining functions of the given extremum problem run. By exploiting such a result, we analyse the relationships between Wolfe and Mond-Weir duality and prove their equivalence in the Image Space under suitable generalized convexity assumptions.      

椭圆薄膜的椭圆性

证明了夹住椭圆薄膜的整个边界不是使薄膜的椭圆性成立的必要条件。特别地，给出了两类边界条件，分别叫做部分自由边界条件和共轭边界条件，它们使得椭圆薄膜具有椭圆性但其边界没有被完全夹住。这些结果纠正了Slicaru在下面的章中所犯的错误：On the ellipticity of the middle surface of a shell,C.R.Acad.Sci.Paris,t.322,Serie,p.97-100,1996。最后，通过例子说明，当椭圆薄膜的边界不限制任何条件时，使应变能有限的位移向量空间可非常大。     

An automatic image analysis system for the evaluation of dielectric track detectors

The automatic image analysis system for scanning solid state nuclear track detectors is designed by utilizing a microdensitometer. The control of the entire system as well as the data analysis are accomplished with the IBM PC computer equipped with a FrameGrabber. The system counts the number of tracks and measures their geometrical parameters. The usage of the system is illustrated by counting rhombic tracks in mica detectors which were used for the investigation of the fusion–fission reaction ¹²C+ ²⁰⁸Pb.