四硫代钼酸铵与四硫代钨酸铵合成方法改进的研究

对钼酸铵与硫化氢反应合成四硫代钼酸铵、钨酸与硫化氢反应合成四硫代钨酸铵的方法进行了改进。结果表明，采用改进后的方法，反应时间分别为７小时和１１小时。比文献值￣［１１］缩短了许多。产率分别为９１．１％和５２．１％，均高于文献值￣［１］。     

泡沫的持液量研究

泡沫的持液量（ｈ，ｍｇ／ｃｍ３）是泡沫的基本特性之一．本文对形成泡沫的起泡剂浓度、增粘剂浓度、气体流量和温度等因素对Ｈ的影响及变化规律作了研究，并对Ｈ与泡沫表观粘度和泡沫半衰期的相互关系作了描述，对泡沫的实际应用具有一定的指导意义．     

半导体激光器行波速率方程的研究

考虑了ＩｎＧａＡｓＰ半导体激光器的俄歇效应后，对描述稳态运行的半导体激光器的行波速率方程组进行了修正，求得了隐函形式的解析解，并以此对激光器的一些重要持性进行了讨论。     

第一临界情形下的三次系统局部结构的判断准则

讨论了第一临界情形下的平面三次系统高次奇点的局部拓朴结构，并给出利用多项式系数的判断准则。     

Business Process Reengineering (BPR) Versus Outsourcing—Critical Perspectives

This article presents a case example involving the renaming of an organizational change process from BPR to outsourcing. The paper discusses the important ramifications of such a name change in that the recognition of outsourcing allowed an organizational commitment to counseling and termination advice. The paper discusses two ways of looking at the name change, one from a critical theory perspective and one from a realist perspective. It demonstrates how theory can provide useful yet markedly different interpretations of such organizational events. Critical theory operates from within what can be termed the transitive epistemological dimension, whereas critical realism tends to emphasize the importance of ontological issues. Each has important things to say about the situation and improves our understanding overall.     

Subset threshold autoregression

We develop in this paper an efficient way to select the best subset threshold autoregressive model. The proposed method uses a stochastic search idea. Differing from most conventional approaches, our method does not require us to fix the delay or the threshold parameters in advance. By adopting the Markov chain Monte Carlo techniques, we can identify the best subset model from a very large of number of possible models, and at the same time estimate the unknown parameters. A simulation experiment shows that the method is very effective. In its application to the US unemployment rate, the stochastic search method successfully selects lag one as the time delay and five best models from more than 4000 choices. Copyright © 2003 John Wiley & Sons, Ltd.     

缓凝砂浆螺旋输送理论研究

缓凝预应力筋包覆装置是将新型独特的缓凝材料应用于预应力混凝土体系的一种施工设备．通过对缓凝砂浆的流变性能分析，建立了螺旋输送物理模型，运用粘性流体力学的运动微分方程研究缓凝砂浆螺旋输送的速度场和流率，从而对其装置的设计和运行参数的合理选择提供了理论依据．     

成像公式法测量望远镜放大倍数

介绍用成像公式法测量望远镜放大倍数的方法,并对这种测量方法进行改进提高测量的精确度.     

临近空间单粒子效应的数值模型和电路模拟

针对临近空间单粒子效应进行了数值模型仿真和特征尺寸为0.1 μm的反相器电路的脉冲注入模拟研究。数值仿真结果表明器件临界电荷随着工作电压的降低而减小,敏感横截面随着临界电荷的降低而逐渐增大。临近空间微电子器件的单粒子翻转概率随敏感横截面增大而上升,但其又随临近空间高度的增加而下降。此外,利用SPICE软件脉冲注入模拟观察到了反相器电路的单粒子翻转现象。所得结论有助于深入研究临近空间的单粒子效应并为器件抗辐射加固提供了理论依据。