自蔓延溶胶凝胶法制备纳米氧化镁

以硝酸镁为原料，柠檬酸为络合剂，采用自蔓延溶胶凝胶法制备纳米氧化镁.利用红外光谱分析了干凝胶的结构.将该法制得的柠檬酸镁与溶胶凝胶法制得的前驱体的TG曲线进行比较研究，证明了自蔓延燃烧的发生，而硝酸根在自蔓延燃烧中作为氧化剂.对样品进行TEM测试，发现有自蔓延燃烧过程的产物颗粒小、分布均匀和晶粒形状明显.XRD测试结果显示其平均粒径为8.9 nm， BET测定比表面为26.34 m²/g.该文还讨论了发泡过程抑制粉体团聚的机理.     

Diagnostic analysis of mesoscale rainstorms in the Jiang-Huai valley of China with convective vorticity vector

By the vector product of absolute vorticity vectors and equivalent potential temperature gradients, a new vector, convective vorticity vector (CVV) is readdressed after Gao et al., and is applied to the study of the development and movement of mesoscale rainstorms in the Jiang-Huai valley of China by using high-resolution simulation data with PSU/NCAR MM5 briefly. The results show that the CVV, especially its vertical component which is closely related to interactions between vertical secondary circulations and horizontal equivalent potential temperature gradients, may be a good tracer and diagnostic tool in the study of mesoscale rainstorms in the Jiang-Huai valley of China. And the main physical processes responsible for the variations of the vertical component of the CVV are discussed briefly based on its tendency equation proposed in this article.     

中职篮球教学训练中踝关节的损伤及预防措施

本文针对容易造成中职学生在篮球运动中踝关节损伤现象的原因进行分析总结，并介绍了损伤后的医疗处理方法，还就其预防措施进行了详细说明，从而为有效地保证学生安全的前提下进行更好的教学训练提供科学依据和指导。     

基于COM+的n_层体系结构的实现

COM +组件是新一代的组件技术 ,是把COM和MTS溶入一个无缝的服务包 ,并与Windows 2 0 0 0操作系统集成在一起 ,COM +不仅为COM和MTS增加了新的功能和服务 ,而且还加强了其现有的服务 ,该文先介绍COM +的原理和特征 ,并结合实例说明了如何用COM +技术构造一个典型的n层体系结构     

面向组件的软件需求协同分析研究

对当前主要的几种软件需求分析方法进行了分析，指出了它们的优、缺点及软件需求方法的发展趋势，提出了面向级件的软件需求分析方法，给出了面向组件的需求分析模型，同时提出了软件需求协同分析的方法，在需求分析的最后阶段－审核需求规格说明时，进行协同评审。     

城市供水系统的优化调度模型研究

阐述了优化调度模型的3个基本组成部分：优化调度模型，用水量预测模型和管网宏观模型。分析调度系统的建模方法，为选择优化调度方法提供依据。     

约束最优控制的变结构实现

通过一个应用实例，分析了控制受约束的最优控制最优解的理想特性和以其作为控制策略的局限性；然后运用变结构控制方法，对控制受约束的线性系统最优控制策略进行改造，使之在保持最优控制主体性能的同时，维持足够的稳定性和良好的鲁棒性。具体作法是在滑模趋近段采取沿边界控制（最优控制策略），而在滑模运动段采取边界内稳定控制（极点配置策略）。并对受约束控制的具体选取方法及滑动模态的可达条件均作了陈述或推导。最后给出了仿真结果。     

带脉冲的时滞双曲型系统正解的不存在性定理及其应用

建立了具有脉冲的时滞双曲型系统正解的不存在性定理，并且讨论了它们在脉冲时滞双曲型系统振动理论中的应用。     

程序光盘目录结构剖析

为了解决用户直接读取程序光盘文件的问题及掌握程序光盘目录结构 ,本文对程序光盘目录结构进行了详尽的剖析 .并给出确定程序光盘、读取程序光盘相关目录结构、目录文件结构的方法     

Microstructures of metallic film and diamond growth from Fe-Ni-C system

The microstructures of metallic film surrounding diamond have been systemically studied using the transmission electron microscopy (TEM) and the atom force microscopy (AFM). The film can be divided into three layers (inner layer near diamond, external layer near graphite and middle layer). The graphite cannot be directly transformed into diamond in the film at HTHP; there exists a parallel relationship between (−111) of γ-(Fe,Ni) and (110) of Fe₃C in the inner layer; the sawtooth-like step morphology found by AFM on the film is similar to that of corresponding diamond surface. A new model for diamond growth at HPHT is proposed from the parallel relationship and sawtooth-like step morphology. It is believed that Fe₃C may be a transitional phase in the course of diamond growth, γ-(Fe,Ni) in the inner layer can absorb carbon atom groups with lamella structure from Fe₃C, and then the carbon groups stack on growing diamond.