Non-isothermal Decomposition Kinetics of Complexes [ Sm(m-MBA)3 phen]2 and [ Sm(o-MOBA)3 phen] 2·2H2O

Introduction In recent years, there has been considerable interest in complexes formed by lanthanide cations and various benzoate derivatives[1-4], due to their potential application in areas, such as extraction, separation,germicide preparation, catalysis, luminescence, and functional material preparation[5].     

ON THE FALSE DEGENERACY OF THE HELMHOLTZ BOUNDARY INTEGRAL EQUATIONS

In this paper, the false degeneracy of the Helmholtz boundary integral equations is examined. A new theory to explain the false degeneracy of the Helmholtz boundary integral equations is given. In this proposed theory, a false degeneracy of the boundary integral equation is explained as finding a non-trivial source distribution such that it results in trivial field quantities inside the domain interested and non-trivial field quantities for its counter part, i.e., outside the domain interested. It is clearly explained that such a false degeneracy is independent of prescribed boundary conditions but dependent on the integral equation one selects. Moreover, the false degeneracy of the integral equation for the interested domain relates to the eigenproblem for its counter part. Under such a unified theory, the fictitious eigenvalue, spurious eigenvalue and pseudo-fictitious eigenvalue can be explained in a simple mathematical frame. It is concluded from our theoretical analysis that a multiply connected domain results in the pseudo-fictitious eigenvalue even the complex-valued formulations are used. In order to eliminate various kinds of false degeneracy, two methods are employed according to the previous research. A unified view of these two methods is provided such that they can be thought to be equivalent from mathematical point of view. Several numerical examples are given to show the validity of current approach.     

碳化硅多型体连生现象的X射线研究

本工作用劳埃法对分布于三十二炉的四百多个碳化硅单晶进行了类型分布、连生规律和结构完整性等的分析。大量的观察表明,碳化硅片状晶体中的共轴平行连生是一种普遍的现象,二种以上类型的连生占晶体总数的三分之二。文中列出了各种连生类型的统计。系统地报导了SiC晶体连生状况的X射线法实验结果。对各炉晶体所作的类型分布的分析表明,不同的制备条件下影响较大的是颜色和结构完整度。类型分布的规律性并不明显,邻近的晶体类型可以完全相异。用实验数据分析了类型、颜色和蚀坑间的关系。对碳化硅多型体产生的机理作了讨论。     

Determination of Thermal Conductivity of Liquids by a Multi-Point Laser Pump Method

As an advanced optical method, a multi-point pump method is presented for measurements of thermo-physical properties of liquids. Meanwhile, based on the laser-induced thermal grating method, a new theory model is presented and used to analyse the thermal effects caused by the multi-point laser pump, by which the thermal conductivity of liquids can be obtained. The results of some typical liquids, such as water, ethanol and acetone, are presented and are consistent with those of acknowledged values, demonstrating that the multi-point method is simple and useful for characterizing thermal properties of liquids.     

基于PCI9054的数据采集系统的实现

PCI总线结构具有高性能、低成本和软件兼容性好的特点,是PC机的主要总线系统。在介绍PCI9054接口芯片的基础上,给出了一种基于虚拟无线电的数据采集系统的设计。该系统使用模数转换器件和PCI总线传输高速数字信号,工作在通用计算机上,采用DMA结合中断实现高速数据传输。     

气体摆式倾角传感器流场影响因素分析

理论分析了密闭腔中自然对流气体稳态下的温度场和速度场对热敏丝的影响,给出了热敏丝电阻随温度和速度的变化关系。利用ANSYS软件计算了二维密闭腔体中点热源引起的速度场和温度场,并用流场计算结果定量分析了倾角变化时热敏丝电阻的变化。结果表明,热源所产生的温度场对热敏丝电阻的影响比速度场大近3个数量级,即对热敏丝电阻的变化起决定作用的是温度场而不是速度场。实验表明,电桥输出电压变化规律与数值计算结果基本一致。     

移动Ad Hoc网络中的QoS路由协议研究

移动Ad Hoc网络是一种无线多跳自治系统网络，如何提供QoS保障是它面临的重要问题，其中QoS路由是一个关键技术。文章首先介绍了AdHoc网络的特点，并且介绍了其QoS保障技术。接着对当前AdHoc网络主要的路由协议进行了详细的分析与研究，并从几个方面进行了比较和分析。最后指出了Ad Hoc网络QoS路由协议中需要解决的问题和今后的研究方向。     

广播新闻语音的关键词检测系统

提出了一种两阶段的关键词检测策略，关键词表可即时配置、即时使用。与以往不同的是，解码是在整个声学空间上进行的，而不仅仅是关键词所构成的声学空间。首先，利用维特比解码得到最优候选的音素序列。然后，通过关键词列表，可以产生候选的关键词。最后，采用了基于声学模型的置信度与基于网格的置信度相结合的方法来降低虚警。实验证明，新的框架下关键词检测的性能得到了显著的提高。     

基于ADSP-TS101雷达动目标检测的实现

根据某型雷达系统的设计要求，用ADSP-TS101实现高性能、高速的实时动目标检测，同时给出了基于ADSP-TS101动目标检测的算法框图、软件流程图，并讨论了实现中存在的问题。