通用串行总线(USB)接口芯片USBN9602的应用

简要介绍了通用串行总线USB的特点,对USB接口芯片USBN9602的内部结构、引脚、寄存器组作了详细的论述,并介绍了其应用。     

Computational analysis of thin coating layer failure using a cohesive model and gradient plasticity

Thermal barrier coatings (TBC) are widely used to prevent transient high temperature attack and allow components high durability. Due to strong inhomogeneous material properties the TBC failure often initiates near the interface between the brittle oxide layer and the ductile substrate. A reliable prediction of the TBC failure requires detailed information about the crack tip field and the consequent fracture criteria. In the present paper both cohesive model and gradient plasticity are used to simulate the failure process and to study interdependence of the interface stress distribution with the specific fracture energies. Computations confirm that combination of the two models is able to simulate different failure mechanisms in the TBC system. The computational model has the potential to give a realistic prediction of the crack propagation process.     

基于移动代理的网络拓扑发现研究

提出了一种基于移动代理的分布式网络管理系统模型,阐述了该系统发现网络拓扑的过程,介绍了具体算法思想,给出了数据结构和算法描述,最后进行了仿真,证明了算法的有效性.     

φ90mm低铬铸球开裂失效分析

φ90mm低铬铸球在做落球试验中过早出现开裂现象。将该铸球材质进行化学成分分析、力学性能测定及金相组织观察。分析结果表明，该铸球的材料中夹杂物含量较高，其硬度值又偏高，铸球内部又存在严重缩松及其铸态组织中存在大量奥氏体转变产物，致使铸球在落球试验中过早开裂。经过工艺措施的改进，解决了铸球出现过早开裂的现象。     

A New Measure of Misfit for Covariance Structure Models

Various fit indices exist in structural equation models. Most of these indices are related to the noncentrality parameter (NCP) of the chi-square distribution that the involved test statistic is implicitly assumed to follow. Existing literature suggests that few statistics can be well approximated by chi-square distributions. The meaning of the NCP is not clear when the behavior of the statistic cannot be described by a chi-square distribution. In this paper we define a new measure of model misfit (MMM) as the difference between the expected values of a statistic under the alternative and null hypotheses. This definition does not need to assume that the population covariance matrix is in the vicinity of the proposed model, nor does it need for the test statistic to follow any distribution of a known form. The MMM does not necessarily equal the discrepancy between the model and the population covariance matrix as has been assumed in existing literature. Bootstrap approaches to estimating the MMM and a related quantity are developed. An algorithm for obtaining bootstrap confidence intervals of the MMM is constructed. Examples with practical data sets contrast several measures of model misfit. The quantile-quantile plot is used to illustrate the unrealistic nature of chi-square distribution assumptions under either the null or an alternative hypothesis in practice.

     

GSM无线公话产品中的干扰研究

GSM90 0 /1 80 0固定无线公用电话桌面型话机在开发过程中遇到严重的噪音问题 ,一度成为开发工作的瓶颈。本文就这一噪音问题进行了分析与测试 ,并针对干扰源采取相应的措施 ,在产品开发中付诸应用 ,最终解决了 GSM桌面型无线公话的噪音问题     

基于谐振原理的硅微机械加速度计

基于力学振动原理 ,导出敏感梁类谐振振动的微分方程 ,给出了振梁型加速度计的设计原理。指出了加速度计谐振梁频率的相对变化量与梁的厚度无关 ;为避免输出非线性频率信号 ,频率的相对变化率和激励振动的振幅都不宜太大     

企业中层管理人员培训的思考

以分析企业中层管理人员培训的现状为突破口,阐述了中层管理人员培训需求分析的思路和方法。在此基础上对培训内容进行整体设计,指出针对此类培训应采用的培训方式和评估方法。以期对企业中层管理人员的培训起到一些启发和借鉴作用。     

基于TMS320VC5410的最小系统设计

TMS320VC5410是TI公司生产的一款定点数字信号处理(DSP)芯片。基于DSP的最小系统是以其简洁的硬件结构来实现DSP的一般功能,广泛应用于工业生产、教学、科研、电子设计等领域。主要介绍了基于TMS320VC5410的最小系统硬件电路设计方案,阐述了重要电路部分的抗干扰设计和软件调试过程中应注意的若干问题。最后提出了简单易行的软件调试方法以及部分程序代码。