碳酸钕对AZ91合金组织的细化和腐蚀性能的影响

通过介绍实验条件实验方法及结果,并对其进行讨论,研究碳酸钕对A291合金组织的细化和腐蚀性能的影响。     

一种基于椭圆曲线的数字签名方案

基于椭圆曲线离散对数问题的数字签名系统使用的签名协议主要来自于签名等式的不同变形,方案所使用的协议也是如此,该协议面向实现进行了优化,从而整个系统更加高效。还给出了该方案的安全性分析。     

盲孔法测量复合材料残余应力释放应变矩阵的有限元分析

对盲孔法测量正交各向异性复合材料残余应力释放应变矩阵进行有限元分析.以碳/环氧正交各向异性材料板为基础,对于不同孔深的盲孔进行有限元计算,得出与其相对应的释放应变矩阵,并分析孔深对释放应变矩阵的影响.为实际工程中残余应力的测试奠定了基础.     

报关舱单及其XML设计

通关速度是国际贸易的要素,报关方式是通关速度的关键。本文以工程资料为背景,详细论述报关舱单采用的W eb报关方式及其捆绑的XML设计。通过对设计原理的分析,可以看出:基于B/S的数据发送方式使报关流程更简洁、作业更开放,因而大大地加快了通关速度,为国民经济的发展做出一点贡献。     

Ontology-Based Semantic Annotation for Problem Set Archives in the Web

0 IntroductionAsneim mapnotircta nWte pbre i-sco tnhdieti oabnilfiotry r etaoli zainnngotthatee go aWle obf trhe-esources with semanticinformation[1]. However ,annotationtools so far basically allowthe user to annotate with plaintext using the method of information extraction.In manycases ,one can hardly extract semantics from Web docu-ments ,such as problemset archivesinthe Web.Massive problemset archives are availableinthe Web,for example,http://acm.uva.es, while each problemsetarchives pr…     

Detecting myocardial ischemia with 2-D CVIB imaging method--an in vivo animal experiment study

A 2-D cyclic variation of integrated backscatter (CVIB) imaging method was established for detecting myocardial ischemia. To demonstrate the feasibility and validity of this method, animal experiments were conducted. Acute myocardial ischemia was induced by occluding left anterior descending coronary artery in 10 anesthetized open-chest dogs. While scanning the normal hearts and the ischemic hearts with a B scanner, digital radiofrequency data were acquired by a real-time acquisition system in synchronism. The offline analysis to the radio-frequency signal with the 2-D CVIB imaging method was performed to verify the consistency between the imaging result and the design of the experiment. In addition, 4 dogs in experiment were treated with the heart pacemaker in order to investigate the influence of changing in heart rate on the detection of ischemic myocardium with the proposed method. The experimental result showed that the 2-D CVIB imaging method succeeded in detecting the ischemic myocardium and is a new non-invasive way for the cardiologists to both quantitatively and visually evaluate the contractile performance of the myocardium.     

改进的EP法在稳定渗流分析中的应用

为了提高稳定渗流分析中自由面处的模拟精度，通过分析EP(extended pressure)法的控制方程及其离散格式，指出分段连续函数hε(p)中参数ε的选取对计算精度影响显著，提出ε取值为网格点在y方向上间距的一半更合理，得到了改进的EP法，通过数值实验，将此方法的结果与已有结果对比，证实改进后自由面光滑，逸出点位置合理，模拟精度较高。     

低沸点烷烃Kovats指数的拓扑结构研究

本文应用拓扑指数法研究烷烃化合物的色谱保留指数，并通过多元回归分析得到了烷烃的拓扑结构与色谱保留指数的良好的相关性，当测得某一有机物的保留指数时便可估计其结构特征，从而为烷烃化合物的色谱定性分析提供了可靠的信息。     

试论村庄下采煤的技术问题

文章讨论了村庄下采煤的技术问题。     

使用MPLS解决网络最大流问题的方法

为解决大多数的流量工程问题和网络传输中的最大流问题，该文提出了基于多协议标签交换（MPLS）解决方案，阐述了解决最大流问题的数学方法，提出一种独特的将数据流划分成“微分支”的思想和方法，并介绍微分支的建立过程；给出仿真结果。