The density wave in a new anisotropic continuum model

In this paper the new continuum traffic flow model proposed by Jiang et al is developed based on an improved car-following model, in which the speed gradient term replaces the density gradient term in the equation of motion. It overcomes the wrong-way travel which exists in many high-order continuum models. Based on the continuum version of car-following model, the condition for stable traffic flow is derived. Nonlinear analysis shows that the density fluctuation in traffic flow induces a variety of density waves. Near the onset of instability, a small disturbance could lead to solitons determined by the Korteweg-de-Vries （KdV） equation, and the soliton solution is derived.     

数据采集控制器ADAM—5510和上位机通信的实现

介绍了在VISUAL BASIC环境中研华公司的ADAM-5510数据采集控制器和上位机通信实现的方法。     

A <Emphasis Type="Italic">VU</Emphasis>-decomposition method for a second-order cone programming problem

A vu-decomposition method for solving a second-order cone problem is presented in this paper. It is first transformed into a nonlinear programming problem. Then, the structure of the Clarke subdifferential corresponding to the penalty function and some results of itsvu-decomposition are given. Under a certain condition, a twice continuously differentiable trajectory is computed to produce a second-order expansion of the objective function. A conceptual algorithm for solving this problem with a superlinear convergence rate is given.     

《超级画板》帮你教圆锥曲线（2）

上一讲我们介绍了与圆锥曲线有关的一些函数，最常用的圆锥曲线一般方程的函数命令“Conic Of Equation（A＊x2＋B＊x＊y＋C＊、y2＋D＊x＋E＊y＋F，）；”，有了此命令，基本上就能解决圆锥曲线作图的大部分问题．譬如绘制椭圆的标准方程，     

应用MATLAB统计工具箱进行教学评价

根据某学院教务部门提供的教学评价数据,利用MATLAB统计工具箱的多元统计回归命令和逐步回归命令,建立了学生对教师总体评价与各评价项目之间的四个回归模型.这些模型简单有效且逐步改进,由此能给教师提供一些合理的建议,以提高教学质量.     

基于AutoCAD的画法几何解题方法研究

提出采用AutoCAD中某些绘图方法的命令替代传统画法几何的解题方法来解决画法几何中的相关问题，使画法几何题解的正确程度和精确程度得到相应提高．     

Temperature dependence of ratio between dielectric anisotropy and order parameter in fluorinated nematic liquid crystals

Temperature dependence of ratio between dielectric anisotropy and order parameter of fluorinated nematic liquid crystal is investigated by using a semi-empirical molecular orbital package that can accurately calculate an angle between molecular dipole moment and long axis. We optimize the molecular conformations with three semi-empirical Hamiltonians AM1, PM3 and PM5, and then make a comparison between computational results and experimental measurements. It is shown that the results obtained from AM1 method are in good agreement with the measurements. The present study offers an applicable method to predict the dielectric properties of liquid crystal material.     

CONVERGENCE AND SUPERCONVERGENCE ANALYSIS OF LAGRANGE RECTANGULAR ELEMENTS WITH ANY ORDER ON ARBITRARY RECTANGULAR MESHES

This paper is to study the convergence and superconvergence of rectangular finite elements under anisotropic meshes. By using of the orthogonal expansion method, an anisotropic Lagrange interpolation is presented. The family of Lagrange rectangular elements with all the possible shape function spaces are considered, which cover the Intermediate families, Tensor-product families and Serendipity families. It is shown that the anisotropic interpolation error estimates hold for any order Sobolev norm. We extend the convergence and superconvergence result of rectangular finite elements to arbitrary rectangular meshes in a unified way.     

通用电子测量仪器自动测量系统的实现

现如今通用电子测量仪器具备了更宽的测量范围和更高的测量精度,因此通过构建基于这些仪器的自动测量系统来进一步提升测量效率就显得十分必要。以Agilent公司生产的E5072A矢量网络分析仪为例,利用LabVIEW开发平台和SCPI命令,构建了E5072A的自动测量系统。该系统能够极大的提高测量效率,移植性好,可以胜任一些耗时长、需定时测量等较繁复的测量工作。