用双光电门研究变加速运动

本文介绍了在气垫导轨上运用双光电门研究变加速运动的方法。     

地铁车站的客流模拟

本文以上海地铁车站（一号线）结构设计图为基础，对车站乘客流动状况建立随机模型，产生车站建成运行后乘客流动情况的模拟图形，从而验证车站设计的合理性，并可辅助车站设计。     

概率思想在数学证明和计算中的应用

通过多个典型实例说明了古典概型、概率密度函数、分布函数、Cauchy—Schwarz不等式、Chebeshev不等式、数字特征等在数学证明和计算中的应用,提出了在概率论教学中对概率思想在数学证明和计算中的应用应加以介绍.     

A UNIFIED ISOSTATIC DATUM AND ITS APPLICATION IN SEA LEVEL CHANGE RESEARCH

The necessity of establishing a Unified Isostatic Datum (UID) for studying the sea levelchanges along the coast of China is discussed in this paper. A so-called Coastal Land Ver-tical Movement Isostatic Datum (CLVMID) is established based on precise releveling dataperformed from the 1950s to 1980s and some coniunction releveling data with tide stations.All the data consists of about 250,000 km releveling lines and covers the whole mainland ofChina. As examples, datum corrections for sea level changes derived from two tide stationsand recent crustal vertical movement in the Yangtse Delta area relative to the datum aregiven to explain the significance of the isostatic datum in the research of the sea levelchange trend.     

振动分离流化床中沉积组分的运动速度

本文在槽式振动流化床中研究沉积组分的运动特性，分别考察了振动参数，振动角度及床体倾角对运动速度的影响，根据碰撞理论推导出沉积组分的抛掷高度和物料运动速度的计算式，同时与实验值进行了比较，且研究了振动参数和物料的运动速度对焦渣混合物的分选效率的影响。     

关于颗粒悬浮机理和悬浮动的讨论

从分析气体分子的悬浮和静水中Ｂｒｏｗｎ微粒的悬浮之机理出发，论述了重力场中粒子（分子、微粒等）的悬浮不一定需要其它外力，粒子本身的任何形式的无规则运动，达到一定强度后都能使粒子弥散悬浮．河流中的泥沙颗粒和气（水）力输送管道中的颗粒的悬浮也主要靠颗粒物的无规则运动．作用于颗粒的升力和其它力可改变颗粒悬浮沿高度的分布，但仅用这些力（若无任何无规则运动）无法解释颗粒的弥散悬浮状态．讨论了颗粒对流动阻力的双重作用：支持颗粒悬浮的湍流脉动因引入颗粒而削弱，这是颗粒的减阻作用；颗粒增阻的一个主要机制是，流体给予颗粒的水平动量在颗粒一壁面碰撞中不断地损失．用悬浮动概念解释颗粒引起的增阻是不正确的．     

Numerical approximation of anisotropic geometric evolution equations in the plane

Harald Garcke Naturwissenchaftliche Fakultät I' Mathematik, Universität Regensburg, 93040 Regensburg, Germany Robert Nürnberg Department of Mathematics, Imperial College London, London SW7 2AZ, UK Received on 13 April 2006. Revised on 20 February 2007. We present a variational formulation of fully anisotropic motionby surface diffusion and mean curvature flow, as well as relatedflows. The proposed scheme covers both the closed-curve caseand the case of curves that are connected via triple junctionpoints. On introducing a parametric finite-element approximation,we prove stability bounds and report on numerical experiments,including regularized crystalline mean curvature flow and regularizedcrystalline surface diffusion. The presented scheme has verygood properties with respect to the distribution of mesh pointsand, if applicable, area conservation.     

An ALE mesh movement scheme for long‐term in‐flight ice accretion

The rather irregular shapes that glaze ice may grow into while accreting over the surface of an aircraft represent a major difficulty in the numerical simulation of long periods of in‐flight icing. There is a constant need for remeshing: a wasteful procedure. In the framework of ALE formulations, a mesh movement scheme is presented, in which frame and elasticity analogies are loosely coupled. The resulting deformed mesh preserves the quality of elements, especially in the near‐wall region, where accurate prediction of heat flux and shear stresses is required. The proposed scheme handles mesh deformation in a computationally efficient manner by localizing the mesh deformation. The 2D problem of ice accretion over single and multi‐element airfoils is considered here as a numerical experiment. Experimentally measured glaze ice shapes were used to evaluate the performance of the present approach. Copyright © 2011 John Wiley & Sons, Ltd.     

一种基于“把思想变成程序”的MIS自动生成系统

在分析管理信息系统传统功能、结构、开发过程、开发手段、交互方式的基础上并以“把思想变成程序”为目标，提出一个根据需求分析和详细设计的结果自动生成ＭＩＳ（管理信息系统）程序的自动生成系统，并阐述系统的设计和技术实现．文中所阐述的内容是已完成的科研课题的研究内容     

Gyroscopic signal smoothness assessment by geometric jolt estimation

The present contribution focuses on the estimation of the geometric acceleration and of the geometric jolt (namely, the derivative of the acceleration) of a multidimensional, structured gyroscopic signal. A gyroscopic signal encodes the instantaneous orientation of a rigid body during a full three‐dimensional rotation that is regarded as a trajectory in the curved space SO(3) of the special orthogonal matrices. The geometric acceleration and jolt associated to a gyroscopic signal are evaluated through the rules of calculus prescribed by differential geometry. Such an endeavor is motivated by recent studies on the smoothness of human body movement in biomechanical engineering, sports science, and rehabilitation neuroengineering. Two indexes of smoothness are compared, namely, a normalized proper geometric acceleration index and a normalized proper geometric jolt index. Our investigation concludes that, in the considered experiments with measured signals, for relatively low values of the acceleration and of the jolt indexes, such indexes are strongly positively correlated. Copyright © 2017 John Wiley & Sons, Ltd.