公共交通出行方式选择的演化博弈分析

选择公共交通出行方式或者其他出行方式对于出行者是一个博弈的过程,在这个过程中,出行者依据所获得的信息修正自己的行为策略。应用演化博弈论对出行者的出行方式选择进行分析,建立出行方式选择的演化模型,分析该模型并提出改善交通出行方式结构的策略。     

Investigation of cavitation inception characteristics of hydrofoil sections via a viscous approach

Unlike traditional approaches based on potential theory, this work investigated the cavitation inception characteristics of hydrofoil sections by solving Reynolds-averaged Navier–Stokes (RANS) equations. The viscous effects at high Reynolds numbers were taken into account through calculation of the eddy viscosity using a k- model. This viscous approach delivers the lift and drag forces in a more self-contained way, which cannot be obtained directly from the potential theory. A comparison with smooth surface measurements validates the proposed numerical method. Two approaches to include the roughness effects are also described. The predictions of cavitation bucket characteristics based on potential theory are more conservative than those reached by the proposed viscous computations. Hydrofoil sections with different camber ratios, foil thicknesses, and Reynolds numbers were studied numerically. A decrease in the Reynolds number tends to increase the cavitation-free region without changing the shape of the steep region. An increase in foil thickness gives a range increase in the angle of attack where no cavitation is expected. An increase in the camber ratio moves the cavitation-free location of the angle of attack, and slightly increases its range.     

矩形和圆形截面重力式桥墩台双向偏心受压下截面极限承载力实用计算方法

通过对影响矩形和圆形截面重力式桥墩台在双向偏心受压下截面极限承载力计算结果的多元回归分析 ,给出一种简单、实用且能满足工程精度要求的计算公式     

整体多片式T梁的横截面框架效应分析

主要通过对秦沈客运专线整体多片式 16mT梁桥的空间有限元分析和平面结构分析 ,研究整体多片式T梁的横截面框架效应 ,提出合理的简化计算方法。     

浅埋软弱围岩地段双联拱隧道衬砌结构计算分析

通过对两个工程计算实例的介绍，阐述了高速公路双联拱隧道衬砌结构计算的思路和方法。通过对计算结果的分析，指出在浅埋软弱围岩地段，双联拱隧道衬砌结构设计应注意的一些问题，并提出解决问题的方法和建议。     

公路衡重式挡土墙优化设计方法与应用研究

针对公路衡重式挡土墙常规设计存在的诸种不合理现象，并结合已有挡土墙优化设计方法的缺陷，采用混合遗传算法进行衡重式挡土墙的优化设计，并编制了相应的程序，工程应用效果良好。     

LOW-COST HIGH PERFORMANCE CLUSTER OF WORK-STATIONS BASED ON DYNAMIC LOAD BALANCING FOR PARALLEL DEPTH-FIRST SEARCH(DFS)

IntroductionTraditionally,supercomputers have been builtwith high performance processors,which use tech-niques to execute as many computations concur-rently as possible.This machine employs a numberof arithmetic units,and sufficient hardware to al-low them to be fed with data and instructions attheir peak rate. Supercomputers built as parallelprocessors have also contained special shared mem-ory or message passing hardware as an integralpart of the machines design. This special hard-ware,in co…     

测定简单多边形凸包的快速算法

计算凸包问题不仅是计算几何的基本工具之一,而且在实际应用中也是很重要的,本文运用Graham扫描技术及双动线检验的方法,构造了测定简单多边形凸包的O(n)快速算法。     

压接式IGBT模块的热学特性研究

使用3种方法研究了压接式IGBT模块的热学特性,建立模块热学模型并通过数值计算和有限元仿真的方法分析其稳态热阻特性,搭建实物测试台,通过温度参数定标等方式间接测量模块热阻特性,最后对采用3种方法的结果进行了分析比较。     

波浪中螺旋桨推力变化的近似计算

螺旋桨在波浪中随船运动是前进、旋转和振荡三者的结合。本文近似计算波浪中桨流体动力性能相对于静水中性能的变化,将波浪中螺旋桨运动分解为旋转兴波和振荡兴波两部分线性迭加。利用Ｇｒｅｅｎ函数法,求解其兴波问题,给出桨推力的变化值。编制程序进行了系列数值计算。结果表明,波浪中螺旋桨推力系数变化值随桨轴浸深、桨升沉振荡频率和幅值而变化。