铜陵市轮渡码头对长江河势及行洪影响分析

本文概述了铜陵市拟建轮渡所码头结构型式及所在河段基本概况 ,分析了拟建码头对长江河势及行洪所产生的影响 ,计算了由此而引起的局部流速及局部壅水高度增加值范围 ,从而提出在长江岸边兴建码头对河势和防洪方面的可行性     

非创性检查指标与肺动脉高压的回归分析

通过多元逐步回归分析发现,空间隔缺损大小(X_2)、动脉血氧分压(X_3)、V_?/V_?(X_7)与肺动脉收缩压(Y_1)、肺动脉舒张压(Y_2)、肺动脉平均压(Y_3)之间关系密切,而被列入回归方程。其方程分别为Y_1=13.24+0.22X_2—0.70X_3+0.14X_7;Y_2=0.65+0.24X_2+0.12X_7;Y_3=3.54+0.17X_2+0.16X_7。而病和、∑_9导联QRS振幅、右_实/右_标和左_实/左_标是次要因素,未列入回归方程。上述方程的产生,有可能避免轻、中度肺动脉高压患者心导管有创性检查,并减少相应的并发症。     

On the application of the Haskind-Hanaoka relations to hydroelasticity problems

The Haskind-Hanaoka relations for obtaining the wave-exciting forces, given the incoming and radiation potentials in floating rigid-body dynamics, are extended to deformable-body dynamics in the presence of a free surface and within the assumption of linear potentials theory. These relations are applied to the mode-superposition and the direct methods of solution of hydroelasticity problems. In other words, it is shown that regardless of the structural analysis method used in a hydroelasticity problem, the Haskind-Hanaoka relations can be used to calculate the wave-exciting forces without solving for the diffraction potential explicitly. These relations can also be used in the composite singularity distribution method to increase further the computational efficiency.     

DIFFERENTIAL DIAGNOSIS IN THE INTRACRANIAL DISEASES： PROTON MAGNETIC RESONANCE SPECTROSCOPY STUDY

Protonmagneticresonancespectroscopy (1H MRS)isanewtechniqueoffunctionalimaginginbrainandprovidesauniquenoninvasivetoolforex aminingmetabolisminvivonow .Inrecentyear ,therearesomereportsaboutprotonMRSingrowthofbrainandhypoxia ischemicencephalopathy(HIE) [1- 4] ,butfewarticlesaboutclinicalapplica tionofprotonMRSindiagnosistumoursandtheirdifferentiationfromnon neoplasticlesions .WestudiedMRSin 38braintumorsand 14brainnon neoplasticlesions.Herewereporttheresults .MATERIALSANDMethods1　…     

45英尺箱的曲折发展历程

45英尺集装箱（亦即ISO 1EEE／1EE箱型）已经被国际标准化组织集装箱技术委员会（ISO／rC104）列为研究和讨论的重点开发项目之一。尽管对该项目研讨的技术思路已经基本趋于一致，但是要见到ISO1496—1、ISO1161和ISO3874的新版本恐怕还要耐心等候一段时间。现在，让我们重温该等箱型发展的曲折历程，学习为此做出贡献的同行们不断探索和创新的精神。     

由一个香港集装箱港口的管理想到的

近几年来,随着改革开放的深入,人们都已经认识到在社会主义市场经济体制下,管理是企业的生命,只有适应市场,促进管理,才有可能最大限度地挖掘企业潜力,提高经济效益.在同样激烈的市场竞争条件下,有的企业能够稳定发展,逐步壮大,而有的企业却连续下滑,岌岌可危.从主观方面找原因,关键在于管理工作.     

A case study of Beijing bus crew scheduling: a variable neighborhood‐based approach

Crew scheduling for bus drivers in large bus agencies is known to be a time‐consuming and cumbersome problem in transit operations planning. This paper investigates a new meta‐heuristics approach for solving real‐world bus‐driver scheduling problems. The drivers' work is represented as a series of successive pieces of work with time windows, and a variable neighborhood search (VNS) algorithm is employed to solve the problem of driver scheduling. Examination of the modeling procedure developed is performed by a case study of two depots of the Beijing Public Transport Group, one of the largest transit companies in the world. The results show that a VNS‐based algorithm can reduce total driver costs by up to 18.1%, implying that the VNS algorithm may be regarded as a good optimization technique to solve the bus‐driver scheduling problem. Copyright © 2015 John Wiley & Sons, Ltd.     

空间线形自锚式悬索桥大转角吊索技术研究

南京长江隧道工程江心洲右汉大桥为自锚式空间悬索桥,主缆从空缆状态到成桥状态,主缆横桥向位移较大,吊索须跟随主缆横向移动、转动及伸缩。通过一种新型的吊索结构,吊索可转动较大的角度,适应新型空间式悬索桥的问题,同时实现了吊索长度的调节。     

TETRA系统小区重选探讨

随着地下铁道运输事业的飞速发展,地铁线路不断增多,用于地铁通信的无线网络也在不断地扩张。越来越多的无线基站及直放站的投入使用,使无线网络由简单变得复杂,由此也带来各种新问题。例如,为了得到更好的服务质量,无线终端在移动过程中会根据测量结果进行小区重选,     

基于定位装置参数等效的接触网二维力学模型

接触网既是供电的线路,又是受电弓的滑道,其结构为三维柔性索网,当受电弓通过时,支持点和张力补偿点不存在瞬时大位移,其动态行为可以忽略,定位点由于存在非线性铰接,定位点处的动态行为不能被忽略。为等效定位点的动态行为,通过静力学分析,简化三维力学模型,将定位装置的三维非线性铰接等效为二维线性弹簧,并推导弹簧的等效刚度值计算公式,得到接触网二维力学模型。最后通过仿真实例,验证接触网二维力学模型的静态和动态效果与接触网三维模型完全吻合,并确认定位装置等效刚度的计算方法。