浅析海盗的特点及其预防对策

本文简单介绍了全球海盗存在的现状,类型及其特点,详细论述了其预防对策,为航行在国际航线上的驾驶员提供借鉴.     

简析提高桥梁抗震能力的设计方法

改革开放以来,我国桥梁工程建设规模,工程项目施工的数量都有很大的发展。在桥梁的设计和施工时,技术人员需要做好桥梁的防震设计。通过科学的技术手段能够有效地提高桥梁的抗震能力,保证桥梁的通行安全。该文对提高桥梁抗震能力的设计方法进行了探讨和分析。     

论公路工程质量控制措施

我国公路工程质量控制的标准和要求很高,为了达到规定的目标,各方必须重视以及加强公路工程施工当中的质量控制。鉴于此,介绍公路工程施工质量控制的原则以及现存的主要问题,并提出质量控制的有效措施。     

开孔率对开孔板消浪效果影响的数值模拟研究

采用VOF方法,结合k-ε紊流模型建立数值波浪水槽。造波边界采用内源造波法,造波边界后方和波浪水槽出口边界均采用海绵层消波,自由面采用F函数追踪,从而数值模拟了波浪对开孔板的作用。将开孔板前波浪反射系数的数值计算结果与文献[14]的物理模型实验结果进行比较,验证所建立的数值模型及计算方法的正确性。通过改变开孔率,模拟波浪与开孔板作用的开孔板前波浪的反射系数,进而分析了开孔率与波浪反射率的关系。同时,分析了波浪作用下开孔板的迎浪面与背浪面的点压力差变化,并主要探讨开孔率与点压力差的相互影响关系。分析结果表明:随着开孔率α的增大,反射率减小,透射率增大,点压差呈非线性变化。     

基于能量优化法的船型快速设计

为使船型设计不再局限于母型的束缚,能够根据设计参数快速生成光顺的船体曲面,基于对船体曲线特征的分析,给出了具体的船型设计参数,提出了利用能量优化方法,以船体曲线的曲率平方和最小为优化目标,求解基于NURBS表达的、光顺的船体型线的设计方法。该方法可以在插值点、导矢、曲率、面积及形心等相关约束下调整船体曲线的基本形状特征,保证船体曲面的光顺性,实现船体曲面的NURBS表达。通过对某一条船的设计,证明了该设计方法的可行性和实用性。     

山区公路险要路段路侧护栏的优化设计

结合HYPERMESH和LS-DYNA,对护栏、道路以及车辆碰撞模型体系进行整合,最终建立起完整的碰撞模型体系.由LS-DYNA对不同的护栏设计方案进行仿真计算,得到了各个试验中的车辆行驶轨迹、车辆速度、加速度、车辆与护栏的位移、碰撞模型体系的接触界面力、碰撞过程中能量的转化情况、等效应力以及塑性应变等,并使用LS-PREPOST对这些数值进行了详细的分析.对比所有试验结果,结合护栏选择原则,得出了护栏设计方案中最合理的方案.     

Layout design-based research on optimization and assessment method for shipbuilding workshop

The research study proposes to examine a three-dimensional visualization program, emphasizing on improving genetic algorithms through the optimization of a layout design-based standard and discrete shipbuilding workshop. By utilizing a steel processing workshop as an example, the principle of minimum logistic costs will be implemented to obtain an ideological equipment layout, and a mathematical model. The objectiveness is to minimize the total necessary distance traveled between machines. An improved control operator is implemented to improve the iterative efficiency of the genetic algorithm, and yield relevant parameters. The Computer Aided Tri-Dimensional Interface Application (CATIA) software is applied to establish the manufacturing resource base and parametric model of the steel processing workshop. Based on the results of optimized planar logistics, a visual parametric model of the steel processing workshop is constructed, and qualitative and quantitative adjustments then are applied to the model. The method for evaluating the results of the layout is subsequently established through the utilization of AHP. In order to provide a mode of reference to the optimization and layout of the digitalized production workshop, the optimized discrete production workshop will possess a certain level of practical significance.     

Relationships among service quality,corporate image,customer satisfaction,and behavioral intention for the elderly in high speed rail services

Since the Taiwan High Speed Rail operations, Taiwan's transportation market entered into a new era. Because of its competitive service of speed, convenience, environmental concerns and comfort, the High Speed Rail has not only made significant changes but has played a significant role in Taiwan's transportation. However, Taiwan now is an aging society. Due to the physical constraints among the elderly, demands to redesign the traffic system and maintain transportation safety are essential considerations. In the current market, Taiwan's transportation construction is facing fewer barriers; however, it must still improve, especially considering the health of the elderly. Thus, this study investigates elderly passengers' demands and further examined the relationships among service quality, corporate image, customer satisfaction, and behavioral intention. According to empirical analytical results based on structural equation modeling (N = 341), satisfaction directly affected travel behaviors, while service quality and corporate image played indirect roles. In addition, service quality plays a significant role on the effect of satisfaction. This study provides empirical evidence to indicate the quality of the accessible environment affects not only the effectiveness and efficiency of service quality, but also, the corporate image. The results provide valuable references for critically managing the elderly's usage of the high speed rail transportation service. Copyright © 2011 John Wiley & Sons, Ltd.     

浅析欧洲隧道修建技术

中国是目前世界上隧道最多的国家,但在修建技术方面,与世界先进水平相比,仍有较大的差距,特别是在设计理念、机械化配套、信息化管理和工程质量控制方面,更值得我们学习和借鉴.笔者通过对欧洲隧道工程的参观、学习和交流体会,对隧道修建技术进行了浅显的剖析,期望能对我国隧道修建技术水平的提高起到借鉴作用.     

硅沥青雾封层技术的应用研究

硅沥青再生强化剂是一种性能优越的沥青路面养护材料,采用硅沥青雾封层技术可以提高沥青路面的性能指标,满足使用要求.从硅沥青再生还原材料的性能分析入手,介绍了硅沥青雾封层的技术优势及施工要点,为硅沥青预防性养护技术的推广应用提供了科学依据及技术支持.