地铁闸机紧急放行控制器的探讨

为了保证紧急情况下乘客的安全,地铁各车站均安装有紧急按钮,用于控制闸机的紧急放行。介绍了闸机紧急放行控制器系统构成和工作原理,分析了闸机异常放行的主要原因,并对紧急按钮采用常闭接点和常开接点的优缺点做了比较。使用常闭方式更能及时发现故障,保证紧急放行时能及时响应。     

模糊层次分析法在高技术企业创业环境评价中的应用

研究高技术企业创业环境评价问题，运用系统分析方法构建了高技术企业创业环境评价指标体系，在此基础上深入研究了模糊层次分析法在高技术企业创业环境评价中的具体运用．结果表明模糊层次分析法是高技术企业创业环境评价的一个新的、有效的方法，最后对模糊层次分析法应用的局限性作了简要的分析．     

Assessment of the volume of fluid method for free-surface wave flow

This study was concerned with the free-surface wave flow around a surface-piercing foil. The volume of fluid method implemented in a Navier–Stokes computational fluid dynamics code was employed. Three widely used discretization schemes for the volume of fluid method were assessed for a test case that involved general ship waves, spilling breaking waves in front of the leading edge, and bubbly free surfaces in separated regions. A single computational approach was selected for the comparison, and a grid-dependence study was carried out. The computational results were validated against existing experimental data, showing good agreement. The validation results suggest that all three discretization schemes perform well, but the best and most efficient results were obtained using the high-resolution interface capturing scheme.     

Tangential force variation due to the bogie direction reversal procedure

A range of tangential forces is generated within the contact patch when a wheelset moves on the rail. These forces are intensified when incorporating curved tracks and motored axle rail vehicles [Arrus, P., de Pater, A.D. and Meyers, P., 2002, The stationary motion of a one-axle vehicle along a circular curve with real rail and wheel profiles. Vehicle System Dynamics, 37(1), 29–58]. The wheelset is subject to flange contact if an unbalanced force remains in a curve towards the high rail gauge face. The resultant force in the transverse direction includes the lateral force, the radial force, and the creep forces in addition to the effect of the frequent wheelset displacement due to the kinematic oscillation [Iwnicki, S., 2003, Simulation of wheel–rail contact forces. Fatigue Fracture Engineering Material Structure, 26, 887–900]. This article has focused on a potential variation in some of the forces cited when the wheelset is subject to backward and forward movements. A severe wear rate observed within the wheel flange region in Iranian Railways was investigated by operating a test bogie on a curvaceous track. An obvious improvement in the wear rate and wear pattern of the wheels was attained when the second test bogie encountered a bogie direction reversal procedure. This enhancement is considered in this article from the force analysis standpoint.     

美国对伊态度的新变化——对伊朗核问题报道的积极话语分析

采取Fairclough的语篇分析三维模式为主要框架，以系统功能语法中的语境理论为依托，借助评价理论为具体分析工具，从“建构”的视角对选自美国“纽约时报”2007年9月27日刊登的一篇关于伊朗核问题的新闻报道进行积极话语分析，并运用Fauconnier和Turner的概念整合理论对分析结果作进一步论证，发掘出美国对伊一贯强硬态度的变化．     

区域综合交通规划环境影响评价指标体系研究

近年来,区域综合交通规划取得蓬勃发展,但相应的规划环评还处于实践探索阶段,环评指标在累积性评价、运输结构优化、“三线一单”新要求等方面尚存短板。在充分研究公路、铁路、航空、港口、航道等单项交通规划环评和现有综合交通规划环评案例指标的基础上,根据区域综合交通规划及其环境影响的特征,按照科学性和系统性、综合性和宏观性、政策性和导向性、操作性和适用性的原则,提出了区域综合交通规划环评指标体系。分为生态功能、环境质量、资源能源等3大类,生态系统结构、生态敏感区、生物多样性、水环境、大气环境、环境风险、土地资源、水资源、岸线资源、能源等10方面共19个指标,逐项反馈于规划的总体规模、空间布局和运输结构。     

关于IE在重卡制造业中的应用

介绍了某重卡调整线运用IE手法,引入工业工程中的作业分析、程序分析、作业分析、动作分析等方法和思想,对生产线进行改善。     

EFFECT OF EPIMEDIUM FLAVONE TOTAL(EFT) ON THE IMMUNOFUNCTION OF EHRLICH ASCITES CANCER(EAC) BEARING MICE

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主动声纳的低截获性数字仿真研究

在现代海战中,舰艇面临着越来越严峻的敌方侦察声纳的威胁.低截获是一项非常诱人的技术.低截获声纳通过选择合适的发射信号,在保持探测能力的同时,降低被敌方侦察声纳截获的概率.采用数字仿真的形式,分析浅海侦察声纳信号能量的变化,研究主动声纳的低截获性.仿真结果表明在高斯噪声背景下,主动声纳实现低截获性相当困难.     

Alcohol and traffic accidents in Japan

Alcohol induces many traffic accidents. Recently, the number of incidences of driving under the influence of alcohol (DUIA) has decreased in Japan; however, the number of drink-driving situations remains constant. Toughening the penalty has not been a particularly effective method for reducing the number of DUIAs. To reduce accidents resulting from DUIA, an approach other than sanctions may be necessary. Alcohol impairs attentional control for simple tasks and increases the propensity for risk-taking behavior; these are the major perils of DUIA. There are many risk factors for DUIA, including area, time, personal traits, the use of other substances, and alcohol use disorder. Each individual has a different risk factor for drink-driving, so it is important to provide more education for individuals and interventions for alcohol usage according to each risk factor.