船舶卡的现状及发展趋势

对交通部直属海事系统配备的船舶卡及其相关的各个系统的功能进行了介绍,分析了船舶卡目前存在的缺陷,提出了相关建议。     

A discrete optimization approach for locating Automatic Vehicle Identification readers for the provision of roadway travel times

This paper develops an algorithm for optimally locating Automatic Vehicle Identification tag readers by maximizing the benefit that would accrue from measuring travel times on a transportation network. The problem is formulated as a quadratic 0–1 optimization problem where the objective function parameters represent benefit factors that capture the relevance of measuring travel times as reflected by the demand and travel time variability along specified trips. An optimization approach based on the Reformulation–Linearization Technique coupled with semidefinite programming concepts is designed to solve the formulated reader location problem. To illustrate the proposed methodology, we consider a transportation network that is comprised of freeway segments that might include merge, diverge, weaving, and bottleneck sections. In order to derive benefit factors for the various origin–destination pairs on this network, we employ a simulation package (INTEGRATION) in combination with a composite function, which estimates the travel time variability along a trip that is comprised of links that include any of the four identified sections. The simulation results are actually recorded as generic look-up tables that can be used for any such section for the purpose of computing the associated benefit factor coefficients. Computational results are presented using data pertaining to a freeway section in San Antonio, Texas, as well as synthetic test cases, to demonstrate the effectiveness of the proposed approach, and to study the sensitivity of the quality of the solution to variations in the number of available readers.     

浅议高校图书馆导读工作

导读工作是高校图书馆工作重点之一,本文讨论了高校图书馆导读工作的意义,提出了做好导读工作的措施以及导读工作对馆员素质的要求。     

公交IC卡信息处理的数据挖掘技术研究

主要探讨数据挖掘技术在公交IC卡信息处理方面的运用，设计了公交IC数据仓库结构，提出数据挖掘系统的框架。从公交运营决策者和公交规划者两个角度提出数据挖掘目标，并根据挖掘目标阐述数据分析过程及挖掘方法。     

A review of the Effect of a/W ratio on fracture toughness (II)—experimental investigation in LEFM

1 INTRODUCTIONThe linear elastic fracture mechanics provides auseful means of determining a material’s toughness.However, deeply cracked standard laboratory speci-mens those have high level of constraint may not alwaysbe representative of those found in structural compo-nents. Structural components often exhibit compara-tively shallowand surface-breaking.We have previously shown that shallow crackshave greater COD andJ-integral values at initiationthan deeply cracked specimens in EPFM…     

货船IC法防火绝缘设计探讨

在总结所设计货船的防火绝缘经验的基础上,介绍了规范要求的各级别防火分隔种类;指出了采用IC法对货船进行防火绝缘设计时需满足的规范要求;讨论了耐火分隔舱壁或甲板上有贯穿件及开口时,为保持耐火完整性而必须采取的保护方法;以及在防火绝缘设计过程中降低成本、优化设计的方法对船舶总体及内装设计人员有较高的参考价值。     

基于有限元分析和动力学仿真的曲轴疲劳寿命计算

基于某型十二缸内燃机曲轴的有限元模型,建立了包括曲轴、活塞组、连杆组及飞轮在内的三维实体动力学仿真模型,并考虑惯性力、气缸压力和相邻拐的影响.通过曲轴刚柔混合动力学仿真,计算了标准工况下曲轴的载荷历程曲线及最大应力,并利用全寿命方法(S-N法)得出了该曲轴的疲劳寿命.在此基础上,对内燃机负荷与曲轴疲劳寿命关系进行了分析,表明内燃机负荷对曲轴疲劳寿命有显著的影响.     

STUDY ON MAXIMUM SPECIFIC SLUDGE ACTIVITY OF DIFFERENT ANAEROBIC GRANULAR SLUDGE BY BATCH TESTS

IntroductionGranular sludge UASB (Up- flow AnaerobicSludge Bed) reactor is the most widely used anaer-obic waste water treatmentreactor in the world.Itbelongs to the second generation of modern anaero-bic reactor. EGSB(Expanded Granular SludgeBed) reactor is an even higher efficient anaerobicwastewater treatment reactor,which is developedin the past ten years based on the UASB technolo-gy.It belongs to the third generation of modernanaerobic reactor. EGSB includes two kinds oftypes:I…     

广州地铁金融IC卡基于ODA技术的应用探讨

金融IC卡在广州地铁自动售检票系统的应用,利用联机交易中卡片脱机认证过程与后台联机分异步完成的原理,创新性地提出脱机数据认证(offline data authentication,ODA)交易方案。在既有清分系统上建立金融IC卡交易管理平台,实现数据处理;金融IC卡等金融产品通过地铁专用网络把交易记录传送至清分中心,再由清分中心传送至金融IC卡交易管理平台,以处理相应的金融IC卡等金融产品的交易数据,最后根据相关接口和通信协议通过银联专用网络组织报文实现金融IC卡等相关金融产品的扣款交易。目前,广州地铁已在全线网开通受理金融IC卡,无论是本地市民还是外地游客,只要持具有银联"闪付"标识的信用卡即可刷卡过闸,进一步提升支付和出行的便捷性。     

移动支付在轨道交通自动售检票系统中的设计与应用

介绍移动支付自动售检票（AFC）的设计,在现有传统地铁AFC系统基础上,设计基于移动支付方式的新型AFC系统,对移动支付AFC系统设计的目标和各参与对接方的要求进行深入分析,对车票管理业务、车票应用业务、数据交换业务等移动支付AFC系统,以及系统对接设计、移动支付车票发行系统、数据交换子系统的业务进行设计与分析,最后给出系统的接口设计和系统的部署方案,体现了移动支付AFC系统的可靠性、安全性和优越性。