Study on J-integral with SENB specimensin a condenser material

A series of tests was performed with three-point single-edge-notched-bend (SENB) specimens in a condenser material (Titanium alloy). Results show that the J-integral values of welded joint and HAZ are obviously smaller than those of the base metal. It signifies that the welding process can result in a reduced toughness of Titanium alloy and the effect of crack orientation on toughness value is not negligible for engineering applications. Besides, the J-integral values of L-T direction specimens are much higher than those of LS ones. The J-integral values of rolled ring are: J_(C-R)>J_(C-L)>J_(L-R).     

短波通信中的Turbo均衡技术及应用

研究了turbo均衡原理及几种均衡算法，并针对具有严重ISI的短波信道，在信道参数已知和不匹配的情况下，对不同的联合均衡和译码算法、不同迭代次数对系统性能的影响进行了仿真和比较，结果表明，MMSE／SOVA算法在迭代几次以后具有良好的误码性能和鲁棒性，且计算复杂度低，利于工程实现。     

Law enforcement in the ocean

The combating of the present great variety of criminal activities occurring at sea mainly involves measures to be taken on land, in particular in ports.However, also actual enforcement at sea will continue to play an essential (complementary) role. This article surveys the rules of international law governing law enforcement measures at sea. These rules are complex, because distinctions have to be made between the various jurisdictional zones at sea and between the positions of the flag state, the coastal state and the port state. Traditionally, ships in the high seas (all sea areas beyond a narrow band of territorial sea) were under the exclusive jurisdiction of the flag state. In an increasing number of situations, the coastal state now has law enforcement authority over foreign ships in expanded areas up to 200 nautical miles offshore. But apart from these situations, flag state jurisdiction still prevails beyond the territorial sea. This makes effective law enforcement difficult. In practice, many obstacles can be overcome by making more effective use of the authority of the port state, and by concluding new international agreements providing for specific enforcement systems.     

广州机务段股道管理自动化系统的设计方案

广州机务段整备场的改造，按照铁道部科教装函[2000]年171号文件关于《机务段股道管理自动化系统技术方案》的原则，经过多个方案比选后，决定采用道岔集中控制系统和图像监视系统。本文主要针对道岔集中控制系统方案进行阐述。     

建筑工程合同管理信息系统浅析

我国加入WTO后,建筑企业已面向国际市场,参与国际竞争,但合同管理仍是我国国际承包工程管理中最薄弱的环节之一。本文从我国实际情况出发,说明了我国实行建筑工程合同管理信息系统的必要性,并对合同管理信息系统的开发和设计提出了基本构架。     

浅析海事管理信息系统的构成

分析海事管理业务的特点的基础上,分析客户机/服务器(Client/Sever)和浏览器/服务器(Browser/Sever)两种模式的特点进而对海事管理信息系统的构成进行分析论述.     

桩基设计中桩侧土的负摩阻力问题

介绍桩基设计中桩侧负摩阻力的产生条件以及负摩阻力的计算方法。     

受电弓与接触网间的接触压力检测研究

弓网接触压力是衡量受流质量的一个重要指标。本文提出了一种在受电弓上安装4个压力传感器及1个加速度传感器来检测接触压力的方法,考虑了受电弓的惯性力。介绍了一种用FSO系统把信号传输到低压侧的新的数据传输方式,并提出了一套评价接触压力的算法,能智能地自动判断受流是否正常。     

上海新港区金山咀入海航道比选

本文是上海港务局委托的金山咀新港区通航第三代集装箱船可行性研究成果的一部分。作者首先简略地介绍了杭州湾3条航道的现状,提出了北、中、南3条航线供最后比较选择,然后依据近年的潮位资料进行了分析、计算,预测乘潮过浅的能力,最后得出了航线比选的结论:以大戢山灯桩为起始点的杭州湾南航道为最佳航线,通航吃水以10.5m以下船舶为宜;吃水11.0m以上船舶进入杭州湾已相当困难,故在杭州湾要通航第三代集装箱船应对航道浅段疏浚增深。