电罗经专用虚拟数字示波器开发应用

介绍一种新型虚拟示波器-航海型电罗经专用虚拟数字示波器的开发,并讨论了其在电罗经的日常维护中的应用.阐述对虚拟数字存储示波器信号处理和结果显示部分的软件设计.所开发的虚拟数字示波器可以用于电罗经的日常维护与修理,具有较强的实用性.     

计算机自动控制热电偶检测系统

计算机自动控制热电偶检测系统是按照检定规程对检测精度要求采用数字PID控制，运用工业控制软件开发工具对炉温控制系统进行优化，使温控达到标准化，同时对标准偶和被检偶的数据采集、处理、检定结果进行综合分析。     

计算机自动控制热电偶检测系统

计算机自动控制热电偶检测系统是按照检定规程对检测精度要求采用数字PID控制，运用工业控制软件开发工具对炉温控制系统进行优化，使温控达到标准化，同时对标准偶和被检偶的数据采集，处理，检定结果进行综合分析。     

压力传感器自动检定系统设计

针对压力传感器检定过程中实验数据量大,处理流程复杂,容易产生人为误差这一现象,建立了一套压力传感器自动检定系统.介绍了该系统的工作原理、系统组成和基于Labwindows/CVI的自动检定软件设计方法.该系统实现了压力传感器检定过程中的测试数据自动采集和记录、检定数据自动处理、结果打印等功能.压力传感器自动检定系统与传统的检定方法相比,不但提高了检定效率,减少了人为误差,而且对检定系统的准确度和稳定性也有了提高,同时使整个检定系统更加系统化、规范化.     

数字示波器特性及应用

本文对数字示波器的带宽特性及取样速率进行了简要描述,并分析了其在实际应用中对波形测试的影响。     

氯离子扩散系数测定仪标准与计量技术

氯离子扩散系数测定仪是用于测量混凝土抗氯离子侵蚀强度的检测设备,被广泛应用于水运工程领域混凝土耐久性检测试验,其工作性能和计量性能直接关系着测量结果的准确性,测量结果不准确将为水工建筑物的安全使用带来隐患。本文对影响检测结果的产品规格与性能提出具体要求;选取数字多用表和精密电阻等标准器搭建串并联基本电路,采用电学测量法对氯离子扩散系数测定仪的电压和电流进行检定试验并给出检定方法,选取标准铂电阻和恒温水槽等标准器对氯离子扩散系数测定仪的温度参数进行检定试验并给出检定方法。研究成果用于水运工程氯离子扩散系数测定仪行业标准和计量检定规程的制定。     

电(气)动扭矩扳子的校准

由于在工业生产中电动(气动)扭矩扳子的广泛使用,所以对其校准技术的研究具有十分重要的意义。目前我国还没有制定专门针对电动(气动)扭矩板子的检定规程或校准规范,电动(气动)扭矩板子的检定/校准一般参照JJG 707-2003《扭矩板子检定规程》进行,但由于电动(气动)扭矩扳子和传统的手动扭矩扳子驱动方式的不同,使得两者的校准过程存在较大的区别,针对在电动(气动)扭矩扳子校准时应注意的问题做了简要阐述。     

基桩高应变仪计量检定规程制定的研究

文章介绍了交通运输部部门计量检定规程《基桩高应变仪》的编制过程。通过对范围、规范性引用文件、概述、计量性能要求等规程要素的研究,制定了规程编写的方案。选取样机进行了试验分析,测量结果论证了规程中检定项目及指标的合理性。规程的发布实施为工程基桩的检测提供了技术支持,将对统一基桩高应变仪计量性能要求、保障基桩高应变仪量值准确和量值传递的可靠性以及完善其量值溯源体系具有重要意义。     

多功能工作测力仪检定装置的探索

介绍了一种多功能工作测力仪检定装置的设计和研制,尤其对该装置在工作测力仪检定规程中零点方位偏差的测量方面做了探讨。     

非金属声波检测仪计量检定装置研究

非金属声波检测仪在水运工程结构检测中应用广泛,主要用于检测混凝土构件以及灌注桩等构件的内部是否存在断裂、空隙等内部缺陷,对保证工程质量起到极其重要的作用。新建的非金属声波检测仪计量检定装置由微机控制,具有大量程、高精度和高度自动化的特点,可用以检定/校准声波检测仪的技术性能是否符合规程要求,有效地解决水运工程领域非金属声波检测仪的量值溯源问题,成为水运工程计量体系的重要组成部分。文章着力阐述了利用声时法进行无损检测混凝土构件内部质量的基本原理以及计量检定装置的工作原理、方框图、计量标准的性能考核等。     

Errata

正In the paper"Influence of Fouling Assemblage on the Corrosion Behaviour of Mild Steel in the Coastal Waters of The Gulf of Mannar,India"in Vol.12,No.4,Page:509,References were lost,and the two authors’biographies were identical.The correct text is shown below.We apologize to the authors and our readers for any inconvenience caused by the errors.     

Journal of Marine Science and Application 2014 Sum. Contents

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第34届海洋、离岸及极地工程国际会议(英文)

正St.John's,Newfoundland,Canada,May 31-June 5,2015 OMAE2015 is the ideal forum for researchers,engineers,managers,technicians and students from the scientific and industrial communities from around the world to: meet and present advances in technology and its scientific support;     

联合作战计划和执行系统

全球指挥控制系统(GCCS)实施当前美国海军网络中心战信息基础设施的联合计划网络。联合作战计划和执行系统(JOPES)支持GCCS实现联合计划。JOPES有两类计划：时间不限的精密预案计划生成作战计划、方案计划或职能计划；时间敏感的危机行动计划生成作战命令或战役方案。前者在和平时期创建的作战计划是后者的计划基础，加速应付危机的能力。     

Eastbound or westbound ?

In terms of equal sailing distances, where is the inflexion when ships depart from ports in the Asian Continent to New York via Suez and/or Panama？
The answer is China South Port Group （Hong Kong, Shenzhen and Guangzhou）.     

Recent progress on wave induced loading measurements in warships

Recent measurements of wave induced hull strain and flexure in RN warships are presented together with the derivation of the current design criteria for extreme hull girder bending loads. The history of the development of the shipboard instrumentation used is given and recent developments to improve the quality and ease of analysis of the data are described. An unexpectedly high transverse asymmetry in the longitudinal strains measured in destroyers is shown to be the result of a combination of vertical and lateral bending in oblique seas. Finally recent theoretical comparisons between the loading of Deep-Vee hulls and conventional UK rounded bilge hulls are presented which demonstrate the higher loading experienced by this type of hull form.     

桥梁防撞设施物理模型试验

物理模型试验是预报防撞设施所受撞击力及优化设计方案的主要方法之一。结合杭州湾大桥柔性防撞设施及东海大桥独立式防撞体设计方案,阐述了船—防撞体撞击试验的基本原理、方法、试验方案及相关试验结果。提出了柔性防撞系统的优化方案。试验结果表明,该方案经济有效,可供预报类似桥梁防撞设施撞击力时参考。     

印尼某电厂码头水工建筑物设计

印尼某电厂项目码头水工建筑物包括码头、防波堤和护岸等主要组成部分。在该项目水工建筑物的设计过程中,综合考虑当地的自然条件、施工能力和材料来源等因素,不断优化结构选型和结构断面。根据不同使用要求,护岸分别采用直立式和斜坡式2种结构型式,推荐的设计方案节省投资、施工方便,可供同类工程设计参考。     

Impact of regulation on the performances of long-distance transport services: A comparison of the different approaches in Sweden and Norway

Despite the many socio-economic similarities between Sweden and Norway, differences in jurisdiction, organisation, cooperation, and financing of long-distance passenger train and coach services have led to the development of four distinctively different ways of serving the markets. This paper describes how the train and coach markets have developed in the two countries, with emphasis on regulatory and industrial structure and a couple of performance variables.Looking at passenger rail, both countries separated infrastructure from operation over a decade ago. However, while Norwegian rail is characterised by an almost monopoly supplier, rail services in Sweden are partly decentralised to the responsibility of county authorities and are widely subjected to competitive tendering. The rest of the network is about to be opened up for on-the-track competition. Swedish Rail (SJ) has spent the last decades consolidating its core business (passenger rail) and sold out its other businesses. In contrast, the Norwegian state rail (NSB) has expanded its business to become a major bus operator and property owner, with extensions also into the Swedish market.The coach industry was more recently deregulated in both countries. The Swedish coach market is dominated by privately owned companies operating services to and from Stockholm. In Norway, state-owned NSB is a major coach operator on medium distance routes, and is also the largest partner of Nor-Way Bussekspress which totally dominates long-distance coach services. Further, the Norwegian coach market is characterised by cross-ownership and cooperation which has enabled an extensive route network which covers most of Norway.We find distinct differences in achievements in the two modes and in the two countries. Swedish rail services have succeeded in winning market shares and in renewing and developing both infrastructure and service levels to a greater extent than the Norwegian model. On the other hand, the Norwegian coach market seems to be more developed and efficient compared to its Swedish counterpart.The paper concludes with a discussion on the possible links between the different approaches and the performance observed, with the aim to stimulate further and more detailed research on some important issues.     

开放式数据挖掘系统模型

目前国内已经出现了少量的数据挖掘相关产品。国内数据挖掘软件无论从数量还是质量上比较，都与国外软件存在着较大的差距。随着数据仓库技术的普及，数据挖掘应用的需求越来越强烈，如何缩短这种差距，研发数据挖掘软件产品成为国内业界的一个重要问题。通过引用目前国际通用数据挖掘标准技术来构建开放式的数据挖掘系统模型，该系统模型从可扩展性、可重用性、易用性等方面得到了加强。