粮食立筒仓裂缝开展的计算与比较

介绍了钢筋混凝土粮食立筒仓仓壁设计中水平配筋及裂缝控制的计算方法,及采用II级钢筋时用《混凝土结构设计规范(GBJ10-89)》计算的配筋,采用HRB335级钢筋时在现行《混凝土结构设计规范(GB50010—2002)》下的配筋,得出配筋率变化规律,从而了解各种情况下对工程造价的影响。     

虚拟移动终端大规模海洋监测数据实时传输方法

为满足沿岸海洋大规模海洋监测对数据传输的需求,提出虚拟移动终端大规模海洋监测数据实时传输方法。利用硬件装置采集待传输的海洋监测数据,并利用编码与压缩技术处理采集的监测数据。通过定位虚拟移动终端和接收终端的位置,形成实时传输链路,并在传输协议的约束下,实现大规模海洋监测数据的实时传输。通过对比实验发现,与传统数据实时传输方法相比,设计的数据传输方法的丢包率降低了2.19%。     

基于消息机制的MicroCAN协议开发与应用

设计了针对小型系统的MicroCAN总线协议．该协议规范了消息机制，实现数据传输单帧与多帧接口的统一，保障数据传输的可靠性；规范了大数据量传输机制，利用打包与解包技术，保障数据传输的正确性与高效性．详细阐述了协议的实现方法．该协议已成功应用于调距桨连续数据记录仪中，测试结果表明该协议具有高可靠性和高效性的特点．     

VLAN技术的应用

VLAN(虚拟局域网)是对连接到的第二层交换机端口的网络用户的逻辑分段，不受网络用户的物理位置限制而根据用户需求进行网络分段。VLAN可以根据网络用户的位置、作用、部门或者根据网络用户所使用的应用程序和协议来进行分组。一个VLAN可以在一个交换机或者跨交换机实现。基于交换机的虚拟局域网能够为局域网解决冲突域、广播域、带宽问题。     

基于FPGA的高速采样及处理装置设计

本文介绍了一种基于FPGA的高速数据采样及处理装置的设计。分析了高速采样及处理在大功率变流装置中的应用背景。介绍了采用FPGA实现高速采样及处理的优势以及具体的实现方法,描述了高速数据处理的原理及实现方法。通过Verilog编程完成了相关的功能要求,并在Quartus II环境下实现了功能的仿真验证。介绍了相关的硬件设计内容,器件选型分析,驱动编写等。最终通过Signal Tap II抓取了在实际硬件上模拟的工作过程,验证了设计的正确性。     

近海工程船只IBS环网设计与关键技术研究

该文根据近海工程船只实际情况,设计了一体化船桥网络。采用光纤环网组网方式,利用核心交换机和接入交换机同时工作,同时针对当前存在的几种环网保护协议做了一些探讨,重点介绍了RRPP环形网络保护协议,并在此基础上划分虚拟局域网,实现网络广播风暴的隔离,保证数据流量的合理传播,并简单探讨了3G及现场总线技术的应用。     

虚拟AIS航标显示存在的问题及应对策略

虚拟航标是在船舶自动识别系统的基础上发展起来的新型助航标志,旨在提升和增强航海保障部门的助航服务水平,已经广泛应用于应急沉船标识、船舶航路的划分、航道警戒区的设置等方面。在归纳、整理国际上关于虚拟AIS(Automatic Identification System)航标显示标准的基础上,结合船舶上雷达和ECDIS(Electronic Chart Display and Information System)实际显示虚拟AIS航标符号的调研结果,分析目前虚拟AIS航标在显示时存在的问题,并提出应对策略,以规范虚拟AIS航标的使用和管理,从而更好地为船舶航行安全服务。     

多用户分布式虚拟海洋战场环境系统MUDVOE的实现技术

介绍创建一个多用户分布式虚拟海洋战场环境系统的相关理论和技术.该系统采用客户-服务器的通信模式和TCP传输协议实现了客户端和服务器端之间的通信,采用基于图形与图象混合建模和绘制技术实现了虚拟海洋战场环境构造.最后给出了该系统实现的软、硬件平台和实验结果.     

三维虚拟海洋图像仿真在舰艇视觉中的应用

在计算机视觉环境下建立舰艇防御和攻击的虚拟场景的重点是对三维虚拟海洋图像的仿真实验,传统的三维虚拟海洋视景仿真中在操作进程和虚拟数据资源配置中采用单线程设计,无法实现并行处理,视景效果不好。提出一种基于海洋拓扑结构网孔分解的三维虚拟海洋仿真技术并应用在舰艇的被动防御视觉系统中。构建三维海洋环境下舰艇的视觉控制模型,在MPI的视景仿真渲染工具Vega Prime中进行海洋三维视景建模,采用海洋拓扑结构网孔分解算法进行三维虚拟海洋视景仿真方法改进,在舰艇防御视觉系统中实现舰艇防御三维视景仿真,实验结果表明,采用该方法进行视景仿真,三维虚拟海洋具有较好的实时视景仿真渲染效果,视点转换和视点控制流畅,提高了在三维海洋环境中实现舰艇视觉仿真的可观性和可靠性。     

MARIC与中国船级社签订年度合作计划

正近日,由中国船舶集团旗下中国船舶及海洋工程设计研究院(MARIC)与中国船级社在上海签订了年度合作计划,MARIC院长卢霖与中国船级社代表——上海规范研究所所长陈实等领导出席会议。双方在2017年签订的战略合作协议基础上,针对2020年的主要合作项目,对审图服务、船型开发及认可、规范、科研合作、技术交流及支持四个方面进一步展     

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;     

33rd International Conference on Ocean,Offshore and Arctic Engineering （OMAE2014）

正San Francisco,California,June 8-13,2014.OMAE 2014 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;·to exchange ideas and experiences whilst promoting technological progress and its application in industry·to promote international cooperation in ocean,offshore and arctic engineering.In line with the tradition of excellence of previous OMAE conferences,more than 900 technical papers are planned for presentation.Outreach for Engineers Specialty Forum This Specialty Forum is designed for students and professionals who may not be familiar with the Ocean and Offshore industry,as well as those who have just recently specialized in this field.     

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。     

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.     

The 11th International Conference on Hydrodynamics (ICHD 2014)

正19–24 October 2014 SingaporeCONFERENCE THEMES The overall aim of the ICHD Conference is to provide a forum for participants from around the world to review,discuss and present the latest developments in the broad discipline of hydrodynamics and fluid mechanics.The first International Conference on Hydrodynamics(ICHD)was initiated in 1994 in Wuxi,China.Since then,9 more ICHD conferences were held subsequently in Hong Kong,Seoul,Yokohama,Tainan,Perth,Ischia,Nantes,Shanghai and St Petersburg.Evidently the ICHD conference has become an important event among academics,researchers,engineers and operators,working in the fields closely related to the science and technology of hydrodynamics.The 11th ICHD will be held in Singapore in 2014.     

第十二届深水操作会议和展览会(英文)

正November 4-6,2014Moody Gardens HotelConvention Center/Galveston,TX The Deepwater Operations Conference and Exhibition is celebrating its 12th anniversary this year.This growing event will continue the tradition of excellence in addressing operational challenges involved in developing deepwater resources.We will return to the Moody Gardens Hotel and Convention Center on November 5-7,2014 in Galveston,Texas.     

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）.     

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.