微带阵列天线的设计与FDTD分析

论文设计出工作频率在1．79GHz的矩形微带天线,利用FDTD进行建模和仿真,分析了该微带天线的频率特性和远场辐射方向图。以这个微带天线为单元,设计出了两种采用不同馈电方法的直线阵列天线,分别计算了它们的远场辐射方向图,讨论了阵列天线单元间互耦的影响,并得出了结论。     

一种小型化微带天线的分析与设计

文章设计了一种圆极化微带天线,同时给出了一些设计的结构及性能参数。该天线具有外型小、结构紧凑,便于加工。     

多层水平全向振子阵的辐射特性研究

根据短波传输的特点设计并研究了一种水平极化的全向振子阵。基于矩量法对其进行了仿真和计算，得出水平面和垂直面的辐射方向图，并进行了详细的分析和比较，给出了利用矩量法求解天线问题的一般思路。结果表明：此类振子阵具有水平面的全向性和垂直面的强方向性。在实际使用中可根据不同要求对天线进行选型。     

磁性天线数字化全向图合成方案设计*

为了解决磁天线接收信号存在盲区的问题,提出一种可以用希尔伯特滤波器来完成的宽带甚低频水下通信全向接收新方法,完成数字化全向接收的理论推导。在未知信号载波频率的条件下,可实现对信号进行宽带移向,从而完成磁性天线数字化全向合成。仿真结果表明,设计方案合理可行,可用于宽频带信号全向天线的数字化合成。     

耦合微波介质同轴谐振器的带通滤波器设计

由1／4波长介质同轴谐振器作为分布参数元件，用集总参数的贴片电容耦合，构成带通滤波器。根据所设计的滤波器技术指标，确定滤波器的类型，级数，结构。然后将其中的并联谐振结构替换为采用高介电常数的介质同轴谐振器。通过仿真验证，最后制作出符合要求的带通滤波器。     

ETC系统OBU上5．8GHz圆极化天线小型化研究

一种新型的不停车收费系统（ETC）车载单元（OBU）的小型圆极化微带天线在文中提出，工作频段为5．8GHz。该天线结构简单，采用高介电常数的底板使天线实现小型化，同时获得了3．4dB左右的增益、H面全向以及右旋圆极化特性，轴比最小仅为0．2dB左右。采用微带馈电方式，使它能容易地与ETC系统车载单元中的其他射频电路连接。     

调零天线阵列设计研究

介绍了一种我国卫星定位系统抗干扰接收机射频前端的调零天线阵列。基于功率倒置（PI）算法和天线原理,设计出的天线阵列实现了自适应调零天线各项指标。重点介绍了调零原理、天线阵列设计和对天线单位阵元的设计与仿真,同时介绍了微带天线的基本理论和圆极化天线的科学测试方法,便于准确实现天线的指标和各单元的一致性情况。该调零阵列天线对卫星导航信息信号稳定性有特殊要求和电磁环境恶劣的场合有重要作用。     

一种短波相控阵天线设计研究

基于短波同相水平天线,设计出一种短波相控平面阵列天线。该天线阵为矩形栅格平面阵天线,采用4(4个半波振子作为辐射单元。通过改变天线阵馈电网络移相量,改变天线阵波束指向,构成一种方位波束可控的相控平面阵天线。对该相控平面阵天线进行了深入的数学分析,求解辐射单元最佳激励。计算仿真结果表明,该相控天线具有较好的阻抗特性及辐射特性,满足给定方向上的短波通信要求,具有较高的应用价值。     

舰船天线辐射仿真计算研究

预设计是实现舰船总体电磁兼容性先进的设计方法,而天线辐射效能的仿真计算是预设计手段之一。针对舰船天线布置及设计需求,提出一种天线的建模方法,并根据该方法进行天线辐射效能的仿真计算。首先运用FEKO软件对舰船的一种组合天线进行三维空间参数建模和电激励参数建模,然后根据舰船不同的工作状态进行仿真计算,预测该工作状态下天线的辐射效能,最后对仿真计算结果进行对比分析。为舰船天线设计提供定性的建议和定量的数据,为舰船天线优化布置提供了参考依据。     

分形微带带通滤波器的研究和设计

目前，微波滤波器的小型化已成为一个热门的研究领域，在小型化基础上提高性能是滤波器研究的主要内容。因此，发展高性能，研究小型化的微波滤波器是当前十分热门的课题。在传统和其他结构的微带带通滤波器的基础上，结合分形概念，提出新型结构的傲带带通滤波器。该结构很好解决传统滤波器的辐射损耗和体积大等问题。文中利用上述研究，在滤波器原型基础上，设计并仿真一次分形和二次分形的滤波器结构，结果满足设计要求。     

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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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.     

某海港码头的撞损修复

依据码头撞击受损区域调查检测结果,对受损构件提出合理的修复方案,为码头的安全运行提供保障。