用分治及贪婪策略实现FFT整序

FFT整序的关键是逆序号的求取,用预先存贮的逆序表可提高FFT整序的效率.算法结合分治与贪婪策略,用最少的交换次数得到逆序表.算法避免了常规整序中顺序号与逆序号的比较运算, 提高了FFT整序的效率.为了比较相关算法在Windows操作系统下的运行效率,编制了相应的C 　 程序.实验表明,求取长2N的逆序表时,算法的交换次数为数组长的一半(2N-1-1或2N-1-2),其效率优于传统的整序算法.     

船用离心泵可靠性强化试验方案

针对船用离心泵可靠性试验需时过长,被试件多,难以满足工程实际需要的问题,本文提出船用离心泵可靠性强化试验与序贯寿命抽样试验相结合的试验方法。在对船用离心泵失效机理分析的基础上,拟定棕刚玉砂为强化因子对其进行可靠性强化试验;同时提出可靠性验证试验采用截尾序贯试验方案进行,并给出此方法的理论依据、失效判据,绘制了判决图表。     

基于位序-规模法则的区域港口群发展演化规律

为合理利用港口资源、减少恶意竞争,提出基于位序-规模法则的港口群发展演化规律研究方法。以吞吐量为衡量港口规模的指标,以变异系数、基尼系数等指数研究区域港口群规模差异,以首位度指数判断区域港口群是否服从位序-规模分布,进而基于位序-规模理论研究区域港口群规模分布,定量分析区域港口群发展演化规律。实例分析以欧盟港口群为研究对象,结果表明:欧盟港口群规模差异较大,不均衡程度会逐年增大;欧盟港口群符合位序-规模法则,随着港口位序由高到低,吞吐量增长率会随之减小。     

基于首位度和位序-规模法则的长三角港口群发展演化分析

为了深入剖析长三角港口群的等级规模分布及演化规律，以货物吞吐量和集装箱吞吐量为衡量港口规模的指标，运用港口首位度和位序-规模法则对长三角地区港口规模分布进行研究。结果表明：长三角地区港口间差距不断缩小，港口等级规模分布由首位分布向位序-规模分布演变；江苏省港口等级规模结构比较松散，高位序港口集聚效应不明显，浙江省港口吞吐量分布则过于集中；长三角港口群规模分布总体上呈分散化发展趋势，未来需要加快推动内河港等小型港口的发展，进一步优化港口体系结构；长三角港口群的货物运输已形成比较稳定且分散的系统，而新兴集装箱港口不断涌现，集装箱运输发展迅速，其等级体系仍在不断变化，长三角集装箱港口的规模分布集聚程度更高。     

用特征向量估计方案权与方案下标序的关系

本文讨论了层次分析法中用特征向量估计方案权与方案下标序的关系。指出特征向量法的解相对于方案下标序来说是不变的，而梯度特征向量法的解依赖于方案的下标序。同时，证明了当方案个数为3时，梯度特征向量法的解的几何平均就等于特征向量法的解。     

基于多属性综合评价法的港口节能减排水平评价*

客观综合地对港口节能减排水平进行分析和评价是实现港口节能减排的必要条件,针对港口节能减排水平评价指标之间的排序优势性,以及评价指标的多样性等特点,采用指标序优势多属性综合评价法,利用指标排序确定各权重系数,并对5大港口进行了实证分析评价,评价的结论基本符合港口节能减排水平的现状,该方法具有可操作性和实用性。     

半序F-型拓扑空间中算子方程的多解性

文中在引入φ辅物序的F-型拓扑空间中,利用其已给出的相关半序性质,考虑更一般的情形,在N不要求具有序连续性时采用序方法,研究了一类非线性算子方程Lx=Nx在满足H条件下的可解性,并给出这类算子方程具有多解性的条件.     

味精废水处理工艺研究

首先分析、列出味精废水的主要成分,简述国内外处理这类废水的方法和技术。作者重点介绍其对高浓度味精废水和低浓度的味精厂混合排放污水处理所作的研究和试验：对高浓度味精废水采用混凝法,对低浓度的混合污水采用ＳＢＲ法（序批法）。试验结果表明,排放水水质达到国家规定的标准,本项研究试验成果可应用到工程实际中去。     

直序扩频技术在港口无线网络中的应用

介绍了无线网络的关键技术——无线直序扩频技术，简要地记述了厦门东渡港在实施无线网络的项目中对该技术的成功应用。     

勾股模糊近似空间的层次结构刻画

粒计算理论是智能数据处理领域中的新的计算范式,是研究多层次粒结构的思维方式,是复杂问题求解和信息处理模式的方法论.勾股模糊集作为粒计算理论的一个重要模型,对其层次结构的研究有助于丰富粒计算理论的研究成果.讨论勾股模糊集的信息粒化,给出了信息粒化基数的表示方式,研究了勾股模糊信息粒化的性质,并提出了3种序关系表示勾股模糊...     

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。