曹妃甸LNG码头建设规模与通航效率的适应性

曹妃甸LNG接收站作为我国北方天然气供应的重要保障主体,冬季高峰期月到港LNG船舶达到8～11艘,按照规划扩建后将成为国内外规模最大的LNG接收站。由于LNG船舶通航的严格监管,到港船舶数量的增加会对航道通航效率造成显著压力,因此需要论证码头建设规模与航道的适应性。在现状定线制通航条件下,基于多智能体仿真建模方法,构建曹妃甸港区LNG船舶进出港全过程仿真模型,定量评估不同LNG码头建设规模对LNG船舶通航效率的影响。结果表明,当LNG泊位数达到4个时,船舶进出港受制约明显,优化航路后能有效提高LNG船舶的通航效率。     

效率评定在客车标准作业时间制定中的应用

介绍效率评定的概念,阐述效率评定在客车标准作业时间制定实践中的应用。     

舰载多功能相控阵雷达效能评估

针对舰载多功能相控阵雷达的系统特性,根据其具备的警戒、引导、跟踪、目标识别与指示、火控与制导等功能,建立了海基多功能相控阵雷达作战效能评估指标体系,对其效能进行评估。在简单介绍了灰色层次分析法和其基本算法步骤的基础上,利用改进型灰色聚类分析和层次分析法来评估舰载多功能相控阵雷达作战效能的模型,把该雷达系统中的一些定性分析转化为定量分析。再结合实例,通过具体评估,验证了评估模型及算法的有效性,为海基多功能相控阵雷达的作战效能评估提供了依据。     

中远集运能效管理信息系统与碳排放计算器

文中介绍了中远集运能效管理信息系统与碳排放计算器的开发背景、系统架构、系统使用开发技术、EEOI计算依据与碳排放计算器的功能与应用。     

18单元线极化径向线阵列天线优化及实验研究

为了改善18单元线极化径向线阵列天线的辐射性能,通过改变子阵馈电网络封口形状并优化馈电探针、改进单元天线和适当减小阵列天线单元间距3种方法,对阵列天线进行优化,对反射特性和辐射特性进行理论分析、数值仿真和实验研究.仿真结果表明:中心频率1.57 GHz上的反射系数为0.067,增益为18.73 dBi,轴比为-39.82 dB;在1.43～1.76 GHz范围内,反射系数小于0.15.实验结果表明:中心频率1.57 GHz上的驻波比为1.19(对应的反射系数为0.087),增益为17.65 dBi,轴比为-39.2 dB;在1.47～1.77 GHz范围内驻波比小于1.4(对应的反射系数为0.17).仿真结果与实验结果相符.     

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公路运输效率高低是衡量公路运输发展水平的重要依据.随着可持续发展战略的实施,经济增长方式由粗放型向集约型转变,必然要求公路运输提高生产效率,优化发展模式.本文从投入和产出两个层面建立公路运输效率评价指标体系,基于DEA方法构建了综合评价模型,定量测算公路运输综合效率、技术效率和规模效率,并采用31省份的投入产出截面数据进行实证分析.结果显示：半数省份DEA有效,公路运输综合效率存在较明显的地域差异;2/3的省份达到规模效益递减或不变,增加要素投入对提高综合效率不具积极性;资源投入过度、要素使用效率低下是导致运输效率不高的主要因素.最后针对公路运输发展中存在的主要问题提出相应的发展模式.     

The development of the TIGRIS XL model: A bottom-up approach to transport, land-use and the economy

The project appraisal method in the Netherlands distinguishes direct effects, indirect distribution effects and indirect generative effects. Transport models are generally available for calculating the benefits of transport projects to travellers as part of the direct effects. The TIGRIS XL model, a Land-Use and Transport Interaction model, adds indirect distribution effects for the housing and labour market, by modelling changes in the spatial distribution of jobs and residents. This paper describes the current TIGRIS XL model and how it can be applied in the evaluation of transport projects. It refers to work done with the TIGRIS XL model to improve the calculation of the direct benefits by applying the so-called ‘logsum’ method. Finally it discusses ideas on how to extend the TIGRIS XL model to address indirect generative effects as well.The current TIGRIS XL model, its integration with the National Model System (the standard tool for the Dutch government to analyse the effects on passenger transport) and basic design principles are the starting point of such an exploration. These design principles include:

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an emphasis on detail, both spatial as well as in socio-economic segments, to account for differences in the availability of choice alternatives and in choice behaviour, and to provide impacts by region and socio-economic group;

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the requirement that the relationships used rest on an empirical foundation.

The post-processing methods proposed on this paper for the calculation of the direct benefits and indirect generative effects are consistent with these design principles. To calculate the indirect generative effects, a post-processing module is proposed which transforms changes in travel times and land-use into agglomeration effects. These agglomeration effects combine several of the generative effects, like scale economies, an increasing variety of products, labour market matches and knowledge spill-over. The effects of changes in the agglomeration indicator on productivity can be estimated with existing data sources, as was demonstrated in the UK (Graham, 2005).     

基于DFMA理念的船体结构设计

分析了面向制造和装配的设计思路,结合多个详细设计和生产设计案例的分析,强调了在船舶设计领域推行DFMA的重要性。     

浅谈外海大潮差地区水下大型软体排铺设工艺的改进

以南通洋口港区人工岛围堤工程为例,介绍水下大型软体排的组成结构、材料选取和设计方法的要点,并重点探讨如何改进在复杂工况条件下铺设水下大型软体排的施工工艺和船机配备.实践证明,改进后的软体排铺设工艺与传统施工工艺相比,既提高了施工效率,又确保了工程质量.