我国船舶大功率柴油机现状与发展趋势

分析对比了国内外船舶大功率柴油机的现状、技术发展趋势及存在的差距,提出了我国发展船舶大功率柴油机的思路和建议。     

谈谈目前船员状况与现代船员培养

本文分析了我国目前船员队伍处于当今世界船员劳务市场中的地位及状况，提出成为国际性船员存在的差距及应在船员培训和航海高等院校培养中及早注意的几个问题。     

环网配电及所用负荷开关的技术发展

分析了环网柜及负荷开关的国内情况，并与国际先进产品作了横向比较，指出尚存在的差距和发展趋势，提出了改进方案。     

环网配电及所用负荷开关的技术发展

分析了环网柜及负荷开关的国内情况,并与国际先进产品作了横向比较,指出尚存在的差距和发展趋势,提出了改进方案。     

中国如何应对IMO成员国自愿审核过渡期

介绍IMO成员国自愿审核机制的来由及中国的开展情况，分析中国作为IMO成员国之一在自愿审核机制应对中存在的主要差距，并提出相应对策。     

青岛港与广州港、深圳港之对标研究

<正>青岛港在北方港口群中的优势地位较为显著,对标粤港澳大湾区港口群中两大最重要的港口——深圳港、广州港,对比分析深圳港、广州港的发展特色及经验,厘清青岛港发展存在的差距及优势,对于下一步制定青岛市港航业发展思路及重点任务具有重要意义     

成熟国际航运中心的经验对建设天津北方国际航运中心的启示

目前天津北方国际航运中心的硬件建设已经基本达到了国际航运中心的要求,但是与世界上老牌的成熟的航运中心相比较,还是存在一定的差距,本文介绍了伦敦、鹿特丹、新加坡这三个有代表性的航运中心的特点,并分析天津北方国际航运中心存在的差距,提出在推进建设北方国际航运中心过程中的一些注意事项。     

宁波港向“第四代港口”跨越式发展的战略思考

阐述了第四代港口的内涵.针对宁波港面临的机遇和挑战,分析了其向第四代港口跨越式发展的条件;并从集装箱运力、基础设施、服务功能、海陆一体化、经济腹地等5方面论述了其存在差距及努力方向.     

认清形势,选择切入点 提升我国造船工业的水平

本文分析了世界造船业的发展现状和形势,指出了我国船舶工业与世界造船强国相比存在的差距,并分析了存在差距的主要原因,给出了我国船舶工业的发展策略。建议我国政府借鉴日本、韩国等国家的成功经验给予造船业更多的扶持,同时,我国造船业应注意选择发展的方向和重点,采用先进造船技术,转变造船模式。     

国外深水港施工技术简介及与我国目前的差距

重点介绍国外深水码头施工技术现状、筑港材料局长情况以及我国目前存在的主要差距。     

水下耐压壳体结构可靠性的设计方法

在水下耐压壳体的环肋圆柱壳结构设计中,为了保证结构的强度和稳定性,几何参数的确定必须要满足规范所要求的五个约束条件.完工后的几何尺度与设计几何尺度存在着一定的误差,可将这些误差分布密度函数认为服从正态分布,利用其约束条件结合可靠性理论建立环肋圆柱壳耐压壳体可靠性分析方法,以实际测量中统计得到的数据为已知条件给出了可靠度计算方法.     

A global view on port state control: econometric analysis of the differences across port state control regimes

This article is based on 183 819 port state control inspections from various port state control regimes for the time frame 1999 to 2004. Using binary logistic regression, we establish the differences of port state control inspections across several regimes, even though theory predicts there should be no significant differences in treatments of vessels. The results indicate that the differences towards the probability of detention are merely reflected by the differences in port states and the treatment of deficiencies and not necessarily by age, size, flag, class or owner as perceived by the industry and regulators. The analysis further shows that some differences can be found across ship types and regimes and that there appears to be room for further harmonization in the area of port state control.     

A global view on port state control: econometric analysis of the differences across port state control regimes

This article is based on 183 819 port state control inspections from various port state control regimes for the time frame 1999 to 2004. Using binary logistic regression, we establish the differences of port state control inspections across several regimes, even though theory predicts there should be no significant differences in treatments of vessels. The results indicate that the differences towards the probability of detention are merely reflected by the differences in port states and the treatment of deficiencies and not necessarily by age, size, flag, class or owner as perceived by the industry and regulators. The analysis further shows that some differences can be found across ship types and regimes and that there appears to be room for further harmonization in the area of port state control.     

Population dynamics of the red shrimp Aristeus antennatus in the Balearic Islands (western Mediterranean): Short spatio-temporal differences and influence of environmental factors

The red shrimp Aristeus antennatus is one of the target species of the bottom trawl fishery of the Balearic Islands. The objective of the present paper is to study the short spatial and temporal differences of this important economic resource between two different locations off Mallorca (Cabrera: CA; Sóller: SO), where a fleet mobility pattern has been detected, and to study the influence of environmental conditions on this species. Six simultaneous bottom-trawl and oceanographic surveys were carried out at these two locations in order to collect data from the demersal species, hydrography (temperature and salinity), trophic resources and sediment characteristics. The commercial fleet from both locations was monitored by monthly on-board sampling, log-books and daily landings obtained from sales slips. Additional data was obtained from other fishing surveys. Short spatial and temporal differences have been detected between both locations. The population at CA was more demographically homogeneous, while that at SO showed important variations, like high abundance of juveniles recruiting to fishing grounds in autumn–winter and high abundance of large females during summer. Several differences have also been found in the biology of the species between locations, such as males were more abundant in SO than in CA. Also, the reproductive period started sooner in SO than in CA, and the condition of pre-spawning females was better in SO. The percentage of total lipids in the hepatopancreas was minimal during the spawning period, showing their importance as a reserve of energy for the ovary ripening. Water masses could play an important role in these differences, the characteristics of water masses being more stable in CA than in SO. Red shrimp adult females seemed to be more correlated with the warmer and more saline Levantine Intermediate Waters, while juveniles (males and females) and adult males were more correlated with the colder Western Mediterranean Deep Waters, detected only in SO during autumn–winter. Two different hypothesis of mobility patterns for the species are discussed in relation to these observed differences.     

国际货运公约对多式联运规范之差异

《国际多式联运公约》近期内生效的可能性十分渺茫,因而,调整多式联运下众多关系人之间的法律关系在事实上存在着难以弥补的差异。文章指出了各公约中关于多式联运规定所存在的差异,并提出了法律适用方面的建议。     

西方港口民营化经验对我国的启示

在世界港口业发生变革的进程中,港口民营化在港口经营管理中是至关重要的一环,对港口今后的发展有着深远的影响。分析了西方国家和中国港口民营化现状,对几种港口民营化情况做了研究和比较,最终阐述了西方港口民营化经验对我国的启示。     

光电设备中功率器件的散热优化设计

采用传统的热设计理论及经验公式对功率器件进行了散热设计,并校核了散热器的性能指标,同时介绍了散热器的散热原理;提出散热器优化问题,讨论了散热器的理论优化和工程优化的不同,以及在工程实际情况下功率器件如何与散热器达到最优匹配,并对散热器进行了优化设计。     

离心泵设计的相似换算和面积比法

依据涡壳式离心泵面积比法的设计计算原理,对采用相似换算法设计计算而得的某型船用卧式离心泵系列产品的实尺参数和试验数据进行对照分析,借以了解两种设计计算方法的异同并作为新产品设计的参考.     

大侧斜桨敞水性能及流场数值研究

针对库存大侧斜桨,基于商用RANS代码,利用结构化网格技术和流道计算模型开展了大侧斜桨敞水水动力和流场的数值分析.在进速系数J ε[0.33,0.95]范围内,文中计算得到的敞水螺旋桨水动力与试验结果差异在3%以内.通过敞水螺旋桨流场计算和计及粘性影响鼓动盘计算结果比较可知,螺旋桨对桨前流场影响主要是抽吸作用;对桨后近场区域XIDP<4流场影响主要是滑流,轴向速度周向均值沿径向分布主要受桨叶负荷分布控制;到中问区域415,螺旋桨尾流变成了单一的剪切流.     

考虑流场影响下破冰船艏部结构响应研究

通常考虑船-冰碰撞附连水的水动力效应有附加质量法和流固耦合法。本文建立了破冰船破冰场景,基于流固耦合法进行了数值仿真计算,分析了水域流场对船体的冲击压力变化、流场的速度分布变化以及流场的动能变化。同时与附加质量法的计算结果进行了比较,对比分析了船艏的碰撞力大小、损伤变形以及局部冰载荷等差异,揭示了流场对船-冰碰撞的影响规律,对于破冰船结构设计具有重要的参考价值。