Importance of ocean circulation in ecological modeling: An example from the North Sea

There is an increasing number of ecological models for the North Sea around. Skogen and Moll (2000) [Skogen, M.D., Moll, A. 2000. Interannual variability of the North Sea primary production: comparison from two model studies. Continental Shelf Research 20 (2), 129–151] compared the interannual variability of the North Sea primary production using two state-of-the-art ecological models, NORWECOM and ECOHAM1. Their conclusion was that the two models agreed on an annual mean primary production, its variability and the timing and size of the peak production. On the other hand, there was a low (even negative dependent of area) correlation in the production in different years between the two models.In the present work, these conclusions are brought further. To try to better understand the observed differences between the two models, the two ecological models are run in an identical physical setting. With such a set-up also the interannual variability between the two models is in agreement, and it is concluded that the single most important factor for a reliable modeling of phytoplankton and nutrient distributions and transports within the North Sea is a proper physical model.     

一种客车车顶型支架的制作工艺

简要介绍一种用于客车车顶的异型支架,并对支架结构、制作工艺和制作过程进行分析和设计。     

82000 DWT散货船舾装生产设计问题的剖析

针对几家船厂82 000 DWT散货船舾装生产设计中出现的问题,分析产生问题的原因,提出解决问题的方法。减少舾装件材料规格,提高分段舾装件预装率,优化制作和安装工艺。比较不同设计单位之间的设计方法,磨合出图模式和出图标准。创造输入条件,提前建模,尽早暴露出专业之间的碰撞和布置等问题。这为后续同类型船提供了设计和建造经验。     

Hydrography and biogeochemistry of the north western Bay of Bengal and the north eastern Arabian Sea during winter monsoon

The north eastern Arabian Sea and the north western Bay of Bengal within the Indian exclusive economic zone were explored for their environmental characteristics during the winter monsoons of 2000 and 2001 respectively. The two regions were found to respond paradoxically to comparable intensities of the atmospheric forcing. There is an asymmetry in the net heat exchange of these two basins with atmosphere because of the varying thickness of barrier layer. During winter, the convective mixing in the Arabian Sea is driven by net heat loss from the ocean, whereas the Bay of Bengal does not contribute to such large heat loss to the atmosphere. It appears that the subduction of high saline Arabian Sea water mass is the mechanism behind the formation of a barrier layer in the northeast Arabian Sea; whereas that in the Bay of Bengal and the southeast Arabian Sea are already established as due to low saline water mass. The weak barrier layer in the Arabian Sea yields to the predominance of convective mixing to bring in nitrate-rich waters from the deeper layers to the surface, thereby supporting enhanced biological production. On the other hand, the river discharge into the Bay of Bengal during this period results in the formation of a thick and stable barrier layer, which insulates vertical mixing and provide oligotrophic condition in the Bay.     

兰州铁路局货运生产布局优化探析

分析了铁路局直管站段体制下,兰州铁路局货运生产布局的现状及存在的问题,提出了货运集中化、整合货运营业站货运业务和零担货物运输整合的措施,并对优化布局的有利性进行了探析。     

水下生产系统数据库研究

随着海洋石油工业技术的发展和海上油田水深的增加，水下生产系统已越来越受到世界各国的重视，并已被纳入世界各大石油公司的重要发展战略。在国内，水下生产系统的研制和开发尚仍属起步阶段，急需系统、全面的数据资料供相关人员查阅。为此，水下生产系统数据库首次被提出并实现。本数据库通过搜集汇总采油树、水下工艺设施、水下接头、控制系统、常用材料、工程公司、项目案例等7个方面的国内外最新相关数据资料，同时进行合理的编排、分类以及整理，最终以网页形式浏览查询。该数据库包含有水下生产系统的构成、各部分的技术要点、主要供应商、设计服务以及建造安装服务的专业公司、成功应用的案例以及成本预算等信息，为相关人员进行水下项目的可行性分析以及技术决策提供了全面、系统的数据支持。     

氢燃料电池汽车不同制氢方案的全生命周期评价及情景模拟研究（双语出版）

氢燃料电池汽车作为新能源汽车领域未来的重要方向已成为行业共识，为评估氢燃料电池汽车不同制氢方案对资源、能源和环境的影响，构建氢燃料电池汽车燃料循环以及4种制氢方案的全生命周期评价数学模型，选取代表世界先进水平的丰田Mirai燃料电池汽车作为评价对象，应用GaBi软件的基础数据库对其进行全生命周期评价，同时对甲烷催化重整法、甲醇催化裂解法、电解水法和氨裂解法4种制氢方案的全生命周期能耗、排放进行量化计算。最后，以电力结构作为关键因素对当前最常用的电解水法进行情景模拟并与其他3种方案进行对比分析。评价计算结果表明：电解水法制氢的矿产资源消耗、化石能源消耗和环境影响均最高；甲醇催化裂解法制氢的矿产资源消耗和化石能源消耗均为最低，仅分别为电解水法的2%和3%；甲烷催化重整法制氢的环境影响最低，仅为电解水法的1.6%。情景模拟结果表明：电解水法的环境影响在煤电比例降低到41.6%的情况下仍然在4种制氢方案中最大，然而在水力单一清洁能源发电的极限情况下环境影响最小，但基于中国的资源禀赋，全面实现水力发电并不可行。因此，须从提升电解水法的能源利用效率、改进关键技术等方面有所突破才能使其成为未来大规模制氢的可行方案。     

CRTSⅡ型轨道板生产线方案研究与分析

基于高速铁路无砟轨道结构中的CRTSⅡ型轨道板生产线方案进行可行性分析，研究了CRTSⅡ型轨道板生产线的几种方案，并从技术、生产、经济等方面对几种方案进行了对比，为CRTSⅡ型轨道板场生产线的方案选择提供参考依据。     

基于贝叶斯网络的港口生产安全评价方法

将基于贝叶斯网络的概率安全评价方法引入港口生产作业安全评价中,提出了将故障树分析法转换为贝叶斯网络的步骤,建立了基于贝叶斯网络的安全评价模型。通过在贝叶斯网络模型上进行推理求解,进行前向的风险预测和后向的诊断分析。最后通过对码头前沿机损的安全评价实例说明该评价方法的合理性和有效性。     

OSHMS与《安全生产法》

《职业安全健康管理体系审核规范》的颁布与实施为推进我国职业安全健康管理工作向科学化、规范化方向发展奠定了基础。而《中华人民共和国安全生产法》则是企业建立和开展OSHMS(职业安全健康管理体系 )的法律保障。开展OSHMS工作与贯彻《安全生产法》是相得益彰的