丹麦城市桥梁建设一瞥

该文系统地介绍了前几年笔者考察北欧国家——丹麦期间,对哥本哈根、马尔默、斯卡恩等城市桥梁建设的总体印象和分类考察的情况、相关启示和建议,为国内同行们提供有借鉴意义的资料和启示,以期促进我国城市桥梁建设的健康发展。     

心绞痛病史对心肌梗塞患者临床及预后的影响

对有和无心绞痛病史的的１３５例急性心肌梗塞患者的临床资料进行了对比分析。结果表明：无心绞痛病史组与有心绞痛组比较，心梗多发生于前壁（Ｐ＜０．０５），且前者合并糖尿病者较多（Ｐ＜０．０５）；两组患者ＣＰＫ峰值、ＬＶＥＦ值、早期并发症及再梗率、住院死亡率无明显差异。提示无心绞痛病史的心肌梗塞与有心绞痛者具有相似的病理生理及临床预后。     

阴道彩色多普勒对异常早孕妇女血流动力学的研究

应用经阴道彩色多普勒法对105例正常早孕，65例异常早孕妇女的子宫血流进行观察，并测定各组子宫动脉、螺旋动脉PS、RI、PI值。结果说明：经阴道彩色多普勒是评估早孕血流动力学改变的首选方法；对异常早孕的诊断和鉴别诊断有重要的临床价值。     

工程项目中施工索赔的技巧

索赔是工程项目合同管理的重要组成部分。此根据工程项目索赔的成功经验，分析论述了做好索赔工作应注意掌握的7个方面的技巧。     

辽宁交通数据交换平台建设

数据交换是系统之间、部门之间进行数据共享的重要手段之一。本文针对辽宁交通数据交换平台建设，介绍了数据交换的原理，数据中心架构和具体功能，以及建设过程中应该注意的事项。     

Exchange of carbon by an upwelling filament off Cape Ghir (NW Africa)

We have studied the physicochemical and biological structure of a permanent filament off Cape Ghir (31°N) and estimated the transport of organic matter associated with it. The seaward filament exported coastal upwelled water, with low temperature and salinity and high organic matter, to the open ocean even in the absence of upwelling-favorable conditions. The estimated flux of excess organic carbon (the nonrefractory pool) expressed in annual basis yielded a value of 3.1×10⁹ kg C, from which 90% was transported as dissolved organic carbon. This flux represents about 63% of the average annual primary production for the region of study. We conclude that the net-offshore transport may contribute to the enrichment of offshore oligotrophic waters throughout the year, partly explaining the metabolic imbalance found in open ocean waters of the subtropical Northeast Atlantic.     

Influence of Governance Context on the Management Performance of Marine Protected Area Networks

In the Philippines, networks of marine protected areas (MPAs) are more complex than individual MPAs, primarily due to involvement of multiple governance units. Hence, there is a need to understand the influence of governance context of networks on management performance. We addressed this need indirectly by evaluating the participation of network members and the governance capacity of three MPA networks with varying sizes, histories, and compositions of local governments and constituencies. We defined participation as the involvement of local governments and other stakeholders in decision-making processes. We defined governance capacity as the ability to govern interactions of social, economic, and political processes and dynamics in a political unit. We used qualitative, semi-structured key informant interviews and focus group discussions to ascertain whether participation and governance capacity are influenced by network size, institutional arrangements, and social and political contexts. We found that the sizes of the MPA networks did not affect participation and governance capacity. Instead, participation and capacity were influenced by institutional arrangements and the socioeconomic and political contexts of the local governments involved. We found that less complicated network objectives and systems for engagement, more inclusive membership, better communication, incentive systems, and strong leadership enhanced participation and governance capacity.     

舰船岸电接地问题分析

舰船停靠码头一般需要接用岸电系统。本文根据对舰队码头现有的岸电系统实地调研的结果,对岸电与船电在不同的接地形式下所构成的TT系统和TN-C系统进行了分析比较,认为TN-C系统优于TT系统,同时,针对现有船舶岸电系统配置现状,提出了电缆配置改造方案和舰船岸电箱优化方案,并对码头岸电建设和舰船岸电系统设计提出了建议。     

11～12 m长客车离合器操纵系统设计

介绍大客车离合器操纵系统结构、评价指标及设计方法。     

基于电化学模型的PEM燃料电池建模与仿真

基于PEM燃料电池的电化学模型.运用Matlab的Simulink仿真工具对系统进行建模及稳态、动态仿真分析.稳态分析主要研究了温度对电池电压和输出功率的影响;动态特性分析当电池电流突增和突降时,电池电压、输出功率、消耗功率、电池效率、电池等效内阻的动态响应.此模型也可用于电堆的仿真与设计,为燃料电池的优化与控制提供帮助.