“南海挑战号”半潜平台改造方案研究

随着开发形势的发展，流花油田“南海挑战号”半潜平台现有的4台发电机越来越不满足电力供应要求，因而必须增加新的发电机。但由于增加电机及相应辅机、结构等较重，超过规范要求。“南海挑战号”必须停产做倾斜试验，这会对业主造成很大的经济损失。针对电站扩容项目，通过数值计算方法精确得到平台改造后的重量重心，平台完整稳性和破舱稳性均满足船级社规范中关于稳性的要求，避免了停产做倾斜试验等问题。     

论编制既有电气化增建二线铁路定额的必要性

随着我国电气化铁路的发展,在既有电气化铁路的基础上,增建二线电气化铁路的项目愈来愈多,而现行定额尚属空白.此文对该类项目的施工组织、方法、工艺、行车干扰以及人工和机械的消耗等方面的特殊之处,进行了具体分析,并提出了定额编制的建议.     

浅析船舶压载水的污染及对策

船舶压载水是造成不同水域间有害生物和病原体传播的主要途径之一,其生态污染性日益得到人们的重视,本文将分析船舶压载水的污染问题和对我国的影响,以及目前一些主要杂货出口国管理和控制压载水污染的措施,并针对我国压载水污染的状况提出一些切实可行的建议,以期达到有效遏制压载水污染,切实保护海洋环境的目的。     

灾害性海浪危害及分布

灾害性海浪的定义及分类灾害性海浪通常是指海上波高达6米及以上的海浪。因为波高等于或大于6米的海浪对航行在世界大洋的大多数船只已构成威胁,它能掀翻船只,摧毁海上工程和海岸工程,给航海、海上施工、海上军事活动、渔业捕捞等带来极大的危害。     

小型分体绞吸式挖泥船设计

不同的施工环境和工况,需要不同的配套设备,本文就是针对特殊的施工工作环境,通过合理选型、配套、优化设计的一种中小型绞吸式挖泥船。     

合资铁路通信维护工作的思考

合资铁路公司的通信是指挥列车运行，组织铁路运输生产，提高效率，保证安全，传输各种信息及公务联络的重要设施，也是铁路通信网的组成部分，具有全程全网、统一指挥、分级管理的维护管理要求。如何加快合资铁路公司通信的发展，做到通信联络迅速、正确、保密、稳定，为实现铁路现代化提供通信保障，笔者对合资铁路公司通信维护工作进行了思考。     

船舶操纵模拟器训练特点及应用

论述了船舶操纵模拟器训练特点,并介绍了应用体会,以提高船舶操纵模拟器训练教学质量。     

Quantitative estimation of the influence of surface thermal fronts over chlorophyll concentration at the Patagonian shelf

Eighteen-year (1985–2002) mean monthly SST Pathfinder data with 9 km spatial resolution have been used to estimate surface gradients by finite differences. Then the seasonal climatological means have been calculated from the intensity of these gradients, and surface thermal fronts present in the Patagonian Continental Shelf (PCS) have been located. Moreover, 6 years (1998–2003) of SeaWiFS data with approximately 4 km spatial resolution have been used to estimate monthly composite images of surface chlorophyll concentration, after which seasonal climatological means distributions have been generated. Both seasonal distributions have been analyzed together and by combining the knowledge of oceanographic processes and phytoplankton responses to light and nutrient availability, regions where the presence of a thermal front affects photosynthetic activity have been identified. Subjective criteria have been applied to define eighteen areas where phytoplankton biomass is influenced by the presence of a thermal front. In these areas, the surface chlorophyll (spatial mean and total), its relationship with the surface chlorophyll of the whole region, and the seasonal evolution of this relationship have been calculated. All frontal areas cover less than 15% of the total surface, but they contribute with over 23% of the phytoplankton annual mean biomass. Considered as a group, during summer they show high chlorophyll values very similar to those in spring. During the cold period, when the water column is vertically mixed in practically the whole of PCS, the influence of physical fronts over the biological production is minimum. The frontal zone image remains clearly defined during summer, when approximately 85% of the area will have a determined mean chlorophyll concentration, while the other 15% has a 2.45 times larger value. While three pattern trends have been identified in the frontal areas, only two of them condition the pattern of the group, due to their horizontal extension.     

基于GPRS的振弦式传感器测频系统

针对传统桥粱振动频率测量系统存在数据采集实时性差的缺点，提出基于GPRS无线网络的数据采集方法。以Atmega128单片机为现场数据采集端的MCU，并以MC35为GPRS Modem来实现与互联网接入，将GPRS无线技术引入桥梁安全检测测频系统，非常适用于要求实时性的、大数据量传送的远程数据监控系统应用场合。     

西藏怒江大桥岸坡变形及破坏模式的相似模型试验研究

根据西藏怒江大桥的地质情况,采用模型相似原理,建立其岸坡的结构相似模型。通过模型试验分析在桥基荷载作用下岸坡的变形及破坏模式,并分析在设计荷载作用下岸坡的变形特征及稳定性。