船舶与海洋工程结构物舱室间隔声测量与评价

详细阐述了船舶与海洋工程结构物舱室间空气声隔声的测量与评价问题,并结合SEVAN300型浮式海上生产储油平台典型舱室间隔声测量,对混响时间、舱室间隔声量的测量等进行细致描述;结合ISO相关内容就评价过程中的单值评价量、粉红噪声修正和交通噪声修正等进行说明,为船舶与海洋工程结构物舱室间空气声隔声的测量和评价提供参考。     

水泥砂浆地面起砂的预防与处理措施

由于使用材质、施工操作、养护等问题,造成水泥砂浆地面起砂现象时有发生,给工程质量造成了一定的影响。分析一些仓库和仓房工程的起砂原因。提出预防起砂的措施。最后介绍若干起砂的治理方法。     

舰船辐射噪声总声级及总能量的统计分析

在相同工况下,对于某一舰船辐射噪声总声级和总能量的多次测量结果来说,总声级的直方图分布比较对称,而总能量的直方图分布不对称.本文假设该舰船辐射噪声总声级多次测量值满足正态分布,利用非参数假设检验中的皮尔逊x2拟合检验和柯尔莫哥洛夫检验分别对其进行验证分析.结果表明,在显著性水平α较小时,总声级近似服从正态分布,进而得出总能量服从对数正态分布.结论在一定程度上给出了该舰船辐射噪声总声级及总能量的取值范围.     

LNG燃料动力船机舱设计研究

以本质安全型机舱、紧急防护型机舱为基础,提出了增强安全型机舱的设计思路,通过增强通风、加强探测与报警、采用全熔透对焊接头等措施降低机舱风险.以某内河LNG燃料动力船为目标,进行了增强安全型机舱的设计,给出了气体燃料管路上安装相应阀件、机舱和阀箱内设置气体探测和机械通风、供气管路的连接采用全熔透对焊接头、发动机进排气总管和曲轴箱上安装防爆安全阀、驱动风机的电动机安装在通风管道外、管道及电器设备接地等设计要求,达到了本质安全型机舱的风险水平.     

Local Level Fisheries Management in Diani-Chale,Kenya: Current Status and Future Directions

The current regime of fisheries management and the prospects for attaining a more locally oriented, collaborative system of fisheries management in Diani-Chale, Kenya are examined. At present fisheries management in Diani-Chale is characterized by diminished government capacity for regulation, weakened local institutions, and little ability to exert control over the use of fisheries. Local level management requires the development and use of local institutions that can govern the use of fishery resources. The fish landing sites used by fishers and their associated fishing grounds were identified to be at the appropriate level for resolving fishery management issues. A more formal role for these entities, the clarification of fishing ground tenure and access rights, and support for the development and enforcement of local fishing rules can further local management. The socioeconomic condition of fishers, their fear of losing landing sites, and the continued perception of the imposition of a marine reserve pose barriers to initiatives seeking to further local level management.     

松花江大顶子山航电枢纽坝下冲刷深度及水位降落研究

利用长河段一维数学模型,预报了大顶子山航电枢纽在运行不同时期后的冲刷深度及水位降落情况。结合近坝段河床防护措施,确定了大顶子山枢纽下游最低通航流量、相应的下游最低通航水位、枢纽船闸的门槛最小水深以及船闸下闸首底槛的高程。     

基于改进层次分析模型的舰载无人机系统修理级别分析研究

在对原有舰载无人机系统评价指标体系进行组合优化以简化修理级别分析流程的基础上,从利用三标度法简化判断矩阵的构建和采用最优传递矩阵性质避免一致性检验两个层面对层次分析模型进行了改进,并基于这一改进模型对舰载无人机系统的修理级别分析模型进行了研究。算例表明该改进模型计算过程简单、结果可靠。     

非天然水深大型开敞式码头靠泊时机与乘潮水位的确定

通常乘潮水位的确定,对于码头前沿天然水深满足船舶满载吃水要求的码头是适用的,但对于大型船舶停靠水域属非天然水深大型开敞式码头则不适用。提出以适宜船舶靠离的潮流条件确定船舶靠离泊时机,以此靠泊时机为先决条件,进而确定港池水域、航道设计中所选取的乘潮水位值,并结合工程实例进行了计算、比较。该方法运用于非天然水深大型开敞式码头效果良好。     

Port authorities view state coastal management programs

Abstract

An estuarine sanctuary is a store of public values due to the ecological, cultural, recreational, aesthetic, historic, and economic services provided by the preserve. These values may be expected to increase over time because of (1) growth in the population demanding estuarine services, (2) growth in the willingness to pay for such services, and (3) growth in the actual quality and quantity of services which are provided by a protected natural system. Thus an estuarine sanctuary will be more valuable to future generations than to current generations. When weighing the cost and benefits of a preservation or development decision, a preservation decision which seems currently undesirable may in fact be socially beneficial when growth in the value of estuarine services is included.     

某舰用锅炉防腐治理研究

某舰用锅炉管束腐蚀是影响蒸汽动力舰艇正常使用的重要因素,文章通过对管束腐蚀原因的分析,提出对锅炉采用防潮保温技术可以有效缓解锅炉管束的腐蚀状况。根据该思路,通过对中修舰艇锅炉现状的研究,提出对锅炉烟囱盖进行密封性改装即可达到锅炉防腐目的。通过对舰艇的实际改装,验证了该技术的应用价值,并在同类舰艇中推广该技术。