船舶涂装检验——检验业务的新这点

船级社参加船舶涂装检验的必要性 船舶航行于江河湖海之上,环境对船体结构材料的侵蚀是不可避免的.给船体构件涂上一层防腐涂层,是控制和减少结构材料腐蚀程度的最经济有效的手段之一.涂层能提高船体结构的防腐能力,对保证船体结构的安全有着重要的意义.90年代以来,随着IMO和IACS对此问题的重视,ESP、CAS等一系列规定先后出台,指导验船师和船东对船体的外板、甲板、货舱和压载舱的涂层状况进行检验和评估.各船级社在海洋工程方面都已将对结构涂层的检验要求纳入了船级条件,尽管对船舶涂装检验的要求还未被强制规定为入级条件,但也纷纷组织人力进行研究,DNV船级社还制订、颁布了对新造船涂层配套和涂装施工质量控制的指南.总的发展趋势是船级社将会更加广泛地介入船舶涂装领域.     

An overview of buckling and ultimate strength of spherical pressure hull under external pressure

The load-carrying capability of spherical shells under external pressure has been the subject of a long history and many theoretical and experimental studies have been carried out. However, from a comparative study on the design rules for the minimum thickness of the deep manned spherical shells from various classification societies, significant differences have been found. This indicates that these design rules need to be updated and unified like Common Structural Rules for tankers and bulk carriers. In order to lay a foundation for this target, a systematic study is carried out to develop a consistent calculation method for predicting the ultimate strength of spherical pressure hull under external pressure. This is the first paper of a series of three for reporting this study and in this paper, a critical review on the buckling and ultimate strength of spherical pressure hulls is carried out and further problems to be studied are identified. This could lay a solid foundation for the further study.     

某型登陆艇机舱综合监测报警系统的设计

为提高登陆艇机舱自动化程度,采用机舱综合报警系统对机舱重要设备及液舱等进行实时监控报警,并在驾驶室通过延伸触摸屏进行实时监测,达到无人机舱的标准。     

TP64GK型棚车70t级升级设计

简要介绍了TP64GK型棚车及其存在的问题,提出了将其性能由60t级升级到70t级的升级设计方案、运用中存在问题的解决措施及相关计算分析。     

地铁通信电源系统的安全控制

从保障地铁通信电源设备安全运行方面出发,针对电源设备可能出现的故障,采用设备安全控制的理念,分析交流配电屏的安全切换,UPS、高频开关电源、蓄电池的安全控制点,以及安全控制对外界环境的要求等,从而实现对通信电源系统故障进行预防和快速有效处理的目标。     

信号系统电子安全设备自检技术研究

就信号系统安全平台系统中的运算处理板展开自检技术研究分析,提出了可行方案。采用对运算处理板关键安全功能部件进行了上电自检(IBIT)和在线自检(CBIT)来确保该部件的可靠性。该项技术可推广至其他电子安全系统中去。     

CIPS环境下的综合回放

从编组站作业环节出发,结合中国铁路编组站各业务流程,提出了一个新的回放系统设计理念。作为CIPS系统的一部分,面对复杂的作业流程,如何通过回放系统完整地再现编组站作业的全过程,是CIPS综合回放系统研究的主要内容。论文结合CIPS系统在成都北编组站、武汉北编组站及贵阳南编组站的实际应用,详细阐述了回放系统需要面对的业务需求及其相应的数据表达方式,同时对系统的实现方法进行了探讨,并在文章的最后部分,对CIPS综合回放系统在编组站的应用进行了总结。     

经皮穿刺冠状动脉腔内成形术68例分析

我院近年共完成经文穿刺冠状动脉腔内成形术（PTCA）68例，其中单支病变37例（54．4％），双支病变22例（32．4％），三支病变9例（13．2％）。PTCA共扩张79处病变，A型病变39处（49．4％），B型病变30处（37．9％），C型病变10处（12．7％）。3例采用邓导丝技术，5例采用灌注球囊导管，8例放置冠状动脉内支架，三例进行了冠状动脉内膜斑块定向切除术。PTCA的病倒成功率97.1％，病变成功率93．5％，本前平均狭窄（878±8．4）％，术后平均狭窄（14．1±46）％。1例死亡，无息性心肌梗塞和急诊冠状动脉搭桥者。讨论了PTCA的适应症、影响成功的因素以及并发症的预防，表明PTCA是冠心病的有效治疗手段。     

维拉帕米与ATP终止室上性心动过速的临床电生理对比观察

用维拉帕米和ＡＴＰ终止２４例室上性心动过速，比较两药的有效性、电生理效应和副作用。结果显示：虽然两药主要作用于房室结，但两药复律方式、电生理效应有差异；终止室上性心动过速两药疗效相似（Ｐ＞０．０５），ＡＴＰ复律快（Ｐ＜０．０５）而维拉帕米复律过程平稳且复律后心律失常发生率低（Ｐ＜０．０５）。     

Heuristics for the identical machine scheduling problem with preventive maintenances

In this paper, two mixed integer programming models integrating production scheduling and preventive maintenances are proposed to derive the optimal solutions for the identical machine scheduling problem with unavailability constraints. In the first model, the maintenance activities are performed periodically and the objective is to minimize the makespan. In the second model, the maintenance activities are flexible and the machines’ continuous working time cannot exceed a maximum allowed time T; the objective is to minimize the total completion time of jobs. For the first problem, we propose a heuristic longest batch time (LBT) and prove that the worst case error bound of LBT is 2. For the second problem, we develop a heuristic modified smallest processing time (MSPT) based on some properties of the optimal solutions. Computational experiments show that both of the heuristics are effective and efficient compared with the results obtained by CPLEX and the other algorithms.