93285部队结合实际情况举办车辆驾驶员集训班

为认真贯彻落实上级开展的“军车交通安全月”活动，切实做好预防车辆交通事故工作，杜绝车辆事故的发生，93285部队不久前开展了“使命在我脑中、法规在我心中、安全在我手中”活动，以提高驾驶员的安全行车意识。先后举办了高、中、初级驾驶员集训班，分层次、分级别地对驾驶员进行安全行车和装备日常维护、保养教育。通过此次集训学习，进一步加强了驾驶员安全行车意识、     

节能轴支架的作用原理设计方法和叶剖面优化

介绍了节能轴支架的作用机理、设计方法和叶剖面的优化。节能轴支架的作用机理与桨前固定导轮相似 ,但设计要比桨前固定导轮简化 ,并要兼顾轴支架自身的作用和要求。文中详细给出了轴支架的布置形式和在船模试验中获得的显著节能效果。试验结果证明把轴支架的两支臂设计成有约 1 0°的收缩角可增大节能轴支架的预旋作用 ,从而增大节能效果 ,使轴支架的节能效果达约 1 2 %。空泡试验和激振力测量结果表明 ,把Eppler的翼型势流设计方法设计翼型与解 N-S方程进行流场分析相结合 ,用层流型高升阻比翼型优化节能轴支架是成功的 ,能有效地降低轴支架的阻力和推迟空泡初生 ,从而有利于节能轴支架在高速船上推广应用。实船安装证明本文的设计方法是成功的     

江南造船厂50至70年代焊接技术发展回顾和经验

本文回顾江南造船厂50年代至70年代期间推广应用机械化焊接的历程和成就，并指出船舶产品设计和制造工艺上的改进是开辟当前推广高效焊接和提高经济效益的一项重要措施，还提出了一些进一步推广应用高效焊接和机械化焊接的建议。     

三种高分子电解膜燃料电池

前两期我们介绍了氢气/空气电解膜燃料电池.在实际应用中,还有几种其它类型的高分子电解膜燃料电池,虽然它们在发展程度和简化程度上都远不能与氢气/空气燃料电池同日而语,但我们仍然希望通过对以下三种高分子电解膜燃料电池的介绍,使读者能够全面了解高分子电解膜燃料电池技术的发展情况.     

南京一公司作业线承包改革显示多方位活力

<正>南京港一公司是一家有着近千名职工,从事钢材、黄砂、煤炭和白云石等件杂货装卸经营的老企业。多年来,由于企业退休职工多,包袱沉重,一直是局内的政策性亏损单拉。进入1994年,国家宏观调控强劲,水运市场竞争更为剧烈,这家公司的经营形势依然严峻。4月1日,这家公司宣布:以现有的装卸队为主体,以作业线为单位,按货种分类组建成四个装卸分公司。实行从设备设施,经营管理到经济效益目标的全方位承包。新组建的装卸分公司,凡经营所必须的固定资产和有关工作人员基本配属齐全;凡经营所必须的自主权尽可能赋予到位,使其基本具备了面向市场,相对自主经营和自主实现各项经营目标的能力。     

断高法在高等级公路测设中的应用

通过在高速公路和黄河二桥的测量工作中出现的水准测量问题,介绍用断高法解决问题的方法.     

Delay Restoration of Single-Track Railway Rescheduling

On the basis of analysis of the principle of delay restoration in a disturbed schedule, a heuristic algorithm for rescheduling trains is developed by restoring the total delay of the disturbed schedule. A discrete event topologic model is derived from the original undisturbed train diagram and a back propagation analysis method is used to label the maximum buffer time of each point in the model. In order to analyze the principle of delay restoration, the concept of critical delay is developed from the labeled maximum buffer time. The critical delay is the critical point of successful delay restoration. All the disturbed trains are classified into the strong-delayed trains and the weak-delayed trains by the criterion of the critical delay. Only the latter, in which actual delay is less than its critical delay, can be adjusted to a normal running state during time horizon considered. The heuristic algorithm is used to restore all the disturbed trains according to their critical details. The cores of the algorithm are the iterative repair technique and two repair methods for the two kinds of trains. The algorithm searches iteratively the space of possible conflicts caused by disturbed trains using an earfiest-delay-first heuristics and always attempts to repair the earliest constraint violation. The algorithm adjusts the weak-delayed trains directly back to the normal running state using the buffer time of the original train diagram. For the strong-delayed trains,the algorithm uses an utility function with some weighted attributes to determine the dynamic priority of the trains, and resolves the conflict according to the calculated dynamic priority. In the end, the experimental results show that the algorithm produces ＂good enough＂ schedules effectively and efficiently in disturbed situations.