装备维修保障资源优化配置的遗传算法

装备维修保障资源的合理配置，是装备保障的重要内容之一。提出一个基于遗传算法的资源优化配置算法模型，给出了模型求解的有效算法。最后，给出具体的计算实例，以验证优化配置方法及算法的有效性。     

铁路工程局的经营战略研究

本文通过对一铁路工程局经营现状的调研分析，提出该工程局的经营战略，并对该战略进行了可行性论证，提出实现该战略应采取的相应措施。     

A review of the effect of a／W ratio on fracture toughness （Ⅰ）—experimental investigation in EPFM

Many experimental investigations have previously been performed and recently done on different shipbuilding structural steels where the specimens size and crack depth/specimen width (a/W) were varied. A series of interesting results have been gained. It is worthwhile to have a review on the effect of a/W ratio on fracture toughness, and further theoretical analysis is necessary. In this paper, experimental work in elasticplastic fracture mechanics (EPFM) was discussed. Tests had been carried out on 10 kinds of strength steels. Results showed that J _i and δ₁ values increased with decreasing a/W when a/W<0.3 for three-point bend specimens and that shallow crack specimens which have less constrained flow field give markedly higher values of toughness than deeply notched specimens. However, for a/W>0.3, the toughness was found to be independent of a/W. Slip line field analysis shows that for shallow cracks, the hydrostatic stress is lower than that from standard deeply cracked bend specimen which develops a high level of crack tip constraint, provides a lower bound estimate of toughness, and will ensure an unduly conservative approach when applied to structure defects especially if initiation values of COD/J-integral are used.     

Determinants of crew injuries in vessel accidents

This study investigates determinants of the number of non-fatal crew injuries, fatal crew injuries and missing crew in freight ship, tanker and tugboat vessel accidents based upon individual accidents investigated by the US Coast Guard for the 1991-2001 period. Poisson and negative binomial regression estimates suggest that: (1) freight ship and tanker non-fatal injuries are higher when the vessel is moored or docked and during high winds and cold temperatures; (2) tugboat non-fatal injuries are higher during poor visibility; (3) freight ship fatal injuries increase with vessel age and tanker and tugboat fatal injuries are higher for fire and capsize accidents, respectively; and (4) freight ship missing crew increase with vessel age and tugboat missing crew are higher for fire and lake accidents.     

《工程估价》课程整合与创新——信息化电算化在《工程估价》的应用

《工程估价》课程教学改革是一项教学实践的创新活动。本文从工程估价课程整合的角度,就如何有效利用现有教学资源,结合学科热点,提出了自己的方案,同时对课程整合的教改实践进行了分析和探讨。     

淬火钢轨应力研究

沈阳局淬火线从最初建立喷雾淬火到最后改造为喷风淬火,期间由于淬火轨应力不均匀而造成施工中的种种困难,文章介绍为解决施工难题而采取的各种措施和试验方法。     

体外预应力加固框架梁的试验与研究

通过对混凝土框架梁进行体外预应力加固试验,研究并分析了体外预应力加固混凝土框架梁在不同转向块布置的情况下对考虑二次效应影响下短期挠度的发展及影响因素。     

铁路水处理技术现状及发展动向研究

作者结合长期从事铁路给排水研究的经验，在大量现场调研的基础上，详细分析总结了目前我国铁路给排水中存在的有关供水节能、供水水质、污水处理方面的主要技术问题。并结合国内目前水处理技术发展水平，提出了解决这些问题的切合实际的方法，对铁路水处理技术的发展具有一定的指导意义。     

Prediction of Stabilization of Ship in Random Wave

In this paper we show thc method of energy in part with which we can get the model of random wave,and predict theroll motion of unstabilized ship and stabilized ship using the wave model.The control parameters of fin stabilizer are determinedaccording to the performance index. The simulation of the system is also made in this paper. The comparison of the simulationwith real ship indicates that the method can be used in the prediction of roll motion of a stabilized ship in random wave.     

时速300km铁路客运专线长钢轨焊接施工方案

针对时速300km铁路客运专线无缝线路的特点及长钢轨焊接要求,对无缝线路长钢轨焊接施工方案进行了初步研究,提出了各种条件下(单元轨基地、铺设现场)钢轨焊接方式的优选方案。