应加强土工新材料使用管理、总结提高

随着科学进步的日新月异,各种新的土工材料在不断出现.设计部门也都在有关的设计中积极地推广和使用.尤其是土工网、格室、格栅、固土网垫等在铁路路基防护中已被较广泛的采用.然而,就个人所见,这些新材料在个别地段使用还没有达到预期的效果,因此,呼吁有关部门予以重视,尽快予以改进和完善.     

调度监督维护系统设计问题的研究

针对铁道部调度监督系统(DMIS)中维护子系统设计模式问题,综合运用路由器技术,网络技术,数据库技术,提出相应的设计思想、实现方法及其安全防护措施,并有效地运用于具体实践中.     

带式输送机包胶滚筒磨损原因分析与改进措施

带式输送机原来使用的包胶滚筒容易磨损,物料撒落被带入回程带是造成磨损加剧的重要原因,针对性地采取改用高效清扫器和聚氨酯包胶、加强管理等措施后,明显改善了包胶更换频繁影响生产的问题.     

A multi‐class mean‐excess traffic equilibrium model with elastic demand

Recent empirical studies have revealed that travel time variability plays an important role in travelers' route choice decisions. To simultaneously account for both reliability and unreliability aspects of travel time variability, the concept of mean‐excess travel time (METT) was recently proposed as a new risk‐averse route choice criterion. In this paper, we extend the mean‐excess traffic equilibrium model to include heterogeneous risk‐aversion attitudes and elastic demand. Specifically, this model explicitly considers (1) multiple user classes with different risk‐aversions toward travel time variability when making route choice decisions under uncertainty and (2) the elasticity of travel demand as a function of METT when making travel choice decisions under uncertainty. This model is thus capable of modeling travelers' heterogeneous risk‐averse behaviors with both travel choice and route choice considerations. The proposed model is formulated as a variational inequality problem and solved via a route‐based algorithm using the modified alternating direction method. Numerical analyses are also provided to illustrate the features of the proposed model and the applicability of the solution algorithm. Copyright © 2012 John Wiley & Sons, Ltd.     

高桩码头系缆墩和钢联桥一体化结构创新设计

针对由装卸平台、系缆墩、钢联桥组成的一字形布置高桩墩式码头,常规的设计思路考虑三者独立受力,弱化各结构之间的传力效应。从三者协同受力的角度出发,提出一种适应于特定布置形式的系缆墩和钢联桥一体化结构设计方案,结合工程案例介绍该结构的形式和受力分析方法,并从受力和造价方面与传统的高桩墩台方案进行比较。结果表明：在满足使用功能的前提下,一体化方案有利于发挥结构的整体受力优势,减少系缆墩和钢联桥的工程量,降低工程造价。     

公路隧道照明眩光影响仿真与分析

通过综合模拟仿真与定量分析,研究公路隧道照明眩光的影响范围,对加强公路隧道行车安全、提高公路隧道照明舒适度具有现实意义。文章通过引入眩光常数G和相对阈值增量TI的计算方法,并针对隧道对称布灯、交错布灯以及中央布灯三种情况下的隧道照明眩光进行了仿真分析,得出了三种布设方法下产生的眩光影响范围。研究结果表明:对称布灯时眩光影响范围为75.73°;中央布灯时眩光影响范围为76.22°;交错布灯时眩光影响范围为79.58°。通过计算分析眩光常数G得出结论:在隧道照明中无论是用哪种照明布灯方式,一旦发生眩光影响,它的影响等级都是比较高的。在这种影响情况下,驾驶员驾驶车辆在隧道中行驶所受到的危害程度会相对较大。     

应用于小型发动机市场的怠速空气控制阀

面对发展中国家越来越严峻的空气污染状况,正在积极制定、颁布更加严厉的小型发动机排放法规和标准。目前,怠速空气控制阀（IACV）与电子燃油喷射（EFI）组合已被广泛应用于大型发动机汽车市场的尾气排放中,这种组合同样也被认为是有助于降低小型发动机尾气排放的最有效的解决方案。     

The determinants of maritime policy

The paper is to explore the relation between national economic development and the formulation of maritime policy. It collects and examines data from 30 maritime nations, and shows that maritime policy is determined by economic circumstance rather than the result of rational decision of policy makers. A general solution is produced for an optimum maritime policy under a given economic condition. The general solution can serve as a benchmark for future maritime policy making and research in general.     

Evaluating competitiveness using fuzzy analytic hierarchy process—A case study of Chinese airlines

With the development of a national market economy, the Chinese aviation industry is now confronted with international competition. Therefore, it is necessary to research the competitive status of Chinese national aviation, as well as advice on how to enhance the competitiveness of the Chinese aviation industry. The main objective of this paper is to propose FAHP as an effective solution for resolving the uncertainty and imprecision in the evaluation of airlines' competitiveness. In this paper, we review the research of industrial international aviation competitiveness at both home and abroad, discuss a theoretical framework for the study of aviation competitiveness, establish an index system with five first‐order indicators and 17 second‐order indicators, set up a Chinese aviation competitiveness model based on simple fuzzy numbers from the fuzzy analytic hierarchy process, and evaluate the competitiveness of five major Chinese airlines. The results showed that this model and these indicators are scientific and practical, with a wide range of application prospects for the purpose of improving and increasing Chinese airline competitiveness in the international market. The effective approach presented in this paper is especially applicable when subjective judgments on performance ratings and attribute weights are not accessible or reliable, or when suitable decision makers are not available. Copyright © 2011 John Wiley & Sons, Ltd.     

郁江大桥航道试爆振动测试初步分析

为防止爆破地震动导致桥梁结构的损坏,需要对航道爆破区地震动效应进行研究,确定爆破安全距离及安全装药量。文章通过对郁江大桥试爆结果进行分析,为本工程及类似工程进入施工阶段时的爆破设计提供参考数据。