军用危险品航空运输适运性分析

军用危险品种类繁多,理化性质复杂,在实施航空军运时,必须严密组织,周密论证。通过对民航货机装运军用危险品影响因素的分析,确定了适于航空运输的军用危险品种类及范围的筛选条件。从军用危险品理化性质的角度探讨其适运性,并初步确定在基本可运条件(舱门尺寸,货仓限重、限高等)的基础上冲击感度不超过48%的军用爆炸品适于航空运输,可为军用危险品航空运输工作提供参考。

基于改进灰色关联度的弹药航空适运性评价指标体系构建

针对弹药航空运输适运性评价的问题,首先分析弹药航空运输的特点和航空适运性影响因素,建立初始评价指标体系;然后,采用改进灰色关联度模型对弹药航空适运性初始评价指标体系进行优化,经过灰色关联分析,剔除与适运性评价目标关联不强的指标,采用德尔菲法对指标优劣排序进行调整,并利用相关性分析法去掉相关性较强的指标。得到优化的弹药航空适运性评价指标体系,兼顾了指标的主观性和客观性。最后,通过实例验证了模型的有效性和实用性。

基于熵-G1法的枪弹类军用危险品包装航空适运性灰色评估

针对枪弹类军用危险品包装航空适运性不清楚的问题,基于熵-G1法对枪弹类军用危险品包装进行航空适运性评估。首先,根据枪弹类军用危险品包装航空适运性影响因素构建出评估指标体系;其次,针对评估指标的不确定性,基于灰色关联决策理论,建立枪弹类军用危险品包装航空适运性的灰色评估模型,为使权重更加合理,采用熵权法和G1法结合的方法确定评估指标的权重;最后,进行实例验证。验证结果表明:该评估模型具有可行性和有效性,能够解决枪弹类军用危险品包装航空适运性问题,为部队开展枪弹类军用危险品包装的航空适运性评估提供了模型借鉴。

高速铁路军事运输适运性研究

针对我国高速铁路迅猛发展的有利形势,为高速铁路建设贯彻国防要求提供指导,促进高速铁路军事运输潜力向部队战略投送能力的转化,介绍了我国高速铁路的发展现状,分析了高速铁路军事运输潜力,提出结合军事运输需求、利用高速铁路进行军事运输的几个时机。

枪弹类军用危险品包装航空适运性试验与评估

针对枪弹类军用危险品包装航空适运性的评估问题,借鉴国际民航的成熟经验,提出了试验与评估的新方法。构建了评估指标体系,并将需要由试验评估的指标筛选出来。设计出评估方案,由于评估试验是在小子样的基础之上,提出了基于云模型的定性试验数据定量化的方法和基于小子样快速收敛点估计法的试验数据处理方法。实例证明,所提方法能够结合部队实际情况,有效地反映了枪弹类军用危险品包装航空适运性的真实情况。

基于对象—环节—要素—指标的高速铁路军事力量适运性方法研究

为给高速铁路开展军事运输提供理论支持,针对高速铁路军事力量适运性问题,通过分析高速铁路军事运用的潜在优势与实际不足,系统梳理高速铁路军事运输各环节及运输要素能力指标,构建基于运输对象—环节—要素—指标的高速铁路军事运输适运性评价模型,并运用该模型对高速铁路军事适运性进行分析,提出高速铁路军事适运对象和限制性因素。

军事装备航空适运性研究

在民用货机选型的基础上,分析了货机装载影响因素,提出了装备航空适运判定准则,并结合实例进行了判定,同时分析了改善装备航空适运性的技术途径。研究内容对提高装备航空运输计划的科学性、合理性具有一定价值。

海运铝土矿安全适运性思考

0引言 2015年1月2日,载有46 400 t铝土矿的散货船＂Bulk Jupiter＂轮从马来西亚航行至中国途经越南南海岸时发生沉船事故,19名船员全部落水,其中3名船员遇难,16名船员失踪。该事故引发国际社会的高度关注,铝土矿的安全运输问题成为航运界和学术界讨论的焦点。铝土矿是工业炼铝的主要原料,

论武器装备运输性

简要介绍了美国确保武器装备运输性的做法，分析了我军武器装备在运输性上存在的问题及原因，建议对我军武器装备的运输性开展全面系统的研究。

红土镍矿粉海上运输事故致因分析及对策

镍是我国稀缺的一种有色金属原料,是生产不锈钢不可或缺的重要元素,且在机械制造等领域有广泛用途。随着国内不锈钢生产的快速发展,镍的需求趋于旺盛,尽管我国是全球镍冶炼产品生产大国,但国内镍矿矿床储量、产量仅占国内需求的10%,与我国相关工业、产业的迅猛发展极不适应。

Motion connectivity-based initial video object extraction

In order to obtain the initial video objects from the video sequences, an improved initial video object extraction algorithm based on motion connectivity is proposed. Moving objects in video sequences are highly connected and structured, which makes motion connectivity an advanced feature for segmentation. Accordingly, after sharp noise elimination, the cumulated difference image, which exhibits the coherent motion of the moving object, is adaptively thresholded. Then the maximal connected region is labeled, post-processed and output as the final segmenting mask. Hence the initial video object is effectively extracted. Comparative experimental results show that the proposed algorithm extracts the initial video object automatically, promptly and properly, thereby achieving satisfactory subjective and objective performance.

Design of unballasted track bridges on Beijing——Tianjin intercity railway

Beijing-Tianjin intercity railway is the first newly-built passenger dedicated line with operating speed of 350 km/h in our country. During design,new ideas of bridge construction were carried out to ensure the requirements of safety,comfort and stability of the train under high-speed condition. At the same time,concepts of environmental adaptability,service to transportation and comprehensive benefits were observed. On the whole line,long-bridge schemes were adopted and the most advanced technologies of unballasted track were utilized on bridges,the length of which accounts for 87.7 % of the total line. The success of design and construction of the bridges on this rail has accumulated valuable experience for high-speed railway construction on a large scale in the future,and made it a marking,demonstrating,and model project to follow.

Analysis of the applicability of collision probability algorithms for nonlinear relative motion

In the calculation of the collision probability between space objects, the assumption of linear relative motion is generally adopted to simplify the problem because most encounters are at high relative velocity. Nevertheless, the assumption is no longer valid for encounters at extremely low velocities, and a new algorithm is urgently needed for computing collision probability for space objects having nonlinear relative motion. In this particular case, the direction associated with relative velocity is reintroduced for integration. The different integral limits would lead to the variations of probability and integral time. Moreover, the application scope of this new algorithm is also presented. Since the nonlinear effect is only significant in some certain situations, the new algorithm needs to be considered only in such certain situations. More specifically, when space objects in circular orbits encounter with a tiny inclined angle (the extreme situation), the new algorithm can derive much more accurate collision probability than the linear method, that is to say, the linearity assumption involved in general collision probability formulation is not adequate anymore. In addition, the deviation of the probability derived by the linear method (linear collision probability) from that derived by the nonlinear method (nonlinear collision probability) also weakly depends on the relative distance and combined covariance, and essentially depends on their ratio.

Global Well-Posedness of the BCL System with Viscosity

The BCL system, a kind of equations governing the motion of the free surface of water waves in R3, is studied. Some results on the global existence, uniqueness and regularity of solutions to such system with small initial data are obtained.