邮政运输车辆管理系统及其实现技术

文章利用设备综合工程学的原理,并结合邮运生产的实际情况,介绍了基于Ｃ／Ｓ结构的邮政运输车辆调度及管理系统的开发方法与技术。探讨了运输企业技术管理中的几个重点和难点,并结合企业实际提出了有效的解决方法,对运输企业和车辆的现代化管理作出了有益的尝试。     

稠油化学降粘技术研究进展

综述了稠油开采、集输和管道输送中使用的化学降粘剂（主要是油溶性聚合物降粘剂）及化学降粘技术。这是国内外研究、开发均很少的一个领域。全文除前言外包括以下四大论题。①油溶性降粘剂降粘技术：原理,降粘剂结构特点及国内油田应用于稠油井采油的一个实例。②油溶性降粘剂：发展简史,结构类型（主要为共聚物降粘剂）及国内外现场应用的11种商品降粘剂（10种用于长距离管输,1种用于稠油井生产）。③在我国油田的应用问题：集输,水乳化降粘（使用水溶性乳化剂）,作为辅助手段的油溶性降粘剂,稠油改质降粘。④研究中存在的问题与方向：油溶性降粘剂的作用机理及合成中的新思路,适当结构的降粘剂与表面活性剂的复配,化学降粘的局限性。参考文献63条。     

AAL层抗信元丢失技术

ＡＴＭ网络中传输视频信号存在的信元丢失会严重影响接收图象的质量，可以从视频编解码端与ＡＴＭ适配层采取抗信元丢失技术以减少该影响。不同ＡＡＬ有不同的抗信元丢失原理。本文分别对用ＡＡＬ１，ＡＡＬ２，ＡＡＬ５适配ＭＰＥＧ－２视频信号时在ＡＡＬ层采取的抗信元丢失技术进行了分析。     

城市群快速轨道客运系统建设策略分析

城市群空间的形成要求借助于区域或城市间的完善的交通网络体系,许多城市群建立以大容量的快速轨道客运系统为骨干,地面辅以常规多类型公共交通网络为补充的多层次、多元化、立体化的客运交通方式相互协调的综合客运交通体系,并以此城市群综合客运交通体系为城市交通发展的基本战略。本文在此主要研究我国城市群快速轨道交通规划中的建设策略。     

Impact of battery weight and charging patterns on the economic and environmental benefits of plug-in hybrid vehicles

Plug-in hybrid electric vehicle (PHEV) technology is receiving attention as an approach to reducing US dependency on foreign oil and greenhouse gas (GHG) emissions from the transportation sector. PHEVs require large batteries for energy storage, which affect vehicle cost, weight, and performance. We construct PHEV simulation models to account for the effects of additional batteries on fuel consumption, cost, and GHG emissions over a range of charging frequencies (distance traveled between charges). We find that when charged frequently, every 20 miles or less, using average US electricity, small-capacity PHEVs are less expensive and release fewer GHGs than hybrid electric vehicles (HEVs) or conventional vehicles. For moderate charging intervals of 20–100 miles, PHEVs release fewer GHGs, but HEVs have lower lifetime costs. High fuel prices, low-cost batteries, or high carbon taxes combined with low-carbon electricity generation would make small-capacity PHEVs cost competitive for a wide range of drivers. In contrast, increased battery specific energy or carbon taxes without decarbonization of the electricity grid would have limited impact. Large-capacity PHEVs sized for 40 or more miles of electric-only travel do not offer the lowest lifetime cost in any scenario, although they could minimize GHG emissions for some drivers and provide potential to shift air pollutant emissions away from population centers. The tradeoffs identified in this analysis can provide a space for vehicle manufacturers, policymakers, and the public to identify optimal decisions for PHEV design, policy and use. Given the alignment of economic, environmental, and national security objectives, policies aimed at putting PHEVs on the road will likely be most effective if they focus on adoption of small-capacity PHEVs by urban drivers who can charge frequently.     

煤柱(Coal Log)在水力输送管道内的流动性状

煤柱水力输送管道（CoalLogPipeline）是目前正在美国进行研究和开发的一种最新型的管道输煤技术．本文就这种管道输煤技术的水力学原理，即压制成圆柱形的煤柱在管道中的流动性状进行分析讨论．这些流动性状包括管道煤柱流的区域划分，煤柱的起动速度和悬浮机理，以及沿管道的压力损失．通过分析导出的有关的水力学计算公式简单易行，可为煤柱水力输送管道的设计提供基本的设计参数．     

面向城市道路交通状态估计的数据融合研究

实时道路交通状态估计是ATMS和ATIS的重要内容。布设于城市道路网络中的各类检测器提供了丰富实时的动态信息。针对目前我国各检测器间相互独立形成信息孤岛、数据参数多样、结构迥异、采样周期和精度不一等现状,采用贝叶斯估计、模糊逻辑等数据融合方法建立多源异构交通信息三层次融合体系,得到精度更高、可靠性更强的交通信息。实例证明,数据融合适用于城市道路交通状态估计。     

视频分析技术的研究和应用

通过对视频分析关键技术的探讨及国内外研究小组科研成果的分析.揭示了视频编码技术、视频对象分割技术、基于内容检索技术、流媒体传输技术之间的内在联系以及各自的技术要点、难点.通过介绍视频分析技术在视频监控中的应用,展望了该技术在多个领域的广阔的应用前景.     

一种快速车牌定位算法

提出一种快速的车辆牌照定位算法,对获取的车辆图像进行相应预处理后,根据图像的纹理特征,分析牌照区域字符分布情况及变化规律,利用车牌号码区域像素值的变化频率,在一个特定范围内进行水平和垂直方向上的定位,从而准确地得到车牌区域。实验结果表明,本文提出的算法能够较好地快速定位车辆图像中车牌区域。     

The engineering rheology of liquid explosives as highly concentrated emulsions

Rheological properties of liquid explosives are summarized and discussed in this paper. Liquid explosives are highly concentrated emulsions by their physical nature. During the internal phase, it is an aqueous supersaturated solution of mainly ammonium nitrate which is a useful component of a multi-component system, and at the continuous phase it is a solution of emulsifier in hydrocarbon oils. Liquid explosives demonstrate a complex set of properties characteristic for highly concentrated emulsions, such as visco-plasticity, existence of the yield stress, thixotropy (or time-dependent behavior), non-Newtonian flow at stresses exceeding the yield stress. Rheological properties depend on the concentration of internal phase, size of droplets, and the nature of the used surfactant. Stability of these materials is determined mainly by the tendency of an aqueous solution to crystallization at prolonged storage, though shearing does not influence on phase separation. Wall slip is absent in flow of liquid emulsions through tubes. Therefore, it allows us to make reliable predictions on the output vs. pressure dependence for real technological practice.