基于云存储的铁路综合视频监控系统方案研究

在铁路综合视频监控系统相关标准规范的基础上,重点就云存储方案设计原则、云存储方案架构、云数据中心等多个方面进行阐述,提出基于云存储的铁路综合视频监控系统建设方案与建议.     

静电场第四类边值问题的改进算法

本文提出了静电场第四类边值问题的若问题的一种改进算法,直接形成每个导体电位的离散化代数方程,占用计算机内存量有较大减少。在多导体第四类边界节点多的情况下,优越性尤为显著。通过数值计算实例对算法进行比较,验证了本算法的有效性。      

城镇平急两用雨水调蓄设施规划设计要点研究

由于全球气候变化,近年来各地极端天气频发,严重影响城市生产生活,提升城市韧性成为全国各大城市面临的紧迫议题。结合平急两用理念,对地上的广场、绿地、高架,地下的车库、隧道,以及湖泊等多种应急雨水调蓄设施开展形式研究,提出应用场景、实施要点和运维建议,以期为保障城市安全、减轻内涝灾害影响、增加城市韧性提供技术支撑。     

合流制箱涵末端水质净化站设计及运行分析

随着国家长江大保护行动计划的实施,长江流域一级支流黑臭水体河道亟需进行整治,以实现“清水绿岸,鱼翔浅底”的治理目标。重庆市花溪河为长江的一级支流,在其综合整治项目中,针对合流制箱涵溢流污染,提出了“源头雨污分流改造+末端新建水质净化站”的治理思路。其中土桥水质净化站的设计规模为1.0万m3/d,调蓄池设计容积为11 000 m3,出水执行准Ⅳ类标准。建成后的运行结果表明：在土桥箱涵排出的合流污水水量不同的工况下,通过采取末端截流、调蓄、净化等治理措施,土桥水质净化站运行正常,所排污水均达到排放标准并外排至花溪河。     

Scantling optimization based on convex linearizations and a dual approach—Part II

The development of the LBR-5 “Stiffened Panels Software” is included in the development of a new design methodology to ease and to improve preliminary studies of naval structures and floating hydraulic structures. It allows, as of the first draft, an optimization of the scantling of the structure's constituent elements. The ultimate target is to link standard design tools (steel structure CAD, hull form, hydrostatic curves, floating stability, weight estimation, etc.) with a rational optimization design module and a minimum construction cost (or minimum weight) objective function. It is developed to be a user-oriented tool. The optimization module is composed of three basic modules (OPTI, CONSTRAINT and COST) and a group of sub-modules (in external databases). Among these the user selects a set of relevant sub-modules (i.e. geometrical and structural constraints). Since the present optimization deals with least construction costs (as objective function), and uses an explicit objective function (not empirical), the user must specify labor costs (unitary material costs, welding, cutting, etc.). This paper is the second part of a series of two articles. The previous paper focused on the ‘Module-Oriented Optimization’ methodology and on the rational constraints (Rigo, Marine Structures 2001). This paper presents the optimization algorithm based on convex linearization and a dual approach (OPTI module). It also includes the optimization of a FSO unit as a detailed example.     

一类免维护成败型系统的贮存可靠性预测与评估

针对一类可局部更新维护的成败型系统的贮存可靠性特点，应用退化理论提出了该类系统的贮存可靠性预测模型，并推导出免维护的相似系统的贮存可靠性预测模型，利用有关试验统计数据对两类模型的预测精度进行验证与评估，结果表明，两类模型具有较好的预测精度和工程应用价值。     

广州海珠线储能式现代有轨电车低压供电网络设计

介绍了自主研发的广州海珠线储能式现代有轨电车辅助系统低压供电网络的结构,分析了两车联挂供电原理及不同供电列车线的控制逻辑,对蓄电池欠压及单台充电机的故障工况进行了故障应对分析。产品实际应用证明了该供电网络设计合理、运行稳定,能满足储能式现代有轨电车的使用要求。     

钒系储氢合金充放氢性能及其数据拟合研究

本文对氢燃料电池用钒基固溶体合金的充放氢性能及其吸附热力学、等温线及等温模型进行研究。采用P-C-T测试仪对钒系储氢合金进行活化并测试其充放氢性能,验证压力和温度对钒系储氢合金充放氢性能的影响,并在实验的基础上对其充放氢过程中所涉及到的吸脱附等温模型、热力学模型进行探讨。研究结果表明:钒系储氢合金在673 K、4 MPa的条件下可实现完全的活化,属于易活化类型储氢合金。在吸附反应第一阶段的吸附等温线拟合结果表明,从相关系数来看,钒系储氢合金的吸氢类型更接近Freundlich模型,热力学研究结果表明,钒系储氢合金的放氢过程为吸热反应。     

The use of hydrogen as a fuel for inland waterway units

Escalating apprehension about the harmful effects of widespread use of conventional fossil fuels in the marine field and in internal combustion engines in general, has led to a vast amount of efforts and the directing of large capital investment towards research and development of sustainable alternative energy sources. One of the most promising and abundant of these sources is hydrogen. Firstly, the use of current fossil fuels is. discussed focusing on the emissions and economic sides to emphasize the need for a new, cleaner and renewable fuel with particular reference to hydrogen as a suitable possible alternative. Hydrogen properties, production and storage methods are then reviewed along with its suitability from the economical point of view. Finally, a cost analysis for the use of hydrogen in internal combustion engines is carried out to illustrate the benefits of its use as a replacement for diesel. The outcome of this cost analysis shows that 98% of the capital expenditure is consumed by the equipment, and 68.3% of the total cost of the equipment is spent on the solar photovoltaic cells. The hydrogen plant is classified as a large investment project because of its high initial cost which is about 1 billion US$; but this is justified because hydrogen is produced in a totally green way. When hydrogen is used as a fuel, no harmful emissions are obtained.     

集装箱堆场作业优化模型与算法

研究铁路到站集装箱吊车作业优化,如何规划龙门吊的作业顺序,减少作业次数成为衡量堆场工作效率的关键。通过分析问题建立一个计划期内以倒箱次数最少为目标的多时段动态集装箱堆场箱位分配模型,减少龙门吊的作业次数,设计遗传算法求解。算例表明：该模型及算法能够有效地优化堆场内零散箱的箱位分配,提高集装箱堆场的作业效率。