盐渍土机场毛细水迁移试验研究

通过室内模拟毛细水迁移试验,对盐渍土地区机场地基中不同压实度、不同含水量以及不同含盐量的毛细水上升进行了研究。结果表明,其含水量、含盐量、压实度不同,则毛细水上升速度、高度均有所差异。     

大容量快速公交系统(BRT)路面结构组合方案研究

该文结合北京市南中轴路大容量快速公交系统示范工程的实例,对其路面结构组合设计、施工、运营使用等情况进行跟踪总结。从多方面分析车站沥青路面出现车辙的原因,有针对性地提出所采取的处理措施和具体方案,并提出建议的路面结构组合方案,对类似工程的建设具有一定的参考价值。     

公交优先下城市出租汽车市场进出机制研究

准入与退出是出租汽车市场运营管理的源头环节。在公交优先及政府对准入退出实行管制的前提下,本文对公交优先下的出租汽车市场进行了定位,探讨了政府调控要素中的准入规模、准入主体、经营模式以及服务质量等内容,论证了以服务质量招投标为主体的准入模式是适合现阶段我国城市出租汽车行业发展要求的,并提出了具体的前提条件和实施要素;同时对出租汽车市场的退出机制进行了研究,提出了基于GDAHP法（Group Decision AHP）和加权积法的出租汽车市场退出决策流程、退市途径、退市层次以及相应的保障措施等内容。     

Thermal structure of glass fiber reinforce plastic support structure

The assembled form of thick-wall glass fiber reinforced plastics (GFRP) tube and OCr18Ni9 ansteniticstainless steel pipes was designed as the radius thermal-insulating and load-supporting structure in cryogenicvessels. In order to study the thermal leakage and gap changes on the support structure, as well as radiustemperature and stress distribution on GFRP tube, an experimental investigation has been taken. The resultsindicate that the support structure is proved to fit well as thermal-iusulating and load-supporting part in cryo-genic vessels, furthermore has high security during cryogenic applications.     

Numerical Simulation of Focused Wave and Its Uncertainty Analysis

On the basis of the transient water wave (TWW) theory, focused wave is generated in the circulating water channel. Numerical simulation of the focused wave is carried out by solving the Reynolds averaged Navier-Stokes (RANS) equations. The dynamic grid technique is adopted to simulate the motion of the wave maker, and the volume of fluid (VOF) method is used to capture the free surface of the wave. The simulation results are compared with the measured data, and good agreement is obtained. For quantitative estimation of the numerical simulation error and uncertainty, the uncertainty analysis method recommended by the International Towing Tank Conference (ITTC) procedure is performed for the simulation results of the surface elevations at different positions. Both grid-convergence and time-step-size convergence studies are conducted using three types of grids and time step sizes. The simulation results are all monotonously convergent in the verification procedure, and the validations of the simulated surface elevations with the positions at 3.5, 4.0 and 4.5m are all achieved by comparing with the validation uncertainty. It is found that the numerical simulation errors caused by the grid and time-step-size in the convergence studies have the same order of magnitude. In addition, the numerical errors and uncertainties for the surface elevations at different positions are compared and discussed in detail. This paper presents the first attempt to carry out the uncertainty analysis of the simulation of focused wave, and the effectiveness of the proposed verification and validation procedures in the uncertainty analysis is demonstrated.     

Experimental Study on Ship-Bank Interaction of Very Large Crude Carrier in Shallow Water

In order to assess the influence of ship-bank interaction on ship manoeuvring motion, planar motion mechanism (PMM) tests on a scale model of the KRISO very large crude carrier (KVLCC2) are conducted in different water depths in circulating water channel (CWC). The asymmetric hydrodynamic derivatives are defined to characterize the bank effect, and they are measured through the straight towing test with varying lateral displacements. The linear and nonlinear hydrodynamic derivatives are determined from the test data of the Fourier integral and mathematical regression model. The rudder and heading angles required at equilibrium conditions in different ship-bank distances are calculated by the manoeuvring model. The directional stability with varying ship-bank distances is studied in terms of eigenvalue analysis. Analysis based on the test results shows that the KVLCC2 model ship appears inherently unstable for keeping course in deep and shallow water conditions. When the ship-bank distance decreases, the increasing ship-bank interaction can dramatically affect some parameters of the criteria for course keeping.     

清洁发展机制(CDM)与西部地区项目融资

文章研究在西部地区推广清洁发展机制(CDM)项目,促进西部地区项目融资问题.内容包括:清洁发展机制(CDM)简介,国际、国内CDM规则介绍,CDM项目开发与项目融资,西部地区可开展的CDM项目,推动CDM项目实施的积极措施等.     

秦皇岛港重力式沉箱码头加深改造设计

结合秦皇岛港甲码头技术改造工程实例,介绍该工程中重力式沉箱码头加学改造的方法。     

洋山港集装箱滚装渡船船型方案探讨

针对洋山港建成国际集装箱深水港后的集装箱集疏运问题,及该航线特点,提出一种滚装渡船方案,从布置地位、性能要求等方面展开,对这种船型进行分析计算。结果表明：通过这种船型集疏运集装箱的过海成本较低。     

航母"基辅"到天津

听说天津新港来了一个庞然大物,是俄罗斯一艘退役航空母舰,好奇的人像潮水般地涌向码头,以求先睹为快.笔者凭着新闻工作的敏感意识,也卷入了人流之中.由于迎接它的各方面领导,加上又是重要而神秘的"军事尖端装备",公安保卫非常严格,没有证件没有关系根本不能靠前,只能遥遥相望.笔者属于新闻记者行列,又加上所靠码头是本单位的生产码头.理所当然地挤在了前边,并抢占了"有利地形",选择了最佳角度.