城市建成区智能化轨道快运系统的线路规划

介绍了智能化轨道快运系统的技术特点及优势,分析了建成区道路拓宽困难、道路交通流量大、用地空间有限等现实条件,并从线路敷设、路权方式、车站设置等方面讨论了智能化轨道快运系统规划的相关内容.以重庆市南滨路智能化轨道快运系统线路为应用案例提出规划建议.     

大型体育赛事开闭幕式交通组织策划

大型体育赛事开闭幕式的人流、车流高度集中,对服务水平保障要求严格,媒体关注度较高.基于多项大型体育赛事开闭幕式交通组织方案编制和实施过程的思考,探讨开闭幕式交通需求的特点与挑战、交通组织策略、方案评估方法和指挥体系.指出开闭幕式交通组织策划需根据仪式流程,安保政策,各客户群体起讫点、出行时间和服务模式等,采用交通模型和仿真方法,评估不同方案下高峰时段道路负荷、人流负荷,并发现风险区域.据此构建开闭幕式交通策划的步骤和方法框架,阐述各步骤的分析方法.研究证明,针对开闭幕式交通特点,采用科学的交通组织策略、系统的方案评估和优化方法,构建高效的指挥架构,持续的团队磨合及演练是开闭幕式交通组织成功的关键.     

S^2 BHCA Multiple AUVs cooperation oriented control architecture

Oceanographic survey, or other similar applications should be the applications of multiple AUVs. In this paper, the skill ＆ simulation based hybrid control architecture （S^2BHCA） as the controller＇s design reference was proposed. It is a multi-robot cooperation oriented intelligent control architecture based on hybrid ideas. The S^2BHCA attempts to incorporate the virtues of the reactive controller and of the deliberative controller by introducing the concept of the ＂skill＂. The additional online task simulation ability for cooperation is supported, too. As an application, a multiple AUV control system was developed with three ＂skills＂ for the MCM mission including two different cooperative tasks. The simulation and the sea trials show that simple task expression, fast reaction and better cooperation support can be achieved by realizing the AUV controller based on the S^2BHCA.     

胃食管反流性胸痛的临床特点及食管测压分析

对２４例胃食管反流性胸痛患者的食管测压分析，显示可出现食管下扩约肌静止压及食管上扩约肌静止压异常升高、体部高幅蠕动或蠕动紊乱等不同类型的食管运动障碍。表明胃食管反流性胸痛的发生与这种食管的运动障碍有关。对其发生机理及临床特点进行了讨论。     

中小企业税收筹划问题探析

随着改革开放的不断深入,市场经济的进一步发展,特别是中国加入WTO以后,如何进行税收筹划来提升企业自身价值已成为众多企业关注的焦点。本文阐述了中小企业税收筹划上存在的诸多问题并在此基础上提出了关于如何改善中小企业税收筹划的相关方法。     

A second order volume of fluid （VOF） scheme for numerical simulation of 2-D breaking waves

Among all environmental forces acting on ocean structures and marine vessels, those resulting from wave impacts are likely to yield the highest loads. Being highly nonlinear, transient and complex, a theoretical analysis of their impact would be impossible without numerical simulations. In this paper, a pressure-split two-stage numerical algorithm is proposed based on Volume Of Fluid (VOF) methodology. The algorithm is characterized by introduction of two pressures at each half and full cycle time step, and thus it is a second-order accurate algorithm in time. A simplified second-order Godunov-type solver is used for the continuity equations. The method is applied to simulation of breaking waves in a 2-D water tank, and a qualitative comparison with experimental photo observations is made. Quite consistent results are observed between simulations and experiments. Commercially available software and Boundary Integral Method (BIM) have also been used to simulate the same problem. The results from present code and BIM are in good agreement with respect to breaking location and timing, while the results obtained from the commercial software which is only first-order accurate in time has clearly showed a temporal and spatial lag, verifying the need to use a higher order numerical scheme.     

Experimental study on the width of the turbulent area around bridge pier

At present, the method of calculating the turbulent flow width around the bridge pier is not given in the "Standard for Inland River Navigation" (GB50139-2004) in China, and the bridge designer usually increases the bridge span in order to ensure the navigation safety, which increases both of the structural design difficulty and the project investments. Therefore, it is extremely essential to give a research on the turbulent flow width around the bridge pier. Through the experiments of the fixed bed and the mobile bed, the factors influencing the turbulent flow width around the bridge pier have been analyzed, such as the approaching flow speed, the water depth, the angles between the bridge pier and the flow direction, the sizes of bridge pier, the shapes of the bridge pier, and the scouring around the bridge pier, etc. Through applying the dimension analytic method to the measured data, the formula of calculating the turbulent flow width around the bridge pier is then inferred.     

JK00430型机车走行部车载检测装置在内燃机车上的运用分析

介绍了JK00430型机车走行部车载检测装置的运用,提出了该装置发生报警后的科学处理办法。     

Mixed analysis of shell and solid elements using the overlaying mesh method

 This article presents a mixed method of analyzing shell elements and solid elements using the overlaying mesh method. In the structural design of a ship's hull, the shell elements are used for the global model. However, the solid elements are necessary to analyze the stress concentration zones or the vicinity of a crack. In such cases, the models are analyzed using zooming analysis, in which the results of a global model analysis are transferred to a local model analysis by imposing boundary conditions. This method is more advantageous than zooming analysis in terms of the accuracy of the solution and the modeling flexibility. Some examples of a plate model with a cracked surface or with a projection are shown in order to demonstrate the effectiveness of the method. Received: August 6, 2002 / Accepted: November 25, 2002 Address correspondence to: S. Nakasumi (sumi@nasl.t.u-tokyo.ac.jp) Updated from the Japanese original, which won the 2002 SNAJ prize (J Soc Nav Archit Jpn 2001;189:219–224; and 190:655–662)     

Dynamic Simulation of a Smart Crank and Slider Mechanism

In this paper, a smart crank and slider mechanism is analyzed mostly from a dynamic view. By means of dynamic explicit finite element method, 3D nonlinear structure is simulated. It is proved that the mechanism can effectively accomplish smart movement prescribed. And in order to ensure reciprocal movement with higher frequency, measures should be taken to avoid over heating of parts. Compared with internal energy, kinetic energy of total rigid body is dominating, and Y direction equivalent rigid velocity is much higher than X direction velocity. Equivalent rigid velocity of all parts is consistent with respective movement condition. For both energy and velocity, slider effect is dominating. Three direction equivalent inertia force oscillates. Force amplitude in Y -direction is comparitively the greatest.