An Experimental Study on the Drag Property of High Temperature Particles Falling into Cold Liquid Pool

This experiment is to study the special resistant induced by the high-speed evaporation surrounding the moving high-temperature particles. An observable equipment was designed, in which the first 11 experiments were performed by pouring one or several Zirconia spheres with various high-temperature and a diameter of 3-10mm into a water pool. The particles falling-down speeds were recorded by high-speed photographic instrumentation,and pressures and water temperatures were measured. A comparison between the experiments with cold and hot spheres respectively, employing three different sphere types each, was presented. The experimental data, com-pared with the theory of the evaporation drag model, are nearly identical.     

澜沧江景洪港治理河工模型试验研究

景洪港是交通部批准的国家级港口.近年来在景洪港下游多处修建建筑物,短期内使河势和流态发生较大改变,分析和研究景洪港的淤积变化并对其及早治理,具有重要的政治和经济意义.本文根据天然实测资料及河工模型试验资料,分析景洪港淤积变化的基本原因,并提出有效的治理措施供相关单位参考.     

高速公路绿化降噪效果的心理感受调查与分析

以南京机场高速和江苏淮盐高速盐城段的典型路侧绿化带为对象,重点探讨了高速公路降噪林带的结构、郁闭度、季节等因素与绿化降噪心理的作用关系。结果表明,郁闭度较大的混合型结构林带对心理烦恼度的改善作用较大,夏季对心理改善的程度较冬季明显。     

宽幅大跨径钢桁梁桥拖拉施工工艺及施工控制技术研究

沪宁高速公路扩建工程中锡澄运河大桥和北兴塘大桥的钢桁梁都采用拖拉施工法进行架设,具有跨度与自重大、桥面宽的特点,施工难度较大。本文对该拖拉施工项目中关键施工工艺和施工控制技术专项研究的主要成果进行了介绍,可为今后类似工程提供可借鉴的经验。     

基于评价指数的属性约简算法

从粗糙集理论出发,提出可分辨关系和对象差异矩阵的概念,并以此为基础构造出基于评价指数的属性约简算法.算法采用自底向上的方法,利用属性的评价指数作为启发式信息,求得属性集合的约简.在多个UC I数据集上进行试验,理论分析和实验数据表明,文中提出的属性约简算法是有效、可行的,具有较高的效率.     

振动压路机五自由度减振模型求解的一种新方法及仿真分析

根据对振动压路机考虑各系统阻尼后的五自由度减振模型的分析,对该模型进行了求解,并结合振动压路机的设计参数对求解的结果进行了仿真。通过求解及仿真结果可得：与两自由度模型相比,这种求解方法求解的五自由度模型同样简单可行并且分析问题更加全面,能为振动压路机各个模块的减振优化设计提供更好的理论参考依据。     

Application of advanced sampling for efficient probabilistic traffic modelling

In probabilistic traffic models, consideration of stochasticity in the dynamics of traffic gives a closer representation of a traffic system in comparison to that of a deterministic approach. Monte Carlo simulation is a broadly accepted method to consider variations in traffic within modelling. In this contribution, the possibility of increasing the efficiency of probabilistic traffic flow models using Monte Carlo simulation is analysed using variance reduction techniques and sequencing, for varied capacity and traffic demand values. The techniques of Importance Sampling, Latin Hypercube Sampling and Quasi-Random Sequencing are compared in a dynamic macroscopic traffic model to demonstrate the effectiveness of these techniques for reduction of the computational load when considering multiple input variations. Demonstration of their efficiency in traffic modelling is expected to lead to a wider application of the methods in practice.     

济南市轨道交通规划建设的思考

通过对济南市概况的介绍，引出建设轨道交通的必要性，以济南轨道交通建设规划图为例，提出了济南市轨道交通规划建设的建议与思考，特别提出了泉水保护与轨道交通建设的关系，线路交叉结点的无缝换乘问题及高架线路的隔音降噪问题，可为济南市轨道交通建设提供一定的借鉴。     

基于占道施工的交通影响分析阈值确定方法研究

针对日益严重的占道施工问题,从建立占道施工交通影响分析阈值的思路出发,确定阈值的指标形式及其计算方法,并在充分考虑各施工路段的交通状况差异性的基础上,给出各施工路段阈值的计算方法及其判定流程,最后进行案例分析。研究成果对于占道施工交通影响分析阈值的建立有指导意义。     

Minimum acceptable time for turning off idling engines: Evidence from Taiwan

This paper examines the influence of different factors on motorist willingness to comply with idling stop regulations, as determined using stated preference analysis. Motorists were surveyed at urban roadsides in Taiwan, and the results obtained were analyzed using a partially adaptive model. The analysis showed that the standing time and turnoff idling engine while parking are both significant variables, and arise from risk aversion behavior. Environmental perceptions and convenience of use are the most influential factors, according to elasticity analysis. The study also verifies that a partially adaptive model is an appropriate model to consider censored data in a Triple-Bounded Dichotomous Choice analysis. These results will be useful as a reference for improving implementation of idling reduction regulations.