Multi-Component Model of Diesel Sprays Under High Injection Pressure

The combustion efficiency of a diesel engine depends not only on spray characteristics but also on fuel-air mixing characteristics. Based on the original spray model, a new spray model is established in this paper to accurately predict the diesel spray, and then a multi-component evaporation model is added into it. The model takes the influence of component concentration gradient and species on its evaporation rate in the liquid phase into account. This paper studies the spray characteristics (spray penetration, spray angle and spray morphology) and fuel-air mixing characteristics (spray area, spray volume and air entrainment mass) using the spray model, and the results are compared with the experimental results. The comparison shows that the simulated spray penetration and spray angle are close to the experimental results with the average deviations less than 3%. Moreover, this paper studies the spray area, spray volume and air entrainment using empirical formula under different conditions. And the maximum deviations of the spray volume, spray area and air entrainment mass are less than 5% as compared with the test values. Overall, this spray model can predict the diesel spray characteristics and fuel-air mixing characteristics under high injection pressure accurately.     

中华之山!(诗歌)

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Analysis of factors that influence the sensor location problem for freeway corridors

The use of traffic sensors to acquire real‐time traffic information for intelligent transportation systems is becoming increasingly common. It is a challenge to determine where these sensors should be located to maximize the benefit of their use. This paper aims to illuminate the interaction of the sensor location problem (SLP) and its influencing factors, and to reveal the influencing mechanisms between those factors and the optimal sensor numbers. Firstly, we sum up the factors that influence the SLP for freeway corridors in detail and present the mathematical formulation of each factor. Then, given the parameters, which are derived from those influencing factors, the maximum integration value model (MIVM) and simplified MIVM are proposed for addressing the SLP. Finally, a real world case study, in which the simplified MIVM is used, is presented to illustrate how these factors influence the optimal sensor numbers and the maximum integration value, and also leads to the typical influencing patterns of those factors for freeway corridors. The results of the case study also demonstrate the effectiveness of the model and problem solving scheme. What is more, the suggestions for using the findings hereof in practical applications are put forward. Copyright © 2013 John Wiley & Sons, Ltd.     

淤泥质软基真空预压处理工艺探讨

针对淤泥质滩地软基,在天津地区真空预压工程的背景下进行了大量的无砂法真空预压施工工艺试验,对出现的问题进行了分析,并结合实践对工程施工工艺进行了探讨。     

早期糖尿病肾病的组织学及超微结构病变观察

报告 1 1例早期 型糖尿病患者的肾穿组织在光镜及电镜观察下的病理变化。结果表明其病变具有多样性 ,其超微结构变化对早期糖尿病肾病的确诊具有重要价值。     

LOCOTROL系统在HX_D2型机车上的应用

介绍了LOCOTROL无线分布式动力系统在HX_(D2)型电力机车上的应用,重点阐述了LOCOTROL无线分布式动力系统的功能、原理及通讯方式,以及在长大组合列车中所体现出来的优势,为将来2万t交直流机车混合编组提供了良好的发展前景。     

BIM模型在信号运维系统中的轻量化研究

在铁路信号系统运维过程中,由于BIM模型中包含有建设阶段的信息,造成系统数据冗杂、交互时间长,又由于信号设备种类繁多、布局分散,导致系统规模庞大,无形中降低了工作效率.本文对BIM模型进行轻量化方法研究,提出采用细节面片抑制法对模型进行处理,以达到使BIM模型轻量化的目的,取得良好效果.     

组合式钢板波纹管在大察高速公路的应用

察尔汗盐湖地区盐盖缺失地段地下水位高,地基土质不良(粉土),氯盐、硫酸盐含量高。修建混凝土构造物面临基础处理难、防腐难等问题。本文结合大察高速公路桥涵施工实际,就组合式钢波纹管在该地区施工的优点进行了阐述。     

消除公交串车——一种基于GPS与GIS的实时控制方法

城市公共交通系统是一个包含人、车、路、环境、能量和信息的高度非线性的大规模复杂系统。公交串车问题严重降低了公交服务的可靠性，本文综合运用系统工程理论与方法，给出了公交串车与大间隔的定义，提出了公交串车与大间隔问题的成因分析模型、基于BP人工神经网络的行车间隔预测模型和基于GPS与GIS的实时动态反馈控制模型。最后，对北京公交300路车所采集的680组数据进行了实证分析。分析结果表明所使用的方法能有效地消除公交串车问题，同时也能为公交企业自身的运营管理和乘客的出行规划提供有价值的决策参考。     

大连地铁3号线增设车站方案研究

基于大连地铁3号线车辆段物业开发及线路大修需求,对3号线既有线的配线形式、出入线发车效率、线路条件等方面进行深入研究,综合考虑近远期工程情况,推荐在大连湾站和金马站区间(以下简称"大金区间")初期增设侧式站台方案;后期根据出入线改造情况,可进行一岛一侧改造方案。