基于催化转化器起燃温度特性的道路车辆排放性能研究

运用催化转化器起燃温度特性，利用道路(天津市)状况下特定车型的催化转化器入口／出口温度分布特征，分析和研究了道路车辆排放性能；通过在底盘测功机上模拟道路车辆催化转化器入口／出口温度分布特征测量车辆排放并与ECEl5工况所得到的结果比较、验证。研究结果表明，天津市道路下的车辆实际排放要多于实验室测量。     

Computer Prediction on Stress Distribution During Laser Quenching

IntroductionInprocessofindustry,theproblemscoupIedwiththermaIandfOrceareusuaIIymet.LaserqueIlchinginvolvingphasetransformationisoneofthem.HowtosetupafitmatheInatica1modeltosimulatetl1elaserquenchingprocessandhowtocalculateandanalyzenumericallythestresgdistributionarefolIowedwithinterestbymanyresearchersIl'2'3J.Thoseeffol'tsareimportanttooPtilnizethetechnologyparametersandprovideareliablebasisforimprovingthesyntheticallymechanicspropertiesandtheuseagesofmaterials.Alongwithdevelopmentofcomp…     

船队运力过剩的解决方案

我想就航运界普遍担忧的运力过剩问题谈谈自己的看法。 首先来看一组数据：根据克拉克森统计，今年1～10月份全球新接订单合计9512万载重吨，同比增长162％。而截至2010年9月初，油轮、货轮和集装箱船的订单占现有船队的比例分别高达28．5％、54．5％和24．9％。     

中国主要港口集装箱码头吞吐量快报(2010年4月)

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模拟雨天行车的新型汽车刮水器耐久试验台研究

介绍一种新型汽车刮水器耐久试验台;通过洁净水系统和泥沙水喷洒系统,模拟车辆雨天行车时刮水器的实际工况,与传统刮水器耐久试验台相比,能够更加真实地验证汽车刮水器总成的耐久性能。     

Numerical Simulation and Optimization Design of Electromagnetic Fields in the Electromagnetic Casting of Copper Round Billet

IntroductionInrecentyOars,e1eCtrOmngneticcontinuouscashngtechnologyhasbeenexPerimentngandusinginmostcoUntris,WhichgainedwideaPPicathasinnon-ferrOUsmetalichstry.Atthesamehme,anUmerofsCholarshavecalculatedandmeasuredelectromagneticfields.MapnehqfieldmodelsofmpOREandMSlllhasgainedwideaPPlicationsinthesemodels.Someolsemodels,suchasH-offormula,alsohaVdescribeddistributingofelectromapneticfieldinelectromngneticcontinuouscashngwellandttuly.Electromapneticcontinuouscashngwithsofucontactmoldha…     

Application of the Controllable Quenching Technology to the Quenching and tempering Workpieces

IntroductionThequenchingandtemperingistheprimaryprocessinheattreating.HoweveY,itismoredifficulttoensurethecomprehensivemechanicalpropertiesofpartsfortheseveraleffectivefactorsinquenching,whichforexamplearechemicalcompositionofsteel,thecross-sectionofpan,quenchant,quenchseveritydeterminedbythecirculationrateandtemperatureofquenchant.Therefore,thecontrollablequenchingbecomesakeytechnique.S.WHan,etc[l1developedaimmersion-hmequenchingsystemtogetthecontrollableagitation,whichprovidesmaximumcoo1in…     

A method based on potential theory for calculating air cavity formation of an air cavity resistance reduction ship

This research is intended to provide academic reference and design guidance for further studies to determine the most effective means to reduce a ship’s resistance through an air-cavity. On the basis of potential theory and on the assumption of an ideal and irrotational fluid, this paper drives a method for calculating air cavity formation using slender ship theory then points out the parameters directly related to the formation of air cavities and their interrelationships. Simulations showed that the formation of an air cavity is affected by cavitation number, velocity, groove geometry and groove size. When the ship’s velocity and groove structure are given, the cavitation number must be within range to form a steady air cavity. The interface between air and water forms a wave shape and could be adjusted by an air injection system.     

市域轨道交通线路特点分析

通过总结分析国内外主要大城市市域轨道交通线的特点,给出了市域线的定义及其主要形式,并分析了市域线的特点及其在城市轨道交通网络中的作用和地位。市域线的建设可配合和引导城市发展,满足和方便城市客运交通需求,优化城市轨道交通的整体网络。