简介:TheATLASdetectorisoneofthemostsophisticatedandhugedetectorseverdesigneduptonow.Adetailed,flexibleandcompletesimulationprogramisneededinordertostudythecharacteristicsandpossibleproblemsofsuchachallengingapparatusandtoanswertoallraisingquestionsintermsofphysics,designoptimization,etc.TocopewiththeseneedsweareimplementinganapplicationbasedonthesimulationframeworkFADS/Goofy(FrameworkforATLASDetectorSimulation/Geant4-basedObject-OrientedFolly)intheGeant4environment.Theuser'sspecificcodeimplementationispresentedindetalilsforthedifferentapplicationsimplementeduntilnow,fromthevariouscomponentsoftheATLASspectrometertopsomeparticulartestbeamfacilities,particularemphasisisputindescribingthesimulationoftheMuonSpectrometeranditssubsystemsasatestcasefortheimplementationofthewholedetectorsimulationprogram:theintrinsiccomplexityinthegeometrydescriptionoftheMuonSystemisoneofthemoredemandingproblemsthatarefaced.Themagneticfieldhandling,thephysicsimpactintheeventprocessinginpresenceofbackgroundsfromdifferentsourcesandtheimplementationofdifferentpossiblegenerators(includingPythia)arealsodiscussed.
简介:Inthispaperresultsofpreviousresearchesoftwo-modefullenginemodelforMachnumberrangefrom3to6arepresented.Themainaimsofresearchesaretoobtaincharacteristicsoffullenginemodelanditscomponents(theinlet,thecombustionchamberandthenozzle)inramjetandscramjetregimesandtocomparethesecharacteristicswiththecalculationresultsaccordingtoCFDandtoapproximate(engineering)methods.Testswerecarriedoutwithoutfuelsupply(coldtests)andwithfulelsupply(studyofignitionandcombustion).Hydrocarbonandhydrogenfuel(gaseousorliquid)wereusedduringthetests.
简介:Tetrahedralamorphoushydrogenatedcarbon(ta-C:H)filmsonSi(lO0)substrateswerepreparedbyusingamagnetic-field-filterplasmastreamdepositionsystem.Sampleswithdifferentratiosofsp^3-bondtosp^2-bondwereobtainedbychangingthebiasvoltageappliedtothesubstrates.Theellipsometricspectraofvariouscarbonfilmsinthephotonenergyrangeof1.9-5.4eVweremeasured.Therefractiveindexnandtherelativesp^3CratioofthesefilmswereobtainedbysimulatingtheirellipsometricspectrausingtheForouhi-BloomermodelandbyusingtheBruggemaneffectivemediumapproximation,respectively.Thehaemocompatibilityoftheseta-C:Hfilmswasanalysedbyobservationofplateletadhesionandmeasurementofkineticclottingtime.Theresultsshowthatthesp^3Cfractionisdependentonthesubstratebiasvoltage,andthehaemocompatibilityisdependentontheratioofsp^3-bondtosp^2-bond.Agoodhaemocompatibilitymaterialofta-C:Hfilmswithasuitablesp^3Cfractioncanbepreparedbychangingthesubstratebiasvoltage.
简介:在一台接近音速的离心的压缩机发展的流动的完整的体环模拟在二个稳定的操作点(山峰效率和近的巨浪)并且在路径期间被执行澎湃。以稳定的条件,流动地性质被比较用落后途径以前执行了的一个阶段与试验性的数据和数字模拟分析。关于舞台外套表演,一个优秀协议在数字结果之间被获得(两个与时间落后途径和完整体环的计算)并且实验。从完整体环的模拟,在到巨浪的从山峰效率的流动模式的变化被发现非常类似于用时间从模拟获得了那落后途径。特别地,如果操作的点是稳定的,流动证明是chorochronic.The完整体环模拟在法律在数字领域的出口使用了的throttle在一个唯一的小面值硬币以后被继续。集体流动,压力比率和效率然后显著地更加掉时间进步。模拟变得不稳定并且很好在进行之中的巨浪开始。澎湃的路径被发现由于根据从chorochronic模拟和实验得出的结论的更弥漫的翼的吸方面上的边界层分离的增大。但是当时间进行,流动失去它的chorochronic特性。在约7%转子速度点旋转的货摊房间在约5条革命开发并且导致巨浪。
简介:Developinganelectrostaticdischarge(ESD)protectiondevicewithabetterlatch-upimmunityhasbeenachallengingissueforthenanometercomplementarymetal-oxidesemiconductor(CMOS)technology.Inthiswork,animprovedgrounded-gateN-channelmetal-oxidesemiconductor(GGNMOS)transistortriggeredsilicon-controlledrectifier(SCR)structure,namedGGSCR,isproposedforhighholdingvoltageESDprotectionapplications.TheGGSCRdemonstratesadoublesnapbackbehaviorasaresultofprogressivetrigger-onoftheGGNMOSandSCR.Thedoublesnapbackmakestheholdingvoltageincreasefrom3.43Vto6.25Vascomparedwiththeconventionallow-voltageSCR.TheTCADsimulationsarecarriedouttoverifythemodesofoperationofthedevice.
简介:我们报导当前的摆动anddc-voltage-controlled的详细理论研究在做的GaAs/AlAs反响的通道超点阵在下面的混乱动力学交叉电并且磁场。当超点阵在否定微分速度区域被偏导时,当前的自激振荡与合适的做的集中被观察。当前的摆动模式和摆动频率能被dc电压偏爱影响,做密度,并且磁性删除。什么时候交流电与固定振幅删除,频率也被用于系统,不同非线性的性质与dcvoltage的变化出现在外部电路偏爱。我们小心地与不同检测混乱的方法学习这些非线性的性质。
简介:提高技术的力量质量(PQ)的主要目的为敏感负担在需要的频率维持指定电压大小不管力量分发网络上的差错。动态电压restorer(DVR)是过去常减轻电压的一台设备下垂调整负担电压。这篇论文论述一个数学模型因为导致系列电压注射减轻从而下垂象在DVR和用途之间分享的力量一样完成用途力量因素的改进。分享的力量将作为每要求就可得到的分布式的产生(DG)而言补偿sags。减轻电压的途径用领先的系列电压注射的概念下垂对在电压的阶段移动不引起任何问题的那些地点合适。MATLAB/SIMULINKSimPowerSystem工具箱被用来获得模拟结果验证建议数学模型。
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