Control of spatiotemporal congested traffic patterns at highway bottlenecks.docx
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Controlofspatiotemporalcongestedtrafficpatternsathighwaybottlenecks
InChina,ademonstrationprogramforthefuelcellbusfleetoperatedattheBeijingOlympicsin2008andtheShanghaiExpoin2010.Itisnecessarytodevelopcomprehensiveprotonexchangemembranefuelcell(PEMFC)diagnostictoolstoincreasethereliabilityofthesesystems.Itisespeciallycriticalforfuel-cellcitybusesservinglargenumbersofpassengersusingpublictransportation.Thispaperpresentsadiagnosticanalysisandimplementationstudybasedonthesigneddirectedgraph(SDG)methodforthefuel-cellsystem.Thisdiagnosticsystemwassuccessfullyimplementedinthefuel-cellbusfleetattheShanghaiExpoin2010.
ArticleOutline
Nomenclature
1.Introduction
2.Diagnosiscombiningquantitativewithqualitativeanalysis
2.1.Stackmodel
2.2.Hydrothermalsystemmodel
2.3.Airsystemmodel
3.FuelcellsystemSDGdiagnosismodel
4.Conclusion
Acknowledgements
References
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Highlights
►Combinationofqualitativeandquantitativemodelingforfuelcellsystemdiagnosis.►EstablishmentoftheSDGdiagnosismodelforPEMfuelcellsystem.►ThefuelcellsystemfailureandcomponentsdegradationcanbewelldetectedandobservedattheShanghaiExpodemonstrationin2010.
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Aprobabilisticcellularautomatamodelforhighwaytrafficsimulation OriginalResearchArticle
ProcediaComputerScience,Volume1,Issue1,May2010,Pages337-345
MarceloZamith,ReginaCéliaP.Leal-Toledo,MauricioKischinhevsky,EstebanClua,DiegoBrandão,AnselmoMontenegro,EdgarB.Lima
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AbstractAbstract|ReferencesReferences
Abstract
ThisworkpresentsaprobabilisticmodelforthemicroscopicsimulationoftrafficroadsbasedonNagel-Schreckenberg’smodel.Eachdriver’sbehaviorisdescribedthroughthecombinationofacontinuousprobabilityfunctionwithananticipatoryfeaturethatleadstoacounterflowvelocitytunning.Thesimulationsdevelopedanddescribedhereingiverisetoaphasediagramwhichresemblesandenrichesthefundamentaldiagram,initstheoreticalaswellasforrealdata.
244
Amodelforvehicle-inducednon-tailpipeemissionsofparticlesalongSwedishroads OriginalResearchArticle
AtmosphericEnvironment,Volume39,Issue33,October2005,Pages6088-6097
G.Omstedt,B.Bringfelt,C.Johansson
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Abstract
Oneofthemostimportantparametersthatcontrolsthesuspensionofroaddustparticlesintheairisroadsurfacemoisture.Thisiscalculatedeveryhourfromabudgetequationthattakesintoaccountprecipitation,evaporationandrunoff.Duringwetconditionsaroaddustlayerisbuiltupfromroadwearwhichstronglydependsontheuseofstuddedtyresandroadsanding.Thedustlayerisreducedduringdryroadconditionsbysuspensionofparticlesduetovehicle-inducedturbulence.Thedustlayerisalsoreducedbywash-offduetoprecipitation.Directnon-tailpipevehicleemissionsduetothewearandtearoftheroadsurface,brakesandtyresareaccountedforinthetraditionalwayasconstantemissionfactorsexpressedasmassemittedpervehiclekilometre.
ThemodelresultsarecomparedwithmeasurementsfrombothanarrowstreetcanyoninthecitycentreofStockholmandfromanopenhighwayoutsidethecity.Themodelisabletoaccountforthemainfeaturesintheday-to-daymeanPM10variabilityforthestreetcanyonandforthehighway.ApeakinthePM10concentrationistypicallyobservedinlatewinterandearlyspringintheNordiccountrieswherestuddedtyresareused.Thisbehaviourisduetoacombinationoffactors:
frequentconditionswithdryroads,highnumberofcarswithstuddedtyresandanaccumulatedroaddustlayerthatincreasessuspensionofparticles.ThestudyshowsthatusingaconstantemissionfactorforPM10orrelatingPM10emissionstoNOxcannotbeusedforpredictionofday-to-dayvariationsinPM10concentrationsinthetrafficenvironmentsstudiedhere.Themodelneedstodescribevariationsindustload,wetnessoftheroadandhowdustsuspensioninteractswiththeseprocesses.
ArticleOutline
Nomenclature
1.Introduction
2.Methodologyandmeasurementsites
2.1.Thestreetcanyonsite
2.2.Thehighwaysite
2.3.Modeldescription
2.4.Referenceemissionfactors
3.Results
3.1.Streetcanyonsite
3.2.Highwaysite
3.3.Sensitivityanalysis
4.Discussion
5.Conclusions
Acknowledgements
References
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245
Multiple-vehicletrafficaccidentsinHongKong OriginalResearchArticle
AccidentAnalysis&Prevention,Volume38,Issue6,November2006,Pages1157-1161