简介:AnewGraphicsProcessingUnit(GPU)parallelizationstrategyisproposedtoacceleratesparsefiniteelementcomputationforthreedimensionalelectromagneticanalysis.TheparallelizationstrategyisemployedbasedonanewcompressionformatcalledslicedELLFour(slicedELL-F).TheslicedELL-Fformat-basedparallelizationstrategyisdesignedforhasteningmanyaddition,dotproduct,andSparseMatrixVectorProduct(SMVP)operationsintheConjugateGradientNorm(CGN)calculationoffiniteelementequations.ThenewimplementationofSMVPonGPUsisevaluated.TheproposedstrategyexecutedonaGPUcanefficientlysolvesparsefiniteelementequations,espe-ciallywhentheequationsarehugesparse(sizeofmostrowsinacoefficientmatrixislessthan8).NumericalresultsshowtheslicedELL-Fformat-basedparallelizationstrategycanreachsigni?cantspeedupscomparedtoCompressedSparseRow(CSR)format.
简介:ThecoreissueforChinatransitiondevelopmentinthenext30yearsistoshiftfromthequantitygrowthmodeltothequalityimprovementmodel.Thepaperintroducestheresearchprogressinthreekeyareasofsustainabledevelopmentstudiessincethe1990s.Itispointedoutthatthereisawell-beingthresh-oldatwhichthemarginutilityofeconomicgrowthforhumanwell-beingwilldecline,thatthereisanecologicallimitbeyondwhichmoreeconomicgrowthintermsofphysicalscalewillbeimpossible,andthatthecreationofhumanwell-beingisrelatednotonlytotheamountbutalsotothestructureandefficiencyofpublicexpenditurefromgovernment.Afteranin-depthdiscussiononfacts,originsandpolicyimplicationsofeachissue,sometheoryandpolicythinkingwithlong-lastingsignificanceareraisedforthetransitiondevelopmentofChina.
简介:Inordertoovercomemanyproblemsandshortcomingsofourthree-dimensionaldesigneducationinmechanicaldrawing,makethestudentsmasterthemoderndesignmethodandtechnologyeasily,modernmodelingmethodandshapingmethodareintroduced,andtheshapingdesigningmethodsofassembled-bodyareanalyzedincludingbasicrequirementsforshapingdesign,commonprinciplesofshapingandshapingdesignmethod.Itwillbehelpfultoimprovethespatialimaginationandmodellingabilityofstudent.
简介:WeobtainsolitonandplanewavesolutionsforthecouplednonlinearSchr?dingerequations,whichdescribethedynamicsofthethree-componentBose-EinsteincondensatesbyusingtheHirotamethod.Meanwhilewefindthatthesystemwhichhasattractiveatomicinteractionwillonlypossessashapechanging(inelastic)collisionpropertyduetointensityredistributionintheabsenceofthespin-exchangeinteraction.Asadiscussedexample,weinvestigatetheone-soliton,two-solitonsolutionsandcollisionaleffectsbetweenbrighttwo-soliotnsolution,whichleadtotheintensityredistribution.
简介:Thispaperpresentsanumericalapproachformodelingtheinteractionbetweenmultiplecracksinarectangularplateundercyclicloads.Itinvolvestheformulationoffatiguegrowthofmultiplecracktipsundermixed-modeloadingandanextensionofahybriddisplacementdiscontinuitymethod(aboundaryelementmethod)tofatiguecrackgrowthanalyses.Becauseofanintrinsicfeatureoftheboundaryelementmethod,ageneralgrowthproblemofmultiplecrackscanbesolvedinasingle-regionformulation.Inthenumericalsimulation,remeshingofexistingboundariesisnotnecessaryforeachincrementofcrackextension.Crackextensionisconvenientlymodeledbyaddingnewboundaryelementsontheincrementalcrackextensiontothepreviouscrackboundaries.Asanexample,thenumericalapproachisusedtoanalyzethefatiguegrowthofthreeparallelcracksinarectangularplate.Thenumericalresultsillustratethevalidationofthenumericalapproachandcanrevealtheefectofthegeometryofthecrackedplateonthefatiguegrowth.
简介:Tochangethecurrentphenomenonof'Beinganarmchairstrategist'intheresearchofasteppingmotor,thevirtualsimulationsystemofsteppingmotorwasdevelopedusingvirtualrealitytechnique.Thebasicprincipleofsteppingmotorwasexpounded.Thedevelopmentstrategyofthesimulationsoftwareisintroduced.Somekeyproblemsandtheirsolutions,includingcoordinatetransformationofrotorandorderofon-offelectricityforstator,wereputforwardinsystemdevelopment.Finally,therearethreevirtualsimulationexamplesoftheon-offelectricitywayinthispaper.Thisworkprovidesavaluableauxiliarytoolforthestudyofthesteppingmotor.
简介:Thegeneralequationsofsecondaryinstabilitywithrespecttothree-dimensionalsubharmonicdisturbancesarederivedandappliedtoBlasiusboundarylayerinthepresentpaper.Thetheoreticalresultsofevolutionandspatialdistributionofsubharmonicdisturbancesarecomparedwithexperimentaldata.There-suitsshowtheimportantroleoftheprocessofroutetotransitioninlow-disturbanceenvironments,andindi-catethatspatialmodeismorerationalthantemporalmode.
简介:InordertocompareandevaluatethreeanimalmodelsforstudyingthepathogenicityofStaphylococcusepidermidisstrains,threeexperimentalanimalmodels,namely,murineintra-venousLD50,mouseforeignbodyinfectionandratcentralvenouscatheter(CVC)infectionmodelswereusedtoassesstherelativevirulenceoftwoS.epidermidisstrains,ATCC12228and97-337.Theresultsfromthreeanimalmodelswerecomparable,indicatingS.epidermidis97-337wasmorevirulentthanstrainATCC12228.TheratCVCinfectionmodelbestmimickedtheconditionsofclinicalpatientswithintmvenonscatheters,andmoreinformationcouldbeobtainedfromthismodel.Weconcludethatdifferentinvivomodelsservefordif-ferentpurposes,andtheratCVCinfectionmodelismostsuitableforstudyingspecificcharacteristicsofcatheterrelatedinfectionscausedbyS.epidermidisstratus.
简介:Low-lyingstatesofaverticallycoupledthree-layerquantum-dotsystemarestudied.Eachlayercontainsoneelectron,andthetunnellingofelectronsbetweenlayersisneglected.EffectsoftheinterlayerseparationdandtheexternalmagneticfieldBareevaluatedbynumericalcalculations.Inthestrongcouplingcase(i.e.dissmall),asinasingledot,transitionsoftheangularmomentumLofthetruegroundstatesoccurwhenBincreases,whereasintheweakcouplingcasethetransitiondoesnotoccurandLremainszero.Furthermore,itisfoundthatthevariationofdmayalsoinducetheLtransition.Asaresult,aphasediagramofLofthetruegroundstateisgiveninthed-Bplane.
简介:Immersionofautomotivepartsinafluidizedbedoffoundrysandisusedtobothstripthecastingsfreefrommouldingsandandtoheat-treatthecastingsat500?C.Thefluidbedisheatedbyhotgasesfromaburnerdirectedfirstintoaserpentineheatexchangerlocatednearoneside-walloftherectangulartank,andthenintoadistributorconsistingofhorizontalspargerpipeshavingmaintenancestandpipesfixedintotheiruppersurfaces.