简介:ThepresentstatusofPPtechnologyinChinaispresented.ThroughareviewofsingleloopanddualloopPPreactortechnologyaswellasdevelopmentandutilizationofPPproductsitisconcludedthatimportofPPtechnologyshouldbebasedonthedemandofPPproductsandmarkettrendwithconsiderationoflocalconditions.TheexistingproblemsandfuturedevelopmentofPPtechnologyinChinaarediscussed.
简介:Inthispaper,adiscrete-timeanalysisofthethird-ordercharge-pumpbasedphase-lockedloops(CPLLs)ispresentedinthepresenceofloopdelay.Thez-domainanalysisoftheclosed-looptransferfunctionisderivedandcomparedwiththetraditionals-domainmethod.ThesimulationresultsunderSPECTREshowthat,duetothesamplingnatureofCPLL,thetraditionals-domainanalysisisunabletopredictitsjitterpeakingaccurately,especiallywhentheloopdelayistakenintoconsideration.Theimpactofloopdelayonthestabilityofthethird-orderCPLLsystemisfurtheranalyzedbasedontheproposedway.ThestabilitylimitofthewidebandwidthCPLLwithloopdelayiscalculated.Thecircuitsimulationresultsagreewellwithmathematicalanalysis.
简介:Overthepasttwodecadesconsiderableprogresshasbeenmadeinunderstandingtheototoxiceffectsandmechanismsunderlyingloopdiuretics.Astypicalrepresentativeofloopdiureticsethacrynicacidorfurosemideonlyinducestemporaryhearingloss,butrarelypermanentdeafnessunlessappliedinsevereacuteorchronicrenalfailureorwithotherototoxicdrugs.Loopdiureticinduceuniquepathologicalchangesinthecochleasuchasformationofedematousspacesintheepitheliumofthestriavascularis,whichleadstorapiddecreaseoftheendolymphaticpotentialandeventuallossofthecochlearmicrophonicpotential,summatingpotential,andcompoundactionpotential.LoopdiureticsinterferewithstrialadenylatecyclaseandNat/Kt-ATPaseandinhibittheNa-K-2Clcotransporterinthestriavascularis,howeverrecentreportsindicatethatoneoftheearliesteffectsinvivoistoabolishbloodflowinthevesselssupplyingthelateralwall.Sinceethacrynicaciddoesnotdamagethestriavascularisinvitro,thechangesinNat/Kt-ATPaseandNa-K-2Clseeninvivomaybesecondaryeffectsresultsfromstrialischemiaandanoxia.Recentobservationsshowingthatreninispresentinpericytessurroundingstriaarteriolessuggestthatdiureticsmayinducelocalvasoconstrictionbyreninsecretionandangiotensinformation.Thetightjunctionsintheblood-cochleabarrierpreventtoxicmoleculesandpathogensfromenteringcochlea,butwhendiureticsinduceatransientischemia,thebarrieristemporarilydisruptedallowingtheentryoftoxicchemicalsorpathogens.
简介:Inthispaper,anewlooptransformationisproposedthatcanexpolitparalleisminloopswhichcannotbefoundbytraditionalmethods.Thenthemethodisextendedtoshowhowtoachievemaximumspeedupofloopsifthereareinfiniteprocessorsandhowtobalancetheworkloadofparallelsectionsinloopsifthereisfixednumberofprocessors.
简介:At-speedtestingusingexternaltesterrequiresanexpensiveequipment,thusbuilt-inself-test(BIST)isanalternativetechniqueduetoitsabilitytoperformon-chipat-speedself-testing.ThemainissueinBISTforat-speedtestingistoobtainhighdelayfaultcoveragewithalowhardwareoverhead.Thispaperpresentsanimprovedloop-basedBISTscheme,inwhichaconfigurableMISR(multiple-inputsignatureregister)isusedtogeneratetest-pairsequences.ThestructureandoperationmodesoftheBISTschemearedescribed.Thetopologicalpropertiesofthestate-transition-graphoftheproposedBISTschemeareanalyzed.Basedonit,anapproachtodesignandefficientlyimplementtheproposedBISTschemeisdeveloped.ExperimentalresultsonacademicbenchmarkcircuitsarepresentedtodemonstratetheeffectivenessoftheproposedBISTschemeaswellasthedesignapproach.
简介:与exascale来超级计算的时代,电源效率成为了最重要的障碍造一个exascale系统。Dataflow建筑学在为科学应用完成高电源效率有本国的优点。然而,最先进的dataflow体系结构没能为循环处理利用高并行。处理这个问题,我们建议一个pipelining环优化方法(PLO),它在处理元素(PE)在环流动做重复dataflow的数组加速器。这个方法由二种技术,帮助建筑学的硬件重复和帮助说明的软件重复组成。在硬件重复执行模型,一个在薄片上循环控制器被设计产生循环索引,减少计算内核并且打为pipelining执行的一个好基础的复杂性。在软件重复实行模型,另外的环指令被论述解决重复相关性问题。经由这二种技术,准备好了每周期执行的指令的平均数字被增加使浮点联合起来忙。当这二种技术的硬件费用是可接受的时,模拟结果证明分别地,我们的建议方法平均由2.45x和1.1x在浮点效率超过静电干扰和动态循环执行模型。
简介:AnewmethodforconstructinginterpolatingLoopsubdivisionsurfacesispresented.ThenewmethodisanextensionoftheprogressiveinterpolationtechniqueforB-splines.GivenatriangularmeshM,theideaistoiterativelyupgradetheverticesofMtogenerateanewcontrolmeshMsuchthatlimitsurfaceofMwouldinterpolateM.ItcanbeshownthattheiterativeprocessisconvergentforLoopsubdivisionsurfaces.Hence,themethodiswell-defined.Thenewmethodhastheadvantagesofbothalocalmethodandaglobalmethod,i.e.,itcanhandlemeshesofanysizeandanytopologywhilegeneratingsmoothinterpolatingsubdivisionsurfacesthatfaithfullyresembletheshapeofthegivenmeshes.Themeshesconsideredherecanbeopenorclosed.
简介:ThispaperintroducestherecentappearanceofacirculareconomyinsuchindustrializedcountriesasGermanyandJapanandoutlinesitsconceptandprinciples.Theauthoremphasizesthatacirculareconomyshouldbecomethebreakthroughpointforsustainabledevelopmentandwillenableashifttoasustainablesocietyof'doinglesswithless'awayfromthecurrenthigh-consumptionsocietyof'doingmorewithmore'
简介:<正>Inthispaper,wemakeacompletestudyoftheunfoldingofaquadraticintegrablesystemwithahomoclinicloop.MakingaPoincaretransformationandusingsomenewtechniquestoestimatethenumberofzerosofAbelianintegrals,weobtainthecompletebifurcationdiagramandallphaseportraitsofsystemscorrespondingtodifferentregionsintheparameterspace.Inparticular,weprovethattwoisthemaximalnumberoflimitcyclesbifurcatingfromthesystemunderquadraticnon-conservativeperturbations.
简介:Adistibutedoptimallocaldoubleloop(DOLDL)networkispresented.EmphasisislaidonthetopologyanddistributedroutingalgorithmsfortheDOLDL.Onthebasisofbuildinganabstractmodel,asetofdefinitionsandtheoremsaredescribedandproved.Analgorithmwhichcanoptimizethedoubleloopnetworksispresented.TheoptimalvaluesofthetopologicparametersfortheDOLDLhavebeenobtainedbythealgorithm,andthesenumer.calresultsareanalyzed,Thestudyshowsthattheboundsoftheoptimaldiameter(d)andaveragehopdistance(a)forthisclassofnetworksareand,respectively(Nisthenumberofnodesinthenetwork.「3≤N≤10~4).AclassofthedistributedroutingalgorithmsfortheDOLDLandtheimplementationprocedureofanadaptivefault-tolerantalgorithmareproposed.Thecorrectnessofthealgorithmhasbeenalsoverifiedbysimulating.
简介:Thisstudydefinesandassessestheselectionciiteriaforsuitableparticulatematerialstobeusedinanupflowbubblingfluidizedbed(UBFB)ordenseup-flowpowdercirculationsystemforsolarenergycaptureandstorage.Themaincriteriaidentifiedarebasedonthethermophysicalandthermomechanicalproperties,attritionbehavior,andtheconsiderationsofhealthandenvironmentalhazardsofthecandidatepowders.Finally,acostcomparisonandtentativerankingofthedifferentcandidatepowdersispresentedinadditiontoaweightedscoring.Significantscoringdifferencescanbeobservedbetweenthevariousmaterials.Olivinepossessesthemostfavorablecharacteristicsandappearstobetheparticulatematerialofchoiceforsolid/gassuspensionheattransferfluids.
简介:Inthestrapdowninertialnavigationsystem,theFiberOpticalGyro(FOG)musthavehighprecisiontogiveaccuratenavigationinformation.Inthispaper,adigitalclosedloopdetectionmethodbasedontherampwavemodulatingtechnigueisintroduced.DSPandFPGAhavemanyadvantagesindigitalsignalprocessing.Inthedesign,byusingDSP,acomplexarithmeticoperationiscompletedtomeettheneedsofclosedloopcontrolofFOGwithinashorttime.AllkindsofcontrolsignalsareproducedeasilybyFPGA,underwhichDSPcouldworkproperly.CombiningtheDSPandFPGA,thedetectingmethodisimplementedsuccessfully.Intheend,theresultoftestandperformanceisgiven.FromtheresultwecanconcludethattheprecisionofFOGisimprovedandthenoisesarelimitedtoalowlevel.
简介:Thenon-minimumphasefeatureoftail-controlledmissileairframesisanalyzed.Threeselectionstrategiesfordesiredperformanceindexesarepresented.Anaccelerationautopilotdesignmethodologybasedonoutputfeedbackandoptimizationisproposed.Performanceandrobustnesscomparisonsbetweenthetwo-loopandclassicalthree-looptopologiesaremade.Attemptstoimprovetheclassicalthree-looptopologyarediscussed.Despitethesameopen-loopstructure,theclassicalthree-loopautopilotshowsdistinctcharacteristicsfromatwo-loopautopilotwithPIcompensator.Boththetwo-loopandthree-looptopologiescanstabilizeastaticunstablemissile.However,thefiniteactuatorresourceisthecrucialfactordominatingautopilotfunction.
简介:瞄准靠近环的水系统,由方法关上某些subcircuit,并且解决尖网络,另外的subcircuits的计算流动偏差,然后与各种各样的因素分析稳定性的变化的规则,后面的结论被获得:当在主要管子中减少抵抗时,subcircuits的增加的抵抗,系统稳定性能被改进。由改变力量的集中的规定没在系统稳定性上有影响;由改变电阻愿望减少系统稳定性的集中的规定。泵特征曲线影响系统稳定性,扁平的特征的稳定性比陡峭的优异。为直接回来系统(医生),来自热来源最远的subcircuit的稳定性是最糟。为反向的回来系统(RRS),在管子网络的中间的subcircuit的稳定性有最糟的稳定性。总的来说,RRS的稳定性低于医生关键词靠近环的水系统的-稳定性-流动偏差-直接回来系统-反向的回来系统CLC数字TK172