学科分类
/ 25
500 个结果
  • 简介:摘要:CPR1000系列机组(含M310和CPR1000)是目前国内在运的主力核堆型,LOOP事故(失去厂外主电源)是核电厂发生频率最高的事故工况,在国际同行和国内在运核电厂的历史上多次发生,对CPR1000核电机组在LOOOP事故下,进行正确、高效的控制,对于维持核电厂的核安全状态,防止事故恶化,保护公众和核电厂公众人员安全具有重要价值。

  • 标签: LOOP事故 控制 一回路压力
  • 简介:ThepresentstatusofPPtechnologyinChinaispresented.ThroughareviewofsingleloopanddualloopPPreactortechnologyaswellasdevelopmentandutilizationofPPproductsitisconcludedthatimportofPPtechnologyshouldbebasedonthedemandofPPproductsandmarkettrendwithconsiderationoflocalconditions.TheexistingproblemsandfuturedevelopmentofPPtechnologyinChinaarediscussed.

  • 标签: 聚丙烯 生产工艺 单循环反应器 双循环反应器 斯菲里坡尔法
  • 简介:Inthispaper,adiscrete-timeanalysisofthethird-ordercharge-pumpbasedphase-lockedloops(CPLLs)ispresentedinthepresenceofloopdelay.Thez-domainanalysisoftheclosed-looptransferfunctionisderivedandcomparedwiththetraditionals-domainmethod.ThesimulationresultsunderSPECTREshowthat,duetothesamplingnatureofCPLL,thetraditionals-domainanalysisisunabletopredictitsjitterpeakingaccurately,especiallywhentheloopdelayistakenintoconsideration.Theimpactofloopdelayonthestabilityofthethird-orderCPLLsystemisfurtheranalyzedbasedontheproposedway.ThestabilitylimitofthewidebandwidthCPLLwithloopdelayiscalculated.Thecircuitsimulationresultsagreewellwithmathematicalanalysis.

  • 标签: charge-pump based phase-locked LOOP (CPLL) THIRD-ORDER
  • 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.

  • 标签:
  • 简介:Inthispaper,anewlooptransformationisproposedthatcanexpolitparalleisminloopswhichcannotbefoundbytraditionalmethods.Thenthemethodisextendedtoshowhowtoachievemaximumspeedupofloopsifthereareinfiniteprocessorsandhowtobalancetheworkloadofparallelsectionsinloopsifthereisfixednumberofprocessors.

  • 标签: 并行编译程序 循环变换 计算机
  • 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.

  • 标签: 集成电路 自动检测设备 线路检测
  • 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。

  • 标签: 循环优化 建筑学 循环处理 执行模型 电源效率 应用程序
  • 简介:有在它的伴随模块的张肌产品的系数的概括的环Virasoro代数学的第一个cohomology组被显示小。结果被用来在概括的环Virasoro代数学上证明那个谎言是bialgebra结构是coboundary三角形。作者概括结果到概括地图Virasoro代数学。

  • 标签: VIRASORO代数 广义 循环 双代数 代数结构 张量积
  • 简介:AnewmethodforconstructinginterpolatingLoopsubdivisionsurfacesispresented.ThenewmethodisanextensionoftheprogressiveinterpolationtechniqueforB-splines.GivenatriangularmeshM,theideaistoiterativelyupgradetheverticesofMtogenerateanewcontrolmeshMsuchthatlimitsurfaceofMwouldinterpolateM.ItcanbeshownthattheiterativeprocessisconvergentforLoopsubdivisionsurfaces.Hence,themethodiswell-defined.Thenewmethodhastheadvantagesofbothalocalmethodandaglobalmethod,i.e.,itcanhandlemeshesofanysizeandanytopologywhilegeneratingsmoothinterpolatingsubdivisionsurfacesthatfaithfullyresembletheshapeofthegivenmeshes.Themeshesconsideredherecanbeopenorclosed.

  • 标签: 几何模型 环分割表面 循环插值 拓扑 网眼
  • 简介:ThispaperintroducestherecentappearanceofacirculareconomyinsuchindustrializedcountriesasGermanyandJapanandoutlinesitsconceptandprinciples.Theauthoremphasizesthatacirculareconomyshouldbecomethebreakthroughpointforsustainabledevelopmentandwillenableashifttoasustainablesocietyof'doinglesswithless'awayfromthecurrenthigh-consumptionsocietyof'doingmorewithmore'

  • 标签:
  • 简介:<正>Inthispaper,wemakeacompletestudyoftheunfoldingofaquadraticintegrablesystemwithahomoclinicloop.MakingaPoincaretransformationandusingsomenewtechniquestoestimatethenumberofzerosofAbelianintegrals,weobtainthecompletebifurcationdiagramandallphaseportraitsofsystemscorrespondingtodifferentregionsintheparameterspace.Inparticular,weprovethattwoisthemaximalnumberoflimitcyclesbifurcatingfromthesystemunderquadraticnon-conservativeperturbations.

  • 标签: A QUADRATIC INTEGRABLE system A HOMOCLINIC
  • 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.

  • 标签: routing LOCAL TOPOLOGY TOLERANT verified BOUNDS
  • 简介:Thisstudydefinesandassessestheselectionciiteriaforsuitableparticulatematerialstobeusedinanupflowbubblingfluidizedbed(UBFB)ordenseup-flowpowdercirculationsystemforsolarenergycaptureandstorage.Themaincriteriaidentifiedarebasedonthethermophysicalandthermomechanicalproperties,attritionbehavior,andtheconsiderationsofhealthandenvironmentalhazardsofthecandidatepowders.Finally,acostcomparisonandtentativerankingofthedifferentcandidatepowdersispresentedinadditiontoaweightedscoring.Significantscoringdifferencescanbeobservedbetweenthevariousmaterials.Olivinepossessesthemostfavorablecharacteristicsandappearstobetheparticulatematerialofchoiceforsolid/gassuspensionheattransferfluids.

  • 标签: Concentrated SOLAR power Particle-in-tube RECEIVER PARTICLE
  • 简介:摘要本文主要围绕Loop代数上的非退化对称不变双线性型进行研究,构造了对称自对偶Loop代数并确定了一类对称自对偶Loop代数的极大可解对称自对偶子代数.

  • 标签: 李代数 Loop代数 双线性型
  • 简介:Inthestrapdowninertialnavigationsystem,theFiberOpticalGyro(FOG)musthavehighprecisiontogiveaccuratenavigationinformation.Inthispaper,adigitalclosedloopdetectionmethodbasedontherampwavemodulatingtechnigueisintroduced.DSPandFPGAhavemanyadvantagesindigitalsignalprocessing.Inthedesign,byusingDSP,acomplexarithmeticoperationiscompletedtomeettheneedsofclosedloopcontrolofFOGwithinashorttime.AllkindsofcontrolsignalsareproducedeasilybyFPGA,underwhichDSPcouldworkproperly.CombiningtheDSPandFPGA,thedetectingmethodisimplementedsuccessfully.Intheend,theresultoftestandperformanceisgiven.FromtheresultwecanconcludethattheprecisionofFOGisimprovedandthenoisesarelimitedtoalowlevel.

  • 标签: 光纤光学陀螺仪 信号探测 相位调制 DSP FPGA 船舶导航设备
  • 简介:Thenon-minimumphasefeatureoftail-controlledmissileairframesisanalyzed.Threeselectionstrategiesfordesiredperformanceindexesarepresented.Anaccelerationautopilotdesignmethodologybasedonoutputfeedbackandoptimizationisproposed.Performanceandrobustnesscomparisonsbetweenthetwo-loopandclassicalthree-looptopologiesaremade.Attemptstoimprovetheclassicalthree-looptopologyarediscussed.Despitethesameopen-loopstructure,theclassicalthree-loopautopilotshowsdistinctcharacteristicsfromatwo-loopautopilotwithPIcompensator.Boththetwo-loopandthree-looptopologiescanstabilizeastaticunstablemissile.However,thefiniteactuatorresourceisthecrucialfactordominatingautopilotfunction.

  • 标签: 导弹 自动驾驶仪 系统工程 系统理论
  • 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

  • 标签: 闭环水系统 稳定性 流动偏差 直接回归系统 倒转回归系统