简介:Ahybridmodelisusedtosimulatethecharacteristicsofacollisionalsheathinacapacitivelycoupledplasma(CCP)drivenbyadualfrequencysourceincludingaRFandapulsedcurrentsourceappliedtothesameelectrode.Thehybridmodelincludesafluidmodelusedtosimulatethecharacteristicsofthecollisionalsheath,andaMonte-Carlo(MC)methodtoobtainbothionenergyandionangulardistributions(IEDsandIADs)impingingonthesubstrate.Theeffectsofthelowfrequencyofthepulsedsourceandthegaspressureonthecharacteristicsofthesheath,aswellastheIEDsandIADs,arestudied.Theresultsshowthattheratioofpulse/RFfrequencyandthegaspressurearecrucialforthecharacteristicsofthesheathandtheIEDs.TheIADsaresignificantlymoresensitivetothegaspressure.
简介:ThelowresistancePTCceramicthermistormaterialwithexcellenteleectricalpropertiesaresuccessfullyfabricatedbyrawmaterialsatindustrialrangemadeinourcountryonthestudyofitscompositionexpressionandfabricationprocessbyusingtheadditionofNb,La,Y,Ta,microstructureregulatorBNandASTLphase.Thecompositionanditsfabricationmethodarestudied.TherelationofelectricalpropertiesofthePTCceramicmaterialtoitscompositionexpressionanditsrelatedelectricalpropertiesarediscussed.
简介:Thedeterminationofthesoundpowerofasourceissimpleinareverberationchamber,butusuallylowervalvesareobtainedatlowfrequenciesthanthefree-spacevalue.Itisshownthatthesoundpowerdeterminedinareverberationchamberdependsnotonlyonitsfree-spacepower,butalsoonthepositionsofthesourceandthereveiver,aswellasthewaythemeasurementsaremadeandaveraged.Exactandstatisticalformulasarederivedtoaccountforthesefactors.Theresultsexplainthediscrepancyandagreewellwithearlierexperiments.Basedonthetheory,parcticabletechniquesofsoundpowerdetermina-tionarepropesedandcorrectpowerformulaspresented.
简介:Strainageinginsteelwasfirstobservedduringthe19thcenturywhenthemaximumloadcarryingcapacityofatestpiecewasincreasedafterithadbeenretestedfollowingapreviousseriesoftestinginaplasticrange.Overthelastdecades,agreatdealofresearchhasbeenperformedtogaindeeperinsightsintothephenomenonofstrainageing.Thesynergisticdevelopmentoftheoreticalhypothesisandnewexperimentalevidenceshaspromotedtheunderstandingofthemechanismsunderlyingstrainageing.Thecontentofthispaperisorganizedintofourcomponents.First,wehavecomparedthemaintheoriesdevelopedinrecentyears.Second,wehavesummarizedthemetallurgicaleffectsonthestrainageingbehaviorobservedinexperiments.Moreover,wehavemadeanattempttocorrelatetheexperimentalresultsandtheabove-mentionedtheories.Third,wehaveproposedafeasiblesolutiontocontrolstrainageinginlowcarbonsteels.Finally,wehaveelaboratedthepotentialityoftheatomprobetechniqueinfacilitatingdirectcharacterizationofthedistributionofsoluteatoms.
简介:Theharmonicanalysismethodbasedonhighandlowwaterlevelsisdiscussedinthispaper.Inordertomakefulluseoftheinformationofhighandlowwaterobservations(thetimederivativeofwaterlevelattheobservationtimeiszero),theweightcoefficient,w,isintroducedtocontroltheimportanceofthepartrelatedtothisinformationintheerrorformula.Themajordiurnalconstituents,O1andK1,andsemi-diurnalconstituents,N2,M2andS2areselecteddirectlyfromthemonthlydataanalysis,andsomeotherimportantconstituents,P1,v2andK2,areincludedastheinferredconstituents.Theobtainedharmonicconstantsofthemajorconstituentsareveryclosetothoseobtainedfromtheanalysisofhourlydata,andthisshowsthathighandlowwaterdatacanbeusedtoextracttidalconstantswithhighaccuracy.Theanalysisresultalsoshowsthattheinferenceandtheweightingcoefficientareimportantinthehighandlowwaterdataanalysis,anditissuggestedthatw≥1shouldbetakeninmonthlyhighandlowwaterdataanalysis.Thisanalysismethodcanbeuseddirectlytoanalyzealtimetricdatawithw=0.
简介:在这份报纸,我们显示出怎么为图象结束在常规或在常规附近的质地利用低等级、稀少的结构。我们的方法为随机、连续的贪污基于统一明确的表达。除了质地的低等级性质,算法也使用自然图象的稀少的假设:因为自然图象是piecewise,变光滑,它在某些转变领域是稀少的(例如Fourier或小浪变换)。我们联合低等级并且质地的稀少性质在建议算法一起想象。我们的算法能自动地并且正确地基于凸的优化修理一块贿赂质地的全球结构,甚至没有要完成的区域的精确信息。这个算法集成质地校正并且修理进一个优化问题。通过广泛的模拟,我们证明我们的方法能完成并且修理错误比存在低等级的矩阵恢复方法更好与随机、连续的支持贿赂的质地。我们的方法证明超越本地补丁的重要优点在处理大贪污,不一致的质地,和大观点变丑基于质地合成技术。
简介:·AIM:Toevaluateandcompareaspherictoricintraocularlens(IOL)implantationandasphericmonofocalIOLimplantationwithlimbalrelaxingincisions(LRI)tomanagelowcornealastigmatism(1.0-2.0D)incataractsurgery.·METHODS:Aprospectiverandomizedcomparativeclinicalstudywasperformed.Therewererandomlyrecruited102eyes(102patients)withcataractsassociatedwithcornealastigmatismanddividedintotwogroups.ThefirstgroupreceivedtoricIOLimplantationandthesecondonemonofocalIOLimplantationwithperipheralcornealrelaxingincisions.Outcomesconsideredwere:visualacuity,postoperativeresidualastigmatism,endothelialcellcount,theneedforspectacles,andpatientsatisfaction.Todeterminethepostoperativetoricaxis,allpatientswhounderwentthetoricIOLimplantationwerefurtherevaluatedusinganOPDScanIII(NidekCo,Japan).Follow-uplasted6mo.·RESULTS:Themeanuncorrecteddistancevisualacuity(UCVA)andthebestcorrectedvisualacuity(BCVA)demonstratedstatisticallysignificantimprovementaftersurgeryinbothgroups.Attheendofthefollow-uptheUCVAwasstatisticallybetterinthepatientswithtoricIOLimplantscomparedtothosepatientswhounderwentimplantationofmonofocalIOLplusLRI.Themeanresidualrefractiveastigmatismwasof0.4DforthetoricIOLgroupand1.1DfortheLRIgroup(P<0.01).Nodifferencewasobservedinthepostoperativeendothelialcellcountbetweenthetwogroups.·CONCLUSION:Thetwosurgicalproceduresdemonstratedasignificantdecreaseinrefractiveastigmatism.ToricIOLimplantationwasmoreeffectiveandpredictablecomparedtothelimbalrelaxingincision.
简介:Thereisatypeofnodalsurfaceimposedbysymmetryonwavefunctions.Thesesurfacesarecrucialtotheorderingoflow-lyingstates.Basedonananalysisofthistypeofsurfaceandbasedonexistingtheoreticalresults,thefeatureofthelow-lyingspectrumoftheHe-tetramerisstudied,andthecandidatesofboundstatesandnarrowresonancesaresuggested.
简介:Octave-spanningfrequencycombgenerationinmicroresonatorsispromising,butstrongspectrallossescausedbymaterialabsorptionandmodecouplingbetweentwopolarizationsormodefamiliescanbedetrimental.Weexaminetheimpactofthespectrallossandproposerobustcombgenerationwithalossofeven300dB/cm.CavitynonlineardynamicsshowthataphasechangeassociatedwithspectrallossescanfacilitatephasematchingandKerrcombgeneration.Giventhisuniquecapability,weproposeanovelarchitectureofon-chipspectroscopysystems.
简介:Thephaseandfrequencylockingofmicrowave,millimeterwavepowercombiningwereanalysedandsummarizedinanall-roundway.Themaster/slavephaselockingofcavityoscillators,thepeerphaselockingofmutuallycoupledoscillators,andthepeerphaselockingofring-connectedmultipleoscillatorswereinvestigated.Theresultsofnumericalcalculations,andtherelationsofphasetophaselockingmodelandoscillatorparametersweregiven.Andthecavityandspacepowercombiningaspectsformicrowaveandmillimeterwavewerepresented.
简介:Itisidentifiedthatbarelypassingelectronsarethedriveofthee-Gshbones,ratherthanthebarelytrappedelectronsatlowfrequency.Thefrequencyjumpine-Bshboneexperimentsisreproducedandanalyzed.Itisfoundthatthee-Bshbonefrequencyincreaseswiththehotelectronenergy,whichisconsistentwiththeexperiments.Thegrowthrateofthemode(m=2,n=2)isgreaterthanthatofthemode(m=1,n=1).
简介:Themethodformeasuringthestrainofanobjectusinganopticalfiberandafrequencymodulation(FM)coupledcaritysemiconductorlaserispro-posed.ThismethodusesthecoherentFMheterodyneprincipleoftheMichelsonin-terferometerandcanavoidtheπ/2nonreciprocalphasebiasandphaseshiftingproblemexistingingeneralfiberopticinterferentialsensors,themaximumdetec-tionrangeislimitedbythecoherentlengthofthesemiconductorlaseranditsrela-tivefactor.