简介：Inordertofacetheexpectedincreaseinstatisticsbetweennowand2005,theBabarexperimentatSLACisevolvingitscomputingmodeltowardadistributedmultitiersystem.ItisforeseenthatdatawillbespreadamongTier-AcentersanddeletedfromtheSLACcenter,Aunifromcomputingenvirommentisbeingdeployedinthecenters,thenetworkbandwidthiscontinuouslyincreasedanddatadistributiontoolshasbeendesignedinordertoreachatransferrateof-100TBofdataperyear,Inparallel,smallerTier-BandCsitesreceivesubsetsofdata,presentlyinKanga-Root[1]formatandlaterinObjectivity[2]format,GRIDtoolswillbeusedforremotejobsubmission.

简介：在有低极化模式的40个Gb/s系统分散(PMD)纤维，一阶的PMD是有相当小的价值的dominate因素。由一个电的极化控制器(PC)组成的一个适应PMD赔偿者，维持纤维(PMF)的极化的节，极化(DOP)的度察觉者和一个反馈控制模块在40Gb/sNSFCNet被采用。这个赔偿者有简单结构和高速度，它能适应地补偿一阶的PMD直到20ps，平均寻找时间是2ms。CLC数字TN929.11

简介：Inthispaper,wederivethebrightanddarkphotonnumberstatesforspatialinterferenceoftwoormorelightbeamsandsucceedintheexplanationofYoung'sinterferenceexperiment,andalsoachieveabettercomprehensionofthewellknowncommentofDirac"eachphotononlyinterferenceswithitself".Fromthefullyquantumpointofview,theoriginoftheinterferencefringesconsistsinthemodetransformationandthedetectionofdouble-slitstates.

简介：Theoptimizationdesignofthepowersystemisessentialforstratosphericairshipswithparadoxicalrequirementsofhighreliabilityandlowweight.Themethodologyoforthogonalexperimentispresentedtodealwiththeproblemoftheoptimizationdesignoftheairship’spowersystem.Mathematicalmodelsofthesolararray,regenerativefuelcell,andpowermanagementsubsystem(PMS)arepresented.Thebasictheoryofthemethodoforthogonalexperimentisdiscussed,andtheselectionoffactorsandlevelsoftheexperimentandthechoiceoftheevaluationfunctionarealsorevealed.TheproposedmethodologyisvalidatedintheoptimizationdesignofthepowersystemoftheZhiYuan-2stratosphericairship.Resultsshowthattheoptimalconfigurationiseasilyobtainedthroughthismethodology.Furthermore,theoptimalconfigurationandthreesub-optimalconfigurationsareintheParetofrontierofthedesignspace.Sensitivityanalysesfortheweightandreliabilityoftheairship’spowersystemarepresented.

简介：Anexperimentofadaptivepolarizationmodedispersion(PMD)compensationfor40-Gb/sreturn-to-zero(RZ)opticalcommunicationsystemisreported.Intheexperiment,degreeofpolarization(DOP)isusedasfeedbacksignalandparticleswarmoptimization(PSO)methodisadoptedaslogiccontrolalgorithm.Thecompensationtimeisabout200ms,thecompensateddifferentialgroupdelay(DGD)isupto30ps,andbiterrorrate(BER)of10^-9isreachedwhenPMDcompensationisemployed.

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简介：Supposetherearetwoelectricitytesters,AandB(FigureA).AndametalcylinderCwhichisalmostclosed(calledFaradayCylinder)isfixedtotesterB,makingbothtesterBandcylinderCcharged.Asaresult,thealuminiumfoilontesterBopens.

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简介：Inrecentyears,pulsemagneticstimulationtechniquehasbeenpaidmoreandmoreattentionbythepeopleengagedinnoninvasivediagnosisandtherapywork.Comparedwithelectricstimulation,ithastheadvantagesofbeingnoninvasive,pain-lessandsafe,andhasbeenusedtoexamineandtreatdisordersofnervesystemsuc-cessfully.Applicationinotherfieldsisstillachallengetomanyresearchers.Wehave

简介：ThemaingoaloftheHyperCP(E87)experimentatFermilabistosearchforCPviolationinΞandΑdecaysatthe-10^-4level.Thislevelofprecisiondictatesadatasampleofoverabillionevents.Theexperimentcollectedabout231billionraweventsonabout30,0005-GBtapesintenmonthsofrunningin1997and1999,Inordertoanalyzethishugeamountofdata,thecollaborationhasreconstructedtheeventsonafarmof55dual-processorLinux-basedPCsatFermilab.AsetoffarmtoolshasbeenwrittenbythecollaborationtointerfacewiththeFarmBatchSystem(FBSandFBSNG)[1]developedbytheFermilabComputingDivision,toautomatemuchofthefarmingandtoallownonexpertfarmshifterstosubmitandmonitorjobsthroughaweb-basedinterface.Specialcarehasbeentakentoproducearobustsystemwhichfacilitateseasyrecoveryfromerrors.Thecodehasprovisionsforextensivemonitoringofthedataonaspill-by-spillbasis,asisrequiredbytheneedtominimizepotentialSystematicerrors.About36millionplotsofvariousparametersproducedfromthefarmanalysiscanbeaccessedthroughadatamanagementsystem.Theentiredatasetwasfarmedinelevenmouths,oraboutthesametimethatwastakentoacquirethedata.Wewilldescribethearchitectureofthefarm.ourexperienceinoperatingit,andshowsomeresultsfromthefarmanalysis.

简介：Themaingoalofdivertorphysicsistodeterminetheedgeplasmatemperature,density,powerdispersal,powerasymmetrybetweeninwardtargetandoutwardone,thecontrolabilityofimpurityandneutralparticles.Aboveparameterswillchangewithplasmadensityorheatingpower.Theycanbedividedinto3regimes:linearregime,highrecyclingoneanddetachedone.

简介：一个小小的乒乓球被人们放到了世界上最长的河流——尼罗河的源头，开始了它的征程。也许这个实验不会对人们的生活有所改变。可是它却从另一方面证明了一些东西。是什么呢？

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简介：BasedontheGlobalRegionalAssimilationandPredictionSystem-TropicalCycloneModel(GRAPES-TCM),anensembleforecastexperimentwasperformed,inwhichTyphoonWiphaduringtheperiodimmediatelypriortolandfallwasselectedforthestudyandthebreedingofgrowingmode(BGM)methodwasusedtoperturbtheinitialconditionsofthevortexfieldandtheenvironmentfield.TheresultsoftheexperimentindicatethateachmemberhadadifferentinitialstatusinBGMprocessingandtheyshowareasonablespreadamongmembersalongwiththeforecastphase.Changesinthelarge-scalefield,thermodynamicstructure,andspreadamongmemberstookplacewhenWiphamadelandfall.Thesteeringeffectofthelarge-scalefieldandtheinteractionbetweenthethermodynamicsandthedynamicsresultedindifferenttracksofthemembers.Meanwhile,theforecastuncertaintyincreased.Insummary,theensemblemeandidnotperformaswellasthecontrolforecast,buttheclustermeanprovidedsomeusefulinformation,andperformedbetterthanthecontrolinsomeinstances.Thepositionerrorwas34kmfor24hforecast,153kmfor48hforecast,and191kmfor66hforecast.Thestrikeprobabilitychartqualitativelydescribedtheforecastuncertainty.

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简介：TheAlphaMagneticSpectrometer(AMS)isanexperimenttosearchinspacefordarkmatter,missingmatterandantimatterscheduledforinstallationontheInternationalSPaceStation(ISS)Alpha.AMSdetectorhadprecursiveflightinJune1998onboardthespaceshuttleDiscoveryduringSTS91,Morethan100Meventsbeencollectedandanalyzed.Thedetectorwillhaveanotherflightinthefallofyear2003formorethanthreeyearsonISS.ThedatawillbetransmittedfromISStoNASAMarshallSpaceFlightCenter(Huntsvile,Alabama)andthentoMITandCERNforprocessingandanalysis,InthisreportwedescribeAMSsoftwareinparticularconditionsdatabaseanddataprocessingsoftware.

简介：Inadditiontoforwardundulatoryswimming,Gymnarchusniloticuscanswimviaundulationsofthedorsalfinwhilethebodyaxisremainsstraight;furthermore,itswimsforwardandbackwardinasimilarway,whichindicatesthattheundulationofthedorsalfincansimultaneouslyprovidebidirectionalpropulsiveandmaneuveringforceswiththehelpofthetailfin.Ahigh-resolutionCharge-CoupledDevice(CCD)imagingcamerasystemisusedtorecordkinematicsofsteadyswimmingaswellasmaneuveringinG.niloticus.Basedonexperimentaldata,thispaperdiscussesthekinematics(cruisingspeed,wavespeed,cyclefrequency,amplitude,lateraldisplacement)offorwardaswellasbackwardswimmingandmaneuvering.Duringforwardswimming,thepropulsiveforceisgeneratedmainlybyundulationsofthedorsalfinwhilethebodyaxisremainsstraight.Thekinematicparameters(wavespeed,wavelength,cyclefrequency,amplitude)havestatisticallysignificantcorrelationswithcruisingspeed.Inaddition,theyawattheheadisminimalduringsteadyswimming.Fromexperimentaldata,themaximallateraldisplacementofheadisnotmorethan1%ofthebodylength,whilethemaximallateraldisplacementofthewholebodyisnotmorethan5%ofthebodylength.AnotherimportantfeatureisthatG.niloticusswimsbackwardsusinganundulatorymechanismthatresemblestheforwardundulatoryswimmingmechanism.Inbackwardswimming,theincreaseoflateraldisplacementoftheheadiscomparativelysignificant;theamplitudeprofilesofthepropulsivewavealongthedorsalfinaresignificantlydifferentfromthoseinforwardswimming.WhenG.niloticusdoesfastmaneuvering,itsbodyisfirstbentintoeitheraCshapeoranSshape,thenitisrapidlyunwoundinatravellingwavefashion.Itrarelymaneuverswithoutthehelpofthetailfinandbodybending.

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