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简介：Lawofthepropagationoferrorscausedbytheinconsistencyoftheboundaryscalesimilitudeinrivermodelexperimentispresentedinthispaper.Thefluctuationofscaletransfersalongthecharacteristicline,ifthedischargeandsedimentatentranceandthewaterlevelatthetailgatedrift.Thefluctuationofscalepropagateswiththederivedscalefunctionduetotopographicdeviation.Allerrorswillaccumulatetothefinalmeasureddata

简介：Tubehydroformingtechnologyhasshowntheattentionoftheautomotiveindustryduetoitsadvantagesoverconventionalstampingandweldingmethods.Inthisstudy,thetubehydroformingprocessincludingtubebending,preformingandhydroformingprocessforanautomobilesubframeisanalyzedanddesignedbythesimulationsoftwareAutoFormofafiniteelementmethod(FEM)program.Aparametricstudyiscarriedouttoobtaintheeffectoftheformingparameterssuchasinitialtubesizeandloadingpathonthe...

简介：TheARGO-YBJexperimentispresentlyunderconstructionattheYangbaijinghighAltitudeComsmicRayLaboratory(4300ma.s.l).90KmNorthtoLhasa(Tibet,peolpl'sRepublicofChina)ARGO-YBJwillstudyfundamentalissuesincosmicrayandastroparticlephysicsbydetectingsmallsizeairshowers.Thedetectorcovers-71×74squaremeterswithasinglelayerofresistivePlateCounters(RPCs),surroundedbyaguardringpartiallyinstrumented.Anevent-drivendatacollectionschemeisimplementedbyusingacustombusprotocol./Keyfeaturesofthisarchitectureareblock-orienteddatatransferandread-outcycleslabeledbytriggernumber,HardwareenginesinbothmasterandDAQboardshandlebustransactionsandprovideeventbuilingcapability,achievingreal-timedataprocessingwithnosoftwareoverhead.InthispaperwepresentthehardwaredesignoftheARGOexperiment'sDAQwhichbenefitsfromtheflexiblearchitectureofin-systemreconfigurableFPGAs.Thedataacquistitionboardsspecificallydevelopedforthisapplicationwillbedescribed.

简介：Anewretrofittingmethodisproposedhereinforreinforcedconcrete(RC)structuresthroughattachmentofanexternalstructure.Theexternalstructureconsistsofafiberconcreteencasedsteelframe,connectionslabandtransversebeams.Theexternalstructureisconnectedtotheexistingstructurethroughaconnectionslabandtransversebeams.Pseudostaticexperimentswerecarriedoutononeunretrofittedspecimenandthreeretrofittedframespecimens.Thecharacteristics,includingfailuremode,crackpattern,hysteresisloopsbehavior,relationshipofstrainanddisplacementoftheconcreteslab,aredemonstrated.Theresultsshowthattheloadcarryingcapacityisobviouslyincreased,andtheextensionlengthoftheslabandthenumberofcolumnswithintheexternalframeareimportantinfluencefactorsontheworkingperformanceoftheexistingstructure.Inaddition,thedisplacementdifferencebetweentheexistingstructureandtheouterstructurewascausedmainlybythreefactors:sheardeformationoftheslab,extractionoftransversebeams,anddriftoftheconjunctionpartbetweentheslabandtheexistingframe.Furthermore,thetotaldeformationdeterminedbythefirsttwofactorsaccountedforapproximately80%ofthedamage,thereforethesefactorsshouldbecarefullyconsideredinengineeringpracticetoenhancetheeffectsofthisnewretrofittingmethod.

简介：Mooringmodelexperimentandmooringlinetensiondeterminationareofsignificancetothedesignofmooringsystemsandberthingstructures.Thispapermainlyinvolves:(a)descriptionandanalysisofamooringmodelexperiment;(b)derivationofstaticequilibriumequationsforamooredshipsubjectedtowind,currentandwaves;(c)solutionofmo.oringequationswiththeMonteCarlomethod;(d)qualitativeanalysisofeffectsofpierpilesonmooringlineforces.Specialemphasisisplacedonthederivationofstaticequilibriumequations,solutionmethodandthemooringmodelexperiment.

简介：在常规天线摄影测量学，高精确的摄影测量的点决心被aerotriangulation总是用因为天线相片的外面的取向参数是未知的，控制在周界附近并且在块区域的中心削尖的很多地面执行。自从Navstar，在摄影测量学的一条工艺的革命发生了全球放系统(GPS)被使用决定暴露的3D坐标在相片飞行使命期间驻扎位置。支持GPS的aerotriangulation被联合的捆调整为摄影测量的观察和照相机取向数据进行。在这种情况中，必要地面控制点被GPS坚定的照相机位置代替。最近的调查证明这个方法正在来到实践。自从1990，我们在这个领域里从事了理论研究，软件开发，和相关实验和生产。到目前为止，丰富的研究成就以理论和应用程序被获得。在这篇论文，我们首先从在照相机和在空中的GPS天线之间的几何学导出支持GPS的aerotriangulation的数学模型，然后简短描述软件包裹WuCAPS(武汉联合了调整程序系统)由作者最新发展了，它为摄影测量、非摄影测量的观察服务联合的捆调整的目的。在现在的工作的结束，一套实际天线拍摄，在1鈭?的图象规模4000与从Tianjing地点拿的在空中的GPS数据，中国被WuCAPS处理。实验结果证实了有4XYZ地面的联合的捆调整的精确性在块区域的角落附近控制点离有3个另外的参数的常规捆调整的很靠近，那导致还原剂88%领域调查和75%生产费用，并且能遇见没有地面控制的由支持GPS的aerotriangulation的在小或中等的规模的地志的印射的说明。这显示出宽大的适用性和运动学的GPS亲戚在高精确的摄影测量的点决心放的经济利益。

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简介：ThisarticledescribesthefabricationofasuiteoflasertargetsbytheTargetFabricationgroupintheCentralLaserFacility(CLF),STFCRutherfordAppletonLaboratoryforthefirstacademic-accessexperimentontheOrionlaserfacility(Hoppsetal.,Appl.Opt.52,3597–3601(2013))atAtomicWeaponsEstablishment(AWE).Thisexperiment,partofthePOLARproject(Falizeetal.,Astrophys.SpaceSci.336,81–85(2011);Busschaertetal.,NewJ.Phys.15,035020(2013)),studiedconditionsrelevanttotheradiation-hydrodynamicprocessesoccurringinaremarkableclassofastrophysicalstarsystemsknownasmagneticcataclysmicvariables.Alargenumberofcomplexfabricationtechnologiesandresearchanddevelopmentactivitieswererequiredtofieldatotalof80high-specificationtargets.Targetdesignandfabricationproceduresaredescribedandinitialalignmentandcharacterizationdataarediscussed.

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简介：SNDisasphericalnon-magneticdetector,whichoperatedsince1996atVEPP-2Melectron-positroncolliderinNovosibirsk.NowVEPP-2McolliderisdismantledtobereplacedbyanewVEPP-2000machinewithhigherenergyandluminosity.TheSNDdetectorisalsoperformingupgradeofitssubsystemsincludingelectronics,andsoftware,ExpectedsubstantialgrowthofeventsdataflowrequiresradicalchangesintheDataAcquisition(DAQ)systemsoftware.ThispaperdescribestheSND2000softwarearchitecrureanditsprincipalcomponents.Firstthemaineventsflowprocessuingcomponentsareconsidered-thereadoutprocessandtheL3-triggerfarm.AfterprocessingbyL3theeventsflowiseitherloggedtotapeorfedtocalibrationandslowcontrolprocess.Usingauxiliarycontrolandservicesoftwarecomponents,whicharealsodescribed.performsthemanagementoftheseactivities.

简介：Sprayingtestwereconductedtwicebeforesteelslabswereputintothefurnaceandtheeffectsoftheoxidationresistancecoatingwereinvestigatedandverified.Bycomparingthechangeofslabweight,rollingforceoftheroughingmill&finishingmill,thicknessofoxidefilmonthesurfaceslabsbyanXL-30SEMandacidpicklingspeedofslabswithandwithoutcoating,itwasfoundthattheoxidizationwasteinthefurnacedecreasedby40percentwiththeuseofthecoatingandthecorrespondingyieldcapacitycouldincreaseby0.2percentatleast.Besides,thethicknessofoxidescalefilmonhotrolledproductswasreducedby1.44micrometersandtheacidpicklingtimewasshortenedby6swiththecoatingtechnology,whilethetotalrollingforceofRM&FMdidnotchanged.Furthermore,theapplicationprospectofthistechnologywasalsodiscussedinthispaper.

简介：TheneuralnetworkrealtimeeventselectionfortheDIRACewperimentatCERNispresented.Itcomprisesoftwoindependentparts.OneusesplasticscintillatorsandtheothertheverticalScintillatingFibres,Theglobaleventdecisionistakeninlessthan250ns.Signaleventsareselectedwithanefficiencyosmorethan0.99withabackgroundratereductionofabout2.

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简介：ＤＲＡＦＴＰＲＯＰＯＳＡＬＦＯＲＴＨＥＳＯＵＴＨＣＨＩＮＡＳＥＡＭＯＮＳＯＯＮＥＸＰＥＲＩＭＥＮＴ（ＳＣＳＭＥＸ）ＣｈｅｎＬｏｎｇｘｕｎ（陈隆勋）ＤＲＡＦＴＰＲＯＰＯＳＡＬＦＯＲＴＨＥＳＯＵＴＨＣＨＩＮＡＳＥＡＭＯＮＳＯＯＮＥＸＰＥＲＩＭＥＮＴ（ＳＣ...

简介：TheFermilabCKM(E921)experimentstudiesararekaondecaywhichhasaverysmallbranchingratioandcanbeveryhardtoseparatefrombackgroundprocesses.AtriggerandDAQsystemisrequiredtocollectoallnecessaryunformationforbackgroundrejectionandtomaintainhighreliabilityathighbeamrate.Theuniquechallengeshaveemphasizedthefollowingguidingconcepts:(1)Collectingbackgroundisasimportantascollectinggoodevents.(2)ADAQ"event"shouldnotbejusta"snapshot"ofthedetector.Itshouldbeashorthistoryrecordofthedetectoraroundthecandidateevent.Thehithistoryprovidesinformationtounderstandtemporarydetectorblindness,whichisextremelyimportanttotheCKMexperiment.(3)Themainpurposeofthetriggersystemshouldnotbe"knockingdowntriggerrate"or"throwingoutgarbageevents".Instead,itshouldclassifytheeventsandselectappropriatedatacollectingstraegiesamongvariouspredefinedonesforthegiventypesoftheevents.Thefollowingmethodologiesareepmployedinthearchitecturetofulfilltheexperimentrequirementswithoutconfrontingunnecessarytechnicaldifficulties.(1)Continuousdigitizationnearthedetectorelementsisutilizedtopreservethedataquality.(2)Theconceptofminimumsynchronizationisadoptedtoeliminatetheneedsoftimematchingsignalpaths.(3)Agloballevel1triggerperformscoincidentandvetofunctionsusingdigitaltiminginformationtoavoidproblemsduetosignaldegradinginlongcalbes.(4)TheDAQlogicallowstocollectchroniclerecordsaroundtheinterestingeventswithdifferentlevelsofdetailofADCinformation,sothatverylowenergyparticlesinthevetosystemscanbebestdetected.(5)Are-programmablehardwaretrigger(L2.5)andasoftwaretrigger(L3)sittingintheDAQstreamareplannedtoperformdataselectionfunctioinsbasedonfulldetectordatawithadjustability.

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