简介：1．大肥猪的质量约为150kg，其体重约为________N，相一当于__________个质量为25kg的狗的体重．

简介：1．河水总是向低处流，抛出的物体总会落向地面，这些现象说明，地球上的物体总是要受到________力的作用，该力的施力物体是______。

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简介：通过对当前用于海洋重力场格网插值的四种常用算法（距离倒数加权法、Kriging法、径向基函数法和改进的二次曲面Shepard方法）进行分析,以相对规则、不同密度的两组数据作为基准数据进行了插值比较。实验结果表明,基于改进的Shepard插值算法相对于其它三种算法具有速度快、精度高的优点,比较符合当前海洋重力数据获取的现状,是进行高精度重力图生成的有效方法。

简介：TheLHCexperimentsatCERNwillgeneratehugevolumesofdata-severalPBperyearatdataratesbetween100MB/sand1.5GB/s.Thestorageandanalysisofthesedatapresentamajorchallenge.IncollaborationwithothermembersoftheformerRD45project,thecentraldatabasesupportgroupatCERNhasbeenworkingonthisissueforseveralyears,leadingtoproductionuseofapotentialsolution,basedonthecombinationofanObjectDatabaseandMassStoragesystem,botheatCERNandoutside.

简介：Thefastturnoverofsoftwaretechnologies,inparticularinthedomainofinteractivity(coveringuserinterfaceandvisualisation)makesitdifficultforasmallgroupofpeopletoproducecompleteandpolishedsoftware-toolsbeforetheunderlyingtechnologiesmakethemobsolete.AttheHepVis'99workshop,aworkinggrouphasbeenformedtoimprovetherpoductionofsoftwaretoolsfordataanalysisinHENP.Besidepromotingadistributeddevelopmentorganisation,onegoalofthegroupistosystematicallydesignasetofabstractinterfacesbasedonusingmodernOOanalysisandOOdesigntechniques.Aninitialdomainanalysishascomeupwithseveralcategories(componets)foundintypicaldataanalysistools:historams,Ntuples,Functions,Vectors,Fitter,Plotter,AnalyzerandController,SpecialEmphasiswasputonreducingthecouplingsbetweenthecategoriestoaminimum,thusoptimisingre-useandmaintainabilityofanycomponentindividually.TheinterfaceshavebeendefinedinJavaandC++andimplementationsexistintheformoflibrariesandtoolsusingC++(Anaphe/Lizard,Openscientist)andJava(JavaAnalysisStudio),AspecialimplementationaimsataccessingtheJavaLiraries(throughtheirAbstractInterfaces)fromC++.ThispapergiveranoverviewofthearchitectureanddesignofthevariouscomponentsfordataanalysisasdiscussedinAIDA.

简介：Since1998,theALICEexperimentandtheCERN/ITdivisionhavejointlyexecutedseverallarge-scalehighthroughputdistributedcomputingexercises:theALICEdatachallenges.ThegoalsoftheseregularexercisesaretotesthardwareandsoftwarecomponentsofthedataacqusitionandcomputingsystemsinrealisticconditionsandtoexecuteanearlyintegrationoftheoverallALICEcomputinginfrastructure.ThispaperreportsonthethirdALICEDataChallenge(ADCIII)thathasbeenperformedatCERNfromJanuarytoMarch2001.ThedatausedduringtheADCⅢaresimulatedphysicsrawdataoftheALICETPC,producedwiththeALICEsimulationprogramAliRoot.ThedataacquisitionwasbasedontheALICEonlineframeworkcalledtheALICEDataAcquisitionTestEnvironment(DATE)system.Thedataaftereventbuilding,werethenformattedwiththeROOTI/OpackageandadatacataloguebasedonMySQlwasestablished.TheMassStorageSystemusedduringADCIIIisCASTOR.Differentsoftwaretoolshavebeenusedtomonitortheperformances,DATEhasdemonstratedperformancesofmorethan500MByte/s.Anaggregatedatathroughputof85MByte/swassutainedinCASTORoverseveraldays.Thetotalcollecteddataamountsto100TBytesin100.00files.

简介：为学习微积分的读者介绍如何将基本流体力学应用于对发展中国家非常重要的简单重力输水系统的建模。首先推导出Bernoulli方程,从而了解作为沿流线运动的流体质点压力、速度和高度之间的关系。其次,应用Bernoulli方程分析一个简单的输水系统的合力和流速。然后,对层流和湍流分别考虑分压水箱、不同直径的管道及摩擦的影响。最后,讨论在密克罗尼西亚和洪都拉斯重力输水系统的设计和安装。

简介：Inthispaperwepresentanoverviewoftheongoingstudiestobuildupaframeworkthatsupportstheanalysisafterthereprocessingphase.ThisframeworkaimstodevelopastandarddataquerylanguagefortheHEPcommunity,Therelatedstudieshavebeenconsideringtherelationaldatabasemodelaspossibleapproachopposedtotheobjectmodel.SeveraloptimizingandtunningtechniquesarebeingusedintechnologieslikeDB2[3],Oracle[5]andRoot[2],thataresimultaneouslybeingevaluated.TheexperienceobtainedcanbeseenasavaluabletestbedforthefutureLHCandsimultaneouslyasinterestinginputforthedevelopmentoftheGRID.

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：时空单极方程是在到ℝ2,1的ℝ2,2的anti-self-dualYang工厂方程的减小。这个方程是一个非线性的波浪方程，并且能被编码为宽松的对。相等的宽松的对被奶妈和Terng使用与连续散布数据构造单极，然后方程能被散布数据线性化，允许一个使用散布方法解决有很快腐烂的Cauchy问题的逆小起始的数据。在这篇论文，我们使用holomorphic捆的术语和某些地图的transversality，由起始的数据的parametrized，多达计量转变给更起始的数据，我们能与使用散布方法解决单极方程的Cauchy问题。

简介：InthispaperwehighlightstrategiesandchoicesthatmaketheDφDataHandlingsystemmarkedlydifferentfrommanyotherexperiments'systems,WeemphasizehowfartheDφsystemhascomeininnovatingandimplementingaDφ-specificDataGridsystem.Wediscussexperiencesduringthefirstmonthsofdetectorcommissioningandgivesomefutureplansforthesystem.

简介：Semiparametrictransformationmodelsprovideaclassofflexiblemodelsforregressionanalysisoffailuretimedata.Severalauthorshavediscussedthemunderdifferentsituationswhencovariatesaretimeindependent(Chenetal.,2002;Chengetal.,1995;Fineetal.,1998).Inthispaper,weconsiderfittingthesemodelstoright-censoreddatawhencovariatesaretime-dependentlongitudinalvariablesand,furthermore,maysuffermeasurementerrors.Forestimation,weinvestigatethemaximumlikelihoodapproach,andanEMalgorithmisdeveloped.Simulationresultsshowthattheproposedmethodisappropriateforpracticalapplication,andanillustrativeexampleisprovided.

简介：AsaresultofdiscussionswithintheHEPcommunity,wehavewrittenaC++packagewhichcanbeusedtomaintainatableofparticleproperties,includingdecaymodeinformation.Theclassesallowformultipletablesandacceptinpufromanumberofstandardsources,Inaddition,Theyprovideamechanismbywhichaneventgeneratorcanemploythetabulatedinformationtoactuallydirectthedecayofparticles.

简介：Iterativealgorithmsforsolvingthedataassimilationproblemsareconsidered，basedonthemainandadjointequations.Spectralpropertiesofthecontroloperatorsoftheproblemarestudied,theiterativealgorithmsarejustified.

简介：ＵｐｇｒａｄｅｏｆＧｏｏｓｙＤａｔａＡｃｑｕｉｓｉｔｉｏｎＳｙｓｔｅｍ￥ＷａｎｇＳｈｕｊｉｎ；ＷａｎｇＹａｎｙｕ；ＸｉｎｇＪｉａｎｐｉｎｇ；ＧｕｏＴｉａｎｒｕｉａｎｄＪｉａｏＤｕｎｐａｎｇＡｄａｔａａｃｑｕｉｓｉｔｉｏｎｓｙｓｔｅｍｎａｍｅｄＧｏｏｓ...

简介：在自然、社会的科学的许多实际系统能被动态网络描述。一天一天地，我们测量了并且从这些网络积累了数据的巨大的数量，它能被我们使用推进我们世界的理解。生产这些数据的网络的结构经常是未知的。因而，从可得到的数据理解这些网络的结构转弯是学科交差的域里的中央问题之一，它被称为网络重建问题。在这份报纸，我们用数据可获得性不为常规网络重建是足够的部分可得到的数据和一些状况考虑了网络重建的问题。而且，我们建议与仅仅可得到的子网和隐藏的全部网络的另外的节点的数据推断子网；与一些可得到的节点变量的一般水准在网络描绘组组相互作用；并且网络被未知内部快变化的噪音和未知外部慢慢地变化的信号驾驶仅仅，与节点变量的已知的数据执行网络重建。所有这些状况被期望在实际系统和方法普通，结果可能为真实世界应用是有用的。

简介：TheBaBardataacquisitionsystem(DAQ)transportsdatafromthedetectorfrontendeletronicstoshorttermdiskstorage.Amonitoringapplication(VMON)hasbeendevelopedtomonitortheonehundredandninetycomputersinthedataflowsystem.PerformanceinformationforeachCPUiscollectedandmulticastacrosstheexistingdatatransportnetwork.ThepacketsarecurrentlycollectedbyasingleUNIXworkstationandarchived.AROOTbasedGUIprovidescontrolanddisplaystheDAQperformanceinrealtime.ThesameGUIisreusedtorecoverarchivedVMONdata,VMONhasbeendeployedandconstantlymonitorstheBaBardataflowsystem.Ithasbeenusedfordiagnosticsandprovidesinputtomodelsprojectingfutureperformance.Theapplicationhasnomeasurableimpactondatataking,respondsinstantaneouslyonthehumantimescaletorequestsforinformationdisplay,andusesonly3%ofa300MHzSunUltra5CPU.

简介：TheCDFexperimentstarteddatatakinginApril2001,Thedataareorganizedintodatasetswhichcontaineventsofsimilarphysicspropertiesandreconstructionversion.theinformationaboutdatasetsisstoredintheDataFileCatalog,arelationaldatabase.Thisinformationispresentedtothedataprocessingframeworkasobjectswhichareretrievedusingcompoundkeys.Theobjectsandthekeysaredesignedtobethealgorithms'viewofinformationstoredinthedatabase.ObjectsmayuseseveralDBtables.Adatabaseinterfacemanagementlayerexistsforthepurposeofmanagingthemappingofpersistentdatatotransientobjectsthatcanbeusedbytheframework.Thislayerexistsbetweenthealgorithmcodeandthecodewhichreadsdirectlyfromdatanbasetables.Attheuserend,itplacesget/putinterfaceonatopofatransientclassforretrievalorstorageofobjectsofthisclassusingakey.DataFileCatalogcodemakesuseofthisfacilityandcontainsallthecodeneededtomanipulateCDFDataFileCatalogfromaC++programorfromthecommandprompt,ItsupportsanOracleinterfaceusingOTL,andamSQLinterface,ThiscodeandtheOravcleimplementationofDataFileCatalogweresubjectedtotestduringCDFCommissioningRunlastfallandduringfirstweeksofRunIIinApril.Itperformedexceptionallywell.

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