学科分类
/ 10
193 个结果
  • 简介:Inthispaper,aneweffectivemethodisproposedtofindclassassociationrules(CAR),togetusefulclassassociationrules(UCAR)byremovingthespuriousclassassociationrules(SCAR),andtogenerateexceptionclassassociationrules(ECAR)foreachUCAR.CARmining,whichintegratesthetechniquesofclassificationandassociation,isofgreatinterestrecently.However,ithastwodrawbacks:oneisthatalargepartofCARsarespuriousandmaybemisleadingtousers;theotheristhatsomeimportantECARsaredifficulttofindusingtraditionaldataminingtechniques.Themethodintroducedinthispaperaimstogetovertheseflaws.Accordingtoourapproach,ausercanretrievecorrectinformationfromUCARsandknowtheinfluencefromdifferentconditionsbycheckingcorrespondingECARs.Experimentalresultsdemonstratetheeffectivenessofourproposedapproach.

  • 标签: 有效发现 程序设计 类联结规则
  • 简介:TheChinesegovernmentpaysspecialattentiontopromotingandensuringhumanrightsaccordingtolaw.In2001,theNPCstandingcommitteereviewed30bills,revisedthetrademarklaw,thecopyrightlaw,themarriagelawandthetradeunionlawandadoptedAmendmentⅢtothecriminallawinthelightofterroristactivities.Thejudgelawandtheprocuratoratorlawhavechangedthesystemfortheappointmentofjudgesandprocuratorsandforacquiringthequalificationsoflawyers.Therevisedlawsprovideforaunified

  • 标签:
  • 简介:转变地方法(TFM)被开发估计有任意的形状的水晶composites的各向异性的绝缘的性质和水晶包括的绝缘的性质,绝缘的轴与各向异性的水晶的那些其校长不同矩阵。包括形状引起的复杂边界值问题被介绍一个转变电场进水晶composites区域避免,并且有效各向异性的绝缘的回答以转变地被提出。而且,数字结果证明水晶composites的有效各向异性的绝缘的回答周期性地作为在包括和矩阵水晶材料的主要的绝缘的轴之间的旋转角度的功能变化。它被发现那更逍遥法外包括形状导致的包括体积部分有效各向异性的绝缘的回答上的深刻效果。

  • 标签: 各向异性晶体 介电性能 复合材料 各向异性介质 任意形状 反应介质
  • 简介:Nikuradseroughness(ks)isveryimportantinthesedimenttransportpredictionbecauseitisrelatedtotheevaluationsofthevelocitydistribution,shearstressanderosiondepth.DimensionlessNikuradseroughness(ks/D,whereDisthesedimentdiameter)isusuallygiven1–2.5ontheimmobileplanbedoratlowshearstress.ButitbehavesdifferentlyonthemobileplanbedathighshearstresswithmuchsedimentpickeduptomovementwhentheShieldsparameter(Θ)islargerthan0.8–1.0.TheeffectiveNikuradseroughnessonthemobileplanbedwasderivedindirectlyfromtheerosiondepthcorrelatedtothemobileplanbedthicknessconsideringthemassconservationinthepresentstudy.TheproposederosiondepthconfirmedtherelationtotheShieldsparameterswithanextrafactorconsistingofsuspendedsedimentanditsdampingtoturbulence.Thedecrementoftheerosiondepthcausedbytheincrementofthesedimentdiameteratlargeshearstresswasobtained,whichwasusuallyabsentinclassicalempiricalformulasbasedonthebedloadtheory.GoodagreementwithexperimentswasachievedbythepresentpredictionoftheNikuradseroughness,erosiondepthandsedimenttransportrate.Discussionwasmainlyfocusedonthepredictionimprovementcausedbyconsideringtheimpactofsuspendedsedimentanditsdampingtoturbulence.

  • 标签: MOBILE PLAN BED Nikuradse ROUGHNESS OSCILLATORY
  • 简介:Farmers'ForestProductionAssociationsAreEffectiveinProtectingForests¥byZengJianxinFarmersarethemainforceinsocialforestryprogra...

  • 标签:
  • 简介:

  • 标签:
  • 简介:Submergedvegetationhasasignificantimpactonwaterflowvelocity.Currentinvestigationsincludetheimpactthroughaddingdragresistanceandincreasingbottomroughnesscoefficient,whichcannotelucidatethecharactersofrealsubmergedvegetation.Toevaluatetheeffectsofsubmergedvegetationonwatercurrentsatdifferentvelocities,alaboratoryexperimentwasconductedusingthreekindsofvegetations.Theeffectiveheightsofthesevegetationsonvaryingflowvelocitieswereevaluated.AnequationdescribingtherelationshipbetweenthenormalizedresistanceofthesubmergedplantsandtheReynoldsnumberbasedontheplanteffectiveheightwasthenestablishedandusedtocalculatethehydraulicresistanceparametersofsubmergedplantsindifferentstagesofgrowth.

  • 标签: 沉水植物 有效高度 液阻 作者 沉水植被 拖曳阻力
  • 简介:U.S.sanctionsonIranhaveexpandedsincethestartoftheIraniannuclearissue.Theyhavegrownfromsmall-scaleembargoestotoday’ssanctionsonmultiplesectorsincludingfinance,trade,energy,andpersonnel.DuringU.S.PresidentBarackObama’stenure,thereisverylittlelikelihoodthattheU.S.willresorttoforce,leavingWashingtonwithnoothermeansthansanctionstopersuadeIrantochangeitsnuclearpolicy.Thismeansthatalthoughsanctionshavealimitedeffect,theU.S.willcontinuetoprimarilyrelyonthemtoforceIran’shand.

  • 标签: 伊朗 美国 扩散运动 中东地区 以色列 威胁
  • 简介:background study1.the current situation about listening teaching in C.M.S.C.2.the analysis of the reasons for students’ poor listening ability(1) about the teaching aspecta.without listening test b.the textbook limitc.the teachers’ limited knowledge of English teaching methoddogy ,the natures of listening1.what is listening.2.why is listening important in senior students’ English learning.3.what are the factors influencing the listening comprehension in C.M.S.C.III part three,evaluation1.the feasibility(1)having special time for completing listening activities (2)using a good-quality recorder in class(3)having sufficient materials to be selected for listening practice(4)the students’ necessary knowledge of the world2.the application of listening activities in classroom.3.the anticipated problems in implementing listening activitiesV part five

  • 标签:
  • 简介:WederivedrevisedeffectivediffusionenergybarriersfollowingtheBoltzmanndistributionassumptionforimpurityatomsinabulkmaterialundertheimpactofvariouskindsofpointdefectstorevealtheinsightsofmigrationmechanisms.Theeffectivediffusionenergybarriersofcopperimpuritiesinbulkzirconiumwerecalculatedthroughthefirstprinciplemethodunderthepresentedhypothesis.Ourresults(?E||=1.27eV,?E⊥=1.31eV)agreedwellwiththeexperimentalresults(?E||=1.54eV,?E⊥=1.60eV),whichvalidatedbulkdiffusionasthemajormechanismforcopperdiffusioninzirconium.Theeffectivediffusionenergybarrierscouldbeusedforestimatingwhetherthedefectswillacceleratethediffusionorslowthemdownbyactingastrapsoftheimpurityatoms.Ontheotherhand,thefirstprincipleresultsoftheimpuritydiffusionviadefectscouldbefurtherusedasinputsoflargerscalecomputationalsimulations,suchasMC(MonteCarlo)orPhaseFieldcalculations.

  • 标签: BOLTZMANN distribution DIFFUSION energy BARRIER point
  • 简介:IntermittentPneumaticCompression(IPC)hasbeenusedsuccessfullyforthepreventionofearlypostoperativedeepveinthrombosis(DVT).RecentlyIPChasbeendescribedforthetreatmentoflymphedema,chronicedema,recoveryfromlowerextremityulcersandtheenhancementofwoundhealing.ForgoodapplicationsofIPCinclinic,itisnecessarytostudyitseffectivemechanismfurther.Wemeasuredsome

  • 标签: hasbeen Compression EDEMA POSTOPERATIVE CLINIC HEALING
  • 简介:乐队结构和混乱黄铜矿的有效质量光电的材料Cu1xAgxGaX2(X=S,Se)被密度调查功能的理论。特殊quasirandom结构被用来在Cu/Ag地点模仿本地原子混乱。加修正方法的本地密度被采用为所有混合物获得正确半导体乐队差距。bandgap异例能为硫化物和硒化物被看见,在Ag混合物的差距价值比Cu混合物的那些大的地方。乐队差距能为Cu1xAgxGaSe2,并且从为Cu1xAgx煤气的2。乐队差距最小和最大值发生在在x=附近0.5并且x=1,分别地为硫化物和硒化物。以便显示出Cu1xAgx有效的团作为混乱Ag集中的功能被显示出的GaX2,。最后,详细说明了结构被给看澄清基本间接差距的转变需要的声子动量的乐队。这些结果应该在设计高效率的光电的设备是有用的,与更好的吸收和高活动性,由在CuGaX2的做Ag。

  • 标签: 有效质量 能带结构 黄铜矿 无序 密度泛函理论 铜化合物
  • 简介:Optimizationofcompositionandmicrostructureisimportanttoenhanceperformanceofsolidoxidefuelcells(SOFC)andlithium-ionbatteries(LIB).Forthis,theporouselectrodestructuresofbothSOFCandLIBaremodeledasabinarymixtureofelectronicandionicconductingparticlestoestimateefectivetransportproperties.Particlepackingsof10000spherical,binarysizedandrandomlypositionedparticlesarecreatednumericallyanddensifiedconsideringthediferentmanufacturingprocessesinSOFCandLIB:thesinteringofSOFCelectrodesisapproximatedgeometrically,whereasthecalenderingprocessandvolumechangeduetointercalationinLIBaremodeledphysicallybyadiscreteelementapproach.Acombinationofatrackingalgorithmandaresistornetworkapproachisdevelopedtopredicttheconnectivityandefectiveconductivityforthevariousdensifiedstructures.ForSOFC,asystematicstudyoftheinfluenceofmorphologyonconnectivityandconductivityisperformedonalargenumberofassemblieswithdiferentcompositionsandparticlesizeratiosbetween1and10.Incomparisontopercolationtheory,anenlargedpercolationareaisfound,especiallyforlargesizeratios.Itisshownthatincontrasttoformerstudiesthepercolationthresholdcorrelatestovaryingcoordinationnumbers.Theefectiveconductivityshowsnotonlyanincreasewithvolumefractionasexpectedbutalsowithsizeratio.ForLIB,ageneralincreaseofconductivityduringtheintercalationprocesswasobservedincorrelationwithincreasingcontactforces.Thepositiveinfluenceofcalenderingonthepercolationthresholdandtheefectiveconductivityofcarbonblackisshown.Theanisotropycausedbythecalenderingprocessdoesnotinfluencethecarbonblackphase.

  • 标签: 有效电导率 电极结构 细观力学模型 固体氧化物燃料电池 锂离子电池 粒状
  • 简介:Toutilizingthecharacteristicofradarcrosssection(RCS)ofthelowdetectableaircraft,aspecialpathplanningalgorithmtoeludingradarsbythevariableRCSispresented.ThealgorithmfirstgivestheRCSchangingmodeloflowdetectableaircraft,thenestablishesathreatmodelofaground-basedairdefensesystemaccordingtotherelationsbetweenRCSandtheradarrangecoverage.Bythenewcostfunctionsoftheflightpath,whichconsiderbothfactorsofthesurvivalprobabilityandthedistanceoftotalroute,thispathplanningmethodissimulatedbasedontheDijkstraalgorithm,andtheplannedroutemeetstheflightcapacityconstraints.Simulationresultsshowthatusingtheeffectivepathplanningalgorithm,thelowdetectableaircraftcangivefullplaytoitsownadvantageofstealthtoachievethepurposeofsilentpenetration.

  • 标签: 系统工程 系统分析 防卫系统 RCS 航行器
  • 简介:Asinterpretationisanintentionalandinterpersonalinteraction,anidealresultcan’tbeeasilyachievedbetweenthesenderandthereceiverduetothechallengesposedbylanguagesandculturalbarriers.FromtheperspectiveofintentionandfunctioninSkopostheorie,typicalexamplesareanalyzedtoillustratehowtoachieveaneffectiveinterpretationbyconsideringthesender’sintentionandthereceiver’sacceptance.

  • 标签: EFFECTIVE INTERPRETATION INTENTION FUNCTION Skopos
  • 简介:TheroleplayedbyDNAinmolecularbiologyisclearlyrecognizedtobevitaltolifeonthisplanet.8-oxo-7,8-dihydro-2deoxyguanosine(=8-OHdG),isprobablythemostimportantproductof"oxidativestress”inDNA.ItsconcentrationinDNAis,infact.aquantitativeanalysisofthedegreeofDNAdamagethatanorganismhasundergone.Duetotheimportanceof8-OHdGofnucleicacidginmutagenesis,carcinogenesisandaging,numerouschemicalandbiologicalinvestigationshavebeenmadeonthissubjectinthepasttime.Kuchinoandco-workershavefoundthat8-OHdGresidueinDNAismisreadingduringtheprocessofDNAreplication.Recently,somereportshavebeenpresentedonhigh8-OHdGlevelsinpatientssufferingfromvariousdiseasessuchaschronichepatitis,Fanconisanemia,diabetesmellitusandHelicobacterpyloriinfections.Asaresult,8-OHdGisausefulmarkerforthestudyofDNAdamagearisingfromreactiveoxygenspeciesandisofgreatsignificanceforcancerresearch.The8-OHdGlevelsinDNAcanhelpunderstandthemechanismofcarcinogensandleadtomoreeffectivetreatmentsformanydifferenttypesofcancer.Forthesereasons,ananalysisof8-OHdGwithquickness,lowcostandhighaccuracyisrequired.

  • 标签: