简介：GeographicalInformationSystem(GIS)iswidelyusedinmanyfields.Withtherapiddevelopmentofcomputernetwork,GISuserscaremoreaboutdatasharinginnetworks.Intraditionalrelationaldatabase,dataconsistencywascontrolledbyconsistencycontrolmechanismwhenadataobjectislockedinasharingmode,othertransactionscanonlyreadit,butcannotupdateit.Thisisappropriateintraditionalrelationaldatabasesthatstoreattributedataandmainlydealwithshorttransactions.Inspatialdatabases,becauseofvastamountofdataandcomplextopologicalrelations,longtransactionaremetfrequently.Ifthetraditionalconsistencycontrolmethodhasbeenusedyet,thesystem'sconcurrencywillbebadlyinfluenced.SotherecomemanynewrequirementsfortheconsistencycontrolinthefieldofGIS.Therearemanyaspectsofdataconsistencyproblemsinspatial　databases,suchastheinconsistencybetweenattributeandgeometrydata;theinconsistencyoftopologicalrelationsaftergeometryobjectshasbeenmodified.Inthispaper,othertwocasesofdataconsistencyarediscussedinMulti_userGeographicalInformationSystem.　　InGIS,therearemanyformsofdata,suchasgeometrydata,attribute,imagedata,andDEMdata.Inthispaper,weonlydiscussspatialgeometrydata.

简介：ＯＢＳＥＲＶＡＴＩＯＮＦＯＲＴＯＧＡ－ＣＯＡＲＥＡＮＤＲＥＬＥＶＡＮＴＲＥＳＥＡＲＣＨＬｉＪｉ（李骥），ＬｕＥｒ（陆尔）ａｎｄＤｉｎｇＹｉｈｕｉ（丁一汇）ＣｅｎｔｅｒｆｏｒＣｌｉｍａｔｉｃＲｅｓｅａｒｃｈＩ．ＲＥＰＯＲＴＯＮＴＯＧＡＯＢＳＥＲＶＡＴＩ...

简介：Anewmethodofpreparationofirradiativematerialbyusingrareearthasluminophorandinorganicpowderasbasenucleuswaspresented.Rareearthwasusedtomakecolloid,whichwasmixedwithbasenucleussolution,wheredeposition/attachmentreactiontookplaceandrareearthwasadheredontothesurfaceofbasenucleus,henceyieldinganewrareearthencapsulatedirradiativematerial.Fluorescentspectrumanalysisshowsthatthismaterialpossessestwoemissionpeaks,onewithin400～500nmandtheotherwithin580～700nm,reflectingtheluminouscharacteristicsoforiginalrareearthmaterial.

简介：ＲＥＳＥＡＲＣＨＡＮＤＰＲＡＣＴＩＣＥＯＦＳＥＤＩＭＥＮＴＭＡＮＡＧＥＭＥＮＴＩＮＴＨＥＧＥＺＨＯＵＢＡＰＲＯＪＥＣＴＷＡＮＧＱｉａｏａｎｄＰＡＮＱｉｎｇｘｉｎ１ＴｈｅＥｎｇｌｉｓｈｔｅｘｔｉｓｔｒａｎｓｌａｔｅｄｂｙＤｒ．ＤＩＮＧ，Ｌｉａｎｚｈｅｎ...

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简介：WeconductedtheresearchonthecalculationoftheJordannormalformofamatrixfrom1993to1998.Inthisperiod,weobtainedsometheoreticalresults,alsodevelopedandimplementedaseriesofalgorithmsforthetheoreticalresults.Nowthisresearchiscompletedtosomedegree.TheGolub-Wilkinson’sProblemComputingtheJordandecompositionofamatrix,introducedbyG.H.GolubandJ.

简介：ＳＨＩＰＨＹＤＲＯＤＹＮＡＭＩＣＳＢＡＳＩＣＲＥＳＥＡＲＣＨＩＮＴＨＥＵＮＩＴＥＤＳＴＡＴＥＳ￥ＥｄｗｉｎＰ．Ｒｏｏｄ（ＭｅｃｈａｎｉｃｓａｎｄＥｎｇｅｒｇｙＣｏｎｖｅｒｓｉｏｎ（３３３），ＯｆｆｉｃｅｏｆＮａｖａｌＲｅｓｅａｒｃｈＡｒｌｉｎｇｔｏｎ...

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简介：Thispapergivesemphasisontheresearchoftheproblemoflocalheadlossofcrossfractureflowbyalotofmodelexperiments,andatheoreticalmodeloflocalheadlossofcrossfractureflowisfoundedbyuseofthemomentumlawofwaterflow.Throughthecorrelationanalysisbetweenmodelexperimentalresultsandtheoreticalmodel,thecorrectioncoefficientoftheoreticalmodelisdefinite.Theproposedcalculationformulaoflocalheadlossofcrossfractureflowcanbeusedtoanalyzetheproblemofnetworkfractureseepage.

简介：Thenumericalsolutionofdamtoelineissolvedbasedonthedamdataandtopographicmapofdamlocated.ThedisplayofdamperspectiveisalsorealizedbyprogrammingofusingVC++andOpenGL.Theresearchresultsaboveprovidethefoundationofconstructiondesign,constructionloftingandinformationinquiry,whichavoidsthedrawbacksofonlyusingblueprintstodothesameworkinthepast.Themethodusedisusefulinpracticalengineering.

简介：TheresearchinPowerElectronicsandDivesatTheHongKongPolytechnicUniversityhasbeenundertakingformanyyears.Recently,aPowerElectronicsResearchCentre(PERC)hasbeendevelopedthatiscontributedtowardstheresearchanddevelopmentinthearea.Itencompassesthehighfrequencypowersupplies,chaosandbifurcation,soft-switchingpowerconverters,electricalmachines,highprecisionmotioncontrol,tractionandtrafficcontrol,alternativeenergyandelectricalbuildingservices.

简介：Thepaperconcernswiththedesignphilosophy,feasibilitystudy,aswellassomepeculiarfeaturesofIWHRwatertunnelforcavitationresearch.Thehighlightsworth-mentioningarethemaximumvelocityof35m/sandReynoldsnumberof1×10~7aswellastheprovisionofaspeciallydesignedairresorber.

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简介：Inthispaper,ahistoricalreviewoftheseismicnetworkofVietnamandtheabilityofthenetworktomonitorearthquakesispresented.TheseismicactivityofVietnamasacountryofhighseismictiyinthelastcenturyandsincethebeginningofthenewcenturyisdescribed.ThecurrentstateofseismologicalresearchinVietnamandcooperationwithinstitutionsoutsideofVietnamisoutlined.

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简介：ＡＢｒｉｅｆＩｎｔｒｏｄｕｃｔｉｏｎｔｏｔｈｅＭａｒｋｅｔＲｅｓｅａｒｃｈＤｅｐａｒｔｍｅｎｔＡｔｔａｃｈｅｄｔｏＣＰＩＲＣ￥／／Ａｌｏｎｇｗｉｔｈｔｈｅｐｒｏｇｒｅｓｓａｃｃｏｍｐａｎｙｉｎｇｔｈｅｐｏｌｉｃｙｏｆｏｐｅｎｉｎｇａｎｄｒｅｆｏｒｍｉ...

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