简介:TheJinsha金沙SitewasdiscoveredinFebruary8,2001.BetweenthenandMarch2003,asavagearchaeologicalendeavorthatinvolvedthefieldstrategiesofsubsurfaceprobingandextensiveexcavationhadbeencarriedoutincoordinationwiththecity'sinfrastructuredevelopment.Theprojectrevealedsomeofthebasicfeaturesofthesite.
简介:ThispaperdealswithafossiltaxonofBittacidae(Mecoptera,Insecta)collectedfromtheMiddleJurassicHaifanggouFormationinBeipiaocounty>Liaoningprovince,andconsideredtobeadiscoveryinChina.Basedmainlyonitssalientfeatures,anewgenus-Liaobittacusgen.nov-iserectedanditsaffinityandmigrationarealsodiscussed.
简介:Asynergyofcomputersimulations,analyticalformulations,andexperimentsprovesveryeffectiveinresearchanddevelopment.Usingnanorodgrowthasanexample,thisletterpresentsthesynergyofthethreecomplementaryapproachesinresearch,anddemonstratesitseffectiveness.Throughthissynergy,atheoreticalframeworkofnanorodgrowthemerges;throughthedirectionofthetheories,experimentalrealizationofsmallestwell-separatednanorodsbecomesreality;throughtherealizationofsuchnanorods,metallicglueinambientenvironmentsbecomestechnicalrealityandcommercialpossibility.
简介:Withmassiveamountsofdatastoredindatabases,mininginformationandknowledgeindatabaseshasbecomeanimportantissueinrecentresearch.Researchersinmanydifferentfieldshaveshowngreatinterestindateminingandknowledgediscoveryindatabases.Severalemergingapplicationsininformationprovidingservices,suchasdatawarehousingandon-lineservicesovertheInternet,alsocallforvariousdataminingandknowledgediscoverytchniquestounderstandusedbehaviorbetter,toimprovetheserviceprovided,andtoincreasethebusinessopportunities.Inresponsetosuchademand,thisarticleistoprovideacomprehensivesurveyonthedataminingandknowledgediscorverytechniquesdevelopedrecently,andintroducesomerealapplicationsystemsaswell.Inconclusion,thisarticlealsolistssomeproblemsandchallengesforfurtherresearch.
简介:Thispaperproposestheprincipleofcomprehensiveknowledgediscovery.Unlikemostofthecurrentknowledgediscoverymethods,thecomprehensiveknowledgediscoveryconsidersboththespatialrelationsandattributesofspatialentitiesorobjects.Weintroducethetheoryofspatialknowledgeexpressionsystemandsomeconceptsincludingcomprehensiveknowledgediscoveryandspatialunioninformationtable(SUIT).Intheory,SUITrecordsallinformationcontainedinthestudiedobjects,butinreality,becauseofthecomplexityandvarietiesofspatialrelations,onlythosefactorsofinteresttousareselected.Inordertofindoutthecomprehensiveknowledgefromspatialdatabases,anefficientcomprehensiveknowledgediscoveryalgorithmcalledrecycledalgorithm(RAR)issuggested.
简介:TheauthorshavedetailedlyandsystematicallystudiedthecarbonisotopiccompositionofEarlyProterozoiccarbonaterocks.SampleswhicharealldolomicriteweretakenfromtheJianancun,DaguandongandHuaiyincunFormationsoftheHutuoGroupinWutaiCountyShanxiProvince,NorthChina.Atotalof209sampleswereanalysedfortheircarbonisotopecompositions,andthemeansamplingintervalwas6.9m.Carbonisotopeanalysisclearlyshowsδ13CshiftsattheboundarybetweentheJian’ancunFormationandDaguandongFormationandneartheboundarybetweentheDaguandongFormationandHuaiyincunFormation.LikecarbonisotopeshiftsattheCretaceous-Tertiary,Permian-TriassicandPrecambrian-Cambrianboundaries,thediscoveryofδ13CshiftsintheEarlyProterozoichasimportantsignificanceinfurtherstudiesonEarlyProterozoicbioticevolution,regionalandglobalstratigraphiccorrelation,andcarbongeochemicalcycles.
简介:Inthispaper,aneweffectivemethodisproposedtofindclassassociationrules(CAR),togetusefulclassassociationrules(UCAR)byremovingthespuriousclassassociationrules(SCAR),andtogenerateexceptionclassassociationrules(ECAR)foreachUCAR.CARmining,whichintegratesthetechniquesofclassificationandassociation,isofgreatinterestrecently.However,ithastwodrawbacks:oneisthatalargepartofCARsarespuriousandmaybemisleadingtousers;theotheristhatsomeimportantECARsaredifficulttofindusingtraditionaldataminingtechniques.Themethodintroducedinthispaperaimstogetovertheseflaws.Accordingtoourapproach,ausercanretrievecorrectinformationfromUCARsandknowtheinfluencefromdifferentconditionsbycheckingcorrespondingECARs.Experimentalresultsdemonstratetheeffectivenessofourproposedapproach.
简介:亚群发现是关于利息的一个性质在不同变量之中发现有趣的协会的一种数据采矿技术。存在亚群发现方法为寻找采用不同策略,修剪并且评价亚群。学习哪个一个亚群发现算法的特征应该为产生优秀亚群被考虑是很关键的。在这方面,很多评论在亚群发现上被进行了。尽管他们在一些流行亚群发现方法上提供宽广概述,他们为亚群评估采用很少数据集和措施。根据存在措施,亚群不能从所有观点被估价。我们的工作由使用大量数据集并且由为亚群评估定义新措施在一些流行亚群发现方法上执行广泛的分析。分析结果将帮助做好理解主要亚群发现方法,揭开为进一步的改进的差距并且为特定的申请领域选择算法的合适的范畴。
简介:Duetothecapabilityofreflectingsocialperceptiononsemanticofresources,folksonomyhasbeenproposedtoimprovethesociallearningforeducationandscholarresearching.However,itsactualimpactissignificantlyinfluencedbythesemanticambiguityproblemoftags.So,inthispaper,weproposedanovelwayofdetectinghomonyms,oneofthemainsourcesoftag’ssemanticambiguityproblem,innoisyfolksonomies.Thestudyisbasedontwohypotheses:1)Usershavingdifferentintereststendtohavedifferentunderstandingofthesametag.2)Usershavingsimilarinteresttendtohavecommonunderstandingofthesametag.Therefore,wefirstlydiscoverusercommunitiesaccordingtousers’interests.Then,tagcontextsarediscoveredinsubsetsoffolksonomyonthebasisofusercommunities.Theexperimentalresultsshowthatourmethodiseffectiveandoutperformthemethodfindingtagcontextsusingalltagsinfolksonomywithoverlappingclusteringalgorithmespeciallywhenvarioususershavingdifferentinterestsarecontainedbythefolksonomy.
简介:Overthepastseveralyears,theseverityofHelicobacterpylori(H.pylori)infectionshasnotsignificantlydiminished.Aftersuccessfuleradication,theannualH.pylorirecurrencerateisapproximately13%duetooralH.pyloriinfection.EstablishedclinicaldiagnostictechniquesdonotidentifyanoraletiologicbasisofH.pyloripriortogastricinfection.TherehasbeendisagreementastowhetheroralinfectionofH.pyloriexistsornot,withnodefiniteconclusion.Inmedicalpractice,negativeresultswiththeureabreathtestsuggestthatthestomachinfectionofH.pyloriiscuredinthesepatients.Infact,patientscanpresentnegativeureabreathtestresultsandyetexhibitH.pyloriinfectionduetooralinfection.ThepresentpaperprovidesevidencethatH.pylorioralinfectionisnonethelesspresent,andtheoralcavityrepresentsasecondarysiteforH.pyloricolonization.
简介:1.ObjectiveThestudyareaislocatedinthenorthofJianshiarea,Hubeiprovince.Accordingtothegeologicsurvey,theSilurianblackshaleintheareaischaracterizedbyhighabundanceoforganicmatterandhighhydrocarbonpotential.From1980s,JianghanOilfieldhasdrilled7wellsinJiannangasfieldlocatedinthesouthofstudyarea,whichshoweddifferentdegreeofoilandgasandrevealedagoodexplorationprospectfortheSilurianstrata.