简介：摘要：住宅项目地下停车库已成为拓展城市空间利用率的重要举措，地下车库作为车辆停、行主要场所，对地面使用功能、安全耐久的提出了更高的需求，金刚砂+固化剂一体化成型地面的技术逐渐普及。建设工程的前期的发展阶段，大量采用普通的混凝土地坪，项目实际的操作人员对金刚砂地坪工艺存在质量控制、技术要求的盲区，导致质量问题频发，主要体现在金刚砂完成面产生裂缝、工序安排不当造成成品破坏、多种颜色金刚砂混淆致使感观差、渗水处理不到位四方面的主要问题。实践表明，金刚砂施工采用凿毛、结浆工艺、不同颜色金刚砂施工时间流水搭接、定板取样、不同情况采取不同治理渗漏措施等一系列的技术措施，能够大幅度的提高金刚砂地面的成型质量和耐久性，满足感观和使用要求。

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简介：Variousmesoporouschromiaaluminacatalystswerepreparedbyfivedifferentmethodsbasedonametal-organicframeworkMIL-101andtheircatalyticperformancesoverisobutanedehydrogenationwereinvestigated.ThehighlydispersedchromiumspecieswereproducedoncatalystKCrAl-I1withlargestspecificsurfaceareaof198m2g-1preparedwithaluminiumisopropoxide(Al(i-OC3H7)3)byultrasonicimpregnationmethod.However,thecatalystKCrAl-I2synthesizedbystirringimpregnationpossessedcrystallineα-Cr2O3phase,whichwaspoorlydispersed.TwotypesofCr-richandAl-richCrxAl2-xO3solidsolutions,designatedasCrAl-IandCrAl-IIphase,wereformedoverthecatalystsKCrAl-I3(preparedbyAl(i-OC3H7)3withnitricacidregulation),KCrAl-C4(preparedbyaluminiumchloridehexahydrate)andKCrAl-N5(preparedbyaluminiumnitratenonahydrate).CatalyticevaluationresultsrevealedthatKCrAl-I1exhibitedthehighisobutaneconversionduetoitshighlydispersedchromiumspecies.However,KCrAl-I3,KCrAl-C4andKCrAl-N5showedthehigherisobuteneselectivity(95.2%-96.4%)onaccountoftheformationofchromiaaluminasolidsolutionsinthecatalysts.Moreover,thesolidsolutionoverthechromiaaluminacatalystscouldgreatlysuppressthecokeformation.

简介：Nestin+neuronshavebeenshowntoexpresscholineacetyltransferase(ChAT)inthemedialseptum-diagonalbandofBrocainadultrats.Thisstudyexploredtheprojectionofnestin+neuronstotheolfactorybulbandthetimecourseofnestin+neuronsinthemedialseptum-diagonalbandofBrocainadultratsduringinjuryrecoveryafterolfactorynervetransection.Thisstudyobservedthatallnestin+neuronsweredouble-labeledwithChATinthemedialseptum-diagonalbandofBroca.Approximately53.6%ofnestin+neuronswereprojectedtotheolfactorybulbandco-labeledwithfastblue.Alargenumberofnestin+neuronswerenotpresentineachregionofthemedialseptum-diagonalbandofBroca.Nestin+neuronsinthemedialseptumandverticallimbofthediagonalbandofBrocashowedobviouscompensatoryfunction.Thenumberofnestin+neuronsdecreasedtoaminimumlaterthannestin–/ChAT+neuronsinthemedialseptum-diagonalbandofBroca.Theresultssuggestthatnestin+cholinergicneuronsmayhaveacloserconnectiontoolfactorybulbneurons.Nestin+cholinergicneuronsmayhaveastrongertolerancetoinjurythanNestin–/ChAT+neurons.Thedifferencebetweennestin+andnestin–/ChAT+neuronsduringtherecoveryprocessrequiresfurtherinvestigations.

简介：The‘Chuju’(楚居),oneofthebamboo-slipmanuscriptsfromtheWarringStatesPeriodkeptintheTsinghuaUniversityLibrary,providesextensiveinformationabouttheChuroyaldynasty.The‘Chuju’(楚居)acknowledgesJilian(季連),whoadoptedthesurnameofMi(羋),asthefounderoftheChustate.However,Jilianisnotincludedamongthe‘ThreeAncestorsofChu’(sanChuxian,三楚先),i.e.Laotong(老童)Zhurong(祝融),andYuxiong(鬻熊)—alsoknownasXuexiong(穴熊)—whowerejointlyinvokedandofferedsacrificesduringtheWarringStatePeriod.Thisarticleaddressthisquestionandsuggests,basedontherecordsfromthe‘Chuju’,thatJilianandYuxiongwerebrothers,andthatthedescendantsofYuxiongwerethosewhosucceededtothethroneinsteadofthoseofJilian.SincetheChuroyaldynastywasrelatedtoYuxiongandnottoJilian,Jilianwasnotincluded,becausesacrificialritesduringtheWarringStatePeriodusedtoemphasizedirectboundswiththeirancestors.

简介：ABSTRACT:Westudytheevolutionofsingleellipticvortexringforinitialaspectratio(AR)=2,4,6.TheincompressibleNavier-Stokesequationsaresolvedbyadealiasedpseudo-spectralmethodwith64~3gridpointsinaperiodiccube.WefindthattherearethreekindsofvortexmotionasARincreasesandvortexbifurcationoccursatacertainAR.Theprocessesofadvection,interaction,anddecayofvortexringareanalyzed.Numericalresultscoincidewithexperimentsandothernumericalsimulations.

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简介：TheapplicationofBEMtocalculateacousticradiationfromclosedsurfaceinaninfiniteacousticme-diumhastheadvantagesoflessmemoryspace,higheraccuracyandfastercalculatingspeed.However,thesingularintegralsandthenonuniquenessproblemofsurfacehelmholtzequationatcharacteristicfrequen-ciesshouldbedealtwith.ItissuggestedinthispaperthatcombinationoftheinteriorHelmholtzequationanditsderivativeswithrespecttothecoordinatecomponentsofaninteriorpointformsanextraequation,inordertosolvetheproblemsofacousticradiationatvariousfrequencieswithsurfaceHelmholtzequation;ontheareawhichincludessingularpoint,thesingularintegralsareconvertedtoordinaryonesbypolarcoordinatetransformation.Asanexample.theacousticradiationfieldofclosedaxisymmetricsurfaceswithprescribedsurfacevelocitydistributioniscalculatedinthispaper.

简介：ＳＴＵＤＩＥＳＯＮＴＨＥＳＹＮＴＨＥＳＩＳＡＮＤＲＥＡＣＴＩＯＮＷＩＴＨＡＬＫＯＸＩＤＥＳＯＦ３－ＯＸＯ－１，２－ＢＥＮＺＯＩＳＯＴＨＩＡＺＯＬＩＮＥ－２－ＡＣＥＴＡＭＩＤＥ１，１－ＤＩＯＸＩＤＥＳＧｕｏＦｅｎｇＺＨＡＯ；ＨｕａＺｂｅｎｇＹＡＮＧ（Ｉ...

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简介：-Thispapercarriesouttheanalysisofmechanicsofagripsystemofthree-key-boardhydraulictongsdevelopedforoffshoreoilpipelineswhichhasbeensuccessfullyusedinoilfieldsinChina.Themainimprovementofthissystemisthataleverframestructureisusedinthestructuraldesign,whichreducesgreatlythestressesofthemajorcomponentsoftheoilpipetongs.Theoreticalanalysisandnumericalcalcu-lationbasedonthirteenbasicequationsdevelopedshowthattheteethboardofthetongsisnoteasytoslipasfrequentlyhappenstoothersystemsandisofhigherreliability.