简介：ＡＶｏｌｕｎｔｅｒＳｕｐｏｒｔｓｔｈｅＥｌｄｅｒｌｙＯｎＦｅｂｒｕａｒｙ１３，１９９７，Ｍｒ．ＹｕＸｉｎｈｕａ，ｍａｎａｇｅｒｏｆａｃｈａｉｎ－ｓｔｏｒｅｉｎＱｉｎｇｄａｏＣｉｔｙ，ＳｈａｎｄｏｎｇＰｒｏｖｉｎｃｅ，ｄｅｃｉｄｅｄｔｏｓｕｐｐｏｒｔ１...

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简介：CyberSpacefirstappearedinthesciencefiction,“Neuromancer”byW.Gibson(1984),thistermwasappliedfordescribingthedesperatevisionofthenearfuture,urbandecay,andneuralimplants.Recently,itisperceivedasawordreferringtoanentirelynewuniverseandthespacevirtuallyexistingwithintheworldwidecomputerInternet.　　BecauseCyberSpaceisanewworduptonow,thereisnotadefiniteconceptionaboutityet.Butwecanunderstanditasfollows:CyberSpaceisavirtualspacewhosedatainformationisstoredinthecomputerInternet.CreatinganyvirtualspacedependsontheelectronicaldataintheInternet.ThoughitislessthanacoupleofdecadessinceCyberSpacewasbroughtforward,ithadgrownatsucharemarkablespeedthatithadexpandedtothewidestcomputernetintheworld——Internet.Nowitsincrementstillmaintainsatthedoublerate　eachyear,anditisexpectedthattheCyberSpacewillbringanewparadigmofnetworksocietyforthenextcentury.　CyberSpacehasspecialspatialcharacteristics.Thephysicaldistanceisnotvalidinthisspace,sowemustuseanewapproachtodescribethedistance.Therearethreemethods.Oneisvaliddistancethatisafunctionaldistance,asthedistancearedescribedbytimeorcost.Thesecondisapsychologicaldistance.Namely,itisasubjectivemeasurementthatpeopleapperceivedistanceastheyareawayfromtheobject.Thethirdisaholisticdistancewhereeachchainhasitsunit.Ontheotherhand,mostCyberSpacedonottakeaccountofthegravity.Infact,thebearing,magnitudeortimeconsequenceofthegravitycanbedefinedatrandomandeasilymodified,however,theunitlengthanddirectionofthe3DvectorchangewiththedifferentpositionsinCyberSpace.Inthissense,thescaleorshapeofasinglebuildingandstreetarenotrestrictedbythespatialcondition.Theonlyfactormaintainingthespatialshapeistopologyreplacingtheorigingravity,systemtime,colorsetandspatialdimensionsetupwiththeownpsychologicals

简介：Thispaperpresentsanewmethodforsolvingthevibrationofarbitrarilyshapedmembraneswithelasticalsupportsatpoints.Thereactionforcesofdlasticalsupportsatpointsareregardedalunkmownexternalforcesactingonthemembranesthemembranes.Theexaclsolutionoftheequationofmitionisgivenwhichincludestermsrepresentingtheunknownreactionforces.Thefrequencyequationisderivedbytheuseofthelinearrelationshipofthedisplcementswiththereactionforcesofelasticalsupportsatpoints.Finallythecalculatiogformulaeofthefrequencyequationfocircularmembranesareanalyticallyperformedasexamplesandtheinheremfrequenciesofcircularmembraneswithsymmetricelasticalsupportsattwopointsarenumericallycalculated.

简介：TheVacuumVessel(VV)systemisanessentialcomponentofKedaTorusforexperiment(KTX),andvariousscenariosmighttakeplaceonit.TheVV’ssupportsshouldbeadequatelystrongtostandagainstvariousloadsonVV,whichmighthappeninextremescenarios.Therefore,thedesignofVVsupportsisverifiedinasingleextremescenarioandissubsequentlyoptimizedinthisreport.ThenumericalsimulationbasedonFiniteElementtheoryisperformedasthemajormethodforanalysisandoptimization.Theelectromagneticforceinpreviousanalysesservesastheloadforthemechanicalanalysesofsupports.Duringtheoptimization,thestressesoftheWsupportsdecreaseremarkablyafterintroducingcotters.Finally,theoptimumdesignhasbeenworkedout.Itsatisfiestherequirementsregardingthestrengthandconvenienceinassembly.

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简介：ToimplementthespiritofNoticeonWorktoExemptStudentsfromTuitionandMiscellaneousFeesduringCompulsoryEducationinCities,andtoensurecompulsoryeducationincitiesequallyprovidedtochildrenoffarmerworkers,MinistryofFinance

简介：LetMbead×dexpansivematrix,andFL2(Ω)beareducingsubspaceofL2(Rd).ThispapercharacterizesboundedmeasurablesetsinRdwhicharethesupportsofFouriertransformsofM-refinableframefunctions.Asapplications,wederivethecharacterizationofboundedmeasurablesetsasthesupportsofFouriertransformsofFMRA(W-typeFMRA)framescalingfunctionsandMRA(W-typeMRA)scalingfunctionsforFL2(Ω),respectively.Someexamplesarealsoprovided.

简介：Thesynthesisandpropertiesofcarbonxerogelsarebrieflydescribedinthismini-review,emphasizingthemethodsusedfortuningtheirsurfacechemistryandtexturalpropertiesinordertodesignefficientelectrocatalystsforfuelcells.Inparticular,theroleplayedbythesurfacefunctionalgroupsindeterminingtheloading,dispersion,oxidationstateandstabilityofthemetalphasesisaddressed.

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简介：MethacrylicacidfirstwasneutralizedwithanaqueoussolutionofNaOHtopH=6.0～7.0,vinylenecarbonate(VCA)wasaddedtothesolution,thenmonomerswerecopolymerizedinparaffinoilbymeansofreverse-phasesuspensionpolymerizationandhydrophiliccopolymericsupportswereprepared.ThepropertiesofthesupportsweredeterminedusingtrypsinandresultsshowthattheamountofenzymescoupledtothesupportsandthespecificactivityofimmobilizedtrypsinarerelatedtothecontentofVCAstructureunits,reactiontimeandconcentrationofenzymesolution,etc.

简介：Inthispaper,varioustechniquesincludingBET,XRD,SEMandXPSwereusedtostudythesinteringofpureandLa2O3-dopedtitania.Theexperimentalresultsshowthatsinteringoftitaniaproceedsviavolumediffu-sion.Addingoflanthanumoxidedecreasestherateofsinteringandhindersthephasetransitionfromanatasetorutilecrystalbystrongsurfaceinteractionbetweenthemixedcrystals(La4Ti9O24,La0.66TiO2.99)andTiO2.

简介：Aseriesofhighsurfaceareagraphiticcarbonmaterials(HSGCs)werepreparedbyball-millingmethod.EffectofthegraphiticdegreeofHSGCsonthecatalyticperformanceofBa-Ru-K/HSGC-x(xistheball-millingtimeinhour)catalystswasstudiedusingammoniasynthesisasaprobereaction.ThegraphiticdegreeandporestructureofHSGC-xsupportscouldbesuccessfullytunedviathevariationofball-millingtime.RunanoparticlesofdifferentBa-Ru-K/HSGC-xcatalystsarehomogeneouslydistributedonthesupportswiththeparticlesizesrangingfrom1.6to2.0nm.ThegraphiticdegreeofthesupportiscloselyrelatedtoitsfacileelectrontransfercapabilityandsoplaysanimportantroleinimprovingtheintrinsiccatalyticperformanceofBa-Ru-K/HSGC-xcatalyst.更多还原

简介：ThecorrelationbetweenphasestructuresandsurfaceacidityofAl2O3supportscalcinedatdifferenttemperaturesandthecatalyticperformanceofNi/Al2O3catalystsintheproductionofsyntheticnaturalgas(SNG)viaCOmethanationwassystematicallyinvestigated.Aseriesof10wt%NiO/Al2O3catalystswerepreparedbytheconventionalimpregnationmethod,andthephasestructuresandsurfaceacidityofAl2O3supportswereadjustedbycalciningthecommercialγ-Al2O3atdifferenttemperatures(600–1200C).COmethanationreactionwascarriedoutinthetemperaturerangeof300–600Catdifferentweighthourlyspacevelocities(WHSV=30000and120000mL·g-1h-1)andpressures(0.1and3.0MPa).ItwasfoundthathighcalcinationtemperaturenotonlyledtothegrowthinNiparticlesize,butalsoweakenedtheinteractionbetweenNinanoparticlesandAl2O3supportsduetotherapiddecreaseofthespecificsurfaceareaandacidityofAl2O3supports.Interestingly,NicatalystssupportedonAl2O3calcinedat1200C(Ni/Al2O3-1200)exhibitedthebestcatalyticactivityforCOmethanationunderdifferentreactionconditions.LifetimereactiontestsalsoindicatedthatNi/Al2O3-1200wasthemostactiveandstablecatalystcomparedwiththeotherthreecatalysts,whosesupportswerecalcinedatlowertemperatures(600,800and1000C).ThesefindingswouldthereforebehelpfultodevelopNi/Al2O3methanationcatalystforSNGproduction.

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