简介：ＴＨＥＲＥＶＩＳＥＤＳＴＲＵＣＴＵＲＥＯＦＧＮＥＴＩＦＯＬＩＮＡ￥ＺｈｉＭｉｎＷＡＮＧ；ＸｉａｏＴｉａｎＬＩＡＮＧａｎｄＳｈｕＦｅｎｇＣＨＥＮ（ＩｎｓｔｉｔｕｔｅｏｆＭａｔｅｒｉａＮｅｄｉｃａ，Ｃｈｉｎｅｓｅ．ＡｃａｄｅｍｙｏｆＭｅｄｉｃａｌＳｃｉｅ...

简介：Potassiumα-andβ-trivanadoenneatungstogermanateswerepreparedandcharacterizedbymeansofelementalanalysis,IR,51Vand183WNMRspectraandpolarography.Thesinglecrystalstructureofa-isomerwasdetermined.ThefinalRis0.083.TheresultsshowthattwopreparedheteropolyanionshaveKegginstructure,anda-isomerbelongstoA-typeandhasstrongeroxidizingabilitythanβ-isomer.

简介：Theelectrochemicaloxidationofdiphenylamineinacetonitrileproducesanadherentuniformpolymerfilmwhichexhibitsmutiplecolourvariation(yellow-green-blue)inawiderangeofpotentialscan.Thepolymerizationmechanismandthestructureofthepolymerwerestudiedbycyclicvoltammetry,FT-IRandinsituESR.Theresultsindicatethattheelectrochemicalpolymerizationofdiphenylaminebelongstoacationicradicalpolymerizationprocess.Duringelectrolysis,onlyoligomerswereinitialyproduced,thenpolymerfilmwasformedontheelectrodesurface.Theelectropolymerizationperformsviathe4,4’C-Cphenyl-phenylcouplingmechanism.

简介：Itisknownthatnearlyuncoupledirreduciblestochasticmatricesmustpossesssub-dominanteigenvaluesnearλ=1.Itisnaturetoaskwhethertheconverseistrue.HortfielandMeyer[2]gaveapositiveanswer.TheyintroducedthenotionofuncouplingmeasureofStochasticmatrices.Forann×nstochasticmatrixPtheuncouplingmeasureofPisde-finedasσ（p）=min((sumfromi∈M1,j∈M1(Pij))+(sumfromi∈M1,j∈M1(Pij)),wheretheminimumistakenoverall

简介：<正>Weobtaimanewsubstitutionformodulesoverexchangeringssatisfvingrelatedcompara-bilitv.Alsoweinvestigatethestructureofmodulesoverexchangeringssatisfyingpowercomparabilityandprovideanewclassofexchangeringssatisfyingrelatedcomparability.

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简介：WhenthePoissonmatrixofPoissonsystemisnon-constant,classicalsymplecticmethods,suchassymplecticRunge-Kuttamethod,generatingfunctionmethod,cannotpreservethePoissonstructure.Thenon-constantPoissonstructurewastransformedintothesymplecticstructurebythenonlineartransform.ArbitraryordersymplecticmethodwasappliedtothetransformedPoissonsystem.TheEulerequationofthefreerigidbodyproblemwastransformedintothesymplecticstructureandcomputedbythemid-pointscheme.Numericalresultsshowtheeffectivenessofthenonlineartransform.

简介：Thereisawellestablishedmultifractaltheoryforself-similarmeasuresgeneratedbynon-overlappingcontractivesimilutudes.Ourreporthereconcernsthosewithoverlaps.Inparticularwerestrictourattentiontotheimportantclassesofself-similarmeasuresthathavematrixrepresentations.ThedimensionspectraandtheLq-spectraareanalyzedthroughtheproductofmatrices.Thereareabnormalbehaviorsonthemultifrac-talstructureandtheywillbediscussedindetail.

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简介：Tetradecyldimethylbenzylammoniumsalt(TDMBA)cationswereintercalatedintosodiummontmorillonite(Na-MMT)byanionexchangereaction.TheresultingTDMBA-MMTwascharacterizedbyFourier-transforminfraredspectroscopy(FTIR),thermogravimetricanalysis(TGA),andX-raydiffraction(XRD).Moreover,theantibacterialactivityandwater-resistanceofTDMBA-MMTwereinvestigated.TheresultsshowthatTDMBAcationsareintercalatedintotheNa-MMT.TheonsettemperatureofdecompositionofTDMBAcationsinTDMBA-MMTisraisedabout60℃higherthanthatoftetradecyldimethylbenzylammoniumchloride(TDMBACl),andthed_((001))spacingenlargedfrom1.23nmto2.10nm.0.1mg/mLTDMBA-MMTisfullyenoughtokillalltheStaphylococciaureus(S.aureus)andmorethan99.99%oftheEscherichiacoli(E.coli)inasamplesolutionwithin6.0htouch,andtheTDMBA-MMTalsoshowslongactingproperties.

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简介：Triangularsystemsplayafundamentalroleinmatrixcomputations.Ithasbecomecommonplacethattriangularsystemsaresolvedtobemoreaccurateeveniftheyareill-conditioned.Inthispaper,wedefinestructuredconditionnumberandgivestructured(forward)perturbationbound.Inaddition,wederivetherepresentationofoptimalstructuredbackwardperturbationbound.

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简介：Inorganiclayeredmaterialsareaclassofadvancedfunctionalmaterialsthathaveattractedconsiderableattentionbyvirtueoftheirpracticalapplicationsinawidevarietyoffields.Systematicstudiesofstructure,design,synthesis,andfabrication

简介：平行的Liesegang模式猛抛当包含的答案一同沉淀时，乐队们被获得在一个1D胶化矩阵的离子interdiffuse。形成的节俭地可溶的盐，显示磁盘的美丽的层化猛抛对1D试管轴垂直。Liesegang结构从他们的分数维的性质的观点被分析。几何Liesegang模式与象时间，乐队间距和乐队宽度法律那样的著名实验法律在一致被构造。扩散的起始的集中上的乐队间距的依赖(外部)并且不动(内部)电解质(一0并且B0，分别地)被拿跟随Matalon-Packter法律。数学分数维的尺寸和盒子计数尺寸是计算的。分数维的尺寸被发现与增加A增加0并且减少的B0。我们也与雏晶的随机的分发分析马赛克模式，在他们的分数维的性质上比古典Liesegang胶化方法，和报告在不同条件下面成长。最后，乐队在多重谱线被组织的复杂Liesegang模式被学习，并且分数维的性质与复合增加，这被显示出。

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简介：Intheunderwater-shockenvironment,cavitationoccursnearthestructuralsurface.Thedynamicresponseoffluid-structureinteractionsisinfluencedseriouslybythecavitationeffects.Itisalsothedifficultyinthefieldofunderwaterexplosion.Withthetraditionalboundaryelementmethodandthefiniteelementmethod(FEM),itisdifficulttosolvethenonlinearproblemwithcavitationeffectssubjectedtotheunderwaterexplosion.Tosolvethisproblem,undertheconsiderationofthecavitationeffectsandfluidcompressibility,withfluidvisciditybeingneglected,a3Dnumericalmodeloftransientnonlinearfluid-structureinteractionsubjectedtotheunderwaterexplosionisbuilt.Thefluidspectralelementmethod(SEM)andtheFEMareadoptedtosolvethismodel.AftercomparisonwiththeFEM,itisshownthattheSEMismoreprecisethantheFEM,andtheSEMresultsareingoodcoincidencewithbenchmarkresultsandexperimentresults.Basedonthis,combinedwithABAQUS,thetransientfluid-structureinteractionmechanismofthe3Dsubmergedsphericalshellandshipstiffenedplatessubjectedtotheunderwaterexplosionisdiscussed,andthecavitationregionanditsinfluenceonthestructuraldynamicresponsesarepresented.Thepaperaimsatprovidingreferencesforrelevantresearchontransientfluid-structureinteractionofshipstructuressubjectedtotheunderwaterexplosion.

简介：Theeffectofdifferentkindsofcomonomerswithorwithoutflexiblechainonproper-tiesofcopolyesters,suchastransitiontemperature,crystallizationvelocity,crystallinityandsizeofcrystallites,isstudied.Theexperimentalresultsindicatetheobviousdiffer-enceinpropertiesbetweencomonomerswithiso-andortho-structureofphenylringandcomonomerswithflexiblechain.Theinfluenceofchemicalstructureofcomonomersonpropertiesofcopolyestersisdiscussed.