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简介：ＡＮＥＦＦＥＣＴＩＶＥＩＭＰＲＯＶＥＭＥＮＴＯＦＲＥＭＥＳＡＬＧＯＲＩＴＨＭＸｉｏｎｇｇｕｉｊｉｎｇ；（熊规景）Ｘｉｅｓｉｑｉｎｇ（谢四清）（Ｉｎｓｔ．ｏｆＭａｔｈ．Ｓｃｉ．，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅｎｃｅｓ，４３００７１Ｗｕｈａｎ，...

简介：Whethertheconceptofeffectivestressandstraininelastic-plastictheoryisstillvalidundertheconditionoffinitedeformationwasmainlydiscussed.Theuni-axialcompressionexperimentsinplanestressandplanestrainstateswerechosenforstudy.Inthetwokindsofstressstates,thestress-straincurvedescribedbylogarithmstrainandrotatedKirchhoffstressmatchestheexperimentsdatabetterthanthecurvesdefinedbyotherstressstraindescription.

简介：转变地方法(TFM)被开发估计有任意的形状的水晶composites的各向异性的绝缘的性质和水晶包括的绝缘的性质，绝缘的轴与各向异性的水晶的那些其校长不同矩阵。包括形状引起的复杂边界值问题被介绍一个转变电场进水晶composites区域避免，并且有效各向异性的绝缘的回答以转变地被提出。而且，数字结果证明水晶composites的有效各向异性的绝缘的回答周期性地作为在包括和矩阵水晶材料的主要的绝缘的轴之间的旋转角度的功能变化。它被发现那更逍遥法外包括形状导致的包括体积部分有效各向异性的绝缘的回答上的深刻效果。

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简介：乐队结构和混乱黄铜矿的有效质量光电的材料Cu1xAgxGaX2(X=S，Se)被密度调查功能的理论。特殊quasirandom结构被用来在Cu/Ag地点模仿本地原子混乱。加修正方法的本地密度被采用为所有混合物获得正确半导体乐队差距。bandgap异例能为硫化物和硒化物被看见，在Ag混合物的差距价值比Cu混合物的那些大的地方。乐队差距能为Cu1xAgxGaSe2,并且从为Cu1xAgx煤气的2。乐队差距最小和最大值发生在在x=附近0.5并且x=1，分别地为硫化物和硒化物。以便显示出Cu1xAgx有效的团作为混乱Ag集中的功能被显示出的GaX2,。最后，详细说明了结构被给看澄清基本间接差距的转变需要的声子动量的乐队。这些结果应该在设计高效率的光电的设备是有用的，与更好的吸收和高活动性，由在CuGaX2的做Ag。

简介：Optimizationofcompositionandmicrostructureisimportanttoenhanceperformanceofsolidoxidefuelcells(SOFC)andlithium-ionbatteries(LIB).Forthis,theporouselectrodestructuresofbothSOFCandLIBaremodeledasabinarymixtureofelectronicandionicconductingparticlestoestimateefectivetransportproperties.Particlepackingsof10000spherical,binarysizedandrandomlypositionedparticlesarecreatednumericallyanddensifiedconsideringthediferentmanufacturingprocessesinSOFCandLIB:thesinteringofSOFCelectrodesisapproximatedgeometrically,whereasthecalenderingprocessandvolumechangeduetointercalationinLIBaremodeledphysicallybyadiscreteelementapproach.Acombinationofatrackingalgorithmandaresistornetworkapproachisdevelopedtopredicttheconnectivityandefectiveconductivityforthevariousdensifiedstructures.ForSOFC,asystematicstudyoftheinfluenceofmorphologyonconnectivityandconductivityisperformedonalargenumberofassemblieswithdiferentcompositionsandparticlesizeratiosbetween1and10.Incomparisontopercolationtheory,anenlargedpercolationareaisfound,especiallyforlargesizeratios.Itisshownthatincontrasttoformerstudiesthepercolationthresholdcorrelatestovaryingcoordinationnumbers.Theefectiveconductivityshowsnotonlyanincreasewithvolumefractionasexpectedbutalsowithsizeratio.ForLIB,ageneralincreaseofconductivityduringtheintercalationprocesswasobservedincorrelationwithincreasingcontactforces.Thepositiveinfluenceofcalenderingonthepercolationthresholdandtheefectiveconductivityofcarbonblackisshown.Theanisotropycausedbythecalenderingprocessdoesnotinfluencethecarbonblackphase.

简介：TheroleplayedbyDNAinmolecularbiologyisclearlyrecognizedtobevitaltolifeonthisplanet.8-oxo-7,8-dihydro-2deoxyguanosine(=8-OHdG),isprobablythemostimportantproductof"oxidativestress”inDNA.ItsconcentrationinDNAis,infact.aquantitativeanalysisofthedegreeofDNAdamagethatanorganismhasundergone.Duetotheimportanceof8-OHdGofnucleicacidginmutagenesis,carcinogenesisandaging,numerouschemicalandbiologicalinvestigationshavebeenmadeonthissubjectinthepasttime.Kuchinoandco-workershavefoundthat8-OHdGresidueinDNAismisreadingduringtheprocessofDNAreplication.Recently,somereportshavebeenpresentedonhigh8-OHdGlevelsinpatientssufferingfromvariousdiseasessuchaschronichepatitis,Fanconisanemia,diabetesmellitusandHelicobacterpyloriinfections.Asaresult,8-OHdGisausefulmarkerforthestudyofDNAdamagearisingfromreactiveoxygenspeciesandisofgreatsignificanceforcancerresearch.The8-OHdGlevelsinDNAcanhelpunderstandthemechanismofcarcinogensandleadtomoreeffectivetreatmentsformanydifferenttypesofcancer.Forthesereasons,ananalysisof8-OHdGwithquickness,lowcostandhighaccuracyisrequired.

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简介：Accordingtothenaiveconstituentquarkmodel,the?mesonisbelievedtobeanalmostpuressstate,whilethereareonlyupanddownquarks(antiquarks)inthenucleon(antinucleon).Thusthepp!??reaction,withitsdisconnectedquarklines,shouldbesuppressedaccordingtotheOkubo-Zeig-Iizuka(OZI)rule.However,eventheOZIruleisstrictlyenforcedbynature,theppreactioncanstillproceedthroughthenon-strangequarkcomponentofthe?meson,becauseoftheslightdiscrepancyfromtheidealmixingofthevectormesonsingletandoctet[1].Withthissmalldiscrepancy,onecandetermineanupperlimitforthetotalcrosssectionofpp!??reactionbycomparisontothetotalcrosssectionoftherelatedpp!ωωreaction.Thisyieldsacrosssectionforpp!??attheorderof10nb.However,theexperimentalresultshowedthatthecrosssectionat1.2GeVincidentanti-protonmomentum,=2.860.46μb,istwoordersofmagnitudelargerthantheestimatedvalue.Hence,thepp!??reactionhasattractedmuchattentionbecauseofthelargeviolationoftheOZIrule.

简介：Inthispaper,anewgloballyconvergentalgorithmfornonlinearoptimizationproblemswithequalityandinequalityconstraintsispresented.ThenewalgorithmisofSQPtypewhichdeterminesasearchdirectionbysolvingaquadraticprogrammingsubproblemperiteration.Somerevisionsonthequadraticprogrammingsubproblemhavebeenmadeinsuchawaythattheassociatedconstraintregionisnonemptyforeachpointxgeneratedbythealgorithm,i.e.,thesubproblemsalwayshaveoptimalsolutions.Thenewalgorithmhastwoimportantproperties.Thecomputationofrevisionparameterforguaranteeingtheconsistencyofquadraticsubproblemandthecomputationofthesecondordercorrectionstepforsuperlinearconvergenceusethesameinverseofamatrixperiteration,sothecomputationamountofthenewalgorithmwillnotbeincreasedmuchmorethanotherSQPtypealgorithms;Anotheristhatthenewalgorithmcangiveautomaticallyafeasiblepointasastartingpointforthequadraticsubproblemsperiteration,thiswillobivouslysimplifythecomputationprocedureofthesubproblems.Somenumericalresultsarereported.

简介：这份报纸学习多相的thermoelasticcomposites的有效性质。把免费精力和吉布斯基于Helmholtz多相的composites的单个阶段，有效有弹性的张肌，热扩大的张肌，和特定的热的免费精力借助于体积一般水准被导出这些阶段免费精力。特别强调以经常紧张、经常压力的状况，修改Eshelby的micromechanics理论在被开发被放在有效的特定的热的新分析表情的推导上，在包括之间的相互作用被考虑。作为一个解说性的例子，为三阶段的thermoelastic的有效的特定的热的分析表示合成被介绍。

简介：Inthispaperweconsidertheeffectivereducibilityofthefollowinglineardifferentialequation:x=(A+∈Q(t,∈))x,|∈|≤∈0,whereAisaconstantmatrix,Q(t,e)isquasiperiodicint,andeisasmallperturbationparameter.WeprovethatiftheeigenvaluesofAandthebasicfrequenciesofQsatisfysomenon-resonantconditions,thelineardifferentialequationcanbereducedtoy=(A^*(∈)+R^*(t,∈))y,|∈|≤∈o,whereR^*isexponentiallysmallin∈.

简介：Acoupled-modesoundpropagationmodelwithcomplexeffectivedepthispresented,inordertoinvolvetheeffectofbranchlineintegralforacousticfieldinarange-dependentwaveguide.Theequationsofmotionandcontinuityareusedtoobtainthecoupledequations,whichsatisfyboundaryconditionsinthewaveguidewithvaryingtopographyandcontainonecouplingmatrix.Meanwhile,thecouplingsbetweendiscreteandcontinuousspectrumaredealtwithbasedoncomplexeffectivedepththeory.Numericalsimulationsshowthattheaccuracyoftransmissionlossisimprovedbythecoupledmodemodelwheneigenvaluesoftrappedmodesarelocatednearthebranchpoint.Theacousticfieldinanon-horizontallystratifiedwaveguidecanbecalculatedefficientlyandaccuratelybythismodel,andtheenergycorrespondingtotrappedmodes,leakymodesandbranchlineintegralcanbeconsideredadequately.

简介：Tetraphenylporphyrin(TPP)isatypicalred-emittingluminogenshowingevidentaggregationcausedquenching(ACQ)effect.Toenhanceitsemissionefficiencyinsolidstate,fourtetraphenylethene(TPE)unitswereattachedtothefourmeso-positionsofTPPcoreviaestergroupthroughafacileandefficientroute.Thederivedcompound(4(TPE-COO)-TPP)emitsredfluorescence(peakat655nm)withagoodquantumefficiency(F)of7.5%,whichismuchhigherthanthatofTPP(Φ~0.1%).Inmolecularaggregateformedintetrahydrofuran(THF)andwatermixtures,4(TPE-COO)-TPPhasarelativehighFof12%.TheevidentlysubduedACQbehaviorcanbeascribedtothepropellershapeandbulkysizeoftheTPEunits,whichpreventtheclosepackingandstrongp-pinteractionofTPPcores.TheloosemolecularpackingandweakinterchromophoreinteractionswerevalidatedbydifferentcharacterizationmethodsincludingUV-visibleabsorption,steadystateandtransientfluorescencespectroscope,X-raydiffractionandscanningelectronicmicroscopeobservations.Itisnotedthat4(TPE-COO)-TPPhasanemissionefficiencyof14.4%indiluteTHFsolution.ThisisduetotheconjugationbreakbetweentheTPPandTPEmoieties,therotationalandvibrationalmotionsofthephenylgroupscannotquenchthefluorescenceof4(TPE-COO)-TPP.

简介：Phosphorylatedmesoporouscarbons(PMCs)wereinvestigatedascatalystsinthedehydrationoffructosetohydroxymethylfurfural(HMF).TheacidicPMCsshowbetterselectivitytoHMFcomparedtosulfonatedcarboncatalyst(SC)despiteloweractivity.TheconcentrationofP-OgroupsonthePMCwascorrelatedwiththeactivity/selectivityofthecatalysts;thehighertheP-Oconcentration,thehighertheactivity.However,thehighertheP-Ocontent,thelowertheselectivitytoHMF.Indeed,alowerconcentrationoftheP-OgroupsminimizedthedegradationofHMFtolevulinicacidandtheformationofby-products,suchashumines.Stabilitytestsshowedthatthesesystemsdeactivateduetotheformationofhuminesandwaterinsolubleby-productsderivedfromthedehydrationoffructosewhichblockedthecatalyticallyactivesites.

简介：Severaleffectivenumericalmethodsforsolvingtheelasto-plasticcontactproblemswithfrictionarepres-ented.First,adirectsubstitutionmethodisemployedtoimposethecontactconstraintconditionsoncondensedfiniteele-mentequations,thusresultinginareductionbyhalfinthedimensionoffinalgoverningequations.Second,analgorithmcomposedofcontactconditionprobesandelasto-plasticiterationsisutilizedtosolvethegoverningequation,whichdistinguishestwokindsofnonlinearities,andmakesthesolutionunique.Inaddition,Positive-NegativeSequenceModifica-tionMethodisusedtocondensethefiniteelementequationsofeachsubstructureandananalyticalintegrationisintro-ducedtodeterminetheelasto-plasticstatusaftereachtimesteporeachiteration,hencethecomputationalefficiencyisen-hancedtoagreatextent.Finally,severaltestandpracticalexamplesarepressentedshowingthevalidityandversatilityofthesemethodsandalgorithms.