简介：

简介：Inthispaper,theradiationgraftcopolymerofMgO,SiO2andY-molecularsieveontoorganiccompounds,suchasmethacrylate,styreneandacrylomitrileobtainedbyper-radiationmethodwerecharacterizedbyX-raydiffraction,pyrolysisgaschromatography,GPCandX-rayphotoelectronspectroscopy.

简介：Photoisomerization(trans-cis)ofazoaromaticcompoundshasbeeninvestigatedextensivelyusingabsorptionspectroscopysince1950s[1].Byirradiationwithlightofwavelengthλ1orλ2,thegeometricconfigurationoftheazobondinazobenzenebasedcompoundscanbereversiblyswitchedfromtranstocis.Thetwostateshavedistinctabsorptionspectra.Thisfeaturewouldallowreversiblestorageofdataonthebasisofcisandtransstateswiththeaidofλ1andλ2.However,thecisstateisthermodynamicallyunstablewithrespecttothetransstate,thereforeathermalrelaxationprocessoccursinthedark(atroomtemperature).Thisthermalback-reactionstronglylimitsthelifetimeofthecisstate,anditisinfluencedbythesubstituentR1andR2,catalysts,temperature,andenvironment(solventpolarity,typeofpolymermatrix)[2].

简介：Thestarch/D,L-lactidegraftcopolymersweresynthesizedbyreactingD,L-lactidewithcornstarchinN,N-dimethylacetamide(DMAM)inthepresenceoftriethylamine(NEt3)andanhydrouslithiumchloride.TheeffectofreactiontimeandthemolarratioofD,L-lactidetoglucosestructuralunitofstarchonmonomerconversion(C%),graft(G%)andgraftefficiency(GE%)werestudied,TheC%,G%andGE%couldapproach37.3%179.7%and68.0%,respectivelywhenthemolarratioofD,L-lactidetoglucosestructuralunitofstarchis10:1andthegraftcopolymerizationwascarriedoutat80-85℃for4hrundernitrogenatmosphere.TheFouriertransformsinfra-red(FTIR)spectroscopy.differentialscanningcalorimetry(DSC)andX_raydiffraction(XRD)spectroscopywereusedinordertocharacterizethegraftcopolymers.FTIRspectrashowthatabsorptionbandat1740cm^-1confirmedtheformationofesterbond,indicatingthestarch/D,L-lactidegraftcopolymerswereproduced,theDSCcharacteristicresultsshowthemeltingtemperatureofthegraftcopolymerwereelevatedslightlyasthemolarratioofD,L-lactidetoglucosestructuralunitsofstarchincreasedandtheX-raydiffractionspectrashowthesynthesizedgraftcopolymerswereamorphous.Thedegradabilityofgraftcopolymerwastestedwiththeaidofacid,alkaliandmicrobesuchasbacillussubtilisandstaphylococcusaureus.Theresultsofwaterrsistanceshowthegraftcopolymerproducedcanbeusedasacomponentofimpermeablecoatingforcardboard.

简介：Afreestandingfilmofpolyanilineaslargeas18cm×18cm×0.002cmcanbeobtainedbyevaporationofasolutionofthechemicallysynthesizedbaseinNMP.Itsstructurewasexaminedbytheelementalanalysis,IR,U.V.-visiblespectra,XPS,DSC,SEMandX-rayscatteringanditsconductingbehavioraswellaselectrochemicalpropertieswerestudied.Resultsshowthatthecomposition,structureofmainchain,physicalpropertiesofthefreestandingfilmofpolyanilmeissimilartothatofthepowder.However,somedifferencesinitselectronicstructure,conductivityatroomtemperatureandpotentialofredoxcouplebetweenthefleestandingfilmandpowderareobserved,whichmaybeduetocross-linkingofthefilmofpolyaniline.

简介：FLASHatDESY,Hamburg,Germanyisthefirstfree-electronlaser(FEL)operatingintheextremeultraviolet(EUV)andsoftx-raywavelengthrange.FLASHisauserfacilityprovidingfemtosecondshortpulseswithanunprecedentedpeakandaveragebrilliance,openingnewscientificopportunitiesinmanydisciplines.Thefirstcallforuserexperimentshasbeenlaunchedin2005.TheFLASHlinearacceleratorisbasedonTESLAsuperconductingtechnology,providingseveralthousandsofphotonpulsespersecondtouserexperiments.Probingfemtosecond-scaledynamicsinatomicandmolecularreactionsusing,forinstance,acombinationofx-rayandopticalpulsesinapumpandprobearrangement,aswellassingle-shotdiffractionimagingofbiologicalobjectsandmolecules,aretypicalexperimentsperformedatthefacility.WegiveanoverviewoftheFLASHfacility,anddescribethebasicprinciplesoftheaccelerator.Recently,FLASHhasbeenextendedbyasecondundulatorbeamline(FLASH2)operatedinparalleltothefirstbeamline,extendingthecapacityofthefacilitybyafactoroftwo.

简介：

简介：我们分类稳定的homotopy类型(n1)有2的维的polyhedra和3扭转释放的-connected,(n+k)为k的相同6。使用的技术是被Drozd给的矩阵问题(bimodule范畴)。

简介：我们考虑形式\的上下文无关语法(G=\{f\tof^{b_1+b_2+1}g^{a_1+a_2}，g\tof^{b_1}g^{a_1+1}\}\)，在哪儿一i和bi是易于某些确实条件的整数。如此的语法G产生三角形的数组{T(n，k)}<潜水艇class=“a-plus-plus”>0kn令人满意一种三术语的复发关系。许多组合序列能这样被产生。让T<潜水艇class=“a-plus-plus”>n(x)=<潜水艇class=“a-plus-plus”>k=0<啜class=“a-plus-plus”>nT(n，k)x<啜class=“a-plus-plus”>k。关于G基于微分操作员，我们定义线性操作员P的一个序列n以便Tn+1(x)=Pn(Tn(x))。使用由于Borcea和Br在multivariate多项式上保存线性操作员的真实稳定性的描述?nd?訤?X

简介：Vibrationofacircularmembraneincontactwithafluidhasextensiveapplicationsinindustry.Thenaturalvibrationfrequenciesfortheasymmetricfreevibrationofacircularmembraneincontactwithaboundedincompressiblefluidarederivedinthispaper.Consideringsmalloscillationsinducedbythemembranevibrationinanincompressibleandinviscidfluid,thevelocitypotentialfunctionisusedtodescribethefluidfield.Twoapproachesareusedtoderivethefreevibrationfrequenciesofthesystem,whichincludeavariationalformulationandanapproximatesolutionemployingtheRayleighquotientmethod.Agoodcorrelationisfoundbetweenfreevibrationfrequenciesevaluatedbythesemethods.Finally,theeffectsofthefluiddepth,themassdensity,andtheradialtensiononthefreevibrationfrequenciesofthecoupledsystemareinvestigated.

简介：

简介：ＲＥＧＵＬＡＲＩＴＹＯＦＴＨＥＦＲＥＥＢＯＵＮＤＡＲＹＩＮＥＬＥＣＴＲＯＣＨＥＭＩＣＡＬＭＡＣＨＩＮＩＮＧＰＲＯＢＬＥＭＹｕａｎＧｕａｎｇｗｅｉ（ＩｎｓｔｉｔｕｔｅｏｆＡｐｐｌｉｅｄＰｈｙｓｉｃｓａｎｄＣｏｍｐｕｔａｔｉｏｎａｌＭａｔｈｅｍａｔｉｃｓ...

简介：Astrikeresetoptionisanoptionthatallowsitsholdertoresetthestrikepricetotheprevailingunderlyingassetpriceatamomentchosenbytheholder.Thepricingmodeloftheoptioncanbeformulatedasaparabolicvariationalinequalityandtheoptimalresetstrategyisthefreeboundary.ThesmoothnessofthefreeboundaryinsomecaseswasshowedinourarticlepublishedinJDE.Wewouldproveitssmoothnessintheothercaseinthispaperbyageneralizedcomparisonprincipleforthevariationalinequality.

简介：Inthispaper,weprovetheexistencetheoremsoflocbalorglobalclassicalsolutionstoStefanproblemswithvariouskineticconditionsatthefreeboundary.

简介：Synthesisofsuperabsorbentofstarch-graft-poly(patassiumacrylate-co-acrylamide)hasbeenstudiedbyinversesuspensionpolymerization.Inthispaper,theeffectsofreactionconditions,suchas,monomericconcentration,theamountofcross-linkingagent,ratioofwatertooil,reactiontemperatureandthebestconditionbeingabletoobtainthesphericalresinwereinvestigated.Experimentsshowthatthewater-absorbingresinisstrongandcapableofresistingpressureofretainwater.Itkeepstheshapeofparticlesafterabsorbingwater.Aftermixingwithsoil,itdoesnotbecomesticky,andthecoosstructurecanbetterretainair.Itjustfitagricultureandforest.Inaddition,thermogravimetricanalysisrevealedthesuperiorthermalstabilityofthegraftedproduct,anditslargesizeparticlesalsoreducesriskofairpollution.

简介：革新，包含工艺的转变和管理重组，在现代社会引起重要变化。在这份报纸，调查革新怎么能被支持，我们建议一个基于比赛的模型学习人的创新行为的co进化的动力学。没有规模的网络上的模拟被进行，在哪个每个节点的创新行为基于关于它的革新的反馈坚定、更新，也就是革新地位的散开。模型的数字模拟产生一系列模式，它关于真实世界的创新行为与民族日报经验和感觉一致。明确地，动力学上的各种各样的可伸缩的空间与时间的性质和富有的结构的影响能被观察。这个模型提供一条新奇途径理解创新行为的进化并且为革新提升的策略研究提供卓见。

简介：我们考虑在位于没有规模的网络的联合振荡器的synchronizability上聚类系数的效果。聚类系数瞄准一个高度聚类的没有规模的网络模型，的价值的分析结果Holme-Kim模型被获得，并且在网络synchronizability之间的关系和聚类的系数被报导。Thesimulation结果强烈建议那越多聚类网络，越poorerthesynchronizability。

简介：Anewmeshfreemethodproposedbytheauthorswaspresented,inwhichthederivativesateachnodewereconstructedusingwholederivativeformulasthroughthenodesselectedaroundthenodeusinglocalCartesianframeinanautonomousmanner,sothatwithoutanyelementitcouldbeconsideredasacompletelymeshfreemethod.Themethodwastestedwithanumericalexample,andreliablesolutionwasobtainedwithhighaccuracyandefficiency.

简介：Thevibrationisoneoftheimportantfactorsaffectingimagingqualityofconventionalremotesensingimagingbecausetherelativemotionbetweentheimagingsystemandthetargetcanresultinthedegradationofimagingquality.Theinfluenceofthevibrationofthedetectorinthetestpathonreflectiveghostimaging(RGI)isinvestigatedtheoreticallyandexperimentally.Weanalyzetheeffectsofthevibratingamplitudeandvelocity.Theresultsdemonstratethatthemicrovibrationsofthebucketdetectorhavealmostnoimpactontheimagingresolutionandsignal-to-noiseratio(SNR)ofRGI,i.e.,thedegradationofimagingqualitycausedbythevibrationofthedetectorcanbeovercometosomeextent.Ourresultscanbehelpfulforremotesensingimaging.

简介：作为塑料失真的卷屈计算的脱臼密度张肌在水晶粘性被认为是一个新组成的变量。脱臼密度张肌上的免费精力功能的依赖被探索从二次的ansatz开始。一个人和对数的相关性当时是的等级从脱臼的统计理论基于考虑想象。介绍免费精力潜力的关联从相应分析答案被评估周期二阶段把问题压成薄片在下面在一层是经历单身者的单个水晶材料的地方，砍滑倒并且第二仍然保持完全有弹性。