简介:(N-isopropylacrylamide)(PNIPAM)Poly,microgels广泛地在药交货被使用由于他们对温度的快反应。以便得到更好的biocompatibility,PNIPAMmicrogels与biocompatible材料的层典型地是涂的,与核心壳导致合成microgels结构。例如,在最近准备的合成microgel,PNIPAM胶化的microsphere被phospholipid膜围住,并且合成microgel响应温度变化展出实质的音量转变。这里,我们开发一个理论模型描述这合成microgel的热应答的行为。特别地,我们把phospholipid膜当作象橡皮状的弹性体一样表现的有弹性的层并且为nematic胶化采用免费精力的功能的形式(它指其行为强烈地被学习了的热敏感的胶化的花药种类)作为那为PNIPAM胶化。我们证明合成microgel的热应答的行为能被膜显著地影响。由在接口上调查应力的状态,我们进一步预言当涂层膜生硬、薄时,皱纹被期望在卷转变以后发生在合成microgel的外部表面上。
简介:Calibrationsbetweensodium(Na+)concentrationsfromaMt.Loganicecoreandsealevelpressure(SLP)seriesshowthatNa+concentrationsarecloselycorrelatedwiththeautumn-time(SeptemberOctober-November)Aleutianlow(AleuLow).AdeepeningoftheAleuLowstrengthensthetransportofsea-saltaerosolsfromtheNorthPacifictotheMt.Loganregion.TheMt.LoganNa+recordisusedtodevelopa292a(1688~1979)reconstructionoftheAleuLowrevealingadramaticintensificationofatmosphericcirculationovertheNorthPacificregionsincethe20thcentury.MeanSLPoftheAleuLowwasabout1hPalowerduringthe20thcenturythanduringpriorperiods.ThestrongestdeepeningoftheAleuLowappearedinthe1950s.SignificantcorrelationsarealsofoundbetweentheMt.LoganAleuLowproxyseriesandthePacificdecadaloscillation(PDO)andPacificcirculation(PC)indexduringthe20thcentury.Evolutionaryspectralanalysisoftheproxyrecordshowssignificantperiodicitiesfrom15to30aconsistentwithPDOfluctuationsandthebidecadaloscillationofNorthPacificatmosphere-oceancirculation.Aperiodof11aintheAleuLowrecordmaybeassociatedwiththeSchwabe11-acycleofsunspotactivity.AdditionallongericecorerecordsfromthisregionwillaidintheeffortstofurtherunderstandtheclimaticchangeovertheNorthPacificregion.
简介:Horizontalandverticaldistributionsofδ18Oandδ13Cwereinvestigatedinshellsoffourplanktonicforaminiferalspecies,Globigerinoidesruber,Globigerinoidessacculifer,PulleniatinaobliquiloculataandNeogloboquedrinadutertrei,fromatotalof62core-topsedimentsamplesfromtheIndonesianthroughflowregion.Resultswerecomparedtomodernhydrologicconditionsinordertoexplorepotentialofproxiesinreconstructingfluvialdischargeandupperoceanwatercolumncharacteristicsinthisregion.Ourresultsshowthat,intheMakassarStrait,bothofdepletedδ18Oandδ13Cofthesefourspecieswerelinkedtofreshwaterinput.IntheBaliSea,however,depletedδ18Oandδ13Cforthesespeciesmaybeduetodifferentreasons.Depletedδ18Owasaresultoffreshwaterinputandaswellinfluencedbyalong-shorecurrentswhiledepletedδ13CwasmorelikelyduetotheJava-Sumatraupwelling.Comparisonofshellδ18OrecordsandhydrographicdataofWorldOceanAtlas2005suggeststhatG.ruberandG.sacculifercalcifywithinthemixed-layer,respectivelyat0–50mand20–75mwaterdepth,andP.obliquiloculataandN.dutertreiwithintheupperthermocline,bothat75–125mwaterdepth.N.dutertreicalcifiesatslightlydeeperwaterdepththanP.obliquiloculatadoes.Ingeneral,δ13CvaluesofbothG.ruberandG.sacculiferarelargerthanthoseofP.obliquiloculataandN.dutertreiatallsites,possiblyrelatedtodepthhabitatsofthesespeciesandverticaldistributionofnutrientsintheIndonesianthroughflowregion.
简介:Icecoreδ18OrecordefromtheNo.aglacierattheheadoftheUrumqiRiverwereusedocharacterizetherelationshipbetweenδ18Oandcontemporaneoussurfaceairtemperature(Ta)nearbytheDaxigouMeteorologicalStation(3539mabovesealevel,-2kmawayfromtheicecoredrillingsite),Althoughtheicecorerecordsofannuallyaveragedδ18Oarepositivelycorrelatedwithconemporaneoussurfaceairtemperature,especiallysummerairtemperature,thecorrelationislesssignificantthanthatfortheprecipitationsamplesduetodepositionalandpost-depositionalmodificationprocesses,However,theClimatologicalsignificanceoftheicecorδ18Orecordscanbestillpreservedtoacertaindegree,whichmoghtextendtheapplicationofhighaltitudeandsub-tropicalicecoreδ18Orecordstopaleoclimatereconstruction.
简介:Mechanicalpropertiesofepoxyresinwereinvestigatedbyaddingcore-shellelasticparticles(CSEP).Theresultsindicatedthatoptimizedcore-shellratiowas60/40andtheloadingvolumeofCSEPwas10phr(perhundredpartsofepoxyresinbyweight).Theimpactstrengthofmodifiedsystemsincreasedapparentlywiththedecreaseofcoresizes.However,theshearingstrengthchangedgentlywiththeparticlesizes.CSEPwithlightlycrosslinkedrubberycoreshowedmoreeffectivenessontoughnessthanothers.Withsolutionblending,CSEPcouldbedispersedinepoxymatrixwell,andthemorphologiesofdispersedrubberdomainswerecontrolledperfectlybyCSEPwhosestructurewaspredesigned.Acavitation-shearingbandtoughnessmechanismwasobservedfromtheSEMmicrographsoffracturesurface.Italsowasfoundthatthedeformingtemperature(DT)ofmodifiedepoxydidnotdeclineapparently.
简介:Weperformmicromagneticsimulationsontheswitchingofmagneticvortexcorebyusingspin-polarizedcurrentsthroughathree-nanocontactgeometry.Oursimulationresultsshowthatthecurrentcombinationwithanappropriatecurrentflowdirectiondestroysthesymmetryofthetotaleffectiveenergyofthesystemsothatthevortexcorecanbeeasiertoexcite,resultinginlesscriticalcurrentdensityandafasterswitchingprocess.Besidesitsfundamentalsignificance,ourfindingsprovideanadditionalroutetoincorporatingmagneticvortexphenomenaintodatastoragedevices.
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简介:Inthepresentwork,core-shellNi@SiO2catalystswereinvestigatedinordertoevaluatetherelevanceofcatalyticactivityandsurfacestatesofNicoreaswellasNinanoparticlessizetocatalyticpartialoxidationofmethane(POM).ThecatalystswerecharacterizedbyN2adsorption,H2-TPR,XRD,TEMandXPStechniques.Thecatalyticperformanceofthecore-shellcatalystswasfoundtobedependentonthesurfacestatesofcatalyst,whichinfluencedtheformationofproducts.Itwasconsideredthatcarbondioxideformedontheoxidizednickelsites(NiO)andcarbonmonoxideproducedonthereducedsites(Ni).ThesurfacestatesofactivemetalinthedynamicwereinfluencedbothbythesizeofNicoreandtheporosityofsilicashell.However,thecatalyticactivitywouldbedebasedwhenthesizeofNicorewasunderacertainextent,whichcanbeascribedtothefactthecarbondepositionincreasedwiththeincreasingcontentofNiO.TheeffectsofsurfacestatesofNi@SiO2catalystonthecatalyticperformancewerediscussedandthereactionpathwayoverNicoreencapsulatedinsidesilicashellwasproposed.
简介:Inthispaper,wedemonstratetheacetylehe(C2H2)sensorwithhighsensitivityusingahollow-corephotonicbandgapfiber(HC-PCF).ExperimentsformeasuringC2H2concentrationsingasmixtureareperformed.Usinga2m-longHC-PCFasgascell,thespectrumofacetyleneatn1+n3bandhasbeenmeasured,andtheP11-branchhasbeenselectedforthepurposeofsensing.Aminimumdetectivityof143partspermillionbyvolume(ppmv)forthesystemconfigurationisestimated.
简介:有核心壳的合成nanoparticles组织的Cross-linked-cyclodextrinpolymer/Fe3O4在carboxymethyl-cyclodextrin的表面上经由生气连接反应被准备(厘米--CD)在-cyclodextrin的修改Fe3O4nanoparticles由把epichlorohydrin用作crosslinking的碱的答案代理人。准备合成nanoparticles的形态学,结构和磁性被传播电子显微镜学(TEM)调查,Fourier变换红外线(FTIR)spectrometry,X光检查衍射(XRD)测量,thermogravimetric分析(TGA)和颤动的样品magnetometry(VSM)分别地。
简介:polypropylene/ethylene-propylene随机copolymer/ethylene-propylene的一系列第三的混合分割了其微观结构类似于影响聚丙烯共聚物(欧洲电脑生产厂商)的那些的共聚物(HPP/EPR/EbP)被准备以便系统地在微观结构和欧洲电脑生产厂商的结晶化行为上调查作文的效果。主要阶段形态学的观察表明有核心壳结构的驱散的阶段能在某些作文被重建,过多的EPR在第三的混合导致bicontinuous阶段结构。在包括等温、非等温的结晶化经历一样的静止结晶化以后,这些混合样品展出融化行为的特殊作文依赖者,即,融化的点随EPR内容的增加显著地增加直到它在一个批评内容(大约30wt%)拒绝。结晶化行为主要被归功于到不同成核能力。尽管在EPR和HPP部件之间的相容性随EPR的增加变得更坏,由于增加的界面的区域和EbP的减少的集中满足,这被建议,在混合的更高的EPR内容除了明显的bicontinuous的外观便于到异构的成核阶段结构。
简介:Adimpleappearsonafreesurfacewhilerotatingacylindertankfilledwithliquid.Thedimplestartstoconcentricallydeepertoadrainportatthebottomcenterofthetank.Overtime,thedimplepenetratesthedrainport,afreesurfaceformsalongandslenderstringshapeinthetank,andaso-calledvortexing(aircore)phenomenonoccurs.Thegenerationofavortexcoredependsonthesizeofthetankanddrainport,andonthepropertiesoftheliquidinthetank.Inthisstudy,theliquidlevelandthetimeatwhichthevortexcoreisinitiallygeneratedarenumericallyinvestigatedusingdifferentvaluesoftankdiameter,drainportdiameter,andinitialtankrotationalspeeds.Insteadofafullthree-dimensionalanalysis,atwo-dimensionalaxisymmetricsimulationisconducted.Themomentumconservationequationinthecircumferentialdirectionisadditionallysolvedinthetwo-dimensionalmeshsystem.Severalnon-dimensionalvariablesarecreated:theratiooftheaircoregenerationdistanceandtankdiameter,thediameterratioofthetankanddrainport,therotationalReynoldsnumber,therotationalFroudenumber,andtherotationalWebernumber.Finally,thenon-dimensionalaircoregenerationdistanceiscorrelatedwiththeothernon-dimensionalparameters.
简介:TiO2@ZrO2@Y2O3:有coremultishell结构的Eu3+合成粒子通过layer-by-layer(LBL)的联合被综合自己组装方法和一个solgel过程。获得的样品与扫描电子被描绘显微镜学(SEM),传播电子显微镜学(TEM),X光检查光电子光谱学(XPS),X光检查衍射(XRD),和荧光spectrophotometry。结果证明合成粒子有coremultishell结构,球形的形态学,和狭窄的尺寸分布。TiO2核心上的ZrO2层的存在能有效地阻止在TiO2核心和Y2O3壳之间的反应;为在在TiO2@ZrO2@Y2O3的TiO2核心和Y2O3壳之间的反应的温度:Eucoremultishell黄磷能被300提高