简介：一个热水的方法准备的象花的SnO2nanopowders是经由受精与钯修改的表面。晶体结构，形态学，和样品的表面化学状态借助于X光检查衍射(XRD)被描绘，扫描电子显微镜学(SEM)，和X光检查光电子光谱学(XPS)分别地。煤气的察觉到表演也被调查。为220渠湡瑯'T獥?的热水的温度?呎?乔？

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简介：hard-core/soft-shell钙碳酸盐(CaCO3)的合成/poly(甲基methacrylate)(PMMA)混合结构化的nanoparticles(<100nm)由把分裂成原子的微乳液聚合，过程被报导。聚合物链通过acoupling代理人的使用被抛锚到nano-CaCO3的表面上，triethoxyvinylsilane(TEVS)。铵persulfate(APS)，钠dodecyl硫酸盐(SDS)和n-pentanol分别地被用作开始者，表面活化剂和cosurfactant。coreshell乳胶粒子的聚合机制被讨论。由PMMA的nano-CaCO3的封装用一台传播电子显微镜(TEM)被证实。coreshell粒子的grafting百分比被thermogravimetric分析(TGA)调查。nano-CaCO3/PMMAcoreshell粒子被Fourier变换描绘红外线(FTIR)光谱学和微分扫描热量测定(DSC)。FTIR结果在nano-CaCO3粒子和PMMA的接口揭示了一个强壮的相互作用的存在，它成功地暗示聚合物链是grafted到通过联合代理人的连接的nano-CaCO3粒子的表面上。另外，TGA和DSC结果与纯nano-PMMA的相比显示了coreshell材料的热稳定性的改进。nano-CaCO3/PMMA粒子被混合进聚丙烯(PP)矩阵由融化处理。它能也用扫描PMMA锁住的电子显微镜学(SEM)被观察grafted在聚合物矩阵(PP矩阵)防碍到CaCO3nanoparticles上CaCO3的聚集并且因此与PP矩阵改进CaCO3nanoparticles的相容性。

简介：3-DevolutionofKarmanvortexfilamentsandvortexfilamentsinbraidregionsintheturbulentwakeofa2-Dcirculaxcylinderisinvestigatednumeri-callybasedoninviscidvortexdynamicsbyanalyzingtheresponseoftheinitially2-Dspanwisevortexfilamentstoperiodicspanwisedisturbanceofvaryingmagnitude,wavelengthandinitialphaseangles.Ourresultsrevealakindof3-Dvortexsysteminthewakewhichconsistsoflargescalehorseshoe-shapedvorticesandsmallscaleλ-shapedvortexfilamentsaswellasvortexloops.Themechanismandthedynamicprocessaboutthegenerationofstreamwisevorticalstructureandthe3-Dcoherentstructurearereported.

简介：TiO2-loadedactivatedcarbonfibers（ACF）werepreparedbyahydrothermalmethod.Thesampleswerecharacterizedbyscanningelectronmicroscopy（SEM）,X-raydiffraction（XRD）,Fouriertransforminfrared（FT1R）spectrometryandUV-visdiffusereflectancespectra（DRS）.SEMimagesshowedthattheTiO2nanoparticlesweredepositedonthesurfaceofACF,andtheparticlesizeandloadingamountofTiO2werevariedbychangingtheinitialconcentrationoftetrabutyltitanate（TBOT）.TheresultsofanashexperimentshowedthattheloadingamountsofTiO2were18.4%,43.3%,52.5%,75.1%,and91.1%forinitialconcentrationsofTBOTof0.07,014,0.21,0.28,and0.35mol/L,respectively.PhysicalinteractionsplayedanimportantroleintheformationofTiO2/ACFcompositefibersthatabsorbUVandvisiblelight.ComparedwiththoseofACF,improvedadsorptionandphotocatalyticactivitytowardRhodamineB（RhB）wereobservedforTiO2/ACFcompositefiber.TheRhodamineBcouldberemovedefficientlybyTiO2/ACFcompositefibers,andtheTiO2loadingamounthadasignificanteffectonthephotocatalyticactivityofTiO2/ACFcompositefibers.

简介：Fortwo-dimensionnonlinearconvectiondiffusionequation,atwo-gridmethodofcharacteristicsfinite-elementsolutionwasconstructed.Inthismethodthenonlineariterationsisonlytoexecuteonthecoarsegridandthefine-gridsolutioncanbeobtainedinasinglelinearstep.Forthenonlinearconvection-dominateddiffusionequation,thismethodcannotonlystabilizethenumericaloscillationbutalsoacceleratetheconvergenceandimprovethecomputationalefficiency.Theerroranalysisdemonstratesifthemeshsizesbetweencoarse-gridandfine-gridsatisfythecertainrelationship,thetwo-gridsolutionandthecharacteristicsfinite-elementsolutionhavethesameorderofaccuracy.Thenumericalexampleconfirmsthatthetwo-gridmethodismoreefficientthanthatofcharacteristicsfinite-elementmethod.

简介：Aself-adaptiveprecisealgorithminthetimedomainwasemployedtosolve2-Dnonlinearcoupledheatandmoisturetransferproblems.Byexpandingvariablesatadiscretizedtimeinterval,thevariationsofvariablescanbedescribedmoreprecisely,andanonlinearcoupledinitialandboundaryvalueproblemwasconvertedintoaseriesofrecurrentlinearboundaryvalueproblemswhicharesolvedbyFEtechnique.Inthecomputation,noadditionalassumptionandthenonlineariterationarerequired,andacriterionforself-adaptivecomputationisproposedtomaintainsufficientcomputingaccuracyforthechangesizesoftimesteps.Inthenumericalcomparison,thevariationsofmaterialpropertieswithtemperature,moisturecontent,andbothtemperatureandmoisturecontentaretakenintoaccount,respectively.Satisfactoryresultshavebeenobtained,indicatingthattheproposedapproachiscapableofdealingwithcomplexnonlinearproblems.

简介：Carbonnanotube（CNTs）/Fe-Ni/TiO2nanocompositephotocatalystshavebeensynthesizedbyaninsitufluidizedbedchemicalvapordeposition（FBCVD）method.ThecompositephotocatalystswerecharacterizedbyXRD,Ramanspectroscopy,BET,FESEM,TEM,UV-visspectroscopy,andXPS.TheresultsshowedthattheCNTsweregrowninsituonthesurfaceofTiO2.Fe（lll）inTiO2showednochemicalchangesinthegrowthofCNTs.Ni（Ⅱ）waspartlyreducedtometalNiintheFBCVDprocess,andthemetalNiactedasacatalystforthegrowthofCNTs.ThephotocatalyticactivitiesofCNTs/Fe-Ni/TiO2decreasedwiththeriseoftheFBCVDreactiontemperature.ForthesamplesynthesizedatlowFBCVDtemperature（500℃）,morethan90%andnearly50%ofmethylenebluewereremovedunderUVirradiationin180minandundervisiblelightirradiationin300min,respectively.TheprobablemechanismofsynergisticenhancementofphotocatalysisontheCNTs/Fe-Ni/TiO2nanocompositeisproposed.

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简介：提出了一种在带有反转平台的精密离心机上标定陀螺加速度计二次项系数丘的方法。阐述了其测试原理，指出这种带反转平台的测试原理改善了PIGA离心机测试的环境条件。所提出的测试方案和辨识方法解决了陀螺加速度计在精密离心机上进行高占测试时，受到离心机大臂旋转牵连运动影响的关键问题，并提出分离和精确标定陀螺加速度计二次非线性项系数届的数据处理方法，解决了反转平台引入后造成的正弦输入问题。

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