简介：Ｉｎ－ｐｌａｎｅａｎｄＯｕｔ－ｏｆ－ｐｌａｎｅＥｍｉｓｓｉｏｎｏｆＵｎｓｔａｂｌｅＮｕｃｌｅｉｆｒｏｍ４０Ａｒ＋１９７ＡｕＲｅａｃｔｉｏｎＳｙｓｔｅｍ￥ＨｅＺｈｉｙｏｎｇ；ＤｕａｎＬｉｍｉｎ；ＬｉＺｕｙｕ；ＪｉｎＧｅｎｍｉ...

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简介：我们介绍处理计算含蓄地介绍的真实代数学的平面曲线的一个有限集合的安排的拓扑学的问题的一条新代数学的途径。当以古典方法使用大规模方法解决这个问题在手边时，介绍方法的主要成就是出现的荒谬的数字的完全的回避。因此，是值得提及建议方法的效率仅仅为低度的曲线被保证。

简介：飞机和鸟有类似。事实上气体动力学底是一样。以便做一些比较，这份报纸论述实验的二个系列：在与为有flapping翅膀的空气动力学的力量的大小的一个ornithopter模型一起的一条风隧道的。翅膀运动在模型的纵的轴附近有自由flapping的二度并且在翅膀轴附近羽饰。空气动力学的力量的大小：在在运动并且在动态情况中的许多周期期间平均价值的静态的情况中上升并且拖被执行了。纸的另外的部分有或没有不平的表面在一条风隧道在一口金属飞机墙喷气上使速度和骚乱大小担心，有或没有声学的颤动以便模仿一个飞机翅膀。空气动力学的特征在所有情况中被获得了。关键词风隧道-气体动力学特征-ornithopter模型-飞机墙喷气CLC数字V211.74

简介：Wereportonthegrowthofthehigh-qualityGaNgrainonar-planesapphiresubstratebyusingaself-organizedSiNinterlayerasaselectivegrowthmask.Transmissionelectronmicroscopy,scanningelectronmicroscopy,andRamanspectroscopyareusedtorevealtheeffectofSiNontheovergrowna-planeGaNgrowth.TheSiNlayereffectivelyterminatesthepropagationofthethreadingdislocationandbasalplanestackingfaultsduringa-planeGaNregrowththroughtheinterlayer,resultinginthewindowregionshrinkingfromarectangletoa"blackhole".Furthermore,strongyellowluminescence(YL)inthenonpolarplaneandveryweakYLinthesemipolarplaneontheGaNgrainisrevealedbycathodoluminescence,suggestingthatC-involveddefectsareresponsiblefortheYL.

简介：Byintroducinganimageplane,theinverseheatconductionproblemwithfreeboundaryistransformedintoonewithcompletelyknownboundary,whichismuchsimplertohandle,asaby-product,theclassicalKrichhoff'stransformationforaccountingforvarialbleconductivityisrederivedandaninvarianceproertyoftheinverseproblemsolutionwithrespecttovariableconductivityisindicated.Thenapairofcomplementaryextremumprinciplesareestablishedontheimageplane.providingasoundtheoreticalfoundationfortheRitz'smethodandfiniteelementmethod(FEM),AnexamplesolvedbyFEMisalsogiven.

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简介：由启用在大多数材料的机能上地相关的长度规模探查lightmatter相互作用，近地的光成像和光谱学存取与另外的方法是不能得到的信息。无孔的技术的来临，它利用ultralocalized并且提高近地由突然地金属性的尖端或plasmonicnanoparticles创造了，为学习新奇材料和现象导致了近地的途径的快速的采纳，与接近亚molecular层次的空间分辨率。然而，这些途径由无孔的尖端的主导的out-of-plane极化反应通常是有限的，限制许多材料性质的探索和发现。这在为与近地的轻部件提高在里面飞机相互作用明确地设计的近地的尖端导致了最近的设计和制造突破。这微型评论在针对利用的最近的进步和新兴的方向上提供一个观点，加亮在哪儿的关键应用程序空格并且控制在里面飞机光极化近地的尖端回答启用了的在里面飞机在新nanostructured材料和设备的理解和开发的最近的前进。

简介：Thispaperdemonstratestheplanestressstateandthestressfreethermo-elasticdeformationofFGMthickplateunderthermalloading.First,theSneddon-LocketttheoremontheplanestressstateinanisotropicinfinitethickplateisgeneralizedforacaseofFGMprobleminwhichallthermo-mechanicalpropertiesareoptionalfunctionsofdepthco-ordinate.TheproofisbasedonapplicationoftheIljushinthermo-elasticpotentialtodisplacementtypesystemofequationsthatreducesittotheplanestressstateproblem.Thenanexistenceofthepurelythermaldeformationisprovedintwoways:first,itisshownthattheuniquesolutionfulfilsconditionsofsimultaneousconstanttemperatureandlineargradationofthermalexpansioncoefficient,second,proofisbaseddirectlyonstresstypesystemofequationswhichstraightforwardlyreducestocompatibilityequationsforpurelythermaldeformationifonlystressfieldishomogeneousindomainandatboundary.Finally,coupleexamplesofapplicationtoanengineeringproblemarepresented.

简介：Usingfirst-principlescalculations,wesystematicallystudythedissociationsofO2moleculesondifferentultrathinPb（111）films.AccordingtoourpreviousworkrevealingthemolecularadsorptionprecursorstatesforO2,wefurtherexplorewhytherearetwonearlydegenerateadsorptionstatesonPb（111）ultrathinfilms,butnoprecursoradsorptionstatesexistingatallonMg（0001）andAl（111）surfaces.Thereasonisconcludedtobethedifferentsurfaceelectronicstructures.FortheO2dissociation,weconsiderboththereactionchannelsfromgas-likeandmolecularlyadsorbedO2molecules.WefindthattheenergybarrierforO2dissociationfromthemolecularadsorptionprecursorstatesisalwayssmallerthanthatfromO2gas.ThemostenergeticallyfavorabledissociationprocessisfoundtobethesameondifferentPb（111）films,andtheenergybarriersarefoundtobeinfluencedbythequantumsizeeffectsofPb（111）films.

简介：Weinvestigatethethree-dimensional(3D)scatteringproblemofanincidentplaneshearhorizontalwavebyapartlythrough-thicknessholeinanisotropicplate,inwhichtheLambwavemodesarealsoincludedduetothemodeconversionsbythescatteringobstacleinthe3Dproblem.AnanalyticalmodelispresentedsuchthatthewavefieldsareexpandedinallofpropagatingandevanescentSHmodesandLambmodes,andthescatteredfar-fieldsofthreefundamentalguidedwavemodesareanalyzednumericallyfordifferentsizesoftheholesandfrequencies.ThenumericalresultsareverifiedbycomparingwiththoseobtainedbyusingtheapproximatePoisson/Mindlinplatemodelforsmallholeradiusandlowfrequency.ItisalsofoundthatthescatteringpatternsaredifferentfromthoseoftheSOwaveincidence.Ourworkisusefulforquantitativeevaluationoftheplate-likestructurebyultrasonicguidedwaves.

简介：TheBrenner-LJpotentialisadoptedtodescribetheinteractionbetweenC36clustersanddiamondsurface,andthedepositionmechanismofmulti-C36clustersonthediamondsurfaceisalsostudiedbyusingthemethodofmoleculardynamicssimulation.Thesimulationresultsshowthatthecompetitioneffectsoftwointeractions,i.e.theinteractionbetweenclusterandclusterandtheinteractionbetweenclusterandcrystalplane,arestudied,andthentheinfluenceofthesecompetitioneffectsonC36clusterdepositionisanalysed.Thefindingisthatwhenanincidentenergyisappropriatelychosen,C36clusterscanbechemicallyadsorbedanddepositedsteadilyonthediamondsurfaceintheformofsingle-layer,andinthedepositionprocessthemulti-C36clusterspresentaphenomenonofenergytransmission.Theexperimentalresultshowsthatatatemperatureof300K,inordertodepositC36clustersintoasteadynano-structuredsingle-layeredfilm,theoptimalincidentenergyisbetween10and18eV,iftheincidentenergyislargerthan18eV,theC36clusterswillbedepositedintoanislandnano-structuredfilm.

简介：ThemorphologyeffectofZr-dopedCeO2wasstudiedintermsoftheiractivitiesintheselectiveoxidationofstyrenetostyreneoxideusingtert-butylhydroperoxideastheoxidant.Inthepresentwork,ZrdopedCeO2nanorodsexhibitedthehighestcatalyticperformance（yieldofstyreneoxideandTOFvalue）followedbynanoparticlesandnanocubes.FortheZr-dopedCeO2nanorods,theapparentactivationenergyis56.3kJ/mol,whichismuchlowerthanthevaluesofcatalystssupportedonnanoparticlesandnanocubes（73.3and93.4kJ/mol）.Thehighresolutiontransmissionelectronmicroscopyresultsindicatedthat（100）and（110）crystalplanesarepredominantlyexposedforZr-dopedCeO2nanorodswhile（100）and（111）fornanocubes,（111）fornanoparticles.TheremarkablyincreasedcatalyticactivityoftheZrdopedCeO2nanorodsismainlyattributedtothehigherpercentageofCe3+speciesandmoreoxygenvacancies,whichareassociatedwiththeirexposed（100）and（110）crystalplanes.Furthermore,recyclingstudiesprovedthattheheterogeneousZr-dopedCeO2nanorodsdidnotloseitsinitialhighcatalyticactivityafterfivesuccessiverecycles.