简介：TwogradesofDyneema~?compositelaminateswiththecommercialdesignationsofHB26andHB50werecutintoblockswithorwithoutanedgecrackandcompressedinthelongitudinalfiberdirection.Thecrackedanduncrackedspecimensshowsimilarcompressiveresponsesincludingfailurepatternandfailureload.ThetwogradesofDyneema~?compositesexhibitsdifferentfailuremodes:adiffuse,sinusoidalbucklingpatternforDyneema~?HB50duetoitsweakmatrixconstituentandakinkbandforDyneema~?HB26duetoitsrelativelystrongermatrixconstituent.AneffectivefiniteelementmodelisusedtosimulatethecollapseofDyneema~?composites,andthesensitivityoflaminatecompressiveresponsestotheoveralleffectiveshearmodulus,interlaminarshearstrength,thicknessandimperfectionangleareinvestigated.Thechangeoffailuremodefromkinkbandtosinusoidalbucklingpatternbydecreasingtheinterlaminarshearstrengthisvalidatedbythefiniteelementanalyses.

简介：Withtheadventofleft-handedmagneticmaterials,itisdesirabletodevelophigh-performancewavedevicesbasedontheirnovelpropertiesofwavepropagation.Thisletterreportsthespecialpropertiesofelasticwavepropagationinmagnetoelasticmultilayeredcompositeswithnegativepermeabilityascomparecdtothoseincounterpartstructureswithpositlvepermeability.Thesenovelpropertiesofelasticwavesarediscernedfromthediversifieddispersioncurves,whichrepresentthepropagationandattenuationcharacteristicsofelasticwaves.Tocomputethesedispersioncurves,themethodofreverberation-raymatrixisextendedfortheanalysisofelasticwavesinmagnctoelasticmultilayeredcomposites.Althoughonlytheresultsofasinglepiezomagneticandabinarymagnetoelasticlayerswithmechanicallyfreeandmagneticallyshortsurfacesaswellaspelrfectinterfaceareillustratedinthenumericalexamples,theanalysisisapplicablelomagnetoelasticmultilayeredstructureswithotherkindsofboundaries/interfaces.

简介：

简介：AseriesofxNiAl2O4/γ-Al2O3compositeswithvariousNicontentshavebeenpreparedviaone-steppartialhydrolysisofmetalnitratesaltsintheabsenceofsurfactantsandusedforcarbondioxidereformingofmethane.ThecharacterizationresultsdemonstratedthattheNiAl2O4/γ-Al2O3materialspossessedmesoporousstructuresofuniformporesizes;andtheNi2+ionswerecompletelyreactedwithaluminatoNiAl2O4spinelinthematricesusingN2sorption,XRD,TEM,andXPS.TheNiAl2O4/γ-Al2O3materialsexhibitedexcellentcatalyticpropertiesandsuperiorlong-termstabilityforcarbondioxidereformingofmethane.TheeffectsofNicontentontheintrinsicactivitiesandtheamountsofcokedispositionofthexNiAl2O4/γ-Al2O3catalystswerediscussedindetailforthecarbondioxidereformingofmethane.TheresultsrevealedthattheNiparticlesizesdidnotaffecttheintrinsicactivityofmetallicNi,butsmallerNiparticlescouldreducetherateofcokedeposition.

简介：Amine-silicacompositematerialsforpost-combustionCO2capturehaveattractedconsiderableattentionbecauseoftheirhighCO2uptakeatlowCO2concentrations,excellentCO2captureselectivityinthepresenceofmoisture,andlowerenergyrequirementsforsorbentregeneration.Thisreviewdiscussestherecentadvancesinamine-silicacompositesforCO2capture,includingadsorbentpreparationandcharacterization,CO2captureunderdryandmoistureconditionsatdifferentCO2partialpressures,sorbentregeneration,andstabilityaftermanycyclicsorption-desorptionruns.

简介：我们为说明唯一的结构和磷灰石蛋白质composites的技工性质的atomicto中央规模过程的探索考察衔接规模的模拟研究。当如此的复杂biocomposites的原子结构和作文仅仅部分被知道，我们的建模研究的第一部分(i)被奉献给无机器官的composites的现实主义的水晶成核情形。从单个离子，从主题形成的机制的最近的卓见范围，成熟反应和nanocrystals的组织工会的协会开始，包括他们有控制生长的分子的一半的相互影响。在这个基础上，(ii)可靠的造为没有偏见的按比例增加裁定模型能被导出为体积材料建模。这被例示为(像瓷釉)磷灰石蛋白质composites，包含直到106原子当模特儿提供10nm长度规模的一篇现实主义的报道，虽然模型变粗被用来到达m，长度可伸缩。在这个基础上，一系列变丑和破裂模拟研究被执行并且帮助文饰biocomposite坚硬，粘性，坚韧，self-healing和破裂机制。补充试验性的工作，这些建模研究提供特别地详细的卓见进层次合成结构和有利机械性质的关系。

简介：钡锶铝矽酸盐(BSAS)和Si/BSAS涂层经由一个二拍子的圆舞激光cladding过程在C/SiCcomposites的表面上被制作。微观结构，机械性质，和样品的水蒸汽腐蚀行为被调查。BSAS涂层被发现紧被结合到底层和仅仅一些毛孔，microcracks被观察。硅中间层的介绍被揭示减少热应力并且支持在激光cladding过程期间形成的缺点愈合。为了评估腐蚀抵抗，BSAS和Si/BSAS-coated，C/SiCcomposites暴露于50%H2在1250敢椠?慦桳潩的O和50%O2吗？

简介：Flyashfloatingbead(FAFB)wasmodifiedbythenonionicsurfactantpolyethyleneglycol(PEG)undervariousconcentrationstoimproveitshydrophobility,andthenPEGmodifiedFAFBcompositedwithpolyaniline(FAFB-PEG/PAn)byemulsionpolymerizationmethodusingdifferentfeedratiosofFAFBPEG.Thechemicalstructure,phasestructure,microstructure,conductivity,anddielectricpropertieswerestudiedbyFT-IR,XRD,SEM,four-probetechnique,andLCRdigitalbridge,respectively.ItwasdemonstratedthattheoptimalconcentrationofPEGwas1mol/Landthecorrespondinggraftingratiowas1.42%.ThephasestructureofFAFBwasnotdestroyedaftermodificationbyPEG,whilethesurfacebecamesmootherandcouldbecoatedbyPAnsuccessfullyaccordingtoSEMtechnique.ComparedtothatofdodecylbenzenesulfonicaciddopedPAn(PAn-DBSA),theconductivityofFAFB-PEG/PAnwasdecreasedby10-100timesafterintroductionofvariousamountsofFAFB-PEG,especiallythevaluecouldbedecreasedto0.01Scm~(-1)if50wt%ofFAFBPEGwasprovided.Additionally,thedielectricconstantandlossfactorofFAFB-PEG/PAncompositesgraduallydecreasedwithincreasingamountofFAFB-PEGinthefrequencyrangeof100KHz-2MHz,namely,thedielectricconstantcouldbestillkeptat500andcorrespondinglythelossfactordecreasedto4.7at100KHzif50wt%ofFAFB-PEGwasprovided.TheleakingcurrentphenomenonderivedfromPAn-DBSAcouldalsobeweakenedbyFAFB-PEG.

简介：纵的张力的性质原文如此有不同纤维体积部分的f/Ti-6Al-4Vcomposites被蒙特卡罗2-D模仿有限元素模型。纤维力量的随机的分发被二参数的Weibull功能表示。同时，接触元素和出生死亡元素被用来在debonding和纤维破裂以后描述界面的滑动过程(或矩阵裂开)分别地，它被子程序认识到在ANSYS-APDL(ANSYS参量的设计语言)应允了。试验性的结果证明收益应力和最终的张力的强度原文如此有增加的f/Ti-6Al-4Vcomposites增加纤维体积部分，当他们的相应紧张只是时相反。另外，几乎，一样的失败模式被获得在原文如此有各种各样的纤维体积部分的f/Ti-6Al-4Vcomposites什么时候界面砍力量被修理。最后，张力的力量由有限元素预言了分析与由全球分享负担的模型，预言了那相比本地人分享负担的模型和混合物的常规统治，因此画结论那个本地分享负担的模型为最终的张力的力量的预言是很完美的。

简介：nano石墨表/氧化铝composites被一个灵巧的受精减小过程在situ准备。composites的微观结构被X光检查衍射(XRD)分析，并且在减小以后的最后的阶段作文是艾尔2O3,金属Fe和石墨水晶。扫描电子显微镜学(SEM)图象证明Fe的粒子尺寸是大约20?nm，和石墨的lamellae厚度是大约30?nm。然后，绝缘的性质和composites的传导性的机制在0.01-1.00的频率范围试验性地被调查?由阻抗分析器的GHz。composites的介电常数的真实部分与Fe3+集中增加的结果表演，由于在Fe和艾尔23和薄片状的石墨形成的三维的网络。因此，悦耳的microtopography和nano石墨表/氧化铝composites的电的参数能被改变Fe3+集中认识到。

简介：Inthisstudy,C_f/AlcompositesandTiAlalloyswerejoinedbyanewmethodnamedlaser-ignitedselfpropagatingsynthesis(SHS).Mixedpowdersof63.0Ni-31.9Al-5.1Ti(wt%)wereusedasjoininginterlayer.Perfectjointwasgot.ThemicrostructureevolutionandformationmechanismoftheSHSjointwereinvestigatedbyscanningelectronmicroscopy(SEM),energy-dispersivespectroscopy(EDS)andX-raydiffraction(XRD).Resultsshowthatlocalizedmeltingoccursonbothsides.Oneγ-Ni_(0.35)Al_(0.30)Ti_(0.35)andtwoNi-Alreactionlayersform,respectively,intheTiAl/interlayerandC_f/Al/interlayerinterfaces.ThecombustionofNi-Al-TiinterlayerbeginswiththesharpreactionofNiandAl.TheinterlayerproductisaeutecticorganizationofNiAlandAl-richγ.

简介：

简介：