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简介：Anondivergentbarotropicmodel(Model1)andabarotropicprimitiveequationvortexmodel(Model2)arelinearizedrespectivelyinthispaper.Thentheirperturbationwavespectrumsarecomputedwithanormalmodeapproachtostudytheinstabilityproblemonanappointedtropicalcyclone(TC)-likevortex,thereby,thedynamicinstabilitypropertiesofspiralcloudbandsofTCsarediscussed.Theresultsshowthattheunstablemodeofbothmodelsexhibitsaspiralband-likestructurethatpropagatesawayfromthevortexoutsidetheradiusofmaximumwinds.ThediscretemodalinstabilityofthepurevortexRossbywavecanaccountforthegenerationoftheeyewallandtheinnerspiralband.TheunstablemodeinModel2hasthreeparts,i.e.,eyewall,innerandouterspiralbands.ThismodecanbeinterpretedasamixedvortexRossby-inertiagravitationalwave.TheunbalancedpropertyofthewaveoutsidethestagnationradiusofthevortexRossbywaveisoneoftheimportantreasonsfortheformationoftheouterspiralbandinTCs.Accordingly,theouterspiralbandcanbeidentifiedtopossesspropertiesofaninertial-gravitationalwave.Whentheformationofunstableinnerandouterspiralbandsisstudied,abarotropicvortexmodelshallbeused.Inthismodel,themostunstableperturbationbearstheattributesofeitherthevortexRossbywaveortheinertial-gravitationalwave,dependingonthevortexradius.Sosuchperturbationsshallbeviewedasanunbalancedandunstablemixedwaveofthesetwokindsofwaves.

简介：Surfaceoriginatedkinkbandsconsistofanimportantfailuremodeforfibre-reinforcedcompo-sitesundercompression.Themechanicalbehaviorofthefibrebridgingkinkbandsisexploredhereininthecontextofthepost-microbucklingtheory.Expressionsofbridgingforceareobtainedfortheentirepostbucklingprocessofthefibresexhibitingweakorstronghardening.Thepostbucklingformulationofthefibresisappliedtoyieldthetoughnessincrementduetotheadvancingkinkbands,andconsequentlyleadstoaquantitativepre-dictionontheoverallcompressivestressstraincurvesofthefibre-reinforcedcomposites.

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简介：这研究试图在极的运动上学习大气、海洋的刺激的影响。电源光谱密度分析大气、海洋的刺激的效率不仅在不同频率而且在retrograde和与其他天体作同方的部件不同的表演，但是大气、海洋的刺激的和与观察刺激显示出最好的协议。

简介：用U.S.National，环境预言/公民的中心在1湯挠獡?桔?敲?瑬?桳睯摥琠慨?桴牥?獩愠挠楲楴慣?楤瑳湡散搠?潦?体噄?为大气的研究分析数据集中湩戠牡'覙H楮?瑡潭灳敨敲圮敨?桴?楤瑳湡散戠瑥敷湥猠灥牡瑡摥瘠牯楴散?獩猠慭汬牥琠慨?牯攠畱污琠?绥鳟彌B?潶瑲捩獥猠汥?牯慧楮敺椠Ь

简介：基于飞机波浪方法，有在x-y飞机的45°的全部格子旋转的木柴堆结构photonic水晶的完全的禁止的乐队的光性质理论上以height-to-pitch比率，充满的因素，和旋转角度被学习。计算结果证明到中间差距的比率的差距随着充满的部分从0.25～0.30稍微变化。最佳height-to-pitch比率是大约1.3。当旋转角度与1.3的经常的height-to-pitch比率从42°从40°增加到50°和最大的差距到为旋转角度未改变的0.2个遗体的中间差距的比率到48°时，到中间差距的比率的差距到达超过0.18。当height-to-pitch比率是1.3时，到中间差距的比率的差距到达0.2的最大的价值。这木柴堆类型photonic晶体能在一个更宽的参数范围以内提供大乐队差距，它使在实验室生产三维的photonic晶体方便。

简介：Pure-Ge/Sishortperiodsuperlattice(SPS)grownbygassourceMBE(GSMBE)isstudiedbyphotoluminescencespectroscopyandRamanscatteringspectroscopy.AnabnormalbandinphotoluminescenceisfoundinanintermediaterangeofLsibetween1.9nm-2.9nmforsampleswithLgefixedat1.5ml.Incontrasttoapure-Ge/Siquantumwell,theenergyofthebandshowsred-shiftasLsiincreases.RamanscatteringshowsthatSi-SivibrationrelatedRamanshiftreachesaminimumforsampleswithstrongestPLintensityoftheabnormalband.Itisthereforeconcludedthattheabnormalbandisrelatedwithstrainrelaxationprocess.

简介：Undertheframeworkofsupportvectormachines,thispaperproposesanewkernelmethodbasedonneighborbandsmutualinformationforhyperspectraldatumclassification.Thisalgorithmassignsweightstodifferentbandsinthekernelfunctionaccordingtotheamountofusefulinformationthattheycontain,whichmakesthebandwithmoreusefulinforma-tionplaymoreimportantroleintheclassification.Ourresearchhasshownthatthebandwithgreatermutualinformationbetweenneighborbandscontainsmoreusefulinformation,andhenceweusethemutualinformationofeachbandanditsneighborbandsastheweightsoftheproposedkernelmethod.Theexperimentalresultsshowthatforthesupportvectormachinesbasedonpolynomialandradialbasisfunction,afterintroducingtheproposedkernelfunction,theaverageaccuracyisincreasedmorethan1.2%withoutusinganyreferencemaporincreasingmuchmorecomputationaltime.

简介：ThislettermainlyaimstoinvestigatethemechanicalbehaviorwithinshearbandsinregolithbothundertheEarthandtheMoonconditionsviathedistinctelementmethod,inwhichanovelcontactmodelconsideringinterparticlevanderWaalsforcesandrollingresistanceisemployed.Theresultsshowthatforregolithunderbothconditionsthestresspathsarealmostidenticalinsideandoutsidetheshearbandsbutvoidratio,averagepurerotationrate,andstrainpathsareratherdistinctwithdilation,particlerotationandthesecondinvariantofstraintensormainlyoccurringwithinthebands.However,theregolithundertheMoonconditionhashigherpeakstrengthandmoresignificantstrainlocalizationthanthoseundertheEarthcondition.更多还原

简介：Thewidthandspacingofadiabaticshearbands(ASBs)intheserratedchipsgeneratedduringhighspeedorthogonalcuttingof30CrNi3MoVstructuralsteelweremeasuredbyopticalmicroscopy(OM),thetemperatureriseintheshearbandwasestimated.ThemicrostructuresoftheASBswerealsocharacterizedbySEMandTEM.TheresultsshowthatthewidthandspacingofASBsdecreasewiththeincreaseofthecuttingspeed.ThefurtherobservationsshowthatthemicrostructurebetweenthematrixandthecenteroftheASBgraduallychanges,andthatthemartensiticphasetransformation,carbideprecipitationandrecrystallizationmayoccurintheASB.

简介：有双阶段的结构(alpha+beta)的alpha钛和它的合金在大约10~的紧张率下面动态地被使变形4s~(-1)。形成和微结构进化局部性砍乐队们被扫描电子显微镜学(SEM)和传播电子显微镜学(TEM)描绘。结果表明紧张和紧张率应该同时被看作机械条件为砍乐队形成，和twinning是变丑的一个重要模式。试验性并且在乐队以内的材料经历了的计算表演超高频率的紧张率(9X10~5s~(-1))变丑，它是平均紧张率的二大小要求了为砍乐队形成；在乐队的脱臼能被压缩并且发展成房间结构；到在乐队以内的alpha_2的阶段转变fromalpha被观察，并且转变产品(alpha_2)与他们的父母一起有某个结晶的取向关系；有在在乐队以内观察的直径的10亩m的一种平均尺寸的equiaxed谷物被建议是再结晶的结果。

简介：Numerousexperimentalevidencesshowthatthegrainsizemaysignificantlyaltertheyieldstrengthofmetals.Similarly,in-strengthenednickel-basedsuperalloys,theprecipitatesizealsoinfluencestheiryieldstrength.Then,howtodescribesuchtwokindsofsizeeffectsontheyieldstrengthisaverypracticalchallenge.Inthisstudy,accordingtoexperimentalobservations,acollinearmicro-shear-bandsmodelisproposedtoexplorethesesizeeffectsonmetalmaterials’yieldstrength.Ananalyticalsolutionforthesimplemodelisderived.Itrevealsthattheyieldstrengthisafunctionofaveragegrain-sizeorprecipitate-size,whichisabletoreasonablyexplainsizeeffectsonyieldstrength.Thetypicalexamplevalidationshowsthatthenewrelationshipisnotonlyabletopreciselydescribethegrain-sizeeffectinsomecases,butalsoabletotheoreticallyaddresstheunexplainedHall-Petchrelationshipbetweentheγprecipitatesizeandtheyieldstrengthofnickel-basedsuperalloys.

简介：Real-timevideostreamingusingultra-wideband(UWB)technologyisexperimentallydemonstratedalonglong-reachpassiveopticalnetworks(LR-PONs)withdifferentwiredandwirelessreaches.ExperimentaltestsusingexternalanddirectmodulationwithUWBwirelessradiationinthe10-and60-GHzbandsareperformed.Anultra-bendablefiberisalsoconsideredforalast-miledistribution.ThevideoqualityattheoutputoftheopticalfiberinfrastructureoftheLR-PONisassessedusingtheerrorvectormagnitude(EVM),andthelinkqualityindicator(LQI)isusedasafigureofmeritafterwirelessradiation.AnEVMbelow–17dBisachievedforbothexternallyanddirectlymodulatedLR-PONscomprisingupto125kmofopticalfiber.EVMimprovementisobservedforlongerLR-PONswhendirectlymodulatedlasers(DMLs)areusedbecauseoftheamplitudegainprovidedbythecombinedeffectofdispersionandDML’schirp.Comparedwithopticalback-to-backoperation,theLQIleveldegradestothemaximumaround20%forLR-PONsrangingbetween75and125kmoffiberreachandwithawirelesscoverageof2minthe10-GHzUWBband.ThesamelevelofLQIdegradationisobservedusingthe60-GHzUWBbandwithaLR-PONintegrating101kmofaccessnetwork,alast-miledistributionusingultra-bendablefiber,anda5.2-mwirelesslink.