简介:ByaddingmixtureofZrO2andcarbon,aZr-enhancedcompositecoatingwasproducedontoanAISI1045substratebylasercladding.Themicrostructureandphaseformation,microhardnessandwearresistanceofthecompositecoatingwerestudied.Theexperimentalresultsindicatethatthecompositecoatingwithmetallurgicalbondingtosubstrateconsistsof7-Ni,massiveceramicparticlesofZrC,NiZra,NiTZr〉(Fe,Ni)23C6andF%C.Theinsitu-synthesizedZrCparticlesareuniformlydispersedincompositecoating,whichrefinesthemicrostructureofcompositecoating.WithdifferentZrO2andcarbonaddi-tions,thepropertiesareimproveddifferently.Finally,thefineinsituZrCparticlesimprovethemicrohardnessofcompositecoatingtoHVo.2650,whichisnearly2.7timesthatofNi25coating.Also,thecompositecoatinghasanadvantageinwearresistance;itoffersbetterwearresis-tancewhenmoremixtureofZrO2andcarbonwasaddedinnickelalloys.
简介:Tosimulatetherumorpropagationprocessononlinesocialnetworkduringemergency,anewrumorpropagationmodelwasbuiltbasedonactiveimmunemechanism.Therumorpropagationmechanismswereanalyzedandcorrespondingparametersweredefined.BAscalefreenetworkandNWsmallworldnetworkthatcanbeusedforrepresentingtheonlinesocialnetworkstructurewereconstructedandtheircharacteristicswerecompared.Agent-basedsimulationswereconductedonbothnetworksandresultsshowthatBAscalefreenetworkismoreconductivetospreadingrumorsanditcanfacilitatetherumorrefutationprocessatthesametime.Rumorspaidattentiontobymorepeopleislikelytospreadquickerandbroaderbutforwhichtherumorrefutationprocesswillbemoreeffective.Themodelprovidesausefultoolforunderstandingandpredictingtherumorpropagationprocessononlinesocialnetworkduringemergency,providingusefulinstructionsforrumorpropagationintervention.
简介:Theultraviolet(UV)bandedgephotorefractivityofLiNbO_3:Zrat325nmhasbeeninvestigated.Theexperimentalresultsshowthattheresistanceagainstphotorefractionat325nmisquiteobviousbutnotasstrongasthatat351nm,whenthedopingconcentrationofZrreaches2.0mol%.ItisreportedthatthephotorefractivityinothertetravalentlydopedLiNbO_3crystals,suchasLiNbO_3:HfandLiNbO_3:Sn,isenhanceddramaticallywithdopingconcentrationoverthreshold.HerewegiveanexplicitexplanationonsuchseemlyconflictingbehaviorsoftetravalentlydopedLiNbO_3,whichisascribedtothecombinedeffectofincreasedphotoconductivityandtheabsorptionstrengthofthebandedgephotorefractivecenters.
简介:Ceria-zirconiasolidsolutionhasbeenpreparedbytheureagrindcombustionandcitricacidsol-gelmethodsforcatalyticapplicationsasoxygenstorage/releasematerialsinthisstudy.Thepropertiesandoxygenstorage/releasecapacitiesofsampleswithdifferentZrcontentswerecharacterizedandevaluatedbyX-raydiffraction(XRD),N2adsorption,scanningelectronmicroscopy(SEM),Ramanspectroscopy,andinsituCO–CO2loopingtest.Theresultsdemonstratethatthesamplespreparedbytwomethodsareallofexcellentlattice[O]release/storagepropertiesandmaintaingoodlong-termcyclestability.ButthepreparationmethodsignificantlyimpactsthehomogeneityofsamplesrelatedtotheirredoxpropertiesandthecontentofZrover20%,whichgreatlychangedthepropertiesofceria-zirconiasolidsolutionsandcausedtheirchangingofcrystallinesymmetryfromcubictotetragonal.Thesamplespreparedbycitricacidsolgelmethodareofmorehomogeneousparticlesizesandhigherspecificsurfaceareasthanthatbyureagrindcombustionmethod,whichisbenefittotheoxygenreleaseratherthanoxygenstorage.ThebulkoxygenamountmigratedtosurfaceincreaseswiththeincreasingZrcontent,however,theamountoflatticeoxygenmigrationdecreaseswhenZrcontentisover20%.WhenZrcontentis20%,thedifferencesofstorage/releasecapacitiesfromtwodifferentpreparationmethodsarereducedathightemperatureinthelong-termloopreaction.
简介:WepresentthepreliminaryresultsofourcodeOPAQS(opacitycalculationusingquantumstatisticalmodel)thatisbasedontheselfconsistentHartree-Fock-Slatermodelfortheaverageatom.Thecodeiscapableofperformingrobustcalculationsofaveragechargestate,frequency-dependentandmeanopacities.Theaccuracyoftheatomicmodelisverifiedbycomparingthecalculationsofaveragechargestatewithvariouspublishedresults.ThemonochromaticopacitiesforironcomputedatdifferentsetsoftemperaturesanddensitiesarecomparedwithLEDCOP.TheRosselandandPlanckopacitiesforironandaluminumarevalidatedwithsomestate-of-the-artcodes.Theresultsareingoodagreementwiththepublisheddata.
简介:这份报纸试图介绍一种交互颜色自然图象分割方法。这个方法由使用非线性的紧缩的结构张肌(NCST)然后使用GrabCut方法获得分割提取图象的特征。这个方法不仅认识到质地信息和颜色信息的非参量的熔化,而且改进计算的效率。然后,改进GrabCut算法被用来评估前景目标分割。以便计算简洁和效率,这份报纸也扩大构造的Gaussian混合模型(GMM)到张肌空间的GrabCut上的底,和使用Kullback-Leibler(KL)分叉而不是平常的Riemannian几何学。最后,一个重复集中标准被建议与满足的分割精确性戏剧性地减少GrabCut算法的重复的时间。在在合成质地图象和自然图象上进行很多实验以后,结果证明这个方法有更精确的分割效果。
简介:我们构造稀少的表示和subspace表示的一个合作模型。首先,我们代表追踪在原则部件分析(PCA)指向subspace,然后我们采用L1规则化限制剩余学期的稀少,限制表示系数的稀少的一个L2规则化学期,并且限制在重建和目标之间的距离的一个L2标准。然后,我们在粒子过滤器框架实现算法。而且,一个反复的方法被介绍得到剩余和系数的全球最小。最后,一个其他的模板更改计划被采用避免被不精密的更改引起的追踪的飘移。在实验,我们在9个序列上测试算法,并且把结果与5个state-of-art方法作比较。根据结果,我们能断定我们的算法比另外的方法更柔韧。
简介:Basedonthesystemdynamics(SD)model,thispaperputsforwardaquantitativemethodtoevaluatetheearthquakeemergencyplaninChina.Firstly,weanalyzethedisastersystemstructureandthecontentofplan.Usingtheanalysisresults,weestablishasystemdynamics(SD)modelandthencarryoutitssimulation.Accordingtothesimulationresults,therescueeffectusingtheplanof2012isbetterthanthatof2006.Fromthepolicylevel,inordertoreduceloss,governmentshouldmaintaincommunicationsmoothly,improvetheabilityofselfandmutualhelp,strengthenthemanagementofpublicopinion,andpaymoreattentiontosecondarydisasters.
简介:在密度以内的第一原则的计算功能的理论被执行了在Ti32阶段>艾尔基于合金,Zr,Hf,和Sn(6.25at%)元素做了。格子常数,全部的精力和有弹性的常数为supercells被计算。形成热含量,体积模量,砍模量,幼仔模量,和内在的坚硬被调查。做的2阶段的韧性被Cauchy压力,G/B和泊松比率分析。结果证明由由Sn的艾尔(2n)的Zr,Hf,和替换的Ti(6h)的替换能使做的2阶段更稳定。2阶段的刚性和坚硬能被与Zr和Hf做提高,当Sn带相反的效果时。Sn是更强大的比Hf改进做的2阶段的韧性,但是Zr能增加易碎物。状态(DOS和PDOS)的密度和差别费用密度被获得揭示alloying元素的效果的内在的机制。
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.
简介:Outsidesurfacefluctuationsofinertialconfinementfusion(ICF)capsulegreatlyaffecttheimplosionperformance.Anatomicforcemicroscope(AFM)-basedprofilometerisdevelopedtopreciselycharacterizethecapsulesurfacewithnanometerresolution.Withthestandardninesurfaceprofilesandthecompletecoveragedata,1Dand2Dpowerspectraareobtainedtoquantitativelyqualifythecapsule.Capsulecenterfastaligning,orbittracesautomaticrecording,3Dcapsuleorientationhavebeenstudiedtoimprovetheaccuracyandefficiencyoftheprofilometer.
简介:信息熔化是在多模式的生物测定的系统的关键步。特征级的熔化是比由于原来的特征集合关于生物测定的数据包含更富有的信息的事实的分数级、决定级的方法更有效的。在这份报纸,我们在场当时,为特征级的多模式的生物测定的信息熔化的概括正规判别式设计(MGCDP)方法,它最大化intra班的关联展示的multiset最小化在班之间的关联。另外,连续MGCDP(S-MGCDP)和策略也是的平行MGCDP(P-MGCDP)求婚了,它能多于二种生物测定的信息熔化,以便完成更好的鉴定效果。实验在MGCDP方法超过的各种各样的生物测定的数据库表演表现了另外的最先进的特征级的信息熔化途径。
简介:Thispaperproposesanovelregistrationmethodforaugmentedreality(AR)systemsbasedonOrientedFASTandRotatedBRIEF(ORB)andFastRetinaKeypoint(FREAK)naturalfeatures.IntheproposedORBFREAKmethod,featureextractionisimplementedbasedonthecombinationofORBandFREAK,andthefeaturepointsarematchedusingHammingdistance.Togetgoodmatchingpoints,cross-checksandleastmediansquaresareusedtoperformoutlierfiltration,andcameraposeisestimatedusingthematchedpoints.Finally,ARisrendered.Experimentsshowthattheproposedmethodimprovesthespeedofregistrationtobeinrealtime;theproposedmethodcanaccuratelyregisterthetargetobjectunderthecircumstancesofpartialocclusionoftheobject;anditalsocanovercometheeffectsofrotation,scalechange,ambientlightanddistance.