简介：Thispaperpresentsaninvestigationontheself-focusing/defocusingofchirpedGaussianlaserbeamincollisionalplasmawithlinearabsorption.WehavederivedthedifferentialequationforthebeamwidthparameterbyusingWKBandparaxialapproximationsandsolveditnumerically.Theeffectofchirpandotherlaserplasmaparametersisseenonthebehaviorofbeamwidthparameterwithdimensionlessdistanceofpropagation.Theresultsarediscussedandpresentedgraphically.Oursimulationresultsshowthattheamplitudeofoscillationsdecreaseswiththedistanceofpropagation.Duetocollisionalfrequency,thelaserbeamshowsfastdivergencewhichcanbeminimizedbytheintroductionofchirpparameter.Thechirpdecreasestheeffectofdefocusingandincreasestheabilityofself-focusingoflaserbeamincollisionalplasma.

简介：Amulti-objectiveoptimizationofnon-uniformbeamsispresentedforminimumradiatedsoundpowerandweight.Thetransfermatrixmethodisusedtocomputethestructuralandacousticresponsesofanon-uniformbeamaccuratelyandefficiently.Themulti-objectiveparticleswarmoptimizationtechniqueisappliedtosearchtheParetooptimalsolutionsthatrepresentvariouscompromisesbetweenweightandsoundradiation.Severalconstraintsareimposed,whichsubstantiallyreducethevolumefractionoffeasiblesolutionsinthedesignspace.Twononuniformbeamswithdifferentboundaryconditionsarestudiedtodemonstratethemulti-objectiveoptimaldesignsofthestructure.

简介：Aconvenientanduniversalresiduecalculusmethodisproposedtostudythestochasticresponsebehaviorsofanaxiallymovingviscoelasticbeamwithrandomnoiseexcitationsandfractionalorderconstitutiverelationship,wheretherandomexcitationcanbedecomposedasanonstationarystochasticprocess,Mittag-Lefflerinternalnoise,andexternalstationarynoiseexcitation.Then,basedontheLaplacetransformapproach,wederivedthemeanvaluefunction,variancefunctionandcovariancefunctionthroughtheGreen'sfunctiontechniqueandtheresiduecalculusmethod,andobtainedtheoreticalresults.Insomespecialcaseoffractionalorderderivativeα,theMonteCarloapproachanderrorfunctionresultswereappliedtochecktheeffectivenessoftheanalyticalresults,andgoodagreementwasfound.Finallyinageneral-purposecase,wealsoconfirmedtheanalyticalconclusionviathedirectMonteCarlosimulation.

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简介：自从增强的水泥(RC)的很当前的地震能力评估，框架结构被任何一个静电干扰闲差事分析(PA)或动态时间历史分析实现，与象柱，横梁和墙的如此的主要结构的部件上的塑料绞链(PH)的多样的背景，复杂行为砍在横梁列关节(BCJ)的失败通常在主要地震期间被忽视。这研究建议新非线性的PA过程考虑砍在BCJ的失败并且寻求估计实际损坏到RC结构。基于FEMA-356的说明，由在塑料绞链的地点上斜放的二口非线性的生气神气组成的一个简化联合模型被建立，允许复杂PA被表现。为了验证这个方法，能力曲线的分析结果和失败的有效性，机制源于框架与试验性的大小相比的三不同动物完全长大的RC。由考虑砍在BCJ的失败，建议非线性的分析过程能被用来估计RC框架的结构的行为包括地震能力和关节的进步失败顺序，以一种精确、有效的方式。

简介：Supersonicmolecularbeaminjection(SMBI)wasfirstproposedanddemonstratedontheHL-1tokamak,wassuccessfullydevelopedandusedontheHL-1Mtokamak,andwasthenappliedontheHT-7superconductingtokamak,theToreSupratokamakandtheWT-ASstellarator.Withthenew

简介：Theelectronbeamwelding-brazingbeingusedtojoin5A06AlalloytoTC4Tialloydecreasestheformationofbrittleintermetalliccompound.Experimentswerecarriedouttostudytheinfluenceofelectronbeamweldingparametersonthetensilestrengthofwelds,basedonanorthogonaltestandanalysismethod.Theweldingparametersincludebeamcurrent,weldingspeed,scanningfigure,scanningfrequency,figuresize,beamoffsetandfocuscurrent.Theoptimumparametersfor3mm5A06Alalloyand2mmTC4alloywereasfollows:accelerationvoltagewas60kV,beamcurrentwas11mA,weldingspeedwas600mm/min,focuscurrentwas0mA,scanfigurewasO,scanningfrequencywas1000Hzandbeamoffsetwas0.5mm.Theresultsshowthatthejointswerewithgoodappearanceandqualityweldedbytheoptimumparameters.ThesuccessfuljointscouldbegainedandthemaximumtensilestrengthofAl/Tidissimilaralloyjointscouldbeupto222.61MPausingelectronbeamwelding-brazing.

简介：Synchrontronradiationx-rayreflectivitymeasurementisusedtostudytheconcentrationprofileofaδ-dopedErlayerinSiepitaxialfilmgrownbymolecular-beamepitaxy.Theoscillationofthereflectivityamplitudeasafunctionofreflectionangleisobservedintheexperiment.Bydoingatheoreticalsimulation.theconcentrationprofileofEratomscouldbederied.Itisshownthattheoriginallygrownδ-dopedErlayerchangesintoanexpionentiallydecayedfunctionduetotheErsegregation.Thetemperaturedependenceofthe1/edecaylengthindicatesthatthesegregationisakineticallylimitedprocess.Theactivationenergyisdeterminedtobe0.044±0.005eV.

简介：Thispaperdealswiththecapabilitiesoflinearandnonlinearbeamtheoriesinpredictingthedynamicresponseofanelasticallysupportedthinbeamtraversedbyamovingmass.Tothisend,thediscreteequationsofmotionaredevelopedbasedonLagrange’sequationsviareproducingkernelparticlemethod(RKPM).Foraparticularcaseofasimplysupportedbeam,GalerkinmethodisalsoemployedtoverifytheresultsobtainedbyRKPM,andareasonablygoodagreementisachieved.Variationsofthemaximumdynamicdeflectionandbendingmomentassociatedwiththelinearandnonlinearbeamtheoriesareinvestigatedintermsofmovingmassweightandvelocityforvariousbeamboundaryconditions.Itisdemonstratedthatformajorityofthemovingmassvelocities,thedifferencesbetweentheresultsoflinearandnonlinearanalysesbecomeremarkableasthemovingmassweightincreases,particularlyforhighlevelsofmovingmassvelocity.Exceptforthecantileverbeam,thenonlinearbeamtheorypredictshigherpossibilityofmovingmassseparationfromthebasebeamcomparedtothelinearone.Furthermore,theaccuracylevelsofthelinearbeamtheoryaredeterminedforthinbeamsunderlargedeflectionsandsmallrotationsasafunctionofmovingmassweightandvelocityinvariousboundaryconditions.

简介：新奇对称的啁啾的横梁splitter基于一个二进制燃烧栅栏被建议，它为互补金属氧化物半导体技术与当前的制造设备采用充分蚀刻的栅栏结构兼容机并且对集成和制造过程方便。这结构能在TE极化发生的条件下面认识到将近相等力量的切开的操作。当绝对正常的发生发生在1580nm的波长时，左和正确分支的联合效率分别地是43.627%和43.753%。而且，这结构在蚀刻的深度有20nm的忍耐并且3

简介：这个工作处理合并magnetorheological弹性体的机械结构的颤动的活跃控制。抑制系数并且砍弹性体增加的模量当暴露了到一个磁场时。与弹性体永久地暴露于一个磁场的颤动控制相比，整个时间的这个过程的控制更有效地减少颤动。为充满弹性体的一根三明治横梁的颤动的试验性的学习被进行，用Abaqus代码由数字研究列在后面。抑制的颤动被发现依赖于在弹性体的微尺寸的铁磁性的粒子的装载的率。

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简介：WeinvestigatethelateralshiftofaTM-polarizedlightbeamreflectedfromOttoconfigurationundergrazingincidence.Itisfoundthatthelateralshiftisstronglydependentonthethicknessoftheair-gaplayer.Byemployingthepole-nullrepresentation,wedemonstratethatthelateralshiftiscloselyrelatedtothenullofthereflectionfunction.ThenumericalsimulationsforaGaussianbeamareperformedtodemonstratethevalidityofourtheoreticalanalysis.

简介：Vortexbeamswithfractionaltopologicalcharge(FTC)havemanyspecialcharacteristicsandnovelapplications.However,oneoftheobstaclesfortheirapplicationisthedifficultyofpreciselydeterminingtheFTCoffractionalvortexbeams.WefindthatwhenavortexbeamwithanFTCilluminatesadynamicangulardoubleslit(ADS),thefar-fieldinterferencepatternsthatincludetheinformationoftheFTCofthebeamattheangularbisectordirectionoftheADSvaryperiodically.Basedonthisproperty,asimpledynamicADSdeviceanddatafittingmethodcanbeusedtopreciselymeasuretheFTCofavortexlightbeamwithanerroroflessthan5%.

简介：Inthiswork,resultsonthestudyofthestructureandphotoluminescence(PL)propertiesofSiOxNythinfilmsarepresented.Thefilmsweredepositedatroomtemperatureusingadual-ion-beamco-sputteringsystem.TheXRDandTEMresultsshowthatthedepositedfilmshaveanamorphousstructure.IntheXPSresult,wefindN1sspectraconsistofonesymmetricsinglepeakat397.8eV,indicatingthatthenitrogenatomsaremainlybondedtosilicon.ItisinagreementtotheresultofFTIR.InSiOxNyfilms,anintensesinglePLpeakat590nmisobserved.Furthermore,withtheincreaseoftheNcontentintheSiOxNyfilms,theintensityofthePLpeakat590nmincreasesalot.ThePLpeakof590nmissuggestedtooriginatefromN-relateddefects.

简介：Thispaperdealswiththefreevibrationanalysisofcircularalumina(Al2O3)nanobeamsinthepresenceofsurfaceandthermaleffectsrestingonaPasternakfoundation.ThesystemofmotionequationsisderivedusingHamilton'sprincipleundertheassumptionsoftheclassicalTimoshenkobeamtheory.Theeffectsofthetransversesheardeformationandrotaryinertiaarealsoconsideredwithintheframeworkofthementionedtheory.Theseparationofvariablesapproachisemployedtodiscretizethegoverningequationswhicharethensolvedbyananalyticalmethodtoobtainthenaturalfrequenciesofthealuminananobeams.TheresultsshowthatthesurfaceeffectsleadtoanincreaseinthenaturalfrequencyofnanobeamsascomparedwiththeclassicalTimoshenkobeammodel.Inaddition,fornanobeamswithlargediameters,thesurfaceeffectsmayincreasethenaturalfrequenciesbyincreasingthethermaleffects.Moreover,withregardtothePasternakelasticfoundation,thenaturalfrequenciesareincreasedslightly.Theresultsofthepresentmodelarecomparedwiththeliterature,showingthatthepresentmodelcancapturecorrectlythesurfaceeffectsinthermalvibrationofnanobeams.

简介：Owingtotheabsenceofproperanalyticalsolutionofcantileverbeamsforcouplestress/straingradientelas-to-plastictheory,experimentalstudiesofthecantileverbeaminthemicro-scalearenotsuitableforthedeterminationofmateriallength-scale.Basedonthecouplestresselasto-plas-ticity,ananalyticalsolutionofthincantileverbeamsisfirstlypresented,andthesolutioncanberegardedasanextensionoftheelasticandrigid-plasticsolutionsofpurebendingbeam.Acomparisonwithnumericalresultsshowsthatthecurrentanalyticalsolutionisreliableforthecaseofσ0(?)H(?)E,whereσ0istheinitialyieldstrength,HisthehardeningmodulusandEistheelasticmodulus.Fortunately,theabovementionedconditioncanbesatisfiedformanymetalmaterials,andthusthesolutioncanbeusedtodeterminethemateriallength-scaleofmicro-structuresinconjunctionwiththeexperimentofcantileverbeamsinthemicro-scale.

简介：Withtheincreasingnumberoflaserbeams,themaindifficultyinarrangingbeamguidingsystems(BGSs)involvesdeterminingthecorrespondingrelationshipsbetweentheoutputandinputportstorealizetheidentifiedlightpathlengthofallbeams.Giventhebasicconstraintsofgeometricarrangement,aBGSmodelisestablished,andabase-linealgorithmisproposedtoaddressthedifficultymentionedabove.Boundaryconditionsoftargetareaandtargetchamberarediscussedtoincreasethenumberoflaserbeams,andamaximumvalueexistsforaspecifictargetarea.Finally,thecompatibilityofacylindricalhohlraumtargetchamberwithasphericalhohlraumisanalyzed,andamoveablefinalopticsassemblyisproposedtoexecutetheswitchbetweenthetwodifferenttargets.

简介：Biooxidationhasbeensuccessfullyappliedinthefieldofrefractorygoldorepretreatment.Itreferstoaprocessthatusesacidophilicmicroorganismstooxidizeanddeterioratetheminerals,thusmakinggoldavailableforcyanidation.Acidithiobacillusferrooxidans(At.f),achemolithoautotrophic,acidophilic,moderatelythermophilicbacterium,isthemostcrucialmicroorganisminvolvedinbiooxidation.At.fcanobtainenergybyoxidizingferrousironsandreducedsulfurcompoundsintheminerals[1].Asatoxicmetalloidcarcinogen,arsenicisalwaysassociatedwithhydrothermalgolddeposits.Arsenicisfrequentlyfoundasarsenopyrite(FeAsS),realgar(As4S4),orpiment(As2S3)andinrefractorygoldores[2].

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