简介：Wepresenttheworkflowofthedesign,realizationandtestingofdeformablemirrorssuitableforhighpowerdiodepumpedsolid-statelasers.Itstartswiththestudyoftheaberrationtobecorrected,andthenitcontinueswiththedesignoftheactuatorspositionandcharacteristic.Inthispaper,wepresentandcomparethreedeformablemirrorsrealizedformulti-Jlevellaserfacilities.Weshowthatwiththesamedesignconceptitispossibletorealizedeformablemirrorsforothertypesoflasers.Asanexample,wereporttherealizationofadeformablemirrorforfemtosecondlasersandforaCWCO2laser.

简介：Inadaptiveoptics(AO)system,thephasecompensationcapabilityislimitedgreatlybytheactuatornum-berofthedeformablemirror(DM).TheactuatornumberofDMismainlyrestrictedbythemanufacturetechniques.ThespatialcorrectioncapabilityofAOsystemcanbeimprovedbytwoormorecombinational-DMs(CDMs)withconjugationrelationship.TheCDMAOsystemforwavefrontcorrectionisbuilt,whichconsistsoftwo32-elementDMs.Theexperimentalresultsareinagreementwiththenumericalsimulationresults.ItisindicatedthattheCDMAOsystemprovidesbettercorrectionperformancethanthesingle32-elementDMAOsystem.

简介：Inthispaper,wepresentanewdeformablemodelforshapesegmentation,whichmakestwomodificationstotheoriginallevelsetimplementationofdeformablemodels.Themodificationsaremotivatedbydifficultiesthatwehaveencounteredinapplyingdeformablemodelstosegmentationofmedicalimages.Thelevelsetalgorithmhassomeadvantagesovertheclassicalsnakedeformablemodels.However,itcoulddeveloplargegapsintheboundaryandholeswithintheobjects.Suchboundarygapsandholesofobjectscancauseinaccuratesegmentationthatrequiresmanualcorrection.Theproposedmethodinthispaperpossessesaninherentpropertytodetectgapsandholeswithintheobjectwithasingleinitialcontourandalsodoesnotrequirespecificinitialization.Thefirstmodificationistoreplacetheedgedetectorbysomeareaconstraint,andthesecondmodificationutilizesweightedlengthconstrainttoregularizethecurveunderevolution.Theproposedmethodhasbeenappliedtobothsyntheticandrealimageswithpromisingresults.

简介：ThetraditionalorientedFASTandrotatedBRIEF(ORB)algorithmhasproblemsofinstabilityandrepetitionofkeypointsanditdoesnotpossessscaleinvariance.Inordertodealwiththesedrawbacks,amodifiedORB(MORB)algorithmisproposed.Inordertoimprovetheprecisionofmatchingandtracking,thispaperputsforwardanMOKalgorithmthatfusesMORBandKanade-Lucas-Tomasi(KLT).ByusingKalman,theobject’sstateinthenextframeispredictedinordertoreducethesizeofsearchwindowandimprovethereal-timeperformanceofobjecttracking.TheexperimentalresultsshowthattheMOKalgorithmcanaccuratelytrackobjectswithdeformationorwithbackgroundclutters,exhibitinghigherrobustnessandaccuracyondiversedatasets.Also,theMOKalgorithmhasagoodreal-timeperformancewiththeaverageframeratereaching90.8fps.

简介：ThispaperproposesageometricallynonlineartotalLagrangianGalerkinmeshfreeformulationbasedonthestabilizedconformingnodalintegrationforefficientanalysisofsheardeformablebeam.Thepresentnonlinearanalysisencompassesthefullygeometricnonlinearitiesduetolargedeflection,largedeformationaswellasfiniterotation.Theincrementalequilibriumequationisobtainedbytheconsistentlinearizationofthenonlinearvariationalequation.TheLagrangianmeshfreeshapefunctionisutilizedt...

简介：Thedeformablemirrorwiththesizeof410mmstackswasdeveloped.Theresults×468mmcontrolledbythebimorphpiezoceramicplatesandmultilayerpiezoceramicofthemeasurementsoftheresponsefunctionsofalltheactuatorsandofthesurfaceshapeofthedeformablemirrorarepresentedinthispaper.ThestudyofthemirrorwithaFizeauinterferometerandaShack–Hartmannwavefrontsensorhasshownthatitwaspossibletoimprovetheflatnessofthesurfacedowntoaresidualroughnessof0.033μm(RMS).Thepossibilityofcorrectionoftheaberrationsinhigh-powerlaserswasnumericallydemonstrated.

简介：我们第一建议并且示威能与150mm的一种横梁尺寸改正petwattTi:sapphire激光系统的波前的一条新节俭的途径。由与50mm使用一面可变形的镜子活跃的孔最后激光，焦点的点尺寸有效地被减少。试验性的结果证明新途径从一个技术、节俭的点简单、更少昂贵、有效。这种技术能被使用与一个更小的孔改正一根大光横梁的波前可变形的镜子。

简介：Undertheeffectsofelectricfieldandchemicalreaction,theproblemofdispersionofaerosolsinapoorlyconductingfluidinachannelissolvedanalyticallyusingthemixturetheorytogetherwitharegularperturbationtechnique.Itisshownthattheaerosolsaredispersedrelativetoaplanemovingwiththemeanspeedofatmosphericfluidaswellasthemeanspeedofagglomerationofaerosolwitharelativediffusioncoefficient,calledtheTaylordispersioncoefficient.Thiscoefficientisnumericallycomputedandtheresultsrevealthatitincreaseswithanincreaseintheelectricnumber,butdecreaseswithincreasingporousparameter.Thephysicalexplanationsforthephenomenaaregiveninthisarticle.

简介：Fromthemixedvariationalprinciple,bytheselectionofthestatevariablesanditsdualvariables,theHamtltoniancanonicalequationforthedynamicanalysisofsheardeformableantisym-metricangle-plylaminatedplatesisderived,leadingtothemathematicalframeofsymplecticgeometryandalgorithms,andtheexactsolutionforthearbitraryboundaryconditionsisalsoderivedbythead-jointorthonormalizedsymplecticexpansionmethod.Numericalresultsarepresentedwiththeemphasisontheeffectsoflength/thicknessratio,arbitraryboundaryconditions,degreesofanisotropy,numberoflayers,ply-anglesandthecorrectedcoefficientsoftransverseshear.

简介：

简介：Adaptiveoptics(AO)systemsgreatlyimprovetheresolutionofretinalimaginginstrumentsbyactivelycorrectingocularaberrations.InthisLetter,closed-loopcorrectionaswellasocularaberrationcompensationofa62-elementsiliconunimorphdeformablemirror(DM)drivenbyonlypositivevoltageisperformed.Theexperimentalresultsshowthattheroot-meansquare(RMS)wavefrontoftheinitialmirrorsurfaceisreducedto0.011μminaclosed-loopAOsystem.TheDMreproducesZernikeshapesfromthethirdto35thmodeaccurately.Thesimulatedcompensationof200ocularwavefrontsshowsthattheaverageRMSvalueaftercorrectionisreducedto0.017μm.

简介：Inthisworkweconsidertheproblemofshapereconstructionfromanunorganizeddatasetwhichhasmanyimportantapplicationsinmedicalimaging,scientificcomputing,reverseengineeringandgeometricmodelling.ThereconstructedsurfaceisobtainedbycontinuouslydeforminganinitialsurfacefollowingthePartialDifferentialEquation(PDE)-baseddiffusionmodelderivedbyaminimalvolume-likevariationalformulation.Theevolutionisdrivenbothbythedistancefromthedatasetandbythecurvatureanalyticallycomputedbyit.Thedistancefunctioniscomputedbyimplicitlocalinterpolantsdefinedintermsofradialbasisfunctions.SpacediscretizationofthePDEmodelisobtainedbyfiniteco-volumeschemesandsemi-implicitapproachisusedintime/scale.Theuseofalevelsetmethodforthenumericalcomputationofthesurfacereconstructionallowsustohandlecomplexgeometryandevenchangingtopology,withouttheneedofuser-interaction.Numericalexamplesdemonstratetheabilityoftheproposedmethodtoproducehighqualityreconstructions.Moreover,weshowtheeffectivenessofthenewapproachtosolveholefillingproblemsandBooleanoperationsbetweendifferentdatasets.

简介：Inthisarticle,thermovibrationanalysisoffunctionallygraded(FG)nanobeamssubjectedtolinearanduniformtemperaturedistributionisstudied.Thestructureismodelledbynewefficientshearbeamtheoryconsideringtheeffectofsheardeformationwithoutshearcorrectionfactor.Thementionedtheorysatisfiesthezeroboundarytractionconditionsonthebeamsurfacesandcanbeusedfortransverseshearstrainstrigonometricdistribution.Materialpropertiesofthenanostructureareassumedtemperature-dependentandFGbasedonthedistributionofpowerlaw.TheinfluenceofsizescaleiscapturedutilisingEringentheoryofnon-localelasticity.