简介:Stimulatedemissiondepletion(STED)microscopyisoneoffar-fieldopticalmicroscopytechniquesthatcanprovidesub-diffractionspatialresolution.ThespatialresolutionoftheSTEDmicroscopyisdeterminedbythespeciallyengineeredbeamprofileofthedepletionbeamanditspower.However,thebeamprofileofthedepletionbeammaybedistortedduetoaberrationsofopticalsystemsandinhomogeneityofaspecimen’sopticalproperties,resultinginacompromisedspatialresolution.Thesituationgetsdeterioratedwhenthicksamplesareimaged.Intheworstcase,theseveredistortionofthedepletionbeamprofilemaycausecompletelossofthesuperresolutioneffectnomatterhowmuchdepletionpowerisappliedtospecimens.Previouslyseveraladaptiveopticsapproacheshavebeenexploredtocompensateaberrationsofsystemsandspecimens.However,itisdifficulttocorrectthecomplicatedhigh-orderopticalaberrationsofspecimens.Inthisreport,wedemonstratethatthecomplicateddistortedwavefrontfromathickphantomsamplecanbemeasuredbyusingthecoherentopticaladaptivetechnique.Thefullcorrectioncaneffectivelymaintainandimprovespatialresolutioninimagingthicksamples.
简介:Inthispaper,theperformancecharacteristicsofASTMA19QS31803andASTMA1S2F51duplexstainlesssteelwereintroduced,andtheweldabilitieswereanalyzed.Theweldingrepairproceduresofthickwallduplexstainlesssteelweredevelopedbyweldingprocedurequalification.Researchshowsthattherepairweldinghaslesseffectonmechanicalpropertiesofweldedjointsandgreatinfluenceonphaseproportionsandpittingcorrosionresistance.Thetestresultsmeettherequirementsofprojectspecifications.Therepairweldingprocedurecanbeusedinproject,andonlyonetimerepairshallbeused.