简介：Statisticalshapepriormodelisemployedtoconstructthedynamicsinprobabilisticcontourestimation.Byapplyingprincipalcomponentanalysis,plausibleshapesamplesareefficientlygeneratedtopredictcontoursamples.Basedontheshape-dependentdynamicsandprobabilisticimagemodel,aparticlefilterisusedtoestimatethecontourwithaspecificshape.Comparedwiththedeterministicapproachwithshapeinformation,theproposedmethodissimpleyetmoreeffectiveinextractingcontoursfromimageswithshapevariationsandocclusion.

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

简介：ThebasicschemeoftheorientationdetectionsystemusingL-shapereticleisintroduced.Thedimensionofthepatternsonthereticleofthesysteminpracticalapplicationsisdesignedandananalysisoftheprincipleofabstractingtheorientationinformationofthetargetandtheeffectsandformationmethodofself-adaptingtrackinggateispresented.TheresearchresultshowsthattheorientationdetectionsystemusingL-shapereticlehasagoodeffectonspace-filtering,thesignalsthattheorientationdetectionsystemsendsoutareeasytobeprocessedbycomputer,itsself-adaptingtrackinggatehasastronganti-interferenceability,andthewholesystem’ssearchingandtrackingperformancesarequitehigh.

简介：Anopticalfibermagneticfieldsensorforthedual-parametersimultaneousmeasurementisproposedanddemonstrated.Thesensorheadisconstructedbyapeanut-shapestructureandlongperiodfibergrating(LPFG)coatedbymagneticfluid(MF).Theexternalmagneticfieldintensitycanbemeasuredbythevariationofcharacteristicwavelength(Dip1andDip2)ininterferencespectrumsincetheeffectiverefractiveindexofMFchangeswithexternalmagneticfieldintensity.Whentheexternalmagneticfieldintensitychangesfrom0mTto20mT,themagneticfieldsensitivitiesofDip1andDip2are-0.064nm/mTand-0.041nm/mT,respectively.ExperimentalresultsshowthatthetemperaturesensitivitiesoftheDip1andDip2are0.233nm/℃and0.186nm/°C,respectively.Therefore,thesimultaneousmeasurementofthemagneticfieldintensityandtemperatureisdemonstratedbasedonthesensitivematrix.Ithassomepotentialapplicationsinaerospace,environmentalmonitoringandmedicalsensingfields.

简介：ThediamondfilmsadherenttoSisubstratearedepositedwiththemicrowaveplasmaCVD(MPCVD)atmicrowavepowersof6000Wand4000Wfrom6hto10h,respectively,theinternalstressesofthefilmsaremeasuredbyXRD.Spectralpeakshiftandwideningareappliedtocalculatethemagnitudesofmacroandmicrostresses.Theresultsshowthatthemacrostressistensile.Theinternalstresscanbecontrolledbythemicrowavepower.Withthemicrowavepowerincreasing,theintrinsicandmacrostressesdecrease,andthemicrostressincreasessignificantly.Also,itcanbefoundthatthemacroandmicrostressesincreasewithdepositedtimewhentheotherconditionsarethesame.

简介：ThestainlessFe-Mn-Sishapememoryalloy(SMA)coatingwaspreparedonthesurfaceofAISI304stainlesssteel.Theprincipalresidualstressmeasuredbythemechanicalhole-drillingmethodindicatesthattheFe-Mn-SiSMAcladdingspecimenpossessesalowerresidualstresscomparedwiththe304stainlesssteelcladdingspecimen.Themeanstressvaluesoftheformerandthelatteron10-mm-thicksubstrateare4.751MPaand7.399MPa,respectively.What’smore,theirdeformationvalueson2-mm-thicksubstrateareabout0°and15°,respectively.Meanwhile,thevariationtrendandthevalueoftheresidualstresssimulatedbytheANSYSfiniteelementsoftwareconsistwithexperimentalresults.TheX-raydiffraction(XRD)patternshowsε-martensiteexistsinFe-Mn-SiSMAcoating,whichverifiesthemechanismoflowresidualstress.That’stheγ→εmartensitephasetransformation,whichrelaxestheresidualstressofthespecimenandreducesitsdeformationinthelasercladdingprocessing.