简介:Asingle-particlemicrobeamfacilityhasbeenconstructedattheLaboratoryofIonBeamBioengineering(LIBB),ChineseAcademyofSciences.Thesystemisdesignedtodeliverthedefinednumberofhydrogenions,coveringarangeofenergyfrom1.0to3.5MeV,intoanareasmallerthanthenucleiofindividuallivingcells.AccuracyoftheparticledetectionsystemandthecelltargetingsysteminthefacilityhasbeenassessedusingCR39(nucleartrackdetector)for2.3MeVprotons.Theresultsdemonstratethattheparticledetectionefficiencyisabove98%,andtheoveralltargetingaccuracyofthemicrobeamislimitedwithin3μmformorethan90%hits.
简介:Thispaperdealswithamethodologyforsinglegatelocationoptimizationforplasticinjectionmold.Theobjectiveofthegateoptimizationistominimizethewarpageofinjectionmoldedparts,becausewarpageisacrucialqualityissueformostinjectionmoldedpartswhileitisinfluencedgreatlybythegatelocation.Featurewarpageisdefinedastheratioofmaximumdisplacementonthefeaturesurfacetotheprojectedlengthofthefeaturesurfacetodescribepartwarpage.Theoptimizationiscombinedwiththenumericalsimulationtechnologytofindtheoptimalgatelocation,inwhichthesimulatedannealingalgorithmisusedtosearchfortheoptimum.Finally,anexampleisdiscussedinthepaperanditcanbeconcludedthattheproposedmethodiseffective.
简介:TheangledependenceofopticalphononmodesofanAlNbulksinglecrystalfromthem-plane(1100)andc-plane(0001)surfaces,respectively,isinvestigatedbypolarizedRamanspectroscopyinabackscatteringconfigurationatroomtemperature.CorrespondingRamanselectionrulesarederivedaccordingtomeasuredscatteringgeometriestoillustratetheangledependence.Theangle-dependentintensitiesofphononmodesarediscussedandcomparedtotheoreticalscatteringintensities,yieldingtheRamantensorelementsofA1(TO),E22,E1(TO),andA1(LO)phononmodesandtherelativephasedifferencebetweenthetwocomplexelementsofA1(TO).Furthermore,theRamantensorofwurtziteAlNiscomparedwiththatofwurtziteZnOreportedinpreviouswork,revealingtheintrinsicdifferencesoflatticevibrationdynamicsbetweenAlNandZnO.
简介:Anewapproachbasedonmultiwaveletstransformationandsingularvaluedecomposition(SVD)isproposedfortheclassificationofimagetextures.LowersingularvaluesaretruncatedbasedonitsenergydistributiontoclassifythetexturesinthepresenceofadditivewhiteGaussiannoise(AWGN).Theproposedapproachextractsfeaturessuchasenergy,entropy,localhomogeneityandmax-minratiofromtheselectedsingularvaluesofmultiwaveletstransformationcoefficientsofimagetextures.Theclassificationwascarriedoutusingprobabilisticneuralnetwork(PNN).Performanceoftheproposedapproachwascomparedwithconventionalwaveletdomaingraylevelco-occurrencematrix(GLCM)basedfeatures,discretemultiwaveletstransformationenergybasedapproach,andHMMbasedapproach.Experimentalresultsshowedthesuperiorityoftheproposedalgorithmswhencomparedwithexistingalgorithms.
简介:Effectsofpressureand/ormagnetismonthecriticalsuperconductingtemperature(Tc)ofδ-MoNsinglecrystalwereinvestigatedusingaMaglabsystem.Theδ-MoNsinglecrystalwassynthesizedatextremeconditionsofhighpressureandhightemperature.Thecarrierdensityofδ-MoNsinglecrystalasafunctionofappliedpressurewasdeterminedusingHallcoefficientmeasurement.
简介:Anopposite-chirpedfrequency-domainopticalparametricamplification(OC-FOPA)designisdemonstratedandnumericallyverified.Thisschemecombinesbothanultrabroadseedinggenerationandthesubsequenteffectiveamplificationinonesingleopticalparametricamplificationstage.Basedonaslightlyasymmetrical4-fopticalsystem,thespectralcontentsofbothpumpandsignalwavesarespectrallydispersedwithoppositespatialchirps,tobroadentheinitialidlerseeding.Viaaproperlydesignedfan-outperiodicallypoledLiNbO3chip,nearlyperfectquasiphasematchingcanberealizedacrossthefullspectrum,wherebyeachindividualspectralpairpreciselymapstoitsrequiredgratingperiod.Full-dimensionalsimulationsbasedoncommercial110fs(FWHM)nearinfrared(near-IR)lasersat790and1030nmarequantitativelydiscussed,andfew-cyclemid-IRlaserpulses(60fsat3.4μm)plusahighconversionefficiencyexceeding50%aretheoreticallypredicted.Bymeansofahigh-powerpumpsource,theOC-FOPAschemecanbealsoappliedtodirectlyproducehigh-intensitycarrier-envelope-phase-stabilizedmid-IRidlerpulses.