简介：Inthispaper,afacialfeatureextractingmethodisproposedtotransformthree-dimension(3D)headimagesofinfantswithdeformationalplagiocephalyforassessmentofasymmetry.Thefeaturesof3Dpointcloudsofaninfant’scraniumcanbeidentifiedbylocalfeatureanalysisandatwo-phasek-meansclassificationalgorithm.The3Dimagesofinfantswithasymmetriccraniumcanthenbealignedtothesamepose.Themirroredheadmodelobtainedfromthesymmetryplaneiscomparedwiththeoriginalmodelforthemeasurementofasymmetry.Numericaldataofthecranialvolumecanbereviewedbyapediatriciantoadjustthetreatmentplan.Thesystemcanalsobeusedtodemonstratethetreatmentprogress.

简介：Inordertoovercomethepoorlocalsearchabilityofgeneticalgorithm,resultinginthebasicgeneticalgorithmistime-consuming,andlowsearchabilityinthelateevolutionary,weusethegraycodinginsteadofbinarycodingatthebeginningofthecoding;weusemulti-pointcrossovertoreplacetheoriginalsingle-pointcrossoveroperation.Finally,theexperimentshowsthattheimprovedgeneticalgorithmnotonlyhasastrongsearchcapability,butalsothestabilityhasbeeneffectivelyimproved.

简介：ThispaperpresentsanewmodelforedgeextractionofMRimages,basedoncurveevolutionandedgeflowtechniques.Atfirstthemodelforcurveevolutionisconstructed,whichautomaticallydetectboundaries,andchangeoftopologyintermsoftheedgeflowfields,andthenthenumericalapproximationofthemodelisintroduced,whichisbasedonsemi-implicitschemetospeeduptheproposedapproach.Finally,thenumericalimplementationispresentandtheexperimentalresultsshowthattheproposedmodelsuccessfullyextractstheedgecontours,regardlessoftheheavynoise.

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简介：Sincethefirstdiscoveryoftheexcellentperformanceofnickel-bearingironalloysin1889,scientistshavedeveloped3000morekindsofnickelalloys,whichstillhaveanenormousmarketdemandatpresent.However,thescarcityofglobalnickeloreresourceshasrestrictedeconomicdevelopment.Inrecentyears,expertsfromtheInstituteofMultipurposeUtilizationofMineralResourceshavestudiedthecomprehensiveutilizationtechniqueoflow-gradenickeloresfrom

简介：Inthiswork,areliableandsensitivemethodfordetectingpolybrominateddiphenylethers(PBDEs)hasbeendevelopedbythecombinationofliquid–liquidextractionandgaschromatography–massspectrometry.PBDEswereextractedfromalargevolumeofwaterbyliquid–liquidextractionandpurifiedbysilicagelchromatography.Inordertoreducethedeviation,dibromobiphenylwasexploitedastheinternalstandardtominimizedifferencesamongtheinjections.Thequantificationwasperformedusinganexternalstandard.Goodlinearcorrelationcoefficients(>0.991)andawidelinearityrange(1.0–500.0ng/L)indicatedthesteadinessoftheproposedmethod.Moreover,thesatisfactoryrecovery(>75%)suggestedthatsuccessfuldeterminationofPBDEsinriverwaterhadbeenachieved.Furthermore,thedeductionbehaviorofPBDEsinriverwatercouldbeinferredaccordingtotheresults.

简介：Molecularlyimprintedpolymers(MIPs)werepreparedbythebulkpolymerizationusingcrystalvioletasthetemplatemolecule,andthemethacrylicacidandethyleneglycoldimetheacrylateasfunctionalmonomerandcross-linker,respectively.Systematicinvestigationsofsyntheticconditionswereconducted.Thesurfacemorphologyandrecognitionmechanismoftheobtainedpolymerswerestudiedusingscanningelectronmicroscopeandspectrophotometricanalysis.MIPsshowedhighaffinitytotemplatemoleculeandweresuccessfullyappliedasspecialsolid-phaseextractionsorbentforselectiveextractionofcrystalvioletfromnaturalseawater.Anoff-linemolecularlyimprintedsolid-phaseextraction(MISPE)methodfollowedbyhigh-performanceliquidchromatographywithdiodearraydetectionfortheanalysisofcrystalvioletwasalsoestablished.MISPEcolumnshavegoodrecoveriesforcrystalvioletstandardsolutionsandgoodlinearitywasobtainedovertheconcentrationrangeof0-200μgL-1(R2>0.99).Finally,twonaturalseawatersampleswereinvestigated.TherecoveriesofspikedseawaterontheMISPEcolumnswerefrom44.47%to62.34%,therelativestandarddeviation(n=3)beingintherangeof2.89%-5.96%.