简介:Thisarticleinvestigatesthefractionalderivativeorderidentification,thecoefficientidentification,andthesourceidentificationinthefractionaldiffusionproblems.If1<α<2,weprovetheuniquedeterminationofthefractionalderivativeorderandthediffusioncoefficientp(x)by∫t0u(0,s)ds,0
简介:ThispaperisfocusedonthemodelidentificationofaMicroAirVehicle(MAV)instraightsteadyflightcondition.Theidentificationisbasedoninput-outputdatacollectedfromflighttestsusingbothfrequencyandtimedomaintechniques.Thevehicleisanin-house40cmwingspanairplane.Becauseofthecomplexcoupled,multivariableandnonlineardynamicsoftheaircraft,linearSISOstructuresforboththelateralandlongitudinalmodelsaroundareferencestatewerederived.TheaimoftheidentificationistoprovidemodelsthatcanbeusedinfuturedevelopmentofcontroltechniquesfortheMAV.
简介:Improvingefficiencyinrollgrindingprocessisacriticalissueinthesteelmill.Eachrollhastobegrindedtoawell-definedprofileandthentobemeasuredforqualitycheck.However,thesurfaceconditionsareinspectedbyusingdifferenton-lineinspectionprobesequippedonthegrinder.Therollnumberisauniqueinformationwhichcanbeusedtomergewithahugeamountofmeasurementdatasothattheconditionofeachrollisfullymonitored.Oneofthekeyfactorsthathindertheefficiencyinsuchprocessistheerrorsandtimeconsumptionduetohumanintervention.Inordertomitigatetheseissuesandtorealizethefullyautomaticgrindingprocess,radiofrequencyidentificationtechnology(RFID)couldbeasolutionandhasbeendevelopedinthispaper.ItiswellknownthatwhenanRFIDtagisplaceddirectlyuponametallicobject,intheabsenceofagaporasubstrate,itfunctionsratherpoorlyandevenbecomestotallydysfunctional.Thislimitation,inturn,posesarealbarriertotheuseoftheRFIDonmetallicobjects.ThispaperproposesaminiatureRFIDtagantennadesignforapplicationonrollnumberidentification.TheexperimentaltestsshowthatthemaximumreadrangeoftheproposedRFIDtagplacedonarollisapproximately1.5mandtheoverallsizeisonly32×18×3.2mm~3.AnRFIDsystemforrollnumberidentificationwasusedinarollshopandseveralremarkableimprovementswereachieved,includingthecompletelyautomaticgrindingprocessandtheerror-freeidentification,aswellasthehighpersonnelsafetyoperation.
简介:Anewmethodforirisidentificationbasedonmultiwaveletsisproposed.Bymeansofthepropertiesofmultiwavelets,suchasorthogonality,symmetry,vanishingmomentsandapproximationorder,theiristexturecanbesimplypresented.Abriefoverviewofmuhiwaveletsispresentedatfirst.Irisidentificationsystemandiristexturefeaturepresentationandrecognitionbasedonmultiwaveletsareintroducedsubsequently.Andtheexperimentindicatesthevalidityofthismethodfinally.
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简介:Anewmethodisputforwardforstructuraldamageidentificationbasedonthehomotopycontinuationalgorithm.Anumericalexampleispresentedtoverifythemethod.Thebeamswithdifferentdamagelocationsanddifferentdamageextentsareidentifiedbythismethod.Thenumericalexampleshaveprovedthatthisnewmethodiscapableofeasyconvergence,whichisnotsensitivetotheinitialiterativevalues.Itiseffectiveforaccuratelyidentifyingmultipledamages.Byincorporatingthefiniteelementmethodintothehomotopycontinuationalgorithm,thedamageidentifyingabilityofthenewmethodcanbegreatlyenhanced.
简介:Inthispaper,anovelbiontetricidentificationsystemispresentedtoidentifyaperson'sidentitybyhis/herpalmprint.Incontrasttoexistingpalmprintsystemsforcriminalapplications,theproposedsystemtargetsatthecivilapplications,whichrequireidentifyingapersoninalargedatabasewithhighaccuracyinreal-time.Thesystemisconstitutedbyfourmajorcomponents:UserInterfaceModule,AcquisitionModule,RecognitionModuleandExternalModule.Morethan7,000palmprintimageshavebeencollectedtotesttheperformanceofthesystem.Thesystemcanidentify400palmswithalowfalseacceptancerate,0.02%,andahighgenuineacceptancerate,98.83%.Forverification,thesystemcanoperateatafalseacceptancerate,0.017%andafalserejectionrate,0.86%.Theexecutiontimeforthewholeprocessincludingimagecollection,preprocessing,featureextractionandmatchingislessthan1second.
简介:Ghostimagingcouldbeusedtomakeaquickidentificationoforthogonalobjectsbymeansofphotocurrentcorrelationmeasurements.Inthispaper,weextendthemethodtoidentifynonorthogonalobjects.Inthemethod,anobjectisilluminatedbyonephotonfromanentangledpair,andtheotheroneisdiffractedintoaparticulardirectionbyapre-establishedmultiple-exposurehologramintheidlerarm.Bythecorrelationmeasurements,thenonorthogonalobjectinthesignalarmcouldbediscriminatedwithinaveryshorttime.Theconstraintsfortheidentificationofnonorthogonalobjectsarepresented,whichshowthatthenonorthogonalobjectscanbediscriminatedwhentheoverlappingportionbetweenanytwoobjectsislessthanhalfofalltheobjectsintheset.Thenumericalsimulationsfurtherverifytheresult.
简介:Inthispaper,maximum-likelihood(ML)anditsrelaxationalgorithm,whichareusedtoidentifythemathematicsmodelofanunderwatervehicle(UV),arcdiscussed.Withthetrialdataofzigzagtests,thehydrodynamicderivativesoftheUVwereestimated,andtherelaxationalgorithmisconfirmedtohavebetterastringencyfromthecontrastbetweenthetwomethods.Thenasimulationenvironmentbasedontheseparametersisestablishedtoverifythevalidityandeffectofthesemeth-ods.Theresultshowsthemodeliscredibleandthemethodsareveryusefulfortheresearchofmaneuverabilityandadaptivecontrolofunderwatervehicles.
简介:ThegeneticcodonUGAhasadualfunction:servingasaterminatorandencodingselenocysteine.However,mostpopulargeneannotationprogramsonlytakeitasastopsignal,resultinginmisannotationorcompletelymissingselenoproteingenes.WedevelopedacomputationalmethodnamedAsec-Predictionthatisspecificforthepredictionofarchaealselenoproteingenes.Toevaluateitseffectiveness,wefirstapplieditto14archaealgenomeswithpreviouslyknownselenoproteingenes,andAsec-Predictionidentifiedallreportedselenoproteingeneswithoutredundantresults.Whenweapplieditto12archaealgenomesthathadnotbeenresearchedforselenoproteingenes,Asec-PredictiondetectedanovelselenoproteingeneinMethanosarcinaacetivorans.Furtherevidencewasalsocollectedtosupportthatthepredictedgeneshouldbearealselenoproteingene.TheresultshowsthatAsec-Predictioniseffectiveforthepredictionofarchaealselenoproteingenes.
简介:Agravitropism-deficientmutantM96wasisolatedfromamutantbank,generatedbyethylmethanesulfonate(EMS)mutagenesisofindicariceaccessionZJ100.Themutantwascharacterizedasprostrategrowthatthebeginningofgermination,andtheprostrategrowthphenotyperanthroughthewholelifeduration.TillerangleandtillernumberofM96increasedsignificantlyincomparisonwiththewildtype.TissuesectionobservationanalysisindicatedthatasymmetricstemgrowtharoundthesecondnodeoccurredinM96.GeneticanalysisandgenemappingshowedthatM96wascontrolledbyasinglerecessivenucleargene,tentativelytermedasgravitropism-deficientM96(gdM96),whichwasmappedtoaregionof506kbflankedbymarkersRM5960andInDel8onthelongarmofchromosome11.SequencinganalysisoftheopenreadingframesinthisregionrevealedanucleotidesubstitutionfromGtoTinthethirdexonofLOC_Os11g29840.Additionally,real-timefluorescencequantitativePCRanalysisshowedthattheexpressionlevelofLOC_Os11g29840inthestemswasmuchhigherthanintherootsandleavesinM96.Furthermore,theexpressionlevelwasmorethanfourtimesinM96stemthaninthewildtypestem.OurresultssuggestedthatthemutantgenewaslikelyanewalleletothereportedgeneLAZY1.IsolationofthisnewallelewouldfacilitatethefurthercharacterizationofLAZY1.
简介:Spectralfeatureofforestvegetationwithremotesensingtechniquesistheresearchtopicallovertheworld,becauseforestplaysanimportantroleinhumanbeings'livingenvironment.Researchonvegetationclassificationwithvegetationindexisstillverylittlerecently.Thispaperproposesamethodofidentifyingforesttypesbasedonvegetationindices,becausethecontrastofabsorbingredwavebandwithreflectingnear-infraredwavebandstronglyfordifferentvegetationtypesisrecognizedasthetheoreticbasisofvegetationanalysiswithremotesensing.Vegetationindexishighlyrelatedtoleafareaindex,absorbedphotosyntheticallyactiveradiationandvegetationcover.Vegetationindexreflectsphotosynthesisintensityofplantsandmanifestsdifferentforesttypes.AccordingtoreflectancedataofforestcanopyandsoillineequationNIR=1.506R+0.0076inJingyuetan,ChangchunofChina,manyvegetationindicesarecalculatedandanalyzed.Theresultshowsthattherelationshipsbetweenveg
简介:Adiatomwaspurifiedwithcolonyselectionandcontinuousdilutionmethods.ItwasidentifiedtoCylindrothecaclosteriumaccordingtoitsmorphologicalcharacteristicsandrbcLand18srRNAgenesequences.Thealgawasnotsensitivetoampicillinandneomycin,butsensitivetochloramphenicolwhichinhibiteditsgrowthatconcentrationsrangingfrom50to150μgmL-1.Thepurifiedalgawaseasytocultureanditsspecificgrowthratewas0.207±0.002(d-1).Itwasresistanttopollutionandcouldbeharvestedinaneasyway.Itwasrelativelyhighinlipidcontent(20.08%±0.67%ofdryweight)andthecombinedamountofits16:0and16:1(n-7),themostsuitableresourceofbiodiesel,wasashighas64%ofthetotalfattyacids,whiletheamountofpolyunsaturatedfattyacidsreached19.96%–20%ofthetotalfattyacids.ThusthepurifiedC.closteriumcanbeculturedasabiodieselproduceroranutritionsupplementproducer.
简介:Reconnaissancereportsandpertinentresearchonseismichazardsshowthatliquefactionisoneofthekeysourcesofdamagetogeotechnicalandstructuralengineeringsystems.Therefore,identifyingsiteliquefactionconditionsplaysanimportantroleinseismichazardmitigation.Oneofthewidelyusedapproachesfordetectingliquefactionisbasedonthetime-frequencyanalysisofgroundmotionrecordings,inwhichshort-timeFouriertransformistypicallyused.Itisknownthatrecordingsatasitewithliquefactionaretheresultofnonlinearresponsesofseismicwavespropagatingintheliquefiedlayersunderneaththesite.Moreover,Fouriertransformisnoteffectiveincharacterizingsuchdynamicfeaturesastime-dependentfrequencyoftherecordingsrootedinnonlinearresponses.Therefore,theaforementionedapproachmaynotbeintrinsicallyeffectiveindetectingliquefaction.AnalternativetotheFourier-basedapproachispresentedinthisstudy,whichproposestime-frequencyanalysisofearthquakegroundmotionrecordingswiththeaidoftheHilbert-Huangtransform(HHT),andoffersjustificationfortheHHTinaddressingtheliquefactionfeaturesshownintherecordings.Thepaperthendefinesthepredominantinstantaneousfrequency(PIF)andintroducesthePIF-relatedmotionfeaturestoidentifyliquefactionconditionsatagivensite.Analysisof29recordeddatasetsatdifferentsiteconditionsshowsthattheproposedapproachiseffectiveindetectingsiteliquefactionincomparisonwithothermethods.