简介:Theradialbasisfunction(RBF)emergedasavariantofartificialneuralnetwork.Generalizedregressionneuralnetwork(GRNN)isonetypeofRBF,anditsprincipaladvantagesarethatitcanquicklylearnandrapidlyconvergetotheoptimalregressionsurfacewithlargenumberofdatasets.Hyperspectralreffectance(350to2500nm)datawererecordedattwodifferentricesitesintwoexperimentfieldswithtwocultivars,threenitrogentreatmentsandoneplantdensity(45plantsm-2).Stepwisemultivariableregressionmodel(SMR)andRBFwereusedtocomparetheirpredictabilityfortheleafareaindex(LAI)andgreenleafchlorophylldensity(GLCD)ofricebasedonreffectance(R)anditsthreedifferenttransformations,thefirstderivativereffectance(D1),thesecondderivativereffectance(D2)andthelog-transformedre?ectance(LOG).GRNNbasedonD1wasthebestmodelforthepredictionofriceLAIandGLCD.TherelationshipsbetweendifferenttransformationsofreffectanceandriceparameterscouldbefurtherimprovedwhenRBFwasemployed.Owingtoitsstrongcapacityfornonlinearmappingandgoodrobustness,GRNNcouldmaximizethesensitivitytochlorophyllcontentusingD1.ItisconcludedthatRBFmayprovideausefulexploratoryandpredictivetoolfortheestimationofricebiophysicalparameters.
简介:Wepresenttwoschemesforpreparingremotelyathree-particleentangledstatebytwodifferentquantumchannels.Inthefirstscheme,twopartialthree-particleentangledstatesareusedasthequantumchannels,whileinthesecondscheme,threetwo-particlenon-maximallyentangledstatesareemployedasthequantumchannels.Itisshownthattheremotestatepreparationcanbesuccessfullyreal/zealwithcertainprobability,forbothtwoschemes,ifasenderperformssomeprojectivemeasurementsandareceiveradoptssomeappropriateunitarytransformations.Itisshownalsothatthesuccessfulprobabilitiesofthesetwoschemesaredifferent.
简介:Areviewoften-year’spracticeindevelopingtheimprovedsimultaneousphysicalretrievalmethod(ISPRM)isgiveninthehopethatsomecreativeideascanbedrawnfromit.TheimprovementupontheSPRMisassociatedwiththeunder-determinednessofthisill-posedinverseproblem.Inourexperiment,thepreconditionisobservedthatpriorinformationmustbeindependentofthesatellitemeasurements.Thewell-posedretrievaltheoryhastoldusthattheforwardprocessisfundamentalfortheretrieval,anditisthebridgebetweentheinputofsatelliteradianceandtheoutputofretrievals.Inordertoobtainabetterresultfromtheforwardprocess.thefulladvantageofeverypriorinformationavailablemustbetaken.Itisnecessarytoturntheill-posedinverseproblemintothewell-posedone.ThenbyusingtheRidgeregressionorBayesalgorithmtofindtheoptimalcombinationamongthefirstguess,thetheoreticalanalogueinformationandthesatelliteobservations,theimpactoftheunder-determinednessofthisinverseproblemonthenumericalsolutionisminimized.
简介:钇铝柘榴石的一个原型:Ce(Y3Al5O12)象为白带的照明的遥远的黄磷陶器的发光体积通过硅石增加的策略在空中被制作。与在一个特定的范围增加硅石的数量,不透明的样品转弯半透明。晶体的降水被验证在由X光检查衍射(XRD)的纯钇铝柘榴石阶段。在硅石数量的限制以外,钇铝柘榴石水晶的主导的阶段被发现与最新形成的Y2Si2O7,Al2O3和非结晶的阶段的小数量共存。钇铝柘榴石晶体与约2m的一种谷物尺寸并且均匀地散布。在经由在5d4f转变的黄乐队排放的硅石结果的增加的结构的修正以后的钇铝柘榴石主人在由带的蓝色激动的535nm附近达到顶点,由于到甚至当减少的空气不在时的Ce3+的Ce4+的自我减小。
简介:PhysiographyandsoilinMaeRimwatershed,ChiangMaiProvince,Thailandwereinvestigatedbyusingaerialphotographsandsatelliteimageinconjunctionwithfieldwork,andsoilinfiltrationrateandsoilshearresistanceweremeasuredinfield.ManyfactorsaffectingrunoffwereanalyzedusigtheIntegratedLandandWaterInformaitonSystem(ILWIS).Asaresult,amodeldeterminingfloodhazarwassetup.Threempsincludingrunoffcurvenumbermap,runoffcoefficentmap,andfloodinumdationmapwerecreated,Inaddition,thetimeofconcentrationwaspredicted.
简介:ThestudyprovidesoneofthefirstlinesofevidenceshowinglinkagesbetweenAntarcticphytoplanktonabundanceandcompositioninresponsetoENSO,basedonhistoricalreconstructionofsedimentbiomarkers.Inadditiontosedimentbiomarkers,fieldmeasuredandremotesensingdataofphytoplanktonabundancewerealsorecordedfromPrydzBay,EasternAntarctica.CommunitystructureoffieldmeasuredphytoplanktonshowedsignificantElNino/LaNina-relatedsuccessionduring1990to2002.Ingeneral,thenumberofalgaespeciesdecreasedduringElNinoandLaNinayearscomparedtonormalyears.Australsummermonthlyvariationofremotelysensedchlorophyll-a(Chl-a),particulateorganiccarbon(POC),andseasurfacetemperature(SST)indicatedthatENSOimpactedthetimingofphytoplanktonbloomsduring2007to2011.Phytoplanktonblooms(indicatedbyChl-aandPOC)precededtheincreasesinSSTduringElNinoyears,andlaggedbehindtheSSTincreasesduringLaNinayears.Stratigraphicrecordofmarinesedimentarylipid(brassicasterol,dinosterolandalkenones)biomarkersinferredthattheproportionsofdifferentalgae(diatoms,dinoflagellatesandhaptophytes)changedsignificantlybetweenElNinoandLaNinaevents.Therelativeproportionofdiatomsincreased,withthatofdinoflagellatesbeingdecreasedduringElNinoyears,whileitwasreversedduringLaNinayears.
简介:ThisbookistheproceedingsoftheNATOAdvancedScienceInstitute“RemoteSensingofProcessesGoverningEnergyandWaterCyclesintheClimateSystem”,heldinPln,Germany1—12May1995.Inthisbook,atotalof21conferencepapersareincludedwithaspecialpartforpostersummaries.Allthepapersaremodifiedorshortenversions