简介：与作为分别地散布和镜子的部件使模型和零平均数的随机的窦状隙褪色的改进瑞利一起，一个随机的模拟模型为使波形褪色的瑞利和Rician的产生被建议。与存在相比随机的模型，建议模拟器需要仅仅一试用就算样品的数字不足够大，获得需要的统计性质。而且，建议模拟模型能直接为不同褪色的情形产生多重uncorrelated波形，例如单个输入的单个产量的频率选择隧道和多重输入的多重产量的隧道。建议模拟器有效、精确的表演评估和比较表演。

简介：ComputingtheeigenvalueofsmallestmodulusanditscorrespondingeigneveclorofanirreduciblenonsingularM-matrixAisconsidered,ItisshownthatiftheentriesofAareknownwithhighrelativeaccuracy,itseigenvalueofsmallestmodulusandeachcomponentofthecorrespondingeigenvectorwillbedeterminedtomuchhigheraccuracythanthestandardperturbationtheorysuggests.Analgorithmispresentedtocomputethemwithasmallcomponentwisebackwarderror,whichisconsistentwiththeperturbationresults.

简介：Weexperimentallydemonstrateextractionofsiliconwaveguidegeometrywithsubnanometeraccuracyusingopticalmeasurements.Effectiveandgroupindicesofsilicon-on-insulator(SOI)waveguidesareextractedfromtheopticalmeasurements.AnaccuratemodellinkingthegeometryofanSOIwaveguidetoitseffectiveandgroupindicesisusedtoextractthelinewidthsandthicknesseswithinrespectiveerrorsof0.37and0.26nmonadiefabricatedbyIMECmultiprojectwaferservices.Adetailedanalysisofthesettingoftheboundsfortheeffectiveandgroupindicesispresentedtogettherightextractionwithimprovedaccuracy.

简介：Anefficientandaccuratemethodforsolvingthetwo-dimensionalHelmholtzequationindomainsexteriortoelongatedobstaclesisdevelopedinthispaper.Themethodisbasedonthesocalledtransformedfieldexpansion(TFE)coupledwithaspectral-GalerkinsolverforellipticaldomainusingMathieufunctions.Numericalresultsarepresentedtoshowtheaccuracyandstabilityoftheproposedmethod.

简介：Weperformanalysisforafiniteelementsmethodappliedtothesingularself-adjointproblem.Thismethodusescontinuouspiecewisepolynomialspacesforthetrialandthetestspaces.WefitthetrialpolynomialspacebypiecewiseexponentialsandweapplysoexponentiallyfittedGalerkinmethodtosingularself-adjomtproblembyapproximatingdrivingtermsbyLagrangepiecewisepolynomials,linear,quadraticandcubic.Wtmeasuretheerroeinmaxnorm.Weshowthatmethodisoptimalofthefirstorderintheerrorestimate,WealsogivenumericalresultsfortheGalerkinapproximation.

简介：Forthestabilityrequirementofnumericalresultants,themathematicaltheoryofclassicalmixedmethodsarerelativelycomplex.However,generalizedmixedmethodsareautomaticallystable,andtheirbuildingprocessissimpleandstraightforward.Inthispaper,basedontheseminalideaofthegeneralizedmixedmethods,asimple,stable,andhighlyaccurate8-nodenoncompatiblesymplecticelement(NCSE8)wasdevelopedbythecombinationofthemodifiedHellinger-Reissnermixedvariationalprincipleandtheminimumenergyprinciple.Toensuretheaccuracyofin-planestressresults,asimultaneousequationapproachwasalsosuggested.NumericalexperimentationshowsthattheaccuracyofstressresultsofNCSE8arenearlythesameasthatofdisplacementmethods,andtheyareingoodagreementwiththeexactsolutionswhenthemeshisrelativelyfine.NCSE8hasadvantagesoftheclearingconcept,easycalculationbyafiniteelementcomputerprogram,higheraccuracyandwideapplicabilityforvariouslinearelasticitycompressibleandnearlyincompressiblematerialproblems.ItispossiblethatNCSE8becomesevenmoreadvantageousforthefractureproblemsduetoitsbetteraccuracyofstresses.

简介：WiththedevelopmentofCMOSandMEMStechnologies,theimplementationofalargenumberofwirelessdistributedmicro-sensorsthatcanbeeasilyandrapidlydeployedtoformhighlyredundant,self-configuring,andadhocsensornetworks.Tofacilitateeaseofdeployment,thesesensorsoperateonbatteryforextendedperiodsoftime.Aparticularchallengeinmaintainingextendedbatterylifetimeliesinachievingcommunicationswithlowpower.Forbetterunderstandingofthedesigntradeoffsofwirelesssensornetwork(WSN),amoreaccurateenergymodelforwirelesssensornodeisproposed,andanoptimaldesignmethodofenergyeffcientwirelesssensornodeisdescribedaswell.DifferentfrompowermodelsevershownwhichassumethepowercostofeachcomponentinWSNnodeisconstant,thenewonetakesintoaccounttheenergydissipationofcircuitsinpracticalphysicallayer.Itshowsthattherearesomeparameters,suchasdatarate,carrierfrequency,bandwidth,Tsw,etc,whichhaveasignificanteffectontheWSNnodeenergyconsumptionperusefulbit(EPUB).Foragivenqualityspecification,howenergyconsumptioncanbereducedbyadjustingoneormoreoftheseparametersisshown.

简介：HippocampalvolumelossisanimportantbiomarkerindistinguishingsubjectswithAlzheimer’sdisease(AD)anditsmeasurementinmagneticresonanceimages(MRI)isinfluencedbypartialvolumeeffects(PVE).Thispaperdescribesapost-processingapproachtoquantifyPVEforcorrectionofthehippocampalvolumebyusingaspatialfuzzyC-means(SFCM)method.Thealgorithmisevaluatedonadatasetof20T1-weightedMRIscanssampledattwodifferentresolutions.Thecorrectedvolumesforleftandrighthippocampus(HC)whichare23%and18%forthelowresolutionand6%and5%forthehighresolutiondatasets,respectivelyarelowerthanhippocampalvolumeresultsfrommanualsegmentation.ResultsshowtheimportanceofapplyingthistechniqueinADdetectionwithlowresolutiondatasets.

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简介：Distinguishingwithtraditionaltoothprofileofspiralbevelandhypoidgear,itproposedanewtoothprofilenamelythesphericalinvolute.Firstly,anewtheoryofformingthesphericalinvolutetoothprofilewasproposed.Then,thistheorywasappliedtocompleteparametricderivationofeachpartofitstoothprofile.Forenhancingtheprecision,theSWEEPmethodusedforformationofeachpartoftoothsurfaceandG1stitchingschemaforobtainingaunifiedtoothsurfaceareputforwardandmadetheapplicationintheaccuratemodeling.Lastly,owingtothehigheraccuracyoftoothsurfaceofoutputtedmodel,itgavesomeoptimizationapproaches.Givennumericalexampleaboutthemodelcanshowthatthisdesignedgearwithsphericalinvolutetoothprofilecanachievefastandaccurateparametricmodelingandprovideafoundationfortoothcontactanalysis(TCA)indigitizeddesignandmanufacture.更多还原

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简介：ＡＣＣＵＲＡＴＥ　ＰＩＰＥ　ＴＯＰ－ＥＮＴＲＹ　ＪＵＮＣＴＩＯＮ　ＭＯＤＥＬ　ＦＯＲ　ＳＴＥＡＤＹ　ＡＮＤ　ＵＮＳＴＥＡＤＹ　ＦＬＯＷＳＡＣＣＵＲＡＴＥＰＩＰＥＴＯＰ－ＥＮＴＲＹＪＵＮＣＴＩＯＮＭＯＤＥＬＦＯＲＳＴＥＡＤＹＡＮＤＵＮＳＴＥＡＤＹＦＬＯ...

简介：介绍基于ENN计划构造了一个高精确的差别计划的研究。ENN计划和几高顺序精确性的概述中央计划；数字方法使用了；在加权的功能和计划的精确性之间的关系。

简介：ICSED(ImprovedClusterShadeEdgeDetection)algorithmandothervariousmethodstoaccuratelyandefficientlydetectedgesonsatellitedataarepresented.ErrorratecriterionisusedtostatisticallyevaluatetheperformancesofthesemethodsindetectingoceanicfeaturesforbothnoisefreeandnoisecontaminatedAVHRR(AdvancedVeryHighResolutionRadiometer)IRimagewithKuroshio.Also,practicalexperimentsindetectingtheeddyofKuroshiowiththesemethodsarecarriedoutforcomparison.ResultsshowthattheICSEDalgorithmhasmoreadvantagesthanothermethodsindetectingmesoscalefeaturesofocean.Finally,theeffectivenessofwindowsizeofICSEDmethodtooceanicfeaturesdetectionisquantitativelydiscussed.

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简介：Inthiswork,afastandaccuratestationaryalignmentmethodforstrapdowninertialnavigationsystem(SINS)isproposed.IthasbeendemonstratedthatthestationaryalignmentofSINScanbeimprovedbyemployingthemultipositiontechnique,butthealignmenttimeoftheazimutherrorisrelativelylonger.Overhere,thetwo-positionalignmentprincipleispresented.OnthebasisofthisSINSerrormodel,afastestimationalgorithmoftheazimutherrorfortheinitialalignmentofSINSonstationarybaseisderivedfullyfromthehorizontalvelocityoutputsandtheoutputrates,andthenovelazimutherrorestimationalgorithmisusedforthetwo-positionalignment.Consequently,thespeedandaccuracyoftheSINS'sinitialalignmentisenhancedgreatly.Thecomputersimulationresultsillustratetheefficiencyofthisalignmentmethod.

简介：ThispaperderivestheLindellformulabasedonthegeneralizedvariationalprinciple.ForthecomplexdielectricconstantmeasurementofasmalllossydielectricrodwithRayleigh-Ritzmethod,anaccuratevariationalanalysisisgiven.Theconceptofcomplexfrequencyisintroducedingeneral,andthestabilityofthesolutionisdiscussed.Comparingwiththeresultofperturbationmethod,itisconcludedthatthedeviationofperturbationalgorithmshouldbetakenintoconsideration.

简介：在这份报纸，结果在导致激光的故障光谱学(解放)的第一应用上被介绍为在alpha石蜡的Mg集中的量的决心的技术。这种技术在与传统的方法的那些可比较的Mg集中给精确性，这被表明，作为ICP-OES，在短时间并且没有对样品准备的需要。为500ppb的顺序的Mg的察觉的限制被表明。而且，关于合适的刻度曲线和察觉(LOD)的限制的定义的实现的简短讨论被报导。CLC数字TP274

简介：Anewapproachisproposedtoaccuratelydeterminethethicknessoffilms,especiallyforultra-thinfilms,throughspectrum-fittingwiththeassistanceofaninterferencelayer.Thedeterminationlimitcanreachevenlessthan1nm.Itsaccuracyisfarbetterthanthatofthetraditionalmethods.Thisdeterminationmethodisverifiedbyexperiments,andthedeterminationlimitisatleast3.5nmcomparedwiththeresultsofatomicforcemicroscope(AFM).Furthermore,adoubleinterference-aidedspectrafittingmethodisproposedtoreducetherequirementsofthedeterminationinstruments,whichthusallowsonetodeterminethefilm’sthicknesswithalow-precisioncommonspectrometerandtogreatlylowerthecost.Itisaveryhigh-precisiondeterminationmethodforon-siteandin-situapplications,especiallyforultra-thinfilms.