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73 个结果
  • 简介:EnglishditransitiveconstructionisasignificantcomponentofGoldberg’sconstructiongrammarwhichisbasedoncognitivelinguistics.ItaimstoenlightenteachersandlearnersofSLA.ItpresentsbackgroundsandthebasicconceptsofGoldberg’sconstructiongrammar,depictswhatEnglishditransitiveconstructionisanditssemanticconstraints,andreferstoenlightmentsofEnglishditransitiveconstructiononSLAfromfourperspectives.

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  • 简介:Inthispapertheexistenceandstabilityofthepositiveequilibriumofthesize-structuredpopulationmodelareprovedbyRabinowitz'stheoremandthelocallinearizationmethod.Theresulthereshowsthatnearthebifurcationpointwhereabranchofpositiveequilibriaappears,thestabilityofthepositiveequilibriumonthebranchisdcpendentonthedirectionofthebifurcation.Theargumentforthemodelofage-structuredpopulationisgeneralizedinthispaper.

  • 标签: 整体模型 系统建模 平衡方程 线性化方法 分岔 稳定性
  • 简介:分布式的网络建筑学和节点的动态变化使结构化的对等的网络的操作无法预言。这篇文章试图通过一个数学模型在结构化的对等的网络的跑的规则上介绍研究。建议模型提供一个低复杂性的工具从二个方面估计结构化的peer-to-peernetwork的表演:一个节点的平均存在时间和回到网络的一个暂时稳定的状态的概率。根据结果,建议结构化的对等的网络对节点变化的频率在有限价值下面的那些条件合适,这能被结束,并且这值主要取决于节点的初始化的时间。不同、结构化的对等的网络能作为排队的一个网络被提炼系统,它由排队的许多节点组成以一个网状的方法的系统和网络系统被分析。

  • 标签: P2P网络 分布式杂乱信号 MARKOV模型 存在性
  • 简介:Thefeaturesofthecharacteristicmatrixusedinlinearintensitycorrelationreconstructionmethodsaredirectlyrelatedtothequalityofghostimaging.Inordertosuppressthenoisecausedbytheoff-diagonalelementsinthecharacteristicmatrix,weproposeareconstructionmethodforghostimagingcalledscalar-matrix-structuredghostimaging(SMGI).Thecharacteristicmatrixismadetoapproximateascalarmatrixbymodifyingthemeasurementmatrix.ExperimentalresultsshowthatSMGIimprovesthepeaksignal-to-noiseratiooftheobjectreconstructionsignificantlycomparedwithdifferentialghostimaging,eveninthecaseofanonzerotwo-armlongitudinaldifference,whichisapromisingresultforpracticalapplications.

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  • 简介:Asemi-structureddocumenthasmorestructuredinformationcomparedtoanordinarydocument,andtherelationamongsemi-structureddocumentscanbefullyutilized.Inordertotakeadvantageofthestructureandlinkinformationinasemi-structureddocumentforbettermining,astructuredlinkvectormodel(SLVM)ispresentedinthispaper,whereavectorrepresentsadocument,andvectors'elementsaredeterminedbyterms,documentstructureandneighboringdocuments.TextminingbasedonSLVMisdescribedintheprocedureofK-meansforbriefnessandclarity:calculatingdocumentsimilarityandcalculatingclustercenter.TheclusteringbasedonSLVMperformssignificantlybetterthanthatbasedonaconventionalvectorspacemodelintheexperiments,anditsFvalueincreasesfrom0.65-0.73to0.82-0.86.

  • 标签: HTML语言 XML语言 半结构文件模型 版本开采 结构信息
  • 简介:Thedetectordescriptiondatabase,theeventdatastructure,theconditiondatabaseareallexamples(amongothers)ofcomplexcollectionsofobjectswhichneedtobeunambiguouslyidentified,notonlyinternallytotheirownmanagementstructure.butalsofromonecollectiontotheother.Therequirementsforsuchanidentificationschemeincludethemanagementofidentifiersindividuallyattachedtoeachcollectedobject,thepossibilitytoformallyspectifytheseidentifiers(egthroughdictionaries),togenerateoptimisedandcompactrepresentationsfortheseidentifiersandtobeabletousethemassortingandsearchingkeys.wepresentherethegenerictoolkitdevelopedinthecontextoftheAtlasexperimenttoprimarilyprovidetheidentificationofthereadoutelementsofthedetector.Thistoolkitoffersseveraleithergenericorspecializedcomponentsuchas:anXMLbaseddictionarywithwhichtheformalspecificationofaparticularobjectcollectionisexpressed,asetofvariousbinaryrepresentationsforidentifierobjects(offeringvariouslevelofcompaction),rangeoperatorsmeanttomanipulaterangesofidentifiers,andfinallyacollectionmanagersimilartotheSTLmapbutoptimisedforanorganizationkeyedbyIdentifiers.Allthesecomponentseasilyinteroperate.InParticulartheIdentifierdidctionaryoffersmeansofspecifyingpermittedcardinalitiesofobjectsateachlevelofthehierarchy,ThiscanthenbetranslatedintoIdentifierRangesorcanbeusedasthestrategydriverforhighcompactificationoftheidentifiers(e.g.tostoreverylargenumberofidentifiedobjects).Currentuseofthistoolkitwithinthedetectordescriptionwillbepresented,andexpectedorpossibleotherusageswillbediscussed.

  • 标签: Atlas实验层次数据库 层次结构 属性识别
  • 简介:Awoofer–tweeteradaptiveopticalstructuredilluminationmicroscope(AOSIM)ispresented.Bycombiningalow-spatial-frequencylarge-strokedeformablemirror(woofer)withahigh-spatial-frequencylow-strokedeformablemirror(tweeter),weareabletoremovebothlarge-amplitudeandhigh-orderaberrations.Inaddition,usingthestructuredilluminationmethod,ascomparedtowidefieldmicroscopy,theAOSIMcanaccomplishhighresolutionimagingandpossessesbettersectioningcapability.TheAOSIMwastestedbycorrectingalargeaberrationfromatriallensintheconjugateplaneofthemicroscopeobjectiveaperture.TheexperimentalresultsshowthattheAOSIMhasapointspreadfunctionwithanFWHMthatis140nmwide(usingawaterimmersionobjectivelenswithNA=1.1)aftercorrectingalargeaberration(5.9μmpeak-to-valleywavefronterrorwith2.05μmRMSaberration).Afterstructuredlightilluminationisapplied,theresultsshowthatweareabletoresolvetwobeadsthatareseparatedby145nm,1.62×belowthediffractionlimitof235nm.Furthermore,wedemonstratetheapplicationoftheAOSIMinthefieldofbioimaging.Thesampleunderinvestigationwasagreen-fluorescentprotein-labeledDrosophilaembryo.Theaberrationsfromtherefractiveindexmismatchbetweenthemicroscopeobjective,theimmersionfluid,thecoverslip,andthesampleitselfarewellcorrected.UsingAOSIMwewereabletoincreasetheSNRforourDrosophilaembryosampleby5×.

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  • 简介:Wepresentadigitalholographicmicroscopewhereinthesampleisilluminatedbystructuredlighttoenablethecaptureofadditionalobjectspatialfrequencies.ReconstructedimageswithincreasedspatialresolutionareobtainedbyseparatingandsynthesizingbandwidthsofdifferentfrequencyregionsintheFourierdomain.Thetheoreticalanalysisandexperimentalresultsarepresented.

  • 标签: 结构照明 数字全息 显微镜 分辨率增强 空间频率 空间分辨率
  • 简介:学习评价一直是各国教育改革与实践的"新宠"。加拿大亚伯达省(Alberta)的学生学习评价(SLA)是以加拿大的社会走向为背景,政治、经济、教育与师生的相互作用为动力因素而产生的学习性评价,是对传统教育评价的传承与发展,又自然融入了"启发性教育"和学生未来发展评价的深度检视。在实践过程中发挥学生学习评价的工具性价值,在目的和功能走向上侧重发展性价值。反观我国学习评价的现状及特点,建构由静态教育评价转为生本特征的学生学习评价,数值化指标转为增值能力的指标系列和散乱的评价块转为创生指导的评价方案,力求填补我国学习评价领域的空缺。

  • 标签: 加拿大 学生学习评价(SLA) 启发式教育 未来发展评价
  • 简介:ThispaperdealswiththeclassofQ-tensors,thatis,aQ-tensorisarealtensorAsuchthatthetensorcomplementarityproblem(q,A):findinganx∈R~nsuchthatx≥0,q+Ax~(m-1)≥0,andx~T(q+Ax~(m-1))=0,hasasolutionforeachvectorq∈R~n.SeveralsubclassesofQ-tensorsaregiven:P-tensors,R-tensors,strictlysemi-positivetensorsandsemi-positiveR_0-tensors.WeprovethatanonnegativetensorisaQ-tensorifandonlyifallofitsprincipaldiagonalentriesarepositive,andsotheequivalenceofQ-tensor,R-tensors,strictlysemi-positivetensorswasshowediftheyarenonnegativetensors.WealsoshowthatatensorisanR_0-tensorifandonlyifthetensorcomplementarityproblem(0,A)hasnonon-zerovectorsolution,andatensorisaR-tensorifandonlyifitisanR_0-tensorandthetensorcomplementarityproblem(e,A)hasnonon-zerovectorsolution,wheree=(1,1···,1)~T.

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  • 简介:Naturalsurfaceswithsuperhydrophobicpropertiesoftenhavemicroorhierarchicalstructures.Inthispaper,thewettingbehavioursofasingledropletonbiomimeticmicrostructuredsurfaceswithdifferentroughnessparametersareinvestigated.Atheoreticalmodelisproposedtostudywettingtransitions.Theresultsoftheoreticalanalysisarecomparedwiththoseofexperimentindicatingthattheproposedmodelcaneffectivelypredictthewettingtransition.Furthermore,anumericalsimulationbasedonthemesoscaleLatticeBoltzmannMethod(LBM)isperformedtostudydynamiccontactangles,contactlines,andlocalvelocityfieldsforthecasethatadropletdisplaysonthemicrostructuredsurface.Asphericalwaterdropletwithrs=15μmfallsdowntoabiomimeticsquare-postpatternedsurfaceundertheforceofgravitywithaninitialvelocityof0.01m·s-1andaninitialverticaldistanceof20μmfromdropletcentretothetopofpots.Inspiteofahigherinitialvelocity,thedropletcanstillstayinaCassiestate;moreover,itreachesanequilibriumstateatt≈17.5ms,whencontactangleis153.16°whichisslightlylowerthanthepredictionofCassie-Baxter’sequationwhichgivesθCB=154.40°.

  • 标签: BIOMIMETIC WETTING BEHAVIOURS ROUGHNESS surfaces contact
  • 简介:Thispaperpresentsanewmethodtocontrolthepositionofamicro-columnsnowtarget.Thistargetenablesthemeasurementofthemeanelectrondensityofthepre-plasmacreatedbyapre-pulsewithdifferenttimedelays.Thisresearchwillallowabetterunderstandingofthegenerationoffastprotonsfromtheinteractionbetweenastructuredpre-plasmaandahighintensitylaser.

  • 标签: high INTENSITY LASERS plasma PROTON ACCELERATION
  • 简介:在一个D输入Hammerstein系统的multivariate非线性的nonparametric鉴定的问题被检验。如果输入大小被组织,在意义,那在那里存在,这被表明在他们之间的某隐藏的关系,即如果他们在一些上是分布式的(未知)在R的d维的空格MD,dD,然后,系统非线性能与集中率O在M上在点被恢复(nd上的1/(2+d))依赖者。这率因此比通用的率O快(n<啜class=“a-plus-plus”>1/(2+D))由典型nonparametric算法完成了并且完全由输入D的数字控制了。

  • 标签: HAMMERSTEIN 非参数辨识 结构化数据 MISO 系统 多元非线性
  • 简介:High-strengthsteelshavebeenattractingmoreandmoreattentionofpeople,Unfortunately.deteriorationofductilitylimitedtheirapplications.Tosolvethisproblem,anano-structuredstainlesssteelsheetisdevelopedtocombinehighstrengthandhighductility.Processingofthesurfacemechanicalattritiontreatment(SMAT)wasintroducedtoobtainanano-grainlayeronthedoublesurfaceofthestainlesssteelsheet.Themicrostructureofthenanostructuredsteelsheetischaracterizedbyanalternatedistributionofcoarsegrainedlayerandnanocrystallinelayer.Thenthedualsurfacenano-crystallizedstainlesssteelsheetswereco-warmrolledat500℃.Theexperimentalresultsrevealthatthemechanicalpropertiesofthenanostructuredsteelexhibithighyieldstrengthintherangeof700-950MPaandtensilestrengthhigherthan930MPa.Moreover,elongationtofracturereachesto15%-48%,togetherwithauniformelongationstabilizedto13%-45%.

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  • 简介:Atechniqueispresentedforcreatingsurface-adheringdustlayersunderdefinedconditions,andcharacterizingandstressingthelayerscreated.Theproceduredescribedisshowntobesuitableforthequantitativeevaluationoftheeffectsofdifferentparameterssuchasparticlesize,porosityandsurfaceroughnessetc.onthestabilityofparticlelayers.

  • 标签: 粒子层流 结构强度 层流分离 应力特征
  • 简介:传统的SLA蓄电池充电控制方法有定时控制、Vmax控制、△V控制、温度控制等。这些充电控制方法均未能有效遵从电池内部的物理化学规律,使整个充电过程存在着严重的过充电和析气等现象,充电效率低。本文针对SLA蓄电池的四阶段充电特点,结合模糊控制和嵌入式技术,提出一种基于ARMCortex—M3LM3S的智能模糊SLA蓄电池充电方案。该充电方案对充分发挥SLA蓄电池的功效,提高对SLA蓄电池的充电速度,减少充电损耗,延长SLA蓄电池的使用寿命具有重要意义。

  • 标签: SLA蓄电池 模糊控制 μC/OS—II ARM Cortex—M3 LM3S301
  • 简介:AnewmethodologyofvoiceconversionincepstrumeigenspacebasedonstructuredGaussianmixturemodelisproposedfornon-parallelcorporawithoutjointtraining.Foreachspeaker,thecepstrumfeaturesofspeechareextracted,andmappedtotheeigenspacewhichisformedbyeigenvectorsofitsscattermatrix,therebytheStructuredGaussianMixtureModelintheEigenSpace(SGMM-ES)istrained.Thesourceandtargetspeaker’sSGMM-ESarematchedbasedonAcousticUniversalStructure(AUS)principletoachievespectrumtransformfunction.Experimentalresultsshowthespeakeridentificationrateofconversionspeechachieves95.25%,andthevalueofaveragecepstrumdistortionis1.25whichis0.8%and7.3%higherthantheperformanceofSGMMmethodrespectively.ABXandMOSevaluationsindicatetheconversionperformanceisquiteclosetothetraditionalmethodundertheparallelcorporacondition.TheresultsshowtheeigenspacebasedstructuredGaussianmixturemodelforvoiceconversionunderthenon-parallelcorporaiseffective.

  • 标签: 高斯混合模型 语音转换 特征空间 结构化 倒谱 语料库