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简介：Anewapproachtothetheoryoffinite-amplitudestandingwavesinproposed,andfoumulasofsteadywaveformsarederivedfromthefundamentalequationsofhydrodynamios,asanendeavortosettlethelong-timedisputablesituation.

简介：Amplitudemodulationofnear-wallturbulencebylarge-scalestructuresintheouterlayerisinvestigatedbydirectnumericalsimulationofturbulentchannelflowsatReynoldsnumberReτ=540,1000,2000.Theeffectofmodulationisobviousinthetwo-pointcross-sectioncorrelationmap,andthecorrelationcoefficientsincreasesignificantlywiththeReynoldsnumber.Theinfluenceofmodulationisreflectedinthetailoftheprobabilitydensityfunctionofthenear-wallflowsignals,whichexpandsastheReynoldsnumberincreases.Theflatnessfactorprovidesaquantitativedescriptionofthehighfluctuationeventsduetomodulation.Vorticalstructuresassociatedwithmodulationarerevealedbyconditionallyaveragingtheflowfieldofthenear-wallextremeevents,providingadepictionofhowtheinfluenceofthelarge-scalestructurespenetratetowardsthenear-wallregion.

简介：Thispaperdiscussestheamplitude-squaredsqueezingforthesuperpositionoftwocoherentstateswiththeirphasedifferencesbeingseparatelyπ/2,3π/2,andπ,aswellasforthesuperpositionstateoftwopseudoclassicalstates.Accordingtotheanalysis,itisfoundthatthesuperpositionstateoftwocoherentstateswiththeirphasedifferencesπ/2and3π/2,andthesuperpositionstateoftwopseudoclassicalstatesbothdoexhibittheamplitude-squaredsqueezing.Also,somespecificstatesarefoundtoexhibitevenstrongersqueezingeffectswhenrelativephaseofthesuperpositionisequaltotheaveragephotonnumber.Amplitude-squaredsqueezingisdependentonthedifferenceinphasebetweentwocoherentstates.

简介：Inthispaperanewmethodofultrasonicquantitativediagnosisisdiscribed.Thismethodcanelminatetheeffectofsystemdeviationandlessenthetheeffectofbeamradiationdiffraction.Incanbespp1iedtogetherwithmanykinksofB-scanners.Toverifythemethod,thispaperhasshownanewmethodtomakeatissuephantomandaspecialapparatus.Theresultsshowthatthemethodisusefulinthediagnosisofdiffuseliverdiseases,tumorsandcanccrs.Itisalsousefulintheappraisalofthehealthandthestagesoffetus.

简介：Althoughstimulusfrequencyotoacousticemissions(SFOAEs)havebeenusedasanon-invasivemeasureofcochlearmechanics,clinicalandexperimentalapplicationofSFOAEshasbeenlimitedbydifficultiesinaccuratelyderivingquantitativeinformationfromsoundpressuremeasuredintheearcanal.Inthisstudy,anovelsignalprocessingmethodformulticomponentanalysis(MCA)wasusedtomeasuretheamplitudeanddelayoftheSFOAE.Thisreportshowsthedelay-frequencydistributionoftheSFOAEmeasuredfromthehumanear.AlowlevelacousticalsuppressorneartheprobetonesignificantlysuppressedtheSFOAE,stronglyindicatingthattheSFOAEwasgeneratedatcharacteristicfrequencylocations.Informationderivedfromthismethodmayrevealmoredetailsofcochlearmechanicsinthehumanear.

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简介：Twostochasticmodelsoffatiguecrackgrowthunderconstantamplitudecyclicloadingareproposedandstudiedbyusingthestochasticaveragingmethodandtotalprobabilitytheoremtoac-countforhighfrequencycomponentandlowfrequencycomponent,respectively,oftheirregularna-tureoffatiguecrackgrowthobservedinVirkler’sexperiment.Particularattentionispaidtothepredic-tionperformanceofthemodelsunderachangeintheinitialcracklength.Itisshownthatthemodelsproposedinthepresentpaperyieldsbetteragreementwithexperimentaldatathanothermodelsavail-ableinliterature.

简介：地球媒介的非线性的弹性生产之间的数字差别动态并且岩石的静态的模量。动态模量与超声的速度测量被计算，小周期的模量在装载卸掉实验与小周期被计算，静态的模量在大周期从压力紧张曲线的斜坡被计算，Young's模量在在模量之间的测量point.The关系中从应力的比率被获得到紧张，紧张振幅被在小周期改变紧张振幅学习。从不同测量方法获得的moduli因此被比较。动态模量最大的结果表演，小周期的模量占据第二个位置，静态的模量大周期第三，并且最后幼仔的模量最小。岩石的非线性的模量是紧张水平和紧张振幅的功能。模量与上升紧张振幅指数地减少，当有上升紧张的增加铺平时。最后，下午模型的基本概念简短被介绍，在模量和紧张振幅之间的关系被有不同分发密度和不同open-and-close压力的岩石解释微裂缝。

简介：TheeffectofQiGongreflectedbyrheoencephalographyandheartratewerestudiedinthispaper.ThefunctionalrelationshipbetweenwaveamplitudeandtheheartratesreflectedbytwoprocessesofQiGong,“JingGong”forenergyprovoca-tive,and“FaGong”forenergyreleasehavebeencomparedandanalysed.28casesofwelltrained“QiGong”practitionersvolunteerinthisstudy.Therheoencepha-

简介：Byusignthepotentialmethodtoafluidfilledelastictube,weobtainedasolitarywavesolution.Comparedwithrecluetiveperturbationmethod,thismethodcanbeusedforlargeramplitudesolitarywaves.Theresultisinagreementwiththatofsmallamplitudeapproximationfromreduetiveperturbationmethodwhentheamplitudeissmallenough.

简介：基于尖光谱方法和散布媒介的圆形的Gaussian分发(CGD)模型，我们数字地模仿通过强烈散布媒介的轻集中。在目标区域的一个高对比焦点被与二进制振幅调整使用反馈优化算法生产。形成在任意的区域与一个焦点或多重foci集中是可能的。紧张的改进因素上的空间轻调整的方形的片断的数字的影响被讨论。模拟结果被发现在对为轻refocusing的理论分析的好同意。

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简介：Thispaperproposesaconstitutivelawandamethodforcharacterizinghighlypreloadedviscoelasticmaterialssubjectedtolinear(small-amplitude)vibrations.Amultiplicativenon-separablevariableslawhasbeensuggestedtomodelthebehaviorthatdependsonbothstretchandtime/frequency.Thisapproachallowssplittingtheintricatecombinedtestperformedsimultaneouslyonbothstretchandfrequency,generallyinalimitedexperimentaldomainupto100Hz,intotwoindependenttests.Thus,ononehand,thedynamiccomplexmodulusdependentonfrequencyaloneisevaluatedonthebasisofvibrationtestsinalargeexperimentaldomainupto100kHz.Ontheotherhand,energeticparametersaredeterminedfromaquasi-statichyperelastictensiletest.Thecomplexmodulus,dependentonbothstretchandfrequency,isthendeducedfromtheresultsacquiredfromuncoupledinvestigations.Thisworkshowsthat,inextension,theelasticmodulusincreaseswithincreasingstretch,andthelossfactordecreaseswithincreasingstretch;while,incompression,aroundthematerialundeformedstate,themodulusincreasesasthestretchincreasestillacertainvalueofcompressionstretch(upturnpointdependingonmaterialcharacteristics),andthenthemodulusdecreasesasthestretchincreases.Globally,preloadrigidifiesmaterialsbutreducestheirdampingproperty.Theseresultscloselymatchawell-knownobservationinsolidmechanics.

简介：Newhyperbolicmildslopeequationsforrandomwavesaredevelopedwiththeinclusionofamplitudedispersion.Thefrequencyperturbationaroundthepeakfrequencyofrandomwavesisadoptedtoextendtheequationsforregularwavestorandomwaves.Thenonlineareffectofamplitudedispersionisincorporatedapproximatelyintothemodelbyonlyconsideringthenonlineareffectonthecarrierwavesofrandomwaves,whichisdonebyintroducingarepresentativewaveamplitudeforthecarrierwaves.Thecomputationtimeisgreatlysavedbytheintroductionoftherepresentativewaveamplitude.Theextensionofthepresentmodeltobreakingwavesisalsoconsideredinordertoapplythenewequationstosurfzone.Themodelisvalidatedforrandomwavespropagateoverashoalandinsurfzoneagainstmeasurements.

简介：Wecomprehensivelycharacterizethetransmissionperformanceofm-aryquadratureamplitudemodulation（m-QAM）signalsthroughasiliconmicroringresonatorintheexperiment.Usingorthogonalfrequency-divisionmultiplexingbasedonoffsetQAM（OFDM/OQAM）whichismodulatedwithm-QAMmodulations,wedemonstratelow-penaltydatatransmissionofOFDM/OQAM64-QAM,128-QAM,256-QAM,and512-QAMsignalsinasiliconmicroringresonator.Theobservedopticalsignal-to-noiseratio（OSNR）penaltiesare1.7dBfor64-QAM,1.7dBfor128-QAM,and3.1dBfor256-QAMatabit-errorrate（BER）of2×10-3and3.3dBfor512-QAMataBERof2×10-2.Theperformancedegradationduetothewavelengthdetuningfromthemicroringresonanceisevaluated,showingawavelengthrangeof0.48nmwithBERbelow2×10-3.Moreover,wedemonstratedatatransmissionof191.2-Gbit/ssimultaneouseightwavelengthchannelOFDM/OQAM256-QAMsignalsinasiliconmicroringresonator,achievingOSNRpenaltieslessthan2dBataBERof2×10-2.

简介：Common-reflection-point(CRP)集合是连接地震数据和petrophysical参数的一座桥。预先叠属性抽取并且预先叠倒置，他们俩是水库预言的重要工具。CRP集合的质量通常在地震探索的精确性上有大影响。因此，预先叠CRP集合噪音抑制技术成为一个主要研究方向。基于向量分解原则，这里，我们建议一个方法压制噪音。这个方法由在各种各样的方向寻找估计最佳的单位向量然后通过向量角度变光滑和限制压制噪音。模型测试显示建议方法能把有效信号与噪音分开很好并且在单个wavenumber大小写中有效地压制随机的噪音。我们到真实数据的方法的申请证明方法能恢复有效信号，好振幅保存了从预先叠甚至在到噪音比率(SNR)的低信号的情况中的吵闹的地震数据。

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简介：与偏移量(AVO)支持振幅变化在复杂结构区域的分析，我们与很少侧面的速度变化在媒介基于double-square-root波浪方程介绍一条保存振幅的飞机波浪prestack时间迁居途径。在它的实现，印射算法的一个数据被用来获得数据从一个非递归的阶段移动解决方案与振幅修正跟随在offset-ray-parameter领域和一幅结构的图象产生普通图象的集合的普通中点的集合设置的offset-plane-wave。理论模型测试和一个真实数据例子证明我们的prestack时间迁居途径对在复杂地质的环境的AVO分析有用。

简介：AmplitudequantizationisoneofthemainsourcesofspuriousnoisefrequenciesinDirectDigitalFrequencySynthesizers(DDFSs),whichaffecttheirapplicationtomanywirelesstelecommu-nicationsystems.Inthispaper,twodifferentkindsofspurioussignalsduetoamplitudequantizationinDDFSsareexactlyformulatedinthetimedomainanddetailedlycomparedinthefrequencydo-main,andtheeffectsoftheDDFSparametervariationsonthespuriousperformancearethoroughlystudied.Thenthespectralpropertiesandpowerlevelsoftheamplitude-quantizationspursintheabsenceofphase-accumulatortruncationareemphaticallyanalyzedbywaveformestimationandcomputersimulation,andseveralimportantconclusionsarederivedwhichcanprovidetheoreticalsupportforparameterchoiceandspuriousperformanceevaluationintheapplicationofDDFSs.