简介：Thispaperreviewsthestudiesonacoustoelectriceffectinextrinsicsemiconductormaterialsusedinvariousscientificandothermeasurements.Ahistoricalreviewofearlierfindingsisgivenwithspecialreferencetoassociatedmechanisms.Acoustoelectricstudiesinsolidstatedevioesrequirefurtherattentionandtheworkdoneinthisareaisalsodiscussed.

简介：masker与maskee的理论分析和实验是空间的在方位角的分离证明当masker和maskee空间地被分开时，阀值趋于到落下和空间揭露的producethe现象。结果也证明空间揭露与频率有关。频率越高，空间揭露是越多stronger。最大的揭露是15dB。主要暗示是masker和maskee什么时候采购原料，空间地在方位角被分开，因为头的影响，单耳的Signal-to-Mask比率(SMR)将增加相关转移功能(HRTF)。同时，由更高听觉的系统的听觉的信息的有两耳的处理是空间揭露的另一个原因。

简介：BasedontheFenlon‘stheorytheparametriceffectsinfluidsduetothenonlinearinteractionofalowfrequencypumpingwaveandahighfrequencyprobingwaveareanalysed.TheexpressionsofpressureamplitudeofsumordifferencefrequencysidebandandthefromulaofnonlinearityparameterB/Aforlossymediumarederived.Theoreticalcalculationdemonstrated,thatthesidebandcomponentsincreaselinearlywithpumpsignal.Therefore,amethodfordeterminationofB/Aisprovidedandtheval-uesforseveralbiologicalfluidsandmixturesaremeasured.

简介：Themutualradiationimpedanceignoredinconventionalarraydirectivityformulaisintroducedintothecalculationofarrayradiationsoundfield,andamodifiedarraydirectivityformulaconsideringthemutualradiationimpedanceisgainedaccordingtothesuperpositionprinciple.Resultsofcomputersimulationandexperimentsforauniformlineararrayandauniformplanararrayshowsuperiorperformanceonthepresentofthepracticaldirectivitypatternofthemodifiedformulainthispaperincomparisontotheconventionalone.

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简介：Thecreepeffectofsuspensionsinelectro-dynamicloudspeakerswasmodeledbasedonfractionalorderderivatives.Thefractionalstandardlinearsolid(FSLS)modelwaspresentedbysubstitutingtheAbeldashpotforNewtondashpotinStandardLinearSolid(SLS)model.TheelectricalimpedanceaswellasthetransferfunctionbetweendiaphragmdisplacementandinputvoltageofthetwotestedmidrangeloudspeakerswasmeasuredbyKlippellaseranalyzersystem,andthemodelparameterswereidentifiedbytheleast-mean-squaremethod.BycomparingthefittingresultsofFSLSmodelwiththeothertwoclassicalmodels-4ParameterLogarithmicmodelandSLSmodel,theresultsshowthattheFSLSmodelcanrightlypredictthefrequencydependentcompliancelossfactorandyieldhigheraccuracyformodelingthecreepeffectinloudspeakersuspensions.

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简介：Theresearchisabouttheeffectofalayerofvaryingdensityofsea-bottomsedimentsonspatialcorrelationofsea-bottombackscattering.Therelationshipbetweenscatteringcrosssectionandspatialcorrelationisthatbackscatteringcrosssectiondecreasesquicklyandthespatialcorrelationbecomesstrongerastheincidentangleincreases.Therefore,thedensitydepthprofileisintroducedintosea-bottomhigh-frequencybackscatteringechomodel,whichisusedtosimulatesea-bottombackscatteringandcalculatethefunctionofspatialcorrelation.Theinfluenceofthedensitygradientonspatialcorrelationofsea-bottombackscatteringisinvestigatedbyanalyzingtherelationsbetweenverticalgradientofdensityandthescatteringcrosssection.Ascanbeseenfromthesimulationresults,theimpactofthedensitygradientonthespatialcorrelationisfoundmoresignificant.Whilethedensitygradientincreases,thescatteringcross-sectionandtheradiusofthespatialcorrelationbroaden,thespatialcorrelationbecomesstronger.Atthesametime,thescatteringcross-sectiondecreasesmorequicklyastheincidentangleincreases.

简介：在坚硬地在任意的角度连接的二个无限的盘子的角落接口的颤动精力传播被波浪途径学习以便调查堵住使用减少把波浪传播弄弯的飞机的质量的效果。二个本地坐标系统被介绍，暗示管理盘子的典型阻抗或堵住质量的相应比率的六个新非维的系数被介绍简化传播和思考系数的明确的表达。五件样品在experiment.Discussions被测试以插入损失基于在预言和实验之间的比较被执行。在角落接口堵住质量象“一个lowpass过滤器”一样行动，这被结束，为在某些频率上面的颤动变细有效。在“变细乐队”的TL和IL的价值每每统一一些堵住的团在惯性的集体时刻统一“变细乐队”的长度和乐队宽度主要取决于质量。

简介：Whenthesignalsreceivedbyanytwoarrayelementsarenotfullycorrelated,theperformanceofDOA(DirectionOfArrival)estimationmethodsmightdegradeiftheplane-wavemodelassumptionisstillused.Fornarrowbanduniformlineararray,byutilizingthepropertyofToeplitzmatrix,itisprovedthatthereceivedsignalscanbeexpressedasthesumofseveralplane-wavesignals,whichcanbeviewedasthe'splitting'partsofthetruesources.The'splitting'ofsourcesmakesitdifficulttoestimatethetruenumberofsources.Asaresult,spuriouspeaksmightoccurinthespatialspectrumwhensubspace-basedhigh-resolutionspatialspectrumestimationtechniqueisused.