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简介：Thepartlyspecularreflectionandpartlydiffusionreflectionmodelisaconvenientwaytoexpressthephenomenaofsurfacesoundenergyscatteringinroomacoustics.Soundenergydiffusioncoefficientbecomesakeyfactortostudysurfacescattering.Buttherehavebeenveryfewmethodsfordeterminingtheaveragesoundenergydiffusioncoefficient.Vorliinderproposedsuchaneasyonebasedonthecorrelationprinciple.However,hismethodignoredthecorrelationfromdirectsound,inwhichdefectispresent.Anewapproximatemethodforcalculatingsoundenergydiffusioncoefficient,includingdirectsoundandfirststrongreflectionsispresented.Therefore,Vorlaender''''''''sdefectisovercome.Inaddition,withtheaidofdigitalmeasuringtechnology,arelevantmeasuringsystemwasdeveloped.TheexperimentresultshowsthatthemethodisimprovedthanVorlaender's.

简介：在测量完全的声学的地向量性质任何一个或在周围的噪音精力流动和相对地指导的流动之间的部分取消，例如，放射了能由音调或塑造噪音的点来源是在那里的大小写无关紧要的found.In兴趣的协调或支离破碎的地interact.The现象被称为反对精力fluxes.The纸的赔偿集中于在表面噪音精力流动和反映底部的塑造噪音的int的垂直部件之间的相互作用

简介：在分层的结构被获得的压电的底层和金属电影的声学的波浪的精确答案。阶段速度，机电的联合系数和静态的电容被计算在答案之上基于。陈和Hau是理论被用来分析表面声学的波浪在弄短与单身者一起的栅栏摸每个时期和一脱衣的思考系数表情被介绍。X112潦g上的铝的参数??膰？？

简介：一个激光ultrasonics方法被用来波浪在材料的表面上旅行出现描绘繁殖性质与在2D的表面下的缺点。缺点引起的ultrasonics的线性、非线性的繁殖性质在实验被检测了。一个理论模型被建议并且过去常学习缺点引起的ultrasonics的线性、非线性的性质。当有限振幅ultrasonics与表面下的缺点在材料的表面上宣传时，数字结果显示非线性的超声的波浪将是激动的。理论分析证实非线性的波浪被鼓掌缺点的接口而不是ultrasonics的模式变换引起。

简介：TheapplicationofBEMtocalculateacousticradiationfromclosedsurfaceinaninfiniteacousticme-diumhastheadvantagesoflessmemoryspace,higheraccuracyandfastercalculatingspeed.However,thesingularintegralsandthenonuniquenessproblemofsurfacehelmholtzequationatcharacteristicfrequen-ciesshouldbedealtwith.ItissuggestedinthispaperthatcombinationoftheinteriorHelmholtzequationanditsderivativeswithrespecttothecoordinatecomponentsofaninteriorpointformsanextraequation,inordertosolvetheproblemsofacousticradiationatvariousfrequencieswithsurfaceHelmholtzequation;ontheareawhichincludessingularpoint,thesingularintegralsareconvertedtoordinaryonesbypolarcoordinatetransformation.Asanexample.theacousticradiationfieldofclosedaxisymmetricsurfaceswithprescribedsurfacevelocitydistributioniscalculatedinthispaper.

简介：basedonoptimaldesignonthecoreelementofthesensor,awirelessandpassivesurfaceacousticwave(SAW)temperaturesensorintegratedwithIDTagwaspresented.Areflectivedelayline,whichconsistsofatransducerandeightreflectorsonYZLiNbO3substrate.Wasfabricatedasthesensorelement,inwhich,threereflectorswereusedfortemperaturesensing,andtheotherfivewerefortheIDTagusingphaseencoding.Singlephaseunidirectionaltransducers(SPUDTs)andshortedgratingwereusedtostructurethesAWdevice,leadingtoexcellentsignaltonoiseratio(SNR).TheperformanceoftheSAWdevicewassimulatedbythecouplingofmodes(COM)priortofabrication.Usingthenetworkanalyzer,theresponseintimedomainofthefabricated434MHzSAWsensorwascharacterized,themeasuredS11agreeswellwiththesimulatedone,sharpreflectionpeaks,highsignal/noise,andlowspuriousnoisebetweenthereflectionpeakswereobserved.UsingtheradarsystembasedonFSCWasthereaderunit.thedevelopedSAWtemperaturesensorswereevaluatedwirelessly.Excellent1inearityandgoodresolutionof士1℃wereobserved.

简介：把陈和Hau的理论基于D.P，一个理论方法被介绍分析嘘类型表面的分散特征与一个变化原则和coupling-of-modes在周期的金属性的栅栏结构上宣传的声学的波浪(锯)方程。没有使用复杂格林的功能，方法的精明的结果Hashimoto的理论与那些同意很好。在另一方面，Hashimoto的方法为在ST-90上计算short-circuited栅栏的分散关系是无助的

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简介：Simpleandefficientsurfaceacousticwave(SAW)two-portresonatorswithlowinsertionlossandhighQ-valuesonST-Xquartzsubstrateusingacorrosion-proofA1/Au-stripeelectrodestructurearedevelopedforgassensing.Itwascomposedoftwoshortedgratingreflectorsandadjacentintedigitaltransducers(IDT),andanactivemetalfilminthecavitybetweentheIDTsforthesensitivefilmcoating.Thedevicesareexpectedtoprovidegoodprotectiontowardsmetalelectrodeforgassensorsapplicationinchemicallyreactiveenvironments.Excellentdeviceperformanceaslowinsertionloss,highQfactorandsingle-modeareachievedbycarefullyselectingthemetallicelectrodethickness,cavitylengthandacousticaperture.Priortofabrication,thecouplingofmodes(COM)modelwasperformedfordevicesimulationtodeterminetheoptimaldesignparameters.Thefabricatedsingle-modeSAWresonatoratoperationfrequencyof300MHzrangeexhibitsmatchedinsertionlossof~6.5dBandloadedQfactorinthe3000range.Usingthefabricatedresonatorasthefeedbackelement,adualresonator-oscillatorwithexcellentfrequencystability(0.1ppm)wasdevelopedandevaluatedexperimentally,anditissignificantforperformanceimprovementofSAWgassensor.

简介：从不同光谱形状在水表面上与非线性的最少平方的回归相结合到份量上估计降雨率的一个方法由雨产生了--在一些频率乐队的秋天被介绍。降雨产生的大约2000min光谱数据被收集了在一在厦门开湖城市。作为结果，在15-30kHz的光谱形状被适合到从没有雨，毛毛雨降雨率10mm/h和大雨降雨评估的光谱斜坡允许雨的分类进三个范畴的木头线性的法律10ram/h。然后，降雨察觉被做，降雨率在2-15的频率乐队与逻辑模型一起在毛毛雨时间被确定kHz，和在重降雨的降雨率也与木头线性的回归确定了。最后，所有测量光谱数据被用来与算法计算降雨率。结果证明估计的降雨率与同时地测量的是可比较地重合的。积聚的降雨的平均错误仅仅每min是1%-4%。

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简介：Thefinite-dmerencetime-domam（FDTD）methodisproposedforanalyzingthesurfaceacousticwave（SAW）propagationintwo-dimensional（2D）piezoelectricphononiccrystals（PCs）atradiofrequency（RF）,andalsoexperimentsareestabhshedtodemonstrateitsanalysisresultofthePCs’bandgaps.TheFDTDmethodtakesthepiezoelectriceffectofPCsintoaccount,inwhichperiodicboundaryconditionsareusedtodecreasememory/timeconsumptionandtheperfectlymatchedlayerboundaryconditionsareadoptedastheSAWabsorberstoattenuateartificialreflections.TwoSAWdelaylinesareestabhshedwith/withoutpiezoelectricPCslocatedbetweeninterdigitaltransducers.Byremovingseveralechoeswithwindowgatingfunctionintimedomain,delaylinestransmissionfunctionisachieved.ThePCs’transmissionfunctionsandbandgapsareobtainedbycomparingtheminthesetwodelaylines.WhenAluminum/128°YX-LiNbO3isadoptedasscatterandsubstratematerial,thePCs’bandgapiscalculatedbythisFDTDmethodandCOMSOLrespectively.ResultsshowthatcomputationalresultsofFDTDagreewellwithexperimentalresultsandarebetterthanthatofCOMSOL.