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简介：Asimplifiedclosed-formanalyticsolutionforUWBimpulsesignaltransmittingthroughafinitelyconductingslabisproposed.Theapproachfirstrequiresevaluatingtheimpulseresponseoftheslabandthenconvolvingitwiththespecifiedincidentfieldwaveform.Toobtaintheimpulsivetransmittingfield,eitherforverticalorhorizontalpolarization,approximationstotherefractioncoefficientsandpropagationlossaremade,whichcanbeprovedtobeaccurateenough,comparingwiththeirfrequencydomainsolutions.Thereby,itpermitssimplifiedclosed-formexpressionsinthetimedomainforbothterms.Theresultingtransientresponseforthetransmittingimpulsefieldisthengivenbyconvolutionofthetimedomainrefractioncoefficientsandtimedomainpropagationloss.Anumericalexampleofanincidentmonocycletransmittingthroughaslabusingthistechnique,ispresented,toillustratetheeffectiveuseofthemethod.

简介：ItisshownthataGaussianlightbeamtransmittingthroughaplanarthindielectricslabintheairundergoesfourdifferenteffects,i.e.lateralGoos–Hnchen-like(GHL)displacement,angulardeflection,widthmodificationandlongitudinalfocalshiftascomparedwiththeresultspredictedbygeometricaloptics.AccordingtotheTaylorexpansionoftheexponentoftransmissioncoefficientwhenexpressedasanexponentialform,thelateralGHLdisplacementandtheangulardeflectionarethefirst-ordereffectsandcanbenegativeorpositive.Thewidthmodificationandthelongitudinalfocalshiftarethesecond-ordereffectsandcanalsobepositiveornegative.Owingtothewaist-widthdependentterm,thenon-geometricaleffectsoftransmittedbeamarenotidenticalwiththenon-speculareffectsofreflectedbeam.Theconditionsforthevalidityofthoseeffectsaresuggestedandnumericalsimulationsarealsogiven.

简介：ThispapersummarizesthebasicsituationoftheBinchuanTransmittingSeismicStationandthegeophysicalobservationsoftheareawhereitislocated,withafocusontheconstitutionoftheobservationsystemofthetransmittingseismicstation,theexcitationcharacteristicsandpropagationdistanceofsignalsexcitedbytheairgunsourceinthereservoirandwell.ThepaperalsosummarizesanddiscussesontheresultsoftheobservationsandproblemsencounteredsincetheTransmittingSeismicStationwasbuilt.Finally,thispaperproposesthemainresearchtobecarriedoutonthebasisoftheprojectaims.

简介：当时，本地联合不稳定性将发生吸收边界状况和地波浪方程的数字计划允许精力自发地进入计算领域。也就是说，二个计划支持普通波浪解决方案，组速度指了进计算域。消除联合不稳定性的本地人的钥匙是避免如此的波浪答案。为块团在2D波导的P-SV波浪运动的有限元素模拟，为高顺序的稳定的实现的一条途径多播送的公式被提供。与一个一致矩形的网孔，它被证明并且验证那高周波的本地联合不稳定性能被设置等于或比\大的元素尺寸的比率消除(\sqrt2\)乘到S波浪速度的P波浪速度的比率。这些结果能为发另外的吸收边界条件导致的不稳定性问题是珍贵的。