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简介：Atpresent,thereislesstheoreticalresearchandpracticalexperienceintheaspectofultrashallowseismicexplorationtothetargetlayersatdepthsofonlytensofmetersbothathomeandabroad.Seismicexplorationplaysanimportantroleinthelocationoffaultsandactivestructures,butthedepthdozensofmetersbelowthegroundsurfaceistheblindareaofanykindofdeepandshallowseismicexploration.Startingfromthepointofviewofdetectingurbanactivefaults,andusingrelatedtheoriesandmethodsofgeology,geophysicsandmathematics,thepaperdiscussesthepreconditionsforacquiringefficientultra-shallowseismicsurveyresultsincomplicatedgeologicalbackgroundsinQingdao.TakingtheQingdaoareaasanexampleinthispaper,westudythedepthconditionofQuaternarydeposits,andapply4-8stackingfoldstosatisfytherequirementtogettheexplorationresultswithhigh-resolutionandhigh-SNR.Preliminaryresultsrevealthatselectingapropersurveillancelayoutisoneofthekeystoacquireauthenticexplorationresultsinultra-shallowP-wavereflectionexploration.OurresultsalsoshowthatultrashallowseismicreflectionmethodindetectingfaultsintheQingdaoareahasgoodapplicationprospects.

简介：Thispaperproposesanultra-modifiedSSA(symmetricsequencealgorithm)ofspacevectormodulationofMC(matrixconverter).Theultra-modifiedtechniqueimprovesthedrawbacksofthemodifiedonewhereitprovidesareductionofthetotalharmonicdistortionforbothoutputvoltageandcurrent.AlsothispaperproposesamodifiedfeedforwardcontrolleroftheMCwithindirectspacevectormodulation.Themodifiedfeedforwardprovidesasolutionforthechangeintheoutputvoltageduetochangeinwindspeed,whereitprovidesaconstantoutputvoltagewithconstantfrequencyevenifthewindspeedchanged.SomeoftheadvantagesofMCareintroducedinthispaper.TheseadvantagesrepresentedintheoutputfrequencyofMCwhichmaybegreaterthantheinputfrequency,controllingrmsvalueoftheoutputvoltageandtheabilitytocontroltheIDF(inputdisplacementfactor).Attheendofthispapersimulationandexperimentalresultsareintroducedwhichgiveapreciseprooftotheproposedalgorithms.

简介：Inthispaper,aplasmonicsrefractiveindexsensorwiththesemiring-stubsystemcoupledtoabuswaveguideispro-posed.Thestructurecanachievewavelengthbandtunableandultra-sharpFanoresonance.Thecouplingmechanismbetweenthebrightmodeanddarkmodeisinvestigatedindetail,andapparentplasmoninducedtransparency(PIT)isrealizedontheresonancewavelength.Thefullwidthathalfmaximum(FWHM)oftheresonantwavelengthismodulatedbyadjustingthecoupleddistance.Thesensitivityandfigureofmerit(FOM)oftheproposedsensor'canreachupto600nm/RIUand120onthevisibleregion,respectively,andthisperformancecanbehelpfulfordesigningthephotonicintegratedcircuitandopticalcommunication,inaddition,itcanbeappliedforbio-sensing.

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