简介:ThenorthernmarginoftheAlxablockisthejunctionofatectonicunits.Fourfirst-ordertectonicunitsaredistinguished:1.theYaganstructuralzonecharacteristicofanimmatureislandarc;2.theZhusileng-Hangwulastructuralzone,whichwasapassivecontinentalmarginintheEarlyPalaeozoicandwastransformedintoanactivecontinentalmarginintheLatePalaeozoic;3.theShalazhastructuralzonecharacteristicofamatureislandarc;4.theNuru-Langshanstructuralzone,whichwasaProterozoicorogenicbeltandlaterevolvedintoanextensionaltranstionalcrustinthePalaeozoic.Theabove-mentionedtectonicunitsdifferremarkablyinsedimentaryformations,magmaticrockassociations,metamorphismandgeochemistryandareboundedbyfaultsbetweenoneanother.
简介:MultistagesuperimposeddeformationhasbeendiscussedsystematicallybasedontheprogressofthestratigraphicsequencesofthenortheasternmarginofYangtzeBlock.Thenew-discoveredfirststagedeformationofthosesequencesoccurredfromthemiddleTriassictotheendofearlyJurassictogetherwithdevelopmentofregionalfolding,whichwasresultedfromthedeepdetachmentshearingtendingtowardNW-WNW.Thefoldsdiptoeastandfalldowntowardwest,andweresuperimposedbythemainstagefolding.Thereafter,aseriesoffoldsweredevelopedwithaxestrendingtowardnortheast.Consequentlynormalfoldsoccurredonthenormallimbswhileoverturnedfoldontheoverturnedlimbsduringthefirststagefolding.ThedetachmentorthrustwasformedfromlateJurassictoearlyCretaceous.DuetotheupliftingofDabieandtheWannanMountainsinthenorthandsouthsides,thebi-directionalthrustingbeltwasformedbygravityflowingfromtheMountainstowardthecenterofthebasinalongthenorthsideofXuanchengandsouthsideofGuichi.Thedeformationgeodynamicswasdiscussedsimplybasedonthenewlyrecognizedinformationaboutthetectonicevolution.
简介:INTRODUCTIONThepaleocontinentalmargins,characterizedbyactivein-teractionbetweenearthcrustandmantle,complicatedtecton-icmoveme...
简介:Forthedirectionofarrival(DOA)estimation,traditionalsparsereconstructionmethodsforwidebandsignalsusuallyneedmanyiterationtimes.Forthisproblem,anewmethodfortwo-dimensionalwidebandsignalsbasedonblocksparsereconstructionisproposed.First,aprolatespheroidalwavefunction(PSWF)isusedtofitthewidebandsignals,thentheblocksparsereconstructiontechnologyisemployedforDOAestimation.Theproposedmethodusesorthogonalizationtochoosethematchingatoms,ensuringthattheresidualcomponentscorrespondtotheminimumabsolutevalue.Meanwhile,thevectorsobtainedbyiterationareback-disposedaccordingtothecorrespondingatomicmatchingrules,sotheextraatomsareabandonedinthecourseofiteration,andtheresidualcomponentsofcurrentiterationarereduced.Thustheoriginalsparsesignalsarereconstructed.Theproposedmethodreducesiterationtimescomparingwiththetraditionalreconstructionmethods,andtheestimationprecisionisbetterthantheclassicaltwo-sidedcorrelationtransformation(TCT)algorithmwhenthesnapshotissmallorthesignal-to-noiseratio(SNR)islow.
简介:Anewpreparationmethodhasbeendevelopedforthermallystableporouspolyimidemicrospheres.Porouspolyimidemicrosphereswerepreparedusingtriblockcopolymersthatconsistedofathermallystablepolyimidederivedfrompyromelliticdianhydride/4,4’-oxydianilineasthecontinuousphaseandathermallylabilepolyetherasthedispersedphase.Spheresofcopolymersweregeneratedinanonaqueousemulsionandthengraduallyheatedtocompletetheimidizationtoformamicrophase-separatedstructure.Subsequently,thermaltreatmentataslightlyreducedpressureremovedthelabileblocksandproducedpores.Undersuitabledecompositionconditions,theporesizeoftheporouspolyimidewasintherangeof200-400nm.
简介:Adifferentialmodulationschemeusingspace-timeblockcodesisputforward.Comparedwithotherschemes,ourschemehaslowercomputationalcomplexityandhasasimplerdecoder.Inthecaseofthreeorfourtransmitterantennas,ourschemehasahigherrateahighercodinggainandalowerbiterrorrateforagivenrate.Thenwemadesimulationsforspace-timeblockcodesaswellasgroupcodesinthecaseoftwo,three,fourandfivetransmitantennas.Thesimulationsprovethatusingtwotransmitantennas,onereceiveantennaandcoderateof4bits/s/Hz,thedifferentialSTBCmethodoutperformthedifferentialgroupcodesmethodby4dB.Useingthree,fourandfivetransmitantennas,onereceiveantenna,andcoderateof3bits/s/Hzareadopted,thedifferentialSTBCmethodoutperformthedifferentialgroupcodesmethodby5dB,6.5dBand7dB,respectively.Inotherwords,thedifferentialmodulationschemebasedonspace-timeblockcodeisbetterthanthecorrespondingdifferentialmodulationscheme
简介:Inthispaper,ablockwiseadaptivesubcarrierallocationalgorithmformultiuserOrthogonalFrequencyDivisionMultiplexing(OFDM)systemisintroduced.Assumingtheknowledgeofchannelinformationforallusers,thealgorithmminimizesthetotaltransmitpowerwhilesatisfyingthetotalpowerandusers'rateconstraints.TheresultofsimulationshowsthattheproposedalgorithmreducestheaveragebitSignal-to-NoiseRatio(SNR)byapproximately4dBcomparedwithOFDM-FrequencyDivisionMultipleAccess(OFDM-FDMA),andsupportsmoreusersinamultiuserRayleighfadingchannel.Asassigningsubcarriersinblock,thecomputationalcomplexityofthealgorithmismuchlowerthanthatofthederivationof"water-filling"algorithm.
简介:块在特征0的域上介绍了Zassenhaus代数学的某些类似物。块类型的无限维的简单谎言代数学由徐构造了的nongraded能被看作块代数学的归纳。在这份报纸,我们为块的谎言代数学与复合一一般线性谎言代数学基于有限维的无法缩减的重量模块打的four-devivationnongraded在鈥減olynomials鈥?上以增加和区别操作员构造无法缩减的模块的一个家庭。我们也发现一些无法缩减的商模块从被获得的submodules的一个新系列。关键词无法缩减的模块-nongraded谎言代数学-块类型先生(2000)的nongraded谎言代数学使分类17B10遭到-17B65由中国(资助号码10701002)的国家自然科学基础支持了
简介:WesimulateGPShorizontalvelocityfieldintermsofrotationsofcrustalblockstodescribedeformationbehavioroftheChinesemainlandanditsneighboringareas.31crustalblocksareboundedprimarilyby~30Quaternaryfaultswithdistinctgeometriesandvariablelong-termratesof<20mm/a,and1683GPSvelocitiesweredeterminedfromdecade-longobservationsmostlywithanaverageduncertaintyof1?2mm/a.WedefineGPSvelocityatasitebythecombinationofmotionofrigidblockandelasticstraininducedbythefaultthatislockingduringaseismiccycle.ModelvelocitiespredictedfromthepreferableblockmodelmatchwellwiththeGPSvelocitiestoanuncertaintyof~1.7mm/a.Theslipratesinferredfromthismodelisinarangeof6?18mm/aforthemajorfaultsinTibetanditsmarginsand1?4mm/aineasternChina,consistentwithgeologicalobservations.Ournumericalsimulationsuggeststhatthecrustalblocksdeforminternallyatalevelof~10×10-9/a,quitesmallincomparisonwithsignificantdeformationlocalizedalongfaultzonesof50?100kmwide.Weconcludethatthepatternofcontinentaldeformationisnotcontinuous-likebutblock-like,andthetenetofplatetectonicsmaybeapplicabletocharacterizetheactivedeformationinAsia.
简介:AclassofQuasi-SystematicBlock-CirculantLow-DensityParity-Check(QSBC-LDPC)codesisproposed.Block-circulantLDPCcodeshavebeenstudiedalotrecently,becausethesimplestructuresoftheirparity-checkmatricesareveryhelpfultoreducetheimplementationcomplexities.QSBC-LDPCcodesarespecialblock-circulantLDPCcodeswithquasi-systematicparity-checkma-trices.ThememoriesforencodersofQSBC-LDPCcodesarelimited,andtheencodingprocesscanbecarriedoutinasimplerecursivewaywithlowcomplexities.ResearchesshowthattheQSBC-LDPCcodescanprovideremarkableperformanceswithlowencodingcomplexities.
简介:<正>TheWorldTourismOrganiza-tionreckonedthatChinawouldemergeastheNo1tourismdestinationinthenextdecades,exceedingSpain,FranceandtheUS.TheRepresentativeoftheWorldTourismOrganizationsaidthattheinternationalintensitythreatenednothingtothetourismofChina.