简介：Inthispaper,weconsideraninversescatteringproblemforanobstacleDR^2withRobinboundarycondition.Byapplyingthepointsource,wegivearegularizingmethodtorecoverthescatteredfieldfromthefar-fieldpattern.Numericalimplementationsarealsopresented.

简介：在那里存在，这被证明迪拉克的一个向量代表“在它等价于的一意义的s旋量Geldand双性人四元数(即complexified四元数)表示。这能被看作Cartan的归纳“到迪拉克的triality的s想法”s旋量。在向量表示，一阶的DiracLagrangian对拓扑地巨大的计量器地的two-orderLagrangian双等价物。潜力删除哪个对应于Diracfield被使用主人获得(或父母)行动途径。新奇计量器删除是自我双的并且包含反对称的李和对称的乔丹结构。

简介：与自我纺纱关联和微分操作符技术基于有效地的理论，有简单立方的、以身体为中心的立方，以及以脸为中心的格子上的二轴的水晶地的spin-2系统的物理性质被学习了。Theinfluences外部纵磁性在磁化，内部精力，特定的热，和危险性上删除详细被讨论了。处于扎根的状态的磁化看由二轴的横向的水晶领域生产的量效果的现象被发现了。

简介：Usingbi-spinorfieldswewritethepseudo-scalarandbi-spinorfieldsthatarecharacterizedbythefieldfunctionsofcoordinatesofseveralparticles,namelymulti-particlefields.Byapplyingthequantizationproceduretothesemulti-particlefields,hadroniccreationandannihilationoperatorshavebeenobtained.

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简介：Onenearfieldacousticholography(NAH)techniqueisproposedforanalyzingcyclostationarysoundfield.Thesignalofthiskindofsoundfieldhasveryseriousmodulationphenomenongenerally,inspectrumofwhichobvioussidebandsexist.ItisdifficultforthetraditionalNAHtopossessdemodulationfunction,sovirtualpowerofsidebandsexistsinitshologram.ReplacingtheFourier'stransformwiththesecond-ordercyclicstatistics,theproposedNAHtechniqueusesthecyclicspectrumdensity(CSD)functionasreconstructedphysicalquantity,insteadofthespectrumorpowerspectrumdensityofsoundpressuresignal.TheCSDfunctioncandemodulatecyclostationarysignals,whichmakesnovirtualpowerofsidebandsinitshologram.TheresultsofsimulationandexperimentshowthattheproposedNAHcanextractmoreinformationaboutcyclostationarysoundfieldthantraditionalNAH,bywhichsoundfieldcanbeknownmoreclearly.

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简介：Inthenormal-modetheoryofMorse,itgivesaseriesofnormalmodesasthesolutionofforcedvibrationinaroom.Butactuallythereisalwaysthedirectradiationbesidesthenormalmodeswhichrepresentthereverbrantsoundfieldonly.Thereasonisthatthenormalmodeswereassumedonlyinthesource,andnaturallynormalmodesonlyareobtainedinthesolution.Atheoryofdoublesourceisproposed,thatthesoundsourceisboththesourceofthedirectradiationasifinfreespacebeforetheboundarysurfaceswerereachedbythedirectradiation,andafterthefirstreflectionfromtheboundarysurfaces,thesourceofthereflectedwavelets,randomlydistributedbothinspaceanintimeontheboundarysurfacesthatbuildupthenormalmodesafterfurtherreflections.Thewaveequationisformedaccordingly,andthesolutionofthewaveequation,thesoundfieldinaroom,containsexplicitlyboththedirectradiationandthereverberantsoundformedofnormalmodes.Theapproximatemeansquaresoundpressureisfoundtobethedircetsounddeterminedbythesoundpowerofthesource,andreverberantsounddeterminedbythesoundpowerreducedbyafactorofπ/2,differentslightlyfromtheresultobtainedfromenergyconsideration,ifthesourceispuretone.Thereisessentiallynodifferenceforasourceofbandnoise.

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简介：Itisconsiderednecessarythatanadditionaltermrepresentingthedirectsoundbeintroducedintotheclassicalnormalmodesolutionofsoundfieldinenclosures,toaccordwithpracticeandtomaketheformu-lamoreuseful.

简介：Inanon-freefield,theexistenceofdisturbingsourceswoulddestroythefree-fieldconditionrequiredbynear-fieldacousticholography,andconfusetheidentificationoftargetsourceduetothescatteringeffectcausedbydisturbingsoundfallingonthetargetsource.Tototallyremovetheinfluenceofdisturbingsource,amethodforrecoveringandreconstructingthetargetsoundfieldinanon-freefieldwasproposedbasedontheequivalentsourcemethodandthepressure-velocitymeasurement.Intheproposedmethod,thesoundfieldseparationtechniquewasfirstlyusedtoseparatethemixedsoundfieldintotheoutgoingfieldcomingfromthetargetsourceandtheincomingfieldcomingfromthedisturbingsource.Thenthescatteredcomponentcontainedintheoutgoingfieldwascalculatedbyusingthedisturbingsoundandthesurfaceimpedanceofthetargetsource.Finally,thesoundfieldradiatedbythetargetsourceinafreefieldwasobtainedbysubtractingthescatteredcomponentfromtheoutgoingfieldandwasfurtherusedtoreconstructthesoundfieldofthetargetsource.Theproposedmethodwasnumericallyandexperimentallytestifiedandtheresultsofboththesimulationandtheexperimentdemonstratedthevalidityoftheproposedmethod.

简介：Conventionalperiodicstructuresusuallyhavenontunablerefractiveindicesandthusleadtoimmutablephotonicbandgaps.Aperiodicstructurecreatedinanultracoldatomsensemblebyexternallycontrolledlightcanovercomethisdisadvantageandenablelotsofpromisingapplications.Here,twonoveltypesofopticallyinducedsquarelattices,i.e.,theamplitudeandphaselattices,areproposedinanultracoldatomsensemblebyinterferingfourordinaryplanewavesunderdifferentparameterconditions.Wedemonstratethatinthefar-fieldregime,theatomicamplitudelatticewithhightransmissivitybehavessimilarlytoanidealpuresinusoidalamplitudelattice,whereastheatomicphaselatticescapableofproducingphaseexcursionacrossaweakprobebeamalongwithhightransmissivityremainsequallyideal.Moreover,weidentifythatthequalityofTalbotimagingaboutaphaselatticeisgreatlyimprovedwhencomparedwithanamplitudelattice.Suchanatomiclatticecouldfindapplicationsinallopticalswitchingatthefewphotonslevelandpavesthewayforimagingultracoldatomsormoleculesbothinthenear-fieldandinthefar-fieldwithanondestructiveandlenslessapproach.

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简介：StrengtheninginternationalcooperationisthefocusofChina’sforestrysector’sopeningtotheoutsideworld.Inthepastfewyears,Chinahasconductedvariousformsofcooperationintheforestryindustrywithmanyothercountriesandinternationalorganizationsandthecooperationwillbestrengthenedonthebasisofmutualbenefit.AlleffortsareaimedatexpandingtheopeningofChina’sforestryindustryandupgradingthelevelofforestry

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简介：AfterdescribingthegeneralsituationofChinaSouthernPowerGrid(CSG),thisarticleexpoundsthenecessityforCSGtocarryouttheprogramofsmartgrid,andpointsoutthefavorableconditionsandthekeyfieldstodevelopsmartgrid.Italsoputsforwardnear-termemphases,andgivesrelevantsuggestions.

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