简介：AdoublehelixmodelofchargetransportinDNAmoleculeisgivenandthetransmissionspectraoffourDNAsequencesareobtained.ThecalculatedresultsshowthatthetransmissioncharacteristicsofDNAarenotonlyrelatedtothelongitudinaltransportbutalsotothetransversetransportofmolecule.Theperiodicsequencewiththesamecompositionhasstrongerconductionability.Withtheincreasingofbasescomposition,theconductiveabilityreduces,buttheweightofθdirectionrisesinchargetransfer.

简介：Influenceofpulsedpowertransmissiononradiowaveenvironmentisinvestigated.Thepowerpulsesaretransmittedintermittentlyinpulsedpowernetworkthatisalreadyproposedforanalternativeofupcomingsmartgrids.Incontrasttoconventionalpowertransmissionwithcontinuouselectriccurrentoflowfrequencysinewave,pulsedpowertransmissionmayaffectsurroundingfieldwithhighfrequencyradionoises.Inthispaper,basedontheanalysisofelectricfieldstrengtharoundapowerline,theradionoisesgeneratedbyvariousformsofpulsedpowertransmissionareevaluated.Asaresult,twopointsarederived.First,thoughthetotalofgeneratedradionoisepowerobviouslyexceedsthatofconventionalpowertransmissions,peakstrengthofelectricfieldratherfallsbehindtheconventionalone.Second,concerningtheinfluenceontheradiowaveofthelowestfrequency40kHzthatisactuallyusedforstandardtimeandfrequencysignal,thenoiseintensitypossiblyexceedstheweakradiosignaltoleranceaccordingtotheshapeofeachpowerpulsetransmitted.

简介：

简介：我们建议plasmonic为提高的光传播弄皱角结构并且理论上分析。它在倾斜的发生使用单向性的宣传表面电浆子电磁声子的改进。象沟深度和宽度那样的几何参数被优化。分析证明它为沟的一个小数字比公牛的眼睛结构介绍更好的表演。

简介：包括的联合计划概括了选择联合的二种选择(GSC)和联合的概括顺序选择(GOSC)被调查。在GSC计划，从R差异分支的一个总数的L最强壮的差异分支被最大的比率联合选择并且协调地联合了。GOSC意味着从R差异分支的Lth最强壮的差异分支为接收被选择。为有GSC和GOSC的最大的比率传播的平均signal-to-noise比率的靠近形式的表情在使隧道褪色的瑞利被导出。

简介：Openwaveguidesarewidelyusedinmodernphotonicdevices,suchasmicrostructuredfiberfiltersandsensors.Theirabsorptionandtransmissionspectraarethemostimportantpropertiesindeterminingtheoverallperformanceofthephotonicdevices.Theimaginarypartsoftheireigenvalueshavebeencommonlyusedtocalculatetheabsorptionandconsequentlythetransmissionspectra.Hereweshowthatthisformulismisgenerallyincorrectandnotconsistentwiththesimulationresultsobtainedbythebeampropagationmethod.Werevisitthefundamentaltheoryfortheabsorptionofopenwaveguidesandpresentageneralformulism.Wefoundthatparity-time-symmetrytransitions,whichhavebeenconventionallyignored,playacriticalroleinthepropertiesofthecoupledwaveguide.Theabsorptionandtransmissionarehighlydependentonthephysicallengthofthesystem.Onthebasisofourfindings,optimizationcriteriafordesigningphotonicsensorsandfiltersarepresented.

简介：Theenergytransmissionofthelongmicrowavepulseforthefrequencyof2.45GHzand5.8GHzisstudiedbyusingtheelectronfluidmodel,wheretheratecoefficientsarededucedfromtheBoltzmannequationsolvernamedBOLSIG+.Thebreakdownthresholdsfordifferentairpressuresandincidentpulseparametersarepredicted,whichshowgoodagreementwiththeexperimentaldata.Belowthebreakdownthreshold,thetransmittedpulseenergyisproportionaltothesquareoftheincidentelectricfieldamplitude.Whentheincidentelectricfieldamplitudehigherthanthebreakdownthresholdincreases,thetransmittedpulseenergydecreasesmonotonouslyatahighairpressure,whileatalowairpressureitfirstdecreasesandthenincreases.Wealsocomparethepulseenergytransmissionforthefrequencyof2.45GHzwiththecaseof5.8GHz.

简介：HL-2Atokamakwillbeequippedwitha75GHz/1MW/1sECRHsystem.Thepaperdescribesthedesignofthetransmissionsystem(Fig.1),whichismadeupwithatransmissionline,anequatoriallauncher.Thepaperdescribesthedesignofmaincomponentsofthesystemsuchas,waveguides,ellipsoidalsurfacemirrors,achemicalvapor(CVD)diamondwindow,asteeringmirror.

简介：

简介：Taperedfiberswithdiametersrangingfrom1to4μmarewidelyusedtoexcitethewhispering-gallery(WG)modesofmicrocavities.Typically,thetransmissionspectrumofaWGcavitycoupledtoawaveguidearoundaresonanceassumesaLorentziandipmorphologyduetoresonantabsorptionofthelightwithinthecavity.Inthispaper,wedemonstratethatthetransmissionspectraofaWGcavitycoupledwithanultrathinfiber(500–700nm)mayexhibitbothLorentziandipsandpeaks,dependingonthegapbetweenthefiberandthemicrocavity.Byconsideringthelargescatteringlossofoff-resonantlightfromthefiberwithinthecouplingregion,thisphenomenoncanbeattributedtopartiallyresonantlightbypassingthelossyscatteringregionviaWGmodes,allowingittobecoupledbothtoandfromthecavity,thenmanifestingasLorentzianpeakswithinthetransmissionspectra.Thisimpliesthesystemcouldbeimplementedwithinabandpassfilterframework.

简介：Thispaperinvestigatestheoreticallytheelectronictransmissionspectraofthethreeterminalpyrenemolecularbridgeandthequantumcurrentdistributiononeachbondbythetight-bindingmodelbasedonnonequilibriumGreen'sfunctionandthequantumcurrentdensityapproach,inwhichoneπmolecularorbitalistakenintoaccountpercarbonatomwhentheenergylevelsandHOMO-LUMOgapareobtained.Thetransmissionspectrashowthattheelectronictransmissionofthethreeterminalpyrenemolecularbridgedependsobviouslyontheincidentelectronicenergyandthepyreneeigenenergy.Thesymmetricalandoscillationpropertiesofthetransmissionspectraareillustrated.Anovelplus-minusenergyswitchingfunctionisfound.Thequantumcurrentdistributionshowsthattheloopcurrentsinsidethepyreneareinduced,andsomebondcurrentsaremuchlargerthantheinputandtheoutputcurrents.Thereasonswhytheloopcurrentsandthelargerbondcurrentsareinducedarethephasedifferenceoftheatomicorbitsandthedegeneracyofthemolecularorbits.ThecalculationsillustratethatthequantumcurrentdistributionsareingoodagreementwithKirchhoffquantumcurrentconservationlaw.

简介：

简介：Forapreviouslysimulatedeight-broadbandnegative-refraction-indexchiralmetamaterial,weuseS-parameterretrievalmethodstodeterminethecomplexeffectivepermittivity,permeability,andtheimpedance.Wealsocalculatethefigureofmerit,whichisdefinedastheratiooftherealandtheimaginaryrefractioncomponents,andcompareitwiththoseoffishnetmetamaterials.Thesimulationresultsshowthatourchiralmetamaterialexhibitshightransmissionandimpedancematchingtoavacuum.Also,wedeterminethattheelectricandmagneticdipolesofthesurfaceplasmonsplayanimportantroleindeterminingthenineresonancefrequencies.Therefore,thisinvestigationprovidesanexperimentalbasisfordevelopingmetamaterialdeviceswithmultipleandbroadresonancefrequencybands.

简介：散布的光被发现在阳极的氧化铝的photonic水晶的传播系列上有大影响。事件光被遵守布拉格法律的分叉的隧道或毛孔的一个常规数组使衍射。传播光的紧张与因为增加的孔，增加蚀刻时间或扩大scatterers减少。紧张的变化和在多孔的氧化铝膜对发生角度的传播系列的剧降的宽度从象胶体的photonic水晶那样的另外的photonic水晶显示出相当不同的特征。[从作者抽象]

简介：Whenadielectricmeta-atomisplacedintoasubwavelengthmetallicaperture,20-foldenhancedelectromagnetictransmissionthroughtheapertureisrealizedatthemeta-atom’sresonantfrequency.Additionally,whentheincidentelectromagneticpowerincreases,thermalenergygatheredbythemeta-atom,whichisconvertedfromelectromagneticlosses,cancausethemeta-atom’stemperaturetoincrease.Becauseofthehightemperaturecoefficientofthemeta-atom’sresonantfrequency,thistemperatureincreasecausesablueshiftinthetransmissionpeak.Therefore,thisfrequency-dependentenhancedelectromagnetictransmissionevenproducesanonlineareffectatlowincidentpowers.Overanincidentpowerrangefrom0to20dBm,measuredandsimulatedspectranearthemeta-atom’sresonantfrequencyshowdistinctlynonlineartransmission.

简介：Wecomprehensivelycharacterizethetransmissionperformanceofm-aryquadratureamplitudemodulation（m-QAM）signalsthroughasiliconmicroringresonatorintheexperiment.Usingorthogonalfrequency-divisionmultiplexingbasedonoffsetQAM（OFDM/OQAM）whichismodulatedwithm-QAMmodulations,wedemonstratelow-penaltydatatransmissionofOFDM/OQAM64-QAM,128-QAM,256-QAM,and512-QAMsignalsinasiliconmicroringresonator.Theobservedopticalsignal-to-noiseratio（OSNR）penaltiesare1.7dBfor64-QAM,1.7dBfor128-QAM,and3.1dBfor256-QAMatabit-errorrate（BER）of2×10-3and3.3dBfor512-QAMataBERof2×10-2.Theperformancedegradationduetothewavelengthdetuningfromthemicroringresonanceisevaluated,showingawavelengthrangeof0.48nmwithBERbelow2×10-3.Moreover,wedemonstratedatatransmissionof191.2-Gbit/ssimultaneouseightwavelengthchannelOFDM/OQAM256-QAMsignalsinasiliconmicroringresonator,achievingOSNRpenaltieslessthan2dBataBERof2×10-2.

简介：Inrealmultiple-inputmultiple-output(MIMO)systems,theperfectchannelstateinformation(CSI)maybecostlyorimpossibletoacquire.Butthechannelstatisticalinformationcanbeconsideredrelativelystationaryduringlong-termtransmission.Thestatisticalinformationcanbeobtainedatthereceiverandfedbacktothetransmitteranddonotrequirefrequentupdate.Byexploitingchannelmeanandcovarianceinformationatthetransmittersimultaneously,thispaperinvestigatestheoptimaltrans-missionstrategyforspatiallycorrelatedMIMOchannels.Anupperboundofergodiccapacityisderivedandtakenastheper-formancecriterion.Simulationresultsarealsogiventoshowtheperformanceimprovementoftheoptimaltransmissionstrategy.

简介：

简介：Pump-probedifferentialreflectionandtransmissionspectroscopyisaveryeffectivetooltostudythenonequilibriumcarrierdynamicsofgraphene.Thereportedsignofdifferentialreflectionfromgrapheneisnotexplicitlyexplainedandnotconsistent.Here,westudythedifferentialreflectionandtransmissionsignalsofgrapheneonadielectricsubstrate.Theresultsrevealthesignofdifferentialreflectionchangeswiththeincidentdirectionoftheprobebeamwithrespecttothesubstrate.Theobtainedtheorycanbeappliedtopredictthedifferentialsignalsofothertwo-dimensionalmaterialsplacedonvariousdielectricsubstrates.

简介：Lattice,charge,orbital,andspinarethefourfundamentaldegreesoffreedomincondensedmatter,ofwhichtheinteractivecouplingderivestremendousnovelphysicalphenomena,suchashigh-temperaturesuperconductivity(high-T_cSC)andcolossalmagnetoresistance(CMR)instronglycorrelatedelectronicsystem.Directexperimentalobservationofthesefreedomsisessentialtounderstandingthestructure-propertyrelationshipandthephysicsbehindit,andalsoindispensablefordesigningnewmaterialsanddevices.Scanningtransmissionelectronmicroscopy(STEM)integratingmultipletechniquesofstructureimagingandspectrumanalysis,isacomprehensiveplatformforprovidingstructural,chemicalandelectronicinformationofmaterialswithahighspatialresolution.Benefitingfromthedevelopmentofaberrationcorrectors,STEMhastakenabigbreakthroughtowardssub-angstromresolutioninlastdecadeandalwaysstepsforwardtoimprovethecapabilityofmaterialcharacterization;manyimprovementshavebeenachievedinrecentyears,therebygivinganindepthinsightintomaterialresearch.Here,wepresentabriefreviewoftherecentadvancesofSTEMbysomerepresentativeexamplesofperovskitetransitionmetaloxides;atomic-scalemappingofferroelectricpolarization,octahedraldistortionsandrotations,valencestate,coordinationandspinorderingarepresented.WeexpectthatthisbriefintroductionaboutthecurrentcapabilityofSTEMcouldfacilitatetheunderstandingoftherelationshipbetweenfunctionalpropertiesandthesefundamentaldegreesoffreedomincomplexoxides.