简介：在无线传感器网络(WSN)当模特儿的名声，许多文学建议了有创造性的名声间接更改方法例如名声集成，打折，变老消除，并且过滤恶意的名声information.However，很少直接讨论了名声update.In这份报纸基于健全统计理论，为WSN的直接更改是建议方法是更合适的proposed.Results表演的在名声的一个否定二名制的分发方法并且

简介：Inthispaper,thephotonicbandgapofphotoniccrystalswithchiralandnegative-indexmaterialsalternatelyisinvestigated.Itisshownthatthiskindofphotoniccrystalexhibitsverywidephotonicbandgap.Thephotoniccrystalswithadefectlayerhaveanarrowdefectmodeinthebandgap,whichcanbeusedasaverygoodfilteringmaterialbychoosingtheparametersofthedefectlayerproperly.

简介：以便在量井思考类型波导解决过多的插入损失和低开／关比率光开关，新奇InGaAs/InAlAs联合了量很好结构被建议。在低应用电场(F=19kV/cm)和低吸收损失的情况中(伪鈮?1.2厘米?1)，一个大否定导致地的折射索引变化(螖n=?0.0134)在操作波长在新奇的联合的量井结构被获得(位=1550nm)。值在上述一样的工作条件上在一口矩形的量井(RQW)由与那相比的超过一～二个数量级是更大的。CLC数字TN365不到资助号码60277034和60436020由中国的国家自然科学基金会支持了

简介：Weintroduceanewmodelofone-dimensional(1D)photoniccrystalcomposedofalternatelyarrangedRHMandLHMlayerswithpositiveandnegativerefractiveindicesrespectively,forwhichthetransmissionspectraofthemodelarecalculatednumericallywiththetransfermatrixmethod,andtheband-gapstructureandthepolarizationpropertiesareanalyzed.Wefoundthattheintroductionofnegativerefractiveindexlayers(i.e.LHMmediumlayers)givesrisetosomepeculiarband-gapstructureandpolarizationpropertiesasfollows.Firstly,theforbiddenbandsareextremelywideandthetransmissionbandsareverysharpwithoutoscillation;andsecondly,thechangeofincidentanglehasdifferentinfluencesontheforbiddenbandsofTEandTMmodes.FortheTMmode,theforbiddenbandwidthdecreasessubstantiallyandfinallyvanishes,andfortheTEmodewithcentralwavelength,thetotalreflectionhappensatanyincidentangle.

简介：Atunablenegativecoefficientband-passmicrowavephotonicfilter(MPF)withimprovedmainlobe-to-sidelobesup-pressionratio(MSSR)byaSagnacinterferometer(SI)isexperimentallydemonstrated.ThenegativecoefficientcharacteristicofMPFisachievedbyusingthephasemodulationtechnology.Thecentralfrequencyoftheband-passMPFistunablecontinuouslybychangingthewavelengthseparationofmulti-wavelengthopticalcarriers.A38-tapnegativecoefficientband-passMPFwhoseMSSRisincreasedbyabout6.371dBisachievedinexperimentbyapodizingthetapcoefficientwiththeSagnacinterferometer.

简介：Thebandgappropertiesofone-dimensionalphotoniccrystalswithadefectlayerofnegativerefractiveindexmaterialsarestudied.Thedefectmodewidthisbiggerthanthatofconventionalone-dimensionalphotoniccrystalswithadefectlayerofpositiverefractiveindexmaterials.Thedefectmodeoftheformerisdifferentfromthatofthelatter,shiftstowardsthedirectionofhighfrequency(shortwavelength),andhasabiggershiftingvelocity.Furthermoretheeffectsonthetransmissionpropertiesoftheformerphotoniccrystalscausedbychangeinthepositionofthedefectlayerofnegativerefractiveindexareinvestigated.Finallytheopticalenhancementoftheformerphotoniccrystalsisalsoinvestigated.