简介：WestudythehomogenizationoftheincompressibleNavier-Stokesequationswithperiodicoscillatingcoefficientinaboundednon-homogeneousmedia.Todothat,weintroduceageneralizedcompensatecompactnessresultandasuitableclassoftestfunctiontothisproblem.Bypassingthelimit,weobtainthehomogenizedmodelofthisproblem.
简介：Weproposeaphotonicstructurestackedsequentiallybyone-dimensionalphotoniccrystalsandcavities.Thewholestructureiscomposedofsingle-negativeanddouble-negativematerials.TheopticalWannier–Starkladder(WSL)canbeobtainedinalowfrequencyregionbymodulatingthewidthsofthecavitiesinorder.Wesimulatethedynamicalbehavioroftheelectromagneticwavepassingthroughtheproposedphotonicstructure.Duetothedispersivecharacteristicsofthemetamaterials,averynarrowWSLcanbeobtained.Thelong-periodelectromagneticBlochoscillationisdemonstratedtheoreticallytohaveaperiodonamicrosecondtimescale.
简介：Advancesinmaterialscienceandmathematicsinconjunctionwithtechnologicalneedshavetriggeredtheuseofmaterialandelectriccomponentswithfractionalorderphysicalproperties.Thispaperconsidersthemathematicalmodelofapiezoelectricwindflowenergyharvestersystemforwhichthecapacitanceofthepiezoelectricmaterialhasfractionalordercurrent-voltagecharacteristics.Additionallythemechanicalelementisassumedtohavefractionalorderdamping.Theanalysisisfocusedontheeffectsoforderofderivativesontheappearanceandcharacteristicsoflimitcircleoscillations(LCO).Itisobtainedthat,theorderofderivativestoenhancetheamplitudeofLCOandlowerthethresholdconditionleadingtoLCO.Thedomainsofefficiencyofthesystemareillustratedinvariousparametersspaces.
简介：Wereportaline-narrowedelectro-opticperiodically-poled-lithium-niobate(PPLN)Q-switchedlaserwithintra-cavityopticalparametricoscillationusingagrazing-incidencegrating,producing8-ns,5-μJpulsesat10-kHzrepetitionratewhenpumpedwitha10-Wdiodelaserat808nm.Theoutputwavelengthiscenteredat1554.3nmwitha0.03-nmspectralwidth.Wavelengthtuningisachievedbyrotatingamirrorandchangingthecrystaltemperature.
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