简介:Westudytheparametricamplificationofelectromagneticallyinducedtransparency-assistedRydbergsix-andeight-wavemixingsignalsthroughacascadednonlinearopticalprocessinahotrubidiumatomicensembleboththeoreticallyandexperimentally.Theshiftoftheresonantfrequency(inducedbytheRydberg-Rydberginter-action)ofparametricallyamplifiedsix-wavemixingsignalisobserved.Moreover,theinterplaysbetweenthedressingeffectsandRydberg-Rydberginteractionsinparametricallyamplifiedmultiwavemixingsignalsarein-vestigated.ThelinearamplificationofRydbergmultiwavemixingprocesseswithmultichannelnatureactsagainstthesuppressioncausedbyRydberg-Rydberginteractionanddressingeffect.
简介:WepresentanF-expansionmethodforfindingperiodicwavesolutionsofnonlinearevolutionequationsinmathematicalphysics,whichcanbethoughtofasaconcentrationofextendedJacobiellipticfunctionexpansionmethodproposedrecently.ByusingtheF-expansion,withoutcalculatingJacobiellipticfunctions,weobtainsimultaneouslymanyperiodicwavesolutionsexpressedbyvariousJacobiellipticfunctionsforthevariantBoussinesqequations.Whenthemodulusmapproaches1and0,thehyperbolicfunctionsolutions(includingthesolitarywavesolutions)andtrigonometricsolutionsarealsogivenrespectively.
简介:我们学习二维(2D)在吝啬地的模型的事波浪solitons在2D空间与远程的quadrupolequadrupole相互作用(QQI)由电的四极粒子形成了。在空间的2D事波浪solitons的存在用2DGrossPitaevskii方程(GPE)被预言。我们发现QQIsolitons比dipoledipole相互作用(DDI)有一个更高的团(更小的尺寸和更高的紧张)和更强壮的anisotropy在一样的环境参数下面的solitons。在在2D空间的二相同QQIsolitons之间的各向异性的solitonsoliton相互作用被学习。而且,稳定的各向异性的偶极子solitons被观察到我们的知识,第一次在在各向异性的非局部的立方的非线性下面的2D空间。
简介:Afloatingtypependulumwaveenergyconverter(FPWEC)witharotaryvanepumpasthepowertake-offsystemwasproposedbyWatabeetal.in1998.Theyshowedthatthisdevicehadhighenergyconversionefficiency.Inthepreviousresearch,theauthorsconducted2DwavetanktestsinregularwavestoevaluatethegeneratingefficiencyofFPWECwithapowertake-offsystemcomposedofpulleys,beltsandagenerator.Asaresult,theinfluenceoftheelectricalloadonthegeneratingefficiencywasshown.Continuously,theloadcharacteristicsofFPWECarepursuedexperimentallybyusingtheservomotorstochangethedampingcoefficientinthispaper.Inalaterpartofthispaper,themotionsofthemodelwiththeservomotorsarecomparedwiththatofthecasewiththesamepowertake-offsystemasthepreviousresearch.Fromtheaboveexperiment,itmaybeconcludedthatthemaximumprimaryconversionefficiencyisachievedashighas98%attheoptimalload.
简介:Inthispaper,anextendedmethodisproposedforconstructingnewformsofexacttravellingwavesolutionstononlinearpartialdifferentialequationsbymakingamoregeneraltransformation.Forillustration,weapplythemethodtotheasymmetricNizhnik-Novikov-VesselovequationandthecoupledDrinfel'd-Sokolov-WilsonequationandsuccessfullycoverthepreviouslyknowntravellingwavesolutionsfoundbyChen'smethod[Y.Chen,etal.Chaos,SolitonsandFractals22(2004)675;Y.Chen,etal.Int.J.Mod.Phys.C4(2004)595].
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简介:Electroncyclotronresonanceheating(ECRH),suchasthefundamentalheatingandthesecondharmonicheating,isabasicandpowerfulmethodtoheattheplasmaintokamakandstellaratordevices.Theoreticalstudiesofthisheatinghasbeendoneinratherearlyliteratures,however,theunderstandingofsomeimportantproblemsisstilluncertain.Theseinclude:thecouplingoftheO-modeandtheE-modeandtheroleofthiscouplinginwavedamping,theO-modedampingmechanism,
简介:在一个二维的方形的数组的螺线波浪的开发由于部分离子隧道块(钾,钠)被调查,节点的动力学被HodgkinHuxley神经原描述,这些神经原最近被结合邻居连接。参数比率xNa(并且xK),它定义钠(钾)的工作离子隧道数字的比率到钠的全部的离子隧道数字(并且钾),被用来测量隧道块导致的移动传导力。在二参数的阶段空间(参数比率对毒害的区域)的统计可变R的分发广泛地被计算为部分离子隧道块导致的螺线波浪的转变标记参数区域,有同步R的更小的因素的区域被联系那个螺线波浪使明白毒害的隧道、柔韧的参数区域。当毒害的区域(钾或钠)和沉醉的度是小的时,螺线波浪保持活着,不同转变(死亡,几个螺线波浪共存或多手臂螺线波浪出现)发生在中等比率xNa下面(并且xK)当堵住的区域的尺寸超过某些阀值时。螺线波浪的决裂发生,螺线的多手臂飘动当隧道噪音被考虑时,被观察。
简介:Theanglecompensationmethodisadoptedtodetectsloshingwavesbylaserdiffraction,inthecasethatthewavelengthofthesloshingwavesismuchgreaterthanthatoftheincidentlight.Thecleardiffractionpatternisobservedtobeofasymmetry,involvingorders,positionandintervalofthediffractionspotsthatarediscoveredduringthelightgrazingincidence.Itisfoundthatthelargertheangleofincidenceis,themoreobvioustheasymmetryis.Thehigherthenegativediffractionordersare,thesmallertheintervalsbetweenspotsare.Onthecontrary,inthepositiveregion,thehigherthediffractionordersare,thelargerthespotintervalsare.Thepositiveintervalislargerthanthatofthesamenegativediffractionorder.Iftheincidentanglereaches1.558radintheexperiment,allpositivediffractionorderscompletelyvanish.BasedonthemechanismofphasemodulationandwiththeFouriertransformmethod,therelationsbetweentheincidentangleandposition,intervalspaces,andordersofdiffractionspotsarederivedtheoretically.Thetheoreticalcalculationsarecomparedwiththeexperimentaldata,andthecomparisonshowsthatthetheoreticalcalculationsareingoodagreementwiththeexperimentalmeasurement.
简介:Weexperimentallydemonstratetheopticalpropertiesofgratingsengravedinasingle-modewaveguidefabricatedontopofadielectricmultilayerplatform.ThestructurecanbeapproachedasareflectorforBloch-surface-wavebasedtwo-dimensionalopticalsystems.Thegratingshavebeenfabricatedonathin(~λ∕25)titaniumdioxidelayerwithathicknessofafewtensofnanometersdepositedonthetopofamultilayerplatform.Theopticalpropertiesofthegratingshavebeencharacterizedinthenearfieldwiththeaidofmulti-heterodynescanningnearfieldopticalmicroscopy.Weinvestigatethesurfacewave’sinterferencepattern,producedbyincidentandreflectedlightinfrontofthegratings.ThepresentedgratingsbehaveasanefficientBloch-surface–wave-basedreflectorattelecommunicationwavelength.