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简介：Thepolepositionoftheσmesonisdeterminedusingtherecentlyproposednewunitarizationmethodcombinedwiththetwo-loopSU(2)×SU(2)chiralperturbationtheoryresults.Thescatteringlengthparametersandtheeffectiverangeparameterspredictedbyourmethodareingoodagreementwithexperimentalresults.ItisfoundthatMσ=542±26±39MeV,Fσ=546±122±25MeV.

简介：Ifthefrequencyoftheincidentsoundwavecoincideswithoneoftheeigenfrequenciesoftheunderwaterelasticcylinder,thecorre-spondingeigenvibrationwillbeexcitedbyincidentsoundwaveandstronglyreradiatesoundwavetowardssurrondingwater.Ithasbeenre-vealedbypreviousinvestigationsthattheamplitudeofbackscatteringsoundappearstobeminimumattheeigenfrequenciesoftheunderwatermetalliccylindersbecauseofthedestructiveinterferencebetweenreradiatedwaveoftheeigenvibrationandthegeometricalreflectedwavefromsurfaceofthecylinders.Inthispaper,anewphenomenonhasbeenrevealed.Theamplitudeofbackscatteringsoundappearstobemaximumattheeigenfrequenciesofacylindermadefromnonmetallicmaterialinwhichthevelocityofelastictransversewaveislessthanthesoundvelocityinwater.

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简介：ＲｅｌａｘａｔｉｏｎｏｆＩｓｏｓｃａｌａｒＧｉａｎｔＭｏｎｏｐｏｌｅＲｅｓｏｎａｎｃｅ￥ＷｅｎＷａｎｘｉｎ；ＺｈｏｎｇＪｉｑｕａｎａｎｄＪｉｎＧｅｎｍｉｎｇＴｈｅｒｅｌａｘａｔｉｏｎｏｆｔｈｅｉｓｏｓｃａｌａｒｇｉａｎｔｍｏｎｏｐｏｌｙｒｅ...

简介：Waveenergyhasdrawnmuchattentionasanachievablewaytoexploittherenewableenergy.Atpresent,inordertoenhancethewaveenergyextraction,mosteffortshavebeenconcentratedonoptimizingthewaveenergyconvertorandthepowertake-offsystemmechanicallyandelectrically.However,focusingthewavepowerinspecificwavefieldcouldalsobeanalternativetoimprovethewaveenergyextraction.Inthisexperimentalstudy,theBraggresonanceeffectisappliedtofocusthewaveenergy.BecausetheBraggresonanceeffectoftherippledbottomlargelyamplifiesthewavereflection,leadingtoasignificantincreaseofwavefocusing.Achievedwithanenergyconversionsystemconsistingofapointabsorberandapermanentmagnetsinglephaselinearmotor,thewaveenergyextractedinthewaveflumewithandwithoutBraggresonanceeffectwasmeasuredandcomparedquantitativelyinexperiment.ItshowsthatenergyextractionbyapointabsorberfromastandingwavefieldresultedfromBraggresonanceeffectcanberemarkablyincreasedcomparedwiththatfromapropagatingwavefield(withoutBraggresonanceeffect).

简介：正弦电场驾驶的一个蛋白质马达系统被调查。Thesignal-to-noise比率(SNR)在断热的限制被导出。随机的回声的现象被作出对有利的裁决这个蛋白质马达系统。

简介：基于颤动的精力harvester是实质上在一个有限频率范围工作的一个共鸣器。增加工作频率范围是一个挑战性的问题。这份报纸为提高经由内部回声收获的精力揭示新奇可能性。内部回声精力harvester被建议。刺激连续地作为Gaussian白噪音，一个秒顺序过滤器定义的有颜色的噪音，狭窄乐队的噪音，和指数地相关的噪音被假定。相应平均root-mean-square产量电压被计算。数字结果证明内部回声增加操作带宽和产量电压。

简介：Introduction:Mostcochlearimplantsarecurrentlycompatiblewithmagneticresonanceimaging(MRI)upto3T.Nevertheless,thisdoesnotcompletelyeliminatetheriskofseriousaccidents.Implantdisplacementsandotheradverseeventswithcompatibleimplantshavebeenreportedintheliterature.Casereports:AmongthesixpatientswhohadMRIafterreceivingimplantsatourcenter,wereportthreecaseswithadverseeventsrelatedtotheexamination.Thefirstcasewascomplicatedbymagnetdisplacementwithpartialdemagnetization.Thesecondcaseshowedtotaldemagnetization,whichnecessitatedremovalandreimplantationoftheimplant.ThethirdcaseinvolvedseverepainsensationwhichdisruptedtheMRIscan.Thesmallestartifactwasfoundwith3DMRIangiography,andlargestartifactwasfoundwithdiffusionandT2FLASH.Discussion:MovingthepatientintotheMRIapparatusmustbesupervisedbyanotorhinolaryngologyspecialistoranexperiencedradiologist.Itisimportanttoconsiderthemagneticfielddirections,sothatanglebetweentheimplantmagneticfieldsandtheMRIB0alwaysremainslessthanorequalto90°.Inaddition,werecommendtheuseofan"arrowdrawing"tofacilitatetheorientationofthemagneticfielddirections.Furthermore,topreventmagnetdisplacement,werecommendsystematicuseofaprotectivesplintinadditiontobandaging.

简介：AbstractBackground and objective:Functional endoscopic sinus surgery (FESS) increases the nasal volume, and thereby it can alter the nasal resonance. The objectives were to measure the percentage of nasal resonance following FESS and compare it with healthy individuals with normal nasal findings.Methods:The nasometric analysis of voice was done using n/p/m consonant sounds in 72 individuals with healthy post FESS cavities (group 1) and 72 healthy individuals with normal nasal findings without any nasal pathology (group 2). The scores of nasal resonances were expressed in percentages and were compared between the two groups. Both in group 1 and group 2, 32 (44.4%) were females, and 40(55.6%) were males. In group 1, 51 participants had bilateral FESS cavities, and 21 had unilateral FESS cavities. Kannada was the mother tongue in 30 (41.7%) participants in group 1 and 36 (50.0%) in group 2. Malayalam was the mother tongue in 42(58.3%) participants in group 1 and 36 (50.0%) in group 2.Results:In both cases and control groups, more than 80% of the participants were showing less than 20% of nasal resonance. In group 1, the mean values of/n/p/m sounds were 11.23%, 10.23% and 11.42% respectively, and in group 2 the mean values were 8.27%, 8.58% and 8.58% respectively. But the P value was not statistically significant. Individuals with unilateral FESS cavities had more nasal resonance values compared to bilateral FESS cavities. Similarly, Kannada speaking people had more values compared to Malayam speaking individua.Conclusion:Changes in nasal resonance after FESS is minimal, and it is unnoticed. But it may affect the speech quality in professional voice users, depending on their language. Though the nasometer is considered as the most validated instrument to record nasal resonance, we feel that further standardization is needed to evaluate the nasalance.

简介：Ananalyticalstudyofthetwodegreesoffreedomnonlineardynamicalsystemispresented.Theinternalmotionofthesystemisseparatedanddescribedbyonefourthorderdifferentialequation.AnapproximateapproachallowsreducingtheproblemtotheDuffingequationwithadequateinitialconditions.Anovelideaforaneffectivestudyofnonlineardynamicalsystemsconsistinginaconceptofthesocalledlimitingphasetrajectoriesisapplied.Bothqualitativeandquantitativecomplexanalyseshavebeenperformed.Importantnonlineardynamicaltransitiontypephenomenaaredetectedanddiscussed.Inparticular,nonsteadyforcedsystemvibrationsareinvestigatedanalytically.

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简介：周期性地强迫的空间地扩大的Brusselator在混乱政体被调查。我们探索在各种各样的强迫的频率和强迫的振幅下面产生的反响或非反响的模式。反响的空间地一致的摆动和不规则的结构被发现。而且，常规空间模式的二种类型在适当参数下面被产生。我们数字模拟的结果证明周期的力量能给上升在类似于常规摆动的强迫的系统的状况的空间与时间的混乱的强迫的系统撕了浊音模式。

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简介：ThereisagoodcorrelationbetweenanomalousSchumannresonanceandseismicactivities.Pre-earthquakeanomalousSchumannresonanceisanimportantmanifestationofLAIC(Lithosphere-Atmosphere-IonosphereCoupling),whichisprobablyassociatedwithseismicionosphericdisturbance.TheobservationsystemparametersoftheYunnanSchumannresonancemonitoringstationsandtheresultsofstatisticalandseismiccasesanalysisareintroducedinthispaper.ThreedaysbeforetheMarch10,2011MS5.8Yingjiangearthquake,anomalousSchumannresonanceintheBycomponent(E-W)wasobservedbyYongshengstation,andtwodaysbeforetheLincangMS4.0earthquakeofJanuary23,2011,anomalousSchumannresonanceintheBycomponentwasdetectedbythesamestation.SpectrumanalysisresultsontheBycomponentobservationsofTonghaistationshowthatstrongdisturbanceswereobservedinspectraldensitycorrespondingtothefirstthreeSchumannresonantfrequenciesontheverydayoftheMS4.2HongheearthquakeofMay22,2011.ResearchshowsthatSchumannresonancemonitoringisafeasiblemethodforseismic-electromagneticprecursorsmonitoring.

简介：Alargemagnetizedplasmasheetwithsizeof60cmx60cmx2cmwasgeneratedbyalinearhollowcathodedischargeundertheconfinementofauniformmagneticfieldgeneratedbyaHelmholtzCoil.Themicrowavetransmissioncharacteristicoftheplasmasheetwasmeasuredfordifferentincidentfrequencies,incaseswiththeelectricfieldpolarizationoftheincidentmicrowaveeitherperpendicularorparalleltothemagneticfield.Inthismeasurement,parametersoftheplasmasheetwerechangedbyvaryingthedischargecurrentandmagneticfieldintensity.Intheexperiment,upperhybridresonancephenomenawereobservedwhentheelectricfieldpolarizationoftheincidentwavewasperpendiculartothemagneticfield.Theseresonancephenomenacannotbefoundinthecaseofparallelpolarizationincidence.Thisresultisconsistentwiththeoreticalconsideration.Accordingtotheresonancecondition,theelectrondensityvaluesattheresonancepointsarecalculatedundervariousexperimentalconditions.Thiskindofresonancephenomenacanbeusedtodevelopaspecificmethodtodiagnosetheelectrondensityofthismagnetizedplasmasheetapparatus.Moreover,itispointedoutthattheoperatingparametersofthelargeplasmasheetinpracticalapplicationsshouldbeselectedtokeepawayfromtheupperhybridresonancepointtopreventsignalsfrompolarizationdistortion.

简介：Consideringthatinamagneticresonancesystem,ifthedetectioncoilcontributesdominantlytothesystemnoise,theperformanceofthewholesystemcancertainlybeimprovedbyswitchingtoadetectioncoilmadeofahigh-temperaturesuperconductor,andusingYBa2Cu3O7thinfilmson25×25mm^2LaAlO3substrates,wehavepreparedtwokindsofdetectioncoils:single-coilandtwo-coil.encouragingly,theirqualityfactorsaremeasuredtobeQ>2500fortwo-coil(at22.566MHzand77K)andQ>5500forsingle-coil(at92.3MHzand77K),respectively,Here,wedescribethedetailsofthedesign,fabricationandtestingofthecoils.

简介：§I.IntroductionInthispaperwearelookingforsolutionsofthefollowingHamiltoniansystemofsecondorder:wherex=（x1,x2）andVsatisfies（V.1）V:R×R2→RisaC1-function,1-periodicInt,（V.2）Visperiodicinx1withtheperiodT>0,（V.3）V→O,Vx→Oas|x2|→∞,uniformlyin（t,x1）.

简介：Stochasticresonance(SR)phenomenonofthesystemthatissubjecttotheasymmetrictwo-statenoiseisinvestigatedfromthebroadsense.Itisshownthattheamplitudesoftheoutputsignalexhibitthenon-monotonicdependenceontheinputsignalfrequencyω,andtheparametersdescribingtheasymmetrictwo-statenoise,suchasthetransitionrateλ,theorderparameterkdescribingtheasymmetricdegreeofthetwo-statenoise,andthenoisestrengthD.

简介：Thephenomenonofstochasticresonance(SR)inabistablenonlinearsystemisstudiedwhenthesystemisdrivenbytheasymmetricpotentialandadditiveGaussiancolorednoise.Usingtheunifiedcolorednoiseapproximationmethod,theadditiveGaussiancolorednoisecanbesimplifiedtoadditiveGaussianwhitenoise.Thesignal-to-noiseratio(SNR)iscalculatedaccordingtothegeneralizedtwo-statetheory(shownin[H.S.WioandS.Bouzat,BrazilianJ.Phys.29(1999)136]).WefindthattheSNRincreaseswiththeproximityofatozero.Inaddition,thecorrelationtimeτbetweentheadditiveGaussiancolorednoiseisalsoaningredienttoimproveSR.TheshorterthecorrelationtimeτbetweentheGaussianadditivecolorednoiseis,thehigherofthepeakvalueofSNR.