简介：Traditionalmagneto-electricvibrationsensorsandservoaccelerometershavesevereshortcomingswhenusedtomeasurevibrationwherelowfrequencycomponentspredominate.Alowfrequencycharacteristicextensionforvelocityvibrationsensorsispresentedinthispaper.Thepassivecircuittechnology,activecompensationtechnologyandtheclosedcyclepolecompensationtechnologyareusedtoextendthemeasurablerangeandtoimprovelowfrequencycharacteristicsofsensors.ThsesthreetypesoflowfrequencyvelocityvibrationsensorshavebeendevelopedandwidelyadoptedinChina.

简介：低频率(2.72-3.70Hz)在在更高吸收的力量的100mTorr的松驰摆动从主要分泌物房间和圆周的变化时间的光排放被观察。我们与平行连接用槽阻抗的一个电磁的模型解释低频率摆动变化外部电容，包括匹配的网络联合了到系统的电路分析。模型结果在对试验性的观察的一般同意，并且在匹配的条件上显示许多行为依赖者。

简介：高度强制的钴铁酸盐nanoparticles被他们的暂停的直接注射为加热为磁性的过高热综合并且学习进一个强壮的听觉频率的磁场的一个肿瘤和应用。物理(在液体和稳固的分散的动态磁性的磁滞现象和热产生)，生物(在进老鼠肿瘤织物的治疗学的数量的粒子的毒性和穿入)象其它一样，粒子的性质被学习。一个模型被开发为Brownian和常规旋转与一篇报道在磁性的nanoclusters的暂停描述magnetodynamics，到提供观察现象的理解。开发的试验性、理论的技术为低频率的热产生为磁性的nanoparticles的可控制的合成形成了一个基础在医药并且另外的应用程序。

简介：在大气的低频率的波浪上的海洋的强迫的效果(LFW为短)在海洋和空气分别地作为一个独立系统被拿的地方，在热带被分析。在这里，海洋的效果作为蒸发风反馈是parameterized(EWF为短)并且SST强迫。在EWF的调整下面，没有EWF，从那SST戏强迫一个不同角色因此LFW是diabatic飘动，由多重因素的相互作用强迫了，在热带。关键词大气的LFW-海洋的强迫-EWF-放射的冷却-SST这份报纸被鈥?首先支持海洋的科学，州的海洋的管理，地球物理的液体动力学的国家重点实验室和数字建模鈥的研究所？

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简介：85-stationdailyprecipitationdatafrom1961-2010providedbytheNationalMeteorologicalInformationCenterandtheNCEP/NCAR2010dailyreanalysisdataareusedtoinvestigatethelow-frequencyvariabilityontheprecipitationofthefirstrainseasonanditsrelationshipswithmoisturetransportinSouthChina,andchannelsoflow-frequencywatervaportransportandsourcesoflow-frequencyprecipitationarerevealed.Theannuallyfirstrainingseasonprecipitationin2010ismainlycontrolledby10-20dand30-60doscillation.Therainfallismore(interrupted)whenthetwolow-frequencycomponentsareinthesamepeak(valley)phase,andtherainfallislesswhentheyaresuperposedintheinversephase.The10-20dlow-frequencycomponentofthemoisturetransportismoreactivethanthe30-60d.The10-20dwatervaporsourceslieintheSouthIndiaOceannear30°S,theareabetweenSumatraandKalimantanIsland(thesouthwestsource),andtheequatorialmiddlePacificregion(thesoutheastsource),andtherearecorrespondingsouthwestandsoutheastmoisturetransportchannels.Byusingthecharacteristicsof10-20dwatervaportransportanomalouscirculation,thecorrespondinglow-frequencyprecipitationcanbepredicted6dahead.

简介：ObjectiveToassesstheutilityoflow-andhigh-frequencytympanometryinthediagnosisofmiddleeardysfunctioninChineseinfants.MethodsTympanogramswereobtainedwith226Hz,678Hzand1000Hzprobetonesfrominfantsaged5-25weekswithnormalauditorybrainstemresponses(ABRs)(15infants,30ears)andwithprolongedwaveIlatencies(17infants,20ears),suggestingmiddleeardysfunction,usingaGSITympstarmiddleearanalyzerVersionII.ResultsThesingle-peakedtympanogramwasthemostcharacteristictypeinbothgroupsandseenin25ears(83.3%)inthenormalABRgroupandin18ears(90%)inthedelayedwaveIgroup,respectively.Thepeakpressure,peakcompensatedstaticacousticadmittanceandgradientof226Hztympanometrywereofnosignificantdifferencesbetweenthetwogroups.The678Hztympanogramsofadmittance,susceptanceandconductancedemonstratednon-peak,single-,double-andtri-peakedpatternsinbothgroups.TheagreementbetweenABRsand678Hztympanogramsofadmittance,susceptanceandconductancewere70.0%,58.0%and64.0%(kappa=0.324,0.234and0.118)respectively.For1000Hzprobetone,admittance,susceptanceandconductancetympanogramsshowedsinglepeakedpatternsin28(93.3%),25(83.3%)and26(86.7%)ofthe30normalears.Admittance,susceptanceandconductancetympanogramsusingthe1000Hzprobetonewereflatin15(75%),17(85%)and13(65%)oftheearsininfantswithprolongedwaveIlatencies.For1000Hzadmittance,susceptanceandconductanceTympanograms,theagreementbetweentympanometryandABRresultswere90.0%,92.0%and86.0%withkappaat0.783,0.831and0.690,respectively.Conclusion1000Hzprobetonetympanometryisapromisingmiddleearfunctiontestforinfantsof1-6monthsage,while226Hzand678Hzprobetonesarelessefficientindetectingmiddleeardysfunctionininfants.

简介：Anewisolatorcomposedofasteelropespringandamagneto-rheological(MR)damperwasdesignedandastudyonlow-frequencymechanicalcharacteristicsofMRdampersinisolatorswascarriedout.ItusedthecharacteristicsoftheMRdamper,suchasfastresponse,controllabledamping,smallenergyconsumption,widedynamicscope,andgreatadaptation.TherelationshipsbetweenMRdampingforcesandinfluencingfactorswereanalyzedbasedonexperimentaldata.Theresultsshowthatdampingforceisnotonlyrelatedtostructuraldimensions,butalsocloselyrelatedtocontrollablecurrentandvibrationfrequency.Finally,theempiricalformulafordampingforceswascorrected,andtherelationshipbetweencorrectioncoefficientsandfactorsanalyzed.

简介：动态、数字的方法被用来热强迫讨论大气的反应到SST。结果表演为行星的规模系统，热强迫能快速激动的站的SST稳定的大气的平衡状态回答，它被明显的大规模电视连接摆动在东方西方和南方北方方向描绘。为摘要的规模系统，SST热强迫主要使大气的低频率的摆动激动。在SST之间的某基本关系和动态过程热强迫和大气的反应模式被揭示，一些新观点被介绍。

简介：Low-frequencychorusemissionshaverecentlyattractedmuchattentionduetothesuggestionthattheymayplayimportantrolesinthedynamicsoftheVanAllenBelts.However,themechanism(s)generatingtheselow-frequencychorusemissionshavenotbeenwellunderstood.Inthisletter,wereportaninterestingcaseinwhichbackgroundplasmadensityloweredthelowercutofffrequencyofchorusemissionsfromabove0.1fce(typicalordinarychorus)to0.02fce(extremelylow-frequencychorus).Thoseextremelylow-frequencychoruswaveswereobservedinaratherdenseplasma,wherethenumberdensityNewasfoundtobeseveraltimeslargerthanhasbeenassociatedwithobservationsofordinarychoruswaves.Forsuprathermalelectronswhosefreeenergyissuppliedbyanisotropictemperatures,lineargrowthrates(calculatedusingin-situplasmaparametersmeasuredbytheVanAllenProbes)showthatwhistlermodeinstabilitycanoccuratfrequenciesbelow0.1fcewhenthebackgroundplasmadensityNeincreases.EspeciallywhenNereaches90cm^-3ormore,thelowestunstablefrequencycanextendto0.02fceorevenless,whichisconsistentwithsatelliteobservations.Therefore,ourresultsdemonstratethatadensebackgroundplasmacouldplayanessentialroleintheexcitationofextremelylowfrequencychoruswavesbycontrollingthewavegrowthrates.

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简介：在华南海(SCS)的浅南方的翻发行量(MOC)的低频率的可变性为19002010的时期用一个简单海洋数据吸收(苏打)产品被调查。一个动态分解方法在MOC在哪个被分解成Ekman被使用，外部模式，并且垂直砍部件。结果证明所有三个动态部件在SCS贡献季节、年度的吝啬的浅MOC的形成。在SCS的浅MOC由二个房间组成：一顺时针方向在南方的房间和在北方的一个逆时针方向的房间；前者被Ekman流动控制，后者被外部barotropic流动统治，与贡献垂直砍是减少两个房间的大小。另外，在南方的MOC的力量被发现在过去的世纪有一个掉落的趋势，主要对一变弱减少外部部件的运输的吕宋岛海峡运输(LST)到期。进一步的分析建议变弱LST是仔细与一在赤道的太平洋上变弱西的风异例有关，它导致向北赤道的水流(NEC)分叉并且这样的向南方的移动吕宋岛的自台湾东面的菲律宾海流向日本的暖流东方的更强壮的运输。

简介：Severalindolederivativeswithdifferent‘3-'substituentshavebeeninvestigatedbyterahertz(THz)time-domainspectroscopy.Thelow-frequencyabsorptionspectraandrefractiveindiceswereobtainedintherangeof0.2THzto2.5THz(7cm–1to83cm–1).Thesederivativeswithdifferentsubstituentspresentdistinctfeatures,whichsuggeststhatTHzspectroscopyissensitivetodifferentstructuresandcomponentsofthesechemicals.Thedensityfunctionaltheorywasemployedtocalculatethelow-frequencyvibrationalpropertiesofindole-3-carboxylicacidandindole-3-propionicacidbasedontheircrystalstructures,andtheintermolecularinteractionswereinvolved.Meanwhile,thetemperaturedependenceofthespectraagreedwiththecalculatedresults.ThequantitativeanalysisofaternarymixturewasstudiedbytakingtheTHzfingerprintsintoaccount,andtheresultsdemonstrateTHzspectroscopyhasgreatpotentialforthepracticalapplicationsinbiochemistryandpharmaceutics.

简介：InviewofthelimitationsofaRn-GnmodelinthelowfrequencyrangeandthedefectsofanEn-Inmodelincommonusenow,thispaperbuildsacompleteEn-Inmodelaccordingtothetheoryofrandomharmonic.Theparametersforthelow-noisedesignsuchastheequivalentinputnoisyvoltageEns,theoptimumsourceimpedanceZsoptandtheminimumnoisefigureFmincanbecalculatedaccuratelybyusingthisEn-Inmodelbecauseitconsidersthecoherencebetweenthenoisesourcesfully.Moreover,thispaperpointsoutthatitwillcausethemaximum30%miscalculationwhenneglectingtheeffectsofthecorrelationcoefficient7.Usingtheseries-seriescircuitsasanexample,thispaperdiscussesthemethodsfortheEn-InnoiseanalysisofelectroniccircuitspreliminarilyanddemonstratesitscorrectnessthroughthecomparisonbetweenthesimulatedandmeasuredresultsoftheminimumnoisefigureFminofasinglecurrentseriesnegativefeedbackcircuit.

简介：Theprocessofionheatingbyamonochromaticobliquelypropagatinglow-frequencyAlfvenwaveisinvestigated.Thisprocesscanberoughlydividedintothreestages:atfirst,theionsarepickedupbytheAlfvenwaveinseveralgyro-periodsandabulkvelocityinthetransversedirectionisachieved;then,theionsarescatteredinthetransversedirectionbythewave,whichproducesphasedifferencesbetweentheionsandleadstoionheating,especiallyintheperpendiculardirection;andfinally,theionsarestochasticallyheatedduetothesubcyclotronresonance.Inthispaper,withatestparticlemethod,theefficiencyandtimescaleoftheionstochasticheatingbyamonochromaticobliquelypropagatinglow-frequencyAlfvenwavearestudied.Theresultsshowthatwiththeincreaseoftheamplitude,frequency,andpropagationangleoftheAlfvenwave,theefficiencyoftheionstochasticheatingincreases,whilethetimescaleoftheionstochasticheatingdecreases.Withtheincreaseoftheplasmabetaβ,theionsarestochasticallyheatedwithlessefficiency,andthetimescaleincreases.Wealsoinvestigatetheheatingofheavyionspecies(He2+andO5+),whichcanbeheatedwithahigherefficiencybytheobliqueAlfvenwave.

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简介：波浪方程波浪地数字建模技术被用于深层成像在高速度的暗岩的屏蔽的层下面是困难的观察。三个简单高速度的暗岩模型根据暗岩形成特征被设计。低频率的地震信号能够两个都渗透薄高速度的暗岩层并且减少衍射噪音的地震信号精力表演由不平的表面引起了的深层的思考的分析。一个完全的2D暗岩模型的模拟实验证实低频率的信号能被用来在高速度的暗岩层下面增加深层的成像的质量并且在低通行证的过滤器处理实际数据完成好结果。

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