简介：Anumericaldesignonthetriangularphotoniccrystalfiber(PCF)basedbackwardmulti-pumpRamanamplifierispresented.ItisdemonstratedthathighflatRamangaincanbereachedbasedonPCF.InfluencesofdifferentgeometricparametersandgermaniumdopingconcentrationsontheRamannetgain,amplifiedspontaneousemission(ASE)noiseanddoubleRayleighbackscattering(DRBS)ofthesignalhavebeenanalyzed.ForoptimizingcrystalfiberRamanamplifier(FRA),thereistradeoffbetweenthegeometricparameterandgermaniumdopingconcentrationoftriangularPCF.TheresultsshowthatPCFisanappropriatecandidateforhighgainRamanamplifiers.

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简介：Inthispaperthepropertiesofspace-timecorrelationfunctionofthenoisefieldofmovingsourceinlayeredstatisticinhomogeneousmediumarestudiedandtheeffectsofrandomfluctuatingboundaryarecon-sideredaswell.Ithasbeenshown,theoreticallyandexperimentally,multi-pathpropergatingeffectscausethedispersionofthecorrelationfunctionandfluctuationsofthemediumrefractionindexandtheboundarycausethefluctuationofit.Theeffectofthemovementofthenoisesourceontheoutputofreal-timecorrelatorisequivalenttoalow-passfilteraddedthedriftofspace-timecorrelationfunction.Thesepropertiesofthecorrelationfunctioncausegravedegradationofthesignalprocessinggainofnoiserangingsonarsystem.Thefluctuatingandthedistortionofconrrelationfunctionmadeitdifficulttorealizethenoiseranging.Sointhispaper,amethodofspacecorrelationrangingbyalineararrayoffourpointswithshortseparationandlongspanandatechnigueofdual-correlationsignalp

简介：联合测量系统的一个分布式的极化模式被设计并且实现了使用白轻interferometry。它能被用于极化模式在多达1km的high-birefringence纤维联合的测量。这个系统能在光纤的传感器和光纤维通讯中被使用。小浪变换在处理改进signal-noise-ratio的数据被采用。这个系统的signal-noise-ratio被改进在降噪以后的超过15dB。在signal-noise-ratio和测量精确性上降噪阀值的影响也被讨论。Hilbert变换和非线性的回归能与小浪变换一起被使用提高signal-noise-ratio和这个系统的空间分辨率。关键词小浪变换-降噪-极化CLCTN253-TP212.14这个工作被国家自然科学资金支持中国(号码60377031)，中国(号码2003CB314907)的国家基本研究程序，和为大学里的新世纪优秀才能的程序。

简介：Anideaofestimatingthedirectsequencespreadspectrum(DSSS)signalpseudo-noise(PN)sequenceispresented.WithouttheapriorityknowledgeabouttheDSSSsignalinthenon-cooperationcondition,weproposeaself-organizingfeaturemap(SOFM)neuralnetworkalgorithmtodetectandidentifythePNsequence.Anon-supervisedlearningalgorithmisproposedaccordingtheKohonenruleinSOFM.TheblindalgorithmcanalsoestimatethePNsequenceinalowsignal-to-noise(SNR)andcomputersimulationdemonstratesthatthealgorithmiseffective.Comparedwiththetraditionalcorrelationalgorithmbasedonslip-correlation,theproposedalgorithm’sbiterrorrate(BER)andcomplexityarelower.

简介：Objective:TodemonstratetheperformancebenefitoftheAutomaticSceneClassifier（SCAN）algorithmavailableintheNucleus6（CP900series）soundprocessoroverthedefaultprocessingalgorithmsofthepreviousgenerationNucleus5（CP810）andFreedomHybridTMsoundprocessors.Methods:Eighty-twocochlearimplantrecipients（40Nucleus5processorusersand42FreedomHybridprocessorusers）listenedtoandrepeatedAzBiosentencesinnoisewiththeircurrentprocessorandwiththeNucleus6processor.Results:TheSCANalgorithmwhenenabledyieldedstatisticallysignificantnon-inferiorandsuperiorperformancewhencomparedtotheNucleus5andFreedomHybridsoundprocessorsprogrammedwithASCtADRO.Conclusion:TheresultsofthesestudiesdemonstratethesuperiorperformanceandclinicalutilityoftheSCANalgorithmintheNucleus6processorovertheNucleus5andFreedomHybridprocessors.

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简介：Onthehypothesisthattheturbulentflowispracticallynotaffectedincharacterbypulsationoftheflow,theformulaforsoundpressurelevelofpulsedjetnoiseisobtainedin90°directionand1meterawayfromthenozzle.Thesteadyjetnoiseis,then,aspecialcasewhenthepulsatingfrequencyiszero.Theresultsagreewellwithexperiments.

简介：传统的财务分析认识通常以流动比率和速动比率来衡量企业的短期偿债能力，有些企业的流动资产变现能力存在很大的问题，然而，以流动资产和速动资产计算出的流动比率和速动比率有时会在很大程度上误导投资者和债权人，导致投资失误和不能回收到期债务。如何分析这一现象？本文通过对流动比率以及速动比率分析陷阱的探讨，期望找到可以真实地反映企业资佥状况和偿债能力的方法，使投资者和债权人得到真实的信息。

简介：读故事，制造声音，并帮Zog解决怪物谜团。

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简介：类固醇作为在动物和植物表明分子工作。当动物类固醇荷尔蒙被抄写因素的原子受体家庭察觉时，在植物的brassinosteroids(BR)被房间表面受体kinase察觉，BRI1。最近的研究证明了到BRI1的细胞外的域的那BR绑定与另一受体kinase导致kinase激活和dimerization，BAK1。激活的BRI1或BAK1然后调整，可能间接地，BIN2kinase的活动或BSU1磷酸酶，它直接调整phosphorylation地位和二个相应抄写因素，BZR1和BES1的原子累积。BZR1和BES1直接绑在BR应答的基因的倡导者调整他们的表示。表明小径的BR为在一般来说由房间表面受体发信号的植物和类固醇发信号的两受体kinase成为了一个范例。

简介：财务比率分析是企业财务分析的一个重要内容。它通过比率排除了时间及报表数字绝对大小的影响,从而有利于比较不同时期、不同企业之间的经营业绩。财务比率可分为:表明企业偿还短期债务能力的流动性比率;表明企业利用已有的资产从事正常生产经营效率的资产效益比率;表明企业应付

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简介：Onthebasisofspectrummomentdescriptionofasignal,evolutionaryvectorisdeveopedtodescribeslowlytime-varyingnoiseprocesses.Itdescribesthemaintime-varyingpropertiesofasignal.Applicationstoaircraftflying-overnoisearepresented.

简介：Intheprocessofdevelopingandadjustingtheproductinthisproject,weneedsomesignalsources,whichusuallyaffordsquareorsinewave.Generallythesquarewareisusedfordigitlogic,butfortheanalogsignalwaveisusedtojudgethelinearity'squalitiesandotherfunctionsoftheelectriccircuit.Howeverthecommonready-madesignalsourceisallunidirectionalsinewave,thesignalsourceswhosephaseshiftcanarbitrarilyberegulatedandwhichhaveprecisephasearestillnotavailableonethecurrentmarket.

简介：signal可作名词和动词。作名词时意为“信号”,作动词时意为“发信号”。【经典例句】Aredlightisusuallyasignalfor/ofdanger.红灯通常是危险的信号。Hesignaled(to)thewaitertobringthemenu.他示意服务员把菜单拿过来。

简介：Anewiterativemethodforsignal,restorationhasbeenpresented.AnestimateoperatorW_κwhichisrelatedtoerroroperatorB_κintherestorationprocessisintroducedtodecreasetheestimateerrorandincreasetheconvergencerate.Theeffectofnoiseontheestimateprocesshasalsobeendescribed.Finally,themethodhasbeenappliedtothedeconvolutionofablurredsignal,andtheresultsvalidatethemethod.Acomparisonbetweenthepresentedmethodandthegeneralmethodhasalsobeengiven.

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