简介：Theproblemofbearingestimationofcoherentsignalimpingiogonanarrayofarbitrarygeometryisstudied.Bothapproachesaredeveloped,thefirstonesynthesizestheobservedarraydataintotheoutputsofalinearuniformarrayandthenprocessesthemviaconventionaltechniquessuchasspatialsmoothingetc.Thesecondapproachisbasedontheinvariantsubspacerotationoperationwhichisequivalenttothetranslationaldisplacementoftheartay,linearlyindependentsignalvectorsareobtainedtherebytospanperfectlythesignalsubspace.Ascomparedwiththeconventionalprocessingtechniques,theapproachbasedoninvariantsubspacerotationdoesnotleadtoaneffectivedecreaseinaperturesizeandthereforeadecreaseinresolutioncapability.Thecomputersimulationsareconductedtodemonstratetheeffectivenessofthepresentedapproaches.

简介：AbstractBackground:Brain arteriovenous malformations (BAVMs) are abnormal vessels that are apt to rupture, causing life-threatening intracranial hemorrhage (ICH). The estimated prevalence of BAVMs is 0.05% among otherwise healthy individuals. In this study, we aim to investigate the mutational spectrum of syndromic genes in sporadic BAVM.Methods:We recruited a cohort of 150 patients with BAVM and performed whole-exome sequencing on their peripheral blood DNA. To explore the mutational spectrum of syndromic genes in sporadic brain arteriovenous malformation, we selected six genes according to the Online Mendelian Inheritance in Man (OMIM) and literature. All variants in the six candidate genes were extracted and underwent filtering for qualifying variants.Results:There are a total of four patients with rare variants in hereditary hemorrhagic telangiectasia-related genes. In addition, we identified two patients have the variant of RASA1 gene in our database, which are also rare mutations that are absent from population databases. However, we did not find any patients with GNAQ mutations in our database.Conclusions:In conclusion, we demonstrated that variants in syndromic vascular malformations play important roles in the etiology of sporadic BAVM.

简介：ThepumpedsystemoftheXeC1excimerlaserhasbeendesignedandappliedtoanalyzeUVXeCllaserspectroscopycharacteristics.UndertheproportionofmixedgasofHCl:Xe:He=0.1%:1%:98.9%,excimerlaserlightwasgeneratedbystableglowdischargeprocess.Thelaserspectrum,pulseduration,andlaserpowerpropertieswereobtained.TheresultshowsthatthisXeClexcimerlaserexhibitsuniquespectralproperties,withtwopeaksbetween307.7nmand308.5nmathighpressurewithapumpedpowerof1.3959MW/cm~3.ThetransitionreliesonthestrongesttransitionsbetweenB-XandC-X.Themaximum-intensitytransitionofspectroscopyisBtoXenergylevels.Thelaserparametersareasfollows:minimaldurationof15.42ns,arepetitionratefrom0.5Hzto5Hz,singlepulsestablepowerof400mJ,andbeamdivergenceangleof3mrad.ThelasercanbeusedtostudyUVspectroscopy,laserablationsamplingandsputteredpinnateform.

简介：Multitaper光谱比传统的periodogram有更低的变化。到吵闹的信号光谱比率(NNSR)的噪音光谱和噪音从吵闹的信号的multitaper光谱被估计；为计算掩盖阀值的噪音的预先提高的讲话被获得由光谱振幅减法方法，其获得是NNSR的功能；最后的提高的讲话被与合并掩盖阀值的噪音的psychoacousticalweighting规则压制吵闹的讲话的Fourier光谱获得。因为multitaper光谱的低变化特征，一个修改偏移量公式被建议计算掩盖阀值的噪音，因此，有这修正的重建的讲话在MBSD有改进(修改吠叫光谱失真).When不到一统治到psychoacousticalweighting的最大的限制进一步被建议，更高输入SNR(0dB)是，部分SNR和全面SNR有的更多的改进。非正式的听测试证明几乎为由建议方法的提高的语音处理没有很少讲话失真，背景噪音很并且没有音乐的噪音被减少。

简介：Thestatisticcharacteristicsofchaoticsequencesgeneratedbyimprovedlogistic-mapareanalyzedanditisfoundthatimprovedlogistic-mapchaoticsequenceshavegoodcorrelationandtheycanbeusedasaddresssequencesinspread-spectrumcommunication.Thediscrete-timesynchronizationofHenonmapisimmediate.Weapplythediscrete-timesynchronizationtochaoticspread-spectrumcomuunicationandproposeanoriginalcommunicationscheme.Thesimulationshowsthattheapplicationissuccessful.

简介：Theradarechosignalofaseaclutterisnonlinear,nonstationaryandtimevarying.Amultifractalmeasureanalysiscandescribethelocalsingularityofaphysicssystem.Therandomwalkmodelofaseaclutterscatteringisanalysedtodisclosetheintrinsicphysicalcharacteristicsandlawsoftheseaclutter.Stochasticdifferentialequationsaregivenforthephysicalqualityoftheseaclutter.AdiffusionprocessmodelisestablishedusingItoformula.Thesingularityoftherandomwalkmodelistestedbyamultifractalspectroscopy,andtheaccuracyofthismodelisprovenbythemultifractalspectroscopyofareal-lifeIPIXradardataset.Thus,therandomwalkmodeliseffectivefordescribingthedynamicsmechanismoftheseaclutter.

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简介：RandomMatrixTheory(RMT)isavaluabletoolfordescribingtheasymptoticbehaviorofmultiplesystems,especiallyforlargematrices.Inthispaper,usingasymptoticrandommatrixtheory,anewcooperativeMultiple-InputMultiple-Output(MIMO)schemeforspectrumsensingisproposed,whichshowshowasymptoticfreepropertyofrandommatricesandthepropertyofWishartdistributioncanbeusedtoassistspectrumsensingforCognitiveRadios(CRs).SimulationsoverRayleighfadingandAWGNchannelsdemonstratetheproposedschemehasbetterdetectionperformancecomparedwiththeenergydetectiontechniqueseveninthecaseofasmallsampleofobservations.

简介：Basedupontheone-yearwindwavemeasurementdata,collectedfromtheSouthChinaSea(SCS)atcoordinates20°36.298?N,110°45.433?E.byAcousticWaveAndCurrent(AWAC),weanalyzedthewavecharacteristicsandconcludedthatthemostcommonwavedirectionwasEandthesecondmostcommondirectionwasENE,themeanandthemaximumvaluesofsignificantheightwas1.2mand4.36m,respectively.Themeanperiodwas4.0s.Wealsoevaluatedthewavespectrumsunderconditionsexistinginthreetyphoons:Rumbi,JetiandUtor.Wefoundthatunimodalspectrumsoccurredmoreoftenthanothers,andthemaximumspectrumpeakwas30.7911m2s.Theminimumpeakfrequencywas0.0625Hz,andthemeanpeakfrequencywas0.126Hz.Thewaveperiodisimportantforthedesignofmarinestructures,especiallythepositionofpeakfrequencyhadagreatinfluenceonthestresscalculation.Spectralanalysisshowedthatthevaluesofpeakfrequencydistributedbetween0.063Hzand0.217Hz,withthemeanvalue0.114Hz.Wefitthenormalizedspectrumwith6theoreticalspectralmodels,outofwhich,theWenspectrum,JONSWAPspectrumandWallopsspectrumwereprovedtogivethebestfit.WhatdistinguishedtheWenSpectrumfromtherestwasthatitdoesnotrelyonthemeasuredspectrumforparameterestimation.Hence,werecommendthattheWenspectrumshouldbewidelyusedinmarineconstruction.

简介：Multispecies生态的模型被用于预言捞活动并且评估管理策略的表演的效果。尺寸光谱模型是组织physiologically的生态的模型的一种类型提供一条可行途径给以单个饮食的变化和个体发生的壁龛移动描述鱼社区。尽管有在改进我们生态系统的理解的生态的模型的潜力，他们的申请通常为数据穷人渔业被限制。作为在实现基于生态系统的渔业管理(EBFM)的第一步，这研究在Haizhou海湾为鱼社区造了一个尺寸光谱模型，中国。我们描述数据收集过程和模型parameterization为数据穷人生态系统的未来研究便于如此的尺寸光谱模型的实现。在生态系统上钓鱼的效果与捞努力的一个范围被例示并且与一套生态的指示物被监视。全部的社区生物资源，生物多样性索引，W统计数值，LFI(大鱼索引)，MeanW(吝啬的身体重量)和斜坡(社区尺寸系列的斜坡)响应捞压力显示出一个强壮的非线性的模式，并且最大的钓鱼的努力没在某些情形产生最激烈的回答。我们强调开发尺寸光谱模型捕获生态的动力学并且为模型改进象潜力一样建议限制的价值和可行性。这研究试图在EBFM的支持支持这类模型的宽使用。

简介：ThePMD-inducedpulsebroadeningmaycausethedegradationofreceiversensitivityandhasnegativeeffectsonthepowerspectrumofreceivedsignals.TheexpressionsofPMD-inducedpulsebroadeningeffectsonreceiversensitivityarederivedbasedontheconceptofmeansquarepulsewidth.TheeffectsofPMDonthespectrumofreceivedpowerareanalyzedindetail.Finally,theschemeisdiscussedwithwhichthepowerofacertainfrequencycomponentisextractedasafeedbackcontrolsignalinaPMDcompensationsystem.

简介：这份报纸论述一个新方法学习在橘子皮之间的相互作用，由吸收spectrum.The作者的啤酒从橘子皮的吸收系列和橘子皮和啤酒的混合在某波浪乐队上探索变化法律和吸收度的差别。尽管吸收度二件样品珍视，在323nm附近有明显的差别的结果表演在大多数乐队是几乎类似的。混合的吸收度价值显然比在在系列的276nm的橘子皮的大，并且有在混合的吸收光谱的山峰位置的移动，它显示出吸收度价值的差别和二件样品的山峰位置。通过比较二件样品的吸收系列的特征，为研究橘子皮的新药理学行动的一个新方法在这篇论文被介绍。结果显示光谱分析的技术将在中国草药的药理学和新药理学的研究和发展起一个重要作用。

简介：TwoLatinsquaresofordervarer-orthogonaliftheirsuperpositionproducesexactlyrdistinctorderedpairs.Thetwosquaresaresaidtober-orthogonalidempotentLatinsquaresanddenotedbyr-MOILS(v)iftheyareallidempotent.Inthispaper,weshowthatforanyintegerv≥28,thereexistsanr-MOILS(v)ifandonlyifr∈[v,v~2]\{v+1,v~2-1}.

简介：麦克风基于数组的讲话改进为讲话通讯和语音识别有大重要性。为了减少麦克风数组的孔并且增加，讲话改进的效果将极大地拓宽麦克风数组的申请区域。抵抗适应噪音取消方法因此是的数组串音介绍了。然后一改善光谱减法算法进一步被串联获得更好的改进结果。当它同时完成更高的SNR改进时，理论上的分析和实验显示建议计划需要一个仅仅很小的麦克风数组。而且，建议计划能在许多吵闹的环境被使用并且为即时实现是容易的。

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简介：Todealwiththenon-Gaussiannoiseinstandard2-DSARimages,thederampedsignalinimagingplane,andthepossiblesymmetricdistributionofcomplexnoise,thefourth-ordercumulantofcomplexprocessisintroducedintoSARtomography.WiththeestimatedARparametersofARMAmodelofnoisethroughYule-Walkerequation,thesignalseriesofheightispre-filtered.Then,throughESPRIT,thespectrumisobtainedandtheapertureinheightdirectionissynthesized.Finally,theSARtomographyimagingofsceneisachieved.Theresultsofprocessingonsignalwithnon-Gaussiannoisedemonstratetherobustnessoftheproposedmethod.Thetomographyimagingofthescenesshowsthatthehigher-orderspectrumanalysisisfeasibleintheapplication.

简介：Wereportourlatticesimulationonthecharmoniumspectrainthequenchedapproximation.Becausethecompleteadjustmentonallthenonperturbativeparametersneedsmuchcalculationtime,weonlyadjusttwoofthem,butwithsomerescalingformasssplitting.Aftertherescaling,thecalculatedmassesofmesonare3.030GeV(ηc),3.080GeV(J/ψ),3.546GeV(he)and3.412GeV(Xco)respectively,whichisinagreementwiththeexperimentalresults.

简介：一个明确的有限差别方法被执行在粘弹性的地点的地震反应上评估地形学效果的意义。真实accelerograms和地狱形状推动小浪，到来的波浪的光谱性质上的峡谷和入射角的斜坡角度都详细被讨论。结论证明地志的因素和这个事件的方向的存在不仅显著地飘动影响一个地点的山峰地面加速，而且在事件波浪的方向上影响到来的波浪，和效果的光谱性质是特别显著的。学习也发现在波浪运动的有限元素模拟与推动小浪的输入分析光谱性质是合理的。

简介：S波浪介子的集体光谱在相对论的泛音模型(RHM)的框架工作被考虑。在调查使用的完整的Hamiltonian加一个向量泛音振荡器潜力，confined-one-gluon-exchange潜力(COGEP)和导致instanton的夸克反夸克相互作用(III)有Lorentz数量。对集体光谱的好描述被获得。在S波浪介子光谱的III和COGEP的各自的角色被讨论。