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简介：Asimplifiedmultisupportresponsespectrummethodispresented.Thestructuralresponseisasumoftwocomponentsofastructurewithafirstnaturalperiodlessthan2s.Thefirstcomponentisthepseudostaticresponsecausedbytheinconsistentmotionsofthestructuralsupports,andthesecondisthestructuraldynamicresponsetogroundmotionaccelerations.Thismethodisformallyconsistentwiththeclassicalresponsespectrummethod,andtheeffectsofmultisupportexcitationareconsideredforanymodalresponsespectrumormodalsuperposition.Iftheseismicinputsateachsupportarethesame,thesupportdisplacementscausedbythepseudostaticresponsebecomerigidbodydisplacements.Theresponsespectruminthecaseofmultisupportexcitationsthenreducestothatforuniformexcitations.Inotherwords,thismultisupportresponsespectrummethodisamodificationandextensionoftheexistingresponsespectrummethodunderuniformexcitation.Moreover,mostofthecoherencycoefficientsinthisformulationaresimplifiedbyapproximatingthegroundmotionexcitationaswhitenoise.Theresultsindicatethatthissimplificationcanreducethecalculationtimewhilemaintainingaccuracy.Furthermore,theinternalforcesobtainedbythemultisupportresponsespectrummethodarecomparedwiththoseproducedbythetraditionalresponsespectrummethodintwocasestudiesofexistinglong-spanstructures.Becausetheeffectsofinconsistentsupportdisplacementsarenotconsideredinthetraditionalresponsespectrummethod,thevaluesofinternalforcesnearthesupportsareunderestimated.Theseregionsareimportantpotentialfailurepointsanddeservespecialattentionintheseismicdesignofreticulatedstructures.

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简介：不同于在行星的边界层的风骚乱光谱上的以前的研究，这调查集中于高高度(15km)在各种各样的天气下面的风精力光谱和骚乱光谱调节。快Fourier变换(快速傅里叶变换)被用来基于风介绍在高高度(15km)计算风精力和骚乱光谱密度雷达(WPR)大小。在在高高度的稳定的天气条件下面的骚乱光谱在2的一个频率范围以内在力量被表示吗？？

简介：Baiyuneboite-(Ce)isanewfluor-carbonatemineral.Basedonthefinedataonthestructureofthemineral,thefactorgroupandnormalcoordinateanalysesforitsinfraredspectrumhavebeencarriedout.ThefactorgroupanalysesindicatethatthesitegroupandfactorgroupsplittingsoftheinternalvibrationbandsofCO3^2-ionsdonotoccurandthatthedoublebandsofnormalmodesresultfromtwonon-equalsetsofCO3^2-ionsinthecrystalstructure,Thenormalcoordinateanalysesgivethestretchingforceconstants.bendforceconstantsandcalculatedfrequenciesofCO3^2-ions.Thecalculationsofpotentialenergydistributionallowustoassignv3andv4tothestretchingvibrationandthebendvibrationofCO3^2-ions.respectively.

简介：UsingthemethodofSingularSpectrumAnalysis(SSA),theevolutionregularityoftropicalcycloneslandinginGuangdongareanalyzed.ThemainperiodsofyearlytopicalcycloneslandinginGuangdongarefoundat8andquasi-3years,andinthewestofPearlRiverMouthare12andquasi-2yearstothewestofPearlRiverMouth.ThenorthwestPacificthattopicalcyclonesaregeneratedisdividedinto8areas,andtheSea-SurfaceTemperature(SST)ineachareaisanalyzedusingSSA.ThemainperiodsofNINO-westare8and3years,andthoseofthewarmpoolare12and2years,respectively.ThismaybethephysicalreasonforthegenerationtropicalcycloneslandinginGuangdong.BycombiningtheMaximumEntropyMethod(MEM)withSSA(SSA-MEM),theyearlyvariationtrendoftropicalcycloneslandinginGuangdongandthePearlRiverMouthareforecast,andtheresultsaregood.Themethodcanbeusedinoperationalshort-rangeclimateforecast.

简介：Inthispaper,westudytherelationbetweentheenergyspectrumexponentofturbulenceandfractaldimension,andgivetwoempiricalformulas.

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

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。

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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：Standingwavesareformedduetothereflectionwhenwavesmeetverticalwall,thereforestrongstructuresareneededtokeepthewallstabilityundertheseriouswaveattack.Fortheimprovementoftheworkingconditionandincreaseofthestabilityofthewall,thelowerreflectingbreakwatershaveat-tractedcloseattentionReportsmostlyfromJapaneseresearchersareoftenconcernedwiththewallofcaissonequippedwithopenwindows.Inthispaperakindofhollow-pipeperforatedbreakwaterisexam-inedwhichwavesmaypartiallyperforateintotheharbourbasin.Thewaveinfrontofthewallcanonlyformpartialstandingwaveandwaveforceisreducedobviously.Andthetheoreticalcalculationofwaveforceandanalysisofwaveforcespectrumareallderived.Comparisonbetweentheresultsfromtheoreticalcalculationandhydraulicmodelingshowsreasonableagreement.

简介：WestatisticallyanalyzethetropicaltyphoonformingintheSouthChinaSeaanduseTC(TropicalCyclone)forshortinthefollowing)bytyphoonyearbook.Thetyphoonquantityisverydifferentindifferentmonthsandyears.TCappearsinallmonthsexceptMarch,andthemostTCquantityinayearis11,theleastis1and6.2onaverage.ThemostTCquantityinamonthis5andtheleastis0.TClandsmostinAugustandnoTClandsonChinesecontinentfromDecembertothefollowingApril.TheprimarylandingareaisbetweenShantouandHainanIsland.ThesustainingperiodofTCisusuallybetween4daysto7days,andthelongestis19days.Only15%oftheTCformingintheSouthChinaSeacanintensifytotyphoon,andtheyallformintheoceanareadeeperthan150m.TheSouthChinaSeaistheoceanareaoverwhichtheTCoccursfrequently.

简介：Withtheaimtothequantificationofanomalyidentificationandextractionforobservedoranalyzedrecords,wepresenttwostatisticalmethodsofearthquakecorrespondingrelevancyspectrum(ECRS)andslidingmeanrelevancy(SMR).WithECRSmethod,wecanobtaintheabnormalconfidenceattributeofdataindifferentvalueranges.Basedontherelevancyspectrumindifferentstudiedtime-intervals,weconverttheoriginaltimesequenceintorelevancytimesequence,andcanobtaintheSMRtimeseriesbyusingthemulti-pointcumulativeslidingmeanmethod.Thenwecanidentifytheseismicprecursoranomaly.Wetestthismethodbytakingthetimesequenceofη-valueinthenorthernTianshanregionasoriginaldata.Theresultshowsthatwhenthestudiedtime-intervalis18months,theprecursoranomalycanbeidentifiedbetterfromslidingmeanrelevancy.Theanomalycorrespondingrateis83percent,theearthquakecorrespondingrateis86percent,andtheanomalyischaracteristicofthemiddleterm.Totrytheresearchonmulti-parametercomprehensiveapplication,wetaketheKalpintectonicblockinXinjiangasourstudiedregion,andanalyzethespatialandtemporalabnormalcharactersofmulti-parameterslidingextreme-valuerelevancy(MSER)beforemid-strongearthquakesintheKalpinblock.TheresultindicatesthatECRSandSMRsequenceindifferenttime-intervalscannotonlybeusedtoidentifytheprecursoranomalyofsingle-itemdata,butalsoofferthedataofquantitativesingle-itemanomalyforcomprehensiveearthquakeanalysisandprediction.

简介：Thespectrumvariancem0,peakfrequencyω0andpeaknessfactorpareexpressedintermsofnondimensionalfetchanddurationbymakinguseofrelationswhicharederivedthroughcomparingandanalyzingexistingempiricalformulasforthegrowthofsignificantwaveheightandperiod.ThemainfeaturesofspectrumgrowthasspecifiedbytheseparametersagreewiththoseoftheJONS-WAPexperiments.Forgivenwindspeedandfetch,thehighfrequencypartsbeyondthepeaksofshallowwaterspectraalmostcoincidewiththatofthecorrespondingdeepwaterspectrum,whereasthelowfrequencypartsdifferappreciably.ThemethoddevelopedinthispaperpredictssmallersignificantwaveheightaswellassmallerwaveperiodforshallowwaterspectraincontrasttothetheoreticalresultofKitaigorodskiiefal,inwhichthepeakfrequency,andconsequentlythesignificantwaveperiod,remainsbasicallyunchangedfordifferentwaterdepths.Spectraarefurtherreducedtoaforminwhichonlysignificantwaveh

简介：-Amild-slopeequationforcombinedrefractionanddiffractionofrandomwavesintheindependenttimecurrentisderivedusingKirbyequation(1984).Inthederivation,thefrequencyofrandomwavesisrepresentedbasedonthetimeseriesconcept,byatypicalfrequencyanditsdeviationpart.Numericalresults,comparedwiththoseoflaboratoryexperiments,demonstratethatnewsetofirregularmildslopeequationwithcurrentisofgoodadaptability.

简介：Characteristicperiodisanimportantparameteroftheseismicdesignresponsespectrum.Thereisimportanttheoreticalsignificanceandengineeringapplicationvaluetothestudyofthecharacteristicperiodofseismicdesignresponsespectrumofultrahighvoltage(UHV)electricalequipment.Inthispaper,1448horizontalearthquakerecordswithintheworldscopeincludingtheUnitedStatesandJapanforSiteClassⅢwereanalyzed.Resultsshowthatbothmagnitudeandepicentraldistancehavegreatinfluenceonthecharacteristicperiod.About80%ofcharacteristicperiodsofstrongearthquakerecordsareabout0.9s.Statisticalanalysiswasconductedontheseismichazardassessmentresultsof312projectsofChinainrecentyears,anditisfoundthatabout70%ofcharacteristicperiodsareabout0.9s.Combinedwiththerelatedcodecomparisonandanalysis,itissuggestedthatthecharacteristicperiodoftheseismicdesignresponsespectrumofUHVelectricalequipmentshouldselect0.9sinordertoeffectivelyguaranteetheseismicsafetyofUHVelectricalequipment.

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