简介：这篇论文澄清单个价值分解分析(SVD)的显著性检验的本质，并且为测试SVD的联合模式的意义调查四条规则，包括平行分析，非参量自举，随机阶段的测试，和说出的一条新规则修改了平行分析。一个数字实验被进行到份量上在判定SVD的acoupled模式是否作为象样品尺寸，格子点的数字，和signal-to-noise比率那样的参数重要比较四条规则的表演变化。四条规则与格子点的数字的更低的比率更好执行到的结果表演取样尺寸。修改平行分析并且非参量自举最好表现放弃假联合模式，而是后者当样品尺寸不比格子点的数字大得多时，比前者好保留重要联合模式。仅仅当(1)在格子点的观察是时，平行分析和随机阶段的测试是柔韧的放弃假联合模式空间地uncorrelated，或(2)联合信号为平行分析是很强壮的并且不为随机阶段的测试是弱的。影响测试规则的精确性的原因被讨论。

简介：这份报纸建议我们叫作鈥渟egregated预言鈥?预言是nonstationary的气候时间系列的一条新途径。这条途径基于实验模式分解方法(EMD)，它能分解一时间信号进基本摆动的部件的一个有限、通常小的数字。到这的能力接近的测试，一些预言实验为几个气候时间系列被执行。试验性的结果证明这条途径能分解气候时间系列的nonstationarity并且分离在不同模式部件之间的非线性的相互作用，它从而能改进这些原来的气候时间系列的预言精确性。关键词EMD-nonstationarity-非线性的系统-气候预言-时间系列预言

简介：Ahigher-orderboundaryelementmethod(HOBEM)forsimulatingthefullynonlinearregularwavepropagationanddiffractionaroundafixedverticalcircularcylinderisinvestigated.Thedomaindecompositionmethodwithcontinuityconditionsenforcedontheinterfacesbetweentheadjacentsub-domainsisimplementedforreducingthecomputationalcost.Byadjustingthealgorithmofiterativeprocedureontheinterfaces,fourtypesofcouplingstrategiesareestablished,thatis,Dirchlet/Dirchlet-Neumman/Neumman(D/D-N/N),Dirchlet-Neumman(D-N),Neumman-Dirchlet(N-D)andMixedDirchlet-Neumman/Neumman-Dirchlet(MixedD-N/N-D).Numericalsimulationsindicatethatthedomaindecompositionmethodscanprovideaccurateresultscomparedwiththatofthesingledomainmethod.Accordingtothecomparisonsofcomputationalefficiency,theD/D-N/Ncouplingstrategyisrecommendedforthewavepropagationproblem.Asforthewave-bodyinteractionproblem,theMixedD-N/N-Dcouplingstrategycanobtainthehighestcomputationalefficiency.

简介：Studyonformcharacteristicsofnitrogeninmarinesedimentsistheprimarymethodtoresearchitsbiogeochemicalcyclingandnitrogenformcharacteristicsincoresedimentscanreflecttheprocessandresultsofearlydiagenesisinacertaindegree.Inthispaper,SequentialextractionprocessinnaturalgrainsizewasusedforstudyingtheexistentformsofnitrogeninfivecoresedimentsofthesouthernBohaiSeaforthefirsttime.Nitrogenwasdividedintotwoparts-transferableandfixedbasedonwhetheritcouldbeextractedbythereagent.DistributionsandearlydiagenesisoftransferablenitrogenformsinthesouthernBohaiSeawereresearchedintegratedly.ResultsindicatethatIEF-NandOSFNarepredominantformsintransferablepartinthestudiedcoresediments.Contentsofdifferentnitrogenformsvarydifferentlywithdepth,andhavedifferentdiagenesisprocess.Decompositionconstantoforganicnitrogen(ON)andOCareabout15.51×10-3a-1and4.79×10-3a-1respectively,andthedecompositioncontentofbiogenicelementsC,N,P,SihasthesequenceN＞P＞C＞Si.OC/TN(simplifiedasC/Ninthefollowing)ratioismuchlowerthanOC/ON,whichindicatesthatsedimentpreservesplentyofinorganicnitrogen(IN)and/orfixednitrogen,andthedecreaseofOC/ONratiowithdepthisduetoONreservationinsediments.Generally,transferablenitrogenaccountsformoreproportionofTNinthesurfacelayerthaninthedeeplayerofcoresediments,whereas,somestableformsofnitrogencanactivateandbecometransferableunderappropriateenvironment,whichinducestheproportionoftransferablenitrogeninTNinthedeeplayertobealmostthesameasthatinthesurfacelayer.

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简介：多不的芳香的烃的命运(哼)居住在空气在最近的年里收到了庞大的注意由于他们的诱变并且人的健康上的carcinogenicrisks。在这上下文，分核的稳定性(当一个代表哼)在石英，氧化铝，胶岭石，高岭石，腐殖酸和与sorbed涂的石英上，腐殖酸在控制相对湿度被调查(RH：即5%和30%)没有轻照耀以便在PAHsdecomposition上检测矿物质表面的催化效果的存在。分核的稳定性被发现强烈取决于底层的物理化学性质。尽管它与sorbed腐殖酸是涂的，石英为分核的分解显示出强壮的催化效果。蒙脱石和腐殖酸上的分核sorbed在试验性的时期期间仍然保持稳定(即3天)。在试验性的房间的潮湿也特别地影响了分核的稳定性矿物质。特别，氧化铝上的分核sorbed很快在更高的RH被分解。然而，有几乎不在石英，高岭石和腐殖酸的情况中完成。取决于喷雾器和RH的物理化学性质，有在空气的矿物质的PAHsassociated将被分解或稳定地居住在空气。

简介：Accurateestimationofstiffnesslossisachallengingprobleminstructuralhealthmonitoring.Inthisstudyorthogonalwaveletdecompositionisusedforidentifyingthestiffnesslossinasingledegreeoffreedomspring-mass-dampersystem.Theeffectsofexcitationfrequencyonaccuracyofdamagedetectionisinvestigated.Resultsshowthatpseudo-aliaseffectscausedbytheorthogonalwaveletdecomposition(OWD),affectdamagedetectability.Itisdemonstratedthattheproposedapproachissuitablefordamagedetectionwhentheexcitationfrequencyisrelativelylow.Thisstudyshowshowaprioriknowledgeaboutthesignalandabilitytocontrolthesamplingfrequencycanenhancedamagedetectability.

简介：光谱表示方法(SRM)广泛地被用来模仿空间地变化的地面运动。这研究基于根分解集中于SRM的近似途径，它能改进模拟的效率。近似途径的精确性可以被三个因素影响：为分解的矩阵，为插值的频率插值节点和元素的分发。这条途径的精确性上的这些因素的影响被检验，下列结论被得出。SRM基于十字的根分解比SRM基于落后连贯矩阵的根分解展出更大的精确性光谱矩阵。节点在这研究建议了的频率插值的相等的精力分发是比有相等的间距的相反的木髓更有效的。为插值的元素没在精确性上有许多效果，因此因为它从一个计算效率观点是不太复杂的，分解矩阵的元素的插值被推荐。

简介：在时间域的领域分解和匹配的方法为模仿在波浪进展的轮船的运动被构画出。流动域被想象的控制表面分解成内部、外部的域，并且当短暂格林函数方法在外部域被使用时，Rankine来源方法被用于内部域。二个起始的边界价值问题在控制表面上被匹配。相应数字代码被开发，并且为系列60轮船和S175货柜船在头海进展的增加的群众，波浪激动力量和轮船运动，被介绍并且验证。当数字结果与试验性的数据和另外的引用相比时，一个好协议被获得了。它证明因为面板discretization，现在的方法在数字计算期间在内部领域仅仅是更有效的，并且好数字稳定性被证明与闪光关于轮船避免分叉问题。

简介：Environmentalloadistheprimaryfactorinthedesignofoffshoreengineeringstructuresandoceancurrentistheprincipalenvironmentalloadthatcausesunderwaterstructuralfailure.Incomputationalanalysis,thecalculationofcurrentloadismainlybasedonthecurrentprofile.Thecurrentprofilemodel,whichisbasedonastructuralfailurecriterion,isconducivetodecreasingtheuncertaintyofthecurrentload.Inthisstudy,weusedprototypemonitoringdataandtheempiricalorthogonalfunction(EOF)methodtoinvestigatethecurrentprofileintheSouthChinaSeaanditscorrelationwiththedesignofunderwaterstructuralstrengthandthedynamicdesignoffatigue.Theunderwaterstructuralstrengthdesigntakesintoaccountthesizeofthestructureandtheservicewaterdepth.Weproposeprofilesfortheoverallandlocaldesignsusingtheinversefirst-orderreliabilitymethod(IFORM).Weextractedthecharacteristicprofilecurrent(CPC)ofthemonitoredseaareatosolvedynamicdesignproblemssuchasvortex-inducedvibration(VIV).WeusedrandomsamplingtoverifythefeasibilityofusingtheEOFmethodtocalculatetheCPCfromthecurrentdataandidentifiedthemainproblemsassociatedwithusingtheCPC,whichdeservecloseattentioninVIVdesign.Ourresearchconclusionsprovidedirectreferencesfordeterminingcurrentloadinthisseaarea.Thisanalysismethodcanalsobeusedintheanalysisofotherseaareasorfieldvariables.

简介：Inthepastfewyears,three-dimensional(3-D)seismogramhasbecomeanessentialtoolfortheinterpretationofsubsurfacestratigraphyanddepositionalsystems.Seismicstratigraphyinconjunctionwithseismicgeomorphologyhaselevatedthedegreetowhichseismicdatacanfacilitategeologicalinterpretation,especiallyinadeepwaterenvironment.Technologiessuchastimeslicingandintervalattributeanalysiscanenhancegeomorphologicalinterpretations,and,whenintegratedwithstratigraphicanalyses,canyieldinsightsregardingdistributionofsealandreservoirfacies.Multipleattributescorenderingcanfurtherbringoutfeaturesofgeologicalinterestthatothertechnologiesmayoverlook.Thismethodinvolvescorenderspectraldecompositioncomponents(SDC)withsemblanceattributestodescribethedistributionofdeepwaterchannelelementsandtheboundariesofdeepwatersinuouschannel.Applyingthistechnologytofourelementsisobserved:(1)point-bars,(2)migrationofchannelmeanderloops,(3)channelerosion/cut,and(4)avulsion.Theplanviewexpressionofthedeepwaterchannelrangesfromlowsinuositytohighsinuosity.Furthermore,thistechnologyhasenabledinterpreterstovisualizedetailsofcomplexdepositionalelementsandcanbeusedtopredictnet-to-grossratioinchannelsystems,whichcanbeincorporatedintoboreholeplanningforexplorationaswellasdevelopmentneedstoimproveriskmanagementsignificantly.Thetechnologyisappliedtothestudyareainanefforttoillustratethevarietyofinterpretationtechnologiesavailabletothegeoscientist.