简介:Theinvestigationwasperformedon4Mullets(27~49cmlongandweighing225~1500geach)ofbothsexesfromthewatersoffTianjin.Smallpiecesofthegillswereslicedandimmersionfixedinabuffermixtureof1.5%glutaraldehyde,1.5%paraformaldehydeand0.1mol/dm3phosphateforatleast24h.Afterfixationinphosphatebuffered1%O?O4at4℃for1h,thetissueswere
简介:杰克起来,单位广泛地在在全世界钻工程正在起一个成功的作用,并且他们的安全和效率在研究和工程实践拿越来越多的吸引力。spudcan穿入深度的精确预言在决定杰克起来联合起来是否是可行的在这个地点操作是相当有帮助的。太大的穿入深度的预言可以在随后的抽取过程由于潜在的困难导致犹豫或甚至一个地点的拒绝;一样在操作期间由于可能的不稳定性的问题太小的深度预言是真的。然而,在预兆的结果之间的偏差和最后的地数据通常存在,特别当strong-over-soft土壤在阶层被包括时。最终的决定在很大程度上有时取决于实际经验,不是指南给的预兆的结果。它是有点危险的,但是没有选择。因此,特别在有strong-over-soft土壤侧面的阶层,为spudcan穿入深度的一个可行预兆的方法着急地被需要由杰克起来工业。鉴于这,预言spudcan穿入的方法上的全面调查被执行。为不同土壤侧面的类型,为spudcan穿入深度的预兆的方法被建议,并且相应实验也被进行验证这些方法。另外,验证建议方法的可行性推进,在华南海遇到的一个实际工程盒子是也介绍了,并且相应数字、试验性的结果也被介绍并且讨论。
简介:AfterreviewingtheanalyticaltheoriesofT-Scurve,somemethodsofT-Srelationship,andfuzzysetsforstudyingwatermasses,newmethodsoffittingthemembershipfunctionofoceanicwatermassesarepresentedbasedonthecharacteristicsofT-Scurvefamilyofoceanicwatermasses.ThemembershipfunctionsofoceanicSubsurfaceWaterMasswithhighsalinityandIntermediateWaterMasswithlowsalinityarefittedanddiscussedusingthenewmethods.Theproposedmethodsareusefulinanalyzingthemixingandmodifyingprocessesofthesewatermasses,especiallyintracingtheirsources.Theprinciplesandformulaeofthenewmethodsandexamplesaregiven.
简介:Thewaveletpackettransformisusedforthedamagedetectionofoffshoreplatforms.Whensomedamageoccurs,thedynamicresponseparametersofthestructurewillshiftsubtly.However,insomecases,thedynamicparameters,suchasdynamicresponse,arenotsensitive,anditisverydifficulttopredicttheexistenceofdamage.Thepresentpaperaimstodescribehowtofindsmalldamagebytheuseofwaveletpackettransform.Asthewaveletpackettransformcanbeusedtoquicklyfindthesingularityoftheresponsesignalondifferentscales,theaccelerationsignalofadamagedoffshoreplatforminthetimedomainistransformedthroughthewaveletpacket.ExperimentalresultsshowthattheDaubechies4wavelettransformcanbeusedtodetectdamage.
简介:-Measuringmulti-directionalwaveswiththewavegaugearrayisoneofthefundamentalandeasilyrealisedmethods.Inthispaper,thewavegaugearrayisdescribedandtheeffectsofthegaugespacing,thearrayorientations,etc.ofthethreearrayarrangements,i.e.,lineararray,T-typearrayandpentagonarray,ontheresolutionofthedirectionalspreadingofwaves,areinvestigatedexperimentally.Thisstudycanbeusedasareferenceintheexperimentalstudyandthefieldmeasurementofdirectionalwaves.
简介:Satelliteremotesensingofinlandwaterbodyrequiresahighspatialresolutionandamultibandnarrowspectralresolution,whichmakesthefusionbetweenpanchromatic(PAN)andmulti-spectral(MS)imagesparticularlyimportant.TakingtheDaquekousectionoftheQiantangRiverasanobservationtarget,fourconventionalfusionmethodswidelyacceptedinsatelliteimageprocessing,includingpansharpening(PS),principalcomponentanalysis(PCA),Gram-Schmidt(GS),andwaveletfusion(WF),areutilizedtofuseMSandPANimagesofGF-1.TheresultsofsubjectiveandobjectiveevaluationmethodsapplicationindicatethatGSperformsthebest,followedbythePCA,theWFandthePSintheorderofdescending.Theexistenceofalargeareaofthewaterbodyisadominantfactorimpactingthefusionperformance.Meanwhile,theabilityofretainingspatialandspectralinformationsisanimportantfactoraffectingthefusionperformanceofdifferentfusionmethods.ThefundamentaldifferenceofreflectivityinformationacquisitionbetweenwaterandlandisthereasonforthefailureofconventionalfusionmethodsforlandobservationsuchasthePStobeusedinthepresenceofthelargewaterbody.Itissuggestedthattheadoptionoftheconventionalfusionmethodsintheobservingwaterbodyasthemaintargetshouldbetakenwithcaution.Theperformancesofthefusionmethodsneedre-assessmentwhenthelarge-scalewaterbodyispresentintheremotesensingimageorwhentheresearchaimsforthewaterbodyobservation.
简介:Codfishisakindofabyssalfishspecieswithagreatvalueinfoodindustry.However,theflavorofcodfish,especiallytheunpleasantodor,hascausedseriousproblemsinitsprocessing.Toaccuratelyidentifythevolatilecompoundsincodfish,acombinationofsolidphasemicro-extraction(SPME)methodandsimultaneousdistillationextraction(SDE)methodwasusedtoextractthevolatiles.Gaschromatography-massspectrometry(GC-MS)alongwithKovatsindices(KI)andauthenticstandardcompoundswereusedtoidentifythevolatiles.Theresultsshowedthatatotalof86volatilecompoundswereidentifiedincodfish,ofthem24wereextractedbySDE,69compoundsbySPME,and10compoundsbybothSDEandSPME.Seventyvolatilecompoundswerefoundtohavespecificodors,ofthem7typicalcompoundscontributedsignificantlytotheflavorofcodfish.Alcohols(i.e.,(E)-2-penten-1-oland2-octanol),esters(i.e.,ethylbutyrateandmethylgeranate),aldehydes(i.e.,2-dodecenalandpentadecanal)contributedthemosttofreshflavorwhilenitrogencompounds,sulphurcompounds,furans,aswellassomeketones(i.e.,2-hydroxy-3-pentanone)broughtunpleasantodor,suchasfishyandearthyodor.ItwasindicatedthatthecombinationofmultipleextractionmethodsandGC-MSanalysiscanenhancetheaccuracyofidentification,andprovideareferenceforthefurtherstudyonflavorofaquaticproducts.
简介:象多重信号分类和经由旋转不变性技术(精神)的信号参数的评价那样的高分辨率的途径当前在multibeam回响声音(MBES)广泛地被采用为海地板深测术的系统,在一个一致的线数组也被要求的地方。然而,由于要求以系统范围/决定和安装空间限制,一个MBES系统通常与特殊形状采用一个收到的数组,它意味着高分辨率的算法不能直接被使用。另外,当在MBES系统使用高分辨率的算法时,短期的静止回响信号使估计高分辨率的途径要求的协变性矩阵困难,它进一步增加复杂性。有多重角度的subarraybeamforming的精神被采用以signal-to-noise比率,快照的数字,和计算努力减少要求。模拟证明新处理方法能提供更好好结构的分辨率。然后,一个highresolution底部察觉(HRBD)算法被把新处理方法与虚拟数组转变相结合开发。到一个U字形的数组的HRBD算法的应用程序是也讨论。计算机模拟和试验性的数据处理结果验证建议算法的有效性。
简介:Usingstatisticallydownscaledatmosphericforcing,weperformedanumericalinvestigationtoevaluatefutureclimate’simpactonstormsurgesalongtheGulfofMexicoandU.S.eastcoast.Thefocusisontheimpactofclimaticchangesinwindpatternandsurfacepressurewhileneglectingsealevelriseandotherfactors.Weadaptedtheregionaloceanmodelsystem(ROMS)tothestudyregionwithameshgridsizeof7-10kminhorizontaland18verticallayers.Themodelwasvalidatedbyahindcastofthecoastalsealevelsinthewinterof2008.Model’srobustnesswasconfirmedbythegoodagreementbetweenmodel-simulatedandobservedsealevelsat37tidalgages.Two10-yearforecasts,onefortheIPCCPre-Industry(PI)andtheotherfortheA1FIscenario,wereconducted.Thedifferencesinmodel-simulatedsurgeheightsunderthetwoclimatescenarioswereanalyzed.Weidentifiedthreetypesofresponsesinextremesurgeheightstofutureclimate:acleardecreaseinMiddleAtlanticBight,anincreaseinthewesternGulfofMexico,andnon-significantresponsefortheremainingarea.Suchspatialpatternisalsoconsistentwithpreviousprojectionsofseasurfacewindsandoceanwaveheights.
简介:基于相关矩阵特征向量的目标分解将地物回波复杂的散射过程分解成相互独立的三种单一散射分量:单向散射、双向散射和交叉散射,分别对应各自的目标相关矩阵.目标分解技术降低了散射回波之间的相关性,有利于分析地物散射机理,有助于提高分类精度.对荷兰Flevoland地区全极化数据进行分解,经过试验和相关性分析,选用7种数据形成多参数数据组合,对其进行最大似然监督分类,同时进行常规三种极化加相位差的分类和基于复Wishart分布的最大似然分类,逐像元计算混淆矩阵,分析对比三种分类结果的精度,试验表明:相对于常规数据组合分类,基于复Wishart分布的监督分类可以小幅度提高分类精度,而利用目标分解得到多参数组合数据进行分类则有大幅度的提高。