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500 个结果
  • 简介:Twodifferentmethodsforincorporatingdiffractioneffectintowaveactionbalanceequationbasedcoastalspectralwavemodels,WABEDandSWAN,arediscussedandevaluatedwithrespecttotheirformulations,numericalimplementations,andmodelingcapabilities.Bothmodelswereruntosimulatethewavetransformationthroughagapbetweentwoinfinitelylongbreakwatersandthatacrossanellipticalshoalobservedinlaboratorystudies,withtheemphasislaidonthediffractioninducedbyeitherobstaclesorwaveamplitudevariations.CalculationsofWABEDwerecomparedwithSommerfeld'sanalyticalsolutions,experimentalobservationsandSWANsimulations.Itisshownthatbothmethodscanpredictreasonablywavediffractionforthetwocasesstudiedherein,andafairlybetterperformanceisprovidedbyWABEDforstrongerdiffractioncase.

  • 标签: 衍射效应 可预测性 模型 评价 平均 模拟实验
  • 简介:一个新二水平的subspace方法为从无限维的优化问题解决一般非强迫的最小化明确的表达discretized被建议。在每次重复,算法也在当前的水平或粗糙的subspace修正步上执行直接的步。在粗糙的subspace修正步,我们由并列方向和坡度方向在当前的点跨越的二维的subspace扩充传统的粗糙的格子空间。全球集中被证明,集中率在discretized功能上在一些温和条件下面被学习。一些变化问题的初步的数字实验证明我们的二水平的subspace方法是有希望的。

  • 标签: 优化 非线性 温和条件 数字实验 最小化 无限维
  • 简介:在隧道流动由二层组成由底部波动散布飞机表面波浪被假设隧道的床由多孔的材料组成调查。液体的上面的表面被一个僵硬的盖围住,隧道在水平方向是无界的。在那里存在相应于一个内部波浪的一个仅仅波浪模式。为小波动,简化不安分析被用来首先以包含描述底部的形状功能的积分获得顺序思考和传播系数。为正弦曲线底部波动和指数地腐烂的底部地形学,第一命令系数被计算。在正弦曲线底部的情况中,第一个顺序传播系数被发现相等消失。数字结果在很多个数字图形地被描绘。

  • 标签: 多孔材料 底部 起伏 散射 通道 透射系数
  • 简介:ThePangolin,asoil-burrowinganimal,iscoveredwithscales.Thesescalesareoftenabradedbysoilandrockandtheirsurfaceiscorrugated.Theabrasivewearofthesurfaceofthescaleswasexamined.Thescalesweretakenfromapangolinthathaddiedofnaturalcauses.Thetestswererunonarotarydiscabrasiveweartester.Theabrasivematerialwasquartzsand(96.5wt.%)andbentonite(3.5wt.%).Themorphologyoftheabradedsurfacesandtheabrasionwereexaminedbystereoscopicmicroscopyandscanningelectronmicroscopy.Theconceptsareproposedof'Guiding-Effect'and'Rolling-Effect'onthetexturedsurfacesunderfreeabrasivewearconditionsandthecriticaldimensionsofthe'Rolling-Effect'arediscussed.

  • 标签: 仿生学 穿山甲 形态学 表面磨损
  • 简介:AlthoughHamilton'squaternionhasbeenintroducedsuccessfullyinestimatingfrequenciesoftwodimensionalharmonics,itwasdifficulttouseittoestimatefrequenciesoftwodimensionalharmonicsinadditivenoisebecausethemultiplicativerulesofHamilton'squaternionwerenotcommutative.Inthispaper,wepresentedanewideatosolvethisproblemandappliedittoarraysignalprocessing.First,wepresentedanotherdefinitionofoperationrulesofquaternion,whosemultiplicativeruleswerecommutative.Second,weappliedthisdefinitiontoconstructcorrelationmatrixofhypercomplexsignalmodelbasedonquaternionsoastorestrainadditivenoise.Finally,wegottheisomorphiccomplexmatrixofcorrelationmatrixofhypercomplexsignalmodeltoestimatefrequencies.Somesimulationsillustratedournewidea.

  • 标签: 频率估计 和声学 数列信号 噪音抑制
  • 简介:二新benzofuranlignanglycosides,gelsemiunosideA和B,从GelsemiumelegansBenth的整个植物被孤立。他们的结构根据分光镜的证据被阐明。而且,gelsemiunosideA和B被看一个有势力由压制A375-S2房间的增长的细胞毒素的活动。

  • 标签: 素馨属 苯并呋喃 木酚素 糖苷 植物化学
  • 简介:Forthestabilityrequirementofnumericalresultants,themathematicaltheoryofclassicalmixedmethodsarerelativelycomplex.However,generalizedmixedmethodsareautomaticallystable,andtheirbuildingprocessissimpleandstraightforward.Inthispaper,basedontheseminalideaofthegeneralizedmixedmethods,asimple,stable,andhighlyaccurate8-nodenoncompatiblesymplecticelement(NCSE8)wasdevelopedbythecombinationofthemodifiedHellinger-Reissnermixedvariationalprincipleandtheminimumenergyprinciple.Toensuretheaccuracyofin-planestressresults,asimultaneousequationapproachwasalsosuggested.NumericalexperimentationshowsthattheaccuracyofstressresultsofNCSE8arenearlythesameasthatofdisplacementmethods,andtheyareingoodagreementwiththeexactsolutionswhenthemeshisrelativelyfine.NCSE8hasadvantagesoftheclearingconcept,easycalculationbyafiniteelementcomputerprogram,higheraccuracyandwideapplicabilityforvariouslinearelasticitycompressibleandnearlyincompressiblematerialproblems.ItispossiblethatNCSE8becomesevenmoreadvantageousforthefractureproblemsduetoitsbetteraccuracyofstresses.

  • 标签: Modified H-R MIXED variational principle Partial-mixed
  • 简介:ThegeomagneticdatarecordedbyKashiandJinghaiobservatoriesinChinawereanalyzedwithimprovedpolarizationmethod.Wecomparedtheresultaround0.01HzwhichisthoughttobeusefultodetecttheULFanomalywiththeresultaround0.1Hzwhichwasinferredfromtheearthquakedepthaccordingtotheskineffect,andfoundthat0.1HzismorepropertodetecttheULFanomalyforbothearthquakesstudiedinthispaper.

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  • 简介:Objective:ToestablisharapidandsimpleassayforthediagnosisofChlamydiatrachomatis(CT)infection.MethodsBALB/cmicewereimmunizedwithSDS-PAGEpurifiedmajoroutermembraneprotein(MOMP)fromCTandthemonoclonalantibodieswereobtainedsubsequently.Two-siteELISAwasdevelopedtodetectCTinfection.Results:Theestablishedassaywasabletodetectaslowas1.248ug/mlMOMPwithinterrunandinrunCV6.9%and3.1%respectively.94%(34/36)ofculture-positivesampleswerefoundtobepositiveinthecurrentexamination,indicatingthehighsensitivityofthisassay.Conclusion:TheassayisapplicableforclinicaldiagnosisofCTinfection.

  • 标签: 沙眼衣原体感染 CT 外膜蛋白 MOMP 单克隆抗体 动物实验
  • 简介:<正>TheFifthComputerFestivalonZhujiangRoad,XuanwuDistrict,NanjingCityandtheGoldenAutumnFairofTrade&InvestmentheldinSeptemberthisyearattracted200well-knowncompanies,allofwhichareintendingtoinvestinNanjing.Followingtheprincipleof"Givingprominencetopreponderantprojectsmarkedoutbythedistrictaswellasmaintainingwholesomeplanningofthecity",XuanwuDistrictputforward28itemsatthefair,coveringthe

  • 标签: DISTRICT Nanjing covering GOLDEN COMPANIES maintaining
  • 简介:Mathematicalmodelsforpulsedfluidizationaresystematicallydiscussed.SeveralundeterminedconstitutiverelationshipsareincludedintheGeneralTwo-FluidModel(GTFM),theadjustableparametersofwhicharealwayschosenatwilltosomeextent.AlthoughtherearenoadjustableparametersintheBasicTwo-FluidModel(BTFM),itseigenvaluesarecomplexnumbersanditisill-posedforinitial-valueproblems.TheLocalEquilibriumModel(LEM),afurthersimplificationofBTFM,isdiscussedatlength.Althoughthemodelisverysimple,itishighlycapableofsimulatingcomplexprocessesinpulsedfluidizationoverabroadrangeofoperatingparameters,anditsnumericalresultswellfitexperimentalresultsinboththevariationofbedheightandthedistributionofparticleconcentrationasfluidizingvelocityvaries.

  • 标签: 两相流 流体模型 脉冲流化 数值模拟 局部平衡模型 流体力学
  • 简介:Inthispaper,accordingtotheFujianSeismicNetworkearthquakecatalogrecords,theTnowmethodandtheFourStationsContinuousLocationmethod(hereinaftercalledFSCL)putforwardbyJinXingareinspectedbyusingP-wavearrivalinformationofthefirstfourstationsofeachseismicevent.Resultsshowthatforearthquakeswithinthenetwork,bothmethodscanobtainsimilarlocationresultsandlocationdeviationsaresmallforthemajorityoftheevents.Forearthquakesoutsidethenetwork,thelocationdeviationmaybeamplifiedastheepicentraldistanceincreases,owingtotheseismicstationdistributionwhichspreadtowardthesideoftheepicenterandthesmallopeninganglebetweenseismicstationsusedforlocatingandepicenter.FortheFSCLmethod,theimpactsofthewavevelocityonthelocationresultsmaybesignificantforearthquakesoutsidethenetwork.Thus,selectingavelocitymodelwhichissimilartotheactualstructureofthewavevelocitywillcontributetoimprovinglocationresultsofearthquakes.TheFSCLmethodcanlocatemoreseismiceventsthantheTnowmethod.ItconcludesthattheTnowmethodmakesuseofmistakeinformationfromsomenon-triggeringstationsinearthquakecatalog,andsomeP-wavearrivalsarenotincludedintheearthquakecatalogduetodiscontinuousrecordsorunclearrecordsoftheseismicphase,whichinducesincorrectlocation.

  • 标签: 地震定位方法 地震预警 位置偏差 地震目录 地震事件 错误信息
  • 简介:新对光反应变色bisphenoxynaphthacenequinone混合物,6,6素数-[1-methylethylidenebis(4,1-phenyleneoxy)]二度(5,12-naphthacenequinone)(1),被一个二拍子的圆舞方法综合,即,6的合成[4-(2-(4-hydroxyphenyl)异丙基)含苯氧基)从6-chloro-5的-5,12-naphthacenequinone(2),12-naphthacenequinone(3)和bisphenol--A,和在DMF/丙酮的化合物2的进一步的反应面对无水的碳酸钾和碘化钾混合了溶剂。粗略的产品在一种precipitate形式被获得并且能被再结晶容易净化。溶剂作文在第二步在猛抛的粗略的产品的收益上标记影响。(编辑作者摘要)3个裁判员。

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