简介:Twodifferentmethodsforincorporatingdiffractioneffectintowaveactionbalanceequationbasedcoastalspectralwavemodels,WABEDandSWAN,arediscussedandevaluatedwithrespecttotheirformulations,numericalimplementations,andmodelingcapabilities.Bothmodelswereruntosimulatethewavetransformationthroughagapbetweentwoinfinitelylongbreakwatersandthatacrossanellipticalshoalobservedinlaboratorystudies,withtheemphasislaidonthediffractioninducedbyeitherobstaclesorwaveamplitudevariations.CalculationsofWABEDwerecomparedwithSommerfeld'sanalyticalsolutions,experimentalobservationsandSWANsimulations.Itisshownthatbothmethodscanpredictreasonablywavediffractionforthetwocasesstudiedherein,andafairlybetterperformanceisprovidedbyWABEDforstrongerdiffractioncase.
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.
简介:AlthoughHamilton'squaternionhasbeenintroducedsuccessfullyinestimatingfrequenciesoftwodimensionalharmonics,itwasdifficulttouseittoestimatefrequenciesoftwodimensionalharmonicsinadditivenoisebecausethemultiplicativerulesofHamilton'squaternionwerenotcommutative.Inthispaper,wepresentedanewideatosolvethisproblemandappliedittoarraysignalprocessing.First,wepresentedanotherdefinitionofoperationrulesofquaternion,whosemultiplicativeruleswerecommutative.Second,weappliedthisdefinitiontoconstructcorrelationmatrixofhypercomplexsignalmodelbasedonquaternionsoastorestrainadditivenoise.Finally,wegottheisomorphiccomplexmatrixofcorrelationmatrixofhypercomplexsignalmodeltoestimatefrequencies.Somesimulationsillustratedournewidea.
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.
简介:ThegeomagneticdatarecordedbyKashiandJinghaiobservatoriesinChinawereanalyzedwithimprovedpolarizationmethod.Wecomparedtheresultaround0.01HzwhichisthoughttobeusefultodetecttheULFanomalywiththeresultaround0.1Hzwhichwasinferredfromtheearthquakedepthaccordingtotheskineffect,andfoundthat0.1HzismorepropertodetecttheULFanomalyforbothearthquakesstudiedinthispaper.
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.
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简介:<正>TheFifthComputerFestivalonZhujiangRoad,XuanwuDistrict,NanjingCityandtheGoldenAutumnFairofTrade&InvestmentheldinSeptemberthisyearattracted200well-knowncompanies,allofwhichareintendingtoinvestinNanjing.Followingtheprincipleof"Givingprominencetopreponderantprojectsmarkedoutbythedistrictaswellasmaintainingwholesomeplanningofthecity",XuanwuDistrictputforward28itemsatthefair,coveringthe
简介:Mathematicalmodelsforpulsedfluidizationaresystematicallydiscussed.SeveralundeterminedconstitutiverelationshipsareincludedintheGeneralTwo-FluidModel(GTFM),theadjustableparametersofwhicharealwayschosenatwilltosomeextent.AlthoughtherearenoadjustableparametersintheBasicTwo-FluidModel(BTFM),itseigenvaluesarecomplexnumbersanditisill-posedforinitial-valueproblems.TheLocalEquilibriumModel(LEM),afurthersimplificationofBTFM,isdiscussedatlength.Althoughthemodelisverysimple,itishighlycapableofsimulatingcomplexprocessesinpulsedfluidizationoverabroadrangeofoperatingparameters,anditsnumericalresultswellfitexperimentalresultsinboththevariationofbedheightandthedistributionofparticleconcentrationasfluidizingvelocityvaries.
简介:Inthispaper,accordingtotheFujianSeismicNetworkearthquakecatalogrecords,theTnowmethodandtheFourStationsContinuousLocationmethod(hereinaftercalledFSCL)putforwardbyJinXingareinspectedbyusingP-wavearrivalinformationofthefirstfourstationsofeachseismicevent.Resultsshowthatforearthquakeswithinthenetwork,bothmethodscanobtainsimilarlocationresultsandlocationdeviationsaresmallforthemajorityoftheevents.Forearthquakesoutsidethenetwork,thelocationdeviationmaybeamplifiedastheepicentraldistanceincreases,owingtotheseismicstationdistributionwhichspreadtowardthesideoftheepicenterandthesmallopeninganglebetweenseismicstationsusedforlocatingandepicenter.FortheFSCLmethod,theimpactsofthewavevelocityonthelocationresultsmaybesignificantforearthquakesoutsidethenetwork.Thus,selectingavelocitymodelwhichissimilartotheactualstructureofthewavevelocitywillcontributetoimprovinglocationresultsofearthquakes.TheFSCLmethodcanlocatemoreseismiceventsthantheTnowmethod.ItconcludesthattheTnowmethodmakesuseofmistakeinformationfromsomenon-triggeringstationsinearthquakecatalog,andsomeP-wavearrivalsarenotincludedintheearthquakecatalogduetodiscontinuousrecordsorunclearrecordsoftheseismicphase,whichinducesincorrectlocation.
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。