简介:Whenyoumentionlexicology,absolutelyitisabranchoflinguistics,inquiringintotheoriginsandmeaningsofwords.ThelexicologistMcCarthy(1990)havegivenushisopinionaboutit.Hesaid,grammarisimportant,anditindeedplaysavitalroleinEnglishstudy,butthatisnotall.Infact,tarfromthis.Fromthiswecansee,vocabularyandthestudyandlearningofvocabularytakeanoutstandingplaceinthestudyoflanguage,itwillimprovehisskillsofusingreferencebooksandraisehisproblem-solvingabilityandefficiencyofindividualstudy.Anditwillmakeyoumuchmorereceptiveandproductiveinlanguageprocessingandlan-guageproduction.KnowledgeofEnglishLexicologycanofferagreathelptotheworkoftheteachersofEnglish.Armedwiththisknowledge,theycanbettercontroltheteachingmaterials,especiallytheconcerningwords.Theycanalsoselectandorganizemate-rialstoteachinamoreeffectiveway.Whatismore,theycanmakeuseofthedifferentsenserelationstogroupvocabulary,inter-pretwordsandexplainmeaningstothestudents;Atlast,theirteachingwillprovebetteriftheyhavetheknowledgeofdictionaries.Inmythesis,Iwilltalkabouthowtodealwithnewwordsinmaterial.
简介:Duringthelastfewdecades,photothermalradiometry(PTR)hasbeengreatlydevelopedandwidelyappliedinthefieldofnondestructivetesting.However,thetraditionalPTRsystememploysanexpensivelock-inamplifiertodetecttheweakphotothermalsignal,whichleadstohighcostandlongtesttime.Inthispaper,afasttransmissionPTRsystembasedonsamplingbyusinganinternalcomputersoundcardwasdevelopedtolowerthesystemcostandshorterthetesttime.Apieceofamorphoussilicon(a:Si)thinfilmsolarcellswithartificialdefectswaspreparedandtestedbythesystem.Theresultsshowthatthesharpeneddefectscanbeidentifiedeasilyandquicklyaccordingtothesignificantpeaksoftheoriginalinfraredsignalsampledbytheinternalcomputersoundcard.Furthermore,moredetaileddefectscanbeinvestigatedbyprocessingtheinfraredsignal.ThesevalidatetheeffectivenessoftheproposedtransmissionPTRsystemasalowcostandefficientnon-destructivetesttechnique.
简介:Thispapermakesthethermodynamicanalysisinforcedconvectiveflowofathirdgradefluidthroughaverticalchannel.Duetothereactivenatureofthefluid,theeffectofinternalheatgenerationisconsideredandassumedtobealinearfunctionoftemperature.ThecouplednonlineardimensionlessordinarydifferentialequationsgoverningthefluidflowaresolvedbyusingtheAdomiandecompositionmethod(ADM).Theeffectsofvariousphysicalparameterssuchasthirdgradematerialparameter,buoyancyparameterandheatgenerationparameteronthethermalstructureofflowarepresentedanddiscussed.
简介:Alinear4-nodequadrilateralquasi-conformingplaneelementwithinternalparametersisproposed.Theelementpreservesadvantagesofthequasi-conformingtechnique,includinganexplicitstiffnessmatrix,whichcanbeappliedtononlinearproblems.Theweakpatchtestguaranteestheconvergenceoftheelement.ThenthelinearelementisextendedtothegeometricallynonlinearanalysisintheframeworkofTotalLagrangian(TL)formulation.Thenumericaltestsindicatethatthepresentelementisaccurateandinsensitivetomeshdistortion.
简介:InthedischargeofEASTtokamak,itisobservedthat(2,1)neoclassicaltearingmode(NTM)istriggeredbymodecouplingwitha(1,1)internalmode.Usingsingularvaluedecomposition(SVD)methodforsoftX-rayemissionandforelectroncyclotronemission(ECE),thecouplingspatialstructuresandcouplingprocessbetweenthesetwomodesareanalyzedindetail.TheresultsofSVDforECErevealthatthephasedifferencebetweenthesetwomodesequalstozero.Thisisconsistentwiththeperfectcouplingcondition.Finally,performingstatisticalanalysisofγ1/1,ζ1/1andω2/1,wefindthatγ1/1moreaccuratelyrepresentsthecouplingstrengththanζ1/1,andγ1/1isalsostronglyrelatedtothe(2,1)NTMtriggering,whereγ1/1isthewidthof(1,1)internalmode,ζ1/1istheperturbedamplitudeof(1,1)internalmode,andω2/1denotesthemagneticislandwidthof(2,1)NTM.