简介:Becauseofitsgoodconditionwithmechanics,logarithmicspiraldoublecurvearchbamhasbeenwidelyusedinthepracticalengineering.Theintroductionofanewmethodinhowtodividetransversejointinarchdamwillbegivenandthefurtherresearchofitscalculationhasbeendone.TheC++isusedinelectronicprocedureandthe3DsimulationhasbeenfinishedwithAutoCAD,whichwillprovidetheobjectmodelforcomputersimulationofthearchdamandthedivisionoffiniteelementmesh.Meanwhile,thismethodindividingthetransversejointinarchdamalsocanbetakenasthecalculatedbasisforthedesignandcalculationofarchdam,constructionloftingandthecalculationoftheworkamount.
简介:Plasmonicgratingstructureshavebeenshowneffectiveatincreasingnear-fieldopticalenhancement.Adoublewidthplasmonicgratingdesignisintroduced,whereeachperiodhastwoalternatingmetalwidthsseparatedbyananogap.Withthisnewdesign,analysishasshownthatplasmonicresonancescouplebetweeneachmetalsection,resultinginevengreateropticalenhancementcomparedwithsingle-widthgratings.Thegeometrythatgivesthegreatestopticalenhancementhasbeendeterminedwithacomputationalmodel.Thisworkdemonstratesthattheincreasedenhancementisduetohybridizedmodesthatcouplebetweenthetwogratingsegments.
简介:TheDonnelltheoryofshellwasappliedtodescribeshellmotion.Theinnerandoutershellswerestiffenedbytransversecomponents.Usingdeformationharmoniousconditionsoftheinterface,theeffectsofstiffenersweretreatedasreverseforcesandmomentsonthedoublecylindricalshell.Intheacousticfieldproducedbyvibrationandsoundradiationofthedoubleshell,thestructuredynamicequation,Helmholtzequationinthefluidfieldandthecontinuityconditionsofthesurfaceoffluid-structurecomposethevibrationequationcoupledbythesound-fluid-structure.Theextractofacousticpressurecomesdowntotheextractofcouplingvibrationequation.Thenearfieldacousticpressurecanbesolveddirectlybycomplicatedcalculationalmethods.
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简介:Activatedcarbons(ACs)withawiderangeofsurfaceareasweremadefrompetroleumcokebymeansofKOHactivation.Theelectrochemicalcharacterizationwascarriedoutforseveralactivatedcarbonsusedaspolarizableelectrodesofelectricdouble-layercapacitors(EDLCs)inanaqueouselectrolyticsolution.Theporousstructuresandelectrochemicaldouble-layercapacitanceoftheactivatedcarbonswereinvestigatedbyvirtueofnitrogengasadsorptionandconstantcurrentcycling(CCC)methods.Therelationshipamongthesurfacearea.porevolumeoftheactivatedcarbonsandspecificdouble-layercapacitancewasdiscussed.ItwasfoundthatthespecificcapacitanceofACsincreasedlinearlywiththeincreaseofsurfacearea.Thepresenceofmesoporesintheactivatedcarbonswithveryhighsurfacearea(>2000m^2/g)wasnotveryeffectiveforthemtobeusedasEDLCs.Theinfluenceofchemicalcharacteristicsoftheactivatedcarbonsonthedoublelayerformationcouldbeconsideredtobenegligible.
简介:AccumulatingevidencehasdemonstratedthatregulatoryT(Treg)cellsplayanimportantroleinthemaintenanceofimmunologicself-toleranceandindown-regulatingvariousimmuneresponses.Thus,therehasrecentlybeenanincreasinginterestinstudyingthebiologyofTregcellsaswellastheirpotentialapplicationintreatingimmunediseases.ManytypesofTregcellsubsetshavebeenreportedinavarietyofdiseasemodels.Amongthesesubsets,αβ-TCR+CD3+CD4-CD8-doublenegative(DN)TregcellsaredefinedbytheircapabilityofinhibitingimmuneresponsesviadirectlykillingeffectorTcellsinanantigenspecificfashion.Furthermore,DNTregcellshavebeenshowntodevelopregulatoryactivityafterencounteringspecificantigens,partiallymediatedbytheacquisitionofMHC-peptidecomplexesfromantigenpresentingcells(APCs).ThepresentationofacquiredalloantigensonDNTcellsallowsforthespecificinteractionbetweenDNTregcellsandalloantigenreactiveeffectorTcells.OncetheDNTregandtargetcellshavecomeintocontact,killingisthenmediatedbyFas/Fas-ligandinteractions,andperhapsthroughotherunidentifiedpathways.Furthercharacterizationofthefunctions,molecularexpressionandmechanismsofactivationofDNTregcellswillhelpinthedevelopmentofnoveltherapiestoinduceantigenspecifictolerancetoselfandforeignantigens.Cellular&MolecularImmunology.2004;1(5):328-335.
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简介:AtheoreticalanalysisontheelectricdoublelayerformednearthesurfaceofaninfinitecylinderwithanellipticalcrosssectionandaprescribedelectricpotentialinanionicconductorwasperformedusingthelinearizedGouy–Chapmantheory.Asemi-analyticalsolutionintermsoftheMathieufunctionswasobtained.Thedistributionsoftheelectricpotential,cations,anions,andelectricfieldwerecalculated.Theeffectsofvariousphysicalandgeometricparameterswereexamined.Thefieldsvaryrapidlyneartheellipticalboundaryandarenearlyuniformatfarfield.Electricfieldconcentrationswerefoundattheendsofthesemi-majorandsemi-minoraxesoftheellipse.Theseconcentrationsaresensitivetothephysicalandgeometricparameters.
简介:Inthisstudy,tungsten(W)wascoatedonacopper(Cu)substratebyusingdouble-glowdischargetechniqueusingapureWpanelasthetargetandargon(Ar)asthedischargeandsputteringgas.ThecrystalstructureoftheWcoatingwasexaminedbyX-raydiffraction(XRD).Scanningelectronmicroscopy(SEM)wasperformedwithcross-sectionimagestoinvestigatethepenetrationdepthofWintotheCubody.Additionally,thepropertiesofwearabilityresistance,corrosionresistanceandmechanicalstrengthoftheWcoatedCumatrixwerealsomeasured.Itisconcludedthatindouble-glowplasma,WcoatedCucanbefacilelyprepared.ItisnoticedthatthetreatmenttemperatureheavilydominatesthepropertiesoftheW-Cucomposite.
简介:ItisshownthatananomalyofthespectrumtakesplaceintheinterferencefieldwhenYoung'sdouble-slitinterferenceexperimentisilluminatedbyspatiallycoherentpolychromaticlight.Specifically,drasticspectralchanges(i.e.thespectralshiftsexhibitarapidtransition)occurinthevicinityofthedarkfringes.Thepotentialapplicationsofthisspectralanomalyarealsoconsidered.
简介:ANASYMPTOTICPROPERTYOFTHENUMBEROFSPANNINGTREESOFDOUBLEFIXEDSTEPLOOPNETWORKSYONGXUERONGANDZHANGFUJIAbstract.LetT(C(p,1,q))bet...
简介:Atheoreticalstudyofresonanttunnelingiscarriedoutforaninverseparabolicdouble-barrierstructuresubjectedtoanexternalelectricfield.Tunnelingtransmissioncoefficientanddensityofstatesareanalyzedbyusingthenon-equilibriumGreen’sfunctionapproachbasedonthefinitedifferencemethod.Itisfoundthattheresonantpeakofthetransmissioncoefficient,beingunityforasymmetricalcase,reducesundertheappliedelectricfieldanddependsstronglyonthevariationofthestructureparameters.
简介:Thefreevibrationproblemofrectangularthinplatesisrewrittenasanewuppertriangularmatrixdifferentialsystem.Fortheassociatedoperatormatrix,wefindthatthetwodiagonalblockoperatorsareHamiltonian.Moreover,theexistenceandcompletenessofnormedsymplecticorthogonaleigenfunctionsystemsofthesetwoblockoperatorsaredemonstrated.Basedonthecompleteness,thegeneralsolutionofthefreevibrationofrectangularthinplatesisgivenbydoublesymplecticeigenfunctionexpansionmethod.
简介:Rotatingdisksubjectedtostationarysliderloadingsystemisaverycommonmechanicalstructure.Thispaperinvestigatesthemultibodydynamicsofarotatingflexibleannularthindisksubjectedtodoublesliderloadingsystems.Alongtherotatingdiskradialandcircumferentialdirections,twostationarysliderloadingsystemsaredistributed.SystemdynamicmodelissolvedbyGalerkin'smethod,andthennaturalfrequency,dynamicstabilityandmodeshapearedeterminedwithaquadraticeigenvalueproblem.Effectsofthedistributingpositionsandinteractionmechanismofthedoublesliderloadingsystemsonnaturalfrequency,dynamicstabilityandmodeshapearediscussedandinvestigated.