简介:Thepaperpresentsthevariationalformulationandwellposednessofthecouplingmethodoffiniteelementsandboundaryelementsforradiationproblem.Theconvergenceandoptimalerrorestimatefortheapproximatesolutionandnumericalexperimentareprovided.
简介:Whenthered-blacksubdivisionsaresatisfied,aniterativesubstructuringmethodisproposedtosolvethealgebraicsystemofequationsarisingfromthediscretizationofsymmetricellipticproblemsvianonconformingfiniteelementswhichareonlycontinuousatthequasi-uniformmeshnodes.Theoreticalanalysisisgivenandtheresultsofnumericalexperimentsarereported.
简介:Adsorptionanddesorptionofexogenousrareearthelements(REE)insoilswerestudied.ResultsshowedthatsoilshadstrongadsorbabilityforREEandtherateofadsorptionofREEwasover95%oftheaddedREEinthesetests.ThecharacteristicsofadsorptionisothermscorrespondedwellwiththebothFreundlichandTemkinequations,butdeviatedfromtheLangmuirequation.TheadsorptionofREEtendedtoincreasewiththerisingofsoilpH.AsequentialextractionmethodusedforstudingthedesorptionanddistributionofREEsorbedinsoilsarealsodiscussed.
简介:Wesystematicallyanalyzetheexperimentaldataofalphadecayineven-evenheavynucleifarfromstabilityandfindthattheGeiger-Nuttalllawbrea~sforanisotopicchainwhenitsneutronnumberisacrossamarcnumberorthereisadeformedsubshell.Thisbreakcanbeusedtoidentifynewmagicnumbersofsuperheavynuclei.Itisalsodiscoveredthatthereisanewlinearrelationbetweenthelogarithmofhalf-lifeandthereciprocalofthesquarerootofdecayenergyforN=126andN=152isotones.Itcouldbeanewlawofalphadecayfornucleiwithmagicneutronnumbersbutthephysicsbehinditistobeexplored.Thesignificanceoftheseresearchesforthesearchofnewelementsisdiscussed.
简介:Inthispaper,thesupercouvergenceofaclassofWilson-likeelementsisconsidered,andasuperconvergentestimateofWilson-likeelementsisobtainedforstrongregularmeshes.
简介:Thestressanalysisofthehumanfemurisconsiderablycomplicated.Inadditiontothemotionalpostureandtheloadingconditionofthefemur,itisgreatlyrelatedtoitsgeometryandbonystructureindifferentparts.Inpreviousresearches,themeansoffemoralshapeusinginthefinite-element-analysiswasobtainedbymeansofapply-ingtheradiographswhichweretheninputincomputer.Obviously,theresultswereneitherrealnorprecise.Inthispaper,thecomputerimageprocessingwasusedtogetthegeometryandthesizeofthehumanfemur,whichcouldmakethefinite-ele-
简介:BasedonthebiogeochemicalstudiesonnutrientelementsintheChangjiangestuary,themainresultsandrecentprogressesarereviewedinthispaper,suchasthenutrientfluxesintothesea,themixingbehaviors,thedistributioncharacteristicsandtransportationaswellasthebiogeochemicalbehaviorsofnutrientsintheplumefrontalregion.Theexploringdirectionsandresearchemphasesinthefutureareproposed.
简介:Inthispaper,aneffectivemethodofsimulatingthespatialdistributionofclimaticelementsinmountainousareasbyusingthesemi-empiricaltheoryispresented.Asanexample,thespatialdistributionsoftemperature,vaporpressure,relativehumidity,windspeedandprecipitationintheJianyangregionandtheShaxibasinofFujianProvincearecomputedwiththismethod,andthesimulatedresultsareingoodagreementwiththeobservations.
简介:ConsiderL2-projectionuhofuton-degreefiniteelementspaceonone-dimensionaluniformgrids.TwodifferentclassesoftheorthogonalexpansioninanelementforconstructingasuperclosetofunctionuhareproposedandthensuperconvergenceforbothuhandDuhareproved.Whennisoddandnoboundaryconditionsareprescribed,thenuhisofsuperconvergenceatn+1orderGausspointsGn+1ineachelement.Whennisevenandfunctionvaluesontheboundaryareprescribed,thenuhisofsuperconvergenceatn+1orderpointsZn+1ineachelement.Iftheotherboundaryconditionsaregiven,thentheconclusionsarevalidinallelementsthatitsdistancefromtheboundary≥ch|lnh|.Theaboveconclusionsarealsovalid.forn-dergreerectangularelementQ1(n).
简介:GranitoidsarewidelyspreadintheNanlingRegionofChina.FourrockbodiesintheregionthebeenstudiedfortheirREE,Rb,Sr,BaandScdistributions.Thefourrockbodiesoccurredindifferentlocationsandarecharacterizedasbeingdifferentinageandtype.Therocktypesarepresentedasfollows:Qinghumonzonite,Guangxi;Fuxigranodiorite,Guangdong;Jiufengmonzoniticgranite,Hunan;ZudongK-feldspargranite,Jiangxi.FromthemajorandtraceelementdistributionsinthesegranitoidsitisclearlyshownthatRb/SrratiosintherockstendtoincreasewithincreasingSiO2contentanddifferentiationindex(DI),butLREE/HREE,La/YbandK/Rbratiostendtodecrease,suggestingacorrelationbetweentraceelementdistributionandmajorelementcompositionforthegranitoids.Thedistributioncharacteristicsoftraceelementsineachoftherockbodiesaredescribedindetail.FromthecomparativeanalysisoftheQinghumonzoniteandFuxigranodioriteitisevidencedthattheREEdistributioniscloselyrelatedtothesequenceofcrystallizationfortheminerals,andalsotothepetrochemicaltypesofthesegranitoidsinadditiontotheircrystalchemistry.