学科分类
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107 个结果
  • 简介:Thepaperpresentsthevariationalformulationandwellposednessofthecouplingmethodoffiniteelementsandboundaryelementsforradiationproblem.Theconvergenceandoptimalerrorestimatefortheapproximatesolutionandnumericalexperimentareprovided.

  • 标签: FORMULATION VARIATIONAL APPROXIMATE radia 日主 鲁石
  • 简介:近年来数字摄影之所以能够蓬勃发展,与图像处理软件的不断升级进步有很大关系。也许其中贡献最大的就是Adobe公司。这家公司不但出品了著名的Photoshop软件,还推出了一款价格相对低廉、专供家庭使用的图像处理软件——PhotoshopElements。

  • 标签: ELEMENTS PHOTOSHOP软件 图像处理软件 Adobe公司 简便 数字摄影
  • 简介:Whenthered-blacksubdivisionsaresatisfied,aniterativesubstructuringmethodisproposedtosolvethealgebraicsystemofequationsarisingfromthediscretizationofsymmetricellipticproblemsvianonconformingfiniteelementswhichareonlycontinuousatthequasi-uniformmeshnodes.Theoreticalanalysisisgivenandtheresultsofnumericalexperimentsarereported.

  • 标签: DOMAIN DECOMPOSITION nancoforming ELEMENT substructme
  • 简介:Adsorptionanddesorptionofexogenousrareearthelements(REE)insoilswerestudied.ResultsshowedthatsoilshadstrongadsorbabilityforREEandtherateofadsorptionofREEwasover95%oftheaddedREEinthesetests.ThecharacteristicsofadsorptionisothermscorrespondedwellwiththebothFreundlichandTemkinequations,butdeviatedfromtheLangmuirequation.TheadsorptionofREEtendedtoincreasewiththerisingofsoilpH.AsequentialextractionmethodusedforstudingthedesorptionanddistributionofREEsorbedinsoilsarealsodiscussed.

  • 标签: 土壤成分 稀土元素 吸附作用 解吸附作用 外生稀土元素 形态
  • 简介:"TheEgg",whichisregardedasmostdeservingtobeplaced"amongthegreatstoriesoftheworld"(Howe168),issurelythebestexampleofSherwoodAnderson’sshortfictions,ofwhichthethemeisaccuratelysummarizedbyYaoxinChanginhisASurveyofAmericanLiterature:

  • 标签: 职业技术学院 张家口 外语系
  • 简介:Wesystematicallyanalyzetheexperimentaldataofalphadecayineven-evenheavynucleifarfromstabilityandfindthattheGeiger-Nuttalllawbrea~sforanisotopicchainwhenitsneutronnumberisacrossamarcnumberorthereisadeformedsubshell.Thisbreakcanbeusedtoidentifynewmagicnumbersofsuperheavynuclei.Itisalsodiscoveredthatthereisanewlinearrelationbetweenthelogarithmofhalf-lifeandthereciprocalofthesquarerootofdecayenergyforN=126andN=152isotones.Itcouldbeanewlawofalphadecayfornucleiwithmagicneutronnumbersbutthephysicsbehinditistobeexplored.Thesignificanceoftheseresearchesforthesearchofnewelementsisdiscussed.

  • 标签: Α衰变 壳层结构 幻数 超重元素 原子核物理
  • 简介:Thestressanalysisofthehumanfemurisconsiderablycomplicated.Inadditiontothemotionalpostureandtheloadingconditionofthefemur,itisgreatlyrelatedtoitsgeometryandbonystructureindifferentparts.Inpreviousresearches,themeansoffemoralshapeusinginthefinite-element-analysiswasobtainedbymeansofapply-ingtheradiographswhichweretheninputincomputer.Obviously,theresultswereneitherrealnorprecise.Inthispaper,thecomputerimageprocessingwasusedtogetthegeometryandthesizeofthehumanfemur,whichcouldmakethefinite-ele-

  • 标签: FEMUR FEMORAL considerably motional PRECISE apply
  • 简介:BasedonthebiogeochemicalstudiesonnutrientelementsintheChangjiangestuary,themainresultsandrecentprogressesarereviewedinthispaper,suchasthenutrientfluxesintothesea,themixingbehaviors,thedistributioncharacteristicsandtransportationaswellasthebiogeochemicalbehaviorsofnutrientsintheplumefrontalregion.Theexploringdirectionsandresearchemphasesinthefutureareproposed.

  • 标签: 生物地球化学 营养元素 长江 入口处
  • 简介:Inthispaper,aneffectivemethodofsimulatingthespatialdistributionofclimaticelementsinmountainousareasbyusingthesemi-empiricaltheoryispresented.Asanexample,thespatialdistributionsoftemperature,vaporpressure,relativehumidity,windspeedandprecipitationintheJianyangregionandtheShaxibasinofFujianProvincearecomputedwiththismethod,andthesimulatedresultsareingoodagreementwiththeobservations.

  • 标签: CLIMATIC humidity METEOROLOGICAL TERRAIN latitude ALTITUDE
  • 简介:ONTHESELECTIONOFSHAPEFUNCTIONSPACESOFTRIANGULARPLATEELEMENTSChenShaochun;ShiDongyang(Dept.ofSys.Sci.&Math.,ZhengzhouUniv.,Zhe...

  • 标签: unconforming FINITE ELEMENT SHAPE function space
  • 简介:ConsiderL2-projectionuhofuton-degreefiniteelementspaceonone-dimensionaluniformgrids.TwodifferentclassesoftheorthogonalexpansioninanelementforconstructingasuperclosetofunctionuhareproposedandthensuperconvergenceforbothuhandDuhareproved.Whennisoddandnoboundaryconditionsareprescribed,thenuhisofsuperconvergenceatn+1orderGausspointsGn+1ineachelement.Whennisevenandfunctionvaluesontheboundaryareprescribed,thenuhisofsuperconvergenceatn+1orderpointsZn+1ineachelement.Iftheotherboundaryconditionsaregiven,thentheconclusionsarevalidinallelementsthatitsdistancefromtheboundary≥ch|lnh|.Theaboveconclusionsarealsovalid.forn-dergreerectangularelementQ1(n).

  • 标签: Superconvegence L~2-projection FINITE elements.
  • 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.

  • 标签: 花岗岩 成岩矿物 示踪元素 稀土元素 广东 广西