简介:Aprojectedsubgradientmethodforsolvingaclassofset-valuedmixedvariationalinequalities(SMVIs)isproposedwhenthemappingisnotnecessarilyLipschitz.Undersomesuitableconditions,itcanbeproventhatthesequencegeneratedbythemethodcanstronglyconvergetotheuniquesolutiontotheproblemintheHilbertspaces.
简介:Amethodofmulti-beamfemtosecondlaserirradiationcombinedwithmodifiedHF-HNO_3-CH_3COOHetchingisusedfortheparallelfabricationofall-siliconplano-concavemicrolensarrays(MLAs).Thelaserbeamissplitbyadiffractiveopticalelementandfocusedbyalenstodrillmicroholesparallelyonsilicon.AnHF-HNO_3-H_2SO_4-CH_3COOHsolutionisusedtoexpandandpolishlaser-ablatedmicroholestoformmicrolenses.ComparedwiththeHF-HNO_3-CH_3COOHsolution,thesolutionwithH_2SO_4caneffectivelyreducetheetchedsurfaceroughness.ThemorphologiesofMLAsatdifferentlaserpowersandpulsenumbersareobserved.Theimagearrayformedbythesiliconmicrolensesisalsodemonstrated.
简介:Er3+-dopedheavymetalborosilicateglasseswerepreparedusingconventionalmeltingandquenchingmethod.Theemissionspectraof4Ⅰ13/2→4Ⅰ15/2transitionwereobserveduponexcitationat974nmandthelifetimeof4Ⅰ13/2levelofEr3+wasmeasured.Basedonthesedata,thefluorescencepropertiesofEr3+areinvestigatedontheemissionandgaincharacteristicsatthe1.5μmbands.Inparticular,theeffectofrelativeheavymetalcontentonfluorescencepropertiesisdiscussed.
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简介:Inthispaper,westudythemixedelementmethodforSobolevequations.Atime-discretizationprocedureispresentedandanalysedandtheoptimalordererrorestimatesarederived.Forconvenienceinpracticalcomputation,analternating-directioniterativeschemeofthemixedfi-niteelementmethodisformulatedanditsstabilityandconverbenceareprovedforthelinearprob-lem.Anumericalexampleisprovidedattheendofthispaper.
简介:AseriesofTiO2-XSiO2[Xdenotesthemolarfraction(%)ofsilicainthemixedoxides]withdifferentn(Ti)/n(Si)ratioswaspreparedwithammoniawaterasahydrolysiscatalyst.ThephotocatalystspreparedwerecharacterizedbyXRD,thermalanalysis,FTIR,UV-VisandSPS.ThecharacterizationresultsofFTIRandUV-VisspectrashowthatTiatomsweregraduallychangedfromoctahedralcoordinationtotetrahedralcoordinationwiththeadditionofsilica,whichisnotbeneficialforobtainingstrongBrnstedacidityandhigherphotocatalyticactivity.Thephotocatalyticactivityexperiments,whichwereconductedbyusingheptane(orSO2)asthemodelreactant,showedthatTiO2-SiO2containingasuitableamountofsilicacanexhibitmuchhigherphotocatalyticactivitythanpureTiO2.Theenhancedphotocatalyticactivitycanbeattributedtothreefollowingfactors:(1)smallercrystallinesize;(2)higherthermalstability;(3)thenewstrongBrnstedacidity.
简介:Tow-phaseflowmixedvariationalformulationsofevolutionfiltrationproblemswithseawaterintrusionareanalyzed.Adualmixedfractionalflowvelocity-pressuremodelisconsideredwithanair-freshwaterandafreshwater-seawatercharacterization.Foranalysisandcomputationalpurposes,spatialdecompositionsbasedonnonoverlappingmultidomains,aboveandbelowthesealevel,arevariationallyintroducedwithinternalboundaryfluxesdualizedasweaktransmissionconstraints.Further,parallelaugmentedandexactlypenalizeddualityalgorithms,andproximationsemi-implicittimemarchingschemes,areestablishedandanalyzed.
简介:Anewalgorithmforthesolutionofquadraticprogrammingproblemsisputforwardintermsofthemixedenergytheoryandisfurtherusedfortheincrementalsolutionofelastic-plastictrussstructures.Themethodproposedisdifferentfromthetraditionalone,forwhichtheunknownvariablesareselectedjustinoneclasssuchasdisplacementsorstresses.Thepresentmethodselectsthevariablesinthemixedformwithbothdisplacementandstress.Asthemethodisestablishedinthehybridspace,theinformationfoundinthepreviousincrementalstepcanbeusedforthesolutionofthepresentstep,makingthealgorithmhighlyeffi-cientinthenumericalsolutionprocessofquadraticprogrammingproblems.Theresultsobainedintheexam-plesoftheelastie-plasticsolutionofthetrussstructuresverifywhathasbeenpredictedinthetheoreticalanal-ysis.
简介:Highqualitypoly(5-cyanoindole)(P5CI)filmswereelectrosynthesizedbydirectanodicoxidationof5-cyanoindoleonstainlesssteelsheetinthemixedelectrolytesofborontrifluoridediethyletherate(BFEE)anddiethylether(EE)(byvolume1:1)+0.05molL~(-1)Bu_4NBF_4.Thefilmformedcanbepeeledofftheelectrodeintofreestandingfilms.TheadditionofEEintoBFEEcanimprovethesolubilityofmonomer.P5CIfilmsobtainedfromthismediumshowedexcellentelectrochemicalbehaviorwithconductivityof10~(-2)Scm~(-1).Structuralstudiesshowedthatthepolymerizationof5-cyanoindoleoccurredatthe2,3position.As-formedP5CIfilmswerethoroughlysolubleinstrongpolarorganicsolventdimethylsulfoxide(DMSO)whilepartlysolubleintetrahydrofuran(THF)oracetone.FluorescencespectralstudiesindicatedthatP5CIwasagoodblue-lightemitter.
简介:Anadaptivemeshfiniteelementmodelhasbeendevelopedtopredictthecrackpropagationdirectionaswellastocalculatethestressintensityfactors(SIFs),underlinear-elasticassumptionformixedmodeloadingapplication.Thefiniteelementmeshisgeneratedusingtheadvancingfrontmethod.Inordertosuittherequirementsofthefractureanalysis,thegenerationofthebackgroundmeshandtheconstructionofsingularelementshavebeenaddedtothedevelopedprogram.Theadaptiveremeshingprocessiscarriedoutbasedontheposterioristresserrornormschemetoobtainanoptimalmesh.Previousworksoftheauthorshaveproposedtechniquesforadaptivemeshgenerationof2Dcrackedmodels.Facilitatedbythesingularelements,thedis-placementextrapolationtechniqueisemployedtocalculatetheSIF.Thefractureismodeledbythesplittingnodeapproachandthetrajectoryfollowsthesuccessivelinearextensionsofeachcrackincrement.TheSIFsvaluesfortwodifferentcasestudieswereestimatedandvalidatedbydirectcomparisonswithotherresearcherswork.
简介:Asystematicstudyonthesynthesisandantibacterialactivityofthequaternary"onium"saltsgraftedonaninsoluble"gel-type"stryene-7%divinylbenzenecopolymerbypolymer-analogousreactionsisshowed.Antibacterialactivityofquaternaryammoniumand/orphosphoniumsaltsgraftedonpolymer-supportshasbeenstudiedagainststaphylococcusaureusandEscherichiacoli.Awidevarietyof"onium"saltsboundtomacromolecularsupportswithdifferentquaternarygroupsanddifferentquaternarychainlengthsubstituentswereexamined.Theantibacterialactivityofmixed"onium"saltsincreasesasaconsequenceoftheassociationofammoniumandphosphoniumsaltsgraftedonthesamepolymericsupport.
简介:印射土壤硝酸盐氮(NO3-N)的空间分发是重要的指导氮申请以及估计沥滤进地下水的NO3-N的环境风险。我们采用了univariate和混合geostatistical方法在东北佛罗里达越过一处风景印射土壤NO3-N的空间分发。土壤样品从四深度增长被收集(030,3060,60120和120180厘米)基于土壤,土地使用和举起阶层从用成层的随机识别并且嵌套采样的147个采样地点设计。在二层是的顶的土壤NO3-N分布空间地,汽车相关并且印射使用木头正常kriging。为NO3-N预言的环境关联模型用线性、非线性的回归方法被导出,并且采用了开发NO3-N趋势地图。陆地使用和它从卫星形象导出的相关变量作为重要变量被识别用环境关联模型预言NO3-N。当木头正常kriging生产了顺利变化的地图时,从环境关联模型导出的趋势地图产生了空间地异构的地图。趋势地图与趋势模型剩余的平常的kriging预言被相结合开发回归kriging预言地图,它给了最好的NO3-N预言。因为土地使用和遥远地察觉到的数据是容易地可得到的并且有大部分,与地相比的更好的空间分辨率取样了土壤,我们的调查结果基于为风景的使用和遥远地察觉到的数据放大土壤NO3-N印射的土地建议了环境关联模型的功效。实现的方法论为在另外的风景土壤NO3-N印射是可转让的。