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366 个结果
  • 简介:ThepreparationofhybridmesoporousMCM-48graftedbyvinylgroupviapost-graftingprocesswasreportedandstudiedbyX-raydiffraction,BETand29SisolidMASNMR.Anorganicβ-diketonateEuropiumcomplexthecorrespondingluminescencepropertywascharacterized.

  • 标签: MESOPOROUS HYBRID materials RARE earths
  • 简介:ThispaperderivestheLindellformulabasedonthegeneralizedvariationalprinciple.ForthecomplexdielectricconstantmeasurementofasmalllossydielectricrodwithRayleigh-Ritzmethod,anaccuratevariationalanalysisisgiven.Theconceptofcomplexfrequencyisintroducedingeneral,andthestabilityofthesolutionisdiscussed.Comparingwiththeresultofperturbationmethod,itisconcludedthatthedeviationofperturbationalgorithmshouldbetakenintoconsideration.

  • 标签: General VARIATIONAL principle Lindell FORMULATION Complex
  • 简介:Acrylateterpolymer-boundSe,Nbidentateligandwassynthesizedfromthesidechainchlorineofcopolymerandβ-dimethylamino-β′-hydroxyl-diethylselenoether.Thepolymer-supportedplatinumcomplexexhibitedhighcatalyticactivityinthehydrosilylationofolefinswithtriethoxysilane.

  • 标签: 合成 催化活性 铂络合物 双配位基
  • 简介:在这,为解决复杂线性矩阵方程AXB=C的切开的纸,修改Hermitian和skew-Hermitian(MHSS)重复方法被介绍了。作为理论分析表演,MHSS重复方法将在某些条件下面收敛。在这个方法的每次重复与真实对称的积极明确的系数矩阵要求四个线性矩阵方程的答案,尽管原来的系数矩阵是建筑群和non-Hermitian。另外,新重复方法的最佳的参数被建议。数字结果证明那个MHSS重复方法有效、柔韧。[从作者抽象]

  • 标签: 线性矩阵方程 迭代法 HSS 改良 实对称正定矩阵 迭代方法
  • 简介:Pd/C向polyketones(PK)的形成催化的公司和苯乙烯的copolymerization在N-valeronitrile-N-methylimidazoliumhexafluorophosphate被学习([C4CNmim]+PF6)中等。综合PK被Fourier变换描绘红外线(FTIR),元素的分析,13C-nuclear磁性的回声(13C-NMR),微分扫描热量测定(DSC),thermogravimetric分析(TGA)和胶化浸透层析(GPC)。Pd/C催化剂的表面上的支持的离子的液体电影能阻止产品用金属离子由于它的化学稳定性和弱协作能力盖住活跃的碳的洞,并且高效地因此改进催化活动。在催化剂的催化活动和PK的分子的重量的离子的液体的不同数量的效果被讨论。离子的液体的用法什么时候是10wt%(0.1g离子的液体/1g活跃的碳搬运人)并且Pd2+的理论内容是5wt%(0.05gPd2+/1g活跃的碳搬运人),最高催化的活动2963.64gSTCO/(gPd訐?訐??

  • 标签: 离子液体 催化剂 苯乙烯 Pd 共聚 CO
  • 简介:ThereisabeltofmetamorphiccorecomplexesinthewesternmarginoftheYangtzecraton.ThegeologicalsettingofthebeltissimilartothatoftheCordilleranmetamorphiccorecomplexes.AtypicaloneinthisbeltistheJianglangmetamorphiccorecomplex,whichhasaconfigurationconsistingofthreelayers:acorecomplexconsistingofMesoproterozoicschistsequence,aductilemiddleslabconsistingofPaleozoicmeta-sedimentary-basaltcharacterizedbythedevelopmentof"foldinglayer"andanuppercoverconsistingofXikangGroupwhichhassufferedbothbucklingandflattening.AdetachmentfaultdevelopedalongthecontactboundarybetweenthecoverandbasementcausestheomissionofUpperSinianandCambrianatthebaseofcover.Alotofnormalductileshearzonesdevelopedinthecovercausesthethinningofit.Allthefeaturesshowthattheearlyextensionresultsinthethinningofcrust,buttheformationofthedomeandexposureofbasementrocksmaybetheresultsofsuperimp

  • 标签: METAMORPHIC core complex EXTENSIONAL structure WESTERN
  • 简介:TheradiatedfieldsGaussianDistributedAperture(GDA)canbeapproximatelyanalyzedbytheComplexRayMethod(CRM).Inthisarticle,theradiatedfieldsderivedintermsofplanewavespectrumintegralareusedasstandard,andtheerrorsourceofthereplacementbycomplexrayfieldsisfound.WithdiscussionsontheerrorcharacteristicsofthisCRMapproximation,conclusionsaredrawnwhichareexpectedtobehelpfulinapplicationsofCRM.

  • 标签: 复合光线法 高斯光束 平面波光谱 辐射
  • 简介:双树的复杂小浪变换是在信号并且图象处理的一个有用工具。在这份报纸,我们建议双树的复杂小浪变换(?WT)为图象inpainting的基于的算法问题。我们的途径基于蔡,禅宗,沈和Shens基于framelet的算法。复杂小浪变换在移动不变性,directionality和抗混叠的意义超过标准真实小浪变换。数字结果说明我们的算法的好表演。

  • 标签: 二元树复小波变换 图像修复 平移不变性 图像处理 数值结果 ING
  • 简介:Themainpurposeofthispaperistostudytheproblemsontheexistenceofalgebraicsolutionsforsomesecond-ordercomplexdifferentialequationswithentirealgebraicfunctionelementcoefficients.Severaltheoremsontheexistenceofsolutionsareobtained,whichperfectthesolutiontheoryoflinearcomplexdifferentialequations.

  • 标签: 复微分方程 代数解 二阶 元素 解的存在性 代数函数
  • 简介:ThetreatmentoftheGacuncomplexCu-PbbulkconcentratewithhighZn,Ag,etc.,byoxygenpressureacidleachingwasstudied.Theprimarycopperandleadmineralsintheconcentratearetetrahedriteandgalena.Thetreatmentoftetrahedritewasrarelystudied,andmostofsilveroccurredinthemineraltoo.Theoptimumoperatingparametersofoxygenpressureacidleachingwereestablishedbyconditionaltests.Undertheseparameters,theresultofpilotscaletestshowedthattheleachingpercentagesofcopperandzincwereseparatelyashighas98.9wt.%and94.9wt.%,whileleadandsilverweretransformedintosulfateandsulfideprecipitations,respectively.Thecopperandzincinlixiviumwerereclaimedbyextraction-electrowinningandpurification-electrowinning,respectively,andtheleadandsilverintheresiduewerereclaimedseparatelybycarbonatetransformation-silicofluoricacidleachingandthiourealeaching.

  • 标签: 非铁的冶金学 合成回收 沥滤的氧压力酸 复杂 Cu-Pb 体积专注 黝铜矿
  • 简介:OneofthemajoraromaticsprojectsatthePetroChinaUrumqiPetrochemicalCompany—theconstructionof1.0Mt/aparaxylene/aromaticsintegratedunitwasofficiallykickedoffonMay1,2008inUrumqi.Theinvestmentinthisunittotals3.867billionRMB,makingthisunitthelarg-estsingle-seriesone-million-ton-classaromaticsintegratedunitamongtheworld'ssimilarunits.

  • 标签: 石化行业 石化产品 投资 工艺
  • 简介:Anovelhybridapproachforearthquakelocationisproposedwhichusesacombinedcoarseglobalsearchandfinelocalinversionwithaminimumsearchroutine,plusanexaminationoftherootmeansquares(RMS)errordistribution.ThemethodexploitstheadvantagesofnetworkraytracingandrobustformulationoftheFréchetderivativestosimultaneouslyupdateallpossibleinitialsourceparametersaroundmostlocalminima(includingtheglobalminimum)inthesolutionspace,andfinallytodeterminethelikelyglobalsolution.Severalsyntheticexamplesinvolvinga3-Dcomplexvelocitymodelandachallengingsource-receiverlayoutareusedtodemonstratethecapabilityofthenewly-developedmethod.Thisnewglobal-localhybridsolutiontechniquenotonlyincorporatesthesignificantbenefitsofourrecentlypublishedhypocenterdeterminationprocedureformultipleearthquakeparameters,butalsoofferstheattractivefeaturesofglobaloptimalsearchingintheRMStraveltimeerrordistribution.Unlikethetraditionalglobalsearchmethod,forexample,theMonteCarloapproach,wheremillionsoftestshavetobedonetofindthefinalglobalsolution,thenewmethodonlyconductsamatrixinversiontypelocalsearchbutdoesitmultipletimessimultaneouslythroughoutthemodelvolumetoseekaglobalsolution.ThesearchisaidedbyinspectionoftheRMSerrordistribution.Benchmarktestsagainsttwopopularapproaches,thedirectgridsearchmethodandtheoct-treeimportantsamplingmethod,indicatethatthehybridglobal-localinversionyieldscomparablelocationaccuracyandisnotsensitivetomodestlevelofnoisedata,butmoreimportantlyitofferstwo-orderofmagnitudespeed-upincomputationaleffort.Suchanimprovement,combinedwithhighaccuracy,makeitapromisinghypocenterdeterminationschemeinearthquakeearlywarning,tsunamiearlywarning,rapidhazardassessmentandemergencyresponseafterstrongearthquakeoccurrence.

  • 标签: 反演方法 地震定位 混合
  • 简介:TwoEu(Ⅲ)complexes,(tris-4,4,4-trifluoro-1-phenyl-1,3-butanedione)(1,10-phenanthroline)europium(Ⅲ)[Eu(tpb-H)3(phen)]and(tris-4,4,4-trifluoro-1-phenyl-1,3-butanedione)(2,2'-bipyridine)europium(Ⅲ)[Eu(tpb-H)3(bipy)]weresynthesizedfrombi-dentaloxygenandnitrogenligands.LuminescentpolymerswerefabricatedbyincorporatingdeuteratedEu(Ⅲ)complexesinpoly(methylmethacrylate)(PMMA)matrixes.LuminescentPMMAcontainingEu(tpb-D)3(phen)exhibitedrelativelyhigherquantumyield[Φ,(48.7±4)%],fasterradiationrate(kr,7.49×102s-1),sharperredemission[fullwidthathalfmaximum(FWHM),6.3nm]andlargerstimulatedemissioncross-section(SEC,1.29×10-20cm2).ThevalueofSECisthesameorderasthatofNd-glasslaserforpracticaluse.Additionally,thethermalpropertiesofEu(tpb-H)3(phen),Eu(tpb-H)3(bipy),Eu(tpb-D)3(phen)-PMMA,andEu(tpb-H)3(bipy)PMMAwerestudied,indicatingthattheEu(Ⅲ)complexesandluminescentPMMAcanbeusedforalong-termperiodinhightemperatureenvironment.PreparedluminescentpolymersincludingEu(tpb-D)3(phen)havepromisingapplicationsinnovelorganicEu(Ⅲ)devices,suchasthehigh-powerlasermaterialsandopticalfibers.

  • 标签: 聚甲基丙烯酸甲酯 发光量子效率 复合掺杂 辐射率 受激发射截面
  • 简介:AIMTo在在为复杂网膜的detachment.METHODSWe经历retinectomy的病人的硅酮油(ROSO)的移动执行了为复杂网膜的分开在retinectomy以后经历了ROSO的病人的回顾的盒子笔记评论以后,评估功能的结果。有不到6mo的病人列在后面在上面并且周期性的网膜的分开追随者ROSO是excluded.RESULTSThirty--六个病人被包括。吝啬的最好改正的视觉尖酸(BCVA)pre-ROSO是1.13logMAR(SD0.5)。吝啬的BCVA3mo追随者ROSO是1.16logMAR(SD0.53),6mo追随者ROSO1.13(SD0.63),和跟随ROSO1.18(SD0.69)的12mo。在在ROSO以后的12mo,BCVA在38.9%病人改善了,在25%仍然保持未改变,并且尽管在在在3点的ROSO以后的BCVA没有统计重要差别,在36.1%败坏了,6并且12mo(P=0.93)。retinectomy的尺寸从15°;到270°;(SD53)并且没影响.CONCLUSIONThere是的视觉结果(P=0.11)在在pre-和柱子之间的BCVA的没有统计上重要的差别--为复杂网膜的分开的ROSO后面的retinectomy。在与retinectomy的尺寸有关的视觉结果没有统计差别。

  • 标签: 硅酮油的移动 retinectomy 复杂网膜的分开 视觉尖酸 VITRECTOMY
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