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401 个结果
  • 简介:用maghnite-H+的tetrahydrofuran的cationic戒指洞聚合被报导。Maghnite-H+,从质子发出的无毒的稳固的催化剂被交换montmorillonite泥土。Polytetrahydrofuran,也poly打电话(butandiol)醚,与醋酸盐和氢氧根结束,组们成功地被综合。反应温度,开始者/单体的重量比率和单体的变换上并且在分子的重量上的反应时间的效果被调查。反应的cationic机制被建议。这化学能为poly准备被看作一条合适的线路(THF)作为为热塑的弹性体的一个软片断。

  • 标签: 阳离子开环聚合 四氢呋喃环 固体催化剂 单体转化率 热塑性弹性体 蒙脱石粘土
  • 简介:ConstructingareasonablereactionkineticmodelforCr-containingwasteincinerationisofhighsignificancetostudytheeffectofvariousfactors,suchastemperature,Cl,onitshexavalentchromiumcompounds.Inthispaper,aprimaryCr/H/Air/ClreactionkineticmodelisbuiltandstudiedbyGaussian03codewithquantumchemistrytheory.Numericalresultsshowthattherearetwooverallreactionsinthemodel,eachofthetwooverallreactionsconsistsoftheirrespectivetwoelementaryreactions.Sothetwooverallreactionsshouldbeomittedfromthemodel.Instead,thefourelementaryreactionsshouldbeaddedintheCr/H/Air/Clreactionkineticmodel.Theactivationenergiesofthefourelementaryreactionsarealsocalculated.

  • 标签: 动力学模型 高氯 空气 小时 反应活化能 CR
  • 简介:AseriesofMo-impregnatedHβsamples,withMoO3loadinginHβzeoliteinthemassfractionrangeof0.5%-6.0%,werestudiedbymeansofXRDandIRinordertocharacterizetheirstructures.Mo/Hβsampies'crystallinityalmostlinearlydecreaseswithincreasingtheamountofMoO3loaded,TheIRspectraandXRDpatternssuggestthattheprogressivedestabilizationoftheHβzeolitestructureiscausedbyincreasingMoloadingin(MoO3+Hβzeolite).Duringthecalcination,Al2(MoO4)3formedfromthedealuminationofHβzeolite,causesthesubstantiallypartialbreakdownofthezeoliteframeworkwhentheMoloadinginMoO3+Hβisrelativelyhigh.

  • 标签: Hβ沸石负载钼催化剂 X射线衍射 红外光谱 结构
  • 简介:SupposethatDisadivisionringinwhichthereisdefinedananti-automorphismα→(?)isinvolutorial,RisaleftvectorspaceoverD.Usingthegivenanti-automorphismα→(?),itiseasytoturnRintoarightvectorspaceoverDbysetingx(?)=ax.Bilinearformg(x,y)connectingtheleftvectorspaceRandtherightvectorspaceRisaHermitianscalar.

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  • 简介:本文中,给出了非奇异H-矩阵的新判定条件,改进了近期的相关结果,并用数值例子说明了所得结果判定范围的更加广泛性。

  • 标签: 非奇异H-矩阵 不可约 非零元素链
  • 简介:Wedesignafamilyof2DH~m-nonconformingfiniteelementsusingthefullP_(2m-3)degreepolynomialspace,forsolving2mthellipticpartialdifferentialequations.Theconsistenterrorisestimatedandtheoptimalorderofconvergenceisproved.Numericaltestsonthenewelementsforsolvingtri-harmonic,4-harmonic,5-harmonicand6-harmonicequationsarepresented,toverifythetheory.

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  • 简介:§1.IntroductionInthispaperweconsidertheparabolicsystem(?)t/(?)ui-div(|▽u|p-2▽ui)=0(1≤i≤m),withp>1,whereui=ui(x,t),▽=gradxandxvariesinanopendomainΩ(?)RN.Thesystemisdegenerateifp>2orsingularif1

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