简介：Inthispaper,thebrazingmechanismofLY12aluminumalloyatmiddlerangetemperaturewaspresented.TheCsF-AlF3non-corrosivefluxwasutilizedtoremovethecomplexoxidefilmonthesurfaceofLY12aluminumalloy.TheresultsrevealedthattheoxidefilmwasremovedbytheimprovedCsF-AlF3fluxaccompaniedwiththeoccurrenceofreactionaswellasdissolutionandthecompoundsCsFplayedanimportantroletoremovetheoxidefilm.Actually,thehighactivityofflux,say,theabilitytoremovetheoxidefilm,wasduetothepresenceofthecompounds,suchasNH4F,NH4AlF4andcompositemoltensalt.TheproductionofHFwasthekeyissuetoacceleratethereactionandenhancetoeliminatetheoxidefilmbydissolution.ItwasfoundthattherareearthelementLaatsmallpercentagewasnotenrichedattheinterface.Moreover,therareearthfluorideenhancedthedissolutionbehavior.

简介：Thispaperconsidersanotherkindofchemicalreactiondifferentfrom[1].Thedifferenceisthatthechemicalreactionsunderconsiderationareassumedtobeheterogeneous,fast,reversibleandclassical.Asatypicalexample,theauthorreducesthisproblemtoanonephaseStefanproblemwithnoncommondata,andinvestigatestheclassicalsolutionaswellastheweaksolution.

简介：Westudytheexistenceoftravelingwavesolutionsforanonlocalandnon-monotonedelayedreaction-difusionequation.Basedontheconstructionoftwoassociatedauxiliaryreactiondifusionequationswithmonotonicityandbyusingthetravelingwavefrontsoftheauxiliaryequations,theexistenceofthepositivetravelingwavesolutionsforc≥cisobtained.Also,theexponentialasymptoticbehaviorinthenegativeinfnitywasestablished.Moreover,weapplyourresultstosomereactiondifusionequationswithspatio-temporaldelaytoobtaintheexistenceoftravelingwaves.Theseresultscover,complementand/orimprovesomeexistingonesintheliterature.

简介：这篇文章处理在从期末考试的反应散开系统的两次独立的系数预定空间discretized测量使用的重建的一个反的问题在光滑的插值技术的帮助下的优化方法。文章的主要目的是关于同类的Dirichlet边界条件分析线性地联合的反应散开系统的反的问题的解决方案的asymptotic行为。

简介：Inthispaper,weconsideranonlinearsystemofreactiondiffusionequationsarisingfrommathematicalneuroscienceandtwononlinearscalarreactiondiffusionequationsundersomeassumptionsontheircoefficients.Themainpurposeistocoupletogetherlinearizedstabilitycriterion(theequivalenceofthenonlinearstability,thelinearstabilityandthespectralstabilityofthestandingpulsesolutions)andEvansfunctionstoaccomplishtheexistenceandinstabilityofstandingpulsesolutionsofthenonlinearsystemofreactiondiffusionequationsandthenonlinearscalarreactiondiffusionequations.TheEvansfunctionsforthestandingpulsesolutionsareconstructedexplicitly.

简介：dichloro-methoxybenzenes的合成和动力学在353383K的一个温度范围从1,2,4-trichlorobenzene和钠甲氧化物被学习。反应物，溶剂和反应温度的臼齿的比率的效果被调查。反应产品包括三异构体。为三异构体的选择的顺序是1,4-dichloro-2-methoxybenzene>>2,4-dichloro-1-methoxybenzene>1,2-dichloro-4-methoxybenzene。为在1,2,4-trichlorobenzene和钠甲氧化物之间的平行液体固体接口反应的运动方程当催化剂不在时被建立。象pre指数的因素和激活精力那样的运动参数与Arrhenius方程被决定。

简介：InthispapermethodsofdifferentialinequalitiesandLiapunovfunctionalsforprovingtheglobalstabilityofconstantequilibriaofreaction-diffusionsystemsaregiven,andexamplesforshowinghowtousethesemethodsarealsogiven.

简介：

简介：

简介：Theoneplusone(1+1)modeofhydrosilationreactionofladderlikecis-isotaticpolyallylsilsesquioxane(AllyI-T)andpolyhydrosilsesquioxane(H-T)usingdicyclopentadienylplatinumdichloride(Cp2PtCl2)asthecatalystleadstotheformationofanewpolyorganosiloxane(POS).ThepresenceofnanoscaletubularstructureintheproductPOSwaspreliminarilyprovedbyIR,1H-NMR,differentialscanningcalorimetry(DSC),X-raydiffraction(XRD),gelpermeationchromatography(GPC),atomicforcemicroscopy(AFM)andmolecularsimulation.

简介：

简介：Ｓｔｕｄｙ　ｏｆ　Ｆｕｓｉｏｎ　ｗｉｔｈ　Ｂｉｎａｒｙ　Ｐｒｏｃｅｓｓ　ｉｎ　１６Ｏ＋４５Ｓｃ　ＲｅａｃｔｉｏｎＳｔｕｄｙｏｆＦｕｓｉｏｎｗｉｔｈＢｉｎａｒｙＰｒｏｃｅｓｓｉｎ１６Ｏ＋４５ＳｃＲｅａｃｔｉｏｎ￥ＷａｎｇＳｈｕｆａｎ...

简介：这份报纸与时间延期为一个人口动力学模型涉及旅行波前的稳定性。联合加权的精力方法和比较原则，noncritical旅行波前的全球指数的稳定性(有速度c的波浪>c=c*是最小的速度的c*,)被建立，什么时候在波前附近的起始的不安作为x在空间指数地腐烂到零，但是它能被允许任意在其它大地点，改进结果在，9，18，21]。

简介：ExactquantumcalculationsofreactionprobabilitieshavebeencarriedoutusinghypersphericalcoordinatesforthecollinearrreactionO+HCl(v<1)-OH(v’<1)+Cl.AgeneralizedLEPSpotentialenergysurfacewithabarrierheightof8.12kcal/molhasbeenusedinthecalculations.Accordingtothecalculatedresultswefoundthat(1)thereactionprobabilityoscillateswithenergy,(2)thereactionprobabilityshowsvibrationaladiabaticity,althoughitispoorerthanthatforsymmetricreactionCl+HC1.Theanalysisofresonancehasalsobeendone.ThereactionrateconstantsandaveragecrosssectionshavebeencalculatedbyTST-CEQmethod.TherateconstantsareinagreementwiththatbyQCTandsmallerthantheexperimentalone.Finally,thethresholdhasbeenestimatedandisingoodagreementwiththatoftheliterature.

简介：

简介：密度功能的计算被执行了比较地调查Au(I)的二条可能的小径有炔属羟的-ketoesters的催化Conia-ene反应。我们的研究发现在trifluoromethanesulfonate(TfO)的帮助下面，-ketoester是很可能为II建模经历到isomerize进它的enol形式，TfO通过一个6成员戒指转变状态在起一个质子转移作用。到炔属羟三元组契约的Au(I)催化剂的协作能提高eletrophilic能力和炔属羟一半的反应活动，它在炔属羟一半上触发enol一半的亲核的增加给vinyl-Au中介。这cycloisomerizaion步是由有56.0kJ/mol的一个精力障碍的21.3kJ/mol的exothermal。在整个催化过程，vinyl-Au的protonation是几乎自发的，并且enol的形成是限制率的步。enol的产生和炔属羟上的Au(I)催化剂的激活是Conia-ene反应能处于温和状况发生的关键原因。Au(I)催化的这些计算支持有炔属羟的-ketoesters的Conia-ene反应通过2由Toste建议了的小径。

简介：用ＥＤＴＡ可增强Ｆｅ２＋催化鲁米诺与溶解氧的发光反应，将ＥＤＴＡ加入鲁米诺溶液中可使流动注射分析测亚铁的检出限降低约１６０倍。在流动注射分析的试样分流路中使用新型的锌镀铜微还原柱，可同时测定Ｆｅ２＋和Ｆｅ３＋。该微还原柱可至少测定３０００个试样。测定Ｆｅ２＋和Ｆｅ３＋的线性范围是１×１０９～１×１０５ｍｏｌ·Ｌ１，检出限分别为２．７×１０１０和３．５×１０１０ｍｏｌ·Ｌ１，测定试样的速率为６０ｈ１。Ｃｒ３＋和Ｃｏ２＋有干扰。测定混合物中的Ｆｅ２＋和Ｆｅ３＋获得满意结果，测试样的结果同标准的分光光度法结果一致。实验表明，ＥＤＴＡ起增强剂的作用，Ｆｅ２＋是催化剂，而溶解氧是氧化剂。对反应机理进行了讨论。

简介：

简介：Quinolinederivativeswereefficientlypreparedthroughacid-catalyzedFriedlanderreactioninionicliquid([bmim][BF4]).Itisshownthattheproposedmethodisoperationallysimpleandenvironmentallybenigninthatthereactionmediaandthecatalystcanberecoveredandbereusedeffectivelyforatleastfourtimes.

简介：Thispaperisconcernedwiththeglobalexponentialstabilityoftimeperiodictravelingfrontsofreaction-advection-diffusionequationswithtimeperiodicbistablenonlinearityininfinitecylinders.Itiswellknownthatsuchtravelingfrontsexistandareasymptoticallystable.Inthispaper,wefurthershowthatsuchfrontsaregloballyexponentiallystable.Themaindifficultyistoconstructappropriatesupersolutionsandsubsolutions.