简介:新对光反应变色bisphenoxynaphthacenequinone混合物,6,6素数-[1-methylethylidenebis(4,1-phenyleneoxy)]二度(5,12-naphthacenequinone)(1),被一个二拍子的圆舞方法综合,即,6的合成[4-(2-(4-hydroxyphenyl)异丙基)含苯氧基)从6-chloro-5的-5,12-naphthacenequinone(2),12-naphthacenequinone(3)和bisphenol--A,和在DMF/丙酮的化合物2的进一步的反应面对无水的碳酸钾和碘化钾混合了溶剂。粗略的产品在一种precipitate形式被获得并且能被再结晶容易净化。溶剂作文在第二步在猛抛的粗略的产品的收益上标记影响。(编辑作者摘要)3个裁判员。
简介:Afamilyofunconditionallystabledirectintegrationalgorithmwithcontrollablenumericaldissipationsisproposed.Thenumericalpropertiesofthenewalgorithmsarecontrolledbythreeparametersα,βandγ.Bytheconsistentandstabilityanalysis,theproposedalgorithmsachievethesecond-orderaccuracyandareunconditionallystableundertheconditionthatα≥-0.5,β≤0.5andγ≥-(1+α)/2.Comparedwithotherunconditionallystablealgorithms,suchasChang’salgorithmsandCRalgorithm,theproposedalgorithmsarefoundtobesuperiorintermsofthecontrollablenumericaldampingratios.Theunconditionalstabilityandnumericaldampingratiosoftheproposedalgorithmsareexaminedbythreenumericalexamples.Theresultsdemonstratethattheproposedalgorithmshaveasuperiorperformanceandcanbeusedexpedientlyinsolvinglinearelasticdynamicsproblems.
简介:Inthispaper,analmostP-stabletwo-stepsixth-orderHybridmethodwithphase-lagoforderinfinityandaclassexpliciteighth-orderObreckoffmethodswithphase-lagoforder10-24aredevelopedforthenumericalintegrationofthespecialsecond-orderperiodicinitial-valueproblems.Thesemethodshavetheadvantageofhigheralgebraicorderandconsiderablysmallerphase-tagcomparedwithsomemethodsin[1-6].Numericalexamplesindicatethatthesenewmethodsaremoreaccuratethanmethodsdevelopedby[1-6].
简介:Inthisstudy,atwo-stepheatingprocessisintroducedfortransientliquidphase(TLP)diffusionbondingforsoundjointswithT91heatresistantsteels.Atfirst,ashort-timehighertemperatureheatingstepisaddressedtomelttheinterlayer,followedbythesecondsteptocompleteisothermalsolidificationatalowtemperature.Themostcriticalfeatureofournewmethodisproducinganon-planarinterfaceattheT91heatresistantsteelsjoint.WeproposeatransitionalliquidphasebondingofT91heatresistantsteelsbythisapproach.Sincejointmicrostructureshavebeenstudied,wetestedthetensilestrengthtoassessjointmechanicalproperty.Theresultindicatesthatthesolidifiedbondmaycontainaprimarysolid-solution,similarcompositiontotheparentmetalandfreefromprecipitates.Jointtensilestrengthofthejointisnotlowerthanparentmaterials.Jointbend'sstrengthsareenhancedduetothehighermetal-to-metaljunctionproducinganon-planarbondlines.Nevertheless,thetraditionaltransientliquidphasediffusionbondingproducesplanarones.Bondingparametersofnewprocessare1260℃for0.5minand1230℃for4min.
简介:Anewtechnology,thetwo-steptransientliquidphasediffusionbonding(TLP-DB)technologyforcobalt-basedK640superalloy,wasinvestigated.Themethodconsistsofashort-timehightemperatureheatingtomeltinterlayerfollowedbyisothermalsolidificationofliquidphaseatalowertemperaturethanthatoftheconventionalTLP-DB.Theresultindicatesthatthetwo-stepTLP-DBcanreliablyproduceanidealjointwithuniformchemicalcomposition,whichissuperiortothejointweldedbyconventionalTLP-DBinmicrostructureandmechanicalproperties.Bondingparametersofnewprocessare1250℃for0.5hand1180℃for3h.Thehigh-temperaturetensilestrengthofthejointbytwo-stepTLP-DBreaches74%ofthatofthebasematerialonanequalbasis,butthehigh-temperaturetensilestrengthofthejointbyconventionalTLP-DBisonly58%ofthatofthebasematerial.
简介:Thesatelliteremotesensinghasbecomeapromisingtechniquefordetectingearthquakeandfaultactivities.Butitisstillverydifficulttoexactlyextracttheearthquakeanomalyfromthecomplicatedremotesensinginformation.Thispaperpresentedatwo-stepmethodtoextracttheseismicmicrowaveradiationanomalyrelatedwithearthquake,whichcouldeliminatethestableinfluenceofgeography,terrain,coversphereandseasons,aswellastherandominfluenceofweather.Furthermorethetwo-stepmethodwasappliedtoanalyzetheanomalyofWenchuanearthquakebasedonthedataofAMSR-E.Microwaveradiationanomalieswereeffectivelydetectedrelatedtothemainshockandaftershocks.Theextractedmicrowaveradiationvariationshowedgeneralfeaturesofthree-stage:thepositiveradiationanomalyappearedaroundtheepicenterinthefirststage,quietvariationinthesecondstage,andabnormalareagraduallymovedtotheepicenterinthethirdstage.AfterthemainshockthemicrowaveradiationanomaliesdistributedalongtheLongmenshanfaults,andtheepicentersofaftershockswerecoincidentwiththeanomalyareainspace.
简介:基于镍的复合的层被阳极化在五分钱板上准备在一75?wt%H3PO4答案包含NH4F。这层然后被galvanostatic控告/解除(GCD)对待直到黑外部层被分开,留下象为supercapacitors的没有文件夹的电极材料的镍板上的一部电影。这部电影由Ni组成的微结构描述表演(哦)2和NiO,和没有氟化物在同样获得的电影被发现。电气化学的测试证明这个没有氟化物的电影电极展出954的一个高电容?F圆形的二色性(CD)系列和polyacrylamide胶化电气泳动(页)。当聚合物支架和金属建筑群作为催化活跃中心工作了,BSA服务了。当到BSA的转变金属离子建筑群的有约束力的比率是5:1时,结果证明BSA的结构仍然保持未改变。而且,清除superoxide一??
简介:在这篇论文,为解决单个延期的二拍子的圆舞连续性Runge-Kutta(TSCRK)方法的一个班微分方程(DDE)被介绍。方法被给的这的数字稳定性的分析。我们考虑二个不同盒子:(ⅰ)τ≥h,(ⅱ)τ
简介:在原处,有在硅石矩阵的柳酸(柳安)的铽建筑群的合成被一个二拍子的圆舞大音阶的第五音胶化过程做。有柳酸的铽建筑群在大音阶的第五音胶化被形成导出硅石胶化,并且由光刺激系列证实了并且红外线(红外)系列。作为与纯铽建筑群粉末相比,包含铽建筑群的硅石胶化展出它的典型排放并且为纯建筑群比那介绍更长的荧光一生。复杂包含硅石胶化的光性质被调查,与那些相比,两个,铽做了硅石胶化和纯复杂粉末。导致上述结果的原因也被讨论。(编辑作者摘要)7个裁判员。
简介:Temperature-dependentphotoluminescencecharacteristicsoforganic-inorganichalideperovskiteCH3NH3PbI3-xClxfilmspreparedusingatwo-stepmethodonZnO/FTOsubstrateswereinvestigated.Surfacemorphologyandabsorptioncharacteristicsofthefilmswerealsostudied.Scanningelectronmicroscopyrevealedlargecrystalsandsubstratecoverage.Theorthorhombic-to-tetragonalphasetransitiontemperaturewas140K.Thefilms’excitonbindingenergywas77.6±10.9meVandtheenergyofopticalphononswas38.8±2.5meV.TheseresultssuggestthatperovskiteCH3NH3PbI3-xClxfilmshaveexcellentoptoelectroniccharacteristicswhichfurthersuggeststheirpotentialusageinperovskitebasedoptoelectronicdevices.
简介:Thispaperpresentsatwo-stepexplicitmethodoforderfourforsolvingaclassoflinearperiodicinitialvalueproblems.Ateachcomputationalstep,onlytworightfunctionevaluationsandonederivativeevaluationareemployed.Basingonaspecialvectoroperation,themethodcanbeextendedtothevector-applicableinmulti-dimensionalspace.
简介:Weintroduceaone-stepimplicititerativemethodfortwofinitefamiliesofasymp-toticallynonexpansivemappingsinahyperbolicspaceanduseittoapproximatecommonfixedpointsofthesefamilies.Theresultspresentedinthispaperarenewinthesettingofhyperbolicspaces.Ontop,thesearegeneralizationsofseveralresultsinliteraturefromBanachspacestohyperbolicspaces.Attheendofthepaper,wegiveanexampletovalidateourresults.