简介:1IntroductionTherareearthcobaltalloyshavethepotentialformakingthemagneticandmagnetoopticalmaterials.Sofar,therareearthcobaltalloyfilmsaresubstantiallyproducedbysputteringorvacuumplating.Ifsuchfilmsarepreparedbyelectrodepositioninstead,productionefficiencywouldbeimprovedandthecompositionofthealloycouldbecontrolled.Becausetheoxidationreductionpotentialsofrareearthelementsareverynegative,organicsolventsmaybeusedaselectrolyticmedia.ElectrodepositionofGdCoandSmCoinorganicsolutionshasbeenreporte...
简介:[Co3(1,2-S2C6H4)3(PPh3)3][CoBr3(DMF)].sol(1,sol=CHCl3,O(C2H5)2,H2O)wasobtainedfromthereactionofCoBr(PPh3)3withNa2(S2C6H4)inchloroform.TheCo3coreinthecationof1exhibitsametal-metalbondedisoscelestriangle,inwhichthetwolongerCo-CobondsarebothbridgedbyS2C6H4ligandsontwosidesofthetriangleplanerespectively,whilethebottomshortCo-CobondisbridgedbythethirdbidentateS2C6H4ligand.Aseriesofpolynu-clearcobaltclustercompoundswithphosphine,thiolateand/orsulphurligandswerepreparedbylowoxidationstateCo+withthiolatesinorganicsolvents.Thesetri-,tetra-,hexa-,heptanuclearclustercompounds1-8withvarioustypesofcrystalstructurescanbeviewedasthecondensedpolynuclearcobaltcomplexesthatthecobaltatomframeworkswithsulphurbridgedwerebuiltthroughthesmalltriangularunitsof[Co3S3nL3](n=1,2)withorwithout[CoL](L=PR3,Br,Cl,5-C5H5)fragments.
简介:采用密度泛函B3LYP/6-311G(d,p)方法对CH3F与C2H3的反应体系进行了理论研究,获得了反应的势能面信息及可能的微观机理.在QCISD(T)/6-311++G(d,p)水平上精确计算了各反应物种的单点能.结果表明,除抽提氢反应外,标题反应还存在抽提氟(R1)、消氟化氢(R2)、消氢(R3)和自由基形成(R4)四类反应.在QCISD(T)/6-311++G(d,p)//B3LYP/6-311G(d,p)水平上,R1,R2,R3和R4反应的能垒分别是163.9,152.2,209.8和224.2kJ·mol-1,相应反应能为-56.6,-164.3,-2.7和-156.0kJ·mol-1,所有反应均放热,为热力学允许的反应.
简介:Catalyticcombustionofpropane-airmixturewasinvestigated.Platinumcatalystsoveraflatstainlesssteelwithγ-aluminawashcoatwereemployed.Theemployedburnerhasthreecatalystssetparalleltothemixtureflow,spacedatanintervalof5,10and15mm.Bothexperimentandnumericalsimulationweremadeatinlettemperatureof553K,inletvelocityof3to7m/sandequivalenceratioof0.3to0.5.Inthenumericalsimulation,two-dimensional,steadystatemodelwasdevelopedtocalculatethetemperatureandspeciesconcentrationingas-phase.Inthismodel.chemicalreactiononthecatalystsurfaceandthatinthegasphasewereassumedtooccurinthree-steps.Thenumericalresultsshowgoodagreementwithexperimentalresults.Itwasfoundthatthepropertiesofthecatalyststronglyaffectthecatalystsurfacetemperature.Especially,thethermalconductivityofcatalysthasagreateffect,whiletheemissivityofcatalysthaslesseffect.
简介:Tris)(η5-cyclopentadienyl-μ-carbonyl-iron)-μ3-nitrosylclusterwasobtainedfromthereactionofcyclopentadienyldicarbonylirondimerwithnitrogenmonoxideinxylene.Theclusterwascharacterizedbyelementalanalyses,IR,MSand1HNMR.Thecrystalstructureof[(η5-C5H5)(μ-CO)Fe]3(μ3-NO).C4H8OwasdeterminedbyX-raydiffractionanalysis.ItcrystallizesintheorthorhombicspacegroupPnma,a=9.053(2),6=10.545(2),c=22.525(4)A,V=2150.3(7)A3,Z=4,Dc=1.68g.cm-3;structuresolutionandrefinementbasedon1141reflectionswithI>3.0(I)(MoKa,A=0.71073A)convergedatR=0.0540.Theinfraredabsorptionbandat1325cm-1oftheμ3-NOinthecluster,whichisredshifted,showsthatμ3-NOisactivated.
简介:目的对2HRZE/4H3R3和2H3R3Z3E3/4H3R3治疗初治涂阳肺结核病患者社会效果评价,为结核病的社会控制提供依据。方法应用中国卫生部结核病控制项目2HRZE/4H3R3方案,治疗初治涂阳肺结核病人的监测资料和2003年对《中国结核病控制规划(2001—2010)))阶段评估,抽查“世界银行贷款+中国结核病控制项目”2H3R3Z3E3/4H3R3方案治疗初治涂阳肺结核病人治疗的资料进行分析。结果在落实较好的全程督导服药治疗下,两方案已达到国家规划目标。目前2H3R3Z3E3/4H3R3未能达到国家规划目标,治愈率明显较强化期每日服药方案低,而失败率、丢失率、副反应停药率明显较高。结论经费落实不到位导致患者全程督导服药治疗不能很好落实,是影响化疗效果的主要原因。由于全程督导服药治疗不能很好落实,致使全程隔日服药方案不能胜任规划目标的要求,提示结核病控制的方向。
简介:摘要目的探究2H3R3Z3E3/4H3R3化疗方案在肺结核治疗、预后方面的应用效果。方法选取我院2012年6月-2014年6月期间收治的肺结核患者90例,根据患者年龄随机分成三组,即青年组、中年组及老年组,分别为30例,三组患者均给予2H3R3Z3E3/4H3R3化疗方案,观察比较三组患者的痰转阴率、病灶吸收率及不良反应发生率。结果青年组和中年组患者的痰菌转阴率及空洞吸收率明显高于老年组(P<0.05),但青年组和中年组比较无统计学意义(P>0.05);老年组患者的不良反应发生率明显高于青年组和中年组(P<0.05),但青年组和中年组比较无统计学意义(P>0.05)。结论对肺结核患者应用2H3R3Z3E3/4H3R3化疗方案治疗效果显著,安全性也较高,但对于老年患者应注意观察。
简介:摘要:本教学设计案例围绕 预备单元(Starter Unit 3What color is it ? )展开。通过复习句型(What’s this/that? It’s an apple. What color is it? t’s red. Spell it ,please.It’s red)谈论物体颜色学习语法(an/a/the),同时训练学生听,说的能力 .本教学设计依据新课程标准要求,通过希沃游戏,大转盘游戏激发学生学习兴趣,采用图片直观教学法, 通过师生练习,小组练习,双人练习呈现新句型(It’s a red apple.The apple is red.),让学生观察发现总结 规律学习语法。通过完成听力任务培养学生抓住关键词寻找答案的听力技能,培养学生好的听力习惯 。同时以教材为本,结合实际,采用小组合作表演培养学生的口语技能和初步写作能力。本教学案例教学手段多样,使用希沃游戏教学,大转盘游戏,图片插入直观教学,图片裁剪,多媒体希沃白版5手机拍照视频上传,音乐剪辑插入播放等多种信息技术教学手段提高学生学习兴趣,调动学生积极性, 尽力让学生全体参与。教学过程中贯穿课程思政的理念,作业设计注重学生能力的培养。