简介:TheRamanspectraof3%(molefraction)Y2O3-ZrO2(3Y)areobtainedatdifferenttemperaturefrom77Kto853K.Theresultsshowthat260cm-1Egand460cm-1Egmodesonthespectrashifttowardlowerwavenumberwiththeincreaseoftemperature;meanwhile,thecontinuityoftheHalfWidthatHalfMaximum(HWHM)andwavenumber(frequency)ofRamanbandsarebrokenandt-phaseonlypartiallytransformstom-phaseat523K.Basedontheexperimentalresults,thispaperdiscussesthet-phaselatticevibrationof3YandpresentstheimagesofvibrationdisplacementofsixRaman-activemodesfort-phaseofZrO2.TheanalysisindicatesthattherearediversitiesexistinginthedisplacementoftheatomicvibrationofRaman-activemodesbecauseoftheirdifferentsymmetriesatvarioustemperature,whichleadstothedifferentchangetendenciesofRamanbands.Furthermore,theabruptchangesofsomeRaman-activemodesindicatingtheatomicdisplacementareassumedtobethecondensationsofphononmodesinthet→mphasetransition.
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简介:MgO-Al2O3-Cr2O3rammingmixesmadeofdifferentrawmaterialshavedifferentmineralstructureanddifferentphysicalpropertiesthoughwiththeidenticalparticlesizedistribution,thesameamountofbinderandchemicalcomposition.Theresidualcarboncontentofthefusedmagnesia-chromematerialmadeinreducingatmosphereisveryhigh,ifthismaterialsisusedintheMgO-Al2O3-Cr2O3rammingmix,itwouldcausespallingofthefurnaceliningduringdrying-out.
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:HighactiveandstablegoldcatalystssupportedoncrystallineFe2O3andCeO2/Fe2O3werepreparedviathedeposition-precipitationmethod.ThecatalystwithaAuloadof1.0%calcinedat180°CshowedaCOconversionof100%at-8.9°C,whileAu/CeO2/Fe2O3convertedCOcompletelyat-16.1°C.Evenhavingbeencalcinedat500°C,Au/Fe2O3stillexhibitedsignificantcatalyticactivity,achievingfullconversionofCOat61.6°C.ThecatalystwithalowAuloadof0.5%couldconvertCOcompletelyatroomtemperatureandkepttheactivityunchangedforatleast150h.N2adsorption-desorptionmeasurementsshowthatthecrystallinesupportspossessedahighspecificsurfaceareaofabout200m2/g.CharacterizationsofX-raydiffractionandtransmissionelectronmicroscopyindicatethatgoldspecieswerehighlydispersedasnanoorsub-nanoparticlesonthesupports.Evenafterthecatalystwascalcinedat500°C,theAuparticlesremainedinanano-sizeofabout6―10nm.X-rayphotoelectronspectrarevealthatthesupportedAuexistedinmetallicstateAu0.ThemodificationofAu/Fe2O3byCeO2provedtobebeneficialtotheinhibitionofcrystallizationofFe2O3andthestabilizationofgoldparticlesindispersedstate,consequentlypromotingcatalyticactivity.
简介:以便得到TiB2-Al2O3的同质的混合物和协议,一个表面修正方法被用来准备nano规模的杂交Al2O3涂的TiB2粒子。PE蜡粒子是第一到由杂交,然后nano规模Al2O3粒子的TiB2粒子上涂又是涂的到由PE蜡粒子涂的TiB2的表面上。SEM,TEM和版本被用来描绘同样收到的核心/壳粒子和它的协议的微观结构。试验性的结果显示出那粒子规模TiB2和Al2O3的同质的分散能不仅在混合粉末而且在使脱蜡的协议被形成。协议当时是由煤气压的sintering(GPS)的sintered。物件顶端的装饰物产品显示出与参考样品由正常方法制作了作比较的改进技工性质。
简介:Inthispaper,varioustechniquesincludingBET,XRD,SEMandXPSwereusedtostudythesinteringofpureandLa2O3-dopedtitania.Theexperimentalresultsshowthatsinteringoftitaniaproceedsviavolumediffu-sion.Addingoflanthanumoxidedecreasestherateofsinteringandhindersthephasetransitionfromanatasetorutilecrystalbystrongsurfaceinteractionbetweenthemixedcrystals(La4Ti9O24,La0.66TiO2.99)andTiO2.
简介:<正>卡佩罗终于驾临皇马了,这个当年在伯纳乌球迷嘘声中下课的冠军教练竟然成为百年皇马走出困境的最大希望。和当年离开罗马时一样,卡佩罗带来了自己战术体系中最重要的球员——埃莫森。失去马克莱莱被认为是皇马转会市场上最大的失误所在,皇马高层由于吝啬法国人的加薪要求而不得不花巨资寻求其替代者,可问题的结症在于无论是格拉维森还是加西亚都无法给予后防线足够的保护。穆里尼奥在获得巴拉克和舍瓦后完全没有表现出想像中的喜悦,相反社区盾杯的失利让他还在为中场布置而伤神。最近几年,4-2-3-1双后腰阵形在欧洲几大豪门间相继流行起来,而传统的4-4-2两翼齐飞却不断受到冷落,连边路之王
简介:【内容摘要】本 课题 是对近两年来我校课改中的优化探究型课堂中小组合 学 学习方式的一次 创新 ,对小组合学提出了三个层面的优化策略。本文 详细 阐述 小组 合学设计上优化措施:知一项原则——(问题的设置要明确三点: 合学 的触摸点, 合学 的聚焦点,同伴合学的连接点),定两条定律(以探究为基础,以思维为中心),行三序合一。
简介:XunwuRareEarthCorporationhasintroducedP507reductionextractionprocessfromAnhuiRe-searchInstituteofMetallurgytoprepareeuropiumoxideoffluorescentgradeinonestep.Theprocesshasbeenemployedinaproductionlineinthecorpo-ration.Andafterthreemonthsindustrialexperi-ment,allthetechnicalindexesreachedthedesigned