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简介：用滚镀的方法在金刚石表面镀Ni层和纳米Si3N4/Ni复合镀层,用扫描电子显微镜观察金刚石镀前和镀后的表面形貌,用DKY-1型单颗粒抗压强度测定仪测量金刚石单颗粒的抗压强度。用热压烧结的方法得到铁基结合剂金刚石节块,在INSTRON-5569型万能材料试验机上测量节块的抗弯强度,在NMW-1立式万能摩擦磨损试验机上测试节块的耐磨性。结果表明：在金刚石表面镀Ni层和纳米Si3N4/Ni复合镀层后,表面镀层均匀,纳米Si3N4/Ni复合镀层比纯Ni层更致密,更平滑,晶粒更细小;纳米Si3N4/Ni复合镀层金刚石单颗粒有更高的抗压强度;纳米Si3N4/Ni复合镀层金刚石铁基结合剂节块有更高的抗弯强度和更优良的耐磨性。

简介：主要介绍长钢一钢厂与武汉大西洋冶金工程技术有限公司合作，对小方坯连铸机进行高效化改造的情况，改造中采用了连续锥度结晶器、半板簧振动装置等，改造后效果显著。

简介：探讨了在大生产条件下4Cr5MoSiV1钢的脱碳层测定原则。结果表明,金相法测定结果较准确且操作简便

简介：德国最大的钢铁生产厂家蒂森克虏伯钢公司宣布钢材提价，幅度最大为100欧元／吨，从4月1日开始生效。提价的原因主要是原料成本上升，由于对市场前景展望是乐观的，该公司计划7月1日进一步提价。

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简介：Whitebody-color(Y,Gd)BxV1-xO4-x:Eu3+phosphorswerepreparedbycoprecipitationreaction.UnderVUVexcitationat147nm,theredemissioncolorimetricpurityof(Y,Gd)BxV1-xO4-x:Eu3+phosphorismuchbetterthanthatofcommercialPDP(plasmadisplaypanels)phosphor(Y,Gd)BO3:Eu3+.Butitsrelativeemissionintensityisonlyabout90%ofthecommercialphosphor.

简介：针对酒钢炼轧厂炼钢工序转炉投产以来4台鼓风机煤气回收仪控系统运行现状,结合实际工艺条件及控制过程出现的问题,对仪控系统提出优化及改进方案,降低了转炉风机运行故障,提高了转炉风机煤气回收率和系统的安全性,利于环保。

简介：据德国之声网站报道，中国承建的中缅天然气管道经过4年建设于6月3日竣工。

简介：ThesinglecrystalgrowthofstoichiometrichostluminescentcrystalNa5Eu（WO4）4hasbeeninvestigated.UsingNa2WO4asaflux,theoptimumconditionstogrowapuresinglecrystalbyflux-slow-coolingmethodhavebeendetermined.Ahighopticalqualitysinglecrystalofdimention4.5mmhasbeengrown,whichisthelargestoneasweknowsofar.Themicro-hardnessofNa5Eu（WO4）4singlecrystalis3.46×103MPa.Itsrefractiveindexis1.81inwhitelightwavelengthregionandthespecificgravityis5.65g/cm3.Thefluorescentandexcitationspectrahavebeendeterminedandthereasonofthefluorescentquenchof5D2and5D1to7FjofEu3+canbeexplainedasmulti-phononnon-radiationtransition.

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简介：Thecrackingandaromatizationofn-hexaneoverH-ZSM-5modifiedbyvariousrareearthswereinvestigatedbymeansofcontinuousflowmicro-reactor.ThesurfacepropertiesofmodifiedH-ZSM-5catalystswereobtainedfromIR,XRDandXPS.Theresultsshowthattherareearthsenhancethearomatizingpropertiesofthecatalystswhicharepreparedbymechanicalmixturemethod.Theresultsofn-hexanecrackingandaromatizationarecorrelatedwiththeacidity.TheBrnstedacidicsitesaretheactivesitesofn-hexanearomatization,whileLewisacidsiteplaysanimportantroleinn-hexanecracking.

简介：Silicawasused,asacatalystcarrier,toloadceroussulfateforcatalyzingthesynthesisofn-butylacetate.Themainpurposeofthisresearchwastoexplorethefeasibilityofsilicainimprovingthedecentralityandactivityofthecatalyst.Theeffectsofmolarratioofbutylalcoholtoaceticacid,theceroussulfateloadingsandthereactiontimeontheconversionofaceticacidwerestudiedbysinglefactorexperimentmethodandorthogonalexperimentmethodrespectively.Therefractiveindex(n20D)andmolecularstructureofthepreparedn-butylacetateweremeasuredbyAbbeRaefractometerandFourierTransformInfraredspectroscope,respectively.Thecomparisonsofthesilicaloadedandunloadedcatalystsforcatalyzingthesynthesisofn-butylacetateweremade.Theresultsshowedthatthesuitableconditionsforsynthesizingn-butylacetatewere:molarratioofbutylalcoholtoaceticacidof1.4∶1,uselevelofloadedceroussulfateof0.30gandreactiontimeof50min,respectively.Themaximumconversionofaceticacidforthesilicaloadedcatalystreached98.62%whichwas12.32%and16.43%higherthanthosefortheunloadedcatalystsreportedinliteratures,buttheuselevelofceroussulfatefortheformerwasmuchlessthanthoseforthelattersundersimilaroptimaltechnicalconditions.Thesilicawasprovedtobeagoodcatalystcarrierforenhancingdecentralityandactivityofthecatalystandincreasingtheconversionofaceticacid.Therepentanceofthesilicaloadedceroussulfatewasalsoinvestigatedintheexperiment.

简介：SeveralREEdatasetswerecollectedinCoreDD2andEC2005intheinnershelfofEastChinaSea,CoreY127inthenorthernOkinawaTrough,CoreNT1,C9247andC92169inthesouthYellowSeatochecktheapplicabilityoftheδEuN-ΣREEsmodelforquantita-tivelydistinguishingsedimentsfromtheYangtzeRiverandtheYellowRiver.Bycomparison,severalsedimentsincoresDD2,EC2005,Y127aregenerallyinaccordancewiththismodel.ThecoresNT1,C9247andC92169,whichhavebeeninfluencedbytheYangtzeRiverandtheYellowRivertogether,however,wereinconsistentwiththeδEuN-ΣREEsmodel.TheδEuN-ΣREEsplotanditscorrespondingregressionequation,whichcouldbeusedtodistinguishsediments＂intuitivelyandquantitatively＂fromtheYangtzeRiver,andtheYellowRivershouldbereconsideredorreassessed.

简介：通过合理的成分设计,采用洁净钢冶炼工艺、两阶段轧制技术、热处理生产技术,成功的研制出符合客户要求的正火态热处理管线钢。通过性能检验,产品晶粒细小、组织均匀、性能富裕量较大,完全可以满足用户大批量供货要求。

简介：二高度光的铕(III)和铽(III)的准备有succinimide(SI)和N-hydroxysuccinimide(NHSI)的建筑群被报导，它进一步通过元素的化学分析，热分析，英尺红外，粉末X光检查衍射，SEM和荧光光谱学被调查。通过这些分析收集的数据揭示了Eu(III)的形成，有上面的Tb(III)建筑群对ligand在金属提及ligands(M:L)1:3的臼齿的比率。光中心从photoluminescent系列调查被保留的关于通过lanthanide的协作地点的有效促进感受性的有趣的结论。当时，强壮的光排放在Eu(III)-SI和Tb(III)-NHSI建筑群的情况下被观察-SI建筑群展出了的相应Eu(III)-NHSI和Tb(III)没有相片光性质。最新获得的光lanthanide建筑群可能具有为在光电子的各种各样的应用的特别兴趣。

简介：ＳｐｅｃｔｒａｌＰａｒａｍｅｔｅｒＳｔｕｄｙｏｎＴｍ３＋ｉｎＮａ５Ｔｍ（ＷＯ４）４ＣｒｙｓｔａｌＹａｏＬｉａｎｚｅｎｇ（姚连增）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｒｉｎｇ，ＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅｎｃ...

简介：ThephotoluminescencepropertiesofBiTaO4∶Pr3+andBiTaO4atroomtemperaturewerestudied,andtheinfraredtransmissionanddiffusionreflectionspectraofBiTaO4weremeasured.ThephotoluminescencespectrumofBiTaO4peaksatabout420,440and465nm.Therehasanobviousexcitationbandfrom330to370nm.ThephotoluminescencespectrumofBiTaO4∶Pr3+consistsofthecharacteristicemissionofPr3+,anditsmainpeakisat606nmfrom3P0→3H6transitionofPr3+.Itsexcitationspectrumconsistsofthewidebandwithmaximumat325nm,thewidebandintherangeof375～430nm,andthecharacteristicexcitationofPr3+.Thebandsat325nmand375～430nmmaybefromtheabsorptionofthechargetransfertransitionofthetantalategroupanddefectenergylevelsinitsforbiddenband,respectively.ThereisenergytransferfromhosttoPr3+.BecauseboththehostdensityandphotoluminescencepeakintensityofBiTaO4∶Pr3+aresuperiortoPbWO4,BiTaO4∶Pr3+maybeapotentialheavyscintillator.

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