简介：NominalcompositionofCa1-xZnxTiO3:0.002Pr3+(x=0.000～0.200)phosphorswerepreparedbyconventionalsolidreactionroute.XRDandPLmeasurementswereusedtoinvestigatethesolid-solutionstructureandluminescencepropertiesofZn-dopedCa1-xZnxTiO3:0.002Pr3+phosphors.Theeffectofsolid-solutionstructureformedbysubstitutionbetweenCa2+andZn2+ionsontheluminescentpropertieswasanalyzed.Theresultsrevealthat,withtheincreaseofZnsubstitutioncontentbelow0.010,latticeparametersandtheintensityofexcitationpeakatboth260and330nmaswellasthecorresponding610nmemissionintensityaremonotonouslydecreasedquicklyinasimilartendency.Also,theevolutionofluminescenceintensityandcrystalcellparametersagainstZndopingconcentrationareingoodagreement.AboveresultsarecloselyrelatedwiththestructurechangewithinCa1-xZnxTiO3:0.002Pr3+solid-solutionphaseformedbytheZnionssubstitutionfortheCasites.Presentstudyrevealsthatthesolid-solutionstructureformedbysubstitutionbetweenCa2+andZn2+ionshassignificanteffectontheluminescencepropertiesofsinglephaseCa1-xZnxTiO3:0.002Pr3+phosphors.

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简介：微观结构和当演员组Mg-4.0Sm-1.0Ca合金的机械性质在由热挤出组成的thermomechanical处理期间被调查，滚动，并且在473K变老。Mg41Sm5阶段包含Ca和像针的Mg2在Mg矩阵形成的Ca阶段，和平均谷物尺寸和延伸是4.2m并且27%，分别地在热挤出以后，它在韧性暗示了增加。在滚动以后，另外，谷物尺寸进一步被精制，并且张力的力量增加了到293MPa。一新猛抛Mg3Sm在山峰Mg-4.0Sm-1.0Ca合金被发现，这合金显示了最好的机械性质，与83HV的山峰坚硬和313MPa的最终的张力的力量；这些性质被归因于谷物精炼加强，加强的稳固的答案，变硬的工作，并且降水加强。

简介：介绍了太钢7.63m焦炉煤调湿的工艺流程。煤调湿工艺是一种炼焦用煤的预处理技术,即通过炼焦煤在焦炉外的来自干熄焦余热锅炉的蒸气干燥来降低并稳定装炉煤的水分。装炉煤水分的降低能够提高焦炉生产能力、减少结焦所需热量消耗、提高焦炭质量、保证焦炉连续稳定操作,具有较大的经济效益和社会效益。

简介：AsystematicinvestigationofthemagneticandtransportpropertiesofTidopedLa0.67Ca0.33MnO3wasreported.TheTisubstitutionforMnionsresultsinareductioninferromagnetismandconductivity.Themetal-insulatortransitiontemperatureisclosetoCurietemperaturewhichdecreasesfrom274to82Kasxincreasesfrom0to0.17.ThemostimportanteffectofTidopingistointroducespinclustersinthesamplesduetothedistortionoflocallatticeandtheinhomogeneousmagneticstructureinducedprimarilybytherandomdistributionofMnions.Amaximummagnetoresistanceratioaslargeas90%in1Tat122Kwasobtainedforthesamplewithx=0.055,whichisfourtimeslargerthanthatobtainedforLCMOsampleat272K.Thereisaremarkablefield-historydependentMRinthecoolingprocessforthedopedsampleswhilesuchphenomenondisappearsinthewarmingrun.Theresistivityfollowswellthevariablerangehoppingbehaviorinparamagneticstate.Boththesizeeffectandspindependenthoppingofcarriersbetweenthespinclustersshouldbeconsideredinthissystem.

简介：由西南化工研究院与四川天科股份自主研制和设计的30000Nm3／h焦炉气甲烷化制压缩天然气工业装置，日前已在河北邯郸市裕泰燃气有限公司投产。这是我国首套焦炉气制压缩天然气装置，可实现年减排二氧化碳90万t、年产天然气1亿m3。该项目开辟了我国重污染工业废气制备清洁能源的新途径。

简介：8月3～4日，2012年中国人民银行分支行行长座谈会在北京召开。会议要求，人民银行系统要把党中央、国务院对经济形势的分析判断和下半年经济工作的决策部署学习好、贯彻好，把思想和行动统一到中央关于当前经济形势的判断和下半年经济工作的决策部署上来，

简介：ThetransportpropertieswerestudiedforrareearthmanganeseoxideLa0.67Cao.33Mn1-xFexO3(x=0-O.3)systems.ItisfoundthatwithincreasingFe^3+-dopingcontentx,theresistanceincreasesandtheinsulator-metaltransitiontemperature(T1M)shiftstolowertemperature.Ifthedopingcontentissmall,thetransportpropertiesmanifestmetalliccharacteristicsinthetemperaturerangeofT＜T1M,whiletheywillobeyathermalactivationmodelinthetemperaturerangeofT＞T1M.SuchabehaviormaybeattributedtotheFe^3+-dopingandpossibleMnionsscatteringtoelectrons.TheFe^3+dopingmayleadtotheformationofFe^3+-O^2--Mn^4+channels,whichcouldterminatethedoubleexchangeMn^3+-O^2--Mn^4+channels.TheantiferromagneticclustersofFeionsmayinducetheMnionstoscettertotheelectrons.

简介：针对煤气鼓风机轴封处泄漏煤气的现象,通过对轴封结构的分析研究和实验论证,将鼓风机的气封方式由自吸式密封改为高压氮气强制密封,取得了很好的效果,消除了风机房内CO浓度高的安全隐患。

简介：Ca8Mg(SiO4)4Cl2:Eu2+phosphordopedwithSr2+cationforCa2+partially,wassynthesizedbysolid-statereactionathightemperatureunderreducingatmosphere,anditsluminescentpropertieswereinvestigated.TheexperimentalresultsindicatethattheemissionintensityofthephosphorincreasesafterbeingdopedwithafewamountofSr2+ion.Theemissionpeakofthephosphorblueshifttoabout464nmwhenthephosphorisdopedwithlargequantityofSr2+ions.TheexcitationspectrumindicatesthatthephosphorcanbewellexcitedbyUVandbluelightfrom300to460nm,andthephosphorwasfittedwellfortheexcitationbyUVorblue-LED.

简介：工信部召开了产业转移指导目录编制工作座谈会。会议透露，产业转移指导目录有望在今年年底前完成。这一目录出台将进一步明确电解铝等有色金属产业转移方向。

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简介：Eu2+andDy3+codoped(Ca,Sr)7(SiO3)6Cl2yellowphosphorsweresuccessfullysynthesizedbyself-fluxmethod.Thestructure,morphologyandphotoluminescencepropertieswereinvestigatedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM)andphotoluminescencespectra.Theas-preparedphosphorshowedabroademissionspectrumcenteredat550nmforEu2+single-dopedphosphor,whilelocatedat548–544nmfortheEu2+,Dy3+codopedsamplesunderexcitationat380nmlight.TheemissionintensitywasgreatlyimprovedwhenDy3+wasdopedintothe(Ca,Sr)7(SiO3)6Cl2:Eu2+system.Thecomposition-optimizedsamplewith3mol.%ofDy3+andconstant10mol.%ofEu2+exhibiteda220%PLenhancementcomparedtothephosphorwith10mol.%Eu2+single-doped.Meanwhile,itwasfoundthatthequantumefficiencyofphosphornamely(Ca,Sr)7(SiO3)6Cl2:3mol.%Dy3+,10mol.%Eu2+couldgetupto24.6%.Thesynthesizedyellow-emitting(Ca,Sr)7(SiO3)6Cl2:Dy3+,Eu2+isapromisingcandidateashigh-efficiencyyellowphosphorforNUV-excitedwhiteLEDs.

简介：Duetotheremarkablemagnetoresistance(MR)effectonperovskite-typemanganite,magnetoelectronicsandspintronicshavebecomeattractivesubjectsofexperimentalandtheoreticalinvestigationsfortheapplicationpurpose.(La0.9Nd0.1)2/3Ca1/3Mn1-xFexO3(x=0,x=0.05)werepreparedsuccessfullybysol-gelmethod.Thestructure,magneticproperties,andtransportpropertiesofthecompoundswereinvestigated.Themagnetoresistanceeffectdependsonthecompositionandthetemperature.XRDpatternsshowthatthecompoundisasinglephasepolycrystalwithpseudocubicstructure.Alargenegativeisotropicmagnetoresistanceeffectinthesampleswereobservedatlowtemperatureregion.ThemaximumMRofthesampleswas77%and97%,respectively.Itwasmostlikelyduetothescatteringorthetunnelingtransportofspin-polarizedcarriersinlatticeunderstrongmagneticfield.

简介：介绍了气相法白炭黑的制备原理与生产工艺，通过解决生产过程中的技术难点及创新点，提高了白炭黑的产品质量，降低了生产成本，促进了资源的循环利用。

简介：分析了天然气管道发生泄漏、爆管等事故的原因，提出了相应的预防措施。

简介：在对SCR燃烧样气CO检测系统设备原理、结构性能消化吸收的基础上，借鉴国内先进经验，改进样气预处理部件技术，成功地解决了CO检测系统在液化气生产条件下，预处理单元脱水效果差所带来的分析仪进水等系统维护问题，实现了对SCR铜杆氧含量控制的稳定。并结合对CO检测系统的维护与实践，提出了对CO分析系统的维护要点。

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简介：针对气瓶钢30CrMoA坯料在用户验收过程中出现的低倍裂纹问题,从微观、轧向组织两方面展开缺陷分析。分析认为低倍的裂纹主要为火焰切割引起的应力裂纹,与材质没有关系。

简介：Awhitelong-lastingphosphorCa2MgSi2O7:Dy3+waspreparedbythesolid-statereaction.Astrongbandpeakedat260nmwasshownintheexcitationspectrumof578nmemission,whichmightbeattributedtotheoxygendeficiencyofthehost.Afterirradiatedwith254nmfor4min,thewhiteafterglowofthesamplecouldbeseenfor3h.Moreover,thedepthsandfrequencyfactorsoftrapcenterswerecal-culatedfromthethermo-luminescencecurveofthesample,whichindicatedthatthetrapcenterscorrespondingtothe414Kbandweremorehelpfultothelong-lastingphosphorescence.