简介：该文筒述了管线钢的市场状况，X60、X65、X70技术要求，生产难点、工艺流程，酒钢生产设备、前期开发情况，对洒钢开发管线钢X60、X65、X70板卷的可行性进行了分析。

简介：虽然来势凶猛的SARS暂时隐退，但它的阴影仍未完全消除。谈起这场瘟疫，人们仍心有余悸，有媒体报道，SARS仍会再次“光临”。迄今为止，仍没有抗SARS病毒传染病的特效药。为此，科学家正在实验室中展开抗SARS大战，也许不久之后，我们再面对SARS时，不再恐慌畏惧。

简介：(Y,Gd)BxV1-xO4-x:Eu3+phosphorswerepreparedbysolidstatereaction.Theredemissioncolorpurityof(Y,Gd)BxV1-xO4-x:Eu3+phosphorismuchbetterthanthatoftherecentwidely-usedcommercialredemittingphosphor(Y,Gd)BO3:Eu3+anditsrelativeemissionintensityis84%ofthecommercialphosphor(Y,Gd)BO3:Eu3+.Itisexpectedthat(Y,Gd)BxV1-xO4:Eu3+phosphorwillbeapromisingcandidateforPDP(plasmadisplaypanels)application.

简介：采用玻璃化试剂，于铂黄坩埚中，在高温下熔融金川高锍，冷却成形，实现了金川高锍中镍、钴、铜、铁的Ｘ－荧光测定。

简介：采用Ｘ射线荧光光谱法测定新疆高冰镍中铁、钴，加入适量的助碎剂，利用基体中其它元素参与校正，实现了未知样品的测定。

简介：目的:对支气管扩张的X线平片及CT做一对比分析。方法:取病理证实支扩40例,分别摄胸部平片,常规CT扫描。结果:显示X线平片漏诊率高(16/40),诊断率低(6/40)。结论:常规CT较X线平片显示率高。

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简介：ThemeasurementsoftemperaturedependenceofthemagneticsusceptibilityofLa1-xSrxCoO3perovskiteoxidesatdifferentSrdoping(0≤x≤0.5)andannealingtemperaturewerepresented.Forthesamplewithx=0.1,ashoulderwasobservedaround150K,andapeakwhichisonefeatureofspinglassappearedaround50Kinthecurveofsusceptibilityversustemperature.Thehigh-temperature(250～420K)susceptibilityfitswellwithCurie-Weisslawforallsamples.WeissconstantandeffectivemagneticmomentweredeterminedandtheirvariationswithSrdopingandoxygenannealingconditionwereobtained.TheWeissconstantincreasesmonotonouslywithSrcontentforx>0.2.Thevaluesofeffectivemomentswereinterpretedwiththespinstateofcobaltions.Studiesonthesusceptibilitiesofthesampleswithx=0.2underdifferentpreparationtemperaturesandannealingtemperaturesshowthattherisingofsinteringtemperatureandannealingtemperaturewillincreasethepara-ferromagnetictransitiontemperature,andreducetheeffectivemomenttonormalvalue.OurresultshowsthatbothCo3+andCo4+ionsshouldbeinISstateafterannealingandtheoxygenannealingcausesthetransitionofCo3+spinstatefromHStoIS.

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简介：锅炉省煤器磨损一直是困绕锅炉稳定运行的主要因素之一.本文介绍了Km高温抗蚀耐磨涂料的性能、特点,以及在实际生产中的使用情况,通过实践充分肯定了Km高温抗蚀耐磨涂料的可行性、可靠性和经济性.

简介：使用X—荧光光谱仪,采用H3PO4等溶解试样,Co作内标,压片法制备样品,偏最小二乘法校正处理数据,测定铁矿石中的TFe、CaO、MgO、SiO2、MnO2、Al2O3方法的精密度较好,各组分的RSD（n=10）=1.81%～4.50%,准确度也较高。适用于铁矿石日常分析。

简介：总结了能量色散型x荧光分析仪测定高炉渣的取样、制样、分析方法，试验了相关分析条件，测定了部分高炉渣样品，取得了较为满意的效果，为钢铁企业炼铁化验室分析手段的更新换代做了有益的探索。

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.

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简介：ThemagneticpropertiesandthephasestructureofTb1-xPrxFe1.96(x=0,0.1,...,0.7)werestudied.ItisfoundthatthesaturationmagnetizationoneasyaxisisdecreasedwithincreaseofPrcon-tent,from77.24Am^2·kg^-1forx=0,reducestominimumvalueof11.84Am^2·kg^-1forx=0.5,andreturnesto37.14Am^2·kg^-1forx=0.7.Thenon-cu-bicphasesappearbeyondx=0.2andthematrixchangesfrom1:2phaseforx=0to1:3phaseforx=0.4,atlastto2:17phaseforx=0.7.Thecom-poundsstructurewouldturnmorecomplexasthePrcontentincreases.

简介：通过测定进口的C1720HT态铍铜合金以及国产QBe2CY铍铜合金时效后的弯曲应力松弛性能，并对应力松弛性能曲线进行了拟合和外推。根据拟合曲线和外推到1000h后的应力松弛极限可以看出，C1720HT态铍铜合金的抗应力松弛性能明显优于国产铍铜合金。从定点金相中看出，C1720HT组织明显均匀，晶粒尺寸大多数在15－45μm之间。另外，还研究了添加Co以及不连续析出、温度等对应力松弛性能的影响。

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：通过对亚硫酸钠工艺和SUPCONJX－300X集散系统结构的介绍，论述控制难点及组态、调试过程中需注意的问题。

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.