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.

简介：针对某铜尾矿粒径较细，仅采用量筒装置无法准确模拟尾矿的沉降隋况。通过直径1m的半工业浓密试验机对铜尾矿进行浓密试验，研究了单位面积处理量对溢流水固含量的影响，泥层高度对底流浓度的影响，得出了最佳试验参数，为深锥浓密机选型提供了参考依据。

简介：介绍了长钢半连续棒材生产线以开发φ8mm新产品为目标实现150×150mm连铸坯—火成材的配套工艺改造,采用了国内外同类设备中关键的电控技术和先进的自动化水平,改造后效果明显。

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简介：介绍了冷铜锍底吹连续吹炼半工业试验的原理、方法、过程及试验结论。铜锍经过配料，采用底吹熔池熔炼工艺进行吹炼，产出达到预期要求的合格粗铜。为铜锍底吹连续吹炼产业化设计提供了工艺和工程上的必备参数。

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：研究半钢炼钢过程中,在保证终点碳命中率和终点温度的情况下,通过使用焦丁对半钢进行热补偿,提高废钢比,降低铁水消耗,达到加入焦丁4.9kg/t,可降低成本4.94元/t的效果。

简介：采用在线实时计算的磨矿浓度作为检测值,把磨矿浓度作为被调量,控制半自磨机的磨矿浓度,取得了优良的效果.实践证明,该方法必将是半自磨机磨矿浓度控制技术的发展方向.

简介：分析了铝土矿正浮选尾矿的性质，系统研究了正浮选尾矿处理含Pb（Ⅱ）废水，结果表明，对含Ph（Ⅱ）40mg／L的废水，尾矿用量为5g／L，处理时间为1h，在pH〉6．2的条件下，Ph（Ⅱ）去除率接近100％。通过动电位检测，尾矿吸附Pb（II）离子后，等电点从3．63升至5．86。溶液化学计算分析表明，尾矿去除铅离子的较佳吸附pH值为6．2，对应主要组分为Pb^2＋、PbOH^＋。

简介：Theeffectofanexternalelectricfieldonthecrystallizationbehaviorofamorphous(Nd0.1Fe0.9)3Balloywasinvestigated.ThecrystallizationproductofNd2Fe23B3phasewasobtainedforthisamorphousalloyannealedat923Kfor300sinthepresenceofanexternalelectricfieldof300kV·m-1(50Hz);whilethecrystallizationproductsareNd1.1Fe4B4,α-Fe,andFe3Bphasesunderthesameannealingconditionexceptforfree-electricfield.Ontheotherhand,thesampleswereannealedat1023K,whichishigherthanthedecompositiontemperatureofmetastableNd2Fe23B3phase,for600s.Inthecaseofthepresenceofanexternalelectricfield,themetastableNd2Fe23B3phase,asamainphase,isstillstayedinthesample.ThisfactsuggeststhattheexternalelectricfieldenhancesthestabilizationofthemetastableNd2Fe23B3phase.Theeffectoftheexternalelectricfieldonthephaseselectionandstabilizationwasexplainedintermsofthespecificconductancedifferencebetweenthecrystallizationproducts.

简介：充填采空区是目前最为有效的采空区处理方法，然而复杂采空区空间形态和体积等不易确定，这给确定采空区的充填量及充填标高带来一定困难。在赤峰中色白音诺尔矿业有限公司利用C-ALS三维激光扫描系统，对复杂采空区进行探测，并辅以Surpac软件建立采空区三维实体模型，提出模型分割法，利用一定标高的平面分割模型，使分割的模型体积等于充填量，从而快捷、有效的确定复杂采空区所需的充填高度。

简介：InordertoimprovethehydrogenationanddehydrogenationperformancesoftheMg2Ni-typealloys,MgwaspartiallysubstitutedbyLainthealloy,andmeltspinningtechnologywasusedforthepreparationoftheMg20-xLaxNi10(x=0,2,4,6)hydrogenstoragealloys.ThestructuresofthealloyswerestudiedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM)andhigh-resolutiontransmissionelectronmicroscopy(HRTEM).Itwasfoundthatnoamorphousphaseformedintheas-spunLa-freealloy,buttheas-spunalloyscontainingLaheldamajoramorphousphase.WhenLacontentx≤2,themajorphaseintheas-castalloyswasMg2Niphase,butwithfurtherincreaseofLacontent,themajorphaseoftheas-castalloyschangedintoLaNi5+LaMg3phase.Thermalstabilityoftheas-spunalloyswasstudiedbydifferentialscanningcalorimetry(DSC),showingthatspinningratewasanegligiblefactoronthecrystallizationtemperatureoftheamorphousphase.Thehydrogenabsorptionanddesorptionkineticsoftheas-castandas-spunalloysweremeasuredusinganautomaticallycontrolledSievertsapparatus,confirmingthatthehydrogenabsorptionanddesorptioncapacitiesandkineticsoftheas-castalloysclearlyincreasedwithrisingLacontent.ForLacontentx=2,theas-spunalloydisplayedoptimalhydrogendesorptionkineticsat200°C.

简介：结合实例,分析数控车削加工中的基本工艺、机床坐标系和工件坐标系的建立问题;针对FANUC0i系统数控车床的对刀法,阐述了多把刀具的对刀步骤;并对零件进行了手动程序编制.

简介：介绍不锈管坯钢０Ｃｒ１８Ｎｉ１２Ｍｏ２Ｔｉ的冶炼和加工工艺并作了分析探讨。检验分析了该钢的化学成份，显微组织和夹杂物等，结果表明，太钢生产的不锈管坯钢０Ｃｒ１８Ｎｉ１２Ｍｏ２Ｔｉ完全能够达到技术条件的要求，说明现行的生产工艺是可行的。

简介：本文主要进行了二价铜在溶液中用亚硫酸根将其还原成一价铜，并用氯离子作为沉淀剂制取氯化亚铜的研究。氯化亚铜生成过程中会产生H＋，反应体系pH对氯化亚铜产品收率影响最大，所以过程中可通过滴加碳酸钠来控制体系酸度，并根据还原反应发生的速度控制碳酸钠的滴加速度来中和体系中的生成的酸，保持体系pH在2．0～3．0，使氯化亚铜产率达到92％以上。

简介：主要介绍了首钢长钢公司轧钢厂四车间φ10mm螺纹钢二切分轧制工艺的生产实践情况.从成本、调整难度和工艺稳定性方面分析两种工艺方案的优劣,确定最佳工艺方案;通过试轧情况,分析存在问题,提出解决措施.

简介：某矿采空区具有规模大、数量多、空间关系复杂等特点，急需开展复杂采空区群稳定性课题的研究。在对采空区群及其开采环境现场调研的基础上，进行了现场点荷载试验与室内单轴抗拉、抗压强度实验，获得岩体力学参数。采用三维有限元方法对该矿进行数值模拟，模拟结果表明：该矿采空区稳定性偏低，部分空区顶板出现拉应力集中，有可能出现顶板冒落。根据分析结果，提出了相应安全对策，为矿山的安全生产起到指导作用。

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：在离心球墨铸铁管生产过程中抽取性能、金相以及内外壁浇注质量等异常试样,并调取各试样对应光谱直读成分,与正常试样进行对比分析,研究了C含量与缩孔缩松、组织白口化以及外观等缺陷的关系。结果表明w（C）在3.7%~3.8%时其各类缺陷程度较小,中间性能合格率较高。

简介：TheeffectsofUVAphotoirradiatedCe(Ⅳ)dopedTiO2nanoparticle(CDTP)onratcoloncarcinomacellline(C26)growth,cellcycledistribution,andmorphologywerestudiedbyMTTassay,FlowCytometry,andfluorescentstaining.Theresultsindicatethatabout64.6%cellsarekilledafter24hby180μg·ml-1CDTPwhen8minexposedtoUVA,over90%deadfor30mingroup,relativeto18.7%,41.5%ofTiO2atthesameconditionrespectively.Hoe33258stainingofthefixedcellsrevealstypicalapoptoticstructures(apoptoticbodies),andcellsarearrestedinG0/G1phase.