简介：FrequencyupconversionofEr3+inalkalilanthanumgallateglasses(Na2O-La2O3-Ga2O3orNLG)wasinvestigated.Visibleemissionsat532,546,and660nmcorrespondingtothe2H11/2→4I15/2,4S3/2→4I15/2,and4F9/2→4I15/2transitionswereobservedundercontinuouswaveexcitationat980nm.Thequadraticpumppowerdependenceoftheseemissionsindicatedatwophotonupconversionprocess.Atapumpintensityof52W·cm-2at980nm,frequencyupconversionefficienciesof1.1×10-2and2.7×10-3wereobtainedforgreenandredemissions,respectively.

简介：介绍道岔附带曲线概念及其有关规定，结合中3条原有附带曲线的特点，阐述用坐标法对铁路线路上小型曲线的维修方法。

简介：Differentfluxeswereusedtosynthesizelongpersistencephosphors,calciumsulfidesactivatedbyEu2+andTm3+,byconvenientsolid-statemethod.ThephosphorusingNH4Fasafluxhasgoodcrystallinityandlargeparticlesize,itsstabilityagainstwaterandotheratmosphericcomponentsisenhanced,anditsafterglowislongerandfluorescentintensityismoreintensethanthoseofthephosphorusingNH4Clasflux.TheirPLintensitiesvariedwithtimeinmoistairweremeasured,noremarkablechangewasfoundforthosepreparedwithNH4FfluxincontrastwithNH4Clasflux.SousingNH4Fasfluxisagoodmethodtoenhancethestabilityofalkalineearthsulfides.

简介：6月底，中国十九冶集团承建的泰钢炼钢GOR炉技改工程顺利投料炼钢。泰钢炼钢GOR炉技改工程是泰钢集团提高产能、增强市场竞争力、与下游工序生产相匹配的技改工程。中国十九冶集团承担泰钢炼钢系统GOR炉（3×75吨）本体汽化烟道等汽化系统及各层平台的拆除、更换施工，以及投产运行前的调试工作等。

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简介：Basedonthethermodynamicallyself-consistentanalysisandoptimizationofthreesub-binarysystemsoftheternarysystemPrCl3-CaCl2-MgCl2,thethermodynamicsofthisternarysystemhasbeenstudied.UsingHillertmodelandtakingMgCl2asanasymmetriccomponent,thePrCl3-CaCl2-MgCl2phasediagramhasbeencalculated.Theagreementbetweencalculatedandmeasuredcompositionsandtemperaturesatdeflectingpointsonliquidusisgood.Thesystemisasimpleeutecticonewithaeutecticpointat26.0mol%PrCl3,41.5mol%CaCl2,32.5mol%MgCl2;560℃（calculated）and26.0mol%PrCl3,39.4mol%CaCl2,34.6mol%MgCl2;546℃（measured）,respectively.

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.

简介：采用水热法制备平均粒度约300nin的六方相Bi2Te3纳米粉末。再以Bi2Te3粉末为原料，采用封管熔炼法制备N型（Bi2Te3）0.9（AgxBi2-xSe3）0.1（x为Ag的摩尔分数。x=0.1，0.2，0.3，0.4）合金粉体材料，通过快速热压制备N型（Bi2Te3）0.9（AgxBi2-xSe3）0.1块状热电材料。在300~550K温度范围内研究该材料的热电性能与Ag掺杂量之间的关系，以及热压工艺对材料热电性能的影响。结果表明在775K，40MPa条件下烧结20min后材料的相对密度达到97％以上，晶粒大小在3gm左右。当Ag掺杂量x=0.2时，在300K温度下热导率达到最小值0.71W／mK，同时获得最高的热电优值（ZT值）1.07。

简介：本文通过对企业营销调研、信息系统开发的分析,阐述了营销观念是企业经营思想上观念根本的变革.对企业改变传统的思想,以市场为导向具有参考价值.

简介：采用碱熔处理样品，酸化后，移取部分溶液稀释后引入ICP测定ZrO2、TiO2、Fe2O3含量，剩余溶液用强碱分离钛、铁、锰等干扰元素后，EDTA—CuSO4法返滴定Al2O3，终点明显，检测重现性好；

简介：美国宇航局在加州帕萨迪纳的喷气推进实验室研究成功了一种制造YBa2Cu3O7-α高温超导电缆（封装在金属套管内）的新方法。据称,这种方法成本较低,过程易于控制,且对各种前体材料有很强的适应能力。该法分4个步骤:生产具有化学（配）比的前体（Precursor）粉;将前体粉包封在金属套管内;用轧制的方法使前体粉固结;在液态锂金属浴槽内进行处理,使之转变成超导组

简介：针对3~#皮带的产尘特点,分别在尾轮和首轮采用独立的防尘系统,加大收尘风量、定向气流排尘、活动刚性密闭、空气幕隔离、扁平罩收尘及低速文丘里除尘器除尘等综合防尘措施,防尘效果良好:3~#皮带工作场所粉尘浓度最高时才1.5mg/m~3,低于粉尘卫生标准2mg/m~3的允许值,尾气排放粉尘浓度最高时达47.0mg/m~3,在卫生标准100mg/m~3的允许范围之内.

简介：主要介绍如何使用3DMax三维建模软件和VR-Platform虚拟现实软件设计和实现虚拟吊车仿真的步骤和方法，实现对吊车的虚拟可视化操作。有效降低了企业吊车人员培训的成本消耗，同时降低了吊车学习过程误操作带来的风险。

简介：1概述我厂现有300m~3高炉三座,总容积900m~3,1994年上半年,高炉工艺操作管理在1993年的基础上,继续全面贯彻"优质、低耗、高产、长寿"的指导思想和"以顺行为基础,维护、保持好合理的操作炉型,提高风温,增加煤量,重视炉缸工作,搞好上部调剂"的操作方针,克服了原燃料供应紧张,

简介：Ceriasphereswithdifferentsizesandsulfurizedproductswithcorrespondingmorphologywerepreparedbyhydrothermalandgas-solidreactionmethodat600–800°CunderCS2atmosphereforashorttime,respectively.Dimensionaleffectinpreparationofγ-Ce2S3wasfirstlyinvestigatedbymeansoftechniquessuchasscanningelectronmicroscopy(SEM),X-raydiffraction(XRD),thermalgravimetricanalysis(TGA)andspectrophotometer.Theresultsshowedthatwhenceriananoparticleswithsmallsizewereusedasprecursors,theγ-Ce2S3couldbepreparedatthelowertemperatureandthebadlysinteredproductswereobtained;whenceriananoparticleswithlargesizewereemployedasprecursors,pureγ-Ce2S3wasdifficultlyobtainedevenifthetemperaturewasupto800°Candtheproductstendedtokeeptheiroriginalsize.Theheat-resistancepropertyoftheγ-Ce2S3withlargesizewasbetterthanthesmallerone,andthepureγ-Ce2S3preparedfromprecursorwithsmallsizehadagoodpigmentaryperformance.

简介：针对长江钢铁1250m3高炉的开炉准备工作、开炉参数的选择、填充配料等方面的问题,对开炉及达产过程进行了分析总结.通过精细准备,合理控制操作参数以及调整后续过程,使得此次生产实践过程在工艺控制方面基本做到了平稳有序,实现了顺利开炉、快速达产的预定目标.

简介：Theproductionindexesweredeterioratedduetoqualitycoke,UtilizationFactor2.0t/m3·d,PCI100kg/T,AccordingtoAnalysistheMechanismofProductionoflowhotstrengthcokequalityonBlastFurnaceSmooth,ThecokecoldstrengthretainedM10<6.3overalongperiodoftimeinordertoinsurecokegranularityandpermeabilityindexincohesivezone;Aad<12andgranularitytranquilizationisusefulBFproduction.ThePCIprotectcokehotstrengthbyhighratebituminouscoals;highrateH2inBFgasbatecokedemolish.blastfurnaceoperation,onmonitoringandoperationBF,tranquilizationtheBLASTFURNACEtemperature,PTcontrolsparameterareaisabout1500℃;strengthenmanagementofpermeabilityindex,improveTop-pressureforBlastFurnace,StrengtheningtheManagementoftheRawMaterialsandFuel,logicalrateofsinterLeveloffabout70%toimproveMetallurgicalPropertiesofBurdens.ParametersofwindhavebeenadoptedAbout10000-11000kg·m/s;,theoreticalflametemperatureinablastfurnacehavebeenadjustedareaisabout2050-2200℃;thetemperaturedirectionaboutcopperstavemanagementestablishedact;accordingtothismeasures,AccordingtoImprovementCenterGasFlowInstabilityinthefirstplace,thegasflowdistributionturnstothereasonablestate.Strengthenfurnacecasthouseoperationect,UtilizationFactorimprove2.2t/m3·d,PCI130kg/T.ColdandhotstatestrengthindexesofcokeonBFproductionwereinstability.AccordingtooptimizetheOperatingParameteinspecificallyeconomytechnologyindexesconduction,theBFcondictioncankeepingsteadyandsmooth.

简介：安钢永通2×8m^2竖炉球团工艺始建于上世纪70年代中期，1999年和2001年分别对2^#、1^#竖炉本体及部分配套设施进行了改造。改造后，球团矿产质量均有了明显提高，但与全国同行业相比仍有较大差距。2003年，公司决定对球团工艺进行大的改造，新上配料、烘干、润磨系统，以取代现有的配混料系统，同时预留了3^#竖炉的产能。