简介：Thelayer-by-layercomplexationtechniqueofpolymerandmetalionwassuccessfullyutilizedtofabricatetheuhrathinmuhilayerfilmofpoly(3-thiopheneaceticacid(PTAA)andTb^3+ionbydippingthesubstratesalternativelyinpolymerandTb^3+ionaqueoussolutions.UV-vismeasurementrevealedthattheabsorbancehaslinearitywiththebilayernumberfromlayertolayerandtheX-rayphotoelectronspectrum(XPS)confirmedtheexistenceofTb^3+ion.ThepHofboththepolymerandTbCl3solutionsinfluencethethicknessdramaticallywhiletheconcentrationofthesolutionsisnotsosensitive.TheluminescentspectrumofthecomplexfilmshowsthecharacteristicemissionofTb^3+ionaswellastheligandindicatingtheformationofthecomplex.

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.

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简介：通过加强进厂原燃料管理、强化炉前出铁管理、实施大富氧率喷吹技术和优化高炉基本操作制度，太钢4350m^3高炉的燃料比降到500kg／t以下，利用系数达到了2．4t／m^3·以上，实现了高炉稳定、均衡和高效生产。

简介：宜春钽铌矿机电车间铆接班采用下列工艺措施完成一个焊道熔火线开裂至整个母材的4m~3电铲铲斗修复任务。1.先用102不锈钢焊条打底,再用高锰钢焊条填满;2.在电弧切割的同时浇水冷却,以

简介：太钢1350m3高炉在炉体破损严重的情况下,对高炉进行了大检修,并采取一系列强化冶炼的措施,收到良好效果.

简介：丹麦议会于6月27日投票通过了该圉的新能源协议，决定到2030年再新建三座海上风电场，总容最至少为240万千瓦。协议还提出了丹麦新的能源发展目标，要求到2030年，可再生能源占能源消耗总量的55％。

简介：分析了3S技术的特点,考虑矿区的具体情况和要求,探讨了3S技术应用于矿区工程的可行性和应用目标.

简介：ThesurfaceofacommercialY3Al5O12:Ce3+phosphorwasmodifiedby99%NH4F+CH3COOHsolutioninasupersonicbathwithwatertemperatureof80oCfor4h.Thescanningelectronmicroscopy（SEM）resultsshowedthattheedgeangleswerenotassharpastheunmodifiedparticlesandtheflatsurfacesturnedroughwithmanymicro-structurescovered.Positronlifetimemeasurementsquantitativelyshowedthatsurfacedefectswereremovedawaybymorethan50%.Asaresult,thephotoluminescencedeterminationsshowedthatthebackscatterlosswasreducedby4.2%andtheemissionpowerwasenhancedby5.6%afterthesurfacemodification.Theconversionefficiencywasgreatlyimprovedfrom47.3%to51.1%,aspresentedbythefluorescenceimages.Therefore,itwouldbegreatlyhelpfulfortheimprovementofefficiency,transparencyandstabilityofpc-LED.Moreover,thismethodwassignificantlysuitableformassproductionduetoitseasyoperationandlowcost.

简介：AdetailedstudyofthefluorescenceemissionpropertiesandenergytransfermechanisminEr3+/Tm3+co-dopedleadsilicateglasseswasreported.Enhancednearinfrared1.8μmandvisibleup-conversionemissionswereinvestigatedunder808and980nmexcitations,respectively.TheenergytransfermechanismbetweenEr3+andTm3+wasanalyzedaccordingtotheabsorptionspectra,theemissionspectraandthelevelstructuresofEr3+andTm3+.TheenergytransferefficiencybetweenEr3+andTm3+reached68.1%intheEr3+/Tm3+co-dopedleadsilicateglasseswhenpumpedby808nmlaserdiode.Basedontheabsorptionspectra,theJudd-Ofeltparameters,spontaneousemissionprobability,absorptionandemissioncrosssections,gaincoefficientswerecalculatedandanalyzed.Itwasfoundthatthecalculatedemissioncrosssectionandthemaximumgaincoefficientaround1.8μmwere4.9×10–21cm2and1.12cm–1,respectively.TheseresultsindicatedthattheEr3+/Tm3+co-dopedlead-silicateglasseshadpotentialapplicationinnearinfraredlasers.

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：Thesinglecrystalofthecomplex[Sc（NO3）3（H2O）2]·（15C5）hasbeenpreparedinacetonitrile.Thenewcomplexhasbeencharacterizedbyelementalanalysis,IRspectra,solubilityandmolarconductancemeasurements.ThestructureofthecomplexisdeterminedbysinglecrystalX-raydiffractionanalysis.

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简介：(Ba0.66Sr0.33)Mg0.8Al11.47O19:Tm0.013+(BSMA:Tm3+)phosphorwassynthesizedbysolid-statereactions.ThesamplewascharacterizedbyX-raydiffraction(XRD),scanningelectronicmicroscope(SEM),vacuumultraviolet(VUV)spectra,ultraviolet(UV)spectraandFT-IRspectrum.XRDpatternrevealsthatBSMA:Tm3+hasthesamestructureasBaAl12O19phase.SEMimageillustratesthatthephosphorhasthehexagonalshapeanddeepslicestructure.VUVandUVemissionspectraat20,50and100Kshowthatthelowtemperatureluminescenceintensitiesbecomeweakgraduallywiththeincreasingofthetemperatureunder147and254nmexcitation.Thestrongbroadbandpeaksataround357and397nmandthepeakat516nmunder147nmexcitationallcorrespondtothecharacteristictransitionsofTm3+ions.However,underUV(254nm)excitation,themainpeakbecomes530nmwhichhasveryhighlineintensity,andthepeaksatabout362and403nmareveryweak.Theexcitationspectrumat20Kshowsthattherearethreeabsorptionpeaksataround153,186and193nmwhen516nmemissionismonitored.Theabsorptionpeaksof[AlO4],[AlO6]andAl-OcanbeobservedinFT-IRspectrum.

简介：近日德意志央行官网新闻通稿称从2013年底起，截止2016年末，其从美国纽约和法国巴黎将属于德国的583吨黄金运回法兰克福。如此大规模运回黄金储备，使得德国提前完成了原定2020年实现的储备目标。德国人从海外搬回家的这些黄金储备，说起来还有漫长心酸的历史。二战之前，为了防止苏联入侵本土，德国提前把自己的部分黄金储备运往海外储藏。进入冷战时代，东西德分裂，德国98％的黄金储备都存储在英美等远离欧洲前线的地方，确保安全。

简介：SphericalYAG:Ce3+phosphorparticleswithnarrowsizedistributionwerepreparedbyspraypyrolysis.Theeffectsoftheconcentrationofsolution,theflowrateofcarriergasandtheannealingtemperatureonthephosphormorphologywerestudied.Theproductivityofprecursorparticlesshowsatrendofdropafterrisingwiththeincreaseofconcentration.Raisingtheflowrateofnitrogencanimprovetheproductivityoftheprecursorparticles.Phosphorpreparedbyspraypyrolysishasobviouslyhigheremissionintensitythanthatsynthesizedbysolidstatereaction,spraypyrolysismakesCe3+ionswelldistributedinthecrystallatticeastheluminescentcenters,andphosphorparticleshaveregularsphericityandnarrowsizedistribution.

简介：新区3200m3高炉喷煤系统采用中速磨负压制粉,一级高浓度低压脉冲长袋式收粉器收粉。喷吹系统采用双系列双罐并列单管路加分配器浓相输送工艺。喷煤系统按烟煤和无烟煤混喷设计,制粉系统按强爆炸性烟煤设计,最大喷煤比250kg/t,尾气排放煤粉质量浓度≤30mg/m3,喷煤系统投运后,运行正常,烟煤配比达40%,高炉喷吹效果良好。

简介：截至2018年,汽运分公司在用6m^3铲运机76台。多年来6m^3铲运机前驱动桥的损坏、维修量一直居高不下,不但加大了修理工的维修工作量,还导致备件费用高,成本压力增大。因此,对6m^3铲运机前驱动桥的损坏进行原因分析,找出症结所在,制定应对措施,就显得尤为重要。

简介：中铝山西分公司氧化铝3号因转窑窑前鼓风机因轴承失效、机壳移位等原因造成风机振动大,虽更换了轴承恢复了机壳位置,但振动未消除:后采用因素排除的方法,在检修过程中实行过程工序确认制度,最终找出了风机振动大的原因,和对缺陷处理的方法.