BAF／BH全氢／高氢罩式退火炉

Baosteel BAF/BH pure/rich hydrogen bell-type annealing furnace takes pure hydrogen (99.99% H2) or cracked ammonium (75% H2 25% N2) as its protective gas to ensure the     

Anisotropic Magnetoresistance of Perovskite La2／3Ca1／3 MnO3 ／YBa2Cu4O8／La2／3Cal／3MnO3 Trilayer Films

The anisotropic magnetoresistance (MR) of La2/3Ca1/3MnO3(LCMO)/YBa2Cu4O8 (YBCO) /LCMO sandwiches on (001) SrTiO3 were investigated. Single layer LCMO and sandwiches show in-plane anisotropy of MR. MR strongly depends on the magnetic field direction. A nearly sinusoidal dependence on the angle between the applied magnetic field and the film plane or transport current was observed. A positive MR was present with lower fields applied not only out-of-plane but also in-plane.     

先进的CAD／CAM／CAE软件

1 概述Cimatron公司提供的CAD/CAM/CAE系统,适用于铝合金型材挤压过程中的模具设计与制造、工艺参数设计与挤压全过程的数据管理等.这个系统可用来作2D和3D的设计和绘图,以及高级曲面建模,参数化实体建模,NC加工和有限元分析前置处理.用低成本的PC微机平台,实现CAD/CAM功能.Cimatron在模具行业及数控加工领域等相关产业具有长久的良好信誉,它提供了完善的CAD/CAM界面,可与UG、Pro-E、Mirc-roStation及AutoCAD等软件相结合,可实现从订单→铸锭→模具→产品交货的全过程自动控制.     

2248／574离心鼓风机故障诊断

通过我厂 2 2 4 8/574离心鼓风机三起成功的故障诊断实例 ,详细介绍了电机轴瓦松动、风机喘振和转子不平衡故障的诊断方法及治理措施     

Preparation, Characterization of CuO／CeO2 and Cu／CeO2 Catalysts and Their Applications in Low-Temperature CO Oxidation

CeO2 was synthesized via sol-gel process and used as supporter to prepare CuO/CeO2, Cu/CeO2 catalysts by impregnation method. The catalytic properties and characterization of CeO2, CuO/CeO2 and Cu/CeO2 catalysts were examined by means of a microreactor-GC system, HRTEM, XRD, TPR and XPS techniques. The results show that CuO has not catalytic activity and the activity of CeO2 is quite low for CO oxidation. However, the catalytic activity of CuO/CeO2 and Cu/CeO2 catalysts increases significantly. Furthermore, the activity of CuO/CeO2 is higher than that of Cu/CeO2 catalysts.     

Structural Analysis of Eu2Mn2／3Ta4／3O7 with a Pyrochlore-Related Structure

Eu2Mn2/3Ta4/3O7 specimen was synthesized from Eu2O3, MnO and Ta2O5 in a reducing atmosphere. Structure analysis was carried out by Rietveld method from X-ray diffraction data. The X-ray diffraction profile calculated with monoelinic C2/c model was in a good agreement with the observed X-ray diffraction patterns since several small peaks of super lattice could be also assigned with C2/c symmetry in addition to fundamental reflection peaks. Eu2Mn2/3Ta4/3O7 has two kinds of distorted (Mn, Ta)O6 octahedra and HTB layers, which deviates from the regular forms. Europium atoms coordinate to eight or seven oxygen atoms and lead to two kinds of polyhedra, EuO8 and EuO7 in this compound.     

Influence of Additives Ceria and Lanthana on Performance of Pd／Al／Monolith Honeycomb Catalysts

The effects of ceria and lanthana additives on activity and thermal stabilization of the catalysts for CO oxidation were studied. The results show that the addition of CeO2 clearly improves the catalytic activity, which may derive from the synergic effect between CeO2 and PdO. The catalysts were characterized by means of temperature-programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS) measurements. The XPS results of a slight increase in metal oxidation state reflect that the charge transfers from metal to ceria and ceria is slightly reduced, which leads to a decrease of the Ce-O bond strength. Pd-Ce synergism affects the reduction behavior of the catalysts. The TPR results show that the CeO2 ad-dition lowers the reduction temperature of PdO, while palladium facilitates the reduction of the ceria. For PdO/La2O3/Al2O3/monolith honeycomb catalysts, the aging test measurements at 1050 ℃ and the XRD results show that the formation of LaAlO3 which neutralizes the surface alumina defects inhibits the sintering of alumina.     

刀具用304／440／304不锈钢复合板的热轧和性能

采用φ500 mm和φ50 mm轧机对304(20 mm)/440(3.5 mm)/304(20 ram)不锈钢坯料进行二次复合轧制成2 mm不锈钢复合板.经力学性能试验和组织观察表明,复合板拉伸断裂试样无分层现象,板间晶粒相互穿过界而实现冶金结合,复合板硬度较高,达到刀具的使用要求.     

Ag／SnO2电接触材料的研究进展

综述了Ag/SnO2电接触材料的研究进展,分别从材料的特性、添加剂的影响、制备方法及加工工艺等几个方面进行总结,阐述了Ag/SnO2电接触材料的发展现状,并介绍了纳米技术在该领域的应用状况,探讨了制备技术的改进对Ag/SnO2电接触材料性能的影响。     

Study on Properties of Microemulsion AEO-9/Butanol/Cyclohexane/Salt Aqueous Solution

The microemulsion AEO-9/butanol/cyclohexane/nitrate aqueous solution (or ammonium salt aqueous solution) was studied, which was used as 'micro-reactor' in preparing long afterglow phosphor materials SrAl2O4: Eu2 ,Dy3 . The phase behavior of microemulsion was investigated. The radius of inner water droplet Rw and the change of standard free energy ΔG*o→i were obtained by means of dilution method and theoretical calculation. The result shows that with the increase of W/S, the area of microemulsion region decreases, Rw and ΔG*o→i increase and the microemulsion stability decreases. The structure change and formation area of microemulsion AEO-9/butanol/cyclohexane/nitrate aqueous solution ( or ammonium salt aqueous solution) were offered for the adoption of a synthesis method with newly high efficiency and utility. The particular size and its distribution theory gist, fluorescence life-span, and quenching concentration parameter data were expected. A new approach was explored for finding a new preparation method of rare earths afterglow materials and increasing luminescence intensity without crashing.     

Thermochemical Study on Coordination Complex of Neodymium Trichloroacetic Acid with 8-Hydroxyquinoline

Ｂｏｔｈｒａｒｅｅａｒｔｈｉｏｎｓ[1 ] ａｎｄ 8 ｈｙｄｒｏｘ ｙｑｕｉｎｏｌｉｎｅｐｏｓｓｅｓｓａｎｔｉｂａｃｔｅｒｉａｌｆｕｎｃｔｉｏｎ[2 ] ,ａｎｄｔｈｅｉｒｃｏｍｐｌｅｘｅｓｈａｖｅｍｏｒｅｐｏｗｅｒｆｕｌｄｉｓｉｎ ｆｅｃｔｉｏｎ .Ｔｈｅｂｉｎａｒｙｃｏｍｐｌｅｘｅｓｏｆｔｈｅｍｗｅｒｅｒｅ ｐｏｒｔｅｄａｓｅａｒｌｙａｓ 1 96 3.Ｍｅａｎｗｈｉｌｅ ,ｔｈｅｒｅ ｓｅａｒｃｈｏｎｔｈｅｔｅｒｎａｒｙｃｏｍｐｌｅｘｅｓｏｆｔｈｅｍｈａｓｂｅｃｏｍｅｖｅｒｙａｃｔｉｖｅｉｎｒｅｃｅｎｔｙｅａｒｓａｎ…     

Nd2O3-NdF3-LiF熔盐体系中电导率及钕溶解度的测定

研究了Nd2O3-NdF3-LiF熔盐体系中电导率及钕的溶解度，并根据实验数据拟合了回归方程，分析TN度、LiF浓度、Nd2O3浓度对两种物理性质的影响。结果表明，升高温度，提高LiF浓度以及降低Nd2O3浓度可以提高熔盐体系的电导率；而降低温度，降低LiF浓度以及提高Nd2O3浓度可以减少钕在熔盐中的溶解度。所得研究结果可为电解氟盐法生产钕选择合理的电解质成分提供依据。     

Green, orange, and red upconversion luminescence in Nd3+/Yb3+: Cs2NaGdCl6 powders under 785 nm laser excitation

Nd3+:Cs2NaGdCl6 and Nd3+, Yb3+:Cs2NaGdCl6 polycrystalline powder samples were prepared by Morss method E. Under 785 nm semiconductor laser pumping, the upconversion luminescence of Nd3+ ions in Cs2NaGdCl6 was investigated at room temperature, and three upconversion emissions near 538 nm (Green), 603 nm (Grange), and 675 nm (Red) were observed and assigned to 4G7/2→4I9/2, (4G7/2→4I11/2; 4G5/2→4I9/2), and (4G7/2→4I13/2; 4G5/2→4I11/2), respectively. The dependences of these upconverted emissions on laser power and Nd3+ ion con-eentration were investigated, to explore the upconversion mechanism. The effect of doping Yb3+ ions on the upconversion luminescence of Nd3+ in Cs2NaGdCl6 was also studied under 785 nm laser excitation. The energy transfer processes were discussed as the possible mecha-nism for the above upconversion emissions.     

Mechanisms of Enhancement of Photocatalytic Properties and Activity of Nd^3＋ -Doped TiO2 for Methyl Orange Degradation

Nd^3 -doped TiO2 powders were prepared by the sol-gel method. Their crystal pattern and parameter, the specific surface area, the surface chemical state of Ti and the ratio of O/Ti were characterized. The results show that Nd impurity hinders the crystal transformation, and decreases the relative intensity of (101) peak. The crystallite sizes of Nd^3 -doped TiO2 powders decrease while their specific surface area increase owing to the Nd^3 doping. The XPS measurement shows that the content of Ti (Ⅲ) and ratio of O/Ti on their surfaces increase significantly with the increase of Nd^3 dosage. The adsorption and photodegradation experiments show that the optimum molar content of Nd^3 is 1.2%.     

Effect of Preparation Method on Surface Area and Crystalline Form of CeO2-ZrO2 Solid Solution

TheCeO2 ZrO2 solidsolutionisacrucialcompo nentinthethree waycatalysts(TWCs)usedtocatalyzethesimultaneouspurificationofCO ,HCandNOxfromanautomobileexhaust [1～ 3] .Besidesafeasiblecatalyticactivity ,itshouldhavehighthermalstabilityandoxygenstoragecapacity(OSC) .InordertogainhighperformanceCeO2 ZrO2 solidsolution ,varioustechniqueshavebeendeveloped .ItwasshownthataneffectofpreparationmethodonthesurfaceareaandcrystallineformofCeO2 ZrO2 isveryobvious .Intheearliestwork ,theCeO2 ZrO…     

Capacity of Activated Carbon Derived from Peach Stones by K2CO3 in the Removal of Acid, Reactive, and Direct Dyes from Aqueous Solution

The present research deals with the production of activated carbon by chemical activation using peach stones and its adsorption behavior. The prepared activated carbon was used for the adsorption of three kinds of textile dyes, acid, reactive, and direct dyes, from aqueous solution. The results indicated that the overall adsorption process followed the pseudo-second-order kinetic model. The equilibrium data were found to be well represented by the Langmuir adsorption isotherm model. The calculated adsorption capacities for Reactive Orange 16, Acid Yellow 11, and Direct Red 23 onto activated carbon were 667, 539, and 427?mg?g?1 at 50°C, respectively. Thermodynamic parameters, such as ΔG°, ΔH°, and ΔS°, were also calculated and indicated that the adsorption of dyes onto activated carbon was spontaneous and endothermic in nature.     

Application of nanofiltration to treat rare earth element （neodymium） containing water

The scope of present work was to study the feasibility of a commercial nanofiltration(NF) membrane to reject Nd(III) ions fromsynthetic aqueous solution.The permeates were analyzed using inductively coupled plasma-atomic emission spectrometry(ICP-AES) to findNd(III) concentration.Experimental results indicated that the Nd(III) rejection increased with increase in applied pressure and feed flow rate;and decreased with increase in feed concentration.Rejection of Nd(III) ions using NF membrane were widely influenced by solution pH dueto the charged nature of the membrane which changed with the variation in pH.The use of a surfactant(sodium dodecyl sulphate) in aqueoussolution resulted in its adsorption on the membrane surface,thereby changing membrane characteristics,and in turn influencing the rejection.The complexation step induced had also increased the rejection to a greater extent by forming [Nd-EDTA]-complex thereby increasing itsmolecular weight and thus increasing rejection.     

Solvent extraction of neodymium（III） from acidic nitrate medium using Cyanex 921 in kerosene

The extraction of neodymium(Ⅲ) from acidic nitrate medium was investigated using Cyanex 921 as extractant in kerosene. The metal concentration in the aqueous phase before and after extraction was determined spectrophotometrically by Arsenazo Ⅲ method. The complete equilibration was achieved in 15 min. The effects of shaking time, nitric acid concentration, nitrate concentration, extractant concentration, and temperature on the extraction were studied. The extraction of Nd(Ⅲ) was found to increase very slowly with increase in concentration of HNO3 in the range of 0.001-0.008 mol/L and then decreased when 0.01 mol/L HNO3 was used. The percentage of extraction was increased with increase in nitrate concentration from 0.01-0.45 mol/L and then decreased when nitrate concentration increased to 0.5 mol/L. Quantitative extraction of Nd(Ⅲ) (98%) was obtained from the aqueous phase containing 0.001 mol/L HNO3 and 0.1 mol/L KNO3 using 0.5 mol/L Cyanex 921. On the basis of slope analysis, the extracted complex in the organic phase was proposed to be Nd(NO3)3.2Cyanex 921. The extraction of Nd(III) was found to increase with increase in concentration of metal ion in the range of 0.001-0.05 mol/L from 0.001 mol/L HNO3 and 0.1 mol/L KNO3 with 0.1 mol/L Cyanex 921. The percentage of extraction of neodymium was found to decrease with increase in temperature. From temperature variation studies, the negative value of △H indicated the extraction reaction to be exothermic and the negative value of △S indicated the formation of a stable complex. Almost 100% Nd(Ⅲ) was recovered from the fully loaded organic phase using 0.002 mol/L H2SO4 and 0.01 mol/L HCl.     

有机次膦酸在硝酸体系下提取稀土研究

本文采用溶剂萃取法,用有机次磷酸萃取剂从富含稀土元素镧(La）、钕(Nd）、钇(Y)、铈(Ce）的硝酸溶液中提取稀土。选择盐酸为反萃剂。考察了酸度、萃取剂浓度、相比和萃取时间对萃取率和反萃率的影响,结果表明,二异丁基膦酸萃取稀土的最佳条件为：室温,酸度0.2mol/l,萃取剂浓度40%,A/O比1:5,萃取时间15min,镧（La）、钕（Nd）,铈（Ce）和钇（Y）分别为41.68%、81.30%、81.29%和100%。当利用盐酸作为反萃实验的反萃剂时其最佳条件为：室温,初始水相稀土溶液为0.3 mol/L,反萃剂盐酸为6 mol/L,负载有机相与反萃剂盐酸溶液的体积比为1:6,将反萃的震荡时间改变为5min,应用上述条件的镧(La）、钕(Nd）、铈(Ce）、钇(Y)的反萃率分别为92.45%、94.88%、95.76%、93.34%。有机次膦酸对稀土元素（La）、钕（Nd）、铈（Ce）和钇（Y）的萃取效率不同。钇的提取率高于镧、钕和铈。它是一种有机次膦酸,对轻稀土元素亲和力低,对重稀土元素亲和力强。