Solidification in Soft-Contact Continuous Casting Mold with Alternating Electromagnetic Field

Ａｓａｎｅｆｆｅｃｔｉｖｅｔｅｃｈｎｉｑｕｅ ,ｓｏｆｔ ｃｏｎｔａｃｔｅｌｅｃｔｒｏ ｍａｇｎｅｔｉｃｃｏｎｔｉｎｕｏｕｓｃａｓｔｉｎｇｔｅｃｈｎｏｌｏｇｙｉｓｒｅｃｅｎｔｌｙｉｎｔｒｏｄｕｃｅｄｉｎｔｈｅｃｏｎｔｉｎｕｏｕｓｃａｓｔｉｎｇｐｒｏｃｅｓｓｔｏｃｏｎ ｔｒｏｌｔｈｅｉｎｉｔｉａｌｓｏｌｉｄｉｆｉｃａｔｉｏｎａｎｄｉｍｐｒｏｖｅｔｈｅｑｕａｌｉｔｙｏｆｂｉｌｌｅｔ[1,2 ] .Ｔｈｅｈｉｇｈｆｒｅｑｕｅｎｃｙｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｆｉｅｌｄｉｓｕｓｅｄｍａｉｎｌｙｔｏｃｏｎｆｉｎｅｔ…     

Extraction Mechanism of Rare Earths with Sec-Octylphenoxy Acetic Acid by Two-Phase Titration Technique

Ｒａｒｅｅａｒｔｈｅｌｅｍｅｎｔｓａｒｅｕｓｅｄｗｉｄｅｌｙｂｅ ｃａｕｓｅｏｆｔｈｅｉｒｓｐｅｃｉａｌｅｌｅｃｔｒｉｃａｌ,ｍａｇｎｅｔｉｃａｎｄｏｐｔｉｃａｌｎａｔｕｒｅｓ .Ｗｉｔｈｔｈｅｈｉｇｈ ｓｐｅｅｄｄｅｖｅｌｏｐ ｍｅｎｔｏｆｍｏｄｅｒｎｓｃｉｅｎｃｅａｎｄｔｅｃｈｎｏｌｏｇｙ ,ｔｈｅｎｅｅｄｆｏｒｒａｒｅｅａｒｔｈｓｗｉｔｈｈｉｇｈｐｕｒｉｔｙｉｓｉｎｃｒｅａｓ ｉｎｇ .Ｓｏｉｔｉｓｖｅｒｙｉｎｔｅｒｅｓｔｉｎｇｔｏｓｔｕｄｙｔｈｅｓｅｐａ ｒａｔｉｏｎａｎｄｐｕｒｉｆｉｃａｔｉｏｎｏ…     

Background Absorption of Lutecium and Ytterbium Matrices in Graphite Furnace Atomic Absorption Spectrometry

Ｒａｒｅｅａｒｔｈｃｏｍｐｏｕｎｄｓｏｆｈｉｇｈｐｕｒｉｔｙｈａｖｅｂｅｅｎｅｘｔｅｎｓｉｖｅｌｙｕｓｅｄｉｎｍａｎｙｎｅｗｍａｔｅｒｉａｌｓｓｕｃｈａｓｌａｓｅｒ,ｍａｇｎｅｔｉｃａｎｄｆｌｕｏｒｅｓｃｅｎｔｍａｔｅｒｉａｌｓ．Ｔｈｅｒｅｆｏｒｅｔｈｅｒｅｉｓａｈｉｇｈｄｅｍａｎｄｆｏｒｔｈｅｐｒｅｃｉｓｅａｎａｌｙｓｉｓｏｆｔｈｅｕｌｔｒａｔｒａｃｅｉｍｐｕｒｉｔｙｅｘｉｓｔｉｎｇｉｎｈｉｇｈｐｕｒｅｒａｒｅｅａｒｔｈｃｏｍｐｏｕｎｄｓ．Ｇｒａｐｈｉｔｅｆｕｒｎａｃｅａｔｏｍｉｃａｂｓｏｒｐ…     

Investigation on RQ Embrittlement Mechanism of FeCuNbSiB Soft Magnetic Alloy

ＳｉｎｃｅｔｈｅｎａｎｏｃｒｙｓｔａｌｌｉｎｅｓｏｆｔｍａｇｎｅｔｉｃａｌｌｏｙＦｅ73 .5Ｃｕ1Ｎｂ3Ｓｉ13 .5Ｂ9ｗｉｔｈｅｘｃｅｌｌｅｎｔｓｏｆｔｍａｇｎｅｔｉｃｐｒｏｐｅｒｔｉｅｓｗａｓｄｅｖｅｌｏｐｅｄｂｙＹｏｓｈｉｚａｗａＹｅｔａｌｉｎ1988[1] ,ｉｔｓｍａｇｎｅｔｉｃｔｈｅｏｒｙ ,ｃｈｅｍｉｃａｌｃｏｍｐｏｓｉｔｉｏｎ ,ｐｒｅｐａｒａｔｉｏｎｔｅｃｈｎｏｌｏｇｙ ,ｓｔｒｕｃｔｕｒｅａｎｄｔｒａｎｓｉｔｉｏｎａｓｗｅｌｌａｓｓｐｒｅａｄｉｎｇａｐｐｌｉｃａｔｉｏｎｗｅｒｅｓｔｕｄｉｅｄｅｘｔｅ…     

Hydrogen Absorption Thermodynamic Properties of Rare-Earth Based Hydrogen Storage Alloy in Benzene

Ｔｈｅｐｒｏｐｅｒｔｙｔｈａｔｔｈｅｒａｒｅｅａｒｔｈｂａｓｅｄｈｙ ｄｒｏｇｅｎｓｔｏｒａｇｅａｌｌｏｙｓｃａｎａｂｓｏｒｂ/ｄｅｓｏｒｂａｌａｒｇｅａｍｏｕｎｔｏｆｈｙｄｒｏｇｅｎａｔｒｏｏｍｔｅｍｐｅｒａｔｕｒｅｈａｓｂｅｅｎｕｓｅｄｓｕｃｃｅｓｓｆｕｌｌｙｆｏｒｈｙｄｒｏｇｅｎｓｅｐａｒａ ｔｉｏｎ ,ｐｕｒｉｆｉｃａｔｉｏｎ ,ａｎｄｔｒａｎｓｐｏｒｔａｔｉｏｎ .Ｉｎｔｈｅａｐｐｌｉｃａｔｉｏｎｓ ,ｉｎｏｒｄｅｒｔｏａｖｏｉｄｐｒｏｂｌｅｍｓｓｕｃｈａｓｔｈｅｏｂｓｔｒｕｃｔｉｏｎｔｏｇａｓ…     

Preparation,Photo and Electroluminescence Properties of Novel Rare Earth Aromatic Carboxylates

ＳｉｎｃｅＫｉｄｏｅｔａｌ.ｈａｖｅｆｉｒｓｔｒｅｐｏｒｔｅｄｏｎｏｒｇａｎｉｃｅｌｅｃｔｒｏｌｕｍｉｎｅｓｃｅｎｃｅ (ＥＬ)ｕｓｉｎｇｒａｒｅｅａｒｔｈ (ＲＥ)ｃｏｍｐｌｅｘａｓｔｈｅｅｍｉｔｔｉｎｇｌａｙｅｒ[1] ,ｍｕｃｈｗｏｒｋｈａｓｂｅｅｎｆｏｃｕｓｅｄｏｎｔｈｉｓｆｉｅｌｄｄｕｅｔｏｉｔｓｈｉｇｈｃｏｌｏｒｐｕｒｉｔｙ[2～ 4] .Ｈｏｗｅｖｅｒ,ｔｈｅｋｅｙｐｒｏｂｌｅｍｗｉｔｈｒａｒｅｅａｒｔｈβ ｄｉｋｅｔｏｎｅｃｏｍｐｌｅｘｅｓｉｓｔｈｅｉｒｐｏｏｒｔｈｅｒｍａｌｓｔａｂｉｌｉｔｙａｎｄ…     

Accumulation of Rare Earth Elements in Spinach and Soil under Condition of Using REE and Acid Rain Stress

Ｔｈｅｒｅａｒｅｍａｎｙｒｅｐｏｒｔｓｏｆｓｔｕｄｉｅｓｏｎｔｈｅｅｆｆｅｃｔｓｏｎｐｌａｎｔｓｂｙａｃｉｄｒａｉｎ[1～ 3 ] ａｎｄｕｔｉｌｉｚａ ｔｉｏｎｏｆＲＥＥ[4～ 7] ａｎｄａｆｅｗｓｔｕｄｉｅｓｏｎＲＥＥｕｓ ｉｎｇａｓｃｈｅｍｉｃａｌａｄｊｕｓｔｍｅｎｔｔｏｐｒｏｔｅｃｔｉｎｇｐｌａｎｔｓｆｒｏｍｂｅｉｎｇｄａｍａｇｅｄｂｙａｃｉｄｒａｉｎｓｔｒｅｓｓｕｎｄｅｒｎａｔｕｒａｌｃｏｎｄｉｔｉｏｎ .ＴｈｉｓｓｔｕｄｙｗａｓｆｏｃｕｓｅｄｏｎｔｈｅａｃｃｕｍｕｌａｔｉｏｎｏｆＲＥＥｉｎｓｐｉｎ…     

Preparation of MachinableY—TZP／LaPO4 Composite Ceramics byLiquid Precursor Infiltration

Ｃｅｒａｍｉｃｍａｔｅｒｉａｌｓｈａｖｅｂｅｅｎｕｓｅｄａｓｅｎ ｇｉｎｅｅｒｉｎｇｍａｔｅｒｉａｌｓｂｅｃａｕｓｅｏｆｔｈｅｉｒｈｉｇｈｓｔｒｅｎｇｔｈａｎｄｈｉｇｈｈａｒｄｎｅｓｓ .Ｔｈｅｄｉｓａｄｖａｎｔａｇｅｏｆｓｕｃｈｃｅｒａｍｉｃｓｉｓｔｈｅｄｉｆｆｉｃｕｌｔｙｉｎｍａｃｈｉｎｉｎｇａｆｔｅｒｓｉｎｔｅｒｉｎｇ ,ｗｈｉｃｈｌｅａｄｓｔｏｈｉｇｈｍａｃｈｉｎｉｎｇｃｏｓｔ.Ｔｏｄｅｃｒｅａｓｅｉｔ ,ｖａｒｉｏｕｓｃｅｒａｍｉｃｓｗｉｔｈｒｅａｓｏｎａｂｌｅｍａｃｈｉｎａｂｉｌｉｔｙ ,ｃａ…     

Study on Key Techniques for Producing High Performance NdFeB Sintered Permanent Magnets

ＮｄＦｅＢｍａｇｎｅｔｓｈａｖｅｂｅｅｎｉｍｐｒｏｖｅｄｄｒａ ｍａｔｉｃａｌｌｙｓｉｎｃｅｉｔｗａｓｉｎｖｅｎｔｅｄｉｎ 1 983 .Ｔｗｏｔｙｐｅｓｏｆｓｉｎｔｅｒｅｄｍａｇｎｅｔｓ ,ｈｉｇｈｅｎｅｒｇｙｐｒｏｄ ｕｃｔｓ ((ＢＨ ) ｍａｘ)ａｎｄｄｏｕｂｌｅｈｉｇｈ (ｈｉｇｈ(ＢＨ ) ｍａｘａｎｄｈｉｇｈｃｏｅｒｃｉｖｉｔｙ (ｉＨｃ) )ａｒｅｔｈｅｔｗｏｔｅｎｄｅｎｃｉｅｓｆｏｒＮｄＦｅＢｓｉｎｔｅｒｅｄｍａｇｎｅｔｓ .Ｂｏｔｈｆａｃｔｏｒｉｅｓａｎｄｒｅｓｅａｒｃｈｉｎｓｔｉｔｕｔｅｓａｒｅｆｏｃｕｓ…     

Visible-Light Excitated Photocatalytic Activity of Rare Earth Metal-Ion-Doped Titania

Ｔｉｔａｎｉｕｍｄｉｏｘｉｄｅｉｓｓｕｐｐｏｓｅｄｔｏｂｅｔｈｅｂｅｓｔｍａｔｅｒｉａｌｉｎｐｈｏｔｏｃａｔａｌｙｔｉｃａｃｔｉｖｉｔｙ ,ｓａｆｅｔｙ ,ｃｏｓｔａｎｄｓｔａｂｉｌｉｔｙ .Ｂｕｔｌａｒｇｅｂａｎｄ ｇａｐｅｎｅｒｇｙ(3 .2ｅＶ)ｆｏｒｂｕｌｋａｎａｔａｓｅＴｉＯ2 ｌｉｍｉｔｓｉｔｓｐｒａｃ ｔｉｃａｌａｐｐｌｉｃａｔｉｏｎｉｎｔｈｅｃａｓｅｏｆｎａｔｕｒａｌｓｏｌａｒｌｉｇｈｔ.Ａｔｐｒｅｓｅｎｔ ,ｖａｒｉｏｕｓｍｅｔｈｏｄｓ ,ｓｕｃｈａｓｉｏｎｉｍｐｌａｎｔａｔｉｏｎａｎｄｔｈｅｃｏ…     

LiCl-KCl熔盐La^3+在钨电极上的电化学还原机理

以LiCl-KCl为电解质体系,LaCl3为原料,利用循环伏安法、计时电位法和计时电流法研究773K时镧离子在钨电极上的电化学还原过程。结果表明,在773K、50%KCl-50%LiCl-2%LaCl3的熔盐体系中,镧离子在钨电极上还原是一步转移3个电子反应(La^3++3e→La),相对于Ag/AgCl电极析出电位为-2.05V;镧在钨电极析出过程中出现成核极化现象,且通过循环伏安和计时电流法可判断镧离子在钨电极上的析出还原过程为受扩散控制的准可逆反应,扩散系数D=6.36×10^-5 cm^2/s。     

Influence of La, Y, Gd, Cu, NH4^＋ Ions and DMSO on Luminescent Property of Terbium Complexes with Sulfosalicylate

Ｔｈｅｌａｎｔｈａｎｉｄｅｃｏｍｐｌｅｘｅｓｏｆｏｒｇａｎｉｃｌｉｇ ａｎｄｓａｓｆｌｕｏｒｅｓｃｅｎｔｍａｔｅｒｉａｌｓｈａｖｅｒｅｃｅｉｖｅｄｅｘ ｔｅｎｓｉｖｅａｔｔｅｎｔｉｏｎ .Ｔｈｅｕｓｅｏｆｆｌｕｏｒｅｓｃｅｎｔｏｒｇａｎｏ ｌａｎｔｈａｎｉｄｅｃｏｍｐｌｅｘｅｓｒｅｑｕｉｒｅｈｉｇｈｆｌｕｏ ｒｅｓｃｅｎｃｅｉｎｔｅｎｓｉｔｙａｎｄｌｏｗｃｏｓｔｃｏｍｐｌｅｘｅｓ .Ｉｎｒｅｃｅｎｔｙｅａｒｓ ,ｔｈｅｆｌｕｏｒｅｓｃｅｎｃｅｅｎｈａｎｃｅｍｅｎｔｏｆＴｂ(Ⅲ )ｏｒＥｕ(Ⅲ )ｃｏｍｐｌｅｘｅ…     

La_2O_3对微波烧结Cu_(20)Fe_(80)合金组织性能的影响

采用机械合金化和冷压微波烧结法制备了Cu_(20)Fe_(80)合金,研究了La_2O_3添加对Cu_(20)Fe_(80)合金组织性能的影响,利用扫描电子显微镜和X射线衍射仪等设备观察和分析Cu_(20)Fe_(80)合金组织形貌和相组成,并测定了合金的致密度和硬度。结果表明:Cu_(20)Fe_(80)合金粉体呈层片状,随La2O3质量分数的增加,合金粉体得到细化,机械合金化程度增强;Cu_(20)Fe_(80)合金粉体的冷压压坯组织呈层片状,随La_2O_3质量分数的增加,压坯致密程度和成型性提高;微波烧结后组织呈现层片状,随La_2O_3质量分数的增加,空隙先减少后增加,烧结组织致密度和硬度先提高后减小;综合分析,La_2O_3最佳添加量为0.2%。     

Electrochemical Behavior of Dissolved Fe2O3 in Molten CaCl2-KF

The elctrochemical behavior of dissolved Fe2O3 in 82.5CaCl2-17.5KF(mole percent,%)was studied using cyclic voltammetry,chronoamperometry,and galvanostatic electrolysis at 827℃,and the deposits were characterized by XRD and SEM.Pure iron was deposited on a rotating cylinder(210 r/min)with a cell voltage less than-1.0 V.Deposition rate was controlled by diffusion on a molybdenum electrode.The diffusion coefficient of iron species Fe(Ⅲ)in the melt at 827℃was found to be 9.7×105cm2/s.     

微量稀土元素Tb、La掺杂对Fe-Al合金结构和磁致伸缩性能的影响

为了研究微量稀土元素Tb和La掺杂对Fe81Al19合金结构和磁致伸缩性能的影响及影响机制,采用真空电弧熔炼法制备了Fe81Al19、Fe81Al19La0.1和Fe81Al19Tb0.1三种铸态合金。用X射线衍射仪(XRD)和扫描电镜联合能谱仪(SEM/EDS)分析了合金的微结构。用振动样品磁强计(VSM)和磁致伸缩测量仪测试了合金的磁性能和磁致伸缩系数。结果表明,Fe81Al19合金由单一的bcc结构A2相组成,而掺杂稀土后的Fe81Al19Tb0.1和Fe81Al19La0.1合金均由bcc结构的A2主相和少量富稀土相组成。稀土Tb和La的掺杂使Fe81Al19合金沿<100>晶向择优取向,且Fe81Al19Tb0.1合金择优取向更加明显。此外,三种合金的磁化功大小排序为:Fe81Al19Tb0.1> Fe81Al19La0.1> Fe81Al19。表明稀土元素掺杂导致Fe-Al合金具有更大的磁晶各向异性,且Tb的掺杂效果更加明显。磁致伸缩系数测试表明,与Fe81Al19合金相比,稀土掺杂合金的磁致伸缩系数明显增大,而且Fe81Al19Tb0.1合金的磁致伸缩系数增大的更加明显,大约是Fe81Al19合金的3.2倍,为86×10^-6。稀土掺杂合金磁致伸缩系数增大的原因主要源于掺杂稀土使Fe-Al合金沿<100>晶向择优取向和稀土导致合金具有高磁晶各向异性。     

Electrochemical properties of cobalt-free La0.80Mg0.20Ni2.85Al0.11M0.53 （M=Ni, Si, Cr, Cu, Fe） alloys

In order to investigate the effect of different B-site additions on phase structure and electrochemical properties of cobalt-free La-Mg-Ni based alloys, La0.80Mg0.20Ni2.85Al0.11M0.53 (M=Ni, Si, Cr, Cu, Fe) hydrogen storage alloys were prepared and studied systemati-cally. X-ray powder diffraction showed that the alloys consisted mainly of LaNi3 phase and LaNi5 phase except that Cr addition caused a minor Cr phase. Electrochemical testing indicated that alloys with additional Ni, Cr, Cu or Fe were activated within only 1-2 cycles, while that with Si addition needed 4 cycles. Adding Si, Cu and Fe increased cycling stability of La-Mg-Ni based alloys. However, maximum discharge capacity decreased from 362 mAh/g to 215 mAh/g in the order of Ni>Fe>Cu>Cr>Si. In addition, electrochemical kinetics of alloy electrodes was also researched by measuring high rate discharge ability (HRD), hydrogen diffusion coefficient (D) and limiting current density (IL).     

Carvedilol inhibition of lipid peroxidation. A new antioxidative mechanism

To define the molecular mechanism(s) of carvedilol inhibition of lipid peroxidation we have utilized model systems that allow us to study the different reactions involved in this complex process. Carvedilol inhibits the peroxidation of sonicated phosphatidylcholine liposomes triggered by FeCl2 addition whereas atenolol, pindolol and labetalol are ineffective. The inhibition proved not to be ascribable (a) to an effect on Fe2+ autoxidation and thus on the generation of oxygen derived radical initiators; (b) to the scavenging of the inorganic initiators O2*- and *OH; (c) to an effect on the reductive cleavage of organic hydroperoxides by FeCl2; (d) to the scavenging of organic initiators. The observations that (a) carvedilol effectiveness is inversely proportional to the concentration of FeCl2 and lipid hydroperoxides in the assay; (b) the drug prevents the onset of lipid peroxidation stimulated by FeCl3 addition and; (c) it can form a complex with Fe3+, suggest a molecular mechanism for carvedilol action. It may inhibit lipid peroxidation by binding the Fe3+ generated during the oxidation of Fe2+ by lipid hydroperoxides in the substrate. The lag time that carvedilol introduces in the peroxidative process would correspond to the time taken for carvedilol to be titrated by Fe3+; when the drug is consumed the Fe3+ accumulates to reach the critical parameter that stimulates peroxidation. According to this molecular mechanism the antioxidant potency of carvedilol can be ascribed to its ability to bind a species, Fe3+, that is a catalyst of the process and to its lipophilic nature that concentrates it in the membranes where Fe3+ is generated by a site specific mechanism.     

Effects of Lanthanum Chloride on Activity of Redox System in Plasma Membrane of Rice Seedling Roots

ａｒｅｅａｒｔｈｓｈａｖｅａｂｅｎｅｆｉｃｉａｌｅｆｆｅｃｔｓｏｎｐｒｏｍｏｔｉｎｇｔｈｅｃｒｏｐｇｒｏｗｔｈａｎｄｉｎｃｒｅａｓｉｎｇｉｔｓｙｉｅｌｄ .Ｓｏｍｅｒｅｓｅａｒｃｈｅｒｓｈａｖｅｄｅｍｏｎｓｔｒａｔｅｄｔｈａｔｔｈｅｒａｒｅｅａｒｔｈｓｃａｎｎｏｔｅｎｔｅｒｔｈｅｐｒｏｔｏｐｌａｓｔａｎｄｏｎｌｙｓｔａｙｏｕｔｓｉｄｅｔｈｅｐｌａｓｍａｍｅｍｂｒａｎｅ[1] .Ｔｈｅｒｅｉｓａｎｏｘｉｄａｔｉｏｎ ｒｅｄｕｃｔｉｏｎ (ｒｅｄｏｘ)ｓｙｓｔｅｍｏｎｔｈｅｐｌａｓｍａｍｅｍｂｒａｎｅｏｆｐｌ…     

Comparative analysis of the dissolution kinetics of galena in binary solutions of HCl/FeCl3 and HCl/H2O2

A comparative study of the dissolution kinetics of galena ore in binary solutions of FeCl3/HCl and H2O2/HCl has been undertaken.The dissolution kinetics of the galena was found to depend on leachant concentration,reaction temperature,stirring speed,solid-to-liquid ratio,and particle diameter.The dissolution rate of galena ore increases with the increase of leachant concentration,reaction temperature,and stirring speed,while it decreases with the increase of solid-to-liquid ratio and particle diameter.The activation energy (Ea) of 26.5 kJ/mol was obtained for galena ore dissolution in 0.3 M FeCl3/8.06 M HCl,and it suggests the surface diffusion model for the leaching reaction,while the Ea value of 40.6 kJ/mol was obtained for its dissolution in 8.06 M H202/8.06 M HC1,which suggests the surface chemical reaction model for the leaching reaction.Furthermore,the linear relationship between rate constants and the reciprocal of particle radius supports the fact that dissolution is controlled by the surface reaction in the two eases.Finally,the rate of reaction based on the reaction-controUed process has been described by a semiempirical mathematical model.The Arrhenius and reaction constants of 11.023 s-1,1.25×104 and 3.65×102 s-1,8.02×106 were calculated for the 0.3 M FeCl3/8.06 M HCl and 8.06 M H202/8.06 M HCl binary solutions,respectively.     

Effects of Lanthanum on Redox Systems in Plasma Membranes of Casuarina equisetifolia Seedlings Under Acid Rain Stress

Theplasmamembraneisapenetrablebarrier ,whichcancontroltheexchangeofsubstancesacrossmembranesincells ,andalsoistheintermediumandreceptorofenergyorinformationtransferencebetweencellsandenvironment.Theplasmamembraneredoxsystem(PMRS)meanstheelectrontransferchainsonplasmamembrane .Owingtohavethepossibilityofejectingprotons ,energizingplasmamembraneandhavingthefunctionofacceleratingtransportationofsoluteacrossmembrane ,theplasmamembraneredoxsystemswerepaidmuchattentionto[1] .Acidrainisoneofthemost…