浅谈连城锰矿4号矿段排土场的安全管理实践

针对连城锰矿4号矿段排土场的特点、影响稳定因素及可能产生的危害，在实践中采取了有效的管理措施，防止了排土场危害的产生，保证了排土场的稳定。     

土质边坡稳定分析中条分法与有限元法的比较

对比分析了土质边坡稳定性计算中条分法和有限元法的特点，讨论了在有限元法中边坡稳定系数的计算方法，并针对铜钟水电站库区左岸滑坡分别采用条分法和有限元法研究其稳定性，计算结果表明两种计算方法得到的滑坡稳定系数规律相同，但条分法计算值一般大于有限元值，反映出条分法中部分基本假设与实际情况存在一定差异。     

Studies on the structural and ionic transport properties at elevated temperatures of La1−xMnO3±δ synthesized by a wet chemical method

Structural transformation and ionic transport properties are investigated on wet-chemically synthesized La_1−xMnO₃ (x=0.0–0.18) compositions. Powders annealed in oxygen/air at 1000–1080 K exhibit cubic symmetry and transform to rhombohedral on annealing at 1173–1573 K in air/oxygen. Annealing above 1773 K in air or in argon/helium at 1473 K stabilized distorted rhombohedral or orthorhombic symmetry. Structural transformations are confirmed from XRD and TEM studies. The total conductivity of sintered disks, measured by four-probe technique, ranges from 5 S cm⁻¹ at 298 K to 105 S cm⁻¹ at 1273 K. The ionic conductivity measured by blocking electrode technique ranges from 1.0×10⁻⁶ S cm⁻¹ at 700 K to 2.0×10⁻³ S cm⁻¹ at 1273 K. The ionic transference number of these compositions ranges from 3.0×10⁻⁵ to 5.0×10⁻⁵ at 1273 K. The activation energy deduced from experimental data for ionic conduction and ionic migration is 1.03–1.10 and 0.80–1.00 eV, respectively. The activation energy of formation, association and migration of vacancies ranges from 1.07 to 1.44 eV.     

NdCl_3·nTBP/MgCl_2-AlR_3催化体系合成丁二烯橡胶

探讨了以NdCl_3的磷酸三丁酯(TBP)溶液为主催化剂、烷基铝为助催化剂、MgCl_2为载体组成的Ziegler-Natta型催化体系引发丁二烯(Bd)聚合的某些规律。用AlEt_3作助催化剂,聚合物的顺1,4-结构含量仅为57％,反1,4-结构含量为42％;而以Al(i-Bu)_3作助催化剂,聚合物的顺1,4-结构含量为88％,反1,4-结构含量为11％。各种陈化体系中,以NdCl_3·nTBP/MgCl_2-Al(i-Bu)_3-Ip三元体系的催化活性最高,当Nd/Bd(摩尔比)为7×10~(-5)时,单体转化率达80％。低温聚合可获得高顺式、高分子量聚合物。     

高温稀土永磁Sm2(Co,Cu,Fe,Zr)17 的制备和性能

制备了高温稀土永磁材料Sm(Coba1Fe0．26Cu0．05Zr0．026)7．0，研究了磁性能与工艺条件的关系．结果表明：提高烧结温度可使材料的Br和(BH)max增大，但是使Hci降低；适当提高真空预烧温度，可使材料在较低烧结温度下致密化，具有较高的Hci和(BH)max和温度稳定性．真空预烧温度过高使性能的急剧降低，其主要原因是Sm的析出．在最佳工艺条件下材料的磁性能参数分别为：Br1．08T3Hci2286kA／m，Hcb932kA／m，(BH)max220．8kJ／m^3；β20-200℃为-0．19％／℃．     

稀土溶液标准物质的研制

选择7种稀土元素:La、Ce、Sm、Eu、Yb、Lu、Y为研究对象,采用高纯稀土氧化物(≥99 99%)为原料,经ICP MS及ICP AES对纯度进行分析后,分别制备成浓度为1000μg mL的稀土溶液标准物质。采用准确、可靠并能溯源的EDTA络合滴定法进行量值核对、均匀性及稳定性检验。对标准物质的不确定度进行了全面的评定。研制的稀土溶液一级标准物质,总不确定度优于0 6%,稳定性达两年以上。     

Monoalkyl Esters of Isoalkylphosphonic Acid as Extractants in Rare Earth Separation

Four monoalkyl esters of isoalkylphosphonic acids have been studied for the chromatographic separation ofrare earths (RE).The relationship between distribution ratios and acid concentration of the eluants forsamarium and ytterbium has been explored.The characteristics of these extractants loaded onto macroreticularpoly (methyl methacrylate) resin beads for the separation of lanthanum,cerium,praseodymium and neodymiumhave been compared.Among the extractants studied,mono(1-methylheptyl) ester of isooctylphosphonic acidwas found to be the best for RE separation.The acidity for separation is lower than any known P-containingextractants for the same purpose.For instance,with 1.73 mol·L~(-1) nitric acid as eluent,thulium,ytterbium andlutetium can be separated quantitatively.The extractant-loaded resins possess high column efficiency with goodkinetic characteristics.The extraction mechanism was also explored.     

高等级公路边坡防护设计

分析了影响边坡稳定的因素 ,对不同环境条件下采用的不同路基边坡防护类型进行了介绍 ,重点阐述了经济有效的三维固土网垫结合植被护坡的类型 ,指出边坡稳定是保障公路畅通的重要基础     

铒氨基酸固态配合物的光声光谱研究

合成了Er(Gly)3Cl3·3H2O、Er(Ala)3Cl3·3H2O和Er(Gly)3Phen·3H2O二元及三元固态配合物微晶粉末,在300nm～800nm范围内测定并解释了其光声光谱。通过对光声相对强度计算得到铒氨基酸固态配合物的光声支量,讨论了氨基酸配体对中心稀土离子铒f-f跃迁的微扰作用。结合Er(Ala)3Cl3·3H2O配合物的光声光谱和吸收光谱研究了其荧光性质及弛豫模型。     

CO毒化AB5型合金分形特征研究

研究了三种贮氢合金 L a Ni5、L a Ni4 .7Al0 .3、Ml Ni4 .5Al0 .5被 10 0× 10 - 6 CO毒化后的分形特征 ,求出这三种合金在含 10 0× 10 - 6 CO的氢中循环 ,分维分别为 0 .2 5 4 7、0 .170 9、0 .0 72 5。可以较好的解释合金被毒化的宏观现象。