Novikov superalgebras with <Emphasis Type="Italic">A</Emphasis><Subscript>0</Subscript> = <Emphasis Type="Italic">A</Emphasis><Subscript>1</Subscript><Emphasis Type="Italic">A</Emphasis><Subscript>1</Subscript>

Novikov superalgebras are related to quadratic conformal superalgebras which correspond to the Hamiltonian pairs and play a fundamental role in completely integrable systems. In this note we show that the Novikov superalgebras with A ₀ = A ₁ A ₁ and dim A ₁ = 2 are of type N and give a class of Novikov superalgebras of type S with A ₀ = A ₁ A ₁.     

稀土氧化物前驱体的合成及其对YAG:Ce荧光粉影响的研究

分别用草酸和碳酸氢铵为沉淀剂通过沉淀法制备氧化钇及钇铈复合氧化物.并以其为原料,在高温下合成YAG:Ce黄色荧光粉.用XRD、SEM、粒度测试仪、光谱分析仪等表征了氧化物前驱体和YAG:Ce.SEM和比表面测试结果表明,碳酸氢铵沉淀法制备的氧化钇或钇铈复合氧化物的一次粒径约100nm,形貌规则,比表面积高.用该钇铈复合氧化物合成的YAG:Ce具有发光强度高、形貌规则、粒度小等优点.     

Optimization of the Laminate Structure of a Composite Cylinder Based on the Combination of Response Surface Methodology (RSM) and Finite Element Analysis (FEA)

This study optimized the laminate structure of a composite cylinder under the constraint of minimum layup thickness. Based on the progressive damage theory, a finite element model of the cylinder was established, and the NOL ring tensile test was used to verify the accuracy of the damage theory. The winding angle, the number of layers, and the helical/hoop ratio (the stacking sequence) were selected as the optimization factors, and the burst pressure value was used to evaluate the quality of the laminate structure. Then the orthogonal experiments were designed by RSM. Combined with FEA, the function model of the burst pressure of the gas cylinder and each optimization factor was established to obtain the optimal layering scheme, satisfying the minimum burst pressure. In addition, finite element analysis was used to verify the optimal scheme, demonstrating that the error of the burst pressure predicted by the quadratic model established by the response surface design was not more than 5%. This study provides a faster and more efficient optimization method for the optimization design of composite gas cylinder layers.     

含氟共轭微孔聚合物的制备及其吸附应用研究

共轭微孔聚合物由于其高的比表面积、优良的物理化学稳定性、多样的合成方法以及沿分子骨架延伸的共轭结构等特点,近几年得到广泛关注和快速发展.本工作以1,3,5-三氟-2,4,6-三碘苯作为含氟单体与1,3,5-三乙炔基苯通过Sonogashira偶联反应聚合得到含氟共轭微孔聚合物F-CMP.通过把氟原子引入到共轭微孔聚合物骨架中,F-CMP显示出良好的疏水性能,与水的接触角达到145°.得益于良好的疏水性能和适宜的孔隙结构,相比于骨架结构相似的不含氟共轭微孔聚合物（H-CMP）,F-CMP对油和有机溶剂的吸附量得到大幅提高,且显示出高的吸附速率和良好的吸附循环性.     

稀土与天青石共伴生矿焙烧及浸出过程研究

稀土与天青石共伴生多金属矿主要由稀土氟碳酸盐和天青石组成,研究了含稀土和锶的混合矿的焙烧及浸出过程,考察了焙烧温度、焙烧时间、浸出初始酸浓度、浸出温度、浸出时间等对浸出率的影响,获得优化的工艺参数为:焙烧温度500℃,焙烧时间2 h,浸出初始酸浓度1.0 mol.L-1,浸出温度35℃,浸出时间1 h,稀土浸出率达95%以上,锶浸出率小于5%,几乎不进入溶液相而保留在固相浸出渣中得以分离和富集。     

稀土萃取分离废水制备高纯碳酸氢镁溶液过程中铁杂质的行为与影响

以稀土冶炼分离过程中产生的氯化镁废水和白云石为原料制备氢氧化镁,然后采用碳化法制备高纯碳酸氢镁溶液,研究了铁杂质离子的行为与影响。结果表明:碳酸氢镁溶液中的杂质铁是由于二价固态铁发生碳化反应而引入并以重碳酸亚铁(Fe(HCO3)2)形式存在,即碳化反应过程是除铁的核心工序,Mg(HCO3)2溶液经过除铁后沉淀稀土离子可以明显降低沉淀产物中铁杂质含量。本文为氯化镁废水-白云石碳化法制备碳酸氢镁溶液过程中铁杂质离子的去除提供切实可行的理论指导。     

含氟硫酸体系HEH/EHP萃取铈(Ⅳ)的动力学研究

采用层流恒界面池法研究了2-乙基己基膦酸单2-乙基己基酯(HEH/EHP)萃取含氟复杂硫酸体系中铈(Ⅳ)的动力学。考察了搅拌速度、水相金属离子浓度、萃取剂浓度、酸度和温度对萃取速率的影响。试验结果表明:萃取反应为一级反应,萃取反应的正向表观活化能为50.8 kJ·mol-1,属于化学反应控制。试验得到萃取动力学方程为R=k[Ce(HF)(HSO4-)3+]1.05[H2A2]2.07[H+]-2.43,并探讨了反应机制。     

反相流动注射催化光度法测定痕量钒的研究

基于在非离子表面活性剂OP存在下,以柠檬酸作活化剂,V(v)对溴酸钠氧化罗丹明B褪色的催化作用,建立了痕量钒的反相流动注射分析(r-FIA)新方法。方法的线性范围为10～200μg·L~(-1),检出限为1.9μg·L~(-1),对40μg·L~(-1)钒平行测定11次的相对标准偏差为1.5％,进样频率为16次·h~(-1)。方法应用于各种水样中痕量钒的测定,并进行回收试验,回收率为90％～104％。