增稠剂的反相乳液聚合及增稠性能研究

通过反相浮液聚合的方法合成一种印花增稠剂，并对它的应用性能进行了较为全面的测试，结果表明，合成的增稠剂有比较强的增稠性能，而且耐电解质性能明显优于同类产品KG－202。并用电子显微镜观察了在不同pH值时乳胶粒子的结构。     

火焰原子吸收光谱测定XF—120膦羧酸缓蚀阻垢剂中的钴

本文研究了ＸＦ－２１０膦羧酸缓蚀阻垢剂中微量金属元素的火焰原子吸收光分光光度法的测定，方法简便，省时，具有良好的精密度和准确度，平均相对标准偏差为１．４２％，平均回收率为９５．７％。     

XF3 ( X = N, P, As )分子价层电离势的三阶代数图-表构建法计算

应用三阶代数图-表构建法(third-order algebraic diagrammatic construction scheme 简写为ADC(3) )计算了XF3(X=N, P, As)的价层垂直电离势(VIP)。结果表明：内壳层电子关联对电离主峰位置影响非常小;来自不同理论结果的分子结构对电离主峰位置有较小影响;基组差异则表现的非常明显。由计算值和实验结果比较可知：在实验分子结构和cc-pVDZ基组下, 应用ADC(3)得到的电离势与实验值整体上差距最小;ADC(3)计算的第一电离势往往小于实验值约0.4～0.8 eV, 其余主峰位置与实验值差距约0.01～0.3 eV;随基组增大,ADC(3)结果与实验值偏差明显增大。因此, 利用ADC(3)方法计算价层电离势时,建议使用价层电子关联,基组则采用cc-pVDZ或DZP, 结构实验外也可直接从实验或耦合簇、密度泛函等理论获得。     

Two new modified Gauss–Seidel methods for linear system with -matrices

In 2002, H. Kotakemori et al. proposed the modified Gauss–Seidel (MGS) method for solving the linear system with the preconditioner XF7H-2-5Y/0?wchp=dGLbVlb-zSkzS" alt="View the MathML source" title="View the MathML source" align="absbottom" border="0" height=11 width="80"/> [H. Kotakemori, K. Harada, M. Morimoto, H. Niki, A comparison theorem for the iterative method with the preconditioner (XF7H-2-96/0?wchp=dGLbVlb-zSkzS" alt="View the MathML source" title="View the MathML source" align="absbottom" border="0" height=11 width="52"/>) J. Comput. Appl. Math. 145 (2002) 373–378]. Since this preconditioner is constructed by only the largest element on each row of the upper triangular part of the coefficient matrix, the preconditioning effect is not observed on the nth row. In the present paper, to deal with this drawback, we propose two new preconditioners. The convergence and comparison theorems of the modified Gauss–Seidel methods with these two preconditioners for solving the linear system are established. The convergence rates of the new proposed preconditioned methods are compared. In addition, numerical experiments are used to show the effectiveness of the new MGS methods.