非对称振子波函数和能级方程的表示及其数值解

给出了非对称振子波函数和能级方程的具体表示,以及某些典型情况的能级数值和波函数的形状。对非对称振子的某些情况,其解的存在性曾是有争论的。本文由理论分析和数值计算证实:即使在这些情况下,其解也是存在的。解的具体表示和数值解可以由消发散方法和计算机求出。     

审计质量与制度安排

以信息经济学的理论作为分析基础,从概念与理论框架分析入手,论述了低质量审计信息产生的制度原因,并以银广厦事件为例进行了实证分析,阐明了制度安排对审计质量的影响,最后提出应对措施。     

噁唑硼烷催化酮砜不对称还原的半经验方法研究

对噁唑硼烷催化前手性酮砜不对称还原反应进行了半经验MNDO研究.结果表明,该不对称还原反应是放热的,反应的手性控制步骤是氢从BH3向酮羰基碳的转移,氢转移反应通过一个六元环过渡态完成,是不可逆的.     

非对称损失下的点预测问题

从统计判决理论角度考虑了非对称Linex损失下的点预测问题。定义了Linex无偏预测量并讨论了与之相关的一些结论。利用十分统计量给出了最优Linex无偏预测量。     

利用不对称交叉偶联反应合成S-(+)-萘普生

用β-氨基烷基膦的NiCl2配合物为手性催化剂,以6-甲氧基-2-溴萘和a-溴代丙酸酯的有机锌试剂为原料,通过不对称交叉偶联反应合成S-(+)-萘普生.     

对称应力模型的一个疑难

应力对称模型对显著应力梯度问题，显著微结构介质，对波长较小的动力学问题，已经表现出与实验结果的显著差异。就各向同性线弹性均匀固体的静力学问题，介绍应力对称模型的一个疑难，对于直角形区域角顶的两边承受不等的剪应力问题，对称应力模型无解。引入非对称应力模型和偶应力化解了这一疑难。分析表明，随着到边界距离的增加，非对称应力模型的解趋近于对称应力模型的解。     

Profile of the composition fractions in neutron stars

The composition fractions of β-stable neutron stars and their radial distributions are investigated based on Skyrme-Hartree-Fock theory and Tolman-Oppenheimer-Volkoff (TOV) equation. It is found that a pure neutron interior with a radius of 3.5 km can exist in the neutron stars. When the radius is greater than 3.5 km, the fractions of the proton, electron and μ⁻ appear and increase with the increment of the radius, then decrease after reaching their maximum at the radius of 8 km. These results make it possible to further study the thermal evolution and magnetic properties of the neutron stars.     

人眼的色适应对荧光屏显示色貌的影响

用双眼不对称匹配法研究人眼在观察计算机视觉显示终端彩色监视器荧光屏时,视觉系统对复杂背景的色适应及其对荧光屏显示色貌的影响.研究结果表明,背景的平均颜色和目标与背景的色差及亮度差对色适应引起的色位移有显著的影响.在定量估计人眼对复杂背景的色适应引起的色貌变化时,可以把视觉系统看作一个积分响应灵敏度取决于背景颜色和亮度平均值的信息处理系统。     

Preparation of MCM-41-supported chiral Salen Mn （Ⅲ） catalysts and their catalytic properties in the asymmetric epoxidation of olefins

A secondary amino-modified mesoporous molecular sieve MCM-41 was obtained by reaction of bis(3-(triethoxysilyl)propyl)amine with MCM-41. The chiral Salen-Mn (III) complex was anchored onto the modified MCM-41 by a multi-step grafting method and two heterogenized catalysts with different Mn contents were obtained. The catalysts were characterized by XRD, N2 adsorption, ICP, FT-IR and DR UV-Vis. Their catalysis on asymmetric epoxidation of several olefins was studied with NaClO and m-CPBA as oxidants respectively. It was found that both the activity and enantioselectivity of the cata- lysts decreased after the homogeneous catalyst was heterogenized. The reasons resulting in the de- crease of catalytic performance were discussed.     

L-焦谷氨酸酯的合成方法研究

以价廉易得的L－谷氨酸为原料，经酯化，高温热环合得L－焦谷氨酸酯，并对已有文献的后处理方法进行了改进，化学产率高于文献值，且产物不易消旋。