基于朴实OT模型的形式意义不对称研究概观

形式-意义不对称研究是伴随OT出现而兴起的课题和学术难题。本文主要介绍基于朴实OT模型的形式-意义不对称解决方案及其相关评论,并作适当简评。

Form Invariance of Birkhoffian Systems

The form invariance of Birkhoffian systems is a kind of invariance of the Birkhoffian equations under the infinitesimal transformations. The definition and criteria of the form invariance are given, and the relation between the form invariance and the Noether symmetry is studied.

Form Invariance of Lagrange System

To study a form invariance of Lagrange system, the form invariance of Lagrange equations under the infinitesimal transformations was used. The definition and criterion for the form invariance are given. The relation between the form invariance and the Noether symmetry was established.

Form Invariance of Routh Equations

The form invariance of Routh equations in holonomic systems is studied. The definition and criterion for the form invariance under the infinitesimal transformations are given. The relation of the form invariance with the Noether symmetry and the Lie symmetry is discussed.

英语翻译中基于语义不对称的语态选择

英语语态中存在明显的不对称现象,并非所有句子都能够实现主动语态变和被动语态的相互转换。本文从语态语义不对称现象入手,分析翻译中语态转换所产生的问题,进而探讨翻译中语态的选择。

高分子手性催化剂在不对称合成应用中的新进展

主要综述了 1 990～ 1 999年期间高分子手性催化剂在不对称还原、烷基化、Diels Alder、醇醛缩合、氢甲酰化、环氧化、双二羟基化反应等不对称合成领域的应用研究最新进展。

Mean width inequalities for symmetric Wulff shapes

We establish the mean width inequalities for symmetric Wulff shapes by a direct approach.We also yield the dual inequality along with the equality conditions.These new inequalities have Barthe’s mean width inequalities for even isotropic measures and its dual form as special cases.