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In chapter 4, methods for producing beams with orbital angular momentum are introduced.

第四章介绍了产生拥有轨道角动量的光束的方法。

The precise definition of the angular momentum of a body is complicated .

要给物体的角动量下精确的定义是困难的。

In this chapter we will discuss angular momentum.

本章将讨论角动量。

Angular momentum conservation is based on the isotropy of space.

角动量守恒是以空间的各向同性为基础的。

In other words, the magnitude of the angular momentum is increased, its direction remaining the same.

换句话说，即角动量的大小增加了，但其方向不变。

In recent years, there have been many researches focusing on orbital angular momentum of light beam in the field of optics.

近年来，在光学领域内，关于光束轨道角动量的研究，受到广泛的关注。

The variation of the atmospheric angular momentum is obvious in the progress.

此期间大气角动量的年际变化也呈现从小到大的过程。

In chapter 2, the theoretical basis of the orbital angular momentum of light is presented.

主要从经典电磁场理论出发，分别介绍了傍轴近似和非傍轴近似下光束的轨道角动量和光束的参数之间的关系。

In motions of rotation angular momentum appears in much the same way as linear momentum appears in motion of translation.

在旋转运动中的角动量产生的方式与平移运动中的线动量的产生是基本相似的。

In chapter 3, the orbital angular momentum of complex astigmatic elliptical beams is investigated.

第三章研究了复杂像散椭圆光束的轨道角动量。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。