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In this thesis, we take the delay r as a bifurcation parameter to investigate the Hopf bifurcation phenomenon in system (1). By analyzing the associated characteristic transcendental equation of system (2), and using the Hopf bifurcation theorem, we obtain one condition for the existence of Hopf bifurcation in system (1). Furthermore, based on the center manifold theorem and the method of normal form, some interesting results about the properties of Hopf bifurcation are obtained, including the direction of Hopf bifurcation and stability of Hopf bifurcating periodic solutions.

我们以时滞T作为分支参数，研究了系统(1)的Hopf分支现象：通过分析系统(2)的特征超越方程，结合利用Hopf分支定理获得了系统(1)的Hopf分支存在的一个条件；利用中心流形定理和正规形方法分析了系统(1)的Hopf分支的性质，包括分支的方向和分支周期解的稳定性。

Awareness of the existence of these types of associative meaning is important in the correct use of words.

意识的存在，这些类型的联想意义是很重要的，正确使用的话。

Nevertheless defect is not quite may stable, the element of existence unrest is inside, astatic of course element also need not explain.

不过缺点就是可能不太稳定，存在不安定的因素在里面，当然不安定因素也不用解释。

Astral Hill Applying the anniversaries inculcated in the worship of God Sol to his imaginary incarnations, the founders of the ancient Astrolatry made them refer to the several stages of human existence from infancy to mature age.

希尔运用纪念日牙牙学语崇拜上帝溶胶他想象化身，创始人古astrolatry他们指的是人类生存的几个阶段从婴儿走向成熟年龄。

Astral由运 Hill Applying the anniversaries inculcated in the worship of God Sol to his imaginary incarnations, the founders of the ancient Astrolatry made them refer to the several stages of human existence from infancy to mature age.

希尔运用周年灌输崇拜真主溶胶与他想象的化身，创始人古astrolatry使他们指的是几个阶段人类生存的，从萌芽走向成熟年龄。

ESO is the European partner of a revolutionary astronomical telescope ALMA, the largest astronomical project in existence.

ESO是欧洲各伙伴共有的革命性天文台，其中的ALMA是当今最大的射电望远镜项目。

ESO is the Europeanpartner of a revolutionary astronomical telescope ALMA, the largest astronomical project in existence.

ESO是欧洲各伙伴共有的革命性天文台，其中的ALMA是当今最大的射电望远镜项目。

Authority Ranking: the system of the existence of asymmetric class system led by the highest authority of all.

权威阶级：体系中存在不对称的阶级制度，由权力最高者主导一切。

The third section is the research about the existence and asymptotic behavior of positive solutions of the above equation.

第三部分，我们研究了上面方程正解的存在性和渐近性。

Under suitable conditions,using the theory of differential inequalities,the existence and asymptotic behavior of solution for the boundary value problems are studied.

适当的条件下，利用微分不等式理论，讨论了原边值问题解的存在性和渐近性。。

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。