查询词典 imbedding theorem

The following exciting results are revealed: 1 When considering the influence of some nonlinear elements such as hard-limit of exciters, the effects of some devices such as Power System Stabilizer and Static Var Compensator which can introduce positive damping in power system, the reasonability of system parameter values in simulation, the SNB surface and HB surface on the boundary of SSSR will turn close to each other and even coalesce together; 2 Under some conditions, coupling between slow exciters and shunt capacitors will bring negative damping in power system dynamics, which increases the possibility of oscillatory instability. So the power system with mass shunt compensators is easily subjected to the oscillatory instability. In recent years, chaotic phenomena of power system have been reported many times. Some simulation studies even found chaos existing inside the power system SSSR. In this dissertation, chaotic phenomena in power systems are thoroughly studied in order to make clear the relation of chaos and SSSR. The following results are derived: 1 Based on Li-Yorke Theorem and their definition on the chaos, the existence of chaos in power system is verified; 2 Three possible routes of causing chaos in power system are found and deeply investigated. They are route of cascading period doubling, route of directly initial energizing and route of torus bifurcation (or quasi-periodicity). The latter two routes are investigated for the first time in power system stability studies; 3 When the stability conditions of chaos are broken, it is found they can lead to voltage collapse, angle divergence, or voltage collapse with angle divergence simultaneously.

针对在电力系统小扰动稳定区域内可能存在混沌吸引域的有关报道，本文深入研究了电力系统混沌现象的出现途径和与系统失稳模式之间的关系：1利用Li-Yorke定理和Li-Yorke的混沌定义，从理论上证明了电力系统混沌现象的存在性；2发现了电力系统中导致混沌出现的三种可能途径：倍周期分岔导致混沌、初始能量直接激发混沌和经由环面分岔导致混沌，并对后两种新发现的途径进行了较为细致的研究；3发现了混沌极限环破裂导致电压崩溃、角度失稳以及电压崩溃和角度失稳同时出现的现象，其中混沌极限环破裂导致系统角度失稳和电压崩溃及角度失稳同时出现的现象均属首次报道；4证明由微分-代数方程描述的系统模型，其小扰动稳定域的边界只包含HB、SNB和SIB三种分岔界面，在SSSR的内部和边界上，均不可能存在会导致混沌的点，从而将混沌现象排除在小扰动稳定域的研究之外，简化了后者的研究工作。

FERM principle.key theorem.bounds on rate ofuniform convergence.

模糊风险泛函，FERM原则，关键定理，一致收敛速度的界

A woman views a mixed media installation,"Rain theorem", by Russian artist Alexei Kallima on show on June 4, 2009 at the Russian pavilion of the Art Biennale in Venice.

一个女人的观点混合媒体装置，&雨定理&，由俄罗斯艺术家阿列克谢Kallima上显示在2009年6月4日在俄罗斯馆艺术双年展在威尼斯。

Depend on 3color theorem take the lamp shell used in yellow.

色。根据三色定理将灯壳用为黄色，夜间开灯时灯光成为黄绿色，这样使喜欢黄色的害虫大量扑灯，而使喜欢绿色的草蛉、瓢虫等益虫少扑灯，大大提高了害虫诱杀率，降低了益害比。

Based on the analysis of the pitch error measure theorem for screw,the dynamic measure system of pitch error for lead screw constituted by single-chip microcomputer is discussed.

在分析丝杠螺距误差测量基本原理的基础上，简述了由单片微机组成的滚珠丝杠螺距误差动态测试系统，并开发了计算机辅助自动分析测控软件。

The relationship between orthogonal linear transformation and theorem of projection is demonstrated in the angle of mathematics analysis meanwhile validating its correctness through analyzing typical applications of transformation.

本文从数学分析的角度推证了正交变换与投影定理的内在联系，通过信号分析中典型正交变换的应用进行了验证，从而揭示了正交变换的内在本质。

In 1975, Gary Meisters developed the Two-Ears Theorem that proved this

1975年，加里迈斯特斯开发了双耳定理的证明了这一点

Different from the existing kernel feature extraction methods, the kernel function used in the proposed one is not required to satisfy Mercers theorem so that they can be chosen from a wide range.

与现有的核特征抽取方法不同，该方法不需要核函数满足Mercer定理，从而增加了核函数的选择范围。

Support vector machines are a very specific class of algorithms, characterized by the use of a maximal margin hyper-plane the theory of kernels, the absence of local minima, convex optimization the sparseness of the solution, Mercers theorem and the capacity control obtained by acting on the margin.

支持向量机是机器学习领域若干标准技术的集大成者，它集成了最大间隔超平面、Mercer核、凸二次规划、稀疏解和松弛变量等多项技术，在若干挑战性的应用中，获得了目前为止最好的性能。

Over the past few decades, people in real field on differential mid-value theorem on a lot of research.

过去的几10年里，人们在实数域上对微分中值定理进行了非常多的研究。

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。