查询词典 discrete category

The thesis adduces a discrete adaptive sliding mode algorithm for nonlinear discrete uncertain systems, and use adaptive laws to estimate uncertainty of the algorithm. So it largely reduces the priori information of the systems and become a simple easy method.

本文针对非线性离散不确定系统的变结构控制，提出了一种离散自适应滑模控制方法，利用自适应率对算法的不确定部分进行了估计，从而减少了先验知识，设计简单，容易实现。

Discrete sliding mode theory has been applied to electrostatic levitation system in which general discrete state space expressions with parameter variation have been set up based on gyro rotor electrostatic force equation and other annuluses including high-voltage amplifier, position sensor and time delay.

本文将离散滑模控制理论应用于静电陀螺悬浮系统，根据陀螺转子静电力方程以及各环节特性(包括高压放大器、测量环节和数字控制器的滞后环节)，建立考虑系统参数变化的广义被控对象离散状态空间表达式。

The formulized predictive control presented in chaper 5 is applied to the control theory of discrete event systems. System behavior model is established for discrete event systems.

在离散事件系统上建立与系统行为描述相对应的模型，并在此基础上建立了相应的预测模型集、子预测模型集、公共区域等概念。

At first, setting up the arith relation between the signal input and the signal output of the generalized multi-carrier system of the Discrete Fourier Test spread-spectrum; then setting equilibria parameters of the frequency field equilibria subcarrier of the generalized multi-carrier system of the DFT spread-spectrum according to channel frequency response, channel noise variance and equilibria method; then calculating average power of useful signal, interferential average power between signals as well as noise variance of the generalized multi-carrier system receiving terminal of the DFT spread-spectrum according to the arith relation as well as the frequency field equilibria parameter, and recomputing available signal information noise ratio, so as to calculate the available signal information noise ratio of the generalized multi-carrier transmission system accurately, the method for estimating the available signal information noise ratio can be used for link self-adapting transmission solution of the generalized multi-carrier system based on Discrete Fourier Test spread-spectrum and radio material management.

一种DFT扩频的广义多载波系统的SINR估计方法，其通过首先建立所述离散傅立叶变换扩频的广义多载波传输系统的信号输入输出之间的数学关系，然后根据信道频率响应、信道噪声方差和均衡方法，设定所述DFT扩频的广义多载波传输系统的频域均衡子载波的均衡系数，再根据所述数学关系及所述频域均衡系数分别计算所述DFT扩频的广义多载波传输系统接收端有用信号的平均功率、信号间干扰的平均功率以及噪声方差，再计算有效信干噪比，如此以实现对广义多载波传输系统的有效信干噪比的准确计算，该有效信干噪比估计方法可用于基于离散傅立叶变换扩频的广义多载波传输系统的链路自适应传输方案和无线资源管理方面。

Discrete breathers, which are spatial localized and time periodic, are very common nonlinear excited modes in discrete nonlinear systems.

北京师范大学，凝聚态物理，2009年，博士离散呼吸子是广泛存在于离散非线性系统中的空间局域、时间周期的非线性激发模式。

As for jump heighs there are some differences be-tween the continuous and discrete cases.In discrete case we introduce the empiricalscale codfficients to estimate jump heighs base on location estimators given by theabove method.

关于断点的跃度，在离散模型场合，通过引进样本的尺度系数并利用位置的小波估计可得到跃度的相合估计。

To increase the security of the watermark, a new binary image encryption algorithm based on TD-ERCS map is presented. The watermark is encrypted by a chaos sequence generated by TD-ERCS map; A novel color image watermarking algorithm is proposed based on discrete chaotic map and 2-dimensions discrete wavelet transform. The watermark is encrypted by the new binary image encryption algorithm, and the encrypted watermark is embed into four sub-bands of the most deep level of blue branch of host image by three-level wavelet transform, and the embedded positions are determined by general cat cha otic map; A novel color-image blind detection watermarking algorithm is proposed based on integer wavelet transform and subsampling. The scrambled watermark is encrypted and embed into the low sub-bands after four sub-images of the Y branch of host image is transformed by two-level wavelet transform, and the embedded positions are determined by Logistic chaotic map, this watermarking scheme can realize blind extraction.

为了提高水印图像的安全性，提出了一种基于TD-ERCS混沌映射的二值水印图像的加密算法，该算法利用TD-ERCS映射产生的混沌序列加密水印图像；将离散混沌映射和二维离散小波变换相结合，研究了彩色图像水印新算法，该算法先对混沌序列加密后的水印图像进行小波变换，再嵌入到宿主图像的蓝色分量的最深层的四个子带中，嵌入位置则由广义猫映射确定；将整数小波变换和图像子采样技术应用于数字水印，提出了一种彩色图像盲提取水印算法，水印嵌入时，先对宿主图像在YIQ色彩空间中的Y分量进行子采样，并对得到的四个子图像分别进行二级离散小波变换，然后将置乱并加密后的水印图像嵌入到小波变换后的低频子带中，其嵌入位置由Logistic混沌映射产生的混沌序列确定，实现了水印的盲提取。

The one-dimension discrete ordinates theoretical model, which is applied to study the characteristics of slowing-down materials used to construct the epithermal neutron filter at XPR, is for the first time developed in our country. The results show that the one-dimension discrete ordinates code ANISN is successful for studying properties of moderator.

其次，开发、修改了国际通用屏蔽计算程序ANISN，在国内首次建立慢化材料特性分析的一维离散坐标计算模型，研究了西安脉冲堆超热中子过滤器所需慢化材料的特性，结果表明，采用一维离散坐标程序ANISN来分析慢化材料的特性是成功的。

By detailed comparion, it is shown that false scattering and ray effect exact not only in discrete ordinates method, but also in zone method,discrete transfer method,etc,and the influence of false scattering and ray effect on solution accuracy of radiative transfer eqution

离散坐标法由于可以很方便地处理入射散射项，因此离散坐标法在计算有散射的辐射问题方面要优于现有的其它方法，且易与流动方程联立求解。

By applying the discrete vector Markov process method, a discrete time two-unit parallel repairable system with single vacation is studied in this paper.

以及首次故障前平均时间等可靠性指标。并通过具体数值实例展示了离散向量马氏链状态转移频度的具体计算方法。

A carrier gas such as nitrogen is directed through line 20 and valve 22 to connect with line 26 and mix with the gas sample.

如氮气之类的载体通过管线20和阀22引入，与管线26相通，与气体样品混合。

But for the most part, knaves and parasites had the command of his fortune

然而支配他的家产的大多是恶棍和寄生虫。