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Three classes of equivalent system methods which are used in finding high order flight control systems low order equivalent are studied. The first class methods are the classical frequency domain-based equivalent system methods which recommended by MIL-F-8785C and MIL-STD-1797A. Five longitudinal low order equivalent systems and fourteen lateral ones are discussed in detail and some pieces of advice are given. Also conduct an investigation in the time domain-based equivalent system methods .

研究了求取高增稳飞机的低阶等效系统的几种方法：研究了经典的频域等效系统方法，针对纵向5种、横向14种构型的低阶等效系统进行了拟配实践，并提出一些有益的看法；以频域等效系统方法为基础，提出了时域等效系统新方法；以最小二乘辨识为基础，提出了两种纵向短周期低阶等效系统时域辨识方法(等效延迟时间τ_q参与或不参与)。

WS, the global solution for Internet addresses with the .ws top-level domain, closed a deal with a large publicly traded company, one of the biggest players in the .com arena, and received payment in full of $2,250,860 for the rights to a select group of "premium".ws domain names.

WS ，全球互联网地址的解决方案的。是的顶级域名，关闭了处理大型上市公司，其中一个最大的球员。 com舞台上，并在收到付款充分的二百二十五点零八六万美元的权利，以一组选定的"溢价"。为域名。

Modal analysis of an acoustic system can determine its natural frequency and show the distribution of the acoustic quantities in space, give the knowledge about the way that the acoustic system responses are affected when changes are made in the excitation sources or in the domain geometry, and provide valuable information for the noise control of closed three-dimension domain.

通过对声学系统的模态分析，可以得到其固有频率以及在此频率下声学量在声场空间上的分布，了解到声源及声场空间几何参数的变化对声学系统的相应的影响，为三维封闭空间的噪声控制提供了依据。

In the discrete wavelet transform domain, the watermark information is embedded by quantifying the coefficient of the transform domain andthe watermark can be extracted without the original audio.

在离散小波变换域水印嵌入算法中，本文给出了小波变换域系数均值量化的水印嵌入方案。

In the discrete wavelet transform domain, the watermark sequence is modulated with m-sequence at first, then the watermark information is embedded by quantifying the coefficient of the transform domain. The quantification procession is given.

4在离散小波变换域，先对水印序列进行扩频调制，然后通过对变换域系数进行量化来嵌入水印信息，给出了量化方案；在水印的提取过程中不需要原始音频信号的参与。

In the discrete cosine domain, the watermark is embedded by quantifying the coefficient of the dct domain, spectrum-spread is applied. the watermark can be extracted without the original audio.

在离散余弦变换域，采用扩频技术通过对变换域系数进行量化来嵌入水印信息，在水印的提取过程中不需要原始音频信号的参与。

Hi the discrete cosine domain, the watermark is embedded by quantifying the coefficient of the DCT domain and the quantification procession is given; the watermark can be extracted without the original audio.

3在离散余弦变换域，通过对变换域系数进行量化来嵌入水印信息，给出了量化方案；在水印的提取过程中不需要原始音频信号的参与。

In the discrete cosine domain, the watermark is embedded by quantifying the coefficient of the DCT domain and watermark can be extracted without the original audio.

在离散余弦变换域中如何嵌入数字水印，会具有较好的脆弱性和透明性。

A new method based on subtractive image segmentation for weighted image fusion is put forward from another viewpoint. It adopts the improved particle swarm optimization to calculating the segmentation threshold of subtractive image and the corresponding weighted fusion coefficient in space domain or in wavelet decomposition domain. Moreover, it doesnt need to construct the eigenspace and quantitative eigenvalue for the weighted fusion coefficients.

本文从另外一个角度提出了一种基于差值图像分割的加权图像融合方法，它采用改进的粒子群优化方法在空间域或小波分解域求解差值图像的分割阈值和对应的加权融合系数，而不需要为计算融合系数而构造特征空间和定量特征关系。

AVO analysis is suggested for solving to solve the difficulty in identification of thin alternating layers in exploration of oilfields. It can improve the current method that has no thickness variable in the formula of reflective and is limited by sampling rates in calculation of the coefficient in the time of domain. Using the relationship of stress and displacement on two interfaces, this paper derives the spectrum of reflective coefficient for any incidence angle and thiekness of thim layer based on the equation of seismic wave propagation in the frequency domain.

针对油气田开发中薄互层认识难的问题，提出从AVO分析解决困难，克服现有方法在反射系数公式中无厚度变量、时间域计算反射系数谱受采样率限制的不足，运用两个界面间位移与应力关系，从频率域地震波传播方程推导了任意入射角和薄层厚度下的反射系数谱。

When I was in Beijing earlier this year, the Chinese authorities seemed to be genuinely fearful of social unrest, if they were unable to keep the economy growing at double-digit rates.

我今年早些时候去北京时发现，中国政府官员似乎真的担心，如果不能维持两位数的经济增长，将出现社会动荡。

Its whistle shrilling, the train was passing over an iron bridge. The door handle, the steel floor and their shoulders were bouncing with the motion of the train.

列车正轰鸣着开过一架铁桥，车门上的把手、铁踏板和乌蒙蒙的玻璃窗都在震响着，他们的肩头也在随着晃动着。