矩形

A key point in Short Time Fourier Transform is the choice of window function. Although rectangle window is regarded as the first choice because it's featured by integral harmonic to filter signals and by DC component, decaying DC component and frequency shift of signals cause great error to rectangle window STFT. In addition, transient signals contain rich information of faults, but the fixed time window of STFT fail to collect these information.

STFT 算法关键问题之一是窗函数的选择，矩形窗以滤除信号整数次谐波和直流分量的特点自然称为首选窗，但衰减直流分量和信号的频率偏移对矩形窗 STFT 造成了很大误差；其次，暂态信号中含有丰富的故障信息，傅立叶变换固定的频窗忽略了这些特征信息。

When n/n=0, the product is the mixture of h-WO3 (hexagonal system WO3) and WO3.1/3H2O, and have a morphology of nanorods; when n/n=0.5 or n/n=l, the product is γ-WO3, and have a morphology of rectangular flakes; when n/n=2, the product is β-WO3, with the same morphology of rectangular flakes.

当n/n=0时，产物为h-WO3和WO31/3H2O组成的混合物，形貌为纳米棒；当飞n/n=0.5和n/n=1时，产物为γ-WO3形貌为矩形片；当n/n=2时，产物为β-WO3，形貌同样为矩形片。

Construct an animation of a rectangle whose sides are tangent to a given ellipse/hyperbola.

建构一矩形的动态绘图。矩形的边是给定的椭圆或双曲线的切线。

3M i τi = 2 a i bi 3M i k = Ga i b i3 由后一式得 Gka i b i3 Mi = 3 60 Also Gk M =∑Mi = 3 i a i bi3 ∑ So we have: M a i b i3 = M 3 ∑ a ibi i Consequently we have:τ 3 Mb i = a i b i3 ∑ 3M k = G ∑ a i b i3 It is noticeable that: the shear stress of the midpoint of the long side of the narrow rectangle is considerably precise.

而 故有 Gk M =∑Mi = 3 M i a i bi3 ∑ a i b i3 = M 3 ∑ a ibi 从而有τ i 3 Mb i = a i b i3 ∑ 3M G ∑ a i b i3 k =值得注意的是：由上述公式给出的狭矩形长边中点的剪应力已相当精确，然而，由于应力集中的存在，两个狭矩形的连接处，可能存在远大于此的局部剪应力。

This paper takes advantage of interval algebra and rectangle algebra theories. and brings forward a new reasoning method based on combination of the MBR model's cardinal direction relation and rectangle algebra relation; And provides the composing method based on the direction relation matrix by using the direction relation matrix to denote the direction relations between the objects'MBRs.

本文以物体的MBR为模型，利用区间代数及矩形代数理论，提出了一种基于MBR的主方向关系与矩形代数关系相结合的推理方法；同时利用方向关系矩阵表示物体MBR之间的方向关系，得到了基于方向关系矩阵的组合推理方法。

In this paper,the absorption property of the left-handed material rectangular waveguide was studied by use of the perturbation method,and other novel properties were revealed.

采用微扰法研究了左手介质矩形波导的吸收特性。由于色散方程的限制，左手介质波导不能传输基模，它的吸收特性也与右手介质矩形波导明显不同。

It pointed out pass defect of current rectangular pipe designed by right angle method,raised obtuse angle design method of rectangular pipe pass.

针对现有方矩形管直角设计法孔型的缺陷，提出方矩形管孔型的钝角设计方法。

The major works in this thesis are: The effect of the straight and skew cracks on the vibration properties are studied for the cantilever beam, clamped-clamped rectangular plate, simple-supported rectangular plate and triangular plate. The effect on the natural frequency and vibration mode shapes of the bracket in the presence of cracks is discussed Based on the available index of crack diagnosis, a new index, is proposed.

本文主要的工作有以下几个方面：★研究了工程中常见的悬臂板、四边刚性固定矩形板、四边简支矩形板和三角形板的直裂纹和斜裂纹对振动特性的影响。

But what if arbitrarily divided regions of a rectangle are labeled with unique ordinal numbers?

但是，若将二维矩形平面任意分割成很多小的矩形区域，并以唯一的序号标记它们，情况会怎样呢？

The free vibration of a nonlinear elastic rectangular plate is explored, considering influence of material nonlinearity and static-load in plane on its dynamic characteristics. Exact solution to free vibration of each mode of the rectangular plate is obtained according to the fixed point theory of partially ordered space. So the whole process of free vibration is described.

对非线性弹性矩形板的自由振动进行了研究，考虑了材料非线性和面内静载对板动力特性的影响，并根据半序空间的不动点理论求得该矩形板在自由振动时各阶模态的精确解，描绘了其自由振动的全过程。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。