查询词典 invariance

A new method based on the Maximum Effective Circle is presented using the characteristic of the palmprint that the uniqueness and the invariance to the rotation can be obtained by obtain the datum point.

因此，本文在学习掌纹识别主要技术的基础上，重点分析研究了掌纹识别技术中的不变性特征提取技术，并利用掌纹识别技术具有可通过基准点对掌纹进行定义从而获得旋转不变性和唯一性的特点，在掌纹图像的不变性特征提取方面提出了一种基于最大有效圆的定位方法。

ABSTRACT The paper mainly studies the variable structure adaptive control theory for uncertain systems, and applicated the theory into the designs of bank-to-turn missile autopilots. The main contributions of the paper are as follows:(1) Under the condition that all the matched or mismatched parameter, input and disturbance uncertainties exist, a complete set of variable structure control system design and analysis method is proposed and investigated, which brecks throush the serious confines of variable structure invariance conditions theoretically and widen the application area of the VSC theory greatly.

本文着重研究了不确定性系统的变结构自适应控制理论，解决了目前变结构控制理论和自适应控制理论中存在且亟待解决的四个方面的问题，将获得的理论研究成果直接应用于倾斜转弯导弹的自动驾驶仪设计中，取得了很好的结果。

We prove that linear couplings may destroy the time invariance, and give the conditions for increasing intersections.

证明了线性耦合可以破坏映射的时不变性质，并给出曲线交点增加的条件。

They say that this disfavours certain theories of quantum gravity that postulate the violation of Lorentz invariance.

电荷随各种参照系变化吗？分数电荷都出现在那里？（2）有没有专家研究&电荷、电场的起源&？

The invariance property of the Krylov subspace is used to solve the large sparse complex symmetric linear system.

其中，利用Krylov子空间不变性求解离散得到的大型稀疏复对称线性方程组。

In this thesis, wavelet image denoising methods have been analysed, and the shift-invariance wavelets have been discussed.

本文对基于小波变换的图像去噪方法进行了深入的剖析，并针对具有平移不变性的小波进行了讨论。

By making use of the invariance properties of tensors , the disadvantages due to coordinates transformation are totally avoided.

采用张量形式，从HellingerReissner变分原理出发，建立一种列式杂交/混合有限单元的有效方法。

Characteristics and principles of time clustering and frequency with a seismic sequence of more 380 years (1615 —1998) are performed using fractal theory and rescaling range analysis theory. It is concluded that the fiactal dimensions of seismic subset are similar to each other, the mean value is about 0.405, and interval of scale invariance can change 1-2 magnitude order. It is also found that the Hurst index ranges from 0.5412 to 0.5580. The results show that there is of statistical self-similar among different magnitude earthquakes in the area of bridge site.

应用分形理论和R/S分析原理，编写了程序，分析和研究了桥址区的380多年（1615～1998）地震序列的地震时间从集和地震频度特征及规律，得出桥址区不同震级范围的子集合具有近似相等的分维值，约为0.405，子集合无标度区可跨1～2数量级；不同震级层次的地震频度Hurst指数为0.5412～0.5580，都表明了桥址区不同震级层次的地震之间具有统计自相似性。

In Higher geometry , one of important points is to study graphic invariance and invariant in terms of projective trans formation and the feafures of prime and combination are its main and constant oners.

在高等儿何中，它的一个重要内容是研究图形在射影变换下的不变性和不变量，而同素性和结合性又是它的主要不变性质。

As the contour of a wheel rim is easier to detect than the contour of a wheel, and the contour of a wheel rim and the contour of a wheel are approximately concentric circles on the same plane, we first detect the contour of the wheel rim, the center of the wheel rim and the contacting point between the wheel and the ground, then we detect the contour of the wheel via the invariance of cross ratio under projective transformation.

由于提取钢圈轮廓比提取车轮橡胶轮廓容易，而且钢圈轮廓和车轮轮廓可以近似看作同一平面上的两个同心圆，所以在本文中，我们首先提取钢圈轮廓、钢圈圆心和车轮与地面接触点在图像上的投影，然后利用射影变换保持交比不变的性质求出车轮轮廓。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。