查询词典 gradient

In this paper, a new edge detection method——method using extremum of first directional derivative is proposed, based upon a general gradient edge model.

文中通过傅里叶变换，在频率域，通过求垂直于边缘的一阶方向导数，并检测其极值点来确定边缘。

In the new method proposed, gradient direction is not directional derivative but optimized result of chaos search in local area.

该方法先在局域内用混沌优化搜索局域最优点，再将此最优点作为梯度方向，通过改变局域范围跳出局部寻优区域。

The intensity gradient of image is in the direction that the shape of surface changes most, so we use directional derivative of the reflectance map as parts of objective function.

混合反射模型比漫反射或镜面反射更加接近实际。图像的梯度方向对应物体形状变化最快的方向。因此构造了含有图像梯度信息的目标方程。

We get theexistence theorem of directional derivative of convex fuzzy mapping, and discuss the relationsamong directional derivative, differential, gradient and subdifferential.

得到了这类模糊映射的凸映射的方向导数的存在性定理。

On the fuzzy number valued mapping F:〓→〓, we put forward the definitions ofdirectional derivative, differential, gradient and subdifferential, and with the "cut method" byusing respectively the directional derivative and differential of two crisp functions that aredetermined by F, characterize the directional derivative and differential of F.

对于模糊映射F：〓→〓，提出了方向导数，微分，梯度及次微分的概念，并通过取截集，用由F所完全确定的通常函数的方向导数和微分分别刻划F的方向导数和微分。

The maximum principles for functions which are defined on solutions of semilinear elliptic equations u+f=0(q=|u|~2)subject to Dirichlet boundary conditions u=0 were studied by using Hopf s maximum principle,the estimate of gradient q was obtained.

运用Hopf 极值原理讨论了一类具有Dirichlet边界条件u=0的半线性椭圆方程Δu+f=0(q=|u|2)的解的某个函数的极值原理，利用该结论获得了解的梯度q的估计。

This paper is devoted to the existence and multiplicity of the solutions of the homogenous Dirichlet problem for a nonlinear singular elliptic equation with natural growth in the gradient.

研究一类具奇性和退化性的非线性椭圆方程Dirichlet问题，通过构造适当的逼近问题并结合紧致方法，证明了解的存在性和多重性。

In this thesis,we study the existence and the regularity of positive classical solution and the existence of the large solutions for a singular semilinear elliptic Dirichlet problem and a semilinear elliptic value problem of second order with gradient terms.

本文研究一类奇异半线性椭圆型方程的Dirichlet问题正的古典解的局部存在性及其正则性以及一类含对流项的二阶半线性椭圆型方程爆破解的局部存在性。

And among regions around the price of land is not necessarily continuous gradient, the premium rate changes in an enclosed space is not continuous, and even in space in some provinces and cities may have a discrete distribution of land, but on the whole, the East West low, South high-low trend of the North exist.

和各地区的土地价格并不一定是连续梯度的保险费率的变化在一个封闭的空间不连续，甚至在太空中的一些省份和城市可能有一个离散分布的土地，但就整体而言，东方西低，南高，低的趋势北方存在。

Since the dismutation of superoxide radicals by SOD is a reaction that is rate-limited by diffusion and enhanced by electrostatic guidance, all these structural features may be related to GP-MnSOD's high catalytic activity: first, Lys38 may increase the effective enzyme-substrate association rate by enhancing the electrostatic gradient at its substrate channel; second, an excess of acidic over basic residues makes the negative surface potential of GP-MnSOD more larger than those of other known MnSODs. This may enhance the reaction rate by reducing futile collisions of superoxide radicals with GP-MnSOD's surface.

因此，GP-MnSOD的上述结构特征可能与GP-MnSOD的较高酶活有关：首先，Lys38增加了底物通道口的正静电势梯度，从而可能促进了GP-MnSOD的活性中心与底物的有效结合速率；其次，GP-MnSOD表面覆盖的过量酸性残基使得它比其它MnSOD在底物通道以外的蛋白表面更多地被负静电势所覆盖，这可能有效地减少了超氧阴离子与GP-MnSOD表面的无效碰撞，从而提高了反应速率。

Continuously improve the production mechanism, to provide customers with better quality products and services.

不断的完善生产机制，给客户提供更优质的产品及服务。

B:Yes, he was the very prize-winner in the court tennis ten years ago?

是的，他是十年前的世界网球冠军。