查询词典 parabolic cusp

The existence of classical solutions to non-divergence quasilinear parabolic equation of second order has been proved by basic knowledge of non-linear functional analysis and implicit function theorem in banach spaces.

用非线性泛涵分析的基本知识和Banach空间上的隐函数定理证明了非散度型拟线性抛物型方程古典解的存在性。

This paper will discuss the solution of an initial value problem of parabolic type.

将讨论抛物型方程初值问题的解。

This paper includes three chapters.In chapter one, an initial value problem for pseudo-parabolic equation is considered.

本文内容共分三章：第一章对一类伪抛物型方程模型的初值问题进行了讨论。

On the other hand,Raymond considered systemsgoverned by linear elliptic and parabolic differential equations with the integrand in costfunctional has to be concave in the state variable.

在那里，指标泛函中的被积函数关于状态变量必须是凹的。因而，那里所给的条件和Cesari条件是互不包含的。

In the ***, all types and fundamental principles of Radon transform are summarized systematacially. This *** starts from the general linear Radon transform, and then researches how to use the damped least square method to find the solution of the forward transform. However, the least squares smoothing effect will lead to a certain degree of trails in the data of Radon domain, which led to the application\'s limitations. After that the implementation in Radon domain and relative merits of linear Radon transform, parabolic Radon transform and polynomial Radon transform which have time invariance are introduced, the conjugate gradient method that can solve numerical solution is also given. And then the high resolution Randon transform is discussed, it introduces the regularization theory and Bayes principle into inversion, which successfully remove the negative affect caused by discrete Radon transform. Finally, we introduce the optimal weighting similar coefficient Radon transform, which adapt to the time variant quality of hyperbolic Radon transform.

本文系统总结了Radon变换的各种类型及其基本原理，从τ- p变换(即一般线性Radon变换)出发，研究利用阻尼最小二乘平方法求解其正变换，但是最小平方法的平滑作用会导致Radon域数据存在一定程度的拖尾效应，给这种方法的应用带来了很大的局限性；然后先容了具有时不变性的线性、抛物和多项式Radon变换在频率域的实现及其优缺点，给出了求解其数值解的共轭梯度算法；接着讨论了高分辨率Radon变换，它把正则化思想和贝叶斯原理引进到了反演中，很好的克服了离散Radon变换产生的截断效应对结果的不利影响；最后先容了适应双曲Radon变换时变性质的高分辨率最优相似系数加权Radon变换。

The results show that the oxide process follows parabolic kinetics at 600, 700, 800 ℃ for 180 min.

结果表明，分别在600、700、800 ℃氧化180 min的过程基本遵循抛物线规律。

Mainly include: automatic, single, double-sided polishing machine, horizontal polishing machine, hydraulic surface polishing machine, hydraulic automatic single, double Grinding, Vertical Grinder Cutlery steak knife grinding machine, such as a total of three categories 18 mechanical grinding parabolic varieties.

主要有：自动单、双面抛光机、横向抛光机、液压曲面抛光机、液压自动单、双面磨刀机、立式刀剪磨床、牛排刀磨齿机等共三大类18个品种的抛磨机械。

In the paper, on the basis of aggregation of previous studies, the development of optical technology and development trends at home and abroad are introduced, the principle of Fresnel lens is summarized. In accordance with its principle, circle equidistant steps Fresnel lens design is described. And on this basis, based on Fresnel design, also based on a continuous upward spiral of the plane curve concept, incidence surface and the backlight is set up to greet Archimedes - Fresnel lens design formula and the Second parabolic type Fresnel lens design formula, and on this basis, the advantages and disadvantages of the three designs is discussed.

本文在充分了解非球面光学技术在国内外的发展状况和趋势的基础上，同时从菲涅尔透镜的光学原理出发，并根据它的工作原理推导了圆环等距菲涅尔透镜的设计步骤，并在此基础上依据菲涅尔的设计思想，同时依据平面曲线的连续又呈螺旋的构思，推导出了迎光面和背光面阿基米德型菲涅尔透镜的设计公式和二次抛物面型菲涅尔透镜的设计公式，并在此基础上讨论了这三种设计各自的优缺点。

In chapter 1, a difference scheme of some two-dimensional linear pseudo-parabolic equation is concerned.

第一章中讨论了二维线性伪抛物型方程的差分格式。

Flow characteristics are linear, parabolic two.

流量特性有直线、抛物线两种。

This is the webpage of Journal of Cutaneous Medicine and Surgery.

这是《皮肤医学和外科学杂志》的网页。

Difficult to penetrate or understand; recondite

难以理解的；不易懂的