查询词典 parabolic partial differential equation

Based on the surjection of maximal monotone operators, we prove that some semilinear heat equations with weak Lipschitz nonlinear terms are exactly controllable by L〓 0, T: H〓(Ω control; Based on the critical point theorem of coercive convex functionals, we prove that some parabolic equations with Lipschitz nonlinear terms are globally approximately controllable and finite-dimensional exactly controllable by controls acting on mobile supports, and finally, we extend the results to parabolic equations in R〓.

首先利用极大单调算子的满射原理证明了半线性热方程在较弱Lipschitz条件下可通过L〓0.T；H〓(Ω控制实现精确能控。然后通过构造强制凸泛函并利用其临界点理论证明了带Lipschitz非线性项的抛物型方程可通过作用在在移动支集上的控制来实现整体近似能控与有限维精确能控，最后将整体近似能控与有限维精确能控结论推广到无界区域R〓上。

Since the analytical solution was derived under the condition of an-infinitely wide slope, the shape of parabolic sections of general grassed channel needs to be considered. This work uses the results of Hey (1979) to build the shape factor, which can be used to design a grassed channel with a parabolic section.

但因其解假设条件为无限宽敞的渠道，而一般草沟设计则常用抛物线形断面，本研究用Hey(1979)找出修正形因子之系，可应用於设计草沟之水分析。

Introduction 引言 The problems that occur while illuminating shallow offset parabolas, in addition to those related to the efficient use of parabolic generally, are additionally aggravated by the specific geometry of the parabolic mirror itself.

这个问题时常存在于浅照射的偏馈抛物面天线上，除了和抛物面天线的效率有关之外，抛物线反射面本身的具体几何形状又使之更加严重。

Are set processing, production and sales of integrated enterprise, Main specifications of the dual-head models to stay plate Plum wrench, dual-purpose wrench (semi-parabolic / wide parabolic), active wrench (Zhanhua Plastic / Phosphating / calibration / chrome), a full range of instrument sets sleeve, the sleeve head, then a long shot, short take-under, ratchet wrenches, Freedom Next, slide the first handle rod afterburner, universal joint, the two sides bend Handle, Express±ú, large sliding head, curved handle, L-type wrenches, tire sleeve, saw blade, circular saw blades and other products, high-quality carbon steel and medium carbon steel.

山东世达机械工具有限公司是集加工，生产，销售为一体的综合性企业，主营各种规格型号的双头呆扳梅花扳手、两用扳手、活络扳手（沾塑/磷化/刻度/镀铬）、全系列套筒组套工具、套筒头、长接杆、短接杆、棘轮扳手，自由接、滑行头手柄、加力杆、万向接头、双方弯柄、快速摇柄、大滑行头、弯柄，L型扳手、轮胎套筒、锯条、圆锯片等一系列产品，产品选用优质中碳合金钢和中碳钢。

An example of existence of antiperiodic solutions for 2m - order quasi-linear parabolic differential equation is presented.

最后，举例说明理论结果在2m阶拟线性抛物型方向的时间反周期问题中的应用。

Parameter τ＇(ratio of lag time of diffusion process to relaxation time of polymer) can define the form of the differential equation: hyperbolic or parabolic.

参数τ＇（扩散的瞬态过程引起的滞后时间与松弛时间之比）的存在与否决定了方程是双曲型还是抛物型。

Neutral type ; quasilinear ; parabolic differential equation ; systems ; oscillation

中立型；拟线性；抛物微分方程；方程组；振动

Afterwards, the solving problem of Parabolic Type is transformed into a initial value problem of ordinary differential equation with respect to through Fourier transform again.

在数值实验中，对六个美式看跌期权价格进行了计算，通过分析比较，结果表明：快速傅里叶变换法加欧拉法是一种快速的高精度的数值计算方法。

Wideangle parabolic approximations to wave equation usually lead to nonconstant differential migrators with their coefficients varying with lateral velocity variations, and hence require a finitedifference numerical implementation.

波动方程宽角抛物逼近得到的通常是非常系数的单程波传播算子，其系数是速度横向变化的函数，因此需要利用有限差分进行数值实施。

In chapter two ,we consider the Expanded Mixed Finite Method for the following quasilinear parabolic integro-differential equation.

在本章中我们给出了拟线性抛物问题的混合体积元的变分形式，并利用该方法得到了其真解与离散解的最优L~2模误差估计。

Researches reveal that students who suffer from corporal punishment tend to resort to violence in their future life.

研究表明遭受过肉体惩罚的孩子倾向于在他们今后的人生中使用暴力。

Total sugar of sarcocarp and chlorophyll of pericarp increased firstly, and then decreased afterward along with altitude; Titratable acidity, ascorbicacid and anthocyanin of pericarp were increased along with altitude; The content of protein increased firstly and decreased afterward along with altitude; Carotenoid of pericarp were decreased along with altitude.

果肉总糖和果皮叶绿素含量随海拔高度升高先升高后降低；可滴定酸、维生素C和果皮花青苷含量均随海拔升高而升高；蛋白质在1720m处最大，1420m处最小；果皮类胡萝卜素随海拔升高而降低。