查询词典 parabolic

Many methods, including difference methods,collocation methods and standard finite element methods for singular parabolic equations have been proposed and analyzed ,and some good results have been obtained.

但利用非标准有限元方法，对奇异微分方程进行研究的文章迄今很少见到。时空有限元法将时间和空间两个变量统一起来，在时间和空间两个方向上同时发挥有限元的优势，实现时间和空间两个方向的高精度。

Then,graphs of daily average solar beam radiation for every month have been plotted in this paper.By comparing and researching the data and graphs,two kinds of compound tracking modes for the parabolic-trough reflector are obtained.

通过对所得数据及曲线图的比较和研究，获得了聚光反射抛物镜面两种较好的组合跟踪方式，效率分别达到双轴跟踪的98.9%和99.34%。

Next year will be on coal, ore spodumene, bromamine, tellutide and other energy resources; foudamental acid oil plants of raw materials, tetaining solar parabolic reflector as environmental protection equipment and parts of the implementation of a lower rate of tax on imported tentative; continue to crude oil, wood pulp, ferrolloy, steel billet, part of the assets'protection, such as energy consumption on the environmental impact of large exports tentative tax rate.

明年将对煤炭、锂辉石矿、溴、碲等能源资源类产品，植物酸性油等基础性原材料，槽式太阳能抛物面反射镜等有利于环境保护的设备及零部件实施较低的进口暂定税率；继续对原油、木浆、铁合金、钢坯、部分钢材等资源性、生产能耗高、对环境影响大的产品实施出口暂定税率。

The standard parabolic equation method was obtained by the decompocition of the scalar wave equation and the expansion of the pseudo-differential operator.

通过对传统波动方程的分解和伪微分算子的近似展开，获得了标准抛物线方程。

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Hybrid Dynamic; time-varying systems; finite horizon; optimal control; Quasi-Variational Inequality; viscosity solution; lower semicontinuous solution; uniqueness; Dynamic Programming; Viability Theory; inventory systems; mathematical model; proximal subdifferential; parabolic equation; nonlinear boundary

基础科学，数学，控制论、信息论混合动态；时变系统；有限时间；最优控制；拟变分不等式；粘性解；下半连续解；唯一性；动态规划；生存定理；库存系统；数学模型；邻近次微分；抛物型方程；非线性边界

The topology analysis of vector field around "a singular point" is refered in the study of the topology of three-dimensional symmetric tensor field around a simple degenerated point, which can be classified into three types of hyperstreamline sectors:"hyperbolic sector","parabolic sector" and "elliptic sector".

本文参考矢量场中"奇点"附近的矢量轨迹分布结构，研究了张量场中"退化点"附近的特征向量分布形态。确定了"退化点"附近"超流线体"轨迹的三种形态。"抛物扇区"、"双曲扇区"、"椭圆扇区"及其这些扇区的边界。

Mathematically, the miscible displacement of one fluid by another in a porous media is governed by a nonlinear coupled system of two partial differential equations, one of elliptic form for the pressure and the other of parabolic form for the concentration of one of the fluids.

数学上，多孔介质中一种不可压流体对另一不可压流体的相溶驱动由两个耦合的非线性偏微分方程描述。其中一个是关于压力的椭圆方程，另一个是关于浓度的抛物方程。

Common examples include solid linear brick and solid parabolic tetrahedral elements.

常见的例子包括固体线性抛砖和固体四面体组成部分。

Disadvantages include generation of huge models, generation of distorted elements, and, in 3D, the use of the rather expensive solid parabolic tetrahedral element.

缺点包括代巨大的模型，新一代的扭曲因素，并在三维，使用相当昂贵的固体抛四面体元素。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了