查询词典 parabolic partial differential equation

According the experiential formulas of headbox to design the stepped diffuser headbox's geometry parameters. Supposing Paper suspension flow as potential flow and basing on hydrokinetic and computational fluid dynamics theories, we can solve the elliptoid partial differential equations which are followed by the flow functions and the potential functions by finite element method and simulate the flow's speed distribution with pde toolbox of matlab software. The simulate results and the flow analysis have good precision.

按照流浆箱的经验设计公式，设计阶梯扩散式流浆箱的各组件几何参数，以流体动力学、计算流体力学等理论为基础，假定浆流的流动为势流，采用有限元法求解浆流流动时其流函数和速度势函数所符合的椭圆型偏微分方程，应用matlab软件的偏微分方程工具包pde toolbox，模拟出所设计的流浆箱各组件内的浆流的流场流速分布，模拟结果与数值计算流动分析结果吻合。

Twenty three samples were apparently classified into 4 groups by partial least square-discriminant analysis. A brief list of 20 differential compounds is presented, including cnidilide, 3-n-butylphthalide and butylidene phthalide.

结合偏最小二乘法-判别分析，可以很好地将4个产区的挥发油样品加以区分，并找出20种差异最大的化合物，其中包括4种苯酞类物质。

Key words:Spectral and pseudospectral approximation,incompressible fluid flow,un-bounded domain,nonlinear partial differential equations.

本文的主要方法与技巧对无界区域中的其它偏微分方程同样适用。关键词：方法谱与拟谱逼近，无界区域，不可压缩流，非线形偏微分方程。收敛性和稳定性

Aslak Tveito and Ragnar Winther,Introduction to Partial differential Equations: A Computational Approach,Springer ...

这门课程将将微分方程的理论、数值逼近和相关的应用结合在一起讲述。

The unstationary heterogeneous model, consisted of a set of partial differential equations, was obtained by mass and heat balances of both gas and solid phases in large scale reactors with a series of simplication supposition.

首先，以工业反应器为建模对象，在一系列基本假设的支撑下，通过反应器微元内两相的质量衡算和热量衡算，得到由偏微分方程组构成的、流向变换强制周期操作二氧化硫催化氧化反应器的非定态非均相模型。

It is proved that the high frequency voltaic sensor and improved differential system and pulse polarity discriminating system can meet the requirement of partial discharge on-line detection system.

通过模拟实验证明，论文所设计的传感器和抗干扰系统配合使用能够提高检测系统的检测灵敏度和抗干扰能力，满足了在线检测系统的设计要求。

The subject of partial differential equations, which had its beginnings in the eighteenth century, burgeoned in the nineteenth

诞生于十八世纪的偏微分方程这门学科，在十九世纪发展起来了。

Partial Differential Equations and Complex Analysis explores the background and plumbs the depths of this symbiosis.

偏微分方程和复分析探索这种共生的背景和铅锤最深处。

The article introduces two arithmetic of partial differential,and analyses the method of using compare the current vector of coupler breaker,and provides sampling arithmetic and vector arithmetic.

母线微机保护装置已发展的比较成熟，装置通用的选择故障母线的方法是利用总差动和分差动相配合；文中介绍了利用分差动选择故障母线时的两种算法，分析了利用母联电流方向比较元件选择故障母线的方法，并从瞬时值方面和向量值方面提供了两种算法。

Since partial differential equations were used to describe biological regulations and phenomena, many scholars and specialists have been paying more attention to PDE and many new subjects have been established which have more reality backgrounds, one of which is chemostat model.

自从偏微分方程被用来描述生物学中许多生物规律和现象以来，一直吸引着大量的专家和学者的注意力，并形成了许多具有很强实际背景的新模型，chemostat模型就是其中之一。

I was up all night because I was in pain, she said.

我整夜，因为我在疼痛，她说。

A crow caws /craoks.

乌鸦叫。 51-论文网