有限模型

This paper is concerned with finite difference solutions of a reaction-diffusion model in the transmission of human immunodeficiency virus.

中文摘要：本文针对一个艾滋病病毒传播过程中的反应扩散模型的有限差分解给出一些数值分析。

This article first introduces A finite impulse response digital filter of concepts and mathematical models.

本文首先介绍了有限冲击响应数字滤波器的概念和数学模型。

The isoscalar giant monopole resonance for finite nuclei and the nuclear matter incompressibility are studied in a consistent relativistic approach, which achieves a great success in describing the properties of nuclear ground states.

采用近来在研究核基态中极为成功的相对论模型研究有限核的同位旋巨单极共振，从而给出核物质的不可压缩性系数。

A three dimensional electrostatic field model which has an analytical solution unnecessary to be expressed by an infinite series is constructed. This model can be used to compare the accuracy of different methods.

构造了一个具有有限项解析解的三维静电场模型，为各种计算方法在三维静电场中的精度评估提供了可靠的依据。

In order to investigate the coupling characteristics between elastic deflections and rigid motions of the blades, the moderate deflection beam model was adopted to treat elastic deflections and two methods were adopted to treat rigid motions based on infinitesimal rotation and finite rotation.

为了研究桨叶刚柔耦合特性，采用中等变形梁模型处理桨叶弹性变形，分别采用小转角和有限转角两种方法处理桨叶绕铰的刚性运动。

Influence of simulation parameters on simulation precision of the springback, such as elements type, material types, constitutive equations, integral point selections, contact conditions, friction rules, and like that, has been analyzed.

分析总结了数值模拟中模拟参数（有限无算法、单元类型、材料模型、本构方程、积分点选取、接触和摩擦法则等）对回弹模拟精度的影响。

A boundary integral formulation describing constant-αforce-free field with finite energycontent in the semi-infinite space above the sun was proposed(Yan,1995), this formulationcontains boundary field and its normal gradient under integral sign.

颜毅华1995年在太阳物理杂志上发表一文，就太阳磁场提出了一个具有有限能量的线性无力场模型，并对磁场给出了一个边界积分表示公式，该公式用边界上的已知磁场值和未知的磁场法向导数值来确定空间任意点的磁场值。

Inverse M-matrices often occur in relation to systems of linear or non-linear equations or eigenvalues problems in a wide variety of areas including finite difference methods for partial differential equations, input-output production and growth model in economics, iterative methods in numerical analysis, and Markov processes in probability and statistics.

其中包括偏微分方程的有限差分法、经济中的投入产出和增长模型、数值分析中的迭代法以及概率论和数理统计中的马尔可夫过程。

The purpose of the model is to denote that the inverse U-shape relation is efficient to rebalance market and recover market liquidity in spite of having no professional liquidity provider.

根据模型的结论，我们预测在公共信息流冲击有限的条件下，当买卖指令出现极端不均衡时买卖价差最小，即市场失衡与买卖价差之间存在倒U型关系。

In chapter four the realtime integrated optimal operation of reservoir and canal irrigation systems under limited water supply is studied based on self-tuning adaptive control theory.

第四章基于自校正自适应控制的思想，研究了有限供水条件下水库与田间配水整合实时优化调度模型。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。