surface approximation

The error of kriging and polynomial response surface models for approximating car door side impact response is contrasted. The research shows that kriging is presented as an alternative method for constructing car door structural crashworthiness approximation.

对比分析Kriging和多项式响应面两种近似模型对于车门侧撞响应的拟和误差，表明用Kriging模型构建车门抗撞性近似模型是合适的。

Using the three dimentional conformal mapping and a approximation of finite expansion of spherical harmonics, the potential field data in an arbitrary surface are projected to level plane.

本文采用三维保角映射和有限球谐展开方法，将非水平观测面上的位场数据，延拓到同一水平面上。

A plane surface approximation method for image coding and its quad tree scheme are presented in this paper.

该文提出了一种平面逼近图像编码方法及其四叉树实现方案。

Quad tree plane surface approximation method for image coding

图像的四叉树平面编码

In this paper the physical acoustic method ( the Kirchhoff's approximation) is extended to treat the scattering of a nonrigid surface in order to estimate the target strength of tar-gets with absorbing coatings.

本文将物理声学方法（Kirchhoff近似）推广到非硬表面的情况，以解决带有吸声覆盖层的目标的目标强度计算问题。

In feature based reverse engineering, surface reconstruction based on sectional curves and surface approximation has been broadly and deeply investigated. A feature based reverse engineering CAD modeling theory has been formed.

在基于特征的反求工程中，基于截面数据的曲面重建技术和基于特征曲面逼近的曲面重建技术已经有相当广泛和深入的研究，形成了比较完整的反求工程CAD建模理论。

By the continuity equation and the momentum equation for an ideal incompressible fluid, this essay derives the fundamental equations of surface water wave and works out an analytical solution under the condition of small-amplitude via the linear approximation theory.

利用理想不可压缩流体的连续性方程和动量方程，推导了表面波基本方程，并应用线性近似理论求出了小振幅波情况下的解析解。

Based on effective medium approximation and fractal theory for describing nanoparticle clusters, a model for predicting effective thermal conductivity of "nanofluid" is established considering particle size effect and particle surface adsorption.

运用有效介质近似与分形理论描述纳米颗粒团聚体空间分布，同时考虑颗粒尺寸效应及表面吸附作用，建立起纳米颗粒悬浮液有效导热系数预示模型，结果与实测数据相符。

In this paper, using the PLK method and reductive perturbation method, we obtained the second approximation to cnoidal waves at the free surface and interface for the two-fluid system considered in [ 1].

本文考虑[1]中所建立的模式，采用约化摄动法及PLK方法，求得了自由面及界面上的二阶椭圆余弦波。

The internal and surface cracks in rolls were detected with magnet as exciting source. Quantitative detection of cracks was realized by the establishment of mathematical model according to magneton theory and quantitative analysis of crack signals based on the piecewise cyclic approximation of neural network.

以磁为激励源进行轧辊表面及内部裂纹缺陷的检测，基于磁荷理论的裂纹数学模型的建立和神经网络的分段循环逼近的裂纹信号定量分析，实现了裂纹无损定量检测。

From the radiative transfer equation, the analytic results of diffuse reflectance on tissue surface are deduced by diffusion approximation for both the time dependent and the continuous wave source under the condition that a narrow collimated light beam is normally incident upon the surface of tissue.

从光的传输理论出发，利用漫射近似方程，推导出当无限细脉冲光及连续光束垂直入射到生物组织表面时，生物组织表面漫反射光随空间及时间变化的解析表达式。