离散化

Using the characteristic line theory of hyperbolic partial differential equations,relations between the reflected signals and the dielectric parameters of the stratified media are analyzed.

提要 本文根据双曲型偏微分方程的特征线理论分析了分层媒质参数与时域反射信号的因果关系，研究了基于时域反射数据的分层媒质的参数反演的离散化模型。

The hypersurface expression and the way of hypersurface obtained by support vector machine are given. The method is applied to the support of Air Force air materiel, and the result shows that more simple decision rules can be obtained.

文中提出了一种超曲面的离散化方法，给出了超曲面的表示方法，提出了基于支持向量机的超曲面寻优，并将这种方法应用于空军器材保障中，仿真结果表明，提出的超曲面方法可以获得更为简捷的决策规则。

A digital image processor is the heart of any image processing system.

数字图像是立体坐标和亮度被离散化的图像。

The paper approaches the inapplicability of analysis method to the two above-mentioned mathematical models by using dispersed demoted numerical virtue method.

针对两个数学模型难以用解析法求解的情况，采用离散化数值求解方法进行。

Since fast algorithm for multiwavelet decomposition and reconstruction are crucial steps inapplication,discretion form of multiwavelet is obviously necessary.This dissertation makes asuccessful exploration in this aspect,synchronously designs a new pre-filter method for multiwavelet,and gives evaluation regulations of pre-filters for different objects.These research results providereliable guarantee for exploration and study of multiwavelet application.

由于向量小波的分解、重构快速算法在应用中是必不可少的重要环节，故必须给出向量小波的离散化形式，本文在这方面做了成功的探索，同时还设计了一种新的向量小波的预滤波器，并给出了选择适合于不同对象的预滤波评判准则，这些研究成果使向量小波应用潜力和应用前景的拓展有了可靠的保证。

Based on integral formula, discrete second electrical field is expressed as a sum of elementary contributions coming from charges accumulated on the surfaces of resistivity discontinuity.

基于地下电流场的积分公式，离散化的二次电流场被分解为电性不连续界面上的一系列点电荷电场的代数和。

Based on a chosen normalized boundary equation, a new normalized boundary equation can be established such that the irregularity of the kernel of integral equations is overcame. Finally, natural frequency is obtained by the existence condition of nontrivial solution of the discrete algebraic equations derived from the integral equations.

边界方程有多种选择，在选定一种边界方程的基础上，可以通过建立一个新的边界方程来表示问题的边界，以克服积分核的奇异性；最后由积分方程的离散化方程组有非平凡解的条件，求得固有频率。

On the other hand this dissertation develops a numerical model to calculate the Q-V characteristics of fast impulse corona, which is based on the relation to the interelectrode voltage, density of space charge and field intensity in corona region.

在计算方面，给出了冲击电晕特性的计算模型，该模型以电晕电极周围的电场强度、空间电荷密度与极间电压之间的宏观联系为基础，从时间和空间上将电晕发展过程离散化，可计及多层不同极性空间电荷的产生与变化，模型的待定参数由若干实测数据加以拟合。

An objective interestingness function of rule is given.

讨论了数量关联规则提取过程中的连续属性离散化方法和规则的有趣性问题，给出了数量关联规则的客观兴趣度的度量函数，提出用模板匹配方法挖掘用户感兴趣的规则，以解决数量关联规则有趣性的主观评测，研究了一种挖掘支持度和兴趣度最优的形如(A∈ [v1 ，v2 ]∧ C1 ) C2 (其中 A为连续属性，C1 、C2 为类别属性)的数量关联规则方法，并将该方法应用于股市行情分析，实验结果表明是非常有效的。

Further, in order to reconstruct flow real-time image, inverse problem is transferred to a linear system of equations by simplification based on reasonable suppose, which solves the technical problem of data processing and flow image reconstruction.

再之，根据图像重建实时性要求，通过简化反问题并将之转化为离散化线性问题，解决了测量数据处理和流动图像重建的方法技术问题。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。