查询词典 mathematical models

Through the study above, a refined description and modeling to flow field and water surface near the groyne in river is conducted with 2-D and 3-D mathematical models. The results by simulation are consistent well with experiment data.

通过上述研究，作者采用二维和三维数学模型对水槽试验和天然河道中丁坝附近流场和水面形态进行了精细地描述和模拟，计算结果和实测结果吻合良好。

The mathematical models of power systems are DAEs of index one, which may have impasse points.

电力系统的数学模型一般是指数为一的DAE，可能存在障碍点。

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 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。

By statistics and sample data, and taking the speedometers of Shanghai Santana LX cars as the target, the test values were statistically analyzed to get the distribution parameters and to establish the corresponding mathematical models. From this study, the statistic rule of the indicatory error could be well known. It is beneficial for safe drive and is significant in improving the design of the speedometer.

本文运用数理统计工具及样本实测数据，选取上海桑塔纳LX轿车车速表检验值进行统计规律研究，给出其分布参数，建立相应数学模型，指明其误差情况，对于深入了解轿车车速表指示误差统计规律，保证车辆的行驶安全性，改进车速表设计均具有十分重要的意义。

The simulation results are all compared with experiment data and they inosculate nicely, which validates the mathematical models developed.

将模拟结果与实验数据进行了比较，两者吻合很好，进一步验证了所建模型的可靠性。

To solve the problem of designing a photovoltaic power system theoretically and reasonably, the process of pretreatment upon the raw radiation data is discussed in details and the mathematical models for calculating the insolation on a tilted surface are developed.

本文提出了对原始辐射数据的处理方法，给出了倾斜面辐射量计算的数学模型，推导了太阳电池方阵在不同运行方式时倾角和入射角的数学表达式，提供了电源系统设计的基本步骤和计算机程序框图。

The research achievement are acquired as follows: 1From mathematical models for inverse scattering in two dimensional homogenous media including Dirichlet, Neumann, Robin,all kinds of probable mixed boundaries and cracks, direct and inverse scattering are discussed, and ill-posed integral equation and indicator function method are formulated for the diverse of boundary identification. It is shown that the kernel of the integral equation characters the boundary of scatterer, which is determined by solving it by virtual of regularity method, meanwhile, some numerical tests are given.

本研究取得了如下研究成果： 1）在二维均匀介质逆散射各种边界识别的数学模型（包括Dirichlet，Neumann，Robin，各种可能的混合边界问题，裂纹问题）下，分别考虑了正散射问题和逆散射问题，推导了上述各种边界识别的不适定积分方程以及指示函数方法，由于积分方程的核充分表征了散射物的边界，由此说明只要利用正则化方法求解该积分方程，就可以确定散射物的边界，并给出了一些数值实验。

In the study, calculation of two types of liner wear types based on the direction of liner wear and wear depth of the changes are studied. Mathematical models in terms of vector integral to calculate the liner wear volume is derived first.

本研究计算两种型式内衬之磨耗体积，依据内衬磨耗方向与磨耗深度的变化建立数学模型，并且使用向量积分计算内衬之磨耗体积。

This paper establishes mathematical models of unsteady and Non-Darcy low speed flow through the porous media and the double porous medium, and has obtained their solutions in an infinite reservoir through Laplace transformation, and their long time asymptotic solutions has been worked out, solutions on a bounded reservoir has also obtained through finite integral transformation and Laplace transformation.

从现场上各种水淹的实际资料来看，同一水动力的非均质油层系统中，渗透率相对较高的部分水洗之后，渗透率相对较低部分的油层却可以原封不动。而且，其渗透率可达达西级，含油饱和度可达80％以上。相对流动比(即同一水动力的非均质油层系统中，小层平均渗透率的最大值与其中不流动部分的小层平均渗透率的最大值相比)的比值在各种油层的生产实例中十分相近。一般的分布范围为3—7，常见的为4—6。实验室结果和生产实践基本相同。简单的注水和压裂对这一比值几乎无影响。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。