查询词典 computations

In this paper algorithms based on wavelet packets for multiresolution data fusion are proposed, which are efficient and highly parallelizable. So it avoids big matrix computations, and also has effective performances without assuming wavelet coefficients to be white noises.

本文研究了小波变换的特性，提出基于小波包变换的多分辨率多传感器数据融合算法，算法不需要把小波系数当成白噪声处理，并且能够有效地降低向量和矩阵维数，减少运算，有较好的滤波性能。

The results of computations show that the structure of unsteady flow is complex during both the acceleration phase and the constant velocity phase.

计算结果表明启动过程绕大攻角翼型的加速流动结构复杂，该瞬态过程的流动分离现象也明显区别于稳态过程自生和自维持的分离流动，并且启动加速度大小对流动的分离、漩涡结构和强度等都有直接影响。

The solver is used to investigate laminar and turbulent separated flows around a 6:1 prolate spheroid at high incidence angles and their effects on hydrodynamic forces. The second separation flows are successfully identified in both laminar and turbulent flow simulations. The computations are shown to agree well with available experimental and numerical data and the physics of 3D large-scale flow separations and vortex shedding are confirmed.

应用所开发的求解器，以6：1长椭球体为算例计算了回转体在大攻角下定常斜航运动时的三维粘性流场及水动力，对层流流动和湍流流动分别进行了计算，分析了层流与湍流分离流动和涡旋产生的特点及其对水动力的影响；计算结果与他人的试验和计算数据比较，吻合程度良好，表明应用本求解器能够正确模拟这种以层流/湍流分离流为主的复杂粘性流动，得到相当精确的水动力，检验和验证了该求解器精确模拟回转体在大攻角下的粘性分离流动和计算水动力的能力。

Therefore, it is always reasonable that the numerical rank be regarded as the rank of a matrix in the process of numerical computations.

从而在数值计算过程中，认为矩阵的秩就是其数值秩总是合理的。

In chapter 5, we investigate the iterative methods for solving the linear systems by the homotopy perturbation technique, and the numerical rank of a matrix in the matrix computations are considered, especially the ill-conditioned matrices.

本文第五章中我们首先利用同伦摄动技巧考察了线性方程组的迭代解法。其次，从数值计算的角度考察了矩阵的数值秩问题，尤其是病态矩阵。

The computations produced the profile of mean velocity and flow reattachment point, which are compared with experimental results.

计算获得了方柱下游回流区长度和速度场，并将它们与实验结果进行了比较。

Complexities analysis shows that the new algorithm needs only half the amount of computations needed by the algorithms based on the Levinson recursive relation.

计算复杂性分析表明，新算法的计算量只是基于传统的Levinson递推关系的算法的一半。

The free-surface boundary conditions are satisfied on the free-moving surface exactly without any approximation or linearization. The governing equations and the boundary conditions on the time-dependent, physical domain are transformed onto a regular domain for numerical computations.

为於未知的自由液面边界上满足非线性边界条件，本模式利用座标转换，将非稳态且不规则物理区间的流场控制方程式与边界条件，映射至规则的计算区间，以进行数值解析。

The appropriate assembly temperature is related to mechanics properties of material and operating temperature, so reiterative computations are necessary to find an appropriate assembly temperature by the method that makes the maximal tensile stress smallest under conditions that the maximal compressive stress is less than the compressive yield point of material.

安装温度的选择与材料的力学性能及零件的工作温度紧密相关，因此选择合适的安装温度需要反复计算，其方法是在保证循环中的最大压缩应力小于材料压缩屈服点的条件下，使最大拉应力最小。

When a shortest path between nodes is searched with this algorithm,a lot of repetitional computations are involved,so that the efficiency is low.

借助于矩阵算法来求最短路问题比较有效[1]，但当节点比较多时，计算的矩阵多，重复计算量大，降低了计算效率[2，3]。

For the head-teacher of the class said that I had seriously broken the school rules,which led me to a three-day suspend class.

为什么呢？因为我的班主任说我严重的违反了校规，于是让我停课三天。

Many of them believe that the conversion of thousands of working-class folk in England spared that nation from the mass carnage and the tyranny that came with the revolution in France.

他们之中有许多人相信，在英国数以千计的劳工阶级之悔改信主使英国免於遭受如法国大革命所造成的大屠杀和专制暴政。