查询词典 inversion problem

Topics include seismic modeling study of different media, applications of seismic modeling in AVO analysis and medium parameter inversion.

从这些方法的思想和应用效果上可以看出AVO技术的发展现状及其在油气检测中的应用前景。

An improved derivative estimation algorithm with a low-pass filter that can suppress the influence of high-frequency noise is suggested to remove potential drawbacks of the backward difference that was applied in neural network inversion dynamic compensation method, such as large estimation error in the presence of noise and price increase of hardware realization when high estimation accuracy is required.

针对神经网络逆动态补偿策略中基于向后差分的微分估计算法在噪声环境下存在较大的微分估计误差，且提高估计精度会增加硬件成本等缺陷，提出了改进的微分估计算法，并以加速度传感器为例，设计了动态补偿实验装置，给出了基于改进的微分估计算法的动态补偿算法的实现步骤。

However,Bagley and Frantz both reported that inversion was too slow and not very effective.

但是Bagley和Frantz的研究都表明，倒序算子太慢，作用不明显。

Using a method for storing the large-scale sparse matrix with varying band width, Cholesky decomposition, Green function and normalized least square fitting inversion, the paper improved the computing accuracy and efficiency in imaging calculation.

利用有限元方法实现了井间电磁成像，为了求取散射电磁场的积分方程组，运用了处理大型对称变带宽方程组的 Cholesky 分解法，反演时使用了格林函数和最小二乘法，既提高了反演速度又提高了反演质量。

In this paper, basic investigation on BARI from the aspects of numerical simulation, experimental simulation and signal processing has been done by means of combining forward simulation with inversion.

本文从数值模拟、物理模拟和数据处理三个方面采用正演和反演研究相结合的方式对反射声波成像测井技术进行了基础研究。

First, basing on point halving, this thesis proposed a new efficient algorithm of computing kP lQ on an elliptic curve over the finite field with characteristic 2 and analyzed the computational efficiency. When the ratio I/M of inversion to multiplication cost is small, this new algorithm is about 5%～30% faster than the traditional algorithms.

首先，基于半点运算给出一种计算特征为2的有限域上椭圆曲线双标量乘法kP lQ的新算法并分析了效率，当基域上求乘法与求逆的运算时间的比值比较小时，新算法的效率比已有算法提高5％～30％。

The common SVD algorithm was briefly discussed and analyzed on the basis of vector space,and a new iterative scheme was proposed to achieve the nonnegative constraint.Based on this scheme,the SVD inversion algorithm was improved.

摘要介绍了核磁共振T2谱传统奇异值分解反演算法，从向量空间的角度对算法进行了分析，提出了一种新的实现非负约束的迭代方案，并根据这个方案改进了传统的SVD反演算法。

The combined FEM and BEM proposed in this dissertation provides a new approach to an efficient parameter-inversion in hydrogeology.

本文提出的有限单元和边界单元耦合方法为建立有效的水文地质参数反演方法开辟了新的途径。

Bioherm ; seismic reflection structure ; waveform category ; 3-D visualization ; seismic multi-parameter inversion

生物礁；地震反射结构；波形分类；三维可视化；多参数地震反演

But the singularity location inversed by Born approximation inversion is false except the first interface.

本文第二章对Born近似反演算法进行了深入研究和分析，指出了Born近似反演存在的问题。

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。