反演问题

This problem has been overcome with an iterative inversion that uses an imaging operator and its adjoint along with a regularization operator.;The imaging operator used in the inversion process is a linear operator relating reflectivities to data.

这个问题已经克服了迭代反演，使用成像算子及其伴随连同正规化运营商。；的影像操作中使用的反演过程是一个线性算子有关的反射率的数据。

It solves the imaging problem in great contrast. In chapter 2, the author deeply studies and analyzes the arithmetic of the method of Born approximation inversion and points out the limitations and disadvantage of the method. The good inverse results can be obtained in little disturbance by Born approximation.

本文提出的反演理论，考虑到散射序列中高阶项对成像结果的影响，在反演时利用逆散射序列中的高阶项以弥补散射场数据的丢失，使得在大扰动量的情况下同样能够实现界面位置和形态的精确成像，解决了大对比度情况下的成像问题。

In this paper,we mainly discuss inverse problems for ellipticpartial differential equations,and parameter inversion and free boundary problemin elliptic equations have been paid much attention to many scientists for a longtime.

我们主要讨论椭圆型偏微分方程中的反问题，而在椭圆型方程的反问题中参数反演及其自由边界问题一直受到人们的关注，本文主要从事这方面研究，全文分为两部分。

Know the error transmiting law clearly, as well as the effect of static migration to inversion result and the MT observation frequency distribution interval reasonability problem.

论文研究了实测资料中的误差对反演解释结果的影响，明确了误差传递规律，以及静态效应对反演解释结果的影响规律，论文探讨了MT观测频率分布间隔的合理性问题。

Next, the author discussed the application problem of the inversion, researched the controllable effects in inversion from different viewpoints.

可信度是反演中无法回避的问题，通常的反演需要做很多的试验才能获得可用的结果。

Sharp boundary inversion is a relatively difficult problem in magnetotelluric and other geophysical inversion, which has been studied by many researchers.

尖锐边界反演是大地电磁及其他地球物理反演中的一个较难解决的问题，目前有不少专家正对这方面进行研究。

Although we can use 2-D forward and inversion to solve problem in work, but the method is not adapted with 3-D geoelectric section.

虽然采用二维反演方法可以解决一些野外实际问题，但与实际三维介质相比其计算精度和整体反演效果仍然不能满足实际的需要。

Genetic algorithm for regularize inversion is designed, which can avoid linearization difficulty in the nonlinear problem and solve the ill-posed problem in magnetotelluric inversion.

设计了基于正则化反演的实数编码混合遗传算法，避免了非线性问题的线性化困难，并较好的解决了大地电磁测深反演的不适定性和非唯一性。

The wavelet marginal analytical modeling wave impedance inversion is pickup characteristic parameters from seis.

基于模型的波阻抗反演虽然克服了厚、薄煤层计算问题，但因难以得到准确的高频部分，很多情况下反演结果的精度和分辨率往往不能满足地质预测的要求。

In this paper, we establish a method to determine the resitivities of the earth and diameter of invaded zone simutaneously,using the deep and shallow apparent resitivitics,and propose a new algorithm. The main advantages of our method is that the selection of the initial value is need not, but in proviously work, it is nescssary and it must close to real values.

成功地解决了由双侧向测井深、浅视电阻率同时反演地层真电阻率和等效侵入带直径问题，建立了可靠的反演算法，此算法的最主要优点在于它不依赖于初值的选取，因而是真正具有工程实用价值的算法。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。