下延

But as the core of the method based on an instabile downward continuation operator,the method is of inefficacy in application.

本文利用徐世浙开发的迭代向下延拓方法代替该算子，使其精度和稳定性都得到很大的提高。

Leaf blade ovate, margin serrate or deeply crenate, base not decurrent to petiole

叶片卵形，边缘有锯齿或具深圆齿，基部不下延至叶柄 55

A container closure formed from a synthetic resin as a single unit has a circular top panel wall and a cylindrical skirt wall extending downwardly from the peripheral edge of the top panel wall.

由合成树脂作为单件形成的容器封盖具有圆形的顶板壁和从此顶板壁的边缘下延的柱形裙壁。

According to the space domain iteration method of the Fredholm integral equation of the first kind, the wave number domain iteration formula is deduced for calculating the wave spectrum of the potential field on a lower horizontal plane.

根据第一类Fredholm积分方程的空间域迭代解法，推导出计算向下延拓水平面上位场波谱的波数域迭代公式。

At the end the test of ground gravity solution from simulated satellite data and down continuation of airborne gravimetry are conducted.

提出并建立了球面小波正则化方法，建立了不适定问题的渐近逼近解，利用这种方法进行了模拟卫星数据反解地面重力位试验以及航空重力测量数据向下延拓试验。

Downward continuation is an important operation in potential field data processing and inversion, but its instability problem influences its application in many processing and inversion techniques.

位场向下延拓是位场数据处理和反演中的重要运算，但是它的不稳定性影响了它在许多处理和反演方法技术中的应用。

This paper focuses on convergence analysis of integral iteration method, and proves that the method is convergent mathematically.

本文着重对积分-迭代法的收敛性进行了分析，从数学角度证明积分-迭代法能够收敛到直接下延法理论解。

This dissertation focuses on the spherical wavelet expansion of the earth gravity field and its application. Based on the concept of the integration approaches and radial basis functions the spherical wavelet is put forward, with that the earth gravity field is described in a new way, and some other researches are conducted, they are: spherical wavelet regularization, multiscale approximation of satellite gravity measurement, down continuation of airborne geavimetry data, the least squares properties of geopotential wavelet approximation, the spherical wavelet solution of two kinds of BVP and spherical selective multiscale reconstruction.

本文围绕地球重力场的球面小波展开及其应用进行研究，在积分逼近与径向基函数概念的基础上引入了球面小波，利用球面小波对重力场展开进行了重新表示，在此基础上进行了球面小波正则化、卫星重力多尺度逼近、航空重力数据向下延拓、重力场球面小波逼近的最小范数性质、两类边值问题的球面小波实用解、球面选择多尺度去噪方法等方面的研究。

Firstly, the principle of the iteration method is presented, the characteristic of the method is analyzed. The downward continuation computation for model and practical data with noise of different variance is performed by means of iteration method.

首先介绍了迭代法的基本原理，分析迭代法的特点；然后利用迭代法对不同噪声水平的模型数据和实测数据进行向下延拓计算，研究噪声对迭代法的计算误差影响。

Gland of calyx rotund or oblong, not decurrent to pedicel

花萼的腺体圆形或长圆形，对花梗不下延 5

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。