region of convergence

However, the traditional trust region subproblem may meet difficulty. The Hessian matrix of the trust region subproblem may not be positive definite. In this case, the convergence rate of some trust region methods is only linear.

但传统的信赖域算法存在如下弱点：当信赖域子问题的海森矩阵不正定时，数值计算上存在一定困难，此时有些算法只具有线性收敛速度。

This paper presents an analysis of the twisting process of the two-strand yarn spining, which results in the fOrmulae to calculate the strand twist in the convergence region and the convergence an-gle.

本文对双纱纺的成纱机理进行了理论分析，并获得了交汇区中的单纱捻度和交汇角的理论计算公式。

A Simple Method of Enlarging the Convergence Region of Newtonian Binomial Expression ( 1+ t)￣α to Infinity

牛顿二项式（1十t）~α收敛区域扩大到无穷的一种简单方法

From industrial structure and internal constraints of Beijing-Tianjin-Hebei region, we can see the region is lack of cooperation in industrial development plan, the industrial structure convergence restricts the smooth transfer of industrial gradient.

从京津冀产业结构趋同和内部制约可以看出，京津冀地区缺乏行之有效的产业合作发展规划，产业结构趋同性制约着产业梯度的顺利转移。

To seek a quick and accurate color Doppler method estimating the mitral regurgitant grade, a comparative study of flow convergence region and jet sizes on evaluation of mitral regurgitation was performed in 30 patients with mitral insufficiency.

为了探讨彩色多普勒对二尖瓣返流程度更为准确、快捷的评估方法，我们对30例二尖瓣关闭不全患者进行了血流会聚区大小及返流束大小判断二尖瓣返流的对比研究。

Based on the theory of convergence, to decrease the disparities there must be a premise that the conditions of western regions which determine convergence must be the same as, or similar to those of eastern region.

通过对趋同理论的分析，缩小地区差距必须以西部地区具备与东部地区相同或者相似的趋同条件为前提。