inverse segregation

The non_equilibrium grain_boundary segregation dynamics of phosphorus under isothermal condition, the kinetic equation of segregation processes and desegregation processes ar summarized.

为此介绍了等温保持状态下磷的非平稳晶界偏聚动力学的研究进展 ,建立了非平衡偏聚过程和反偏聚过程动力学方程 ,依此可计算某一温度下任意时刻的晶界偏聚量 ,并求出对应最大偏聚量的临界时间 ,从而可以预报钢的晶界脆性 ,为钢的晶界脆性控制研究提供了依据 。

It divides the nonequilibrium grainboundary segregation into segregation process and desegregation process.

该理论引入了临界时间概念,将等温过程中溶质原子的非平衡晶界偏聚动力学过程分为偏聚过程与反偏聚过程。

Demigration Technolgy Used to Eliminate the Noise in Prestack Data;

反偏移技术对叠前资料的噪声消除

Using geometrical ray theory and a stationary phase method that takes the contribution from the boundary of the domain of integration into account, the author investigates the demigrated wavefield, the weight function, and the optimal demigration aperture in 3 D isochrone stack demigration.

利用几何射线理论和一种考虑了积分域边缘贡献的二维稳相法 ,研究了三维等时线叠加反偏移中的反偏移场、反偏移加权函数及反偏移孔径。

Starting from the formulas in classical F-K migration,we present an F-K demigration theory in constant velocity media and the corresponding implementation steps as well as its applications in inhomogeneous media,by way of mapping wavenumbers into angular frequencies.

从经典的常速度F-K偏移成像理论公式出发,通过由垂直波数到角频率映射的途径首先建立了常速度F-K反偏移的基本理论公式和基本实现算法,然后再将其用于解决非均匀介质中的反偏移问题。