Linear image processing of pulse GMAW droplet photos based on frequency domain calculation;

Oscillation mechanism of potential field downward continuation in frequency domain and its elimination;

As in other electromagnetic sounding methods,static offset and correction also arise in frequency-domain electromagnetic sounding.

In this paper,the authors study the mathematical model for seismic wave propagation in complex underground medium,discuss the boundary element method for solving seismic wave equations in frequency-domain,and investigate the computational formation of separation of wave equations in frequency-domain.

A new method for improving signal/noise ratio and resolution by dual direction prediction in frequency-space domain;

Combined boundary conditions of quasi-P wave within frequency-space domain in VTI media.;

Numerical simulation in the frequency-space domain has inherent advantages,such as:it is possible to simulate wave propagation from multiple sources simultaneously;there are no cumulative errors;only the interesting frequencies can be selected;and it is more suitable for wave propagation in viscoelastic media.