We can use the methods of polynomial(Taylor and Legendre),spherical cap harmonic analysis,rectangular harmonic analysis and surface spline to derive the seismo geomagnetic background field and extract the geomagnetic anomaly variation associated with earthquake.

Also, it sets up the model of measuring interface effectiveness by using harmony analysis matrix and harmony theory.

Based on the harmony theory,using the disharmony analysis matrix,it analyzes the present situation of strategic alliance,it can realize the ideal harmony situation through the system evolution optimization model,then it can guide the strategic alliance units to take the corresponding strategic measures.

Development of harmonics analysis function automatic test system for omnipotent circuit breaker;

FFT harmonics analysis based on fourth order Newton interpolation synchronization;

The Study of Harmonics Analysis in the Electric Power System based on TMS320LF2407;

Study of harmonic analysis and simulation of offshore platform power system;

Inter-harmonic analysis approach in power system using neural network algorithm with Fourier basis functions;

Application of EDSA software on the power system harmonic analysis;

The spherical harmonic analysis in geomagnetism and gravitation;

The purpose of the paper is to present spherical harmonic analysis for determining the Earths gravity field model from satellite gravity gradiometry data.