M. , 2008. The manual focuses on physical models in which nonlinear wave equations arise - mainly in nonlinear acoustics and optics. Here, emphasis is placed on the importance of the role of variance ratios in the study of various physical problems. Sections 2 to 9 of the ten benefit sections. are given Summary:Dispersion equation. Conclusion of dispersion equation and symmetry properties of its solutions. Properties of the symmetry of the dispersion equation solutions. Dispersion equation for electromagnetic waves in LC lines. Dispersion equation for directed waves. Reduction of space. charge in beams of limited cross-section. Absolute and convective disorder. Amplification and non-transmission.. The integration of quasi-harmonic waves in weakly dissipative media. Wave energy in a dispersing medium. Resonance interaction in conservative environments . Four-wave interactions and self-exposure of waves in a quadratic medium. Wave competition in an active environment . The Ginzburg-Landau equation . Text of the manual on 89 pages . with illustrations. Format - PDF.