1. Wave Front Propagation for KPP-Type Equations. - 1. 1. Introduction. - 1. 2. Wave Fronts in a Flow with Nontrivial Velocity Profile. - 1. 3. Generalizations and Remarks. - 1. 4. Wave Front Propagation in Anisotropic Media. - 1. 5. Wave Front Propagation in a Tube with Absorbing Walls. - 1. 6. Wave Front Propagation in Slowly Nonhomogeneous Media. - 1. 7. RDE Systems of KPP Type. - 1. 8. RDEs in Narrow Branching Channels. - References. - 2. Particle and Wave Transmission in One-Dimensional Disordered Systems. - 2. 1. Introduction. - 2. 2. Localization. - 2. 3. Transmission Coefficient. - 2. 4. Reflection and Resonances. - 2. 5. Probability Distributions of Transmittivity Decrements for High Energies. - 2. 6. Observable Transparency. - 2. 7. Waves in the Randomly Stratified Medium. - 2. 8. Disorder and Nonlinearity. - References. - 3. Asymptotic Equations for Nonlinear Hyperbolic Waves. - 3. 1. Introduction. - 3. 2. Hyperbolic Waves. - 3. 3. Dissipation and Dispersion. - 3. 4. Miscellaneous Applications. - 3. 5. Diffraction. - 3. 6. Other Topics. - References. Language: English