Contents: The Spectrum of Quasiregular Heterostructures; Tailoring Empirical Tight-Binding Models for Semiconductor Heterostructures Calculations; Vortex Avalanches in Type II Superconductors; The Sandpile Perspective; Study of Many Interfaces and Inhomogeneous Systems; Quantum Heisenberg Ferrimagnetic Chains; Finite-Photon Systems in Semiconducting Heterostructures; The Boltzman-Loschmidt Controversy; Exchange Energy of a Hole Gas and the Thomas-Fermi-Dirac Approximation.