Nanostructures : theory and modeling Progress in nanoscience is becoming increasingly dependent on simulation and modeling.This isdue to acombination of three factors: the reduced size of nano objects the increasing power of computers and the development of new theoretical methods. This book represents the first attempt to provide the theoretical background needed by physicists engineers and students to simulate nano devices semiconductor quantum dots and molecular devices. It presents in a unified way the theoretical concepts the more recent semi empirical and ab initio methods and their application to experiments. The topics include quantum confinement dielectric and optical properties non radiative processes defects and impurities and quantum transport. This guidebook not only provides newcomers with an accessible overview (requiring only basic knowledge of quantum mechanics and solid state physics) but also provides active researchers with practical simulation tools. TOC:General Basis for Computations and Theoretical Models. Quantum Confined Systems. Dielectric Properties. Quasi Particles and Excitons. Optical Properties and Radiative Processes. Defects and Impurities. Non Radiative and Relaxation Processes. Transport