linear wave interaction
121Type II supernova — The expanding remnant of SN 1987A, a Type II P supernova in the Large Magellanic Cloud. NASA image. A Type II supernova (plural: supernovae) results from the rapid collapse and violent explosion of a massive star. A star must have at least 9… …
122Nonlinear photonic crystal — Nonlinear photonic crystals are usually used as quasi phase matching materials. They can be either one dimensional[1] or two dimensional.[2] Nonlinear Photonic Crystals Broadly speaking, nonlinear photonic crystals (PC) are periodic structures… …
123Perturbation theory (quantum mechanics) — In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a …
124Slater determinant — In quantum mechanics, a Slater determinant is an expression that describes the wavefunction of a multi fermionic system that satisfies anti symmetry requirements and consequently the Pauli exclusion principle by changing sign upon exchange of… …
125Large igneous province — Only a few of the largest Large Igneous Provinces are indicated (by the dark purple areas) on this geological map, which depicts crustal geologic provinces as seen in seismic refraction data. A Large Igneous Province (LIP) is an extremely large… …
126Computational electromagnetics — Computational electromagnetics, computational electrodynamics or electromagnetic modeling is the process of modeling the interaction of electromagnetic fields with physical objects and the environment. It typically involves using computationally… …
127Surface phonon — Phonons are collective lattice vibration modes, and surface phonons are those particular modes associated with surfaces; they are an artifact of periodicity, symmetry, and the termination of bulk crystal structure associated with the surface… …
128Spin (physics) — This article is about spin in quantum mechanics. For rotation in classical mechanics, see angular momentum. In quantum mechanics and particle physics, spin is a fundamental characteristic property of elementary particles, composite particles… …
