spontaneous transition
61Nucleosynthesis — Nuclear physics Radioactive decay Nuclear fission Nuclear fusion Classical decays …
62Ising model — The Ising model, named after the physicist Ernst Ising, is a mathematical model in statistical mechanics. It has since been used to model diverse phenomena in which bits of information, interacting in pairs, produce collectiveeffects.Definition… …
63McCumber relation — The McCumber relation (or McCumber theory) refers to the effective cross sections of absorption and emission of light in the physics of solid state lasers [1][2]. Contents 1 Definition 2 Gain …
64international relations — a branch of political science dealing with the relations between nations. [1970 75] * * * Study of the relations of states with each other and with international organizations and certain subnational entities (e.g., bureaucracies and political… …
65population — populational, adj. populationless, adj. /pop yeuh lay sheuhn/, n. 1. the total number of persons inhabiting a country, city, or any district or area. 2. the body of inhabitants of a place: The population of the city opposes the addition of… …
66Beat Generation — The Beat Generation is a term used to describe both a group of American writers who came to prominence in the late 1950s and early 1960s, and the cultural phenomena that they wrote about and inspired (later sometimes called beatniks ): a… …
67Russia — /rush euh/, n. 1. Also called Russian Empire. Russian, Rossiya. a former empire in E Europe and N and W Asia: overthrown by the Russian Revolution 1917. Cap.: St. Petersburg (1703 1917). 2. See Union of Soviet Socialist Republics. 3. See Russian… …
68High-temperature superconductivity — Unsolved problems in physics What causes superconductivity at temperatures above 50 kelvin? High temperature superconductors (abbreviated high Tc or HTS) are materials that have a superconducting transition temperature (Tc) above 30 K… …
69Economy of Russia — Russia is a unique emerging market, in the sense that being the nucleus of a former superpower shows more anomalies. On one hand, its exports are primarily resource based, and on the other, it has a pool of technical talent in aerospace, nuclear… …
70Ferroics — is the generic name given to the study of ferromagnets, ferroelectrics, and ferroelastics. Essentially the basis of this study is to understand the large changes in physical characteristics that occur in a very short temperature range. The… …
