trapping layer
121South Africa — Republic of, a country in S Africa; member of the Commonwealth of Nations until 1961. 42,327,458; 472,000 sq. mi. (1,222,480 sq. km). Capitals: Pretoria and Cape Town. Formerly, Union of South Africa. * * * South Africa Introduction South Africa… …
122Physical Sciences — ▪ 2009 Introduction Scientists discovered a new family of superconducting materials and obtained unique images of individual hydrogen atoms and of a multiple exoplanet system. Europe completed the Large Hadron Collider, and China and India took… …
123atmosphere, evolution of — Introduction the development of Earth s (Earth) atmosphere across geologic time. The process by which the current atmosphere arose from earlier conditions is complex; however, evidence related to the evolution of Earth s atmosphere, though… …
124Negative bias temperature instability — (NBTI) is a key reliability issue in MOSFETs. It is of immediate concern in p channel MOS devices, since they almost always operate with negative gate to source voltage; however, the very same mechanism affects also nMOS transistors when biased… …
125Bongo (antelope) — The Bongo redirects here. For other uses, see Bongo (disambiguation). Western/Lowland Bongo Conservation status …
126Missouri River — Coordinates: 38°48′49″N 90°07′11″W / 38.81361°N 90.11972°W / 38.81361; 90.11972 …
127Island Fox — Taxobox name = Island FoxMSW3 Wozencraft | pages = | id = 14000858] status = CR trend = down status system = iucn2.3 status ref = IUCN2006|assessors=Roemer et al |year=2004|id=22781|title=Urocyon littoralis|downloaded=11 May 2006 Database entry… …
128Electron mobility — This article is about the mobility for electrons and holes in metals and semiconductors. For the general concept, see Electrical mobility. In solid state physics, the electron mobility characterizes how quickly an electron can move through a… …
