drive-in diffusion cycle
41Mechanical ventilation — In architecture and climate control, mechanical or forced ventilation is the use of powered equipment, e.g. fans and blowers, to move air  see ventilation (architecture). Mechanical ventilation Intervention …
42P-type ATPase — Calcium ATPase, E2 Pi state Identifiers Symbol E1 E2 ATPase Pfam …
43Beetle — Beetles redirects here. For the band, see The Beatles. For the car, see Volkswagen Beetle. This article is about the insect. For other uses, see Beetle (disambiguation). Beetle Temporal range: 318–0 Ma …
44100,000-year problem — The 100,000 year problem is a discrepancy between past temperatures and the amount of incoming solar radiation, or insolation, which grows and shrinks periodically on a 100,000 year (100 ka) timescale.Due to variations in the Earth s orbit, the… …
45metabolism — /meuh tab euh liz euhm/, n. 1. Biol., Physiol. the sum of the physical and chemical processes in an organism by which its material substance is produced, maintained, and destroyed, and by which energy is made available. Cf. anabolism, catabolism …
46social science — social scientist. 1. the study of society and social behavior. 2. a science or field of study, as history, economics, etc., dealing with an aspect of society or forms of social activity. [1775 85] * * * Any discipline or branch of science that… …
47human cardiovascular system — ▪ anatomy Introduction organ system that conveys blood through vessels to and from all parts of the body, carrying nutrients and oxygen to tissues and removing carbon dioxide and other wastes. It is a closed tubular system in which the… …
48Pebble bed reactor — Sketch of a pebble bed reactor in Italian …
49Four-phase logic — is a type of, and design methodology for, dynamic logic; it enabled non specialist engineers to design quite complex ICs, using either PMOS or NMOS processes.HistoryIn 1968 Lee Boysel [http://en.wikipedia.org/wiki/Four Phase Systems AL1] ,… …
50Beijing 2008 Olympic Games: Mount Olympus Meets the Middle Kingdom — Introduction officially Games of the XXIX Olympiad The Games of the XXIX Olympiad, involving some 200 Olympic committees and as many as 13,000 accredited athletes competing in 28 different sports, were auspiciously scheduled to begin at 8 …
