air discharge line
81photography, technology of — Introduction equipment, techniques, and processes used in the production of photographs. The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …
82Lightning — This article is about the atmospheric electrical phenomenon. For other uses, see Lightning (disambiguation). See also: Lightning strike Lightning striking Atlanta, United States Lightning is an atmospheric electrostatic discharge (spar …
83luminescence — luminescent, adj. /looh meuh nes euhns/, n. 1. the emission of light not caused by incandescence and occurring at a temperature below that of incandescent bodies. 2. the light produced by such an emission. [1885 90; < L lumin (see LUMEN) +… …
84President of the United States — POTUS redirects here. For political talk radio, see P.O.T.U.S. (Sirius XM). For other uses, see President of the United States (disambiguation). For a list, see List of Presidents of the United States. President of the United States of America …
85Uninterruptible power supply — A small free standing UPS …
86High-voltage direct current — HVDC or high voltage, direct current electric power transmission systems contrast with the more common alternating current systems as a means for the bulk transmission of electrical power. The modern form of HVDC transmission uses technology… …
87List of Cold War pilot defections — During the Cold War, a number of pilots from various nations (Eastern Bloc, Western Bloc, and non aligned) defected with their aircraft to other countries. Contents 1 Afghanistan 2 Algeria 3 China …
88Oath of Allegiance (United Kingdom) — King John signing the Magna Carta at Runnymede …
89nervous system, human — ▪ anatomy Introduction system that conducts stimuli from sensory receptors to the brain and spinal cord and that conducts impulses back to other parts of the body. As with other higher vertebrates, the human nervous system has two main… …
90Mercury regulation in the United States — is a set of laws and regulations limiting the maximum concentrations of mercury (Hg) that is permitted in air, water, soil, food and drugs. These laws and regulations are promulgated by U.S. Federal Agencies such as the Environmental Protection… …
