Derived No-Effect Level
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Derived no-effect level — The derived no effect level (DNEL) is the level of exposure to a substance above which humans should not be exposed. According to REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) legislation, i.e. REGULATION (EC) No… … Wikipedia
Level — or levels may refer to: Contents 1 Places 2 Engineering related 3 Science and mathematics … Wikipedia
Level of measurement — The levels of measurement , or scales of measure are expressions that typically refer to the theory of scale types developed by the psychologist Stanley Smith Stevens. Stevens proposed his theory in a 1946 Science article titled On the theory of… … Wikipedia
Ground effect vehicle — A ground effect vehicle, wing in ground effect vehicle (WIG), flarecraft, sea skimmer, ekranoplan, or wing in surface effect ship (WISE) is a vehicle that attains level flight near the surface of the Earth, made possible by a cushion of high… … Wikipedia
Balassa-Samuelson effect — The Balassa Samuelson effect (also known as Harrod Balassa Samuelson effect (Kravis and Lipsey 1983), the Ricardo Viner Harrod Balassa Samuelson Penn Bhagwati effect (Samuelson 1994, p. 201), productivity biased purchasing power parity (PPP)… … Wikipedia
Doppler effect — Change of wavelength caused by motion of the source. An animation illustrating how the Doppler effect causes a car engine or siren to soun … Wikipedia
Levels-of-processing effect — The levels of processing effect, identified by Fergus I. M. Craik and Robert S. Lockhart in 1972, describes memory recall of stimuli as a function of the depth of mental processing. A stimulus’s mental processing depth is determined by… … Wikipedia
Accelerator effect — The accelerator effect in economics refers to a positive effect on private fixed investment of the growth of the market economy (measured e.g. by Gross Domestic Product). Rising GDP (an economic boom or prosperity) implies that businesses in… … Wikipedia
Butterfly effect — For other uses, see Butterfly effect (disambiguation). Point attractors in 2D phase space. In chaos theory, the butterfly effect is the sensitive dependence on initial conditions; where a small change at one place in a nonlinear system can result … Wikipedia
photoelectric effect — Physics. the phenomenon in which the absorption of electromagnetic radiation, as light, of sufficiently high frequency by a surface, usually metallic, induces the emission of electrons from the surface. Also called photoemission. [1890 95] * * *… … Universalium
Kondo effect — According to the Kondo effect, the electrical resistance will diverge as the temperature approaches 0 K. The temperature dependence of the resistance including the Kondo effect is written as: ho(T) = ho 0 + aT^2 + c m lnfrac{mu}{T} + bT^5,where… … Wikipedia
