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U |
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Utilitarian
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ultraviolet ,
.Ultraviolet (UV) light is electromagnetic radiation
with a wavelength shorter than that of visible light, but
longer than soft X-rays. It is so named because the
spectrum consists of electromagnetic waves with
frequencies higher than those that humans identify as the
color violet (purple).
UV light is typically found as part of the radiation
received by the Earth from the Sun. Most humans are aware
of the effects of UV through the painful condition of
sunburn. The UV spectrum has many other effects, including
both beneficial and damaging changes to human health.
unidirectional slabs (F dalles unidirectionnelles, R placi armate pe o directie)... USACE US Army Corps of Engineers Upstand Portion of roof covering turned up against a vertical surface, yet not necessarily tucked into a groove (BS 2717) V Void (in the context of cellular materials, such as concrete) cavity formed either intentionally or unintentionally (ISO 1382)
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Utility Utility is applied by economists in
such constructs as the indifference curve, which plots the
combination of commodities that an individual or a society
requires to maintain a given level of satisfaction.
Individual utility and social utility can be construed as
the dependent variable of a utility function (such as an
indifference curve map) and a social welfare function
respectively. When coupled with production or commodity
constraints, these functions can represent Pareto
efficiency, such as illustrated by Edgeworth boxes and
contract curves. Such efficiency is a central concept of
welfare economics. |
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back to
catalog |
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back to index |
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© 2006 . EDDY LEE
send email |
