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The bel is seldom used, as the decibel was the proposed working unit. [10] The naming and early definition of the decibel is described in the NBS Standard's Yearbook of 1931: [11] Since the earliest days of the telephone, the need for a unit in which to measure the transmission efficiency of telephone facilities has been recognized.
But the definition was soon extended to functions of several variables and to functions of a complex variable. In the second half of the 19th century, the mathematically rigorous definition of a function was introduced, and functions with arbitrary domains and codomains were defined. Functions are now used throughout all areas of mathematics.
A future re-definition of the second would be justified if these idealized conditions can be achieved much easier than with the current definition. The definition of the second should be understood as the definition of the unit of proper time: it applies in a small spatial domain that shares the motion of the caesium atom used to realize the ...
Used electronics which are destined for refurbishment, reuse, resale, salvage recycling through material recovery, or disposal are also considered e-waste. Informal processing of e-waste in developing countries can lead to adverse human health effects and environmental pollution. [2]
Hello, with that spelling, was used in publications in the U.S. as early as the 18 October 1826 edition of the Norwich Courier of Norwich, Connecticut. [1] Another early use was an 1833 American book called The Sketches and Eccentricities of Col. David Crockett, of West Tennessee, [2] which was reprinted that same year in The London Literary Gazette. [3]
The precise definition of the term "child pornography" varies by jurisdictions and there is no consensus in international law regarding the precise meaning of the word. [ 4 ] [ 3 ] In the United States, the U.S. Supreme Court has defined child pornography as material that " visually depicts sexual conduct by children below a specified age". [ 9 ]
The metre (or meter in US spelling; symbol: m) is the base unit of length in the International System of Units (SI). Since 2019, the metre has been defined as the length of the path travelled by light in vacuum during a time interval of 1 / 299 792 458 of a second, where the second is defined by a hyperfine transition frequency of caesium.
The definition of refurbished goods can not include goods that have not been refurbished, such as returned unwanted goods, often still in sealed packaging. They may be sold by the same outlets as the almost new items, but it doesnt make them refurbed.