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A cent is a unit of measure for the ratio between two frequencies. An equally tempered semitone (the interval between two adjacent piano keys) spans 100 cents by definition. An octave —two notes that have a frequency ratio of 2:1—spans twelve semitones and therefore 1200 cents.
The Richter scale [1] (/ ˈ r ɪ k t ər /), also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale, [2] is a measure of the strength of earthquakes, developed by Charles Richter in collaboration with Beno Gutenberg, and presented in Richter's landmark 1935 paper, where he called it the "magnitude scale". [3]
EN 1069: Water slides of 2 m height and more. EN 1078: Helmets for pedal cyclists and for users of skateboards and roller skates. EN 1090: Execution of steel structures and aluminium structures (3 parts) EN 1092: Flanges and their joints. Circular flanges for pipes, valves, fittings and accessories, PN designated.
Section 3 of EN 1998-1 gives the rules for the representation of seismic actions and for their combination with other actions. Certain types of structures, dealt with in EN 1998-2 to EN 1998-6, need complementing rules which are given in those Parts. Section 4 of EN 1998-1 contains general design rules relevant specifically to buildings.
European Standards, [1][2] sometimes called Euronorm (abbreviated EN, from the German name Europäische Norm, "European Norm"), [3][4] are technical standards which have been ratified by one of the three European Standards Organizations (ESO): European Committee for Standardization (CEN), European Committee for Electrotechnical Standardization ...
Alpha Centauri (α Centauri, α Cen, or Alpha Cen) is a triple star system in the southern constellation of Centaurus. It consists of three stars: Rigil Kentaurus (α Centauri A), Toliman (α Centauri B), and Proxima Centauri (α Centauri C). [14] Proxima Centauri is the closest star to the Sun at 4.2465 light-years (1.3020 pc).
Eurocodes 1 – 9 are organised thematically, here illustrated downwards from left to right: 1: snow load, 2: concrete bridge, 3: steel bridge, 4: composite, 5: timber house, 6: masonry, 7: sheet pile wall, 8: earthquake and 9: aluminium structure. The Eurocodes are published as a separate European Standards, each having a number of parts.
A census (from Latin censere, 'to assess') is the procedure of systematically acquiring, recording, and calculating population information about the members of a given population, usually displayed in the form of statistics. This term is used mostly in connection with national population and housing censuses; other common censuses include ...