-
1 вычислять по формуле
Вычислять по формулеValues for pipe body yield strength were calculated by means of Formula ....Internal yield pressure for pipe is calculated from Formula ....Русско-английский научно-технический словарь переводчика > вычислять по формуле
-
2 Napier (Neper), John
SUBJECT AREA: Electronics and information technology[br]b. 1550 Merchiston Castle, Edinburgh, Scotlandd. 4 April 1617 Merchiston Castle, Edinburgh, Scotland[br]Scottish mathematician and theological writer noted for his discovery of logarithms, a powerful aid to mathematical calculations.[br]Born into a family of Scottish landowners, at the early age of 13 years Napier went to the University of St Andrews in Fife, but he apparently left before taking his degree. An extreme Protestant, he was active in the struggles with the Roman Catholic Church and in 1594 he dedicated to James VI of Scotland his Plaine Discovery of the Whole Revelation of St John, an attempt to promote the Protestant case in the guise of a learned study. About this time, as well as being involved in the development of military equipment, he devoted much of his time to finding methods of simplifying the tedious calculations involved in astronomy. Eventually he realized that by representing numbers in terms of the power to which a "base" number needed to be raised to produce them, it was possible to perform multiplication and division and to find roots, by the simpler processes of addition, substraction and integer division, respectively.A description of the principle of his "logarithms" (from the Gk. logos, reckoning, and arithmos, number), how he arrived at the idea and how they could be used was published in 1614 under the title Mirifici Logarithmorum Canonis Descriptio. Two years after his death his Mirifici Logarithmorum Canonis Constructio appeared, in which he explained how to calculate the logarithms of numbers and gave tables of them to eight significant figures, a novel feature being the use of the decimal point to distinguish the integral and fractional parts of the logarithm. As originally conceived, Napier's tables of logarithms were calculated using the natural number e(=2.71828…) as the base, not directly, but in effect according to the formula: Naperian logx= 107(log e 107-log e x) so that the original Naperian logarithm of a number decreased as the number increased. However, prior to his death he had readily acceded to a suggestion by Henry Briggs that it would greatly facilitate their use if logarithms were simply defined as the value to which the decimal base 10 needed to be raised to realize the number in question. He was almost certainly also aware of the work of Joost Burgi.No doubt as an extension of his ideas of logarithms, Napier also devised a means of manually performing multiplication and division by means of a system of rods known as Napier's Bones, a forerunner of the modern slide-rule, which evolved as a result of successive developments by Edmund Gunther, William Oughtred and others. Other contributions to mathematics by Napier include important simplifying discoveries in spherical trigonometry. However, his discovery of logarithms was undoubtedly his greatest achievement.[br]BibliographyNapier's "Descriptio" and his "Constructio" were published in English translation as Description of the Marvelous Canon of Logarithms (1857) and W.R.MacDonald's Construction of the Marvelous Canon of Logarithms (1889), which also catalogues all his works. His Rabdologiae, seu Numerationis per Virgulas Libri Duo (1617) was published in English as Divining Rods, or Two Books of Numbering by Means of Rods (1667).Further ReadingD.Stewart and W.Minto, 1787, An Account of the Life Writings and Inventions of John Napier of Merchiston (an early account of Napier's work).C.G.Knott (ed.), 1915, Napier Tercentenary Memorial Volume (the fullest account of Napier's work).KF -
3 elasticity
Finthe measure of the sensitivity of one variable to another.EXAMPLEIn practical terms, elasticity indicates the degree to which consumers respond to changes in price. It is obviously important for companies to consider such relationships when contemplating changes in price, demand, and supply.Demand elasticity measures how much the quantity demanded by a customer changes when the price of a product or service is increased or lowered. This measurement helps companies to find out whether demand will remain constant despite price changes. Supply elasticity measure the impact on supply when a price is changed.The general formula for elasticity is:Elasticity = % change in x/% change in yIn theory, x and y can be any variable. However, the most common application measures price and demand. If the price of a product is increased from $20 to $25, or 25%, and demand in turn falls from 6,000 to 3,000, elasticity would be calculated as:−50%/25% = – 2A value greater than 1 means that demand is strongly sensitive to price, while a value of less than 1 means that demand is not pricesensitive.
См. также в других словарях:
Formula calculator — A formula calculator is a software calculator that can perform a calculation in two steps:1. Type in a formula from the keyboard. 2. Press a single button or key to see the formula’s value. [Formula Calculators Pty Ltd [home page on the Internet] … Wikipedia
Means test — A means test is a determination of whether an individual or family is eligible for help from the government. Contents 1 Canada 2 United Kingdom 3 United States 4 Other international examples … Wikipedia
Formula One — F1 redirects here. For other uses, see F1 (disambiguation). For other uses, see Formula One (disambiguation). Formula One Category Single seater Country or region Worldwide … Wikipedia
formula — 1. A recipe or prescription containing directions for the compounding of a medicinal preparation. 2. In chemistry, a symbol or collection of symbols expressing the number of atoms of the element or elements forming one molecule of a substance,… … Medical dictionary
Selberg trace formula — In mathematics, the Selberg trace formula is a central result, or area of research, in non commutative harmonic analysis. It provides an expression for the trace, in a sense suitably generalising that of the trace of a matrix, for suitable… … Wikipedia
Federal Bridge Gross Weight Formula — [ wheelbase trucks. The shorter truck is damaging the bridge because all of its weight is concentrated in a smaller area.] The Federal Bridge Gross Weight Formula is a mathematical formula used by truck drivers and United States Department of… … Wikipedia
Semi-empirical mass formula — In nuclear physics, the semi empirical mass formula (SEMF), sometimes also called Weizsäcker s formula, is a formula used to approximate the mass and various other properties of an atomic nucleus. As the name suggests, it is partially based on… … Wikipedia
Barnett formula — The Barnett formula is a mechanism used by Her Majesty s Treasury in the United Kingdom to adjust automatically some elements of public expenditure in Northern Ireland, Scotland and Wales to reflect decisions affecting other parts of the country … Wikipedia
Elo rating system — Chess Go The Elo rating system is a method for calculating the … Wikipedia
Nuclear binding energy — is the energy required to split a nucleus of an atom into its component parts. The component parts are neutrons and protons, which are collectively called nucleons. If the binding energy for the products is higher when light nuclei fuse, or when… … Wikipedia
Cluster analysis — The result of a cluster analysis shown as the coloring of the squares into three clusters. Cluster analysis or clustering is the task of assigning a set of objects into groups (called clusters) so that the objects in the same cluster are more… … Wikipedia
