-
1 обычно
••Liquid diffraction patterns characteristically show one or two maxima that correspond to...
•The great majority of routinely detected events can be classified as earthquakes.
•The receptacle is conventionally 2-wire, 120-volt, 15-ampere.
•That is how the logarithms are conventionally tabulated.
•This inert phase is normally a gel structure.
•Engineering practice is to express quantities in lb/h.
•Group I members tend to have relatively few nucleosides of this sort.
•Such lasers typically generate pulses of 5—10 ns duration.
•Traditionally, the residual bottoms have been blended with lighter stocks.
•It is usual to check the... level whenever there is any doubt.
•In this application it is common (or usual) to employ...
•It is common for metabolic pathways to exhibit some form of cyclic pattern.
•The atomic weight is commonly called the mass number.
•The head gain is customarily measured in inches of water.
•It is customary to install a pump having two or three stages.
•The factor is generally taken to be equal to unity.
•A field lens is generally placed behind the reticle.
•Floating roof tanks are normally employed for prevention of loss through evaporation.
•The temperature at this point is ordinarily the same as that of the forward cylinder section.
•Where it is suspected that... it is the practice (or custom) to steam out the coils.
•In large marine installations it is standard (or usual) practice to use...
•The sensitivity for detection is typically (or usually, or generally, or commonly, or as a rule) five times as great as...
•In designing such packed columns, it is common (or general) practice to assume "piston", or "plug" flow.
•The regions of strongest divergence tend to be found over the subtropical regions.
•Many plant breeders make a practice of having different batches of seed treated with gamma rays, neutrons and one chemical mutagen.
•The usual way to stop the intrusion has been to drill... (геол.).
II•In this way dye molecules can enter more freely otherwise inaccessible dye-sites.
Русско-английский научно-технический словарь переводчика > обычно
-
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
См. также в других словарях:
The Library of Babel — Infobox short story | name = The Library of Babel title orig = La biblioteca de Babel translator = James E. Irby Anthony Kerrigan author = Jorge Luis Borges country = Argentina flagicon|Argentina language = Spanish series = genre = Fantasy, short … Wikipedia
Generalizations of the derivative — The derivative is a fundamental construction of differential calculus and admits many possible generalizations within the fields of mathematical analysis, combinatorics, algebra, and geometry. Contents 1 Derivatives in analysis 1.1 Multivariable… … Wikipedia
Wikipedia:Reference desk/Mathematics — The Wikipedia Reference Desk covering the topic of mathematics. Mathematics #eee #f5f5f5 #eee #aaa #aaa #aaa #00f #36b #000 #00f mathematics Wikipedia:Refere … Wikipedia
numerical analysis — the branch of mathematics dealing with methods for obtaining approximate numerical solutions of mathematical problems. [1925 30] * * * Branch of applied mathematics that studies methods for solving complicated equations using arithmetic… … Universalium
Comparison of C Sharp and Java — The correct title of this article is Comparison of C# and Java. The substitution or omission of the # sign is because of technical restrictions. Programming language comparisons General comparison Basic syntax Basic instructions … Wikipedia
Temperament Ordinaire — The phrase temperament ordinaire , (French tempérament ordinaire , meaning literally: ordinary temperament or usual temperament ), relates to musical intonation, and especially to the tempered tuning of keyboard instruments. At least in its later … Wikipedia
Odds ratio — The odds ratio [1][2][3] is a measure of effect size, describing the strength of association or non independence between two binary data values. It is used as a descriptive statistic, and plays an important role in logistic regression. Unlike… … 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
United States Numbered Highways — The system of United States Numbered Highways (often called U.S. Routes or U.S. Highways) is an integrated system of roads and highways in the United States numbered within a nationwide grid. As these highways were coordinated among the states,… … Wikipedia
History of computer science — The history of computer science began long before the modern discipline of computer science that emerged in the twentieth century. The progression, from mechanical inventions and mathematical theories towards the modern concepts and machines,… … Wikipedia
Gravity model of trade — The gravity model of trade in international economics, similar to other gravity models in social science, predicts bilateral trade flows based on the economic sizes of (often using GDP measurements) and distance between two units. The model was… … Wikipedia
