-
1 Reed Counting Systems
Reeds are counted in two systems: (1) Those in which the count or sett is expressed by the number of dents or splits contained in a given space, and include the Radcliffe, Huddersfield, Stockport, Scottish and Macclesfield systems; (2) those in which the count or sett indicates the number of groups of dents contained in a given space. These groups are variously termed beers, porties, or porters, and include the Bolton, Bradford, Dewsbury, Leeds, and Dundee systems. For details see under each system given. REED, ERDMANN - A patented reed used to weave ondule or waved patterns. The wires are specially shaped, and the reeds are raised and lowered in the loom while weaving. REED, FLEXIBLE - Specially constructed reeds used for leno weaving where the douping threads are very thick. They are made by wrapping only one baulk with pitched cord and the other with unpitched cord. REED MARKS - Marks or streaks running the warp way of the cloth. Marks uniformly across the cloth are usually due to insufficient warp threads per inch. Isolated marks may be due to a defective reed. Reed marks may also be caused by incorrect setting of the warp rollers, incorrect timing of shedding and picking, and also by wrong weighting of the warp. REED, OMBRE - A mill term in the U.S.A. for reed marks in cloth showing in the form of streaks running warp way and caused by irregular spacing of the warp threads. REEDS, ONDULE, FAN, or PAQUET - Specially constructed reeds used for weaving wave effects down the cloth. They are of many forms, and when weaving are raised and lowered as required for pattern (see Ondule)Dictionary of the English textile terms > Reed Counting Systems
-
2 неправильная установка распределения
Automobile industry: incorrect timingУниверсальный русско-английский словарь > неправильная установка распределения
-
3 неправильная синхронизация двигателя
Engineering: incorrect engine timingУниверсальный русско-английский словарь > неправильная синхронизация двигателя
-
4 расчётный
Расчётный - design (проектный); predicted (полученный по формуле и сравниваемый обычно с экспериментальным значением); rated (номинальный); predictive (используемый для расчёта); computed, reference (исходный, взятый за основу в последующих расчётах)Under these circumstances, we may consider raising the design heat flux substantially.Observed and predicted flowrates are presented in Figs.... and...An incorrect estimate of the pressure wave speed may be cause of the small shift in the timing between the measured and computed pressures at the downstream end.If the film temperature is used as the reference temperature, the function f is given by...Русско-английский научно-технический словарь переводчика > расчётный
-
5 сдвиг по времени
Сдвиг по времени-- An incorrect estimate of the pressure wave speed may be the cause of the small shift in the timing between the measured and computed pressures at the down-stream end.Русско-английский научно-технический словарь переводчика > сдвиг по времени
-
6 Huygens, Christiaan
SUBJECT AREA: Horology[br]b. 14 April 1629 The Hague, the Netherlandsd. 8 June 1695 The Hague, the Netherlands[br]Dutch scientist who was responsible for two of the greatest advances in horology: the successful application of both the pendulum to the clock and the balance spring to the watch.[br]Huygens was born into a cultured and privileged class. His father, Constantijn, was a poet and statesman who had wide interests. Constantijn exerted a strong influence on his son, who was educated at home until he reached the age of 16. Christiaan studied law and mathematics at Ley den University from 1645 to 1647, and continued his studies at the Collegium Arausiacum in Breda until 1649. He then lived at The Hague, where he had the means to devote his time entirely to study. In 1666 he became a Member of the Académie des Sciences in Paris and settled there until his return to The Hague in 1681. He also had a close relationship with the Royal Society and visited London on three occasions, meeting Newton on his last visit in 1689. Huygens had a wide range of interests and made significant contributions in mathematics, astronomy, optics and mechanics. He also made technical advances in optical instruments and horology.Despite the efforts of Burgi there had been no significant improvement in the performance of ordinary clocks and watches from their inception to Huygens's time, as they were controlled by foliots or balances which had no natural period of oscillation. The pendulum appeared to offer a means of improvement as it had a natural period of oscillation that was almost independent of amplitude. Galileo Galilei had already pioneered the use of a freely suspended pendulum for timing events, but it was by no means obvious how it could be kept swinging and used to control a clock. Towards the end of his life Galileo described such a. mechanism to his son Vincenzio, who constructed a model after his father's death, although it was not completed when he himself died in 1642. This model appears to have been copied in Italy, but it had little influence on horology, partly because of the circumstances in which it was produced and possibly also because it differed radically from clocks of that period. The crucial event occurred on Christmas Day 1656 when Huygens, quite independently, succeeded in adapting an existing spring-driven table clock so that it was not only controlled by a pendulum but also kept it swinging. In the following year he was granted a privilege or patent for this clock, and several were made by the clockmaker Salomon Coster of The Hague. The use of the pendulum produced a dramatic improvement in timekeeping, reducing the daily error from minutes to seconds, but Huygens was aware that the pendulum was not truly isochronous. This error was magnified by the use of the existing verge escapement, which made the pendulum swing through a large arc. He overcame this defect very elegantly by fitting cheeks at the pendulum suspension point, progressively reducing the effective length of the pendulum as the amplitude increased. Initially the cheeks were shaped empirically, but he was later able to show that they should have a cycloidal shape. The cheeks were not adopted universally because they introduced other defects, and the problem was eventually solved more prosaically by way of new escapements which reduced the swing of the pendulum. Huygens's clocks had another innovatory feature: maintaining power, which kept the clock going while it was being wound.Pendulums could not be used for portable timepieces, which continued to use balances despite their deficiencies. Robert Hooke was probably the first to apply a spring to the balance, but his efforts were not successful. From his work on the pendulum Huygens was well aware of the conditions necessary for isochronism in a vibrating system, and in January 1675, with a flash of inspiration, he realized that this could be achieved by controlling the oscillations of the balance with a spiral spring, an arrangement that is still used in mechanical watches. The first model was made for Huygens in Paris by the clockmaker Isaac Thuret, who attempted to appropriate the invention and patent it himself. Huygens had for many years been trying unsuccessfully to adapt the pendulum clock for use at sea (in order to determine longitude), and he hoped that a balance-spring timekeeper might be better suited for this purpose. However, he was disillusioned as its timekeeping proved to be much more susceptible to changes in temperature than that of the pendulum clock.[br]Principal Honours and DistinctionsFRS 1663. Member of the Académie Royale des Sciences 1666.BibliographyFor his complete works, see Oeuvres complètes de Christian Huygens, 1888–1950, 22 vols, The Hague.1658, Horologium, The Hague; repub., 1970, trans. E.L.Edwardes, AntiquarianHorology 7:35–55 (describes the pendulum clock).1673, Horologium Oscillatorium, Paris; repub., 1986, The Pendulum Clock or Demonstrations Concerning the Motion ofPendula as Applied to Clocks, trans.R.J.Blackwell, Ames.The balance spring watch was first described in Journal des Sçavans 25 February 1675, and translated in Philosophical Transactions of the Royal Society (1675) 4:272–3.Further ReadingH.J.M.Bos, 1972, Dictionary of Scientific Biography, ed. C.C.Gillispie, Vol. 6, New York, pp. 597–613 (for a fuller account of his life and scientific work, but note the incorrect date of his death).R.Plomp, 1979, Spring-Driven Dutch Pendulum Clocks, 1657–1710, Schiedam (describes Huygens's application of the pendulum to the clock).S.A.Bedini, 1991, The Pulse of Time, Florence (describes Galileo's contribution of the pendulum to the clock).J.H.Leopold, 1982, "L"Invention par Christiaan Huygens du ressort spiral réglant pour les montres', Huygens et la France, Paris, pp. 154–7 (describes the application of the balance spring to the watch).A.R.Hall, 1978, "Horology and criticism", Studia Copernica 16:261–81 (discusses Hooke's contribution).DV
См. также в других словарях:
Timing margin — is an expression of the difference between the actual change in a signal and the latest time at which the signal can change in order for the circuit to function correctly. It is used in the design of digital electronics.In this image, the lower… … Wikipedia
Timing attack — In cryptography, a timing attack is a side channel attack in which the attacker attempts to compromise a cryptosystem by analyzing the time taken to execute cryptographic algorithms. The attack exploits the fact that every operation in a computer … Wikipedia
Transponder timing — A Jaguar finish line with Jaguar (Innovative Timing Systems) which utilizes RFID technology through overhead antennas and passive, disposable chips … Wikipedia
Static timing analysis — is a method of computing the expected timing of a digital circuit without requiring simulation. High performance integrated circuits have traditionally been characterized by the clock frequency at which they operate.Gauging the ability of a… … Wikipedia
ignition timing — It is important that the spark coming from the spark plugs ignites the air fuel mixture at the correct moment determined by the manufacturer of the engine. Often this is a few degrees before top dead center (BTDC). Suppose the specs indicate that … Dictionary of automotive terms
Line printer — IBM 1403 line printer, the classic line printer of the mainframe era. The line printer is a form of high speed impact printer in which one line of type is printed at a time. They are mostly associated with the early days of computing, but the… … Wikipedia
Dieseling — or engine run on is a condition that can occur in spark plug, gasoline powered internal combustion engines, whereby the engine keeps running for a short period after being turned off, due to fuel igniting without a spark. Dieseling is so named… … Wikipedia
mistiming — noun Incorrect timing … Wiktionary
Comparison of layout engines (Cascading Style Sheets) — Cascading Style Sheets CSS Animations Dynamic CSS Comparison of layout engines Comparison of stylesheet languages Internet Explorer box model bug CSS Zen Garden The Zen of CSS Design CSSTidy Style sheet Tableless web design Holy Grail (web… … Wikipedia
Life Sciences — ▪ 2009 Introduction Zoology In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… … Universalium
Information technology audit process — Information technology audit process:Generally Accepted Auditing Standards (GAAS)In 1947, the American Institute of Certified Public Accountants (AICPA) adopted GAAS to establish standards for audits. The standards cover the following three… … Wikipedia
