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practical+efficiency

  • 21 с практической точки зрения

    С практической точки зрения
     For practicality, the model should be easily manufactured, readily available, and relatively inexpensive.
     This knowledge, however, is often impossible in practical terms to obtain.
     A fin efficiency of unity is quite reasonable from the standpoint of practice.
    С теоретической точки зрения,... с практической точки зрения
     The extension of an empirical isothermal equation to take account of adiabatic heating may be fundamentally unjustified even though it would appear to be practically convenient.

    Русско-английский научно-технический словарь переводчика > с практической точки зрения

  • 22 с точки зрения

    С точки зрения - from the standpoint of, from a... standpoint; from the perspective of;...wise; in terms of; with respect to (это русское словосочетание можно также переводить соответствующим английским наречием, например: fundamentally, qualitatively; physically)
     During the course of these tests, the superiority of the tangential drain was clearly demonstrated from the standpoint of power loss.
     The foregoing considerations have led to the development of several liner cooling concepts, which now show considerable promise from a cooling-effectiveness standpoint.
     Such a limiting value is recommended as being acceptable from the perspective of both efficiency and emissions.
     From the perspective of the machine designer, they [systems] pose problems that are exciting and challenging.
     The first composition is preferred performance wise (... предпочтительнее с точки зрения работы).
     The results are discussed in terms of their practical significance for grinding machine design and operation.

    Русско-английский научно-технический словарь переводчика > с точки зрения

  • 23 ожидаемые условия эксплуатации

    Услoвия, кoтoрыe стaли извeстны из прaктики или вoзникнoвeниe кoтoрых мoжнo с дoстaтoчным oснoвaниeм прeдвидeть в тeчeниe срoкa службы вoздушнoгo суднa с учeтoм eгo нaзнaчeния. Эти услoвия зaвисят oт мeтeoрoлoгичeскoгo сoстoяния aтмoсфeры, рeльeфa мeстнoсти, функциoнирoвaния вoздушнoгo суднa, квaлификaции пeрсoнaлa и всeх прoчих фaктoрoв, влияющих нa бeзoпaснoсть пoлётa. Oжидaeмыe услoвия эксплуaтaции нe включaют:
    a) экстрeмaльныe услoвия, кoтoрые мoжнo успeшнo избeжaть путeм испoльзoвaния сooтвeтствующих прaвил эксплуатации;
    b) экстрeмaльныe услoвия, кoтoрыe вoзникaют нaстoлькo рeдкo, чтo трeбoвaниe выпoлнять Cтaндaрты в oтнoшeнии этих услoвий привeлo бы к oбeспeчeнию бoлee высoкoгo урoвня лётнoй гoднoсти, чeм этo нeoбхoдимo и прaктичeски oбoснoвaнo.
    Those conditions which are known from experience or which can be reasonably envisaged to occur during the operational life of the aircraft taking into account the operations for which the aircraft is made eligible, the conditions so considered being relative to the meteorological state of the atmosphere, to the configuration of terrain, to the functioning of the aircraft, to the efficiency of personnel and to all the factors affecting safety in flight. Anticipated operating conditions do not include:
    a) those extremes which can be effectively avoided by means of operating procedures; and
    b) those extremes which occur so infrequently that to require the Standards to be met in such extremes would give a higher level of airworthiness than experience has shown to be necessary and practical.
    (AN 8)

    Русско-английский словарь международной организации гражданской авиации > ожидаемые условия эксплуатации

  • 24 хозяйствование хозяйствовани·е

    economic management / managing

    методы хозяйствования — methods of management / of managing the economy, management methods

    экономические методы хозяйствования — economic / performance-based methods of management

    Russian-english dctionary of diplomacy > хозяйствование хозяйствовани·е

  • 25 optimized production technology

    Ops
    a sophisticated production planning and control system, based on finite loading procedures, that concentrates on reducing bottlenecks in the system in order to improve efficiency. The key task of OPT is to increase total systems throughput by realizing existing capacity in other parts of the system. OPT is a practical application of the theory of constraints.
    Abbr. OPT

    The ultimate business dictionary > optimized production technology

  • 26 Ferranti, Sebastian Ziani de

    [br]
    b. 9 April 1864 Liverpool, England
    d. 13 January 1930 Zurich, Switzerland
    [br]
    English manufacturing engineer and inventor, a pioneer and early advocate of high-voltage alternating-current electric-power systems.
    [br]
    Ferranti, who had taken an interest in electrical and mechanical devices from an early age, was educated at St Augustine's College in Ramsgate and for a short time attended evening classes at University College, London. Rather than pursue an academic career, Ferranti, who had intense practical interests, found employment in 1881 with the Siemens Company (see Werner von Siemens) in their experimental department. There he had the opportunity to superintend the installation of electric-lighting plants in various parts of the country. Becoming acquainted with Alfred Thomson, an engineer, Ferranti entered into a short-lived partnership with him to manufacture the Ferranti alternator. This generator, with a unique zig-zag armature, had an efficiency exceeding that of all its rivals. Finding that Sir William Thomson had invented a similar machine, Ferranti formed a company with him to combine the inventions and produce the Ferranti- Thomson machine. For this the Hammond Electric Light and Power Company obtained the sole selling rights.
    In 1885 the Grosvenor Gallery Electricity Supply Corporation was having serious problems with its Gaulard and Gibbs series distribution system. Ferranti, when consulted, reviewed the design and recommended transformers connected across constant-potential mains. In the following year, at the age of 22, he was appointed Engineer to the company and introduced the pattern of electricity supply that was eventually adopted universally. Ambitious plans by Ferranti for London envisaged the location of a generating station of unprecedented size at Deptford, about eight miles (13 km) from the city, a departure from the previous practice of placing stations within the area to be supplied. For this venture the London Electricity Supply Corporation was formed. Ferranti's bold decision to bring the supply from Deptford at the hitherto unheard-of pressure of 10,000 volts required him to design suitable cables, transformers and generators. Ferranti planned generators with 10,000 hp (7,460 kW)engines, but these were abandoned at an advanced stage of construction. Financial difficulties were caused in part when a Board of Trade enquiry in 1889 reduced the area that the company was able to supply. In spite of this adverse situation the enterprise continued on a reduced scale. Leaving the London Electricity Supply Corporation in 1892, Ferranti again started his own business, manufacturing electrical plant. He conceived the use of wax-impregnated paper-insulated cables for high voltages, which formed a landmark in the history of cable development. This method of flexible-cable manufacture was used almost exclusively until synthetic materials became available. In 1892 Ferranti obtained a patent which set out the advantages to be gained by adopting sector-shaped conductors in multi-core cables. This was to be fundamental to the future design and development of such cables.
    A total of 176 patents were taken out by S.Z. de Ferranti. His varied and numerous inventions included a successful mercury-motor energy meter and improvements to textile-yarn produc-tion. A transmission-line phenomenon where the open-circuit voltage at the receiving end of a long line is greater than the sending voltage was named the Ferranti Effect after him.
    [br]
    Principal Honours and Distinctions
    FRS 1927. President, Institution of Electrical Engineers 1910 and 1911. Institution of Electrical Engineers Faraday Medal 1924.
    Bibliography
    18 July 1882, British patent no. 3,419 (Ferranti's first alternator).
    13 December 1892, British patent no. 22,923 (shaped conductors of multi-core cables). 1929, "Electricity in the service of man", Journal of the Institution of Electrical Engineers 67: 125–30.
    Further Reading
    G.Z.de Ferranti and R. Ince, 1934, The Life and Letters of Sebastian Ziani de Ferranti, London.
    A.Ridding, 1964, S.Z.de Ferranti. Pioneer of Electric Power, London: Science Museum and HMSO (a concise biography).
    R.H.Parsons, 1939, Early Days of the Power Station Industry, Cambridge, pp. 21–41.
    GW

    Biographical history of technology > Ferranti, Sebastian Ziani de

  • 27 Poulsen, Valdemar

    [br]
    b. 23 November 1869 Copenhagen, Denmark
    d. 23 July 1942 Gentofte, Denmark
    [br]
    Danish engineer who developed practical magnetic recording and the arc generator for continuous radio waves.
    [br]
    From an early age he was absorbed by phenomena of physics to the exclusion of all other subjects, including mathematics. When choosing his subjects for the final three years in Borgedydskolen in Christianshavn (Copenhagen) before university, he opted for languages and history. At the University of Copenhagen he embarked on the study of medicine in 1889, but broke it off and was apprenticed to the machine firm of A/S Frichs Eftf. in Aarhus. He was employed between 1893 and 1899 as a mechanic and assistant in the laboratory of the Copenhagen Telephone Company KTAS. Eventually he advanced to be Head of the line fault department. This suited his desire for experiment and measurement perfectly. After the invention of the telegraphone in 1898, he left the laboratory and with responsible business people he created Aktieselskabet Telegrafonen, Patent Poulsen in order to develop it further, together with Peder Oluf Pedersen (1874– 1941). Pedersen brought with him the mathematical background which eventually led to his professorship in electronic engineering in 1922.
    The telegraphone was the basis for multinational industrial endeavours after it was demonstrated at the 1900 World's Exhibition in Paris. It must be said that its strength was also its weakness, because the telegraphone was unique in bringing sound recording and reproduction to the telephone field, but the lack of electronic amplifiers delayed its use outside this and the dictation fields (where headphones could be used) until the 1920s. However, commercial interest was great enough to provoke a number of court cases concerning patent infringement, in which Poulsen frequently figured as a witness.
    In 1903–4 Poulsen and Pedersen developed the arc generator for continuous radio waves which was used worldwide for radio transmitters in competition with Marconi's spark-generating system. The inspiration for this work came from the research by William Duddell on the musical arc. Whereas Duddell had proposed the use of the oscillations generated in his electric arc for telegraphy in his 1901 UK patent, Poulsen contributed a chamber of hydrogen and a transverse magnetic field which increased the efficiency remarkably. He filed patent applications on these constructions from 1902 and the first publication in a scientific forum took place at the International Electrical Congress in St Louis, Missouri, in 1904.
    In order to use continuous waves efficiently (the high frequency constituted a carrier), Poulsen developed both a modulator for telegraphy and a detector for the carrier wave. The modulator was such that even the more primitive spark-communication receivers could be used. Later Poulsen and Pedersen developed frequency-shift keying.
    The Amalgamated Radio-Telegraph Company Ltd was launched in London in 1906, combining the developments of Poulsen and those of De Forest Wireless Telegraph Syndicate. Poulsen contributed his English and American patents. When this company was liquidated in 1908, its assets were taken over by Det Kontinentale Syndikat for Poulsen Radio Telegrafi, A/S in Copenhagen (liquidated 1930–1). Some of the patents had been sold to C.Lorenz AG in Berlin, which was very active.
    The arc transmitting system was in use worldwide from about 1910 to 1925, and the power increased from 12 kW to 1,000 kW. In 1921 an exceptional transmitter rated at 1,800 kW was erected on Java for communications with the Netherlands. More than one thousand installations had been in use worldwide. The competing systems were initially spark transmitters (Marconi) and later rotary converters ( Westinghouse). Similar power was available from valve transmitters only much later.
    From c. 1912 Poulsen did not contribute actively to further development. He led a life as a well-respected engineer and scientist and served on several committees. He had his private laboratory and made experiments in the composition of matter and certain resonance phenomena; however, nothing was published. It has recently been suggested that Poulsen could not have been unaware of Oberlin Smith's work and publication in 1888, but his extreme honesty in technical matters indicates that his development was indeed independent. In the case of the arc generator, Poulsen was always extremely frank about the inspiration he gained from earlier developers' work.
    [br]
    Bibliography
    1899, British patent no. 8,961 (the first British telegraphone patent). 1903, British patent no. 15,599 (the first British arc-genera tor patent).
    His scientific publications are few, but fundamental accounts of his contribution are: 1900, "Das Telegraphon", Ann. d. Physik 3:754–60; 1904, "System for producing continuous oscillations", Trans. Int. El. Congr. St. Louis, Vol. II, pp. 963–71.
    Further Reading
    A.Larsen, 1950, Telegrafonen og den Traadløse, Ingeniørvidenskabelige Skrifter no. 2, Copenhagen (provides a very complete, although somewhat confusing, account of Poulsen's contributions; a list of his patents is given on pp. 285–93).
    F.K.Engel, 1990, Documents on the Invention of Magnetic Re cor ding in 1878, New York: Audio Engineering Society, reprint no. 2,914 (G2) (it is here that doubt is expressed about whether Poulsen's ideas were developed independently).
    GB-N

    Biographical history of technology > Poulsen, Valdemar

  • 28 Smeaton, John

    [br]
    b. 8 June 1724 Austhorpe, near Leeds, Yorkshire, England
    d. 28 October 1792 Austhorpe, near Leeds, Yorkshire, England
    [br]
    English mechanical and civil engineer.
    [br]
    As a boy, Smeaton showed mechanical ability, making for himself a number of tools and models. This practical skill was backed by a sound education, probably at Leeds Grammar School. At the age of 16 he entered his father's office; he seemed set to follow his father's profession in the law. In 1742 he went to London to continue his legal studies, but he preferred instead, with his father's reluctant permission, to set up as a scientific instrument maker and dealer and opened a shop of his own in 1748. About this time he began attending meetings of the Royal Society and presented several papers on instruments and mechanical subjects, being elected a Fellow in 1753. His interests were turning towards engineering but were informed by scientific principles grounded in careful and accurate observation.
    In 1755 the second Eddystone lighthouse, on a reef some 14 miles (23 km) off the English coast at Plymouth, was destroyed by fire. The President of the Royal Society was consulted as to a suitable engineer to undertake the task of constructing a new one, and he unhesitatingly suggested Smeaton. Work began in 1756 and was completed in three years to produce the first great wave-swept stone lighthouse. It was constructed of Portland stone blocks, shaped and pegged both together and to the base rock, and bonded by hydraulic cement, scientifically developed by Smeaton. It withstood the storms of the English Channel for over a century, but by 1876 erosion of the rock had weakened the structure and a replacement had to be built. The upper portion of Smeaton's lighthouse was re-erected on a suitable base on Plymouth Hoe, leaving the original base portion on the reef as a memorial to the engineer.
    The Eddystone lighthouse made Smeaton's reputation and from then on he was constantly in demand as a consultant in all kinds of engineering projects. He carried out a number himself, notably the 38 mile (61 km) long Forth and Clyde canal with thirty-nine locks, begun in 1768 but for financial reasons not completed until 1790. In 1774 he took charge of the Ramsgate Harbour works.
    On the mechanical side, Smeaton undertook a systematic study of water-and windmills, to determine the design and construction to achieve the greatest power output. This work issued forth as the paper "An experimental enquiry concerning the natural powers of water and wind to turn mills" and exerted a considerable influence on mill design during the early part of the Industrial Revolution. Between 1753 and 1790 Smeaton constructed no fewer than forty-four mills.
    Meanwhile, in 1756 he had returned to Austhorpe, which continued to be his home base for the rest of his life. In 1767, as a result of the disappointing performance of an engine he had been involved with at New River Head, Islington, London, Smeaton began his important study of the steam-engine. Smeaton was the first to apply scientific principles to the steam-engine and achieved the most notable improvements in its efficiency since its invention by Newcomen, until its radical overhaul by James Watt. To compare the performance of engines quantitatively, he introduced the concept of "duty", i.e. the weight of water that could be raised 1 ft (30 cm) while burning one bushel (84 lb or 38 kg) of coal. The first engine to embody his improvements was erected at Long Benton colliery in Northumberland in 1772, with a duty of 9.45 million pounds, compared to the best figure obtained previously of 7.44 million pounds. One source of heat loss he attributed to inaccurate boring of the cylinder, which he was able to improve through his close association with Carron Ironworks near Falkirk, Scotland.
    [br]
    Principal Honours and Distinctions
    FRS 1753.
    Bibliography
    1759, "An experimental enquiry concerning the natural powers of water and wind to turn mills", Philosophical Transactions of the Royal Society.
    Towards the end of his life, Smeaton intended to write accounts of his many works but only completed A Narrative of the Eddystone Lighthouse, 1791, London.
    Further Reading
    S.Smiles, 1874, Lives of the Engineers: Smeaton and Rennie, London. A.W.Skempton, (ed.), 1981, John Smeaton FRS, London: Thomas Telford. L.T.C.Rolt and J.S.Allen, 1977, The Steam Engine of Thomas Newcomen, 2nd edn, Hartington: Moorland Publishing, esp. pp. 108–18 (gives a good description of his work on the steam-engine).
    LRD

    Biographical history of technology > Smeaton, John

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