Перевод: со всех языков на все языки

со всех языков на все языки

Transactions of the American Institute of Electrical Engineers

  • 1 Black, Harold Stephen

    [br]
    b. 14 April 1898 Leominster, Massachusetts, USA
    d. 11 December 1983 Summitt, New Jersey, USA
    [br]
    American electrical engineer who discovered that the application of negative feedback to amplifiers improved their stability and reduced distortion.
    [br]
    Black graduated from Worcester Polytechnic Institute, Massachusetts, in 1921 and joined the Western Electric Company laboratories (later the Bell Telephone Laboratories) in New York City. There he worked on a variety of electronic-communication problems. His major contribution was the discovery in 1927 that the application of negative feedback to an amplifier, whereby a fraction of the output signal is fed back to the input in the opposite phase, not only increases the stability of the amplifier but also has the effect of reducing the magnitude of any distortion introduced by it. This discovery has found wide application in the design of audio hi-fi amplifiers and various control systems, and has also given valuable insight into the way in which many animal control functions operate.
    During the Second World War he developed a form of pulse code modulation (PCM) to provide a practicable, secure telephony system for the US Army Signal Corps. From 1963–6, after his retirement from the Bell Labs, he was Principal Research Scientist with General Precision Inc., Little Falls, New Jersey, following which he became an independent consultant in communications. At the time of his death he held over 300 patents.
    [br]
    Principal Honours and Distinctions
    Institute of Electronic and Radio Engineers Lamme Medal 1957.
    Bibliography
    1934, "Stabilised feedback amplifiers", Electrical Engineering 53:114 (describes the principles of negative feedback).
    21 December 1937, US patent no. 2,106,671 (for his negative feedback discovery.
    1947, with J.O.Edson, "Pulse code modulation", Transactions of the American Institute of Electrical Engineers 66:895.
    1946, "A multichannel microwave radio relay system", Transactions of the American Institute of Electrical Engineers 65:798.
    1953, Modulation Theory, New York: D.van Nostrand.
    1988, Laboratory Management: Principles \& Practice, New York: Van Nostrand Rheinhold.
    Further Reading
    For early biographical details see "Harold S. Black, 1957 Lamme Medalist", Electrical Engineering (1958) 77:720; "H.S.Black", Institute of Electrical and Electronics Engineers Spectrum (1977) 54.
    KF

    Biographical history of technology > Black, Harold Stephen

  • 2 Alexanderson, Ernst Frederik Werner

    [br]
    b. 25 January 1878 Uppsala, Sweden
    d. ? May 1975 Schenectady, New York, USA
    [br]
    Swedish-American electrical engineer and prolific radio and television inventor responsible for developing a high-frequency alternator for generating radio waves.
    [br]
    After education in Sweden at the High School and University of Lund and the Royal Institution of Technology in Stockholm, Alexanderson took a postgraduate course at the Berlin-Charlottenburg Engineering College. In 1901 he began work for the Swedish C \& C Electric Company, joining the General Electric Company, Schenectady, New York, the following year. There, in 1906, together with Fessenden, he developed a series of high-power, high-frequency alternators, which had a dramatic effect on radio communications and resulted in the first real radio broadcast. His early interest in television led to working demonstrations in his own home in 1925 and at the General Electric laboratories in 1927, and to the first public demonstration of large-screen (7 ft (2.13 m) diagonal) projection TV in 1930. Another invention of significance was the "amplidyne", a sensitive manufacturing-control system subsequently used during the Second World War for controlling anti-aircraft guns. He also contributed to developments in electric propulsion and radio aerials.
    He retired from General Electric in 1948, but continued television research as a consultant for the Radio Corporation of America (RCA), filing his 321st patent in 1955.
    [br]
    Principal Honours and Distinctions
    Institution of Radio Engineers Medal of Honour 1919. President, IERE 1921. Edison Medal 1944.
    Bibliography
    Publications relating to his work in the early days of radio include: "Magnetic properties of iron at frequencies up to 200,000 cycles", Transactions of the American Institute of Electrical Engineers (1911) 30: 2,443.
    "Transatlantic radio communication", Transactions of the American Institute of Electrical
    Engineers (1919) 38:1,269.
    The amplidyne is described in E.Alexanderson, M.Edwards and K.Boura, 1940, "Dynamo-electric amplifier for power control", Transactions of the American
    Institution of Electrical Engineers 59:937.
    Further Reading
    E.Hawkes, 1927, Pioneers of Wireless, Methuen (provides an account of Alexanderson's work on radio).
    J.H.Udelson, 1982, The Great Television Race: A History of the American Television Industry 1925–1941, University of Alabama Press (provides further details of his contribution to the development of television).
    KF

    Biographical history of technology > Alexanderson, Ernst Frederik Werner

  • 3 Kennelly, Arthur Edwin

    [br]
    b. 17 December 1871 Colaba, Bombay, India
    d. 18 June 1939 Boston, Massachusetts, USA
    [br]
    Anglo-American electrical engineer who predicted the ionosphere and developed mathematical analysis for electronic circuits.
    [br]
    As a young man, Kennelly worked as office boy for a London engineering society, as an electrician and on a cable-laying ship. In 1887 he went to work for Thomas Edison at West Orange, New Jersey, USA, becoming his chief assistant. In 1894, with Edwin J.Houston, he formed the Philadelphia company of Houston and Kennelly, but eight years later he took up the Chair of Electrical Engineering at Harvard, a post he held until his retirement in 1930. In 1902 he noticed that the radio signals received by Marconi in Nova Scotia from the transmitter in England were stronger than predicted and postulated a reflecting ionized layer in the upper atmosphere. Almost simultaneously the same prediction was made in England by Heaviside, so the layer became known as the Kennelly-Heaviside layer. Throughout most of his working life Kennelly was concerned with the application of mathematical techniques, particularly the use of complex theory, to the analysis of electrical circuits. With others he also contributed to an understanding of the high-frequency skin-effect in conductors.
    [br]
    Principal Honours and Distinctions
    President, American Institute of Electrical Engineers 1898–1900. President, Institution of Electrical Engineers 1916. Institute of Electrical and Electronics Engineers Medal of Honour 1932; Edison Medal 1933.
    Bibliography
    1915, with F.A.Laws \& P.H.Pierce "Experimental research on the skin effect in conductors", Transactions of the American Institute of Electrical Engineers 34:1,953.
    1924, Hyperbolic Functions as Applied to Electrical Engineering.
    1924, Check Atlas of Complex Hyperbolic \& Circular Functions (both on mathematics for circuit analysis).
    Further Reading
    K.Davies, 1990, Ionospheric Radio, London: Peter Peregrinus. See also Appleton, Sir Edward Victor.
    KF

    Biographical history of technology > Kennelly, Arthur Edwin

  • 4 Warren, Henry Ellis

    SUBJECT AREA: Horology
    [br]
    b. 21 May 1872 Boston, Massachusetts, USA
    d. 21 September 1957 Ashland, Massachusetts, USA
    [br]
    American electrical engineer who invented the mains electric synchronous clock.
    [br]
    Warren studied electrical engineering at the Boston Institute of Technology (later to become the Massachusetts Institute of Technology) and graduated in 1894. In 1912 he formed the Warren Electric Clock Company to make a battery-powered clock that he had patented a few years earlier. The name was changed to the Warren Telechron (time at a distance) Company after he had started to produce synchronous clocks.
    In 1840 Charles Wheatstone had produced an electric master clock that produced an alternating current with a frequency of one cycle per second and which was used to drive slave dials. This system was not successful, but when Ferranti introduced the first alternating current power generator at Deptford in 1895 Hope-Jones saw in it a means of distributing time. This did not materialize immediately because the power generators did not control the frequency of the current with sufficient accuracy, and a reliable motor whose speed was related to this frequency was not available. In 1916 Warren solved both problems: he produced a reliable self-starting synchronous electric motor and he also made a master clock which could be used at the power station to control accurately the frequency of the supply. Initially the power-generating companies were reluctant to support the synchronous clock because it imposed a liability to control the frequency of the supply and the gain was likely to be small because it was very frugal in its use of power. However, with the advent of the grid system, when several generators were connected together, it became imperative to control the frequency; it was realized that although the power consumption of individual clocks was small, collectively it could be significant as they ran continuously. By the end of the 1930s more than half the clocks sold in the USA were of the synchronous type. The Warren synchronous clock was introduced into Great Britain in 1927, following the setting up of a grid system by the Electricity Commission.
    [br]
    Principal Honours and Distinctions
    Franklin Institute John Price Wetherill Medal. American Institute of Electrical Engineers Lamme Medal.
    Bibliography
    The patents for the synchronous motor are US patent nos. 1,283,432, 1,283,433 and 1,283,435, and those for the master clock are 1,283,431, 1,409,502 and 1,502,493 of 29 October 1918 onwards.
    1919, "Utilising the time characteristics of alternating current", Transactions of the American Institute of Electrical Engineers 38:767–81 (Warren's first description of his system).
    Further Reading
    J.M.Anderson, 1991, "Henry Ellis Warren and his master clocks", National Association of Watch and Clock Collectors Bulletin 33:375–95 (provides biographical and technical details).
    DV

    Biographical history of technology > Warren, Henry Ellis

  • 5 Nyquist, Harry

    [br]
    b. 7 February 1889 Nilsby, Sweden
    d. 4 April 1976 Texas, USA
    [br]
    Swedish-American engineer who established the formula for thermal noise in electrical circuits and the stability criterion for feedback amplifiers.
    [br]
    Nyquist (original family name Nykvist) emigrated from Sweden to the USA when he was 18 years old and settled in Minnesota. After teaching for a time, he studied electrical engineering at the University of North Dakota, gaining his first and Master's degrees in 1915 and 1916, and his PhD from Yale in 1917. He then joined the American Telegraph \& Telephone Company, moving to its Bell Laboratories in 1934 and remaining there until his retirement in 1954. A prolific inventor, he made many contributions to communication engineering, including the invention of vestigial-side band transmission. In the late 1920s he analysed the behaviour of analogue and digital signals in communication circuits, and in 1928 he showed that the thermal noise per unit bandwidth is given by 4 kT, where k is Boltzmann's constant and T the absolute temperature. However, he is best known for the Nyquist Criterion, which defines the conditions necessary for the stable, oscillation-free operation of amplifiers with a closed feedback loop. The problem of how to realize these conditions was investigated by his colleague Hendrik Bode.
    [br]
    Principal Honours and Distinctions
    Franklin Institute Medal 1960. Institute of Electrical and Electronics Engineers Medal of Honour 1960; Mervin J.Kelly Award 1961.
    Bibliography
    1924, "Certain factors affecting telegraph speed", Bell System Technical Journal 3:324. 1928, "Certain topics in telegraph transmission theory", Transactions of the American
    Institute of Electrical Engineers 47:617.
    1928, "Thermal agitation of electric charge in conductors", Physical Review 32:110. 1932, "Regeneration theory", Bell System Technical Journal 11:126.
    1940, with K.Pfleger, "Effect of the quadrature component in single-sideband transmission", Bell System Technical Journal 19:63.
    Further Reading
    Bell Telephone Laboratories, 1975, Mission Communications.
    KF

    Biographical history of technology > Nyquist, Harry

  • 6 Colpitts, Edwin Henry

    [br]
    b. 9 January 1872 Pointe de Bute, Canada
    d. 6 March 1949 Orange, New Jersey, USA
    [br]
    Canadian physicist and electrical engineer responsible for important developments in electronic-circuit technology.
    [br]
    Colpitts obtained Bachelor's degrees at Mount Allison University, Sackville, New Brunswick, and Harvard in 1894 and 1896, respectively, followed by a Master's degree at Harvard in 1897. After two years as assistant to the professor of physics there, he joined the American Bell Telephone Company. When the Bell Company was reorganized in 1907, he moved to the Western Electric branch of the company in New York as Head of the Physical Laboratories. In 1911 he became a director of the Research Laboratories, and in 1917 he became Assistant Chief Engineer of the company. During this time he invented both the push-pull amplifier and the Colpitts oscillator, both major developments in communications. In 1917, during the First World War, he spent some time in France helping to set up the US Signal Corps Research Laboratories. Afterwards he continued to do much, both technically and as a manager, to place telephone communications on a firm scientific basis, retiring as Vice-President of the Bell Telephone Laboratories in 1937. With the outbreak of the Second World War in 1941 he was recalled from retirement and appointed Director of the Engineering Foundation to work on submarine warfare techniques, particularly echo-ranging.
    [br]
    Principal Honours and Distinctions
    Order of the Rising Sun, Japan, 1938. US Medal of Merit 1948.
    Bibliography
    1919, with E.B.Craft, "Radio telephony", Proceedings of the American Institution of Electrical Engineers 38:337.
    1921, with O.B.Blackwell, "Carrier current telephony and telegraphy", American Institute of Electrical Engineers Transactions 40:205.
    11 September 1915, US reissue patent no. 15,538 (control device for radio signalling).
    28 August 1922, US patent no. 1,479,638 (multiple signal reception).
    Further Reading
    M.D.Fagen, 1975, A History of Engineering \& Science in the Bell System, Vol. 1, Bell Laboratories.
    KF

    Biographical history of technology > Colpitts, Edwin Henry

  • 7 De Forest, Lee

    [br]
    b. 26 August 1873 Council Bluffs, Iowa, USA
    d. 30 June 1961 Hollywood, California, USA
    [br]
    American electrical engineer and inventor principally known for his invention of the Audion, or triode, vacuum tube; also a pioneer of sound in the cinema.
    [br]
    De Forest was born into the family of a Congregational minister that moved to Alabama in 1879 when the father became President of a college for African-Americans; this was a position that led to the family's social ostracism by the white community. By the time he was 13 years old, De Forest was already a keen mechanical inventor, and in 1893, rejecting his father's plan for him to become a clergyman, he entered the Sheffield Scientific School of Yale University. Following his first degree, he went on to study the propagation of electromagnetic waves, gaining a PhD in physics in 1899 for his thesis on the "Reflection of Hertzian Waves from the Ends of Parallel Wires", probably the first US thesis in the field of radio.
    He then joined the Western Electric Company in Chicago where he helped develop the infant technology of wireless, working his way up from a modest post in the production area to a position in the experimental laboratory. There, working alone after normal working hours, he developed a detector of electromagnetic waves based on an electrolytic device similar to that already invented by Fleming in England. Recognizing his talents, a number of financial backers enabled him to set up his own business in 1902 under the name of De Forest Wireless Telegraphy Company; he was soon demonstrating wireless telegraphy to interested parties and entering into competition with the American Marconi Company.
    Despite the failure of this company because of fraud by his partners, he continued his experiments; in 1907, by adding a third electrode, a wire mesh, between the anode and cathode of the thermionic diode invented by Fleming in 1904, he was able to produce the amplifying device now known as the triode valve and achieve a sensitivity of radio-signal reception much greater than possible with the passive carborundum and electrolytic detectors hitherto available. Patented under the name Audion, this new vacuum device was soon successfully used for experimental broadcasts of music and speech in New York and Paris. The invention of the Audion has been described as the beginning of the electronic era. Although much development work was required before its full potential was realized, the Audion opened the way to progress in all areas of sound transmission, recording and reproduction. The patent was challenged by Fleming and it was not until 1943 that De Forest's claim was finally recognized.
    Overcoming the near failure of his new company, the De Forest Radio Telephone Company, as well as unsuccessful charges of fraudulent promotion of the Audion, he continued to exploit the potential of his invention. By 1912 he had used transformer-coupling of several Audion stages to achieve high gain at radio frequencies, making long-distance communication a practical proposition, and had applied positive feedback from the Audion output anode to its input grid to realize a stable transmitter oscillator and modulator. These successes led to prolonged patent litigation with Edwin Armstrong and others, and he eventually sold the manufacturing rights, in retrospect often for a pittance.
    During the early 1920s De Forest began a fruitful association with T.W.Case, who for around ten years had been working to perfect a moving-picture sound system. De Forest claimed to have had an interest in sound films as early as 1900, and Case now began to supply him with photoelectric cells and primitive sound cameras. He eventually devised a variable-density sound-on-film system utilizing a glow-discharge modulator, the Photion. By 1926 De Forest's Phonofilm had been successfully demonstrated in over fifty theatres and this system became the basis of Movietone. Though his ideas were on the right lines, the technology was insufficiently developed and it was left to others to produce a system acceptable to the film industry. However, De Forest had played a key role in transforming the nature of the film industry; within a space of five years the production of silent films had all but ceased.
    In the following decade De Forest applied the Audion to the development of medical diathermy. Finally, after spending most of his working life as an independent inventor and entrepreneur, he worked for a time during the Second World War at the Bell Telephone Laboratories on military applications of electronics.
    [br]
    Principal Honours and Distinctions
    Institute of Electronic and Radio Engineers Medal of Honour 1922. President, Institute of Electronic and Radio Engineers 1930. Institute of Electrical and Electronics Engineers Edison Medal 1946.
    Bibliography
    1904, "Electrolytic detectors", Electrician 54:94 (describes the electrolytic detector). 1907, US patent no. 841,387 (the Audion).
    1950, Father of Radio, Chicago: WIlcox \& Follett (autobiography).
    De Forest gave his own account of the development of his sound-on-film system in a series of articles: 1923. "The Phonofilm", Transactions of the Society of Motion Picture Engineers 16 (May): 61–75; 1924. "Phonofilm progress", Transactions of the Society of Motion Picture Engineers 20:17–19; 1927, "Recent developments in the Phonofilm", Transactions of the Society of Motion Picture Engineers 27:64–76; 1941, "Pioneering in talking pictures", Journal of the Society of Motion Picture Engineers 36 (January): 41–9.
    Further Reading
    G.Carneal, 1930, A Conqueror of Space (biography).
    I.Levine, 1964, Electronics Pioneer, Lee De Forest (biography).
    E.I.Sponable, 1947, "Historical development of sound films", Journal of the Society of Motion Picture Engineers 48 (April): 275–303 (an authoritative account of De Forest's sound-film work, by Case's assistant).
    W.R.McLaurin, 1949, Invention and Innovation in the Radio Industry.
    C.F.Booth, 1955, "Fleming and De Forest. An appreciation", in Thermionic Valves 1904– 1954, IEE.
    V.J.Phillips, 1980, Early Radio Detectors, London: Peter Peregrinus.
    KF / JW

    Biographical history of technology > De Forest, Lee

См. также в других словарях:

  • American Institute of Mining, Metallurgical, and Petroleum Engineers — The American Institute of Mining, Metallurgical, and Petroleum Engineers (AIME) is a professional body for mining and metallurgy, with 90,000 members. It was founded in 1871 by 22 mining engineers in Wilkes Barre, Pennsylvania, United States,… …   Wikipedia

  • Invention of radio — Great Radio Controversy redirects here. For the album by the band Tesla, see The Great Radio Controversy. Contents 1 Physics of wireless signalling 2 Theory of electromagnetism …   Wikipedia

  • Wireless energy transfer — or wireless power is the transmission of electrical energy from a power source to an electrical load without artificial interconnecting conductors. Wireless transmission is useful in cases where interconnecting wires are inconvenient, hazardous,… …   Wikipedia

  • History of computing hardware — Computing hardware is a platform for information processing (block diagram) The history of computing hardware is the record of the ongoing effort to make computer hardware faster, cheaper, and capable of storing more data. Computing hardware… …   Wikipedia

  • List of University of Michigan alumni — There are more than 425,000 living alumni of the University of Michigan. Famous alumni include the father of the iPod, the founders of Sun Microsystems and Google, the father of information theory, the voice of Darth Vader, the first doctor… …   Wikipedia

  • Claude Shannon — Claude Elwood Shannon (1916 2001) Born April …   Wikipedia

  • Reginald Fessenden — Infobox Celebrity name = Reginald Fessenden caption = The Father of Radio Broadcasting birth date = birth date|1866|10|6|mf=y birth place = East Bolton, Quebec, Canada death date = death date and age|1932|7|22|1866|10|6|mf=y death place = Bermuda …   Wikipedia

  • Charles Concordia — Born June 20, 1908(1908 06 20) Died December 25, 2003(2003 12 25) (aged 95) …   Wikipedia

  • Anthony Reckenzaun — (1850 1893) was an electrical engineer who worked in the UK and the USA.Reckenzaun worked on electric tramcars and electric boats. He is probably best known for applying worm gear drive to tramcars. This was not a great success on full size… …   Wikipedia

  • George Ashley Campbell — Infobox Scientist name = George Ashley Campbell caption = birth date = birth date|1870|11|27 birth place = Hastings, Minnesota death date = death date and age|1954|11|10|1870|11|27 death place = residence = United States nationality =American… …   Wikipedia

  • Loading coil — In electronics, a loading coil or load coil is a coil (inductor) that does not provide coupling to any other circuit, but is inserted in a circuit to increase its inductance. The need was discovered by Oliver Heaviside in studying the… …   Wikipedia

Поделиться ссылкой на выделенное

Прямая ссылка:
… Нажмите правой клавишей мыши и выберите «Копировать ссылку»