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1 Shockley, William Bradford
[br]b. 13 February 1910 London, Englandd. 12 August 1989, Palo Alto, California, USA.[br]American physicist who developed the junction transistor from the point contact transistor and was joint winner (with John Bardeen and Walter H. Brattain) of the 1956 Nobel Prize for physics.[br]The son of a mining engineer, Shockley graduated from the California Institute of Technology in 1932 and in 1936 obtained his PhD at the Massachusetts Institute of Technology. In that year, he joined the staff of Bell Telephone Laboratories.Since the early days of radio, crystals of silicon or similar materials had been used to rectify alternating current supply until these were displaced by thermionic valves or tubes. Shockley, with Bardeen and Brattain, found that crystals of germanium containing traces of certain impurities formed far better rectifiers than crystals of the material in its pure form. The resulting device, the transistor, could also be used to amplify the current; its name is derived from its ability to transfer current across a resistor. The transistor, being so much smaller than the thermionic valve which it replaced, led to the miniaturization of electronic appliances. Another advantage was that a transistorized device needed no period of warming up, such as was necessary with a thermionic valve before it would operate. The dispersal of the heat generated by a multiplicity of thermionic valves such as were present in early computers was another problem obviated by the advent of the transistor.Shockley was responsible for much development in the field of semiconductors. He was Deputy Director of the Weapons Systems Evaluation Group of the US Department of Defense (1954–5), and in 1963 he was appointed the first Poniatoff Professor of Engineering Science at Stanford University, California. During the late 1960s Shockley became a controversial figure for expressing his unorthodox views on genetics, such as that black people were inherently less intelligent than white people, and that the population explosion spread "bad" genes at the expense of "good" genes; he supported the idea of a sperm bank from Nobel Prize winners, voluntary sterilization and the restriction of interracial marriages.[br]Principal Honours and DistinctionsNobel Prize for Physics 1956.Further ReadingI.Asimov (ed.), 1982, Biographical Encyclopedia of Science and Technology, New York: Doubleday \& Co.IMcNBiographical history of technology > Shockley, William Bradford
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2 Staudinger, Hermann
[br]b. 23 March 1881 Worms, Germanyd. 8 September 1965 Freiberg im Breisgau, Germany[br]German chemist, founder of polymer chemistry.[br]Staudinger studied chemistry at the universities of Halle, Darmstadt and Munich, originally as a preparation for botanical studies, but chemistry claimed his full attention. He followed an academic career, with professorships at Karlsruhe in 1908, Zurich in 1912 and Freiberg from 1926 until his retirement in 1951. Staudinger began his work as an organic chemist by following well-established lines of research, but from 1920 he struck out in a new direction. Until that time, rubber and other apparently non-crystalline materials with high molecular weight were supposed to consist of a disordered collection of small molecules. Staudinger investigated the structure of rubber and realized that it was made up of very large molecules with many basic groups of atoms held together by normal chemical bonds. Substances formed in this way are known as "polymers". Staudinger's views first met with opposition, but he developed methods of determining the molecular weights of these "high polymers". Finally, the introduction of X-ray crystallographic investigation of chemical structure confirmed his views. This discovery has proved to be the basis of a new branch of chemistry with momentous consequences for industry. From it stemmed the synthetic rubber, plastics, fibres, adhesives and other industries, with all their multifarious applications in everyday life. The Staudinger equation, linking viscosity with molecular weight, is still widely used, albeit with some reservations, in the polymer industry.During the 1930s, Staudinger turned his attention to biopolymers and foresaw the discovery some twenty years later that these macromolecules were the building blocks of life. In 1953 he belatedly received the Nobel Prize in Chemistry.[br]Principal Honours and DistinctionsNobel Prize in Chemistry 1953.Bibliography1961, Arbeitserinnerungen, Heidelberg; pub. in English, 1970 as From Organic Chemistry to Macromolecules, New York (includes a comprehensive bibliography of 644 items).Further ReadingE.Farber, 1963, Nobel Prize Winners in Chemistry, New York.R.C.Olby, 1970, "The macromolecular concept and the origins of molecular biology", J. Chem. Ed. 47:168–74.LRD -
3 Schawlow, Arthur Leonard
[br]b. 5 May 1921 Mount Vernon, New York, USA[br]American physicist involved in laser-spectroscopy research.[br]When Arthur L.Schawlow was 3 years old his family moved to Canada: it was in Toronto that he received his education, graduating from the University of Toronto with a BA in physics in 1941. He was awarded an MA in 1942, taught classes for military personnel at the University until 1944 and worked for a year on radar equipment. He returned to the University of Toronto in 1945 to carry out research on optical spectroscopy and received his PhD in 1949. From 1949 to 1951 he held a postgraduate fellowship at Columbia University, where he worked with Charles H. Townes on microwave spectroscopy. From 1951 to 1961 he was a research physicist at the Bell Telephone Laboratories, working mainly on superconductivity, but he maintained his association with Townes, who had pioneered the maser (an acronym of microwave amplification by stimulated emission of radiation). In a paper published in Physical Review in December 1958, Townes and Schawlow suggested the possibility of a development into optical frequencies or an optical maser, later known as a laser (an acronym of light amplification by stimulated emission of radiation). In 1960 the first such device was made by Theodore H. Maiman. In 1960 Schawlow returned to Columbia University as a visiting professor and in the following year was appointed Professor of Physics at Stanford University, where he continued his researches in laser spectroscopy. He is a member of the National Academy of Sciences, the American Physical Society, the Optical Society of America and the Institute of Electrical and Electronic Engineers.[br]Principal Honours and DistinctionsNobel Prize for Physics 1981. Franklin Institute Stuart Ballantine Medal 1962. Institute of Physics of London Thomas Young Medal and Prize 1963. Institute of Electrical and Electronics Engineers Morris N.Liebmann Memorial Prize 1964. Optical Society of America Frederick Ives Medal 1976. Honorary degrees from the State University of Ghent, the University of Bradford and the University of Toronto.BibliographySchawlow is the author of many scientific papers and, with Charles H.Townes, ofMicrowave Spectroscopy (1955).Further ReadingT.Wasson (ed.), 1987, Nobel Prize Winners, New York, pp. 930–3 (contains a short biography).RTSBiographical history of technology > Schawlow, Arthur Leonard
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4 Townes, Charles Hard
SUBJECT AREA: Electronics and information technology[br]b. 28 July 1915 Greenville, South Carolina, USA[br]American physicist who developed the maser and contributed to the development of the laser.[br]Charles H.Townes entered Furman University, Greenville, at the early age of 16 and in 1935 obtained a BA in modern languages and a BS in physics. After a year of postgraduate study at Duke University, he received a master's degree in physics in 1936. He then went on to the California Institute of Technology, where he obtained a PhD in 1939. From 1939 to 1947 he worked at the Bell Telephone Laboratories, mainly on airborne radar, although he also did some work on radio astronomy. In 1948 he joined Columbia University as Associate Professor of Physics and in 1950 was appointed a full professor. He was Director of the University's Radiation Laboratory from 1950 to 1952, and from 1952 to 1955 he was Chairman of the Physics Department.To meet the need for an oscillator generating very short wavelength electromagnetic radiation, Townes in 1951 realized that use could be made of the different natural energy levels of atoms and molecules. The practical application of this idea was achieved in his laboratory in 1953 using ammonia gas to make the device known as a maser (an acronym of microwave amplification by stimulated emission of radiation). The maser was developed in the next few years and in 1958, in a joint paper with his brother-in-law Arthur L. Schawlow, Townes suggested the possibility of a further development into optical frequencies or an optical maser, later known as a laser (an acronym of light amplification by stimulated emission of radiation). Two years later the first such device was made by Theodore H. Maiman.In 1959 Townes was given leave from Columbia University to serve as Vice-President and Director of Research at the Institute for Defense Analyses until 1961. He was then appointed Provost and Professor of Physics at the Massachusetts Institute of Technology. In 1967 he became University Professor of Physics at the University of California, where he has extended his research interests in the field of microwave and infra-red astronomy. He is a member of the National Academy of Sciences, the Institute of Electrical and Electronics Engineers and the American Astronomical Society.[br]Principal Honours and DistinctionsNobel Prize for Physics 1964. Foreign Member, Royal Society of London. President, American Physical Society 1967. Townes has received many awards from American and other scientific societies and institutions and honorary degrees from more than twenty universities.BibliographyTownes is the author of many scientific papers and, with Arthur L.Schawlow, ofMicrowave Spectroscopy (1955).1980, entry, McGraw-Hill Modern Scientists and Engineers, Part 3, New York, pp. 227– 8 (autobiography).1991, entry, The Nobel Century, London, p. 106 (autobiography).Further ReadingT.Wasson (ed.), 1987, Nobel Prize Winners, New York, pp. 1,071–3 (contains a short biography).RTS -
5 Guillaume, Charles-Edouard
[br]b. 15 February 1861 Fleurier, Switzerlandd. 13 June 1938 Sèvres, France[br]Swiss physicist who developed two alloys, "invar" and "elinvar", used for the temperature compensation of clocks and watches.[br]Guillaume came from a family of clock-and watchmakers. He was educated at the Gymnasium in Neuchâtel and at Zurich Polytechnic, from which he received his doctorate in 1883 for a thesis on electrolytic capacitors. In the same year he joined the International Bureau of Weights and Measures at Sèvres in France, where he was to spend the rest of his working life. He retired as Director in 1936. At the bureau he was involved in distributing the national standards of the metre to countries subscribing to the General Conference on Weights and Measures that had been held in 1889. This made him aware of the crucial effect of thermal expansion on the lengths of the standards and he was prompted to look for alternative materials that would be less costly than the platinum alloys which had been used. While studying nickel steels he made the surprising discovery that the thermal expansion of certain alloy compositions was less than that of the constituent metals. This led to the development of a steel containing about 36 per cent nickel that had a very low thermal coefficient of expansion. This alloy was subsequently named "invar", an abbreviation of invariable. It was well known that changes in temperature affected the timekeeping of clocks by altering the length of the pendulum, and various attempts had been made to overcome this defect, most notably the mercury-compensated pendulum of Graham and the gridiron pendulum of Harrison. However, an invar pendulum offered a simpler and more effective method of temperature compensation and was used almost exclusively for pendulum clocks of the highest precision.Changes in temperature can also affect the timekeeping of watches and chronometers, but this is due mainly to changes in the elasticity or stiffness of the balance spring rather than to changes in the size of the balance itself. To compensate for this effect Guillaume developed another more complex nickel alloy, "elinvar" (elasticity invariable), whose elasticity remained almost constant with changes in temperature. This had two practical consequences: the construction of watches could be simplified (by using monometallic balances) and more accurate chronometers could be made.[br]Principal Honours and DistinctionsNobel Prize for Physics 1920. Corresponding member of the Académie des Sciences. Grand Officier de la Légion d'honneur 1937. Physical Society Duddell Medal 1928. British Horological Institute Gold Medal 1930.Bibliography1897, "Sur la dilation des aciers au nickel", Comptes rendus hebdomadaires des séances de l'Académie des sciences 124:176.1903, "Variations du module d"élasticité des aciers au nickel', Comptes rendushebdomadaires des séances de l'Académie des sciences 136:498."Les aciers au nickel et leurs applications à l'horlogerie", in J.Grossmann, Horlogerie théorique, Paris, Vol. II, pp. 361–414 (describes the application of invar and elinvar to horology).Sir Richard Glazebrook (ed.), 1923 "Invar and Elinvar", Dictionary of Applied Physics, 5 vols, London, Vol. V, pp. 320–7 (a succinct account in English).Further ReadingR.M.Hawthorne, 1989, Nobel Prize Winners, Physics, 1901–1937, ed. F.N.Magill, Pasadena, Salem Press, pp. 244–51.See also: Le Roy, PierreDVBiographical history of technology > Guillaume, Charles-Edouard
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6 ganador
adj.winning.m.winner, prizewinner, gainer, lucky winner.* * *► adjetivo1 winning► nombre masculino,nombre femenino1 winner* * *1. (f. - ganadora)noun2. (f. - ganadora)adj.* * *ganador, -a1.ADJ (=vencedor) winning, victoriousapostar a ganador y colocado — to back (a horse) each way, back for a win and a place
2.SM / F winner; (Econ) earner; [que se beneficia] gainer* * *I- dora adjetivo <equipo/caballo> winning (before n)II- dora masculino, femenino winner* * *= winner, gainer, winning, victorious, victor.Ex. The jungle fighter views his life and work in terms of winners and losers, with power as his goal.Ex. Is this claim based on a principle to which you would have subscribed even if, as far as you know, you were as likely to be a loser as a gainer by its implication?.Ex. The winning entry in the competition to produce a design for the main library building is described and a floor plan of the building is presented.Ex. The author offers an interpretation of why in professional wrestling the bad guy is often victorious, by whatever means necessary including foul play.Ex. Sports are about winning and losing and that they will always demand great victors and tragic losers.----* ganador de la lotería = lottery winner.* ganador de premio = award winner.* ganador de un premio = awardee.* ganador de votos = vote-getter.* ganador sorpresa = dark horse.* lista de ganadores = roll of honour.* * *I- dora adjetivo <equipo/caballo> winning (before n)II- dora masculino, femenino winner* * *= winner, gainer, winning, victorious, victor.Ex: The jungle fighter views his life and work in terms of winners and losers, with power as his goal.
Ex: Is this claim based on a principle to which you would have subscribed even if, as far as you know, you were as likely to be a loser as a gainer by its implication?.Ex: The winning entry in the competition to produce a design for the main library building is described and a floor plan of the building is presented.Ex: The author offers an interpretation of why in professional wrestling the bad guy is often victorious, by whatever means necessary including foul play.Ex: Sports are about winning and losing and that they will always demand great victors and tragic losers.* ganador de la lotería = lottery winner.* ganador de premio = award winner.* ganador de un premio = awardee.* ganador de votos = vote-getter.* ganador sorpresa = dark horse.* lista de ganadores = roll of honour.* * *‹equipo/caballo› winning ( before n)la película ganadora del Oscar the Oscar-winning filmmasculine, femininewinner* * *
ganador
la película ganadora del Oscar the Oscar-winning film
■ sustantivo masculino, femenino
winner
ganador,-ora
I adjetivo winning
II sustantivo masculino y femenino winner
' ganador' also found in these entries:
Spanish:
agraciada
- agraciado
- ganadora
- ganarse
- quién
- vencedor
- vencedora
- Nobel
English:
outright
- prizewinner
- winner
- winning
- entry
- prize
* * *ganador, -ora♦ adjwinning;el escritor ganador del Nobel the Nobel prize-winning writer♦ nm,fwinner* * *I adj winningII m, ganadora f winner* * *: winning: winner* * *ganador1 adj winningganador2 n winnery el ganador es... and the winner is...
См. также в других словарях:
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