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21 attention
1. n внимание, внимательность2. n забота, заботливость, внимательность; уход3. n часто внимание, благосклонность; ухаживание4. n уход; техобслуживаниеold cars need a lot of attention to keep them working — за старыми машинами нужен хороший уход, иначе они выйдут из строя
5. n воен. строевая стойка, положение «смирно»to come to attention — принять положение «смирно»
to call to attention — дать команду «смирно»
to snap to attention — быстро принять стойку «смирно»
position of attention — положение «смирно»
6. n воен. смирно!Синонимический ряд:1. application (noun) application; concentration; consideration; debate; deliberation; heedfulness; study; thoughtfulness2. courtesy (noun) amenity; attentiveness; care; civility; concern; courtesy; gallantry; politeness; respect3. mindfulness (noun) alertness; fascination; focus; mindfulness; thoroughness; watchfulness4. notice (noun) cognisance; cognizance; ear; heed; mark; note; notice; observance; observation; reflection; regard; remark; tactАнтонимический ряд:carelessness; disregard; distraction; inattention; indifference; neglect; remission -
22 cogitation
1. n обдумывание, размышление2. n обыкн. мысли, планыСинонимический ряд:1. meditation (noun) attention; consideration; contemplation; mediation; meditation; rumination; study2. thought (noun) brainwork; cerebration; deliberation; reflection; speculation; thought -
23 consideration
1. n рассмотрение; обсуждениеunder consideration — на рассмотрении, на обсуждении
2. n соображениеto leave out of consideration — не принять во внимание, не учесть
3. n внимание, предупредительность; уважение4. n возмещение, компенсация, вознаграждениеin consideration of — в благодарность за, в виде компенсации за
5. n книжн. важность, значительностьСинонимический ряд:1. attention (noun) advisement; application; attention; attentiveness; concentration; heed; heedfulness; mind; note; notice; thought2. compensation (noun) commission; compensation; fee; payment; percentage; recompense; remuneration; salary; wage3. deliberation (noun) advisement; calculation; considering; contemplation; debate; deliberation; forethought; grounds; reflection; speculation; study4. importance (noun) consequence; importance; interest; moment; significance; value; weight5. motive (noun) cause; motive; reason; spring6. point (noun) concept; factor; issue; notion; point; sympathy; view7. regard (noun) account; admiration; appreciation; esteem; estimation; favor; favour; honor; honour; regard8. thoughtfulness (noun) compassion; concern; considerateness; courtesy; kindliness; respect; solicitude; tact; thoughtfulnessАнтонимический ряд:default; disregard; failure; heedlessness; neglect; negligence; omission -
24 deliberation
1. n обдумывание, взвешивание; размышление2. n обсуждение, дискуссия3. n осторожность, осмотрительность; неторопливостьwith deliberation — осмотрительно; неторопливо, медлительно
Синонимический ряд:1. attention (noun) application; attention; concentration; heed2. consideration (noun) advisement; brainwork; calculation; cerebration; cogitation; consideration; forethought; meditation; pondering; reflection; rumination; speculation; study; thought3. discussion (noun) confabulation; conference; consultation; counsel; debate; discussion; parley; rap; review; ventilation -
25 forethought
1. n продуманность, обдуманность; преднамеренность2. n предусмотрительностьthe success was due to his foresight and forethought — он добился успеха благодаря проницательности и предусмотрительности
3. n попечение, забота4. a редк. задуманный, продуманный заранее; преднамеренныйСинонимический ряд:1. deliberation (noun) considering; contemplation; deliberation; grounds; reflection; speculation; study2. planning (noun) anticipation; consideration; planning; premeditation; provision3. prudence (noun) canniness; caution; circumspection; discreetness; discretion; foresight; precaution; providence; prudenceАнтонимический ряд:impulsiveness; neglect -
26 meditation
1. n размышление2. n медитация3. n редк. созерцаниеСинонимический ряд:contemplation (noun) cerebration; cogitation; consideration; contemplation; deliberation; examination; musing; reflection; rumination; speculation; study; thought; transcendental meditation; visualization -
27 De Forest, Lee
SUBJECT AREA: Broadcasting, Electronics and information technology, Photography, film and optics, Recording, Telecommunications[br]b. 26 August 1873 Council Bluffs, Iowa, USAd. 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 DistinctionsInstitute 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.Bibliography1904, "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 ReadingG.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 -
28 Hero of Alexandria
SUBJECT AREA: Architecture and building, Mechanical, pneumatic and hydraulic engineering, Photography, film and optics, Steam and internal combustion engines[br]fl. c.62 AD Alexandria[br]Alexandrian mathematician and mechanician.[br]Nothing is known of Hero, or Heron, apart from what can be gleaned from the books he wrote. Their scope and style suggest that he was a teacher at the museum or the university of Alexandria, writing textbooks for his students. The longest book, and the one with the greatest technological interest, is Pneumatics. Some of its material is derived from the works of the earlier writers Ctesibius of Alexandria and Philo of Byzantium, but many of the devices described were invented by Hero himself. The introduction recognizes that the air is a body and demonstrates the effects of air pressure, as when air must be allowed to escape from a closed vessel before water can enter. There follow clear descriptions of a variety of mechanical contrivances depending on the effects of either air pressure or heated gases. Most of the devices seem trivial, but such toys or gadgets were popular at the time and Hero is concerned to show how they work. Inventions with a more serious purpose are a fire pump and a water organ. One celebrated gadget is a sphere that is set spinning by jets of steam—an early illustration of the reaction principle on which modern jet propulsion depends.M echanics, known only in an Arabic version, is a textbook expounding the theory and practical skills required by the architect. It deals with a variety of questions of mechanics, such as the statics of a horizontal beam resting on vertical posts, the theory of the centre of gravity and equilibrium, largely derived from Archimedes, and the five ways of applying a relatively small force to exert a much larger one: the lever, winch, pulley, wedge and screw. Practical devices described include sledges for transporting heavy loads, cranes and a screw cutter.Hero's Dioptra describes instruments used in surveying, together with an odometer or device to indicate the distance travelled by a wheeled vehicle. Catoptrics, known only in Latin, deals with the principles of mirrors, plane and curved, enunciating that the angle of incidence is equal to that of reflection. Automata describes two forms of puppet theatre, operated by strings and drums driven by a falling lead weight attached to a rope wound round an axle. Hero's mathematical work lies in the tradition of practical mathematics stretching from the Babylonians through Islam to Renaissance Europe. It is seen most clearly in his Metrica, a treatise on mensuration.Of all his works, Pneumatics was the best known and most influential. It was one of the works of Greek science and technology assimilated by the Arabs, notably Banu Musa ibn Shakir, and was transmitted to medieval Western Europe.[br]BibliographyAll Hero's works have been printed with a German translation in Heronis Alexandrini opera quae supersunt omnia, 1899–1914, 5 vols, Leipzig. The book on pneumatics has been published as The Pneumatics of Hero of Alexandria, 1851, trans. and ed. Bennet Wood-croft, London (facs. repr. 1971, introd. Marie Boas Hall, London and New York).Further ReadingA.G.Drachmann, 1948, "Ktesibios, Philon and Heron: A Study in Ancient Pneumatics", Acta Hist. Sci. Nat. Med. 4, Copenhagen: Munksgaard.T.L.Heath, 1921, A History of Greek Mathematics, Oxford (still useful for his mathematical work).LRD
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