-
41 Barnack, Oskar
SUBJECT AREA: Photography, film and optics[br]b. 1879 Berlin, Germanyd. January 1936 Wetzlar, Germany[br]German camera designer who conceived the first Leica camera and many subsequent models.[br]Oskar Barnack was an optical engineer, introspective and in poor health, when in 1910 he was invited through the good offices of his friend the mechanical engineer Emil Mechau, who worked for Ernst Leitz, to join the company at Wetzlar to work on research into microscope design. He was engaged after a week's trial, and on 2 January 1911 he was put in charge of microscope research. He was an enthusiastic photographer, but excursions with his large and heavy plate camera equipment taxed his strength. In 1912, Mechau was working on a revolutionary film projector design and needed film to test it. Barnack suggested that it was not necessary to buy an expensive commercial machine— why not make one? Leitz agreed, and Barnack constructed a 35 mm movie camera, which he used to cover events in and around Wetzlar.The exposure problems he encountered with the variable sensitivity of the cine film led him to consider the design of a still camera in which short lengths of film could be tested before shooting—a kind of exposure-meter camera. Dissatisfied with the poor picture quality of his first model, which took the standard cine frame of 18×24 mm, he built a new model in which the frame size was doubled to 36×24 mm. It used a simple focal-plane shutter adjustable to 1/500 of a second, and a Zeiss Milar lens of 42 mm focal length. This is what is now known as the UR-Leica. Using his new camera, 1/250 of the weight of his plate equipment, Barnack made many photographs around Wetzlar, giving postcard-sized prints of good quality.Ernst Leitz Junior was lent the camera for his trip in June 1914 to America, where he was urged to put it into production. Visiting George Eastman in Rochester, Leitz passed on Barnack's requests for film of finer grain and better quality. The First World War put an end to the chances of developing the design at that time. As Germany emerged from the postwar chaos, Leitz Junior, then in charge of the firm, took Barnack off microscope work to design prototypes for a commercial model. Leitz's Chief Optician, Max Berek, designed a new lens, the f3.5 Elmax, for the new camera. They settled on the name Leica, and the first production models went on show at the Leipzig Spring Fair in 1925. By the end of the year, 1,000 cameras had been shipped, despite costing about two months' good wages.The Leica camera established 35 mm still photography as a practical proposition, and film manufacturers began to create the special fine-grain films that Barnack had longed for. He continued to improve the design, and a succession of new Leica models appeared with new features, such as interchangeable lenses, coupled range-finders, 250 exposures. By the time of his sudden death in 1936, Barnack's life's work had forever transformed the nature of photography.[br]Further ReadingJ.Borgé and G.Borgé, 1977, Prestige de la, photographie.BC -
42 Wallis, Sir Barnes Neville
[br]b. 26 September 1887 Ripley, Derbyshire, Englandd. 30 October 1979 Leatherhead, Surrey, England[br]English aeronautical designer and inventor.[br]Wallis was apprenticed first at Thames Engineering Works, and then, in 1908, at John Samuel White's shipyard at Cowes. In 1913, the Government, spurred on by the accelerating development of the German Zeppelins (see Zeppelin, Ferdinand von), ordered an airship from Vickers; Wallis was invited to join the design team. Thus began his long association with aeronautical design and with Vickers. This airship, and the R80 that followed it, were successfully completed, but the military lost interest in them.In 1924 the Government initiated a programme for the construction of two airships to settle once and for all their viability for long-dis-tance air travel. The R101 was designed by a Government-sponsored team, but the R100 was designed by Wallis working for a subsidiary of Vickers. The R100 took off on 29 July 1930 for a successful round trip to Canada, but the R101 crashed on its first flight on 4 October, killing many of its distinguished passengers. The shock of this disaster brought airship development in Britain to an abrupt end and forced Wallis to direct his attention to aircraft.In aircraft design, Wallis is known for his use of geodesic construction, which combined lightness with strength. It was applied first to the single-engined "Wellesley" and then the twin-en-gined "Wellington" bomber, which first flew in 1936. With successive modifications, it became the workhorse of RAF Bomber Command during the Second World War until the autumn of 1943, when it was replaced by four-engined machines. In other areas, it remained in service until the end of the war and, in all, no fewer than 11,461 were built.Wallis is best known for his work on bomb design, first the bouncing bomb that was used to breach the Möhne and Eder dams in the Ruhr district of Germany in 1943, an exploit immortalized in the film Dambusters. Encouraged by this success, the authorities then allowed Wallis to realize an idea he had long urged, that of heavy, penetration bombs. In the closing stages of the war, Tallboy, of 12,000 lb (5,400 kg), and the 10-ton Grand Slam were used to devastating effect.After the Second World War, Wallis returned to aeronautical design and was given his own department at Vickers to promote his ideas, principally on variable-geometry or swing-wing aircraft. Over the next thirteen years he battled towards the prototype stage of this revolutionary concept. That never came, however; changing conditions and requirements and increasing costs led to the abandonment of the project. Bit-terly disappointed, Wallis continued his researches into high-speed aircraft until his retirement from Vickers (by then the British Aircraft Corporation), in 1971.[br]Principal Honours and DistinctionsKnighted 1968. FRS 1945.Further ReadingJ.Morpurgo, 1972, Barnes Wallis: A Biography, London: Longman (a readable account, rather biased in Wallis's favour).C.J.Heap, 1987, The Papers of Sir Barnes Wallis (1887–1979) in the Science Museum Library, London: Science Museum; with a biographical introd. by L.R.Day.LRDBiographical history of technology > Wallis, Sir Barnes Neville
-
43 VC
- центр видеоконференцсвязи
- режим компрессии голосового сигнала
- регулирование объёма
- регулирование напряжения
- переменные затраты (издержки)
- компенсатор напряжения
- выбивание гидрозатвора
- виртуальный контейнер
- виртуальный канал ATM
- виртуальный канал
- виртуальное устройство
- виртуальное соединение
- виртуальная линия
- вакуумный контактор (пускатель)
вакуумный контактор (пускатель)
Контактор (пускатель), у которого главные контакты размыкаются и замыкаются внутри оболочки с сильно разреженной атмосферой.
[ ГОСТ Р 50030.4.1-2002 (МЭК 60947-4-1-2000)]EN
vacuum contactor (or starter)
contactor (or starter) in which the main contacts open and close within a highly evacuated envelope
[IEC 60947-4-1, ed. 3.0 (2009-09)]FR
contacteur (ou démarreur) sous vide
contacteur (ou démarreur) dont les contacts principaux s'ouvrent et se ferment à l'intérieur d'une enveloppe à basse pression
[IEC 60947-4-1, ed. 3.0 (2009-09)]Параллельные тексты EN-RU
Vacuum contactors are mainly used for the switching of motors, transformers, capacitors in AC power lines.
They can be installed in multi-stack cubicles.
A vacuum contactor comprises several assemblies such as switching mechanism including vacuum interrupters, magnetic actuator, high strength molded front cover and auxiliary devices.
Actuating is available either at instantaneous or continuous excitation.
[LS Industrial Systems]Вакуумные контакторы предназначены в основном для коммутации силовых цепей переменного тока электродвигателей, трансформаторов и конденсаторов.
Контакторы пригодны для установки в комплектные устройства в несколько ярусов.
Вакуумный контактор состоит из следующих узлов: коммутационный механизм с вакуумной дугогасительной камерой, электромагнитный привод, прочная пластмассовая передняя панель и вспомогательные устройства.
Включение и отключение контактора возможно как подачей кратковременного, так и непрерывного сигнала на электромагнитный привод.
[Перевод Интент]
Вакуумный контактор среднего напряжения выдвижного исполнения с предохранителями
Рис. LS Industrial Systems1
Передняя панель
2
Окно проверки состояния предохранителя
3
Электрический соединитель
4
Unlock button (Interlock lever)
Кнопка разблокировки рычага
5
Ручка (предназначена для того, чтобы вдвигать и выдвигать контактор)
6
ON/OFF indicator
Указатель коммутационного положения контактора (ВКЛ/ОТКЛ.)
7
Счетчик операционных циклов
8
Кнопка ручного отключения контактора
10
Выдвижной лоток
11
Блокировочный рычаг
12
Блокировочная кнопка
13
Hole for Interlock lever insertion
Отверстие для вставки блокировочного рычага
14
Test/Run indicator
Индикатор положений Испытательное/Присоединенное
15
Корзина
16
Конденсаторный источник питания
17
Кожух предохранителя
Тематики
- аппарат, изделие, устройство...
- высоковольтный аппарат, оборудование...
- контакторы и пускатели
EN
FR
виртуальная линия
виртуальный канал
(МСЭ-Т Y.1314).
[ http://www.iks-media.ru/glossary/index.html?glossid=2400324]Тематики
- электросвязь, основные понятия
Синонимы
EN
- virtual circuit/channel
- VC
виртуальное соединение
Услуга служб виртуальных каналов с коммутацией пакетов, в которой процедура установления соединения и процедура отбоя вызова будут определять период связи между двумя устройствами ООД, в течение которого данные пользователя будут переданы в сеть при работе в пакетном режиме. (МСЭ-Т Х.7).
[ http://www.iks-media.ru/glossary/index.html?glossid=2400324]Тематики
- электросвязь, основные понятия
EN
виртуальное устройство
виртуальное соединение
Сетевой сервис, обеспечивающий ориентированное на соединения обслуживание в зависимости от нижележащих сетевых уровней. См. также connection-oriented. Виртуальное устройство работает подобно соединению "точка-точка" или другой системе, обеспечивающей последовательную передачу пакетов.
[ http://www.lexikon.ru/dict/net/index.html]Тематики
Синонимы
EN
виртуальный канал
Коммуникационный канал, обеспечивающий последовательный однонаправленный перенос ячеек ATM. Соединение через UNI или NNI, обеспечивающее коммутацию различных ячеек ATM в виртуальный путь для разных получателей.
[ http://www.lexikon.ru/dict/net/index.html]Тематики
EN
виртуальный канал ATM
(МСЭ-Т Н.245)
[ http://www.iks-media.ru/glossary/index.html?glossid=2400324]Тематики
- электросвязь, основные понятия
EN
виртуальный контейнер
ВК представляет собой информационную структуру, используемую для обеспечения соединения трактов различных уровней в СЦИ. (МСЭ-R F.750-4).
[ http://www.iks-media.ru/glossary/index.html?glossid=2400324]Тематики
- электросвязь, основные понятия
EN
переменные затраты (издержки)
Издержки, величина которых меняется в зависимости от изменения объема производства: затраты на сырье, топливо, энергию, заработную плату и т.д.
[ http://slovar-lopatnikov.ru/]Тематики
EN
регулирование напряжения
—
[Я.Н.Лугинский, М.С.Фези-Жилинская, Ю.С.Кабиров. Англо-русский словарь по электротехнике и электроэнергетике, Москва, 1999 г.]Тематики
- электротехника, основные понятия
EN
режим компрессии голосового сигнала
(МСЭ-Т Y.1454).
[ http://www.iks-media.ru/glossary/index.html?glossid=2400324]Тематики
- электросвязь, основные понятия
EN
центр видеоконференцсвязи
—
[Л.Г.Суменко. Англо-русский словарь по информационным технологиям. М.: ГП ЦНИИС, 2003.]Тематики
EN
Англо-русский словарь нормативно-технической терминологии > VC
См. также в других словарях:
Strength reduction — is a compiler optimization where a costly operation is replaced with an equivalent, but less expensive operation.Operator strength reduction involves using mathematical identities to replace slow math operations with faster operations. Examples… … Wikipedia
Variable Geo — This article refers to the video game series, for the OVAs, see Variable Geo (anime). Variable Geo Front cover of V.G.: Variable Geo for the PC 9801, the first title of the series. Developer(s) Gig … Wikipedia
Strength training — This article is about the basic principles to train muscular strength. For strength training using free weights or weight machines, see weight training. The lat. pulldown, which strengthens the arms and back Strength training is the use of… … Wikipedia
Instrumental variable — In statistics, econometrics, and related disciplines, the method of instrumental variables (IV) is used to estimate causal relationships when controlled experiments are not feasible. Statistically, IV methods allow consistent estimation when the… … Wikipedia
Induction variable — In computer science, an induction variable is a variable that gets increased or decreased by a fixed amount on every iteration of a loop, or is a linear function of another induction variable.For example, in the following loop, i and j are… … Wikipedia
Random variable — A random variable is a rigorously defined mathematical entity used mainly to describe chance and probability in a mathematical way. The structure of random variables was developed and formalized to simplify the analysis of games of chance,… … Wikipedia
Moderator variable — A moderator variable is, in general terms, a qualitative (e.g., sex, race, class) or quantitative (e.g., level of reward) variable that affects the direction and/or strength of the relation between dependent and independent variables.… … Wikipedia
The Strength of Nations — is a 3 player world domination shareware DOS game created in 1988 by Israel del Rio [http://www.israeldelrio.com Israel del Rio] . The setting is January 1, 2019, in the aftermath of a nuclear holocaust. About 6,000 million square miles (about… … Wikipedia
Polar (cataclysmic variable) — A Polar (also AM Herculis Star) is a type of cataclysmic variable binary star system with a very strong magnetic field. In most cataclysmic variables, matter from a main sequence companion star is gravitationally stripped by a white dwarf star in … Wikipedia
helium variable — noun A star in which the strength of the helium absorption lines vary periodically; at times appearing to be a helium star … Wiktionary
Betrayal at Krondor — Infobox VG| title = Betrayal at Krondor developer = Dynamix publisher = Sierra On Line designer = Neal Hallford, John Cutter released = June 22,1993 genre = Role playing game modes = Single Player ratings = USK: unrestricted platforms = MS DOS… … Wikipedia
