Copenhagen%20(Denmark)

Copenhagen, Dinamarca.

геогр. (Denmark) Копенгаген (Дания)

Религия: Люций I

SUBJECT AREA: Electricity

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After passing a legal examination, Hjorth found employment in the state treasury in Copenhagen and in 1830 advanced to be Clerk of the Exchequer and Secretary. In 1834 he visited England to study the use of steam road and rail vehicles. Hjorth was involved in the formation of the first railway company in Denmark and became Technical Director of Denmark's first railway, a line between Copenhagen and Roskilde that opened in 1847. In 1848 he petitioned the Government for funds to visit England and have built there an electric motor of his own design with oscillating motion. This petition, supported by Hans Christian Oersted (1777–1851), was granted. A British patent was obtained for the machine, an example being exhibited at the 1851 Great Exhibition in London. Turning his attention to the generation of electricity, he conceived as early as May 1851 the dynamo electric principle with self-excitation that was incorporated in his patent in 1855. Unfortunately, Hjorth held the firm but mistaken belief that if he could use his dynamo to drive a motor he would obtain more power than was consumed in driving the dynamo. The theory of conservation of energy was being only slowly accepted at that time, and Hjorth, with little scientific training, was to be disappointed at the failure of his schemes. He worked with great perseverance and industry to the end of his life on the design of his electrical machines.

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SUBJECT AREA: Broadcasting, Electronics and information technology, Recording, Telecommunications

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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.

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SUBJECT AREA: Aerospace

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Flying kites as a boy aroused Ellehammer's interest in aeronautics, and he developed a kite that could lift him off the ground. After completing an apprenticeship, he started his own manufacturing business, whose products included motor cycles. He experimented with model aircraft as a sideline and used his mo tor-cycle experience to build an aero engine during 1903–4. It had three cylinders radiating from the crankshaft, making it, in all probability, the world's first air-cooled radial engine. Ellehammer built his first full-size aircraft in 1905 and tested it in January 1906. It ran round a circular track, was tethered to a central mast and was unmanned. A more powerful engine was needed, and by September Ellehammer had improved his engine so that it was capable of lifting him for a tethered flight. In 1907 Ellehammer produced a new five-cylinder radial engine and installed it in the first manned tri-plane, which made a number of free-flight hops. Various wing designs were tested and during 1908–9 Ellehammer developed yet another radial engine, which had six cylinders arranged in two rows of three. Ellehammer's engines had a very good power-to-weight ratio, but his aircraft designs lacked an understanding of control; consequently, he never progressed beyond short hops in a straight line. In 1912 he built a helicopter with contra-rotating rotors that was a limited success. Ellehammer turned his attention to his other interests, but if he had concentrated on his excellent engines he might have become a major aero engine manufacturer.

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SUBJECT AREA: Medical technology

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Following his early education in Reykjavik, Finsen moved to Copenhagen and obtained his medical degree in 1891. Appointed as a demonstrator in anatomy at the University of Copenhagen, he soon abandoned a career in academic medicine, preferring the sunlit environment of outdoor life. He was soon studying the nature of light-induced inflammation and proceeded to identify the radiation in the blue-violet and ultraviolet (actinic) parts of the solar spectrum as being particularly responsible. By 1893 he had discovered the beneficial effect of red light on the lesions of smallpox and in 1894 he put forward his conclusion that light possessed a direct therapeutic quality. In 1895 he amplified this work with the treatment of lupus vulgaris (tuberculosis of the skin) using a carbon-arc source suitably filtered to expose the tissues to high concentrations of ultraviolet rays. Extensions of this form of therapy were applied in a number of other conditions until superseded by the development of serology, chemotherapy and antibiotic drugs.

In his final years, afflicted with a cardiac condition possibly related to the endemic hydatid disease of Iceland, he carried out an important self-study on salt and water metabolism, laying the foundations for the therapeutic concept of low fluid and low salt intake therapy.

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SUBJECT AREA: Architecture and building

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Of Scandinavian parentage, Arup attended school in Germany and Denmark before taking his degree in mathematics and philosophy at Copenhagen University in 1914. He then graduated as a civil engineer from the Royal Technical College in the same city, specializing in the theory of structures.

Arup retained close ties with Europe for some time, working in Hamburg as a designer for the Danish civil engineering firm of Christiani \& Nielsen. Then, in the 1930s, he began what was to be a long career in England as an engineering consultant to a number of architects who were beginning to build with modern materials (par-ticularly concrete) and methods of construction. He became consultant to the famous firm of Tecton (under the direction of Berthold Lubetkin) and was closely associated with the leading projects of that firm at the time, notably the High-point flats at Highgate, the Finsbury Health Centre and the award-winning Penguin Pool at the Regent's Park Zoological Gardens, all in London.

In 1945 Arup founded his own firm, Ove Arup \& Partners, working entirely as a consultant to architects, particularly on structural schemes, and in 1963 he set up a partnership of architects and engineers, Arup Associates. The many and varied projects with which he was concerned included Coventry Cathedral and the University of Sussex with Sir Basil Spence, the Sydney Opera House with Joern Utzon and St Catherine's College, Oxford, with Arne Jacobsen.

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1) Грубое выражение: Cutie Pie Husband

2) Оптика: computer polarization holography

3) Вычислительная техника: Cost Per Hour

4) Имена и фамилии: Chapman Preston Hastie

5) Фармация: capsules per hour

6) Правительство: County Parish Holding

7) Аэропорты: Copenhagen, Denmark

8) Единицы измерений: Corpses Per Hour

9) AMEX. Capital Pacific Holdings, Inc.

1) Общая лексика: Лусиус, Люций, Люшес

2) История: Луций

3) Религия: (Pope from 1144 to 1145. He was elected to succeed Celestine II on March 12, 1144) Люций II, (Pope from 1181 to 1185. His synod activated the strict decrees of the third Lateran Council; founded the medieval Inquisition; and instigated the church's attack against the Cathari) Луций III, (Pope from June 253 to March 254. He is honoured in Denmark as the patron saint of Copenhagen) Люций I, (a common Roman forename, сокр. L.) Луций

4) Макаров: Лусиус (мужское имя), Люций (мужское имя), Люшес (мужское имя)

5) Христианство: Лукий (апостол из 70)

1) Автомобильный термин: remote keyless entry

2) Физика: Rotational Kinetic Energy

3) Правительство: Roanoke, Virginia

4) Аэропорты: Roskilde, Copenhagen, Denmark

5) AMEX. Cap Rock Energy Corporation

1) Грубое выражение: Cutie Pie Husband

2) Оптика: computer polarization holography

3) Вычислительная техника: Cost Per Hour

4) Имена и фамилии: Chapman Preston Hastie

5) Фармация: capsules per hour

6) Правительство: County Parish Holding

7) Аэропорты: Copenhagen, Denmark

8) Единицы измерений: Corpses Per Hour

9) AMEX. Capital Pacific Holdings, Inc.

SUBJECT AREA: Ports and shipping, Steam and internal combustion engines

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Pounder served an apprenticeship with Richardsons Westgarth, marine engineers in north east England. Shortly after, he moved to Harland \& Wolff of Belfast and there fulfilled his life's work. He rose to the rank of Director but is remembered for his outstanding leadership in producing the most advanced steam and diesel machinery installations of their time. Harland \& Wolff were the main licensees for the Burmeister \& Wain marine diesel system, and the Copenhagen company made most of the decisions on design; however, Pounder often found himself in the hot seat and once had the responsibility of concurring with the shipyard's decision to build three Atlantic liners with the largest diesel engines in the world, well beyond the accepted safe levels of extrapolation. With this, Belfast secured worldwide recognition as builders of diesel-driven liners. During the German occupation of Denmark (1940–5), the engineering department at Belfast worked on its own and through systematic research and experimentation built up a database of information that was invaluable in the postwar years.

Pounder was instrumental in the development of airless injection diesel fuel pumps. He was a stalwart supporter of all research and development, and while at Belfast was involved in the building of twelve hundred power units. While in his twenties, Pounder began a literary career which continued for sixty years. The bulk of his books and papers were on engineering and arguably the best known is his work on marine diesel engines, which ran to many editions. He was Chairman of Pametrada, the marine engineering research council of Great Britain, and later of the machinery committee of the British Ship Research Association. He regarded good relations within the industry as a matter of paramount importance.

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