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1 comparative experiment
Большой англо-русский и русско-английский словарь > comparative experiment
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2 comparative experiment
Математика: сравнительный экспериментУниверсальный англо-русский словарь > comparative experiment
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3 comparative experiment
English-Russian dictionary on experimental design > comparative experiment
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4 comparative experiment
English-Russian scientific dictionary > comparative experiment
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5 comparative experiment
Англо-русский словарь по исследованиям и ноу-хау > comparative experiment
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6 experiment
1) опыт || производить опыты2) эксперимент || экспериментировать• -
7 comparative
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8 сравнительный эксперимент
Большой англо-русский и русско-английский словарь > сравнительный эксперимент
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9 test
1) замер2) испытание; испытания || испытывать; исследовать3) стат. критерий4) обнаружение; определение5) опробывание6) опыт; эксперимент7) признак8) проба || пробовать9) проверка || проверять10) тест || тестовый11) пробный•test for uniformity — мат. критерий равномерности
test for trend — мат. проверка на тренд
test for singularity — мат. критерий особенности
test for regression — мат. проверка на наличие регрессии
test for randomness — мат. критерий случайности
test for primality — мат. признак простоты (числа)
test for optimality — мат. критерий оптимальности
test for nonadditivity — мат. признак неаддитивности
test for minimum — мат. проверка на минимум
test for interaction — мат. критерий взаимодействия
test for exponentiality — мат. критерий экспоненциальности
test for ergodicity — мат. критерий эргодичности
test for divisibility — мат. признак делимости
test for definiteness — мат. критерий определённости
test for convergence — мат. критерий сходимости
test for concordance — мат. критерий согласия
test for casualty — мат. критерий обусловленности
- asymptotically efficient test - asymptotically minimax test - asymptotically most powerful rank test - asymptotically optimum test - asymptotically robust test - asymptotically unbiased test - double-tailed testto make test — стат. строить критерий (напр., для проверки значимости отклонений)
- fat test- general test for homogeneity- jet test- locally unbiased test - multiple comparison test - multiple ranking test - normal scores test - one-tailed test - probability ratio test - process normality test - single-tailed test - statistically valid test - test for goodness of fit - test for homogeneity of means - test for homogeneity of variances - test for nonsphericalness of disturbances - test for significant changes - test for uniform convergence - test hypothesis with experiment - uniformly asymptotically efficient test - uniformly best test - uniformly consistent test -
10 Brunel, Isambard Kingdom
SUBJECT AREA: Civil engineering, Land transport, Mechanical, pneumatic and hydraulic engineering, Ports and shipping, Public utilities, Railways and locomotives[br]b. 9 April 1806 Portsea, Hampshire, Englandd. 15 September 1859 18 Duke Street, St James's, London, England[br]English civil and mechanical engineer.[br]The son of Marc Isambard Brunel and Sophia Kingdom, he was educated at a private boarding-school in Hove. At the age of 14 he went to the College of Caen and then to the Lycée Henri-Quatre in Paris, after which he was apprenticed to Louis Breguet. In 1822 he returned from France and started working in his father's office, while spending much of his time at the works of Maudslay, Sons \& Field.From 1825 to 1828 he worked under his father on the construction of the latter's Thames Tunnel, occupying the position of Engineer-in-Charge, exhibiting great courage and presence of mind in the emergencies which occurred not infrequently. These culminated in January 1828 in the flooding of the tunnel and work was suspended for seven years. For the next five years the young engineer made abortive attempts to find a suitable outlet for his talents, but to little avail. Eventually, in 1831, his design for a suspension bridge over the River Avon at Clifton Gorge was accepted and he was appointed Engineer. (The bridge was eventually finished five years after Brunel's death, as a memorial to him, the delay being due to inadequate financing.) He next planned and supervised improvements to the Bristol docks. In March 1833 he was appointed Engineer of the Bristol Railway, later called the Great Western Railway. He immediately started to survey the route between London and Bristol that was completed by late August that year. On 5 July 1836 he married Mary Horsley and settled into 18 Duke Street, Westminster, London, where he also had his office. Work on the Bristol Railway started in 1836. The foundation stone of the Clifton Suspension Bridge was laid the same year. Whereas George Stephenson had based his standard railway gauge as 4 ft 8½ in (1.44 m), that or a similar gauge being usual for colliery wagonways in the Newcastle area, Brunel adopted the broader gauge of 7 ft (2.13 m). The first stretch of the line, from Paddington to Maidenhead, was opened to traffic on 4 June 1838, and the whole line from London to Bristol was opened in June 1841. The continuation of the line through to Exeter was completed and opened on 1 May 1844. The normal time for the 194-mile (312 km) run from Paddington to Exeter was 5 hours, at an average speed of 38.8 mph (62.4 km/h) including stops. The Great Western line included the Box Tunnel, the longest tunnel to that date at nearly two miles (3.2 km).Brunel was the engineer of most of the railways in the West Country, in South Wales and much of Southern Ireland. As railway networks developed, the frequent break of gauge became more of a problem and on 9 July 1845 a Royal Commission was appointed to look into it. In spite of comparative tests, run between Paddington-Didcot and Darlington-York, which showed in favour of Brunel's arrangement, the enquiry ruled in favour of the narrow gauge, 274 miles (441 km) of the former having been built against 1,901 miles (3,059 km) of the latter to that date. The Gauge Act of 1846 forbade the building of any further railways in Britain to any gauge other than 4 ft 8 1/2 in (1.44 m).The existence of long and severe gradients on the South Devon Railway led to Brunel's adoption of the atmospheric railway developed by Samuel Clegg and later by the Samuda brothers. In this a pipe of 9 in. (23 cm) or more in diameter was laid between the rails, along the top of which ran a continuous hinged flap of leather backed with iron. At intervals of about 3 miles (4.8 km) were pumping stations to exhaust the pipe. Much trouble was experienced with the flap valve and its lubrication—freezing of the leather in winter, the lubricant being sucked into the pipe or eaten by rats at other times—and the experiment was abandoned at considerable cost.Brunel is to be remembered for his two great West Country tubular bridges, the Chepstow and the Tamar Bridge at Saltash, with the latter opened in May 1859, having two main spans of 465 ft (142 m) and a central pier extending 80 ft (24 m) below high water mark and allowing 100 ft (30 m) of headroom above the same. His timber viaducts throughout Devon and Cornwall became a feature of the landscape. The line was extended ultimately to Penzance.As early as 1835 Brunel had the idea of extending the line westwards across the Atlantic from Bristol to New York by means of a steamship. In 1836 building commenced and the hull left Bristol in July 1837 for fitting out at Wapping. On 31 March 1838 the ship left again for Bristol but the boiler lagging caught fire and Brunel was injured in the subsequent confusion. On 8 April the ship set sail for New York (under steam), its rival, the 703-ton Sirius, having left four days earlier. The 1,340-ton Great Western arrived only a few hours after the Sirius. The hull was of wood, and was copper-sheathed. In 1838 Brunel planned a larger ship, some 3,000 tons, the Great Britain, which was to have an iron hull.The Great Britain was screwdriven and was launched on 19 July 1843,289 ft (88 m) long by 51 ft (15.5 m) at its widest. The ship's first voyage, from Liverpool to New York, began on 26 August 1845. In 1846 it ran aground in Dundrum Bay, County Down, and was later sold for use on the Australian run, on which it sailed no fewer than thirty-two times in twenty-three years, also serving as a troop-ship in the Crimean War. During this war, Brunel designed a 1,000-bed hospital which was shipped out to Renkioi ready for assembly and complete with shower-baths and vapour-baths with printed instructions on how to use them, beds and bedding and water closets with a supply of toilet paper! Brunel's last, largest and most extravagantly conceived ship was the Great Leviathan, eventually named The Great Eastern, which had a double-skinned iron hull, together with both paddles and screw propeller. Brunel designed the ship to carry sufficient coal for the round trip to Australia without refuelling, thus saving the need for and the cost of bunkering, as there were then few bunkering ports throughout the world. The ship's construction was started by John Scott Russell in his yard at Millwall on the Thames, but the building was completed by Brunel due to Russell's bankruptcy in 1856. The hull of the huge vessel was laid down so as to be launched sideways into the river and then to be floated on the tide. Brunel's plan for hydraulic launching gear had been turned down by the directors on the grounds of cost, an economy that proved false in the event. The sideways launch with over 4,000 tons of hydraulic power together with steam winches and floating tugs on the river took over two months, from 3 November 1857 until 13 January 1858. The ship was 680 ft (207 m) long, 83 ft (25 m) beam and 58 ft (18 m) deep; the screw was 24 ft (7.3 m) in diameter and paddles 60 ft (18.3 m) in diameter. Its displacement was 32,000 tons (32,500 tonnes).The strain of overwork and the huge responsibilities that lay on Brunel began to tell. He was diagnosed as suffering from Bright's disease, or nephritis, and spent the winter travelling in the Mediterranean and Egypt, returning to England in May 1859. On 5 September he suffered a stroke which left him partially paralysed, and he died ten days later at his Duke Street home.[br]Further ReadingL.T.C.Rolt, 1957, Isambard Kingdom Brunel, London: Longmans Green. J.Dugan, 1953, The Great Iron Ship, Hamish Hamilton.IMcNBiographical history of technology > Brunel, Isambard Kingdom
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11 Hunter, John
SUBJECT AREA: Medical technology[br]b. 14 (registered 13) February 1728 East Kilbride, Lanarkshire, Scotlandd. 16 October 1793 London, England[br]Scottish surgeon and anatomist, pioneer of experimental methods in medicine and surgery.[br]The younger brother of William Hunter (1718–83), who was of great distinction but perhaps of slightly less achievement in similar fields, he owed much of his early experience to his brother; William, after a period at Glasgow University, moved to St George's Hospital, London. In his later teens, John assisted a brother-in-law with cabinet-making. This appears to have contributed to the lifelong mechanical skill which he displayed as a dissector and surgeon. This skill was particularly obvious when, after following William to London in 1748, he held post at a number of London teaching hospitals before moving to St George's in 1756. A short sojourn at Oxford in 1755 appears to have been unfruitful.Despite his deepening involvement in the study of comparative anatomy, facilitated by the purchase of animals from the Tower menagerie and travelling show people, he accepted an appointment as a staff surgeon in the Army in 1760, participating in the expedition to Belle Isle and also serving in Portugal. He returned home with over 300 specimens in 1763 and, until his appointment as Surgeon to St George's in 1768, was heavily involved in the examination of this and other material, as well as in studies of foetal testicular descent, placental circulation, the nature of pus and lymphatic circulation. In 1772 he commenced lecturing on the theory and practice of surgery, and in 1776 he was appointed Surgeon-Extraordinary to George III.He is rightly regarded as the founder of scientific surgery, but his knowledge was derived almost entirely from his own experiments and observations. His contemporaries did not always accept or understand the concepts which led to such aphorisms as, "to perform an operation is to mutilate a patient we cannot cure", and his written comment to his pupil Jenner: "Why think. Why not trie the experiment". His desire to establish the aetiology of gonorrhoea led to him infecting himself, as a result of which he also contracted syphilis. His ensuing account of the characteristics of the disease remains a classic of medicine, although it is likely that the sequelae of the condition brought about his death at a relatively early age. From 1773 he suffered recurrent anginal attacks of such a character that his life "was in the hands of any rascal who chose to annoy and tease him". Indeed, it was following a contradiction at a board meeting at St George's that he died.By 1788, with the death of Percival Pott, he had become unquestionably the leading surgeon in Britain, if not Europe. Elected to the Royal Society in 1767, the extraordinary variety of his collections, investigations and publications, as well as works such as the "Treatise on the natural history of the human teeth" (1771–8), gives testimony to his original approach involving the fundamental and inescapable relation of structure and function in both normal and disease states. The massive growth of his collections led to his acquiring two houses in Golden Square to contain them. It was his desire that after his death his collection be purchased and preserved for the nation. It contained 13,600 specimens and had cost him £70,000. After considerable delay, Par-liament voted inadequate sums for this purpose and the collection was entrusted to the recently rechartered Royal College of Surgeons of England, in whose premises this remarkable monument to the omnivorous and eclectic activities of this outstanding figure in the evolution of medicine and surgery may still be seen. Sadly, some of the collection was lost to bombing during the Second World War. His surviving papers were also extensive, but it is probable that many were destroyed in the early nineteenth century.[br]Principal Honours and DistinctionsFRS 1767. Copley Medal 1787.Bibliography1835–7, Works, ed. J.F.Palmer, Philosophical Transactions of the Royal Society, London.MG -
12 Ohm, Georg Simon
SUBJECT AREA: Electricity[br]b. 16 March 1789 Erlangen, near Nuremberg, Germanyd. 6 July 1854 Munich, Germany[br]German physicist who laid the foundations of electrical science with his discovery of Ohm's Law.[br]Given the same first name as his father, Johann, at his baptism, Ohm was generally known by the name of Georg to avoid confusion. While still a child he became interested in science and learned many of his basic skills from his father, a mechanical engineer. After basic education he attended the Gymnasium at Erlangen for a year, then in 1805 he entered the University of Erlangen. Probably for financial reasons, he left after three terms in 1806 and obtained a post as a mathematics tutor at a school in Gottstadt, Switzerland, where he may well have begun to experiment with electrical circuits. In 1811 he returned to Erlangen. He appears to have obtained his doctorate in the same year. After studying physics for a year, he became a tutor at the Studienanstalt (girls' secondary school) at Bamberg in Bavaria. There, in 1817, he wrote a book on the teaching of geometry in schools, as a result of which King Freidrich Wilhelm III of Prussia had him appointed Oberlehrer (Senior Master) in Mathematics and Physics at the Royal Consistory in Cologne. He continued his electrical experiments and in 1826 was given a year's leave of absence to concentrate on this work, which culminated the following year in publication of his "Die galvanische Kette", in which he demonstrated his now-famous Law, that the current in a resistor is proportional to the applied voltage and inversely proportional to the resistance. Because he published only a theoretical treatment of his Law, without including the supporting experimental evidence, his conclusions were widely ignored and ridiculed by the eminent German scientists of his day; bitterly disappointed, he was forced to resign his post at the Consistory. Reduced to comparative poverty he took a position as a mathematics teacher at the Berlin Military School. Fortunately, news of his discovery became more widely known, and in 1833 he was appointed Professor at the Nuremberg Polytechnic School. Two years later he was given the Chair of Higher Mathematics at the University of Erlangen and the position of State Inspector of Scientific Education. Honoured by the Royal Society of London in 1841 and 1842, in 1849 he became Professor of Physics at Munich University, apost he held until his death.[br]Principal Honours and DistinctionsRoyal Society Copley Medal 1841. FRS 1842.Bibliography1817, "Grundlinien zu einer zweckmàssigen Behandlung der Geometric als hohern Bildungsmittels an vorbereitenden Lehranstalt".1827, "Die galvanische Kette, mathematische bearbeit".Further ReadingF.E.Terman, 1943, Radio Engineers' Handbook, New York: McGraw-Hill, Section 3 (for circuit theory based on Ohm's Law).See also: Thévénin, Léon CharlesKF
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