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61 F70.0
рус С указанием на отсутствие или слабую выраженность нарушения поведенияeng Mild mental retardation. Approximate IQ range of 50 to 69 (in adults, mental age from 9 to under 12 years). Likely to result in some learning difficulties in school. Many adults will be able to work and maintain good social relationships and contribute to society. (Includes: ) feeble-mindedness, mild mental subnormality. With the statement of no, or minimal, impairment of behaviour -
62 F70.1
рус Значительное нарушение поведения, требующее ухода и леченияeng Mild mental retardation. Approximate IQ range of 50 to 69 (in adults, mental age from 9 to under 12 years). Likely to result in some learning difficulties in school. Many adults will be able to work and maintain good social relationships and contribute to society. (Includes: ) feeble-mindedness, mild mental subnormality. Significant impairment of behaviour requiring attention or treatment -
63 F70.8
рус Другие нарушения поведенияeng Mild mental retardation. Approximate IQ range of 50 to 69 (in adults, mental age from 9 to under 12 years). Likely to result in some learning difficulties in school. Many adults will be able to work and maintain good social relationships and contribute to society. (Includes: ) feeble-mindedness, mild mental subnormality. Other impairments of behaviour -
64 F70.9
рус Без указаний на нарушение поведенияeng Mild mental retardation. Approximate IQ range of 50 to 69 (in adults, mental age from 9 to under 12 years). Likely to result in some learning difficulties in school. Many adults will be able to work and maintain good social relationships and contribute to society. (Includes: ) feeble-mindedness, mild mental subnormality. Without mention of impairment of behaviour -
65 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 -
66 Reichenbach, Georg Friedrich von
SUBJECT AREA: Mechanical, pneumatic and hydraulic engineering, Photography, film and optics, Public utilities[br]b. 24 August 1772 Durlach, Baden, Germanyd. 21 May 1826 Munich, Germany[br]German engineer.[br]While he was attending the Military School at Mannheim, Reichenbach drew attention to himself due to the mathematical instruments that he had designed. On the recommendation of Count Rumford in Munich, the Bavarian government financed a two-year stay in Britain so that Reichenbach could become acquainted with modern mechanical engineering. He returned to Mannheim in 1793, and during the Napoleonic Wars he was involved in the manufacture of arms. In Munich, where he was in the service of the Bavarian state from 1796, he started producing precision instruments in his own time. His basic invention was the design of a dividing machine for circles, produced at the end of the eighteenth century. The astronomic and geodetic instruments he produced excelled all the others for their precision. His telescopes in particular, being perfect in use and of solid construction, soon brought him an international reputation. They were manufactured at the MathematicMechanical Institute, which he had jointly founded with Joseph Utzschneider and Joseph Liebherr in 1804 and which became a renowned training establishment. The glasses and lenses were produced by Joseph Fraunhofer who joined the company in 1807.In the same year he was put in charge of the technical reorganization of the salt-works at Reichenhall. After he had finished the brine-transport line from Reichenhall to Traunstein in 1810, he started on the one from Berchtesgaden to Reichenhall which was an extremely difficult task because of the mountainous area that had to be crossed. As water was the only source of energy available he decided to use water-column engines for pumping the brine in the pipes of both lines. Such devices had been in use for pumping purposes in different mining areas since the middle of the eighteenth century. Reichenbach knew about the one constructed by Joseph Karl Hell in Slovakia, which in principle had just been a simple piston-pump driven by water which did not work satisfactorily. Instead he constructed a really effective double-action water-column engine; this was a short time after Richard Trevithick had constructed a similar machine in England. For the second line he improved the system and built a single-action pump. All the parts of it were made of metal, which made them easy to produce, and the pumps proved to be extremely reliable, working for over 100 years.At the official opening of the line in 1817 the Bavarian king rewarded him generously. He remained in the state's service, becoming head of the department for roads and waterways in 1820, and he contributed to the development of Bavarian industry as well as the public infrastructure in many ways as a result of his mechanical skill and his innovative engineering mind.[br]Further ReadingBauernfeind, "Georg von Reichenbach" Allgemeine deutsche Biographie 27:656–67 (a reliable nineteenth-century account).W.Dyck, 1912, Georg v. Reichenbach, Munich.K.Matschoss, 1941, Grosse Ingenieure, Munich and Berlin, 3rd edn. 121–32 (a concise description of his achievements in the development of optical instruments and engineering).WKBiographical history of technology > Reichenbach, Georg Friedrich von
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