NIST leads creation of two new IEC superconductivity standards. (General Developments).Two new intemational standards on superconductivity superconductivity, abnormally high electrical conductivity of certain substances. The phenomenon was discovered in 1911 by Kamerlingh Onnes, who found that the resistance of mercury dropped suddenly to zero at a temperature of about 4.2°K;. were recently published by the International Electro-technical Commission (IEC (International Electrotechnical Commission, Geneva, Switzerland, www.iec.ch) An organization that sets international electrical and electronics standards founded in 1906. It is made up of national committees from over 60 countries. IEC - International Electrotechnical Commission ) Technical Committee 90 (TC 90). The documents are: * IEC 61788-4 Superconductivity--Part 4: Residual resistance ratio measurement--Residual resistance ratio of Nb-Ti composite superconductors; * IEC 61788-7 Superconductivity--Part 7: Electronic characteristic measurements--Surface resistance of superconductors at microwave frequencies. Two NIST (National Institute of Standards & Technology, Washington, DC, www.nist.gov) The standards-defining agency of the U.S. government, formerly the National Bureau of Standards. It is one of three agencies that fall under the Technology Administration (www.technology. scientists at Boulder Boulder, city, United States Boulder, city (1990 pop. 83,312), seat of Boulder co., N central Colo.; inc. 1871. A Rocky Mountain resort and a suburb of Denver, it is the seat of the Univ. of Colorado (1876). have worked extensively on these documents and helped resolve many difficulties encountered during the development process. One of the scientists serves as Chairman of TC 90 and manages the international work. Thirteen countries participate in TC 90. The standard on surface resistance of superconductors at microwave frequencies is the first IEC standard for electronic applications of superconductivity. This brings the number of IEC TC 90 published standards to eight. Currently, six more documents are at various stages of development within TC 90. CONTACT: Loren Lor´en p. p. 1. strong p. p. os> of Lose. Noun 1. Loren - Italian film actress (born in 1934) Sofia Scicolone, Sophia Loren Goodrich, (304) 497-3143; goodrich@boulder.nist.gov. |
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