IEC TECHNICAL COMMITTEE, LED BY NIST, PUBLISHES FOUR NEW SUPERCONDUCTIVITY STANDARDS.Four new international 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 Electrotechnical Commission See IEC. (standard, body) International Electrotechnical Commission - (IEC) A standardisation body at the same level as ISO. (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 61788-3 Superconductivity--Part 3: Critical current measurement--DC critical current of Ag-sheathed Bi-2212 and Bi-2223 oxide superconductors, * IEC 61788-5 Superconductivity--Part 5: Matrix to superconductor A material that has little resistance to the flow of electricity. Traditional superconductors operate at absolute zero (-459.67 degrees Fahrenheit or -273.15 degrees Celsius). Experiments in the 1980s raised the temperature to -321 degrees Fahrenheit. volume ratio measurement--Copper to superconductor volume ratio of Cu/Nb-Ti composite superconductors, * IEC 61788-6 Superconductivity--Part 6: Mechanical properties measurement--Room temperature tensile test of Cu/Nb-Ti composite superconductors, and * IEC 60050-815 International Electrotechnical Vocabulary--Part 815: Superconductivity. 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 have worked extensively on these documents and helped resolve many difficulties encountered during the development process. A NIST scientist serves as chairman of TC 90 and manages the international work. Eleven countries participate in TC 90. The vocabulary was created under TC 90, but all vocabulary publications are listed under TC 1. This vocabulary contains 301 terms and their definitions. The standard on the critical current of oxide superconductors is the first IEC standard on the newer high-temperature superconductors. This brings the number of IEC TC 90 published standards to six. Currently, eight more documents are at various stages of development within TC 90. |
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