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radio-frequency identification
(Encyclopedia)radio-frequency identification (RFID), a technology that uses radio waves to transmit data and uniquely identify an animal, person, or thing. An RFID system typically consists of a tag and a reader. T...distillation
(Encyclopedia)distillation, process used to separate the substances composing a mixture. It involves a change of state, as of liquid to gas, and subsequent condensation. The process was probably first used in the p...ultraviolet astronomy
(Encyclopedia)ultraviolet astronomy, study of celestial objects by means of the ultraviolet radiation they emit, in the wavelength range from about 90 to about 350 nanometers. Ultraviolet (UV) line spectrum measure...Chu Ta
(Encyclopedia)Chu Ta or Zhu Da both: jo͞o dä [key], c.1626–c.1705, Chinese painter and calligrapher, also known as Pa-ta-shan-jen or Bada Shanren. Said to have been a descendant of the imperial Ming family, he ...hoe
(Encyclopedia)hoe, usually a flat blade, variously shaped, set in a long wooden handle and used primarily for weeding and for loosening the soil. It was the first distinctly agricultural implement. The earliest hoe...horse latitudes
(Encyclopedia)horse latitudes, two belts of latitude where winds are light and the weather is hot and dry. They are located mostly over the oceans, at about 30° lat. in each hemisphere, and have a north-south rang...Premadasa, Ranasinghe
(Encyclopedia)Premadasa, Ranasinghe, 1924–1993, Sri Lankan political leader. As a member of the Ceylon Labour party, he worked as a labor organizer and was elected deputy mayor of Colombo in 1955. He then joined ...Ottonian art
(Encyclopedia)Ottonian art ŏtōˈnēən [key], art produced (c.900–1050) in the East Frankish kingdom of Germany known, after the emperors Otto (936–1002), as the Ottonian kingdom. Influenced by Byzantine and ...Oldenburg, Claes
(Encyclopedia)Oldenburg, Claes klăs [key], 1929–, Swedish-American artist, b. Stockholm, raised Chicago, studied at Yale, moved to New York 1956. Usually considered part of the pop art movement, Oldenburg explor...spectroscope
(Encyclopedia)spectroscope, optical instrument for producing spectral lines and measuring their wavelengths and intensities, used in spectral analysis (see spectrum). When a material is heated to incandescence it e...Browse by Subject
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