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quadrant, in technology

(Encyclopedia)quadrant, in technology, angle-measuring device based on a scale of 90°. It is sometimes confused with the sextant, a similar instrument based on a scale of 60°. The quadrant is rarely used today. ...

sideband

(Encyclopedia)sideband, any frequency component of a modulated carrier wave other than the frequency of the carrier wave itself, i.e., any frequency added to the carrier as a result of modulation; sidebands carry t...

Salonen, Esa-Pekka

(Encyclopedia)Salonen, Esa-Pekka, 1958–, Finnish conductor and composer. Originally a French horn player, he studied (1973–77) at Helsinki's Sibelius Academy. He made his conducting debut (1979) with the Finnis...

synchrotron radiation

(Encyclopedia)synchrotron radiation, in physics, electromagnetic radiation emitted by high-speed electrons spiraling along the lines of force of a magnetic field (see magnetism). Depending on the electron's energy ...

Penzias, Arno Allan

(Encyclopedia)Penzias, Arno Allan, 1933–, German-American physicist, b. Munich, Germany, Ph.D. Columbia Univ., 1962. He fled Nazi Germany with his family and after finishing school began work at Bell Telephone La...

Winchell, Walter

(Encyclopedia)Winchell, Walter, 1897–1972, journalist and broadcaster, b. New York City as Walter Winchel. He performed in vaudeville, and adopted a marquee's misspelling of his surname. After serving two years i...

European Southern Observatory

(Encyclopedia)European Southern Observatory (ESO), an intergovernmental organization for astronomical research with headquarters in Garching, near Munich, Germany. The ESO began in 1962 as a consortium among Belgiu...

Munk, Walter Heinrich

(Encyclopedia)Munk, Walter Heinrich, 1917–2019, American oceanographer and geophysicist, b. Vienna (then in Austria-Hungary), B.S. California Institute of Technology, 1939, Ph.D Univ. of California, Los Angeles, ...

virtual telescope

(Encyclopedia)virtual telescope, a computerized interferometer (see interference) that merges the images from two or more telescopes to obtain a single, large, enhanced image. The image in each telescope is made fr...

Tesla, Nikola

(Encyclopedia)Tesla, Nikola tĕsˈlə [key], 1856–1943, American electrician and inventor, b. Croatia (then an Austrian province). An ethnic Serb, he immigrated to the United States in 1884, worked for a short pe...