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Dehmelt, Hans Georg

(Encyclopedia)Dehmelt, Hans Georg häns gāˈôrkh dāˈməlt [key], 1922–2017, German-American physicist, b. Gorlitz, Germany, Ph.D. Univ. of Göttingen, 1950. A professor at the Univ. of Washington in Seattle, ...

delta

(Encyclopedia)delta [from triangular shape of the Nile delta, like the Greek letter delta], a deposit of clay, silt, and sand formed at the mouth of a river where the stream loses velocity and drops part of its sed...

Geiger counter

(Encyclopedia)Geiger counter or Geiger-Müller (G-M) counter gīˈgər-mŭlˈər, –myo͞oˈlər [key], instrument for the detection and quantitative determination of ionizing radiation such as the alpha and beta ...

Nambu, Yoichiro

(Encyclopedia)Nambu, Yoichiro yoiˈchērō nämˈbo͞o [key], 1921–2015, Japanese-American physicist, b. Tokyo, D.Sc. Univ. of Tokyo, 1952. He studied at the Institute for Advanced Study, Princeton, with Albert E...

Carman, Harry James

(Encyclopedia)Carman, Harry James, 1884–1964, American historian and educator, b. Greenfield, Saratoga co., N.Y. He was a elementary-school teacher and a high-school principal before becoming an instructor and th...

Keeler, James Edward

(Encyclopedia)Keeler, James Edward, 1857–1900, American astronomer, b. La Salle, Ill. At the age of 21 he went on the Naval Observatory expedition to Colorado to observe the solar eclipse of July, 1878. In 1886 h...

Hahn, Otto

(Encyclopedia)Hahn, Otto ôˈtō hän [key], 1879–1968, German chemist and physicist. His important contributions in the field of radioactivity include the discovery of several radioactive substances, the develop...

Frank, Ilya Mikhailovich

(Encyclopedia)Frank, Ilya Mikhailovich, 1908–90, Soviet physicist, Ph.D. Moscow State Univ., 1935. He was a professor at Moscow State Univ. from 1944 until his death in 1990. Mikhailovich and Igor Y. Tamm won the...

Cockcroft, Sir John Douglas

(Encyclopedia)Cockcroft, Sir John Douglas, 1897–1967, English physicist, educated at the Univ. of Manchester and St. John's College, Cambridge. He was a fellow of St. John's College (1928–46) and professor of n...

photonics

(Encyclopedia)photonics, the science and technology based on and concerned with the controlled flow of photons, or light particles. It is the optical equivalent of electronics, and the two technologies coexist in s...