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Shmyhal, Denys Anatoliyovych

(Encyclopedia)Shmyhal or Shmygal, Denys Anatoliyovych, 1975–, Ukrainian politician. An engineer and economist, he worked in the private sector (1995–2009), then served in the state administration for Lviv Oblas...

Rainwater, James

(Encyclopedia)Rainwater, James, 1917–86, American physicist, Ph.D. Columbia, 1946. After working on the Manhattan Project as a student during World War II, he became a professor of physics at Columbia in 1952. Hi...

Perry, Rick

(Encyclopedia)Perry, Rick (James Richard Perry), 1950–, American politician, governor of Texas (2000–2015), b. Haskell, Tex. A fifth-generation Texan from the state's agricultural western plains, he attended Te...

chemical reaction

(Encyclopedia)chemical reaction, process by which one or more substances may be transformed into one or more new substances. Energy is released or is absorbed, but no loss in total molecular weight occurs. When, fo...

enthalpy

(Encyclopedia)enthalpy ĕnˈthălpē [key], measure of the heat content of a chemical or physical system; it is a quantity derived from the heat and work relations studied in thermodynamics. As a system changes fro...

hysteresis

(Encyclopedia)hysteresis hĭsˌtərēˈsĭs [key], phenomenon in which the response of a physical system to an external influence depends not only on the present magnitude of that influence but also on the previous...

Tymoshenko, Yulia Volodymyrivna

(Encyclopedia)Tymoshenko, Yulia Volodymyrivna, 1960–, Ukrainian political leader, prime minister of Ukraine (2005, 2007–10), b. Dnipro (Dnipropetrovsk). She studied economics and cybernetics at Dnipropetrovsk S...

Planck, Max

(Encyclopedia)Planck, Max mäks plängk [key], 1858–1947, German physicist. Seeking to explain the experimental spectrum (distribution of electromagnetic energy according to wavelength) of blackbody radiation, he...

radiation sickness

(Encyclopedia)radiation sickness, harmful effect produced on body tissues by exposure to radioactive substances. The biological action of radiation is not fully understood, but it is believed that a disturbance in ...

Chamberlain, Owen

(Encyclopedia)Chamberlain, Owen, 1920–2006, American physicist, b. San Francisco, Calif., Ph.D. Univ. of Chicago, 1948. He was on the faculty at the Univ. of California, Berkeley, from 1949 until his retirement i...