Stefan, Joseph

The rate of radiant thermal energy transfer between two bodies is described by the Stefan-Boltzmann law. Originally proposed in 1879 by Joseph Stefan and verified in 1884 by Ludwig Boltzmann, the Stefan-Boltzmann law states thatthe emission of thermal radiative energy is proportional to the fourth power of the absolute temperature (Kelvin or Rankine) ... 

Stephen R. Decker, John Sheehan, David C. Dayton, Joseph J. Bozell, William S. Adney, Bonnie Hames, Steven R. Thomas, Richard L. Bain, Stefan Czernik, Min Zhang, and Michael E. Himmel... 

A blackbody is defined as a perfect emitler and absorber of radiation. At a specified temperature and wavelength, no surface c.in emit more energy than a blackbody. A blackbody absorbs all incident radiation, regardless of wavelength and direction. Also, a blackbody emits radiation energy unifomily in all directions per um t area normal to direction of emission (Fig. 12-7). That is, a blackbody is a diffuse emitter. The tenti diffitse means independent of direction. The radiation energy emitted by a blackbody per unit time and per unit surface area was determined experimentally by Joseph Stefan in 1879 and expressed as... 

Bahamas, 155,169 Baldwin, Stanley, 50 Balkans, 131-2 Bandera, Stefan, 199 Barcroft, Joseph, 5, 37-8 Bari Harbour disaster, 119—23 Barley, Colonel, 115 Beam operations, 29-30 Beaverbrook, Lord, 113 Beckstrom, Howard D., 119-20 Ben Lomond, 157, 158 Berlin, 104, 105, 125 Bertram, Captain, 3 Bild Zeitung, 221... 

Joseph Landry, Ann Sutton, Stefan T. Tafrov, Ryan C. Heller, John Stebbins, Lorraine Pillus and Rolf Stemglanz, The silencing protein S1R2 and its homologs are NAD-dependent protein deacetylases. Proceedings of the National Academy of Sciences USA, 97 (2000), 5807-5811. 

The total energy radiated per unit surface area of a black body in unit time is proportional to the fourth power of its thermodynamic temperature. The constant of proportionality, the Stefan constant (or Stefan-Boltzmann constant) has the value 5.6697 X 10-8 J g-i jji-2 K". The law was discovered by Joseph Stefan (1853-93) and theoretically derived by Ludwig Boltzmann. 

The radiated power of a body is given by the Stefan-Boltzmann law Joseph Stefan, see box below, and Ludwig Boltzmann, see box in Section 3.1.4) ... 

Joseph Stel (1835-1893), a Slovene-Austrian physicist, is best known for originating the law that the radiation from a black-body is proportional to the fourth power of temperature. In 1884, this law was theoretically derived by his student Ludwig Boltzmann and is known as the Stefan-Boltzmann law. Stefan s electromagnetic equations are also important, as his work on the kinetic theory of heat. He was among the first physicists who understood Maxwell s electromagnetic theory. 

Peter W. 01upot Stefan Jonsson, Joseph K. Byaruhanga ... 

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