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that describes the energy states of electrons. (h/2π) 2 2 m = ∇ 2 φ n + (E n + qV ) φ n = 0 where φ n is the wave function corresponding to the subband n whose minimum energy is E n , V is the potential of the region, m is the particle mass, and h and q are Planck’s con- stant and the electronic charge, respectively. Schur matrix a square matrix with real elements and whose all eigenvalues have ab- scientific visualization the use of com- puter graphics techniques to represent com- scintillation the variation of electromag- netic signal strength with time due to random scoreboard term originally used for a cen- tralized control unit in the CDC 6600 proces- Now sometimes used for the simpler mechanism scotopic formally, a description of lumi- nances under which human rod cells are ac- scotopic vision vision in the eye deter- mined by the number of and condition of the SCP See SCR See scram the emergency shutdown of a nu- clear reactor by the rapid insertion of all con- scrambling randomization of a symbol sequence using reversible processes that do scrubber a means of removing sulfur dioxide from coal-burning power plant ex- SCSI See small computer systems interface SDH See SDRAM See SDS See structured distribution systems seal-in relay an auxiliary relay that re- mains energized through one of its own con- sealing current the current necessary to complete the movement of the armature of sealing voltage the voltage necessary to complete the movement of the armature of search coil a solenoid that is wound with an air core or around a magnet or permeable c 2000 by CRC Press LLC |