Difference equations and 1inearization methods for radiative transfer. AUER, L. H. (Los Alamos National Laboratory, Los Alamos, NM) IN: Methods in radiative transfer (A85-16126 05-90). Cambridge and New York, Cambridge University Press, 1984, p. 237-279. 19 Refs. Lang uag e: En g1ish. Country of Origin : United States. Country of Publication: United Kingdom Document Type: ANALYTIC OF COLLECTED WORK Most documents available from AIAA Technical Library J our n a1 Ann oun cement: IAA8505 Techniques for linearizing and solving the nonlinear t ransf er eq u at i on s f or radiati on, t emperat ure, op acity and emissivity in a radiation field are presented. Algebraic equivalents are defined for the differentia1 equations by means of difference equations for spherical and planar transfer problems. The transformations are characterized for energy, population, abundances, and charge conservation and the moment and motion equations along a single ray. The Eddington factor is used to reduce the linear system to one equation per frequency and the Hermitian formula yields a set of linear equations that can be int egratecl over t h e ent ire radiation f i e1d. The connection between the difference and integral equations is noted, with the difference equations being linearized in terms of the local state of the medium. Account is taken of hydrostatic, statistical, and energy e qu i1i bri a cons tr ai n t s. Finally, tech n iques f or speeding up the computations are explored. (M.S.K.) Source of Abstract (Subfile): AIAA/TIS Keywords: *C0MPUTATI0NAL ASTROPHYSICS; *DIFFERENCE EQUATIONS; *LINEARIZATION; *NONLINEAR EQUATIONS; ♦RADIATIVE TRANSFER; ♦STELLAR ATMOSPHERES; APPROXIMATION; ATMOSPHERIC RADIATION; ATMOSPHERIC TEMPERATURE; CONVERGENCE; EMISSIVITY; INTEGRAL EQUATIONS; NONEQUILI DRI UM THERMODYNAMICS; OPACITY Subject Classification: 7570 Physics—General (1975--) Power spectrum of fibre output fluctuation in polarisation-preserving optical fibres. SAKAI, J. (Nippon Telegraph and Telephone Public Corp., Musashino Electrical Communication Laboratory, Musashino, Tokyo, Japan); SHIMIZU, M. (Nippon Telegraph and Telephone Public Corp., Ibaraki Electrical Communication Laboratory, Tokai, Ibaraki, Japan) Electronics Letters (ISSN 0013-5194), vol. 20, Oct. 25, 1984, p. 923-925. 9 Refs. Language: English. Country of Origin: Japan. Country of Publication: United Kingdom Document Type: JOURNAL ARTICLE Most documents available from AIAA Technical Library Journal Announcement: IAA8504 The power spectrum of fibre output intensity fluctuation was measured over 0.001 to 1.0 Hz for elliptical-
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