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AgricultureAgronomy, Horticulture and Aquiculture

Integrable, Nearly Integrable, and Chaotic Systems

Authors: H. Flaschka; J. B. McLaughlin; A. C. Newell; ARIZONA UNIV TUCSON
Abstract:
The inverse spectral method for periodic soliton equations was analyzed and developed for numerical implementation. It was then used to describe shock waves in a one-dimensional discrete medium and spatial chaos in a non-linear partial differential equation. Algebraic and geometric symmetries of soliton equations were studied. Pattern formation and the transition to turbulence in Rayleigh-Benard convection were investigated; a new modulational theory describes 'imperfections' in convection roll patterns. Finally, infinite- dimensional maps associated with bistability in an optical ring cavity were studied, and basic fixed points and first bifurcations were analyzed. Topics discussed were: Solvable models of mathematical physics; Spatial coherence and temporal chaos; Convection in large aspect ratio systems; and Transition to turbulence; and additional keywords: Painleve equations.

Description: Final rept. 1981-1984
Pages: 25
Report Date: 25 MAY 84
Contract Number: DAAG29-82-K-0068
Report Number: A392751

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Keywords relating to this report:
*CONVECTION
*TURBULENCE
ALGEBRA
ASPECT RATIO
CAVITIES
COHERENCE
ENTROPY
GEOMETRY
INVERSION
NONLINEAR DIFFERENTIAL EQUATIONS
ONE DIMENSIONAL
OPTICAL EQUIPMENT
OPTICS
PARTIAL DIFFERENTIAL EQUATIONS
PATTERNS
RINGS
ROLL
SHOCK WAVES
SPATIAL DISTRIBUTION
SPECTRA
SYMMETRY
TRANSITIONS
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