منابع مشابه
Desertification by front propagation?
Understanding how desertification takes place in different ecosystems is an important step in attempting to forecast and prevent such transitions. Dryland ecosystems often exhibit patchy vegetation, which has been shown to be an important factor on the possible regime shifts that occur in arid regions in several model studies. In particular, both gradual shifts that occur by front propagation, ...
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Abstract: In the "tennis ball" problem we are given successive pairs of balls numbered (1,2), (3,4),... At each stage we throw one ball out of the window. After n stages some set of n balls is on the lawn. We find a generating function and a closed formula for the sequence 3,23,131,664,3166,14545,65187,287060,1247690,..., the n-th term of which gives the sum over all possible arrangements of th...
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We propose a new discontinuous Galerkin method based on [Y. Cheng and C.-W. Shu, J. Comput. Phys., 223 (2007), pp. 398–415] to solve a class of Hamilton–Jacobi equations that arises from optimal control problems. These equations are connected to front propagation problems or minimal time problems with nonisotropic dynamics. Several numerical experiments show the relevance of our method, in part...
متن کاملReaction front propagation in a turbulent flow.
The propagation of reaction fronts in a turbulent fluid flow is studied by direct numerical simulations in two space dimensions. The velocity field is obtained from integrating the Navier-Stokes equation in two dimensions. We investigate the structure of the reaction front and the enhancement of the front propagation speed due to turbulent mixing. Consistently with earlier theoretical, predicti...
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Background and Objectives: Influence of water mass on sound propagation in the Gulf of Aden underwater acoustics used for communication, navigation and identification of objects by both humans and marine mammals and for investigating the detrimental effects of anthropogenic activities (e.g. pile driving, seismic survey and ships) on marine animals. The Gulf of Aden presents a unique ecosystem t...
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ژورنال
عنوان ژورنال: Journal of the Meteorological Society of Japan. Ser. II
سال: 1943
ISSN: 0026-1165,2186-9057
DOI: 10.2151/jmsj1923.21.4_178