Forty-five years are a lot

Testimony of Daniel Divinsky that is part of dossier n ° 14 about the Hispamérica journal

Cuarenta y cinco años son mucho

Testimony of Daniel Divinsky that is part of dossier n ° 14 about the Hispamérica journal.Testimonio de Daniel Divinsky que forma parte del dossier n°14 acerca de la revista Hispamérica

Climatic Fluxes of Bottom Sediments in the Sea of Azov

Purpose. The work is aimed at obtaining a general picture of sediment transport in the Sea of Azov over a climatic period. Methods and Results. The research was carried out by the numerical modeling methods using modern hydrodynamic and wave models, as well as the sediment transport model that takes into account the combined effects of sea currents and wind waves. The Azov Sea hydrodynamic parameters for 42 years – from 1979 to 2020 – were calculated. The output database consists of the hourly spatial fields of the currents’ velocities and directions on five σ -horizons, integral characteristics of the wind waves (heights, periods and directions of propagation), sea levels and the bottom matter fluxes. The total length of the array makes it possible to analyze in detail the individual hydrodynamic situations and seasonal features, and also to make climatic generalizations. The carried out studies resulted in obtaining a qualitative idea of the bottom sediments global (sea-scale) transport in the Sea of Azov. Conclusions. Climatic features of the bottom sediment transport in the Sea of Azov are the following: 1) the main flux is formed as an extensive cyclone that covers the central part of the sea and involves bottom sediments from the western and eastern parts of the sea coast; 2) on the northern coast, near the tip of the Obitochnaya Spit, there are two flows: the first one, predominant, is from the Berdyanskaya Spit, and the second one, less pronounced, is from the Fedotov Spit; the resulting flux forms extensive shoals to the south of the Obitochnaya Spit; 3) the strongest fluxes are formed at the Berdyanskaya and Obitochnaya spits, as well as in the area of the Dolgaya Spit

Síntesis doctrinaria sobre obligaciones reales y el problema de su existencia en nuestra legislación

Fil: Divinsky, Daniel J. Universidad de Buenos Aires. Facultad de Derecho. Buenos Aires, Argentin

Evolution of Rogue Waves in Interacting Wave Systems

Large amplitude water waves on deep water has long been known in the sea faring community, and the cause of great concern for, e.g., oil platform constructions. The concept of such freak waves is nowadays, thanks to satellite and radar measurements, well established within the scientific community. There are a number of important models and approaches for the theoretical description of such waves. By analyzing the scaling behavior of freak wave formation in a model of two interacting waves, described by two coupled nonlinear Schroedinger equations, we show that there are two different dynamical scaling behaviors above and below a critical angle theta_c of the direction of the interacting waves below theta_c all wave systems evolve and display statistics similar to a wave system of non-interacting waves. The results equally apply to other systems described by the nonlinear Schroedinger equations, and should be of interest when designing optical wave guides.Comment: 5 pages, 2 figures, to appear in Europhysics Letter