scholarly journals Attractors for a random evolution equation with infinite memory: Theoretical results

2017 ◽  
Vol 22 (5) ◽  
pp. 1779-1800 ◽  
Author(s):  
Tomás Caraballo ◽  
◽  
María J. Garrido-Atienza ◽  
Björn Schmalfuss ◽  
José Valero ◽  
...  
Keyword(s):  
Evolution Equation ◽  
Random Evolution ◽  
Infinite Memory ◽  
Theoretical Results

Subharmonic resonance of Venice gates in waves. Part 1. Evolution equation and uniform incident waves

1997 ◽  
Vol 349 ◽  
pp. 295-325 ◽  
Author(s):  
PAOLO SAMMARCO ◽  
HOANG H. TRAN ◽  
CHIANG C. MEI
Keyword(s):  
Evolution Equation ◽  
Nonlinear Theory ◽  
Laboratory Experiments ◽  
Vertical Plane ◽  
Venice Lagoon ◽  
Subharmonic Resonance ◽  
Sea Waves ◽  
Stormy Weather ◽  
Incident Waves ◽  
Theoretical Results

For flood protection against storm tides, barriers of box-like gates hinged along a bottom axis have been designed to span the three inlets of the Venice Lagoon. While on calm days the gates are ballasted to rest horizontally on the seabed, in stormy weather they are raised by buoyancy to act as a dam which is expected to swing to and fro in unison in response to the normally incident sea waves. Previous laboratory experiments with sinusoidal waves have revealed however that neighbouring gates oscillate out of phase, at one half the wave frequency, in a variety of ways, and hence would reduce the effectiveness of the barrier. Extending the linear theory of trapped waves by Mei et al. (1994), we present here a nonlinear theory for subharmonic resonance of mobile gates allowed to oscillate about a vertical plane of symmetry. In this part (1) the evolution equation of the Landau–Stuart type is first derived for the gate amplitude. The effects of gate geometries on the coefficients in the equation are examined. After accounting for dissipation effects semi-empirically the theoretical results on the equilibrium amplitude excited by uniform incident waves are compared with laboratory experiments.

Large deviations for random evolution equation in Besov-Orlicz space

2020 ◽  
pp. 357-387
Author(s):  
Dina Miora Rakotonirina ◽  
Jocelyn Hajaniaina Andriatahina ◽  
Rado Abraham Randrianomenjanahary ◽  
Toussaint Joseph Rabeherimanana
Keyword(s):  
Evolution Equation ◽  
Large Deviations ◽  
Orlicz Space ◽  
Evolution Equations ◽  
Random Evolution ◽  
Young Function ◽  
Large Deviations Principle

In this paper, we develop a large deviations principle for random evolution equations to the Besov-Orlicz space $\mathcal{B}_{M_2, w}^{v, 0}$ corresponding to the Young function $M_2(x)=\exp(x^2)-1$.

scholarly journals Stroock-Varadhan support theorem for random evolution equation in Besov-Orlicz spaces

2020 ◽  
pp. 187-203
Author(s):  
Jocelyn Hajaniaina Andriatahina ◽  
Dina Miora Rakotonirina ◽  
Toussaint Joseph Rabeherimanana
Keyword(s):  
Differential Equation ◽  
Evolution Equation ◽  
Stochastic Differential Equation ◽  
Stochastic Processes ◽  
Orlicz Space ◽  
Modulus Of Continuity ◽  
Orlicz Spaces ◽  
Random Evolution ◽  
Support Theorem ◽  
The Family

We consider the family of stochastic processes $X=\{X_t, t\in [0;1]\}\,,$ where $X$ is the solution of the It\^{o} stochastic differential equation \[dX_t = \sigma(X_t, Z_t)dW_t + b(X_t,Y_t) dt \hspace*{2cm}\] whose coefficients Lipschitzian depend on $Z=\{Z_t, t\in [0;1]\} $ and $Y=\{Y_t, t\in [0;1]\}$. We prove that the trajectories of $X$ a.s. belong to the Besov-Orlicz space defined by the f nction $M(x)=e^{x^2}-1$ and the modulus of continuity $\omega(t)=\sqrt{t\log(1/t)}$. The aim of this work is to characterize the support of the law $X$ in this space.

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