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# Documents  Banica, Valeria | enregistrements trouvés : 3

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## The moment-LP and moment-SOS hierarchies Lasserre, Jean Bernard | CIRM H

Post-edited

Research talks;Control Theory and Optimization

We review basic properties of the moment-LP and moment-SOS hierarchies for polynomial optimization and compare them. We also illustrate how to use such a methodology in two applications outside optimization. Namely :
- for approximating (as claosely as desired in a strong sens) set defined with quantifiers of the form
$R_1 =\{ x\in B : f(x,y)\leq 0$ for all $y$ such that $(x,y) \in K \}$.
$D_1 =\{ x\in B : f(x,y)\leq 0$ for some $y$ such that $(x,y) \in K \}$.
by a hierarchy of inner sublevel set approximations
$\Theta_k = \left \{ x\in B : J_k(x)\leq 0 \right \}\subset R_f$.
or outer sublevel set approximations
$\Theta_k = \left \{ x\in B : J_k(x)\leq 0 \right \}\supset D_f$.
for some polynomiales $(J_k)$ of increasing degree :
- for computing convex polynomial underestimators of a given polynomial $f$ on a box $B \subset R^n$.
We review basic properties of the moment-LP and moment-SOS hierarchies for polynomial optimization and compare them. We also illustrate how to use such a methodology in two applications outside optimization. Namely :
- for approximating (as claosely as desired in a strong sens) set defined with quantifiers of the form
$R_1 =\{ x\in B : f(x,y)\leq 0$ for all $y$ such that $(x,y) \in K \}$.
$D_1 =\{ x\in B : f(x,y)\leq 0$ for ...

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## Dynamics of almost parallel vortex filaments Banica, Valeria | CIRM H

Multi angle

Research talks;Partial Differential Equations;Mathematical Physics

We consider the 1-D Schrödinger system with point vortex-type interactions that was derived by R. Klein, A. Majda and K. Damodaran and by V. Zakharov to modelize the dynamics of N nearly parallel vortex filaments in a 3-D incompressible fluid. We first prove a global in time result and display several classes of solutions. Then we consider the problem of collisions. In particular we establish rigorously the existence of a pair of almost parallel vortex filaments, with opposite circulation, colliding at some point in finite time. These results are joint works with E. Faou and E. Miot. We consider the 1-D Schrödinger system with point vortex-type interactions that was derived by R. Klein, A. Majda and K. Damodaran and by V. Zakharov to modelize the dynamics of N nearly parallel vortex filaments in a 3-D incompressible fluid. We first prove a global in time result and display several classes of solutions. Then we consider the problem of collisions. In particular we establish rigorously the existence of a pair of almost parallel ...

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## Singularities in mechanics: formation, propagation and microscopic description Banica, Valeria ; Bardos, Claude ; Eggers, Jens ; Fontelos, Marco Antonio ; Lannes, David ; Le Berre, Martine ; Mellet, Antoine ; Pomeau, Yves ; Vega, Luis ; Josserand, Christophe ; Saint-Raymond, Laure | Société Mathématique de France 2012

Ouvrage

- xxxiv; 162 p.
ISBN 978-2-85629-769-8

Panoramas et synthèses , 0038

Localisation : Collection 1er étage

Capillarité # surface capillaire # point de rebroussement # évolution des surfaces # singularités en temps fini # mécanique des fluides # problèmes à frontières libres # surfaces libres # homogénéisation # interfaces # Kelvin-Helmholtz # équation non linéaire de Schrödinger # interfaces non linéaires de Schrödinger # Rayleigh-Taylor # autosimilarité # singularités # couches minces # filaments de vorticité # vagues

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