26 04 im alumniV8
22 11 im fatiado face
22 11 im fatiado twitter
22 11 im fatiado youtube
22 11 im fatiado gmail
22 11 im fatiado brazil
22 11 im fatiado england
22 11 im fatiado spain

22 07 IM NoticiaTítulo: On chemical flooding models:Riemann problem solutions and viscous fingering phenomenon

Palestrante: Yulia Petrova
Data: 27/07/2022
Horário: 12:00h
Local: Sala C-116

22 04 IM NoticiaTítulo: Singular perturbations and optimal control of stochastic systems in infinite dimension

Palestrante: Andrzej Święch (Georgia Institute of Technology)

Data: 22/04/2021
Horário: 11:00h
Local: Transmissão online.

Confira AQUI o link para a transmissão.

Palestra: Controllability properties of anomalous diffusion phenomena
Palestrante: Sorin Micu (University of Craiova and Institute of Statistical Mathematics and Applied Mathematics, Romênia)

Data: 23/01/2020
Horário: 11h
Sala: C116

Resumo: Many physical phenomena are characterized by an anomalous diffusion when the mean square displacement of a particle will grow at a nonlinear rate in time. Some typical examples are the subdiffusional mobility of the proteic macromolecules in overcrowded cellular cytoplasm and the smoke's superdiffusion in turbulent atmosphere. We consider a simple one dimensional linear model which describes an anomalous diffusive behavior, involving a fractional Laplace operator, and we study its controllability property. If the fractional power of the Laplace operator is less or equal than 1/2 we are dealing with a subdiffusion phenomenon and the system is not spectrally controllable. The aim of the paper is twofold. Firstly, to analyze the possibility of controlling a finite number N of eigenmodes of the solution and to find the behavior of the corresponding controls when N tends to infinity. Secondly, to investigate the null-controllability property of the system when the support of the control moves linearly with respect to time.


Palestra: The cubic fourth order Schrödinger equation on a star graph
Palestrante: Fernando Gallego (Universidad Nacional de Colombia (campus de Manizales))

Data: 13/02/2020
Horário: 11h
Local: Sala - C116

Clique AQUI para conferir o resumo completo.


Titulo: Nonradial blow-up solutions for the Zakharov system
Palestrante: Juan C. Cordero Ceballos (UNAL, Colômbia)

Data: 02/10/2019
Horário: 12:00
Local: Sala - C116

Resumo: We will show that there are nonradial solutions for the Zakharov equations, which have blow-up in finite time in the case of negative energy, due to a virial identity of momentum type. This solutions are standing waves for the Zakharov-Rubenchik system, so we give response to two questions proposed by F. Merle in [1].

[1] F. Merle, Blow-up results of virial type for Zakharov Equations, Communications in Mathematical Physics, 175, 433-455 (1996)
[2] J. C. Cordero, Supersonic limit for the Zakharov-Rubenchik system, Journal Differential Equations, 261 (2016), 5260-5288
[3] J. R. Quintero, J.C. Cordero, Instability of the standing waves for a Benney-Roskes/Zakharov-Rubenchik system and blow-up for the Zakharov equations, Discrete and Continuous Dynamical Systems Series B doi:10.3934/dcdsb.2019217