EL PROGRAMA DE POSGRADO EN FÍSICA invita a todos para lo seminario:

Stochastic oscillations, power law avalanches and dragon kings in quasi-critical systems
Prof. Dr. Osame Kinouchi
Departamento de Física – FFCLRP – USP

Resumen:

In the last decade, several models with network adaptive mechanisms (link deletion-creation, dynamic synapses, dynamic gains) have been proposed as examples of self-organized criticality (SOC) to explain neuronal avalanches. However, all these systems present stochastic oscillations hovering around the critical region that are incompatible with standard SOC and has been called self-organized quasi-criticality (SOqC). Here we make a linear stability analysis of the mean field fixed points of a SOqC model of discrete time stochastic spiking neurons. Firing rate adaptation, produced by dynamic neuronal gains, tunes the system toward the critical region. We find that the fixed points correspond to barely stable spirals that turn out indifferent at criticality where a Neimark-Sacker bifurcation occurs. This near indifference means that finite-size fluctuations can excite stochastic oscillations and avalanches, producing a mechanism for the emergence of dragon king events. The coexistence of these different types of neuronal activity is an experimental prediction that differs from standard SOC models.

Fecha: 14 de sepetiembre de 2018 – (viernes) Lugar: Sala 212 – Auditorio del Departamento de Física – Horário: 10:15 a.m.

El Programa de Posgrado en Física invita a todos para:

Examen de Cualificación al Doctorado

Igor Dornelles Schoeller Siciliani

Aplicações de Mecânica Estatística em Econofísica, Mineração de Textos e Neurociência

Jurados

Prof. Dr. Marcelo Henrique Romano Tragtenberg – (presidente) – UFSC/FSC
Prof. Dr. Osame Kinouchi Filho – (miembro externo) – USP
Prof. Dr. Lucas Nicolao – (miembro titular) – UFSC/FSC
Prof. Dr. Eraldo Sérgio Barobosa da Silva – (miembro titular) – UFSC/CMN

Fecha: 13 de septiembre de 2018- quinta-feira – Horario: 2 p.m. – Lugar: Auditório Airton Silva – (piso térreo do Departamento de Matemática)

El programa de Posgrado en Física invita a todos para la:

Sustentación de Disertación

Thomas Zerrenner Flórido

ANÁLISE DE LINHAS DE EMISSÃO EM GALÁXIAS: O GÁS DIFUSO IONIZADO NAS GALÁXIAS DO MaNGA

Jurados

Profª. Drª. Natalia Vale Asari – (presidente) – UFSC/FSC
Prof. Dr. Rogemar André Riffel – (miembro externo) – UFSM
Prof. Dr. Abilio Mateus Junior – (miembro titular) – UFSC/FSC

Fecha: 12 de septiembre de 2018 – miércoles – Horario: 2:00 p.m. – Lugar: Sala 202 – Departamento de Matemática