ATOMOSYD

2025

Letellier — 2026-05-02T08:05:06Z

2024

Letellier — 2026-05-02T08:01:19Z

Caterina Mosto, Gisela D. Charó, Christophe Letellier & Denisse Sciamarella Templex-based dynamical units for a taxonomy of chaos Chaos, 34, 113111, 2024 [Online] Abstract Discriminating different types of chaos is still a very challenging topic, even for dissipative three-dimensional systems for which the most advanced tool is the template. Nevertheless, getting a template is, by definition, limited to three-dimensional objects based on knot theory. To deal with higher-dimensional (…)

- Papers

2023

Letellier — 2026-05-02T07:41:42Z

Christophe Letellier, Sylvain Mangiarotti, Ludovico Minati, Mattia Frasca & Jean-Pierre Barbot Optimal placement of sensor and actuator for controlling low-dimensional chaotic systems based on global modeling Chaos, 33, 013140, 2023 Online] Abstract Controlling chaos is fundamental in many applications, and for this reason, many techniques have been proposed to address this problem. Here, we propose a strategy based on an optimal placement of the sensor and actuator providing global (…)

- Papers

2026

Letellier — 2026-04-24T05:12:25Z

I. Leyva, I. Sendiña-Nadal, R. Sevilla-Escoboza, V. P. Vera-Ávila & C. Letellier From chaotic itinerancy to intermittent synchronization in complex networks Physical Review Research, 8, 013328, 2026. Online Abstract Although synchronization has been extensively studied, key processes underlying its emergence in complex networks have remained hidden by the use of global order parameters. Here, we uncover how the route to synchronization unfolds through a sequential transition between two (…)

- Papers

Recollections from the Early Days of Chaos Theory (2026)

Letellier — 2026-04-23T04:36:39Z

This book is both a historical document and a tribute to the people behind the equations — a unique opportunity to witness the birth of chaos theory through the eyes of those who lived it.

- Books

1995 A Wien-bridge oscillator

Letellier — 2022-05-01T17:50:05Z

In the 1980s, many electronic circuits producing chaotic regimes were proposed. Most of the proposed circuits are modifications of a LC circuit which is not convenient to produce audio and lower frequencies. The RC circuits are more acceptable for low frequencies but they are often rather complex. A. Namajhas and Arunas Tamasevicius proposed a simple electronic circuit made of a Wien bridge, a single opamp and a single nonlinear device displaying a current saturation characteristic . The (…)

- Chaos in electronic circuits

Introduction à la circulation des fluides physiologiques (2022)

Letellier — 2022-04-21T09:09:46Z

3ème édition parue le 27 Septembre 2022
Les fluides physiologiques servent au transport de molécules impliquées dans le fonctionnement des grands organismes, des nutriments, de l'oxygène, etc. Par exemple, l'air est apporté aux poumons par la ventilation, le sang diffuse l'oxygène jusqu'aux muscles et extrait les "déchets" comme le dioxyde de carbone pour les éliminer du corps. Ce livre se présente comme une introduction à la mécanique des fluides nécessaire à une première approche de la (…)

- Books

2022

Letellier — 2022-03-15T05:36:09Z

I. Sendiña-Nadal & C. Letellier Observability analysis and observer design of networks of Rössler systems submitted ArXiv, 2203.07447, 2022. Online
Abstract We address the problem of retrieving the full state of a network of Rössler systems from the knowledge of the actual state of a limited set of nodes. The selection of the nodes where sensors are placed is carried out in a hierarchical way through a procedure based on graphical and symbolic observability approaches. By using a map (…)

- Papers

Les ErgoRameurs

Letellier — 2022-01-28T17:23:36Z

Quelques conseils Réglage des sangles : elles doivent passer au niveau de l'articulation du pied le facteur de résistance (drag factor en anglais) : c'est le coefficient de traînée qui permet de quantifier l'énergie dépensée par frottement lors du déplacement du bateau. Sur un bateau, il dépend du poids car, plus le rameur pèse, plus le bateau s'enfonce dans l'eau, et plus la traînée est importante. La FFA propose les valeurs ci-dessous :
ce que nous pouvons transformer en
le brevet (…)

- News

1975 : A 2D predator-prey map

Letellier — 2021-09-25T17:31:54Z

In 1975, John Rex Beddington, C. A. Free and John Lawton proposed a map governing two interacting populations, preys and predators :
where xn designates the preys and yn the predators. This two-dimensional discrete map considers populations with non-overlapping generations and was based on Nicholson-Bailey host-parasite equations to describe the interactions between a population of herbivorous arthropods --- invertebrate animal having an exoskeleton --- and their insect parasitoïds. (…)

- Discrete maps