Scaling the tail beat frequency and swimming speed in underwater undulatory swimming.

Undulatory swimming is the predominant form of locomotion in aquatic vertebrates. A myriad of animals of different species and sizes oscillate their bodies to propel themselves in aquatic environments with swimming speed scaling as the product of the animal length by the oscillation frequency. Although frequency tuning is the primary means by which a swimmer selects its speed, there is no consensus on the mechanisms involved.

Reinforcement learning approach to control an inverted pendulum: A general framework for educational purposes.

Machine learning is often cited as a new paradigm in control theory, but is also often viewed as empirical and less intuitive for students than classical model-based methods. This is particularly the case for reinforcement learning, an approach that does not require any mathematical model to drive a system inside an unknown environment. This lack of intuition can be an obstacle to design experiments and implement this approach.

[Accidents attended in a basic health area of Girona, Spain].

Background: Accidents have been largely unstudied in the area of Primary Care. They are one of the most frequent motives for consultation in the Emergency Services and the first assistance that accident victims receive is usually in primary care centres. Establishment of the incidence and clinicoepidemiological characteristics of the accidents attended in a Basic Health Area can provide important information about which of these could be susceptible to preventive actions.