Dynamical Stability and Predictability of Football Players: The Study of One Match

The game of football demands new computational approaches to measure individual and collective performance. Understanding the phenomena involved in the game may foster the identification of strengths and weaknesses, not only of each player, but also of the whole team. The development of assertive quantitative methodologies constitutes a key element in sports training. In football, the predictability and stability inherent in the motion of a given player may be seen as one of the most important concepts to fully characterise the variability of the whole team. This paper characterises the predictability and stability levels of players during an official football match. A Fractional Calculus (FC) approach to define a player’s trajectory. By applying FC, one can benefit from newly considered modeling perspectives, such as the fractional coefficient, to estimate a player’s predictability and stability. This paper also formulates the concept of attraction domain, related to the tactical region of each player, inspired by stability theory principles. To compare the variability inherent in the player’s process variables (e.g., distance covered) and to assess his predictability and stability, entropy measures are considered. Experimental results suggest that the most predictable player is the goalkeeper while, conversely, the most unpredictable players are the midfielders. We also conclude that, despite his predictability, the goalkeeper is the most unstable player, while lateral defenders are the most stable during the match.

CDIO and the European Project Semester: a match for capstone projects?

The CDIO Initiative is an open innovative educational framework for engineering graduation degrees set in the context of Conceiving – Designing – Implementing – Operating real-world systems and products, which is embraced by a network of worldwide universities, the CDIO collaborators. A CDIO compliant engineering degree programme typically includes a capstone module on the final semester. Its purpose is to expose students to problems of a greater dimension and complexity than those faced throughout the degree programme as well as to put them in contact with the so-called real world, in opposition to the academic world. However, even in the CDIO context, there are barriers that separate engineering capstone students from the real world context of an engineering professional: (i) limited interaction with experts from diverse scientific areas; (ii) reduced cultural and scientific diversity within the teams; and (iii) lack of a project supportive framework to foster the complementary technical and non-technical skills required in an engineering professional. To address these shortcomings, we propose the adoption of the European Project Semester (EPS) framework, a one semester student centred international capstone programme offered by a group of European engineering schools (the EPS Providers) as part of their student exchange programme portfolio. The EPS package is organised around a central module – the EPS project – and a set of complementary supportive modules. Project proposals refer to open multidisciplinary real world problems and supervision becomes coaching. The students are organised in teams, grouping individuals from diverse academic backgrounds and nationalities, and each team is fully responsible for conducting its project. EPS complies with the CDIO directives on Design-Implement experiences and provides an integrated framework for undertaking capstone projects, which is focussed on multicultural and multidisciplinary teamwork, problem-solving, communication, creativity, leadership, entrepreneurship, ethical reasoning and global contextual analysis. As a result, we recommend the adoption of the EPS within CDIO capstone modules for the benefit of engineering students.

A Real Time Vision System for Autonomous Systems: Characterization during a Middle Size Match

in RoboCup 2007: Robot Soccer World Cup XI

The phosphate fixing capacities of two soils from the Piracicaba municipality: latosol and sands

An essay was carried out under laboratory conditions in order to know the phosphate fixing capcity of a Latosol and a Sands from the municipality of Piracicaba, State of São Paulo, Brazil. The results showed that they were able to fix about 1,588 and 274 kg/ha of P2O5> respectively.

The relevance of post-match LTC: why has the Spanish labor market become as volatile as the US one?

We present a Search and Matching model with heterogeneous workers (entrants and incumbents) that replicates the stylized facts characterizing the US and the Spanish labor markets. Under this benchmark, we find the Post-Match Labor Turnover Costs (PMLTC) to be the centerpiece to explain why the Spanish labor market is as volatile as the US one. The two driving forces governing this volatility are the gaps between entrants and incumbents in terms of separation costs and productivity. We use the model to analyze the cyclical implications of changes in labor market institutions affecting these two gaps. The scenario with a low degree of workers’ heterogeneity illustrates its suitability to understand why the Spanish labor market has become as volatile as the US one.

A New Method for Fixing Biomphalaria glabrata for Histologic Studies, Using Shell Perforation

A new technique for fixation of Biomphalaria glabrata for histologic studies is described. It consists in performing several external holes in the shell, before placing the entire snail into the fixative. It is a very practical and quick procedure that showed excellent results when compared to the usual techniques.

Colombes, 17/2/20, match France contre Pays de Galles [rugby, cérémonie d'avant-match, équipe de France] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 58071

[25/2/20, stade Jean-Bouin, match de football] Polytechnique [contre] St Cyr, le général [Albert-Joseph] Tanant [de St Cyr] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 58204

1/1/20, Struxiano [Philippe], capitaine de l'équipe de France [de rugby posant avant le match France-Écosse au Parc des princes] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 57441

[1-1-20], Angus [Alexander] capitaine de l'équipe d'Écosse [de rugby posant avant le match France-Écosse au Parc des princes] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 57442

Général de Sérigny [Serrigny] de Polytechnique [assistant au match de football Poytechnique contre St Cyr le 25-2-20 au stade Jean-Bouin] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 58205

Parc des Princes, 1/1/20, rugby, match France-Écosse, M. Deschanel félicitant Struxiano [capitaine de l'équipe de France] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 57443

Stade Bergeyre, 11/1/20, rugby, match Olympique contre Société générale [des rafales de vent arrachent la toiture des tribunes populaires] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 57583

Colombes, 17/2/20, match France contre Pays de Galles [rugby, cérémonie d'avant-match, hommage rendu par les Gallois aux joueurs morts pendant la guerre] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 58075