admcycles - a Sage package for calculations in the tautological ring of the moduli space of stable curves

The tautological ring of the moduli space of stable curves has been studied extensively in the last decades. We present a SageMath implementation of many core features of this ring. This includes lists of generators and their products, intersection numbers and verification of tautological relations. Maps between tautological rings induced by functoriality, that is pushforwards and pullbacks under gluing and forgetful maps, are implemented. Furthermore, many interesting cycle classes, such as the double ramification cycles, strata of k-differentials and hyperelliptic or bielliptic cycles are available. In this paper we show how to apply the package, including concrete example computations

Ergodic infinite group extensions of geodesic flows on translation surfaces

We show that generic infinite group extensions of geodesic flows on square tiled translation surfaces are ergodic in almost every direction, subject to certain natural constraints. Recently K. Fr\c{a}czek and C. Ulcigrai have shown that certain concrete staircases, covers of square-tiled surfaces, are not ergodic in almost every direction. In contrast we show the almost sure ergodicity of other concrete staircases. An appendix provides a combinatorial approach for the study of square-tiled surfaces

revista de Ciências da Arte

(...) Sabendo que já superámos essa construção do «louco» da sociedade disciplinar, permitimo-nos nestes dois volumes de Convocarte a desafiar o estigma. Se pensámos inicialmente para tema, e por inibição que assumimos, a palavra Mania (do grego μανία, «estado de loucura», e de mainesthai, «estar em furor, estar com raiva»), aceitámos o desafio de Stefanie Gil Franco, investigadora especializada nas relações entre a arte e a loucura, a quem convidámos para coordenação científica desta abordagem, para esse confronto directo com a questão através do tema: Arte e Loucura. Apesar de já não se confinar o louco na cela da modernidade disciplinar, e os hospitais psiquiátricos terem evoluído bastante desde finais do século XX, o estigma ainda circula na linguagem, sendo visível na dificuldade em abordar o tema, em falar directa e abertamente, como se o estigma, como uma sombra, ainda abafasse o debate franco e crítico. O lançamento deste tema em Convocarte ambicionou focar alguma luz crítica nessa sombra com o propício apoio das relações com a arte. Trata-se de confrontar o estigma e de fornecer um lugar de escuta à voz da loucura para saúde da própria razão, o que nos fez lembrar a frase de Deleuze sobre a doença de Nietzsche: «[...] quando Nietzsche se tornou demente, foi precisamente quando perdeu esta mobilidade, esta arte de deslocamento, ao não poder mais, pela sua saúde, fazer da doença um ponto de vista sobre a saúde».info:eu-repo/semantics/publishedVersio

Mind the gap: Balancing alliance network and technology portfolios during periods of technological uncertainty

While clique-embeddedness is generally considered to enhance firm performance, there are also reasons to expect that under conditions of technological turbulence clique-membership is less beneficial or might even become a liability. To address this, we study the innovative performance of clique members during periods of both technological change and technological stability. We find support for the idea that companies’ ability to adapt their alliance network (i.e. forming ties beyond the scope of the clique) and their ability to adapt their technology portfolios (i.e. access to novel technological knowledge) positively influences their innovative performance during technologically turbulent periods

Effects of a Strength Training Session After an Exercise Inducing Muscle Damage on Recovery Kinetics.

Abaïdia, A-E, Delecroix, B, Leduc, C, Lamblin, J, McCall, A, Baquet, G, and Dupont, G. Effects of a strength training session after an exercise inducing muscle damage on recovery kinetics. J Strength Cond Res 31(1): 115-125, 2017-The purpose of this study was to investigate the effects of an upper-limb strength training session the day after an exercise inducing muscle damage on recovery of performance. In a randomized crossover design, subjects performed the day after the exercise, on 2 separate occasions (passive vs. active recovery conditions) a single-leg exercise (dominant in one condition and nondominant in the other condition) consisting of 5 sets of 15 eccentric contractions of the knee flexors. Active recovery consisted of performing an upper-body strength training session the day after the exercise. Creatine kinase, hamstring strength, and muscle soreness were assessed immediately and 20, 24, and 48 hours after exercise-induced muscle damage. The upper-body strength session, after muscle-damaging exercise accelerated the recovery of slow concentric force (effect size = 0.65; 90% confidence interval = -0.06 to 1.32), but did not affect the recovery kinetics for the other outcomes. The addition of an upper-body strength training session the day after muscle-damaging activity does not negatively affect the recovery kinetics. Upper-body strength training may be programmed the day after a competition

A set of sequences of complexity 2n+12n+1

peer reviewe

Recovery From Exercise-Induced Muscle Damage: Cold-Water Immersion Versus Whole-Body Cryotherapy.

PURPOSE: To compare the effects of cold-water immersion (CWI) and whole-body cryotherapy (WBC) on recovery kinetics after exercise-induced muscle damage. METHODS: Ten physically active men performed single-leg hamstring eccentric exercise comprising 5 sets of 15 repetitions. Immediately postexercise, subjects were exposed in a randomized crossover design to CWI (10 min at 10°C) or WBC (3 min at -110°C) recovery. Creatine kinase concentrations, knee-flexor eccentric (60°/s) and posterior lower-limb isometric (60°) strength, single-leg and 2-leg countermovement jumps, muscle soreness, and perception of recovery were measured. The tests were performed before and immediately, 24, 48, and 72 h after exercise. RESULTS: Results showed a very likely moderate effect in favor of CWI for single-leg (effect size [ES] = 0.63; 90% confidence interval [CI] = -0.13 to 1.38) and 2-leg countermovement jump (ES = 0.68; 90% CI = -0.08 to 1.43) 72 h after exercise. Soreness was moderately lower 48 h after exercise after CWI (ES = -0.68; 90% CI = -1.44 to 0.07). Perception of recovery was moderately enhanced 24 h after exercise for CWI (ES = -0.62; 90% CI = -1.38 to 0.13). Trivial and small effects of condition were found for the other outcomes. CONCLUSIONS: CWI was more effective than WBC in accelerating recovery kinetics for countermovement-jump performance at 72 h postexercise. CWI also demonstrated lower soreness and higher perceived recovery levels across 24-48 h postexercise

Innovation technologique, changements organisationnels : quels enjeux pour la prévention ? Conférence scientifique de l'INRS. Nancy, 29-31 mars 2017

International audienceLes nouveaux outils d'aide à la production, les dispositifs informatiques de gestion de la production et des flux d'information obligent à repenser les méthodes de prévention. Dans un contexte d'intensification du travail, d’allongement de la vie active, de vieillissement de la population et de concurrence mondialisée, innovation technologique et changements organisationnels associés peuvent être des facteurs de risque pour la santé, notamment mentale, et la sécurité des travailleurs. Ces journées ont abordé la prévention des risques professionnels en lien avec trois principales familles émergentes d’innovations technologiques : celles de l’information, les nouveaux outils d’aide à la production et enfin les dispositifs informatiques de gestion de la production et des flux d’information. L’ensemble des présentations et le recueil de résumés sont disponibles sur le site : www.inrs-innovorg2017.fr/presentations-powerpoint/