Kinematic analysis of the standing long jump in children 6- to 12-years-old

The purpose of this study was to analyze the kinematic variables that determine the performance of the standing long jump in children 6- to 12-years-old. There were 121 healthy children (58 girls) recorded while they performed the standing long jump test. All kinematic variables showed a significant correlation with calculated jump distance and measured jump distance, except for the knee joint angle at maximum shoulder extension angle, ankle joint angle at maximum shoulder extension angle, and shoulder joint angle at maximum knee flexion angle. Stepwise multiple regression analysis showed that sex, age, and body mass index accounted for 51.1% of the jump distance variance. Among all the kinematic variables, take-off distance and take-off speed were accounted for the most of the variation in the jump distance. Physical education teachers and coaches should consider special attention to these anthropometrics and kinematic aspects in improving the standing long jump performance in children.     

High-frequency resistance training does not promote greater muscular adaptations compared to low frequencies in young untrained men

The aim of the study was to compare the effect of resistance training (RT) frequencies of five times (RT5), thrice- (RT3) or twice- (RT2) weekly in muscle strength and hypertrophy in young men. Were used a within-subjects design in which 20 participants had one leg randomly assigned to RT5 and the other to RT3 or to RT2. 1?RM and muscle cross-sectional area (CSA) were assessed at baseline, after four (W4) and eight (W8) RT weeks. RT5 resulted in greater total training volume (TTV) than RT3 and RT2 (P?=?.001). 1?RM increased similarly between protocols at W4 (RT5: 55?±?9?Kg, effect size (ES): 1.18; RT3: 51?±?11?Kg, ES: 0.80; RT2: 54?±?7?Kg, ES: 1.13; P?P?2, ES: 0.54; RT3: 22.0?±?4.6?cm², ES: 0.19; RT2: ES: 0.25; 23.8?±?3.8?cm²; P?2; ES: 0.69; RT3: 23.6?±?4.2?cm², ES: 0.58; RT2: 25.5?±?3.7?cm²; ES: 0.70; P?2; RT3: 21.2?±?4.0?cm²; RT2: 22.9?±?3.8?cm²). Performing RT5, RT3 and RT2 a week result in similar muscle strength increase and hypertrophy, despite higher TTV for RT5.     

RHONN identifier-control scheme for nonlinear discrete-time systems with unknown time-delays

This work presents a neural identifier-control scheme for uncertain nonlinear discrete-time systems with unknown time-delays. This scheme is based on a neural identifier to get a model of the system and a discrete-time block control technique based on sliding modes to generate the control law. The neural identifier is based on a Recurrent High Order Neural Network (RHONN) trained with an Extended Kalman Filter (EKF) based algorithm. Applicability is shown using real-time test results for linear induction motors. Also, a Lyapunov analysis is added in order to prove the semi-globally uniformly ultimately boundedness (SGUUB) of the proposed neural identifier-control scheme.     

Robust sensorless observer-based adaptive sliding modes control of synchronous motors

Using a nonlinear complete order model of a synchronous motor, a robust second order sliding mode observer based control scheme is proposed. For that, a generalized super-twisting 3rd order observer is proposed for nonlinear systems. Based on the proposed observer scheme, a robust rotor flux observer is designed, then, a stator current observer is proposed using a classical super-twisting algorithm for extracting information of the rotor speed by means of the equivalent control method. The control design for the output tracking of a desired reference signal for the rotor speed is carried out with a classical super-twisting sliding mode algorithm and adaptive backstepping techniques. Due to the number of inputs, the flux in the excitation winding, and the direct component of the stator currents are also regulated. Numeric simulations predict a good performance of the closed-loop synchronous motor with parameter variations.     

Les études hispano‐musulmanes en France à l'aube du troisième millénaire

Les études hispano‐musulmanes connurent leur essor en France dès la première partie du XX^e siècle graâce à l'?uvre magistrale d'Evariste Lévi‐Provençal. L'histoire de l'Espagne musulmane de 710 à 1031, fondée sur une profonde connaissance des sources arabes et de l'Islam d'Espagne, fut suivie par de brillantes études sur la civilisation d'al‐Andalus et par de précieuses éditions de textes arabes médiévaux. L'archéologie et l'histoire de l'art hispano‐musulman doivent beaucoup aux remarquables érudits que furent Georges Marçais, Elie Lambert et Henri Terrasse dont le fils, Michel Terrasse, poursuit les travaux à l'heure actuelle. Dès 1959, Rachel Arié s'est consacrée à l'Espagne musulmane au temps des Narides (1232–1492) ; elle a publié à Barcelone en 1982 une étude d'ensemble sur l'Espagne musulmane du VIII^e siècle au XV^e siècle. En outre, cinq ouvrages sur al‐Andalus, de nombreux articles, plusieurs communications de congrès ont illustré son activité d'arabisante et d'historienne. L'arabe hispanique a suscité des recherches lexicographiques au sein d'une équipe du CNRS depuis 1979. L'intérêt pour la pensée spéculative andalouse a été mis en lumière depuis 1956 par Roger Arnaldez et à partir de 1972 par Dominique Urvoy. Marie‐Thérèse Urvoy s'est penchée sur la question des Mozarabes. La poésie andalouse en arabe classique au XI^e siècle qui avait retenu l'attention d'Henri Pérès dès 1937 a fait l'objet de plusieurs articles dans la seconde édition de l'Islam depuis 1954. La participation française dans le domaine de l'Espagne musulmane s'est avérée notable dans ce monument d'érudition.     

The politics of privatisation,decentralisation and education reform in Mexico

Reform in the Mexican education system accords with global patterns of liberalisation, decentralisation, compensatory programs and accountability. The present study analyses reform in that country during the past 15 years. It reveals that despite expectations of change attending the installation of the new government which replaced the ruling party dominant for 70 years, there has been far more continuity than change in educational politics. It also shows that these have been constrained by the militant and powerful National Teachers Union. Although the new government has achieved some progress in equity and management, the quality of education can be seen to remain inferior.     

A merging strategy proposal: The 2-step retrieval status value method

A usual strategy to implement CLIR (Cross-Language Information Retrieval) systems is the so-called query translation approach. The user query is translated for each language present in the multilingual collection in order to compute an independent monolingual information retrieval process per language. Thus, this approach divides documents according to language. In this way, we obtain as many different collections as languages. After searching in these corpora and obtaining a result list per language, we must merge them in order to provide a single list of retrieved articles. In this paper, we propose an approach to obtain a single list of relevant documents for CLIR systems driven by query translation. This approach, which we call 2-step RSV (RSV: Retrieval Status Value), is based on the re-indexing of the retrieval documents according to the query vocabulary, and it performs noticeably better than traditional methods. The proposed method requires query vocabulary alignment: given a word for a given query, we must know the translation or translations to the other languages. Because this is not always possible, we have researched on a mixed model. This mixed model is applied in order to deal with queries with partial word-level alignment. The results prove that even in this scenario, 2-step RSV performs better than traditional merging methods.