Long-term Handball Teaching: a study of the coaches’ speeches

O objetivo deste estudo foi investigar a preferência/utilização dos métodos de ensino por treinadores de handebol em quatro categorias (sub-12, sub-14, sub-16 e sub-18). Para isso foi elaborado um instrumento de entrevista semiestruturada e aplicado a treinadores do Estado de São Paulo. O Discurso do Sujeito Coletivo foi o método adotado para a tabulação e análise dos discursos, o que permitiu explorar as ideias centrais também em termos quantitativos. Os resultados apontaram particularidades entre as opiniões dos treinadores quando comparadas a alguns modelos descritos na literatura. Destaca-se, especialmente, a presença do método analítico-sintético na categoria sub-12, a presença do método global-funcional em todas as categorias e a crescente preferência/utilização referente ao método situacional. Conclui-se que os resultados apontaram características específicas a um grupo de treinadores do Estado de São Paulo, revelando um importante campo de investigação no âmbito do ensino do handebol.Thee aim of this work was to investigate the preference/use of teaching approaches of handball coaches in four teams (under-12, under-14, under-16 and under-18). Six coaches of Sao Paulo State were interviewed (semistructured instrument). The method of Collective Subject Discourse was adopted for speech analysis, which allowed us to explore the central ideas (qualitative analysis). The results pointed out particularities among the coaches' opinions when comparing with some models proposed. It is noteworthy the presence of the traditional approach in under-12 teams, the presence of the global-functional method (teaching through games) in all teams and a growing preference/use regarding the situational method. It was concluded that the results showed specific characteristics of a group of coaches from the State of Sao Paulo, which revealed an important research field related to handball teaching.Facultad de Humanidades y Ciencias de la Educació

Long-term Handball Teaching: a study of the coaches’ speeches

O objetivo deste estudo foi investigar a preferência/utilização dos métodos de ensino por treinadores de handebol em quatro categorias (sub-12, sub-14, sub-16 e sub-18). Para isso foi elaborado um instrumento de entrevista semiestruturada e aplicado a treinadores do Estado de São Paulo. O Discurso do Sujeito Coletivo foi o método adotado para a tabulação e análise dos discursos, o que permitiu explorar as ideias centrais também em termos quantitativos. Os resultados apontaram particularidades entre as opiniões dos treinadores quando comparadas a alguns modelos descritos na literatura. Destaca-se, especialmente, a presença do método analítico-sintético na categoria sub-12, a presença do método global-funcional em todas as categorias e a crescente preferência/utilização referente ao método situacional. Conclui-se que os resultados apontaram características específicas a um grupo de treinadores do Estado de São Paulo, revelando um importante campo de investigação no âmbito do ensino do handebol.Thee aim of this work was to investigate the preference/use of teaching approaches of handball coaches in four teams (under-12, under-14, under-16 and under-18). Six coaches of Sao Paulo State were interviewed (semistructured instrument). The method of Collective Subject Discourse was adopted for speech analysis, which allowed us to explore the central ideas (qualitative analysis). The results pointed out particularities among the coaches' opinions when comparing with some models proposed. It is noteworthy the presence of the traditional approach in under-12 teams, the presence of the global-functional method (teaching through games) in all teams and a growing preference/use regarding the situational method. It was concluded that the results showed specific characteristics of a group of coaches from the State of Sao Paulo, which revealed an important research field related to handball teaching.Facultad de Humanidades y Ciencias de la Educació

Long-term Handball Teaching: a study of the coaches’ speeches

O objetivo deste estudo foi investigar a preferência/utilização dos métodos de ensino por treinadores de handebol em quatro categorias (sub-12, sub-14, sub-16 e sub-18). Para isso foi elaborado um instrumento de entrevista semiestruturada e aplicado a treinadores do Estado de São Paulo. O Discurso do Sujeito Coletivo foi o método adotado para a tabulação e análise dos discursos, o que permitiu explorar as ideias centrais também em termos quantitativos. Os resultados apontaram particularidades entre as opiniões dos treinadores quando comparadas a alguns modelos descritos na literatura. Destaca-se, especialmente, a presença do método analítico-sintético na categoria sub-12, a presença do método global-funcional em todas as categorias e a crescente preferência/utilização referente ao método situacional. Conclui-se que os resultados apontaram características específicas a um grupo de treinadores do Estado de São Paulo, revelando um importante campo de investigação no âmbito do ensino do handebol.Thee aim of this work was to investigate the preference/use of teaching approaches of handball coaches in four teams (under-12, under-14, under-16 and under-18). Six coaches of Sao Paulo State were interviewed (semistructured instrument). The method of Collective Subject Discourse was adopted for speech analysis, which allowed us to explore the central ideas (qualitative analysis). The results pointed out particularities among the coaches' opinions when comparing with some models proposed. It is noteworthy the presence of the traditional approach in under-12 teams, the presence of the global-functional method (teaching through games) in all teams and a growing preference/use regarding the situational method. It was concluded that the results showed specific characteristics of a group of coaches from the State of Sao Paulo, which revealed an important research field related to handball teaching.Facultad de Humanidades y Ciencias de la Educació

Neutron star properties and the symmetry energy

The effect of the symmetry energy on the properties of compact stars is discussed. It is shown that, for stars with masses above 1 $M_\odot$, the radius of the star varies linearly with the symmetry energy slope $L$. The dependence of the hyperon content and onset density of the direct Urca process on the symmetry energy and meson coupling parametrization are also analyzed.Comment: 12 pages, 20 figures, submitted to Phyical Review

Evidence of fractal structures in hadrons

This study focuses on the presence of (multi)fractal structures in confined hadronic matter through the momentum distributions of mesons produced in proton-proton collisions between 23 GeV and 63 GeV. The analysis demonstrates that the $q$-exponential behaviour of the particle momentum distributions is consistent with fractal characteristics, exhibiting fractal structures in confined hadronic matter with features similar to those observed in the deconfined quark-gluon plasma (QGP) regime. Furthermore, the systematic analysis of meson production in hadronic collisions at energies below 1 TeV suggests that specific fractal parameters are universal, independently of confinement or deconfinement, while others may be influenced by the quark content of the produced meson. These results pave the way for further research exploring the implications of fractal structures on various physical distributions and offer insights into the nature of the phase transition between confined and deconfined regimes.Comment: 23 pages, 11 figures, supplementary materia

ANALYSIS OF DISCRIMINATORY GAME VARIABLES BETWEEN WINNERS AND LOSERS IN WOMEN’S HANDBALL WORLD CHAMPIONSHIPS FROM 2007 TO 2017

The aim of this study was to identify game variables that discriminated winning from losing teams and to understand how these variables contributed to victory by observing goal differences in matches of the women’s handball world championships. The sample comprised 471 WCh’s games played between 2007 and 2017. The games were grouped into three clusters: balanced games – difference of 1-8 goals; unbalanced games – difference of 9-20 goals; and very unbalanced games – difference of > 20 goals. Generally, the performance of winning teams was significantly higher (in most variables), or lower in the case of the number of technical faults (p<.05). In the balanced games, there was a greater contribution of defensive variables (stolen balls, blocked throws, and goalkeeper’s efficiency indicators) in relation to attack variables (attack efficiency and throw efficiency indicators). For victory, the number of technical faults reduce the chances of winning. Games with the unbalanced and very unbalanced goal differences seem to follow the same tendency; however, in the very unbalanced games, there were more assists, yellow cards and 2-min suspensions. We concluded that the decisive variables for victory in the balanced games showed a greater weight, with a special emphasis on stolen balls followed by offensive variables (throw efficiency indicators, attack efficiency, and technical faults). There was an equal tendency for the games with unbalanced and very unbalanced outcomes

INFLUENCE OF THE TYPE OF OXIDANT IN THE COMBUSTION OF NATURAL GAS INSIDE AN ALUMINUM MELTING FURNACE

ABSTRACT The fuel used as energy source for aluminum melting is of extreme importance for a better performance of the process. However, the type of oxidant can also lead to better performance, leading to a greater preservation of the equipments. Air is more abundant and cheaper, however due to the presence of nitrogen, there is undesirable NOx formation. An alternative is to employ pure oxygen. Although it is more expensive, it can lead to a cleaner and much more efficient combustion process, by significantly altering the combustion aspects inside the furnace, such as the shape of the flame and the distribution of temperature and heat flux. In the present work, numerical simulations were carried out using the commercial package FLUENT, analyzing different cases with pure oxygen and air as the oxidant for the combustion of natural gas. The results showed the possible damages caused by the process if long or too intense and concentrated flames are present. Copyright © 2006 by ASME 2 INTRODUCTION There are several industrial combustion applications which may benefit from the use of oxygen-enriched air or pure oxygen as the oxidizer during the combustion process. The resulting effects are many. Oxygen enrichment increases the flame temperature, promotes oxidation, and can lead to smaller pollutant (NOx) emissions compared with hydrocarbon-air systems, due to the absence of nitrogen. The formation of nitrogen oxides (NOx) in air-feed combustion systems represents a significant source for this pollutant within the industrial sector. With the increase in the world-wide utilization of fossil fuels, the control of NOx emissions has become an issue of global concern. Additionally, with increasing oil prices, the use of lower quality fuels will worsen the problem. Advances in computational modeling tools and the increased performance of computers have made comprehensive modeling of NOx formation and destruction a valuable tool to provide insights and understanding of the NOx reaction processes in combustion systems. This technology has the potential to enhance the application of various combustion techniques used to reduce NOx emissions from practical combustion systems Numerical modeling has became an important tool in the design and optimization of industrial equipments and also in the prediction of the emission of pollutants such as CO (carbon monoxide), SOx (sulfur oxides), and NOx. Recently, several numerical studies In the work by Frassoldati et al. [2], the attention was focused on a new procedure, based on CFD, for the determination of NOx emissions from combustion processes, which allowed the use of very detailed reaction schemes. The predictions of NOx were obtained by post-processing the flow and temperature fields, as predicted by the CFD model, and lumping together computational cells similar in terms of NOx formation. The resulting macro-cells were assumed to be a network of ideal reactors, which were simulated adopting detailed kinetic mechanisms. Nieckele et al. [3] described a numerical simulation of the 100% oxy-firing combustion process inside an industrial aluminum re-melting reverb furnace. Three different configurations were analyzed including the comparison between the staged versus non-staged combustion processes. The numerical procedure was based on the finite volume formulation and the κ−ε model of turbulence. The combustion was modeled based on the finite rate models of Arrhenius and Magnussen, and the Discrete Transfer Radiation model was employed for predicting the radiation heat transfer. The numerical predictions allowed for the determination of the flame patterns, species concentration distribution, temperature and velocity fields

COVERED DISTANCES OF HANDBALL PLAYERS OBTAINED BY AN AUTOMATIC TRACKING METHOD

The aim of this work is to obtain the distances covered by handball players and their velocities during a match using a new approach based on automatic tracking method described in Figueroa et. al. (2006a, 2006b) and the Adaboost detector (Okuma, 2004). A whole game of a Brazilian regional handball championship for players under age of 21 was recorded. Applying the mentioned automatic tracking, the accumulated covered distances and the velocities were calculated for all the players. The results of average covered distances (±SD) in the 1st and 2 nd halves were 2199(±230) and 2453(±214). The results of covered distances and the velocities allow individual and collective analyses of the players by the team staff. The proposed method revealed to be a powerful tool to improve physical analysis of the handball players