Examination of the Relationship between Team (Group) Harmony and Role Perception among Players: A Research on Veteran National Players

AbstractThe purpose of the present study is examining the relationship between team (group) harmony and positive role perception. In addition, the present research aims at examining whether there are significant differences in players’ attitudes toward team (group) harmony and role perception in terms of age groups, gender, length of sporting, and country distributions. 29 female, 46 male; a total of 76 elite veteran players selected via random sampling method among elite veteran players who participated in international veteran friendly matches participated in the research. Questionnaire form that consists of three parts was used as the data collection tool of the present study. First part of the questionnaire form includes 4 questions about the players’ personal information; Group Environment Questionnaire developed by Carron et al. (1985) is the second part of the questionnaire; and Role Perception Scale developed by Beauchamp et al. (2002) is the third part of the questionnaire. According to research findings; there are significant differences in players’ team (group) harmony and role perception levels in terms of age groups, gender, length of sporting and country distributions (p<0.005). Research findings revealed a positive significant correlation between team (group) harmony and positive role perception at 0.01 significance level

Roadmap on inorganic perovskites for energy applications

Authors thank EPSRC (EP/P007821/1) and Low Emissions Resources Global for support.Inorganic perovskites exhibit many important physical properties such as ferroelectricity, magnetoresistance and superconductivity as well their importance as Energy Materials. Many of the most important energy materials are inorganic perovskites and find application in batteries, fuel cells, photocatalysts, catalysis, thermoelectrics and solar thermal. In all these applications, perovskite oxides, or their derivatives offer highly competitive performance, often state of the art and so tend to dominate research into energy material. In the following sections, we review these functionalities in turn seeking to facilitate the interchange of ideas between domains. The potential for improvement is explored and we highlight the importance of both detailed modelling and in situ and operando studies in taking these materials forward.Publisher PDFPeer reviewe

An experimental and numerical approach for tuning the cathode for high performance IT-SOFC

Comprendre, contrôler et optimiser le mécanisme de la réaction de réduction de l’oxygène à la cathode, cette démarche devient une nécessité pour améliorer les dispositifs de conversion d'énergie de haute performance tels que les piles à combustible à oxyde électrolyte solide (PAC). Des films poreux à conduction mixte, ionique et électronique (MIEC) et leurs composites comprenant un conducteur ionique offrent des propriétés uniques. Cependant, la corrélation des propriétés intrinsèques des composants d'électrodes aux caractéristiques microstructurales reste une tâche difficile. Dans le cadre de cette thèse, la couche fonctionnelle de cathode de La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) pure et du composite LSCF/Ce0.9Gd0.1O2-δ (CGO) a été élaborée par la technique d’atomisation électrostatique. Une microstructure à porosité hiérarchique a été obtenue dans un domaine nanométrique à micrométrique. Les films ont été recouverts d’un collecteur de courant (CCL), LSCF, par sérigraphie. Une étude paramétrique a été réalisée expérimentalement pour optimiser la double couche en termes de taille de particules, de composition et d'épaisseur des couches de CFL et CCL. En se basant sur ces résultats, un modèle éléments finis 3D a été développé en utilisant les paramètres microstructuraux déterminés par tomographie de FIB-SEM dans une géométrie simple, similaire à des caractéristiques colonnaires. Dans ce travail, un guide de conception du matériau d’électrode a été proposé reliant des performances électrochimiques optimisées à la microstructure et aux propriétés du massif en combinant une étude expérimentale et une étude théorique de modélisation. Une cellule complète de PAC intégrant la cathode optimisée double couche de LSCF a été testée dans des conditions réelles d'exploitation.Understanding, controlling and optimizing the mechanism of oxygen reduction reaction at the cathode need to be addressed for high performance energy conversion devices such as solid oxide fuel cells (SOFCs). Structured porous films of mixed ionic electronic conductors (MIECs) and their composites with addition of a pure ionic conductor offer unique properties. However, correlating the intrinsic properties of electrode components to microstructural features remains a challenging task. In this PhD thesis, cathode functional layers (CFL) of La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) and LSCF/Ce0.9Gd0.1O2-δ (CGO) composite cathodes with hierarchical porosity from nano- to micro-range are fabricated by electrostatic spray deposition technique. The films were topped with LSCF as a current collecting layer (CCL) by screen printing technique. A parametric optimization study was conducted experimentally in terms of particle size, composition, and thickness of CFL and CCL layers. The experimental results were supported by a numerical 3D Finite Element Model (FEM). Microstructural parameters determined by FIB-SEM tomography were used in a simple geometry similar to experimentally observed columnar features. In this work, experimental results and modelling were combined to provide design guidelines relating optimized electrochemical performances to the microstructure and bulk material properties. A complete fuel cell with optimized cathode film was tested in real SOFC operational conditions