Search

Physical culture and sport are categories that have been associated with physical activity and physical education throughout time while picking up different paradigms of knowledge. However, the prevailing paradigm has been the empirical and analytical view, which focuses only on measurable and observable phenomena. Objective: to identify the concepts and approaches regarding physical culture and sport proposed at the various moments of history, based on the logic of the social determination model that characterizes critical epidemiology. Methodology: a systematic review allowing for the identification of the concepts, theories and models that have been proposed in the field of physical culture and sport, both nationally and internationally. The analysis model used was social determination. Results: physical culture is a concept related to body, culture and movement that is not recognized in the databases. In contrast, it is related to search terms such as sport, recreation and physical activity. However, in some countries physical culture is considered as a set of programs and actions developed from the areas of sport, recreation and physical activity, which is included in public policies and government plans. Discussion: in Colombia there is no clarity on the meaning and implementation of physical culture. Therefore, it is necessary to review this concept, which has been used in the training processes of physical culture, sport and recreation professionals [ABSTRACT FROM AUTHOR]

We have studied the phase behavior of the polymeric system based on poly (ethilene oxide) (PEO) and the organometallic salt potassium trifluoracetate (CF3 COOK). Transparent membranes with mass fraction salt concentration, x, between 0.27 and 0.77 and thickness between 0.2 and 0.5 mm were thermally characterized by using differential scanning calorimetric (DSC) and thermogravimetric analysis (TGA). The results show phase boundaries which are different from those of pure PEO, at temperatures about 390 and 440 K, respectively, which are shifted to lower temperatures an the salt concentration increases, thus showing the formation of new solid phase in the studied system. Moreover, it is shown that this system is thermally stable up to 470 K. Based on the obtained results, it is proposed a phase diagram of the system PEO-CF3 COOK. [ABSTRACT FROM AUTHOR]

Solid polymeric ionic conductors were sintered by solution casting method for diferent salt weight fractions, by adding the cesium trifluroacetate organometalic salt to PEO poly(oxide-ethilene) polymeric matriz.The ray-X patterns for the polimeric electrolyte membranes show PEO amorphous nature when the concentration and temperature salt increase. The DSC plots show that the melting point of the membrane crystalline part shift to lower temperature when the salt concentration is increased. The TG plots show that the membrane are thermally stable up to 423 K. The morphology study show that the membranes are texturized and homogeneus at a microscopic scale, thus presenting uniform topographic surfaces. The EDAX spectra show a chemical composition that is in concordance with the mixed componets and therefore a polymer salt complex formation. [ABSTRACT FROM AUTHOR]