A linearization method of the nonlinear differential equation for conservative nonlinear oscillators is analyzed and discussed. This scheme is based on the Chebyshev series expansion of the restoring force which allows us to obtain a frequency-amplitude relation which is valid…

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A detailed study about the synthesis, characterization and properties of poly(o-methylaniline)(PoMea)/maghnite nanocomposites
has been performed. Changes in the characteristics of the nanocomposites, depending on the intercalated cation
between the clay layers before the synthesis, have been observed. Intercalated morphology has…

Silver halide sensitized gelatin (SHSG) is an interesting technique for the production of holographic optical elements. It combines the high sensitivity of photographic emulsions with the well-known low scattering and high diffraction efficiency corresponding to dichromated gelatin. In this paper…

Recording noise gratings with single-beam exposures in bleached silver halide emulsions is used as a holographic spectroscopy technique in order to analyse and optimize photochemical processing. In particular, rehalogenating type bleachings are analysed by measuring the transmittance through the recorded…

The purpose of the study was to investigate sequences of typical beach volleyball actions to determine action patterns and anticipate athlete’s behaviour. Videos from 18 games including 1645 action sequences consisting of 10918 actions from female World Tour athletes were…

¡Quien no aguanta no vale! Dice un viejo principio rarámuri, grupo étnico ubicado en
la Sierra Tarahumara, dentro de la Sierra Madre Occidental del Estado Chihuahua en
México. Inmerso en un entorno ambiental ecológicamente duro para la supervivencia,
se asume…

Introduction. The effectiveness of using the heart rate (HR) as an indicator of exercise intensity to monitor basketball training has been the subject of intense investigation. However, recent new regulations and a trend towards a more conditional game have prompted…

The physical and physiological demands of high-level male soccer have been studied extensively, while few studies have investigated the demands placed on females during match-play, however, there is no information available about the heart rate and activity profile of young…

The design and analysis of research may cause systematic gender dependent errors to be produced in results because of gender insensitivity or androcentrism. Gender bias in research could be defined as a systematically erroneous gender dependent approach related to social…