Isobaric molar heat capacities of the mixture (p-cymene + ethanol) at several temperatures and atmospheric pressure

Experimental isobaric molar heat capacities at atmospheric pressure have been determined every 10 K for the mixture p-cymene (1) + ethanol (2) in the temperature interval (298.6–328.4) K over the whole composition range with a Calvet type calorimeter. Densities, necessary for calculating heat capacities, have been also measured in the same conditions. Excess molar volumes have been calculated from densities. Excess molar heat capacities have been calculated from the molar heat capacities, their values being positive and increasing as the temperature rises. Excess properties are discussed in terms of intermolecular interactions. The solvation model COSMO-RS has been applied to predict the excess molar heat capacities. The model predicts fairly well the values of the excess heat capacities

Anthropometric and equipment characteristics in adolescent sprint kayakers

Los objetivos de este estudio fueron describir las características antropométricas y la configuración del material utilizado por 91 kayakistas españoles adolescentes de 13 y 14 años, de aguas tranquilas y buscar correlaciones entre ambas variables. Se valoraron las características antropométricas y las dimensiones del material de competición de noventa y un kayakistas de aguas tranquilas (45 hombres y 46 mujeres), de 13 y 14 años de edad. Los hombres kayakistas de 14 años presentaron valores superiores a los de 13 años en cuanto a dimensiones antropométricas y del material de competición, mientras que no se encontraron diferencias significativas entre las variables analizadas entre las mujeres kayakistas de 13 y 14 años. La talla y envergadura presentaron las mayores correlaciones con la longitud de la pala y la distancia asiento - reposapiés. La información aportada por este trabajo podría ser de utilidad para ajustar las dimensiones del material de competición, optimizando así el confort y rendimiento en kayakistas jóvenes.The aims of this study were to describe kinanthropometric characteristics and equipment set-up of male and female young kayakers and to look for correlations between both variables. Ninety one young sprint kayakers (45 males and 46 females), aged 13 and 14 years old, were assessed using a battery of 12 anthropometric and 5 equipment dimensions. Comparison between the 13- and 14-year-old kayakers showed that 14-year-old males had greater body and equipment dimensions than their 13-year-old counterparts, whereas there were no significant differences between 13- and 14-year-old female kayakers in both anthropometric and equipment set-up dimensions. Stretch stature and arm span were the variables which greater coefficient correlations showed with total paddle length and seat - feet bar distance. The data presented in this paper may provide important information to adjust equipment sep-up in order to optimise comfort and performance in young kayakers

Propiedades mecánicas y acústicas de hormigones con áridos reciclados y neumáticos fuera de uso

Industrial progress used to be linked to the produce of large waste volumes. These industrial by-products are deposited in landfills despite these ones could be used to manufacture others. In fact, the construction industry could incorporate these materials to contributing to greater environmental balance. This paper studies the manufactured of concrete using as aggregates two kind of different wastes: construction and demolition wastes as well as recycled tires rubber (NFU). Natural fine fraction is replaced by a 10% by volume of industrial products analyzed. The mechanical behaviour and the acoustic properties of concrete made with recycled aggregates are studied. Results show a reduction in mechanical properties by using recycled aggregates and NFU. Nevertheless, it is observed that concrete made with fine recycled aggregate fraction of NFU could be employed with all the guarantees to produce concrete for non-structural applications.El progreso industrial lleva asociado la generación de grandes volúmenes de residuos que, en la mayoría de los casos, acaban en los vertederos, desperdiciando su potencial como materias primas para otros sectores industriales, como es el sector de la construcción, por lo que debe considerarse su reutilización en nuevas aplicaciones e incorporación como subproducto en el campo de los materiales de construcción, dando lugar a materiales más ecoeficientes y respetuosos con el medioambiente. Este trabajo estudia el empleo de áridos reciclados procedentes de residuos de construcción y demolición, y caucho procedente de neumáticos fuera de uso (NFU) en la fabricación de hormigones. La fracción fina natural ha sido sustituida por un 10% en volumen de los subproductos industriales analizados. El comportamiento físico, mecánico y las propiedades acústicas de los hormigones ha sido comparado con los hormigones de referencia. En los resultados se observa una reducción de las resistencias mecánicas y del modulo de elasticidad por el empleo de áridos reciclados y NFU. Se muestra que los hormigones fabricados con la fracción fina de áridos reciclados y NFU podrían ser empleados con todas las garantías en hormigones para aplicaciones no estructurales

New data of the genus Boccardia Carazzi, 1893 (Polychaeta: Spionidae) for the Iberian Peninsula and the Atlantic Ocean

The first record for the Iberian coast and the Atlantic Ocean of two species of polychaetous annelids belonging to the genus Boccardia Carazzi, 1893 (Spionidae) is presented. Boccardia semibranchiata Guérin, 1990 is a recently described species from the Mediteranean Sea, whereas Boccardia proboscidea Hartman, 1940 is a very common species from the Pacific coasts. Both species have been collected in two intertidal zones from San Sebastián (Iberian Peninsula - Bay of Biscay). In the present paper, the collected specimens of both species are described, illustrated and discussed, and notes on their ecology and distribution are included. A simple key for the genus Boccardia for the Atlantic coasts is also provided.Dos especies de anélidos poliquetos pertenecientes al género Boccardia Carazzi, 1893 (Spionidae) se citan por primera vez para la costa de la península Ibérica y aguas del océano Atlántico. Boccardia semibranchiata Guérin, 1990 es una especie descrita recientemente en el mar Mediterráneo, mientras que Boccardia proboscidea Hartman, 1940 es una especie común en las costas del Pacífico. Ambas especies de poliquetos han sido recolectadas en dos zonas intermareales de San Sebastián (península Ibérica - golfo de Vizcaya). En el presente trabajo se realiza una descripción de los ejemplares colectados de ambas especies, se ilustran y se discuten, aportándose, además, notas sobre su distribución y ecología. Complementariamente, se presenta una sencilla clave del género Boccardia para el Atlántico.Instituto Español de Oceanografí

On the entropy of a stealth vector-tensor black hole

We apply Wald's formalism to a Lagrangian within generalised Proca gravity that admits a Schwarzschild black hole with a non-trivial vector field. The resulting entropy differs from that of the same black hole in General Relativity by a logarithmic correction modulated by the only independent charge of the vector field. We find conditions on this charge to guarantee that the entropy is a non-decreasing function of the black hole area, as is the case in GR. If this requirement is extended to black hole mergers, we find that for Planck scale black holes, a non-decreasing entropy is possible only if the area of the final black hole is several times larger than the initial total area of the merger. Finally, we discuss some implications of the vector Galileon entropy from the point of view of entropic gravity

Scavenging Behaviour of Red Deer Cervus elaphus Linnaeus, 1758 (Artiodactyla: Cervidae) in Eastern Spain

A male red deer was repeatedly observed scavenging in eastern Spain. This is the first time this behaviour of the red deer being recorded by means of camera traps. Scavenging behaviour of herbivores may have implications for wildlife biologists and managers