Influence of oxygen pressure on the fs laserinduced oxidation of molybdenum thin films

We present a study of femtosecond (1028 nm, 230 fs, 54.7 MHz) laser processing on molybdenum (Mo) thin films. Irradiations were done under ambient air as well as pure oxygen (O2) at various gauge pressures (4, 8, 12 and 16 psi). Our results indicate that the high heating rates associated with laser processing allow the production of different molybdenum oxides. Raman spectroscopy and scanning electron microscopy are used to characterize the molybdenum oxidation for the different irradiation and oxygen pressures parameters chosen showing a high correlation between well-defined oxidation zones and the oxygen pressure surrounding the samples during the irradiation of the Mo thin films

Efficiency of football teams from an organisation management perspective

The aim of this paper is to assess the efficiency of football. Our contributions to the literature are the use of the resource-based theory and the strategy-structure-performance perspective as the study''s framework, efficiency has been considered as the result of the qualities of the productive resources in football teams and efficiency is calculated in every area in the field of play. The results show that the entire team''s efficiency is positively related to sporting success and the efficiency of attacking and ball recovery areas is directly related to the sport result and the efficiency of the team as a whole

The Octocoral Fishery in the Southeastern U.S. and Gulf of Mexico

Octocorals, also known as gorgonians and soft corals, were previously managed by the U.S. South Atlantic (SAFMC) and Gulf of Mexico (GMFMC) Fishery Management Councils through a joint Coral Fishery Management Plan (FMP). Because octocorals are mostly collected from Florida waters, the Florida Fish and Wildlife Conservation Commission (FWC) is currently tasked with managing octocoral collection, including the monitoring of colony landings, in the Economic Exclusive Zone (EEZ) adjacent to Florida. Collection of 70,000 colonies per year total, which applies to both state and EEZ waters off Florida, is permitted under Rule 68B- 42.006 of the Florida Administrative Code, but has never been exceeded according to available landings data. Before octocoral management responsibility was transferred to the State of Florida, the SAFMC was concerned that octocoral landings data, as opposed to population data, were being used to set Acceptable Biological Catch limits and Overfishing limits under the new Federal fishery management standards. An additional concern with the octocoral fishery and other organisms captured for the marine aquarium and ornamental fisheries is that large taxonomic groups are lumped together, including species with potentially different life histories and ecological functions. This study assessed some of the characteristics of the octocoral fishery by evaluating FWC Trip Ticket data, conducting interviews with octocoral collectors, and analyzing octocoral life history information and available fishery-independent data on population densities and sizes. Based on interviews with collectors, a synthesis of trip ticket results, and population abundance estimates, the long-term stability of the octocoral fishery is not likely to change significantly. The social dynamics of the aquarium industry to seek colorful, rare, and exotic marine species for home aquaria places octocorals at the lower end of the list of desired species. Octocoral distribution and abundance information obtained from an extensive search of the literature, along with available age, growth, and habitat data, suggests that current information is comprehensive and definitive, such that stock assessment or population dynamic modeling could be considered but are probably not required to assess the status of collected octocoral species. For multiple sampling periods, over a decadal period (1999-09) in the Florida Keys, where most octocoral collection occurs, abundance estimates presented for 15 species illustrate that population sizes are large (tens of millions to hundreds of millions of colonies, per species) and abundance is stable or increasing. For example, the numbers of colonies collected in the Florida Keys in two of the collector categories represented \u3c 0.004% of the estimated population sizes. The collectors and aquarium hobbyists interviewed stated that they would welcome and use a field guide to help with octocoral identification, which would ultimately provide better fishery-dependent taxonomic resolution for collected species. The collection of octocorals below the State of Florida quota of 70,000 colonies per year threshold, which has yet to be reached according to landings data, likely does not adversely affect the octocoral populations targeted. This conclusion is based upon the large population estimates determined for octocorals relative to the small number of colonies collected. This conclusion assumes that the distribution and population sizes of targeted species will continue to be relatively stable or increase. Information collected by the State of Florida through trip tickets is probably adequate to understand and manage the octocoral fishery. Minor reporting clarifications and better taxonomic resolution in reporting would help improve the accuracy of collecting data, but improved accuracy is not required to assess the current state of the fishery-the octocoral fishery is sustainable and would likely remain sustainable at colony collection levels orders of magnitude larger

Hacia un modelo de calidad de las prácticas externas en la Universitat Politècnica de Catalunya (UPC)

La presente comunicación pretende mostrar el trabajo realizado por el Institut de Ciències de l’Educació en la creación de un entorno virtual de docencia, que permite la planificación, seguimiento y evaluación, y facilita la comunicación entre el estudiantado en prácticas, el tutor/a de empresa y el tutor/a académico/a, en las asignaturas de “prácticas externas” que configuran los planes de estudio de las diferentes titulaciones. El trabajo nace de un proyecto subvencionado por el Ministerio de Educación.Peer ReviewedPostprint (published version

Au-supported on Fe-doped ceria solids prepared in water-in-oil microemulsions: Catalysts for CO oxidation

Gold catalysts were synthesized by deposition-precipitation employing Fe-doped ceria systems, previously obtained by means of the water-in-oil microemulsions methodology with different iron contents (10, 25 and 50 Fe at.%). The final catalysts were tested in the CO oxidation reaction in presence of H2. After gold deposition the crystalline structure of the supports was not altered. Moreover no XRD lines associated to gold were detected, indicating its high dispersion. Solid solution was generated in all samples, although the segregation of iron oxide was detected for the material with the highest iron loading. This phenomenon was then enhanced for the corresponding gold catalyst that also presented sintering of the gold nanoparticles. Strong interaction between gold and the oxygen vacancies of the supports was demonstrated, as well as the promotion of the reducibility of surface Ce4+ and Fe3+ species at low temperatures. A remarkable promotion of the CO conversion at lower temperatures respect to that of the supports was observed for the gold catalysts. Below 120 °C, lower the amount of iron incorporated, higher the catalytic performance of the catalyst. This behaviour is closely related not only to a high gold dispersion but also to the ability for creating additional oxygen vacancies in the support, required for the CO oxidation reaction

Fe-doped ceria solids synthesized by the microemulsion method for CO oxidation reactions

A series of Ce-Fe mixed oxides as well as the pure oxides were synthesized by the microemulsions method. The solid solution formation was established for all the Fe-doped systems and only a hardly noticeable segregation of α-Fe2O3 was appreciated for the solid with the maximum iron content (50at.% Fe). The oxygen exchange is improved for all the Fe-doped systems; however the 10at.% Fe appears as the optimal iron content for achieving the maximum oxygen vacancies concentration and the higher reducibility efficiency. The CO oxidation (TOX, PROX) is especially achieved for the solids with the lower iron contents but with a superior oxygen vacancies proportion. These Ce-Fe systems prepared from microemulsions are very attractive to be considered as supports for depositing active phases capable of enhancing oxygen exchange ability of the whole system, allowing higher CO oxidation abilities.Ministerio de Ciencia e Innovación ENE2009-14522-C05-01Junta de Andalucía P09-TEP-545

Probiotics and their potential applications in active edible films and coatings.

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El uso de las ecuaciones como guía para pensar y resolver problemas: una aproximación a la enseñanza de la Física

Within the proposals for the teaching of science we can differentiate various procedures that are effective if you have the right knowledge, reorienting them towards the understanding of the basic conceptual nuclei of science in particular, which can be considered mainly three types of verbal contents: data, concepts and principles. In the teaching of Physics the monitoring of these conditions is applied to the solution of problems and, using the appropriate formulation of equations, students are facilitated the understanding of this science.Dentro de las propuestas para la enseñanza de las ciencias podemos diferenciar diversos procedimientos que son eficaces si se dispone de los conocimientos adecuados, reorientando estos hacia la comprensión de los núcleos conceptuales básicos de la ciencia en particular, en la que pueden considerarse principalmente tres tipos de contenidos verbales: datos, conceptos y principios. En la enseñanza de la Física el seguimiento de estas condiciones se aplica a la solución de problemas y, utilizando la apropiada formulación de ecuaciones, se facilita a los estudiantes la comprensión de esta ciencia

EFECTO DEL INVIERNO Y VERANO SOBRE EL COMPORTAMIENTO REPRODUCTIVO DE TOROS CRUZADOS

Objetivo. Evaluar el efecto del verano e invierno sobre la calidad seminal de toros cruzados en el Valle del Sinú. Materiales y métodos. Se utilizaron 8 toros 75% Bos indicus x 25% Bos taurus, 4 con edades entre 20.5 - 27 meses (menores de 30 meses), con edades entre 32 - 37.5 meses (mayores de 30 meses), mantenidos bajo pastoreo. Cada 28 días se evaluó ganancia de peso, condición corporal, circunferencia escrotal (CE) y viabilidad espermática (MPIR, MPIL, A). Resultados. Las variables climáticas en invierno y verano fueron temperatura máxima 33.2 Vs, 35.1°C, temperatura mínima 24.1 Vs, 23.9°C, humedad relativa 81.8 Vs, 75.4%, precipitación 516.4 Vs, 24.1 mm y brillo solar 6.3 Vs, 5.6. Hubo diferencias significativas por época para la ganancia de peso (