Mineralizaciones estannovolframíferas en Noia y Lousame, estudio previo.

[Resumen] La región estudiada es rica en mineralizaciones de Sn-W, que son agrupadas por su paragénesis y otras características. Se indica el granito sincinemático como posible causante de mineralizaciones (especialmente, San Finx), y al granito tardicinemático (mina Esperanza). La zona per manece en un bajo nivel de investigación[Abstract] The studied region is rich in Sn-W mineralizations, which are grouped by its mineral paragenesis and other caracteristics. Sincinematic granite is suggested as possible causer of the local mineralization (specially San Finx) anf tardicinematic granite ("Esperanza" mine). This region is in_a low research level actuall

Pairs-Production of Higgs in Association with Bottom Quarks Pairs at e+e−e^+e^- Colliders

In a previous paper, we studied the Higgs pair production in the standard model with the reaction $e^{+}e^{-}\to t \bar t HH$. Based on this, we study the Higgs pair production via $e^{+}e^{-}\to b \bar b HH$. We evaluate the total cross section of $b\bar bHH$ and calculate the number total of events considering the complete set of Feynman diagrams at tree-level, and compare this process with the process $e^{+}e^{-}\to t \bar t HH$. The numerical computation is done for the energy which is expected to be available at a possible Next Linear $e^{+}e^{-}$ Collider with a center-of-mass energy $800, 1000, 1600$ $GeV$ and luminosity 1000 $fb^{-1}$.Comment: 12 pages, 6 figure

The ALMA Early Science View of FUor/EXor objects. III. The Slow and Wide Outflow of V883 Ori

We present Atacama Large Millimeter/ sub-millimeter Array (ALMA) observations of V883 Ori, an FU Ori object. We describe the molecular outflow and envelope of the system based on the $^{12}$CO and $^{13}$CO emissions, which together trace a bipolar molecular outflow. The C$^{18}$O emission traces the rotational motion of the circumstellar disk. From the $^{12}$CO blue-shifted emission, we estimate a wide opening angle of $\sim$ 150$^{^{\circ}}$ for the outflow cavities. Also, we find that the outflow is very slow (characteristic velocity of only 0.65 km~s$^{-1}$), which is unique for an FU Ori object. We calculate the kinematic properties of the outflow in the standard manner using the $^{12}$CO and $^{13}$CO emissions. In addition, we present a P Cygni profile observed in the high-resolution optical spectrum, evidence of a wind driven by the accretion and being the cause for the particular morphology of the outflows. We discuss the implications of our findings and the rise of these slow outflows during and/or after the formation of a rotationally supported disk.Comment: 12 pages, 7 figures, 2 tables. Accepte

Las rocas encajantes de la mineralización aurífera en el yacimiento de La Zarza (Huelva)

La mina La Zarza (Strauss et a1.1981) está situada en la zona central del Cinturón Pirítico Ibérico, cerca del pueblo de Silos de Calañas, unos 30 Km al Nordeste de Tharsis y 20 Km al Oeste de Riotint

Antiguas explotaciones de estaño-wolframio en Arteixo y Laracha (resumen)

[Resumen] En los términos municipales de Arteixo y Laracha se conocen una serie de pequeñas explotaciones sobre yacimientos de wolframita-casiterita, de escaso interés tomándolos por separados, pero con importancia potencial en su conjunto. Todos estos yacimientos fueron trabajados de forma muy rudimentaria entre los años 1940 a 1968, fecha en que cerró la última mina de la zona. El único estudio conocido sobre alguno de estos yacimientos corresponde a uno realizado por el Instituto Geológico y Minero, que investigó por medio de prospección geoquímica para Sn-W en la zona de Monteagudo-Lendo, clasificando la zona de Laracha como de interés medio a escaso para estas sustancias

Recursos en Internet para la enseñanza sobre el cuerpo humano

Internet se ha convertido en la mayor y más accesible biblioteca para las personas que disponen de un ordenador con conexión a la misma. Nosotras la hemos utilizado para obtener información útil para la enseñanza sobre el cuerpo humano, utilizando como criterios de búsqueda: «cuerpo humano, human body, ideas previas, unidades didácticas cuerpo humano, human body anatomy y human body unit study». Se presentan los resultados obtenidos organizados en las siguientes temáticas: concepciones de los alumnos, materiales interactivos para la enseñanza, diseño y desarrollo de unidades didácticas, oros contenidos de interés para la enseñanza sobre el cuerpo humano, stios web para seguir buscando y otras referenciasThe Internet has become the biggest and most accessible library for all those with a computer and Internet access. We used the Internet to find useful information for teaching about the human body, using the following terms in search engines: human body, prior ideas, teaching units, human body anatomy, and human body unit study. We present the findings obtained grouped under the following headings: students’ conceptions, interactive teaching materials, design and development of teaching units, other content of interest for teaching about the human body, websites for further searches, and other reference

Process development for bio-ethanol production using wheat straw biomass

Wheat straw is nowadays being considered a potential lignocellulosic raw material (LCM) for fuel-ethanol production as an alternative to starch or sugar-containing feedstock. In this work, the evaluation of process variables (temperature, residence time and particle size) autohydrolysis pretreatment of wheat straw for ethanol production was addressed by means of design of experiments. The recovery of hemicellulose derived sugars (HDS) in the liquid fraction and the ethanol production of the solid residue obtained after filtration of pretreated material were considered as response variables to different processes conditions. Results show that the optimal conditions were 200 ºC and 30 min, leading to HDS recovery yield of 31.88% of HDS content in raw material and ethanol production yield of 80.1% of theoretical