1,569 research outputs found

    A comprehensive asteroseismic modelling of the high-amplitude delta Scuti star RV Arietis

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    We present a comprehensive asteroseismic study of the double-mode high-amplitude delta Scuti star HD 187642 (RV Arietis). The modelling includes some of the most recent techniques: 1) effects of rotation on both equilibrium models and adiabatic oscillation spectrum, 2) non-adiabatic study of radial and non-radial modes, 3) relationship between the fundamental radial mode and the first overtone in the framework of Petersen diagrams. The analysis reveals that two of the observed frequencies are very probably identified as the fundamental and first overtone radial modes. Analysis of the colour index variations, together with theoretical non-adiabatic calculations, points to models in the range of [7065,7245] K in effective temperature and of [1190, 1270] Myr in stellar age. These values were found to be compatible with those obtained using the three other asteroseismic techniques.Comment: accepted for publication in A&

    Geological framework of the pacific coast sedimentary basins, western colombia

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    The Pacific Coastal Province comprises the Tumaco, San Juan, Atrato and Urabá Basins. Althoughthese basins are laterally contiguous and related to an active margin (convergence of Nazcaand South America Plates) each one is characterized by a distinctive geological framework. The comparativeregional stratigraphic and structural setting of these active basins as well as their petroleumpotential is presented here using 2000 km of 2D seismic profile and information from fifteen exploratorywells. Due to the lack of biostratigraphic control within these basins, only second order sequenceswere recognized based mainly on seismic information.The Tumaco Basin is a forearc basin that comprises four second order sequences, one pre-Mioceneand three post-lower Miocene, which were deposited in deep marine environments. The base ofthe Sequence B (lower Miocene) and C (upper Miocene) were deposited in submarine fan systemsproviding turbiditic coarse clastics. The sequence A (pre-Miocene sequence) could have a thick potentialsource section of shale.The San Juan Basin represents a pull-apart basin comprising rocks from Paleocene to Quaternary,deposited mainly in deep marine environments as well as in neritic environments. The Sierra(Oligocene), Conglomerado La Mojarra (lower Miocene) and Munguidó (upper Miocene) Formations,could provide potential clastic reservoirs). In the Iró Formation also occurs competent rocks (chertsand limestones) highly fractured that represents potential fractured reservoirs. The shaly section of theIró Formation is a potential source rock in the basin.The Atrato basin is an interarc, which comprises by five second order sequences depositedmainly in deep marine environments from Late Cretaceous to Quaternary. The base of the C and Dsequences (Oligocene and middle Miocene respectively) were possibly deposited in submarine fansystems. These levels could provide sandstones and conglomerates as potential reservoirs. Sourcepotential rocks could occur in sequence A (upper Cretaceous-lower Miocene) and sequence B (lowerEocene-Oligocene).The Urabá Basin represents a backarc basin which contains five second order sequences, probablydeposited from Late Cretaceous to Quaternary, mainly in marine to transitional environments.There are three levels with coarse clastic facies. These three levels are in the upper part of theSequence B (Oligocene), in the Sequence C (Oligocene-middle Miocene) and in the Sequence D(Middle Miocene-Pliocene?), which have coarser facies toward the southwest. The Sequences A (upperCretaceous?-Eocene) and B (Eocene) contain pelitic facies in the depocenter of the basin thatcould be potential source rocks.The present study is a preliminar evaluation of the regional geology of the sedimentary basins ofthe Pacific Coast Province. This evaluation provides new ideas about the different geologic featuresof basins developed in a same tectonic setting (convergent margin) and the implications for petroleumpotential. The different characteristics of these basins could be related to differential local rate ofsubduction, different angle of the Benniof zone, transcurrent faults, etc. factors beyond the scope ofthis paper

    Recreational water skiing in people with paraplegia: A study of three cases

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    Objetivos: se analizaron la condición cardiorrespiratoria y la intensidad de esfuerzo durante la práctica recreativa del esquí náutico de slalom. Metodología: participaron tres esquiadores náuticos con paraplejia moderadamente activos. Realizaron un test incremental en un ergómetro de brazos para determinar su VO2pico y los umbrales ventilatorios y completaron 3 sesiones de práctica de esquí náutico, separadas por 48h, registrándose la FC cada 5 s. Resultados: obtuvieron un VO2pico de 22,3 ± 0,6 mL·kg-1·min-1 y los umbrales ventilatorios se analizaron al ~80 y ~50% del VO2pico. La FC media en las sesiones de esquí náutico fue de 111 ppm, lo que representó una intensidad de ~45% de la FC de reserva (FCR), permaneciendo por encima del 40% de la FCR ~12 min. Conclusión: la intensidad moderada de la práctica recreativa de esquí náutico de slalom podría servir para mantener o mejorar la condición cardiorrespiratoria en estas tres personas con paraplejiaObjectives: the cardiorespiratory fitness and the intensity of effort were analyzed during the recreational practice of slalom water skiing. Methodology: three moderately active water skiers with paraplegia participated. They performed an incremental test on an arm ergometer to determine their VO2peak and ventilatory thresholds and completed 3 sessions of water skiing, separated by 48h, where the HR was recorded every 5 s. Results: they obtained a VO2peak of 22.3 ± 0.6 mL·kg-1·min-1 and the ventilatory thresholds were analyzed at ~80 and ~50% of the VO2peak. The average heart rate in the water ski sessions was 111 bpm, which represented an intensity of ~45% of the heart rate reserve (HRR), remaining above 40% of the HRR ~12 min. Conclusion: the moderate intensity of recreational slalom skiing could serve to maintain or improve the cardiorespiratory fitness in these three people with paraplegi

    Evolució de la condició física en jugadores d’handbol en les categories infantil, cadet i juvenil

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    En aquesta investigació s’analitza la condició física de 91 jugadores d’handbol, amb edats compreses entre els 13 i els 18 anys, distribuïdes en tres categories diferents, infantil (n = 30), cadet (n = 32) i juvenil (n = 29). La investigació té caràcter descriptiu i transversal. El principal objectiu és analitzar l’estructura condicional de les jugadores. Per a la valoració es va aplicar la bateria Eurofit, la bateria de Bosco i test d’Abalakov. Es van trobar diferències significatives entre la categoria infantil-cadet en cinc de les 14 variables estudiades, i cap entre la categoria cadet-juvenil. Els millors resultats es van produir en la categoria juvenil. En general, les restants variables sempre van assolir millors valors que la població escolar (en aquelles variables en les quals la comparança va ser possible), però pitjors que els valors presentats per les jugadores de les seleccions espanyoles. En les proves que van valorar la força del tren inferior, els resultats indiquen que a major categoria les diferències són menors entre categories

    Evolución de la condición física en jugadoras de balonmano en las categorías infantil, cadete y juvenil

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    En la presente investigación se analiza la condición física de 91 jugadoras de balonmano, con edades comprendidas entre 13 y 18 años, distribuidas en tres categorías diferentes, infantil (n = 30), cadete (n = 32) y juvenil (n = 29). La investigación tiene carácter descriptivo y transversal. El principal objetivo es analizar la estructura condicional de las jugadoras. Para su valoración se aplicó la batería Eurofit, la batería de Bosco y test de Abalakov. Se encontraron diferencias significativas entre la categoría infantil-cadete en cinco de las 14 variables estudiadas, y ninguna entre la categoría cadete-juvenil. Los mejores resultados se produjeron en la categoría juvenil. En general, las restantes variables siempre alcanzaron mejores valores que la población escolar (en aquellas variables en las que la comparación fue posible), pero peores que los valores presentados por las jugadoras de las selecciones españolas. En las pruebas que valoraron la fuerza de tren inferior, los resultados indican que a mayor categoría las diferencias son menores entre categorías

    Synthesis of Fused Polycyclic Indoles by Brønsted Acid-Catalyzed Intramolecular Alkylation of Indoles with Alcohols

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    An efficient methodology for the synthesis of a series of new fused polyclyclic indoles has been developed by Brønsted acidcatalyzed intramolecular Friedel−Crafts reactions of properly designed indolyl alcohols.Ministerio de Economiá y Competitividad (MINECO) and FEDER (CTQ2013-48937- C2-1-P) and Junta de Castilla y León (BU237U13

    Rock glaciers in the Lumajo valley (Cantabrian Mountains)

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    Los glaciares rocosos contribuyen al conocimiento de la evolución periglaciar y paraglaciar del relieve. En el valle de Lumajo se han cartografiado tres glaciares rocosos situados entre los 1700 y 1500 m de altitud. Sus relaciones de corte con otras formas periglaciares y gravitacionales, así como su granulometría, sugieren una actividad posterior a procesos gravitacionales paraglaciares. Esta actividad muestra, al menos, dos fases: la inicial deforma morrenas de circo previas y la última se interpreta como una fase de retroceso o reactivación en las áreas topográficamente más elevadas. Posteriormente, los glaciares rocosos fueron afectados por procesos gravitacionales, uno de ellos, de gran velocidad y alcanceRock glaciers contribute to the knowledge of the periglacial and paraglacial relief evolution. In the Lumajo valley, three rock glaciers, located between 1700 and 1500 m a.s.l., have been mapped. Their cross-cutting relationships with other periglacial and gravitational landforms, as well as their granulometry, suggest a subsequent activity to paraglacial gravitational processes. This activity displays, at least, two stages: the initial one deforms previous cirque moraines while the last one is interpreted as a retreat or reactivation stage in the highest areas. Afterwards, the rock glaciers fronts were affected by gravitational processes, one of them, of great velocity and reac

    Goal orientations, satisfaction, beliefs in sport success and motivational climate in swimmers.

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    En el presente estudio se plantearon varios objetivos; comprobar las relaciones existentes entre las orientaciones de meta, la satisfacción, las creencias sobre las causas del éxito en el deporte y el clima motivacional percibido en nadadores; examinar el efecto que tiene la orientación de meta en las diferentes dimensiones analizadas; y, por último, predecir la orientación de meta. La muestra estuvo compuesta por 163 nadadores. Los instrumentos utilizados fueron las versiones validadas al castellano del TEOSQ, SSI, BACSSQ y PMCSQ-2. Se realizaron tres tipos de análisis estadísticos: análisis de correlaciones bivariadas, análisis multivariante (MANOVA 2x2) y análisis de regresión lineal múltiple multivariado por pasos. Los resultados mostraron que la capacidad y el aburrimiento son variables predictoras de la orientación de meta hacia el ego, mientras que el esfuerzo y la diversión lo son de las orientaciones de meta hacia la tareaThe present study had several objectives; to check the relationships between goal orientations, satisfaction, beliefs about the causes of success in sport and motivational climate perceived in swimmers; to examine the effect of goal orientation in different dimensions analyzed, and finally to predict goal orientation. The sample consisted of 163 swimmers. The instruments used were validated to Castilian versions of TEOSQ, SSI, BACSSQ and PMCSQ-2. There were three types of statistical analyzes: bivariate correlation analysis, multivariate analysis (MANOVA 2x2) and multiple linear regression analysis stepwise multivariate. The results showed that capacity and boredom are predictors of goal orientation towards the ego, while effort and fun are the goal orientations to the tas
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