N-body U and K matrix program

Computer program was devised to compute free-fall trajectories of satellites, allowing for injection errors and midcourse velocity perturbations. Program consists of trajectory perturbing program and N-body integrating conic program which can also be used as 2-body patch conic program

Bilayer graphene under pressure: Electron-hole Symmetry Breaking, Valley Hall Effect, and Landau Levels

The electronic structure of bilayer graphene under pressure develops very interesting features with an enhancement of the trigonal warping and a splitting of the parabolic touching bands at the K point of the reciprocal space into four Dirac cones, one at K and three along the T symmetry lines. As pressure is increased, these cones separate in reciprocal space and in energy, breaking the electron-hole symmetry. Due to their energy separation, their opposite Berry curvature can be observed in valley Hall effect experiments and in the structure of the Landau levels. Based on the electronic structure obtained by Density Functional Theory, we develop a low energy Hamiltonian that describes the effects of pressure on measurable quantities such as the Hall conductivity and the Landau levels of the system.Comment: 11 pages, 9 figure

Professor Buenaventura Delgado Bujalance. Looks and creative teaching

El profesor Buenaventura Delgado Bujalance desarrolló hasta su muerte una dilatada y creativa actividad como geógrafo. De ella, a modo de homenaje y reconocimiento, queremos destacar en este artículo, por una parte, su convicción de la validez del viaje como fuente de conocimiento, sustentado en la sorpresa, el atrevimiento o la empatía. Por otra, el valor del cuaderno de campo como instrumento de comprensión y trasmisión del conocimiento adquirido y como herramienta de aprendizaje y evaluación. El texto plantea, pues, en primer lugar las bases conceptuales en las que Buenaventura apoya su actividad, para después analizar sus cuadernos de campo y terminar presentando algunos resultados de la propuesta didáctica a través del viaje que, junto a él, hemos ido realizando en los últimos años

The morphodynamic responses of artificial embayed beaches to storm events

The morphological changes caused by storm events in two Barcelona beaches were recorded using video monitoring techniques during the period 2001–2006. Changes in shoreline position and configuration and submerged bar position and shape were analyzed during the 25 major storm events that occurred during the study period. Beach responses to storms were grouped into three categories: shoreline advance or retreat (including rotation), sandbar migration and/or configuration change (linear or crescentic shape) and formation of megacusps. This work provides examples of the differential adaptation of both beaches to the same storm and of some unexpected morphological responses of both beaches. The response of the beach to storm events is not straightforward because wave conditions are not the only relevant parameter to be considered. In particular, in such embayed beaches it is crucial to take into account their specific morphodynamic configuration prior to the storm

Diseño, fundamentación y validación de un programa virtual colaborativo en educación ambiental

Los programas colaborativos constituyen una adecuada herramienta para hacer Educación Ambiental. A lo largo del texto fundamentamos el modelo didáctico MACELEA que ha servido para la creación y puesta en marcha del programa colaborativo virtual de innovación curricular Ecourban. Describimos los aspectos más relevantes para su diseño e implementación, y damos cuenta de los criterios de validez y componentes de innovación virtual que lo sustentan: contextual, pedagógico-didáctica, epistemológica, multimedia, cognitiva y comunicacional.Collaborative programmes are an appropriate tool for Environmental Education. In this work we show the foundations of the didactic model, that we have named MACELEA and which has served for the implementation of a virtual collaborative program to promote the curricular innovation: Ecourban. Here we describe the most relevant dimensions of its design and development, so as the validity criteria and components of virtual innovation: contextual, pedagogical-didactic, epistemological, multimedia, cognitive and communicative

Time variation of Kepler transits induced by stellar spots - a way to distinguish between prograde and retrograde motion. II. Application to KOIs

Mazeh, Holczer, and Shporer (2015) have presented an approach that can, in principle, use the derived transit timing variation (TTV) of some transiting planets observed by the $Kepler$ mission to distinguish between prograde and retrograde motion of their orbits with respect to their parent stars' rotation. The approach utilizes TTVs induced by spot-crossing events that occur when the planet moves across a spot on the stellar surface, looking for a correlation between the derived TTVs and the stellar brightness derivatives at the corresponding transits. This can work even in data that cannot temporally resolve the spot-crossing events themselves. Here we apply this approach to the $Kepler$ KOIs, identifying nine systems where the photometric spot modulation is large enough and the transit timing accurate enough to allow detection of a TTV-brightness-derivatives correlation. Of those systems five show highly significant prograde motion (Kepler-17b, Kepler-71b, KOI-883.01, KOI-895.01, and KOI-1074.01), while no system displays retrograde motion, consistent with the suggestion that planets orbiting cool stars have prograde motion. All five systems have impact parameter $0.2\lesssim b\lesssim0.5$, and all systems within that impact parameter range show significant correlation, except HAT-P-11b where the lack of a correlation follows its large stellar obliquity. Our search suffers from an observational bias against detection of high impact parameter cases, and the detected sample is extremely small. Nevertheless, our findings may suggest that stellar spots, or at least the larger ones, tend to be located at a low stellar latitude, but not along the stellar equator, similar to the Sun.Comment: V2: accepted to Ap

La mirada promiscua. Ensayo de lectura de un paisaje de Doñana desde el diálogo interdisciplinar.

La lectura correcta del paisaje y otras realidades complejas -en las que se mezclan unos elementos objetivos con unas emociones-requiere un método de descifrado que combine la observación y el análisis empírico de sus componentes con las deducciones más comprensivas, como parte de un diálogo interdisciplinar. Una pintora, un historiador, una geógrafa y un novelista –viejos investigadores de Doñana, desde sus respectivas disciplinas- hemos decidido formar un equipo de trabajo que, en base a un método de lectura dialogada del paisaje (Ojeda, 2013), se atreva a ensayar la lectura compartida de un paisaje significativo de este Parque Nacional: La genesíaca Retuerta. Este diálogo de disciplinas humanísticas ante un paisaje poco conocido por el público por situarse en la Reserva Biológica de Doñana, conducirá a nuevas interpretaciones, creatividades y relatos originales y sorprendentes de la Retuerta, que serán nuevos eslabones de las cadenas de su comprensión hermenéutica y su valoración patrimonial.The correct reading of the landscape and other complex realities- -which cross is objective elements with emotions and affections – requires a method of deciphering and interpretation, combining analytical with comprehensive deductions in the framework of an interdisciplinary dialogue. A painter, a historian, a geographer and a novelist - some researchers from Doñana, from their respective disciplines - we have decided to form a team that, based on a method of reading the landscape (Ojeda, 2013), dares to Rehearse the shared reading of a significant landscape of this National Park: The original Retuerta. This dialogue of a humanistic disciplines before a landscape little known by the public to be located in the Biological Reserve of Doñana, will lead to new interpretations, creatives and original and surprising stories of Retuerta, which will be new links to the chain his hermeneutic understanding and granting him a bonus of appreciation and patrimonial valuation

Spanish validation of the revised depression attitude questionnaire (R-daq)

Purpose: The aim of the study was to develop and validate a Spanish version of the Revised Depression Attitude Questionnaire (R-DAQ). Methods: The R-DAQ was used as a baseline for the study. It was translated and tested to ensure the instrument was appropriate for the target population. 537 Ecuadorian healthcare professionals completed the revised Spanish version of the R-DAQ (SR-DAQ). Statistical and exploratory factor analyses were performed to examine construct validity, internal consistency, readability and floor and ceiling effects. Results: Three factors were obtained: “Professional confidence in depression care”; “Therapeutic optimism about depression”; and “Generalist perspective about depression occurrence, recognition, and management”. The internal consistency of the SR-DAQ was determined by means of Cronbach’s α coefficient, with values ranging between 0.61–0.8. The correlations with the English version reflected adequate validity. The model explained 39% of the variance. Subsequent analysis with a sample restricted to those who had received training in depression produced a model that explained 42% of the variance. Conclusion: The SR-DAQ meets the psychometric requirements for measuring depression attitude in a Spanish-speaking population and shows adequate internal consistency and validity

Prótesis de rodilla externa mecatrónica

Se diseña un mecanismo de articulación de rodilla para una prótesis externa, es decir el prototipo puede ser usado en personas con amputaciones del tipo transfemoral, con el fin de contribuir a la sociedad al brindar soluciones a favor de las personas con capacidades especiales. Se toma en consideración los aspectos más relevantes para el desarrollo de la marcha humana protésica normal como son: nivel de actividad física, medidas antropométricas, materiales adecuados para la construcción, estabilidad y confort entre otros. Luego de realizar un análisis extensivo y proceso de diseño y rediseño se construyó un prototipo funcional, que en el futuro podrá ser probado en personas que así lo requieran.Peer Reviewe

The stream of water. Humanistic dialogue about the landscapes of the Marismas del Guadalquivir

El diálogo humanista y transdisciplinar es el instrumento que nos permite ensayar unas lecturas compartidas de tres paisajes de las marismas del Guadalquivir, considerados como tesis (paisaje primigenio de la Retuerta, la Vera del parque nacional Doñana), antítesis (paisaje colonial y arrocero de la Isla Mayor) y síntesis (paisaje simbólico de la Madre–El Rocío) en la configuración territorial y paisajística de aquel espacio singular. Fascinados por unos ambientes marismeños en los que nacimos, de los que huimos para crecer y a los que recurrimos continuamente, asumimos la convicción hermenéutica de que cualquier paisaje se encuentra en un estado de interpretación al que hay que acceder para comprenderlo en toda su plenitud y poder añadir algún eslabón a su cadena interpretativa. La esperanza de que la sinergia de nuestra convergencia generará emergencias es el motor que nos empuja a leer, comprender y buscar nuevos relatos y creatividades de nuestros viejos paisajes.El diàleg humanista i transdisciplinari és l’instrument que ens permet assajar unes lectures compartides de tres paisatges dels aiguamolls del Guadalquivir, considerats com a tesi (paisatge primigeni de la Retuerta, la Vera del Parc Nacional de Doñana), antítesi (paisatge colonial i arrossar de la Isla Mayor) i síntesi (paisatge simbòlic de la Madre–El Rocío) en la configuració territorial i paisatgística d’aquell espai singular. Fascinats per uns ambients d’aiguamolls en els quals vam néixer, dels quals vam fugir per créixer i als quals recorrem contínuament, assumim la convicció hermenèutica que qualsevol paisatge es troba en un estat d’interpretació a què cal accedir per comprendre’l en tota la seva plenitud i poder afegir algun enllaç en la seva cadena interpretativa. L’esperança que la sinergia de la nostra convergència generarà emergències és el motor que ens empeny a llegir, comprendre i buscar nous relats i creativitats dels nostres vells paisatges.The humanistic and multi-disciplinary dialogue is the tool that allows us to assay shared interpretations of three landscapes of the Marismas del Guadalquivir. These landscapes are consider as; thesis (Original Lanscape of the Retuerta, shore of the Doñana National Park), antithesis (Colonial and rice landscape of Isla Mayor), and synthesis (Symbolic landscape of La Madre–El Rocío–) of the territorial and landscape configuration of that remarkable space. Fascinated with the marshlands environments and landscapes where we were born, from where we escaped to grow up but, the ones we constantly appeal; we assume the hermeneutics conviction that any landscape is under a continually stage of interpretation to which you have to access in order to fully understand its meaning and, to be able to add more links to its interpretive chain. The synergy of our conviction will generate new interpretations, which will drive us to read, understand and seek for new stories about our old landscapes