Cenozoic stress field in the southwestern Antarctic Peninsula from brittle mesostructures in Wright Peninsula, Adelaide Island

Palaeostresses inferred from brittle mesostructures in the southern Wright Peninsula show a stress field characterized by compressional, strike-slip and extensional regime stress states. The compressional stress (σ 1 ) shows a main NW-SE direction and the extensional stress (σ 3 ) shows a relative scattering with two main modes: NE-SW to E-W and NW-SE. The maximum horizontal stress (σ y ) has a bimodal distribution with NW-SE and NE-SW direction. The compressional orientation is related to subduction of the former Phoenix Plate under the Antarctic Plate from the Early Jurassic to the Early Miocene. Extensional structures within a broad-scale compressional stress field can be related to both the decrease in relative stress magnitudes from active margins to intraplate regions and stretching processes occurring in eastern Adelaide Island, which develop a fore-arc or intra-arc basin from the Early Miocene. Stress states with NW-SE-trending σ 1 are compatible with the dominant pattern established for the western Antarctic Peninsula. NW-SE orientations of σ 3 suggest the occurrence of tectonic forces coming from fore-arc extension along the western Antarctic Peninsula.This work was supported by the projects CGL2005-03256/ANT and CGL2007-28812E/ANT of the Spanish Ministry of Education and Scienc

FRIDA: diffraction -limited imaging and integral-field spectroscopy for the GTC

FRIDA is a diffraction-limited imager and integral-field spectrometer that is being built for the adaptive-optics focus of the Gran Telescopio Canarias. In imaging mode FRIDA will provide scales of 0.010, 0.020 and 0.040 arcsec/pixel and in IFS mode spectral resolutions of 1500, 4000 and 30,000. FRIDA is starting systems integration and is scheduled to complete fully integrated system tests at the laboratory by the end of 2017 and to be delivered to GTC shortly thereafter. In this contribution we present a summary of its design, fabrication, current status and potential scientific applications

MIRADAS for the Gran Telescopio Canarias

The Mid-resolution InfRAreD Astronomical Spectrograph (MIRADAS, a near-infrared multi-object echelle spectrograph operating at spectral resolution R=20,000 over the 1-2.5 mu m bandpass) was selected by the Gran Telescopio Canarias (GTC) partnership as the next-generation near-infrared spectrograph for the world's largest optical/infrared telescope, and is being developed by an international consortium. The MIRADAS consortium includes the University of Florida, Universidad de Barcelona, Universidad Complutense de Madrid, Instituto de Astrofisica de Canarias, and Institut d'Estudis Espacials de Catalunya, as well as probe arm industrial partner A-V-S (Spain), with more than 45 Science Working Group members in 10 institutions primarily in Spain, Mexico, and the USA. In this paper, we review the overall system design and project status for MIRADAS during its early fabrication phase in 2016

The Lockman-SpReSO project: description, target selection, observations, and catalogue preparation

© TheAuthors 2023. Artículo firmado por 29 autores. We thank the anonymous referee for their useful report. This work was supported by the Evolution of Galaxies project, of references AYA2017-88007-C3-1-P, AYA2017-88007-C3-2-P, AYA2018-RTI-096188-BI00, PID2019-107408GB-C41, PID2019-106027GB-C41, PID2021-122544NB-C41, and MDM-2017-0737 (Unidad de Excelencia María de Maeztu, CAB), within the Programa estatal de fomento de la investigación científica y técnica de excelencia del Plan Estatal de Investigación Científica y Técnica y de Innovación (2013-2016) of the Spanish Ministry of Science and Innovation/State Agency of Research MCIN/AEI/10.13039/501100011033 and by `ERDF A way of making Europe'. This article is based on observations made with the Gran Telescopio Canarias (GTC) at Roque de los Muchachos Observatory on the island of La Palma, with the Willian Herschel Telescope (WHT) at Roque de los Muchachos Observatory on the island of La Palma and on observations at Kitt Peak National Observatory, NSF's National Optical-Infrared Astronomy Research Laboratory (NOIRLab Prop. ID: 2018A-0056; PI: Gonzalez-Serrano, J.I.), which is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is funded by the National Aeronautics and Space Administration and operated by the California Institute of Technology. J.N. acknowledges the support of the National Science Centre, Poland through the SONATA BIS grant 2018/30/E/ST9/00208. E.B. and I.C.G. acknowledge support from DGAPA-UNAM grant IN113320. M.P. acknowledges the support from the Space Science and Geospatial Institute under the Ethiopian Ministry of Innovation and Technology (MInT). E.A. and M.P. acknowledge the support from the State Agency for Research of the Spanish MCIU through the Center of Excellence Severo Ochoa award to the Instituto de Astrofísica de Andalucía (SEV-2017-0709). J.A.D. acknowledges the support of the Universidad de La Laguna through the Proyecto de Internacionalización y Excelencia, Programa Tomás de Iriarte 2022. The authors thank Terry Mahoney (at the IAC's Scientific Editorial Service) for his substantial improvements of the manuscript.Context. Extragalactic surveys are a key tool for better understanding the evolution of galaxies. Both deep and wide-field surveys serve to provide a clearer emerging picture of the physical processes that take place in and around galaxies, and to identify which of these processes are the most important in shaping the properties of galaxies. Aims. The Lockman Spectroscopic Redshift Survey using Osiris (Lockman-SpReSO) aims to provide one of the most complete optical spectroscopic follow-ups of the far-infrared (FIR) sources detected by the Herschel Space Observatory in the Lockman Hole (LH) field. The optical spectroscopic study of the FIR-selected galaxies supplies valuable information about the relation between fundamental FIR and optical parameters, including extinction, star formation rate, and gas metallicity. In this article, we introduce and provide an in-depth description of the Lockman-SpReSO project and of its early results. Methods. We selected FIR sources from Herschel observations of the central 24 arcmin x24 arcmin of the LH field with an optical counterpart up to 24.5 R_(C)(AB). The sample comprises 956 Herschel FIR sources, plus 188 additional interesting objects in the field. These are point X-ray sources, cataclysmic variable star candidates, high-velocity halo star candidates, radio sources, very red quasi-stellar objects, and optical counterparts of sub-millimetre galaxies. The faint component of the catalogue (R_(C)(AB) ≥ 20) was observed using the OSIRIS instrument on the 10.4 m Gran Telescopio Canarias in multi-object spectroscopy (MOS) mode. The bright component was observed using two multi-fibre spectrographs: the AF2-WYFFOS at the William Herschel Telescope and the HYDRA instrument at the WYIN telescope. Results. From an input catalogue of 1144 sources, we measured a secure spectroscopic redshift in the range 0.03 ≲ z ≲ 4.96 for 357 sources with at least two identified spectral lines. In addition, for 99 sources that show only one emission or absorption line, a spectroscopic redshift was postulated based on the line and object properties, and photometric redshift. In both cases, properties of emission and absorption lines were measured. Furthermore, to characterize the sample in more depth with determined spectroscopic redshifts, spectral energy distribution (SED) fits were performed using the CIGALE software. The IR luminosity and the stellar mass estimations for the sample are also presented as a preliminary description.Depto. de Física de la Tierra y AstrofísicaFac. de Ciencias FísicasTRUEhe Spanish Ministry of SciPrograma estatal de fomento de la investigación científica y técnica de excelencia del Plan Estatal de Investigación Científica y Técnica y de Innovación (2013-2016)Unidad de Excelencia María de Maeztu, CABERDF "A way of making Europe"National Science Centre, Poland through the SONATA BISDGAPA-UNAMSpace Science and Geospatial Institute under the Ethiopian Ministry of Innovation and Technology (MInT)Centro de Excellence Severo OchoaUniversidad de La Laguna. Proyecto de Internacionalización y Excelencia, Programa Tomás de Iriarte 2022pu

Analysis of photovoltaic self-consumption systems

Components and installation prices could make the self-consumption of solar photovoltaic (PV) systems competitive. In this paper, we explore different self-consumption options, off-grid PV systems (with back-up generator and/or batteries), and grid-connected PV systems under net-metering policies. The calculation of the net present cost (NPC) reveals that the grid-connected PV-only case (for the net-metering scheme) is the most attractive from the technical and financial points of view, with a levelised cost of energy less than 0.1 €/kWh. Off-grid PV + Diesel + Batteries has a higher cost, around two or three times the grid-connected PV-only under net metering. Additionally, the off-grid PV + Diesel is less attractive from a financial point of view, which has a cost of around 10 times the PV-only under net metering. In addition, the values of life cycle CO2 emissions in each of the cases studied have been compared, and we have concluded that although the off-grid PV + Diesel + Batteries system presents lower CO2 emissions than the PV-only system, the existence of batteries does not allow one to affirm that the PV + Diesel + Batteries system is the best from an environmental point of view

Sub-arcsecond Morphology of Planetary Nebulae

Planetary nebulae (PNe) can be roughly categorized into several broad morphological classes. The high quality images of PNe acquired in recent years, however, have revealed a wealth of fine structures that preclude simplistic models for their formation. Here we present narrow-band, sub-arcsecond images of a sample of relatively large PNe that illustrate the complexity and variety of small-scale structures. This is especially true for bipolar PNe, for which the images reveal multi-polar ejections and, in some cases, suggest turbulent gas motions. Our images also reveal the presence or signs of jet-like outflows in several objects in which this kind of component has not been previously reported.Comment: 7 pages, 7 figures, Accepted for publication in PAS

Effective optimisation of the patient circuits of an oncology day hospital: Mathematical programming models and case study

In this paper, we first use the information we have on the patients of an oncology day hospital to distribute the treatment schedules they have in each of the visits to this centre. To do this, we propose a deterministic mathematical programming model in such a way that we minimise the duration of the waiting room stays of the total set of patients and taking into account the restrictions of the circuit. Secondly, we will look for a solution to the same problem under a stochastic approach. This model will explicitly consider the existing uncertainty in terms of the different times involved in the circuit, and this model also allows the reorganisation of the schedules of medical appointments with oncologists. The models are complemented by a tool that solves the problem of assigning nurses to patients. The work is motivated by the particular characteristics of a real hospital and the models are used and compared with data from this case.This research has been funded by the ERDF, the Government of Spain/AEI [grant MTM2017- 87197-C3-3-P] and the Xunta de Galicia [Grupos de Referencia Competitiva ED431C2017/38, and ED431C 2021/24].S

Políticas de retribución para sistemas fotovoltaicos conectados a red

En esta tesis se han analizado las estrategias que se han aplicado, y otras que podrían aplicarse, con el fin de impulsar el mercado fotovoltaico teniendo en cuenta el necesario equilibrio entre sostenibilidad, beneficio y competitividad. Se ha estudiado la situación en España de la paridad de red fotovoltaica, utilizando para ello el Levelized Cost of Energy (LCOE) y la Tasa Interna de Retorno de la inversión (TIR), analizando la opción de incluir autoconsumo. Además, se han realizado varios estudios y análisis con el fin de determinar cuándo y cómo se podría alcanzar la paridad de red fotovoltaica, aplicando para ello cálculos determinísticos y una técnica probabilística (Montecarlo).En el inicio del desarrollo del sector fotovoltaico, por ser una tecnología de baja eficiencia comparada con otras fuentes de generación eléctrica, y por tener un elevado coste y no estar suficientemente madura, se aplicaron políticas basadas en subvenciones gubernamentales. España y Alemania fueron los precursores en este tipo de políticas. Posteriormente, también las aplicaron Italia, Francia y Reino Unido. Tras esta primera fase, se redujeron las tarifas subsidiarias como consecuencia de la reducción de los costes y de una mejora en la eficiencia de los componentes de las plantas fotovoltaicas, desarrollándose el sector hasta llegar a la paridad con la red, momento en el que la tecnología fotovoltaica llegó a ser competitiva frente a otras fuentes de energía. En primer lugar, se analizaron las diferentes políticas de remuneración aplicadas en Europa, estudiando el efecto de estas políticas de remuneración en el mercado global y en las expectativas de los inversores. Las diferentes políticas de remuneración llevadas a cabo en los países miembros de la Unión Europea han sido: Feed in Tariff (FiT), bonos verdes, beneficios fiscales e incentivos a la inversión y subastas de energía. En la segunda parte de esta tesis se estudió la paridad de red (Grid Parity), analizando varios casos de instalaciones fotovoltaicas conectadas a la red eléctrica en España. La paridad de red se alcanza cuando el precio minorista de la electricidad es, al menos, igual al coste de generación que se obtiene a partir de los costes de las diferentes fuentes de energía del parque generador: nuclear, gas natural, carbón, petróleo, hidroeléctrica, eólica, fotovoltaica, etc. El parámetro utilizado para el estudio fue el LCOE. El análisis del LCOE permite determinar si una tecnología de generación se encuentra lejos, o cerca, de lograr la paridad de red. En la tercera parte de esta tesis se analizó la opción de llevar a cabo autoconsumo. Se comprobó que los costes de la instalación y de los componentes podrían hacer muy competitivo el precio del kWh generado por un sistema fotovoltaico. El propósito principal de este análisis fue determinar cuál es la combinación de fuentes de generación de energía eléctrica más rentable para ser utilizada en una vivienda, considerando en todos los casos generación fotovoltaica. En la cuarta parte de esta tesis se llevó a cabo un análisis de sensibilidad con el fin de determinar la situación, en España, respecto de la paridad de red para las instalaciones fotovoltaicas, utilizando como parámetros de estudio el LCOE y la TIR. Para ello se consideraron tres instalaciones fotovoltaicas de diferentes tamaños (5, 50 y 500 kW). El objetivo principal fue determinar dónde y cuándo se alcanzará la paridad de red. Los resultados reflejaron que la paridad de red ha sido ya alcanzada en varios de los escenarios considerados. Se aplicó un método de cálculo determinístico y otro probabilístico (técnica de Montecarlo), determinando el punto en el que se alcanza la paridad de red, donde el subsidio tarifario es cero y la TIR es atractiva para los inversores privados. <br /