40 research outputs found

    Modelos de cálculo de costes y emisiones de CO2 para la electricidad solar PV y CSP según diversos escenarios (2010-2050)

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    Tesis doctoral inédita, leída en la Universidad Autónoma de Madrid. Facultad de Ciencias. Programa de Doctorado Energías y Combustibles para el Futuro. Fecha de lectura: 22-11-201

    Commentary: Photovoltaics firmly moving to the terawatt scale

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    Martínez-Duart, J.M., Hernández-Moro, J., "Commentary: Photovoltaics firmly moving to the terawatt scale", Journal of Nanophotonics, Society of Photo Optical Instrumentation Engineers, 7(1), 078599, (2013). Copyright The Authors 2014 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibite

    Cronius ruber (Lamarck, 1818), un nuevo decápodo en los fondos someros de Canarias

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    Estudio observacional sobre la llegada y el estado actual de las poblaciones del cangrejo decápodo pantropical Cronius ruber (Lamarck, 1818) en la isla de Tenerife. Se trata de una especie de la familia Portunidae, cuyos primeros registros publicados en Canarias se producen en el año 2017, siendo citada por primera vez en el litoral de Tenerife en el año 2018; aunque por la información recabada para este trabajo, los primeros registros de la presencia de esta especie en Tenerife se remontan al año 2008. Se trata de una especie neocolonizadora a tener en cuenta por su potencialidad invasora en los archipiélagos de Madeira y Canarias. Su aparición en las Islas ha sido relacionada principalmente con el intenso transporte marítimo entre Canarias y África occidental; sin embargo, no podemos descartar una expansión natural de sus poblaciones relacionada con el calentamiento reciente de las aguas de Canarias, propicias para el establecimiento de especies tropicales. Con este estudio pretendemos además definir el nicho ecológico ocupado por C. ruber y valorar de manera cualitativa el grado de competencia con otras especies de crustáceos decápodos nativos presentes en el litoral de Canarias.Observational study about the arrival and the actual status of the populations of the pantropical decapod crab Cronius ruber (Lamarck, 1818) in the island of Tenerife. It is a species of the family Portunidae, whose first records in the Canary Islands were published in 2017, being cited for the first time on the coast of Tenerife in 2018. Although due to the information collected in this work, the first records of the presence of this species in Tenerife date back to 2008. It is a neocolonizer specie and a very important one because of its potential to act as an invasive species in the archipelagos of Madeira and the Canary Islands. Its arrival to the islands have been related with the intense maritime transports between the Canaries and occidental Africa. However, we cannot be ruled out a natural expansion of its populations related with the recent water warming of the Canaries, favorable to the establishment of tropical species. With this study, we aim to define the ecological niche occupied by C. ruber and to qualitative assess the degree of competition with other species of native decapods crustaceans present on the Canary littoral

    Differences in n-type doping efficiency between Al- and Ga-ZnO films

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    A careful and wide comparison between Al and Ga as substitutional dopants in the ZnO wurtzite structure is presented. Both cations behave as n-type dopants and their inclusion improves the optical and electrical properties of the ZnO matrix, making it more transparent in the visible range and rising up its electrical conductivity. However, the same dopant/Zn ratio leads to a very different doping efficiency when comparing Al and Ga, being the Ga cation a more effective dopant of the ZnO film. The measured differences between Al- and Ga-doped films are explained with the hypothesis that different quantities of these dopant cations are able to enter substitutionally in the ZnO matrix. Ga cations seem to behave as perfect substitutional dopants, while Al cation might occupy either substitutional or interstitial sites. Moreover, the subsequent charge balance after doping appear to be related with the formation of different intrinsic defects that depends on the dopant cation. The knowledge of the doped-ZnO films microstructure is a crucial step to optimize the deposition of transparent conducting electrodes for solar cells, displays, and other photoelectronic devices.Ministerio de Ciencia e Innovación TEC2007-60996, MAT2008-06858-C02-02, MAT2008- 06330, TEC2010-16700FUNCOAT CSD2008-00023- CONSOLIDER INGENIOSonderforschungsbereich SFB 76

    Prevalence of Musculoskeletal Post-COVID Pain in Hospitalized COVID-19 Survivors Depending on Infection with the Historical, Alpha or Delta SARS-CoV-2 Variant

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    We compared the prevalence of musculoskeletal post-COVID pain between previously hospitalized COVID-19 survivors infected with the historical, Alpha or Delta SARS-CoV-2 variant. Data about musculoskeletal post-COVID pain were systematically collected through a telephone interview involving 201 patients who had survived the historical variant, 211 who had survived the Alpha variant and 202 who had survived the Delta variant six months after hospital discharge. Participants were recruited from non-vaccinated individuals hospitalized due to SARS-CoV-2 infection in one hospital of Madrid (Spain) during three different waves of the pandemic (historical, Alpha or Delta variant). Hospitalization and clinical data were collected from hospital medical records. In addition, anxiety/depressive levels and sleep quality were also assessed. The prevalence of musculoskeletal post-COVID pain was higher (p = 0.003) in patients infected with the historical variant (47.7%) than in those infected with the Alpha (38.3%) or Delta (41%) variants. A significantly (p = 0.002) higher proportion of individuals infected with the historical variant reported generalized pain (20.5%) when compared with those infected with the other variants. The prevalence of new-onset post-COVID musculoskeletal pain reached 80.1%, 75.2% and 79.5% of patients infected with the historical, Alpha or Delta variants, respectively. No specific risk factors for developing post-COVID pain were identified depending on the SARS-CoV-2 variant. In conclusion, this study found that musculoskeletal post-COVID pain is highly prevalent in COVID-19 survivors six months after hospital discharge, with the highest prevalence and most generalized pain symptoms in individuals infected with the historical variant. Approximately 50% developed “de novo” post-COVID musculoskeletal pain symptoms

    Clonal chromosomal mosaicism and loss of chromosome Y in elderly men increase vulnerability for SARS-CoV-2

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    The pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2, COVID-19) had an estimated overall case fatality ratio of 1.38% (pre-vaccination), being 53% higher in males and increasing exponentially with age. Among 9578 individuals diagnosed with COVID-19 in the SCOURGE study, we found 133 cases (1.42%) with detectable clonal mosaicism for chromosome alterations (mCA) and 226 males (5.08%) with acquired loss of chromosome Y (LOY). Individuals with clonal mosaic events (mCA and/or LOY) showed a 54% increase in the risk of COVID-19 lethality. LOY is associated with transcriptomic biomarkers of immune dysfunction, pro-coagulation activity and cardiovascular risk. Interferon-induced genes involved in the initial immune response to SARS-CoV-2 are also down-regulated in LOY. Thus, mCA and LOY underlie at least part of the sex-biased severity and mortality of COVID-19 in aging patients. Given its potential therapeutic and prognostic relevance, evaluation of clonal mosaicism should be implemented as biomarker of COVID-19 severity in elderly people. Among 9578 individuals diagnosed with COVID-19 in the SCOURGE study, individuals with clonal mosaic events (clonal mosaicism for chromosome alterations and/or loss of chromosome Y) showed an increased risk of COVID-19 lethality
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