Complejo Hospitalario Universitario de Santiago
Repositorio Institucional da Universidade de Santiago de CompostelaNot a member yet
32415 research outputs found
Sort by
Evaluating the performance of carbon-based adsorbents fabricated from renewable biomass precursors for post-combustion CO2 capture
Get PDFThe significant increase in atmospheric CO2 concentration originated mainly from fossil fuels combustion has encouraged the development and improvement of CO2 separation operations to reduce emissions and control climate change and global warming. Therefore, this work is focused on the separation of CO2 from N2 in flue gas streams under post-combustion conditions by developing low-cost adsorbents. Six carbons were fabricated from biomass resources (olive stones and almond shells) to assess their influence on CO2 adsorption capacity: One carbonized and two KOH-activated carbons with carbon/KOH ratio of 1:2 and 1:4 (w/w) for each precursor. The carbons were characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), elemental analysis, nitrogen and carbon dioxide adsorption–desorption analysis, X-ray diffraction (XRD), Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS) and point of zero charge determination. In addition, the equilibrium adsorption data of pure components for all adsorbents were measured at 0, 25 and 50 °C between 0 and 760 mmHg and CO2/N2 selectivity was determined. Activated carbons were found to have higher CO2 adsorption capacity but with a reduction in apparent selectivity. Dynamic binary adsorption simulations performed in a fixed-bed column demonstrated that the activated carbon produced from olive stones with a carbon/KOH ratio of 1:4 (w/w) can separate a mixture of 14 % CO2 and 86 % N2 at 25 and 50 °C with the highest selectivity, CO2 adsorption capacity, CO2 purity and N2 recovery factor. Reducing flow rate, the breakthrough time increased. Moreover, the breakthrough time was reduced by increasing the temperature from 25 to 50 °C owing to the exothermic nature of adsorption process.This work is part of I+D+i project Reference PID2021-122923NB-I00 financed by MCIN/AEI /10.13039/501100011033 / FEDER, UE. Authors would like to thank the use of RIAIDT-USC analytical facilities. Authors would also like to thank Dr. Carlos A. Pena and Dr. A. Gil for their helps in performing the kinetic experiments and determining the solid density of carbons, respectively.S
Goodness-of-fit test for point processes first-order intensity
Get PDFModelling the first-order intensity function is one of the main aims in point process theory. An appropriate model describes the first-order intensity as a nonparametric function of spatial covariates. A formal testing procedure is presented to assess the goodness-of-fit of this model, assuming an inhomogeneous Poisson point process. The test is based on a quadratic distance between two kernel intensity estimators. The asymptotic normality of the test statistic is proved and a bootstrap procedure to approximate its distribution is suggested. The proposal is illustrated with two applications to real data sets, and an extensive simulation study to evaluate its finite-sample performance.The authors are grateful for the very constructive comments from the three anonymous reviewers and Associate Editor which helped to improve this manuscript. The authors acknowledge the support through the project PID2020-116587GB-I00 granted by MICIU/AEI/10.13039/501100011033. The authors also acknowledge the Canadian Wildland Fire Information System for their activity in recording and freely providing part of the real data used in this paper.S
Exploring soccer transfers in Spanish League– The hidden role of strategic differences among teams
Get PDFTransfers in the football world have become a hot topic in academic studies in recent years.
Spanish league (La Liga) is one of the men’s professional football leagues that have driven
some of the most notorious transfers. In this way, we test determinants for the transfer relationships of football players in the Spanish League in the most expensive seasons with records (2018/2019 and 2019/2020 seasons). Furthermore, we identify determinants for the
values of the observed transfers. The empirical analysis shows relevant findings. We recognize two implications. First, Spanish soccer transfers are not random and this evidence
reflects the environment of imperfect competition characterizing La Liga. Second, the nonrandomness of the transfer process can be associated with an increasing inequality among
teams and with a threat to the competitive balance in professional sports.The author(s) received no specific funding for this work. The authors have declared that no competing interests exist.S
Il protagonismo femminile nell’ “Elegia di Madonna Fiammetta”: identificazione e analisi delle fonti dell’opera e delle tradizioni letterarie sulle donne durante il periodo napoletano di Giovanni Boccaccio (1327-1340)
Get PDFA presente tese de doutoramento céntrase no estudo da Elegia di Madonna Fiammetta, obra escrita por Giovanni Boccaccio entre 1343-1344, da que se examinarán as fontes que utiliza o autor e o protagonismo da narradora homónima. Fiammetta é unha nobre napolitana que conta a súa historia en primeira persoa e lamenta a perda de Pánfilo, o seu amante. O relato inscríbese na ficción elexíaca e recolle un gran número de fontes da tradición clásica e da tradición medieval. O escritor de Certaldo coñeceu estes textos durante a súa formación na corte anxevina de Nápoles, durante una dilatada estancia (de 1327 a 1340), onde entrou en contacto cos círculos intelectuais da capital napolitana que influíran no proceso compositivo da Elegia
Topology of the space of conormal distributions
Get PDFGiven a closed manifold and a closed regular submanifold , consider the corresponding locally convex space of conormal distributions, with its natural topology, and the strong dual of the space of conormal densities. It is shown that is a barreled, ultrabornological, webbed, Montel, acyclic LF-space, and is a complete Montel space, which is a projective limit of bornological barreled spaces. In the case of codimension one, similar properties and additional descriptions are proved for the subspace of conormal distributions supported in and for its strong dual . We construct a locally convex Hausdoff space and a continuous linear map such that the sequence as well as the transpose sequence are short exact sequences in the category of continuous linear maps between locally convex spaces. Finally, it is shown that in the space of distributions. In another publication, these results are applied to prove a Lefschetz trace formula for a simple foliated flow on a compact foliated manifold . It describes a Lefschetz distribution defined by the induced action on the reduced cohomologies and of the complexes of leafwise currents that are conormal and dual-conormal at the leaves preserved by .AEI/FEDER, e Xunta de Galicia/FEDER.S
Licensing of a new technology by an outside and uninformed licensor
Get PDFWe examine the licensing decision of a non-producer innovator with a new technology that enables the manufacture of a saleable product. The technology is licensed and each user privately knows its innovation-related production cost, whereas the licensor only knows, with a certain probability, that this cost may be low (the user is efficient) or high (the user is inefficient). When a single licence is granted through separating contracts, only the contract intended for the inefficient user involves a per-unit royalty, but when two licences are granted through separating contracts, the contracts intended for the inefficient and efficient users both feature a per-unit royalty. However, screening is less likely as the number of licences increases, to the point that the licensor does not screen users when granting three licences. Additionally, whereas the diffusion of the innovation is socially insufficient under symmetric information, with asymmetric information it may be socially optimal. Finally, when licensing with contracts involving an ad-valorem royalty is also feasible the licensor finds it less attractive than licensing with a per-unit royaltyOpen Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. The authors acknowledge financial aid from Consellería de Cultura, Educación, Formación Profesional e Universidades (Xunta de Galicia) through Grant Consolidación e estruturación – 2023 GRC GI-2016 Análise económica dos mercados e institucións (AEMI). The second author also thanks financial support from the Spanish Ministry of Science and Innovation research project PID2020-118119 GB-I00. They declare that these institutions do not gain or lose financially through publication of this paperS
Preguntas en el contexto académico: número, tipo y calidad de las preguntas que hace el alumnado de enseñanza secundaria cuando lee textos de contenido científico
Get PDFEn esta tesis se estudian las preguntas que hace el alumnado
cuando lee textos de contenido científico. Se incluyen los
resultados de cinco estudios. Los tres primeros se centraron en
el número y tipo de preguntas que hacían los estudiantes y en
el efecto de variables como la expectativa de obtener
respuestas, el nivel de exigencia de la tarea, el nivel del
alumnado o la demanda de la tarea. Los resultados muestran
cómo el alumnado hace buenas preguntas cuando tiene
oportunidad y que muchas de las preguntas que hacen se
dirigen a las relaciones causales.
El cuarto y quinto estudios se centraron en la calidad de las
preguntas, buscando dimensiones o componentes de calidad. Se
analiza en detalle una dimensión: la generalidad, medida en
términos del nivel ontológico de la categoría a la que se dirige
Modificación de los genotipos bacteroidales en pacientes con colitis ulcerosa y su aplicación en la práctica clínica
Get PDFEsta tesis ha profundizado en la relación entre la enfermedad inflamatoria
intestinal (EII) y la microbiota intestinal, con un enfoque específico en el
filo Bacteroidetes. Se ha estructurado en tres partes, un análisis
retrospectivo inicial que incluyó a 52 pacientes con EII, donde se tomaron
muestras de biopsias colónicas; un estudio prospectivo que incluyó a 17
pacientes recién diagnosticados de colitis ulcerosa y 17 individuos sanos
con toma de biopsias colónicas y muestras fecales; y finalmente, un
estudio experimental llevado a cabo en ratones. Durante este estudio, se
ha identificado un genotipo específico denominado C4 que se ha asociado
a la presencia de actividad inflamatoria y hemos creado una sonda de
reconocimiento para su detección.
Assessing conflict of interest reporting and quality of clinical trials on infant formula: a systematic review
Get PDFObjectives: This study aims to assess the quality, risk of bias, and conflicts of interest (COIs) of clinical trials conducted on the effects of fortified infant formula.
Study Design and Settting: Systematic review including all randomized clinical trials targeting healthy children and using three arms: fortified infant formula; standard formula; and breastfeeding. We performed a descriptive analysis of the studies reviewed, assessed their quality using the “Risk of Bias 2- RoB 2” tool, and identified COIs.
Results: A total of 40 studies were included. All showed a high overall risk of bias, with this being especially noteworthy in the “deviations from intention to treat” and “missing outcome data” domains. Of the total included studies, 29 reported conclusions in favor of the fortified formula; 15 studies reported multiple conclusions that were either contradictory or not in line with the results. COIs with industry were identified in 33 studies, and in 17 studies, these conflicts were not declared in the appropriate section.
Conclusion: From a methodological perspective, studies on fortified infant formula display low quality, made evident by the high risk of bias. Additionally, there are frequent COIs. These aspects must be considered by health professionals and the population when drawing up recommendations for the use of this productS
El equilibrio sagital en la espondilolistesis degenerativa L4-L5: patogénia, estudio de parámetros espinopélvicos y de los mecanismos de compensación
Get PDFLa espondilolistesis degenerativa (ED) es una inestabilidad de
un nivel vertebral. Provoca el desplazamiento ventral de
todo el tronco proximal a la lesión, originando a la vez una
estenosis de canal y una desalineación del raquis que puede
conducir a un desequilibrio. Existe un reclutamiento de
mecanismos compensadores para evitar esto último, tanto a
nivel
de la columna lumbar (con hiperextensión de segmentos
craneales a la listesis) como de la pelvis: en forma de
retroversión. Estos mecanismos tendrán mayor o menor
preponderancia dependiendo de su “flexibilidad” y puede venir
determinada por la morfología de la unión lumbopélvic