jueves, 2 de junio de 2022

Studygrammers: Learning influencers

Today's learning ecologies stand out due to their variety, dynamism and mutability, demanding an observation that matches them. This paper focuses on emerging youth informal learning cultures, with the main objective of recognizing and characterizing a new figure in online social media: the studygrammer. Using questionnaires (N=256), discussion groups organized using Philips 66 (N=56) and Atlas. ti (thematic analysis), as well as participant observation, we analyzed: practices of academic use of social networks by Communication students outside the institutional environment, the opinion about the #Studygram community, and the analysis of profiles. The main results are centered on a proposed definition of the studygrammer: namely the student who works as a mentor and peer leader in Instagram's academic field. This profile not only shares notes (which stand out for their neatness and detailed aesthetics), but also conveys advice, support and experiences. In fact, studygrammers keep influencer genetics by prioritizing aesthetics and monetization in their publications. The conclusion is that the academic purpose adds exclusive characteristics to the community, where the visual code functions as a lingua franca between fields of study. In fact, studygrammers have followers from various academic backgrounds who seek "know-how" (management and planning of their own learning) as well as a fundamentally rational adherence.

Efficacy and harms of remdesivir for the treatment of COVID-19: A systematic review and meta-analysis

Background Efficacy and safety of treatments for hospitalized COVID-19 are uncertain. We systematically reviewed efficacy and safety of remdesivir for the treatment of COVID-19. Methods Studies evaluating remdesivir in adults with hospitalized COVID-19 were searched in several engines until August 21, 2020. Primary outcomes included all-cause mortality, clinical improvement or recovery, need for invasive ventilation, and serious adverse events (SAEs). Inverse variance random effects meta-analyses were performed. Results We included four randomized controlled trials (RCTs) (n = 2296) [two vs. placebo (n = 1299) and two comparing 5-day vs. 10-day regimens (n = 997)], and two case series (n = 88). Studies used intravenous remdesivir 200mg the first day and 100mg for four or nine more days. One RCT (n = 236) was stopped early due to AEs; the other three RCTs reported outcomes between 11 and 15 days. Time to recovery was decreased by 4 days with remdesivir vs. placebo in one RCT (n = 1063), and by 0.8 days with 5-days vs. 10-days of therapy in another RCT (n = 397). Clinical improvement was better for 5-days regimen vs. standard of care in one RCT (n = 600). Remdesivir did not decrease all-cause mortality (RR 0.71, 95% CI 0.39 to 1.28, I2 = 43%) and need for invasive ventilation (RR 0.57, 95%CI 0.23 to 1.42, I2 = 60%) vs. placebo at 14 days but had fewer SAEs; 5-day decreased need for invasive ventilation and SAEs vs. 10-day in one RCT (n = 397). No differences in all-cause mortality or SAEs were seen among 5-day, 10-day and standard of care. There were some concerns of bias to high risk of bias in RCTs. Heterogeneity between studies could be due to different severities of disease, days of therapy before outcome determination, and how ordinal data was analyzed. Conclusions There is paucity of adequately powered and fully reported RCTs evaluating effects of remdesivir in hospitalized COVID-19 patients. Until stronger evidence emerges, we cannot conclude that remdesivir is efficacious for treating COVID-19.

Análisis bibliométrico de la producción científica latinoamericana sobre COVID-19 / Bibliometric evaluation of Latin American contributions on COVID-19

viernes, 27 de mayo de 2022

Effects of waste glass powder as pozzolanic cement supplementary material for structural elements

The ever-growing global production of glass generates high waste percentages, the vast majority of which does not get recycled hence increasing the concern on its environmental impact. Studies on the pozzolanic properties of glass powder emerged as a solution to the abundance of waste glass powder available and its insufficient recycling. The aim of this study is to investigate the influence 10%,15% and 20% of waste soda-lime glass powder as partial cement replacement; fresh concrete tests were carried out, as well as compression strength tests at 28 days on grade 280 kg/cm2 concrete produced with pozzolanic cement. Tests results show an insignificant reduction of slump on the concrete mixes, an increase of air content and a decrease in density and compressive strength resistance with increasing glass powder substitution. 

Editorial: Trans Tech Publications Ltd
Journal: Materials Science Forum
DOI: http://doi.org/10.4028/p-4vq485
Enlaces adicionales: https://www.scientific.net/MSF.1058.127

martes, 24 de mayo de 2022

Análisis bibliométrico de la producción científica latinoamericana sobre COVID-19

Resumen: 

Introducción. La propagación de la COVID-19, una enfermedad infecciosa causada por el nuevo coronavirus SARS-CoV-2, se ha convertido en una pandemia que, a la par de su rápida diseminación a nivel mundial, ha traído consigo un aumento exponencial de la cantidad de estudios relacionados con el tema, fenómeno en el que los investigadores de Latinoamérica han participado activamente. 

Objetivo. Llevar a cabo un estudio bibliométrico descriptivo para identificar las tendencias de la investigación sobre COVID-19 producida en Latinoamérica. Materiales y métodos. Se recurrió a las bases de datos Web of Science, Scopus y Pubmed para recuperar la producción científica latinoamericana sobre COVID-19. Se analizaron los indicadores bibliométricos de producción, visibilidad, impacto y colaboración para evaluar la participación regional en la investigación sobre el tema. 

Resultados. El análisis de 142 documentos evidenció un crecimiento exponencial de la producción científica en el corto periodo analizado, una significativa colaboración internacional (51,4 %), y el liderazgo de las instituciones regionales (71 %) en la investigación con aportes en revistas de alta visibilidad, especialmente de Colombia, Brasil y México. Conclusiones. El estudio evidenció resultados relevantes sobre la participación regional en la investigación sobre COVID-19, no solo en cuanto a la cantidad y el crecimiento exponencial, sino también a su calidad y excelencia, con una elevada tasa de colaboración internacional y de publicación en revistas de reconocido prestigio, lo que, además de ser clave para la visibilidad de los países, es un considerable aporte a las investigaciones que se realizan en otros contextos geográficos.


Journal: Biomédica

DOI: https://doi.org/10.7705/biomedica.5571

URL: http://hdl.handle.net/10757/652160

Fecha: 2020-05-28