Synthesis and electrochemical properties of Ti-Si alloys prepared by mechanical alloying and heat treatment

The aim of this work was to study the synthesis and electrochemical properties of Ti 2 wt %-Si alloys prepared by mechanical alloying (MA) and heat treatment. The MA process was performed under Ar atmosphere. The structural, morphological, and compositional evolutions during the milling and subsequent heat treatment were investigated by X-ray diffraction, energy-dispersive spectroscopy, and scanning electron microscopy. The electrochemical behavior was evaluated by open circuit potential and linear sweep voltammetry measurements. The results showed that the MA process promotes the formation of a supersaturated α-Ti-Si solid solution. During heat treatment, the Si remaining in the mechanically alloyed powders and the Si from the α-Ti-Si supersaturated solid solution reacted with Ti to form Ti-Si intermetallic compounds. These compounds have a fine and homogeneous distribution in the α-Ti matrix, which cannot be achieved by conventional casting methods. Additionally, the electrochemical evaluations revealed that the mechanically alloyed and heat-treated Ti 2 wt %-Si powders have better corrosion resistance in 1.63 M H2SO4 than the pure Ti and MA Ti-Si samples. This is likely due to the particular microstructure produced during the milling and subsequent heat treatment

Izaña Atmospheric Research Center. Activity Report 2019-2020

Editors: Emilio Cuevas, Celia Milford and Oksana Tarasova.[EN]The Izaña Atmospheric Research Center (IARC), which is part of the State Meteorological Agency of Spain (AEMET), is a site of excellence in atmospheric science. It manages four observatories in Tenerife including the high altitude Izaña Atmospheric Observatory. The Izaña Atmospheric Observatory was inaugurated in 1916 and since that date has carried out uninterrupted meteorological and climatological observations, contributing towards a unique 100-year record in 2016. This reports are a summary of the many activities at the Izaña Atmospheric Research Center to the broader community. The combination of operational activities, research and development in state-of-the-art measurement techniques, calibration and validation and international cooperation encompass the vision of WMO to provide world leadership in expertise and international cooperation in weather, climate, hydrology and related environmental issues.[ES]El Centro de Investigación Atmosférica de Izaña (CIAI), que forma parte de la Agencia Estatal de Meteorología de España (AEMET), representa un centro de excelencia en ciencias atmosféricas. Gestiona cuatro observatorios en Tenerife, incluido el Observatorio de Izaña de gran altitud, inaugurado en 1916 y que desde entonces ha realizado observaciones meteorológicas y climatológicas ininterrumpidas y se ha convertido en una estación centenaria de la OMM. Estos informes resumen las múltiples actividades llevadas a cabo por el Centro de Investigación Atmosférica de Izaña. El liderazgo del Centro en materia de investigación y desarrollo con respecto a las técnicas de medición, calibración y validación de última generación, así como la cooperación internacional, le han otorgado una reputación sobresaliente en lo que se refiere al tiempo, el clima, la hidrología y otros temas ambientales afines

Intravitreal bevacizumab in diabetic retinopathy. Recommendations from the Pan-American Collaborative Retina Study Group (PACORES): The 2016 knobloch lecture

The advent of intravitreal anti-vascular endothelial growth factor (anti-VEGF) medications has revolutionized the treatment of diabetic eye diseases. Herein, we report the outcomes of clinical studies carried out by the Pan-American Collaborative Retina Study Group (PACORES), with a specific focus on the efficacy of intravitreal bevacizumab in the management of diabetic macular edema and proliferative diabetic retinopathy. We will also discuss the use of intravitreal bevaci-zumab as a preoperative, adjuvant therapy before vitrectomy for prolif-erative diabetic retinopathy. Copyright © 2017 by Asia Pacific Academy of Ophthalmology

Niveles de evidencia y grados de recomendación en kinesiología; una comparación entre cinco sistemas de clasificación: estudio piloto

Objective: To evaluate which of the five classification systems is simpler to understand a Physical therapy evidence levels and grades of recommendation Design: Randomized controlled trial, pilot study. Participants: Physical therapy dedicated to musculoskeletal rehabilitation. Intervention: Case report describing a female patient diagnosed with mild osteoarthritis of the right knee, a specific Medline search was performed to answer the following question: Can therapeutic ultrasound reduce pain and improve physical function? A systematic review that answers the question was not found. The same evidence was presented differently according to the following categories of evidence: NICE, SIGN, GRADE, EMBC and CTPHC. Results: 8 therapists agreed to participate. A GRADE 87.5 % considered the simplest classification compared to 12.5 % (other systems), with a RR = 7.0 (1.090, 95% CI 44.6) and Risk Difference DR = 75 % (42.59, 95% CI 107.4). To see the association showing the relationship between the exposed and unexposed GRADE classification system was used Chi2 statistical Mantel-Haenszel, with a value p = 8.438. Conclusion: Apparently GRADE is the most simple for therapists to understand how scientific evidence.Objetivo: evaluar cuál de los cinco sistemas de clasificación resulta más simple para que un kinesiólogo pueda entender los niveles de evidencia y grados de recomendación. Diseño: estudio clínico aleatorizado, estudio piloto. Participantes: kinesiólogos dedicados a la rehabilitación traumatológica. Intervención: caso clínico que describía a una paciente con diagnóstico de artrosis leve de rodilla derecha. Se realiza una búsqueda específica en Medline para responder la siguiente pregunta: ¿puede el ultrasonido terapéutico disminuir el dolor y mejorar la función física? Se encontró una revisión sistemática que responde a la pregunta. La misma evidencia fue presentada de diferente forma según las siguientes clasificaciones de evidencia: NICE, SIGN, GRADE, CEBM y CTPHC. Resultados: aceptaron participar ocho kinesiólogos. Un 87,5% consideró GRADE la clasificación más simple en comparación con un 12,5% (otros sistemas), presentando un RR = 7,0 (1.090, 44,6 IC95%) y una Diferencia de Riesgo (DR) = 75% (42.59, 107,4 IC95%). Para ver la asociación que presenta la relación entre los expuestos y no expuestos al sistema de clasificación GRADE se utilizó el estadístico Chi2 de Mantel-Haenszel, que presentó un valor p = 8.438. Conclusión: al parecer GRADE es la forma más simple para que los kinesiólogos puedan entender la evidencia científica

Innovación para el desarrollo de nueva propuesta de máster semipresencial en prevención de riesgos laborales

Congreso Universitario de Innovación Educativa En las Enseñanzas Técnicas, CUIEET (26º. 2018. Gijón