University of Extremadura

About: University of Extremadura is a education organization based out in Badajoz, Spain. It is known for research contribution in the topics: Population & Hyperspectral imaging. The organization has 7856 authors who have published 18299 publications receiving 396126 citations. The organization is also known as: Universidad de Extremadura.

Understanding the carbonation of concrete with supplementary cementitious materials: a critical review by RILEM TC 281-CCC

Abstract: Blended cements, where Portland cement clinker is partially replaced by supplementary cementitious materials (SCMs), provide the most feasible route for reducing carbon dioxide emissions associated with concrete production. However, lowering the clinker content can lead to an increasing risk of neutralisation of the concrete pore solution and potential reinforcement corrosion due to carbonation. carbonation of concrete with SCMs differs from carbonation of concrete solely based on Portland cement (PC). This is a consequence of the differences in the hydrate phase assemblage and pore solution chemistry, as well as the pore structure and transport properties, when varying the binder composition, age and curing conditions of the concretes. The carbonation mechanism and kinetics also depend on the saturation degree of the concrete and CO2 partial pressure which in turn depends on exposure conditions (e.g. relative humidity, volume, and duration of water in contact with the concrete surface and temperature conditions). This in turn influence the microstructural changes identified upon carbonation. This literature review, prepared by members of RILEM technical committee 281-CCC carbonation of concrete with supplementary cementitious materials, working groups 1 and 2, elucidates the effect of numerous SCM characteristics, exposure environments and curing conditions on the carbonation mechanism, kinetics and structural alterations in cementitious systems containing SCMs.

Cognitive performance and quality of life in bipolar disorder.

Abstract: Objective:In patients with bipolar disorder (BD), quality of life (QOL) scores have been largely attributed to mood symptoms. However, impairments in QOL may occur even in euthymia, and differentia...

Visualization of the challenges and limitations of the long-term sunspot number record

Abstract: The solar cycle periodically reshapes the magnetic structure and radiative output of the Sun and determines its impact on the heliosphere roughly every 11 years. Besides this main periodicity, it shows century-long variations (including periods of abnormally low solar activity called grand minima). The Maunder Minimum (1645–1715) has generated significant interest as the archetype of a grand minimum in magnetic activity for the Sun and other stars, suggesting a potential link between the Sun and changes in terrestrial climate. Recent reanalyses of sunspot observations have yielded a conflicted view on the evolution of solar activity during the past 400 years (a steady increase versus a constant level). This has ignited a concerted community-wide effort to understand the depth of the Maunder Minimum and the subsequent secular evolution of solar activity. The goal of this Perspective is to review recent work that uses historical data to estimate long-term solar variability, and to provide context to users of these estimates that may not be aware of their limitations. We propose a clear visual guide than can be used to easily assess observational coverage for different periods, as well as the level of disagreement between currently proposed sunspot group number series. The sunspot number time series is an essential tool to determine the secular variations of solar activity, but particular care must be taken to handle and present incomplete temporal coverage. The authors present the current state of research and propose a new way to visualize long-term solar activity data.

Análisis pormenorizado de los grados de burnout y técnicas de afrontamiento del estrés docente en profesorado universitario

Abstract: In this study the different degrees of burnout and stress-management techniques are compared. The aim is to see if there is a relation between the levels of burnout and the different stress-management techniques which are adopted by teachers. Maslach’s Inventory (Maslach and Jackson, 1986) or M.B.I. and the evaluation scale of stressmanagement or C.O.P.E. (Carver, Scheier and Weintraub, 1989) were used in the study. Certain results show that teachers who suffer from a high degree of emotional exhaustion use techniques involving emotional unburdening, behavioural disconnection, drug-taking and acceptance of the situation (passive techniques) On the other hand, those teachers who show a high degree of personal attainment use techniques involving active confrontation, planning, seeking instrumental and social help, having a positive view of the situation and decreasing confrontational situations (active techniques)