Modulating heterointerfaces of tungsten incorporated CoSe2/Co3O4 as highly efficient electrocatalyst for overall water splitting

Electrochemical water-splitting is rising as the promised pathway to produce pure and green hydrogen. However, the sluggish kinetics of the oxygen evolution reaction (OER) and slow reaction rate of hydrogen...

What would be another word for it?

This is the score for a performed talk called ‘What would be another word for it?’, which is about practice, but also about the difficulty of describing the experience of practicing. It was written for a Stockholm series curated by Chrysa Parkinson, and was kind of a conversation with a video on practice she’d made some years before. At the time of writing I’d also started playing English folk music with a concertina player called Will Duke, who was making me re-think what music and dance practice might be. Both of these people are mentioned in the text. The second time I gave the talk I thought it should be more physical, so I memorized the words until the rhythm was in my body. This is also a practice that Chrysa Parkinson uses in her talks. Throughout the memorized performance I started and stopped a slow-motion projection of the dancer Katye Coe, altered by the filmmaker Hugo Glendinning so that Katye seemed to hover always on the edge of stopping, and the faces of the people watching were frozen in slow reaction. And between segments of speaking, I played a small button accordion and a harmonica, both instruments I practice every day. The button accordion is not an instrument usually associated with improvised contemporary dance, and I enjoyed how the connection between the film and my music was in the practice and not in the style. You will see that the score has marks indicating when I should start and stop the film, and when I should start and stop the music. Many dancers describe the way they vocalize while moving, making something like a low grunting sound, too quiet to be heard. If this text is choreographic, then it’s something to do with that kind of grunting, which is a feeling connected to rhythm and emphasis, and also to a sense of reaching out, from here to there.

The importance of the time response of Electrochemical Concentration Cell (ECC) ozone sondes for measurements of tropical upper tropospheric and lower stratospheric ozone

<p>Accurate measurements of ozone in the upper tropical troposphere and lower stratosphere (UTLS) are challenging for most measuring systems, yet of great importance for the understanding of the chemical and dynamical processes in this region.</p><p>Balloon-borne observations using Electrochemical Concentration Cell (ECC) ozone sondes are the most widely used in situ technology to measure vertical profiles of ozone in networks such as the Southern Hemisphere ADditional Ozonesondes (SHADOZ) network of tropical and subtropical ozone sonde stations.</p><p>The tropical upper troposphere and the layers of near-zero ozone within the ozone hole are most sensitive to processing and preparation variations that may affect the accuracy and possibly trend estimates of ozone in low ozone regions. It is now appreciated that the complex chemistry within the ECC used to detect ozone exhibits two different time constants (τ<sub>fast</sub>≈20 s, τ<sub>slow</sub>≈25 min), which modify the response of the ECC during a profile. Although not well understood, the chemistry of the slow reaction is likely to represent what has conventionally been assumed a constant “background current”. The fast reaction causes some delay in the response of the ECC to changes in the vertical profile of ozone. Here we show how correcting for both improves the estimate of the lowest ozone concentration in the upper troposphere as well as the steepness of the gradient in the transition into the stratosphere. The steady state bias, which describes the contribution of the slow reaction, is the largest source of uncertainty overall; the response time of the fast reaction dominates the uncertainty in the region of the sharp gradient of ozone above the tropopause.</p>

Motores de la emigración venezolana a España 1998-2015: logros de una estrategia de reproducción social

This article focuses on the profile and satisfaction level of the migration project of the Venezuelan community that arrived in Spain between 1998 and 2015. The empirical analysis of a survey conducted to 383 Venezuelans illustrates the expulsion factors that activated emigration, the achievement of the expectations, and the integration in the country of destination, focusing on the theory of social reproduction as an emigration strategy. This first stage of migration marks the slow reaction of Spanish authorities to the arrival of a significant number of migrants as of 2016.

Rapid Degradation of Carbon Tetrachloride by Microscale Ag/Fe Bimetallic Particles

Cost-effective zero valent iron (ZVI)-based bimetallic particles are a novel and promising technology for contaminant removal. The objective of this study was to evaluate the effectiveness of CCl4 removal from aqueous solution using microscale Ag/Fe bimetallic particles which were prepared by depositing Ag on millimeter-scale sponge ZVI particles. Kinetics of CCl4 degradation, the effect of Ag loading, the Ag/Fe dosage, initial solution pH, and humic acid on degradation efficiency were investigated. Ag deposited on ZVI promoted the CCl4 degradation efficiency and rate. The CCl4 degradation resulted from the indirect catalytic reduction of absorbed atomic hydrogen and the direct reduction on the ZVI surface. The CCl4 degradation by Ag/Fe particles was divided into slow reaction stage and accelerated reaction stage, and both stages were in accordance with the pseudo-first-order reaction kinetics. The degradation rate of CCl4 in the accelerated reaction stage was 2.29–5.57-fold faster than that in the slow reaction stage. The maximum degradation efficiency was obtained for 0.2 wt.% Ag loading. The degradation efficiency increased with increasing Ag/Fe dosage. The optimal pH for CCl4 degradation by Ag/Fe was about 6. The presence of humic acid had an adverse effect on CCl4 removal.

Gobernanza anticipatoria y proactividad administrativa: las virtudes de la descentralización

LABURPENA: COVID-19 krisiak agerian utzi du maila anitzeko gure Gobernantzak ez duela aurrea hartzeko gaitasunik, maila zentraletik berandu erantzun delako. Denontzat neurri berak ezarri ordez metodologia deszentralizatuago batean oinarrituz gero, agertokien definizio estrategikoko zientziak iradokitzen duen ildoari jarraikiz, erabaki egokiagoak hartuko ziren. ABSTRACT: The COVID-19 crisis has revealed the lack of capacity to anticipate of our multilevel governance, due to a slow reaction of central power. A more decentralized and not «one size fits all» decision-making methodology could have been smarter, as suggested by the state of science of strategic scenario definition. RESUMEN: La crisis COVID-19 ha puesto en evidencia la falta de capacidad de anticipación de nuestra gobernanza multinivel, por una tardía respuesta desde el nivel central. Una metodología más descentralizada y sin soluciones de «talla única» hubiera sido más apropiada en la toma de decisiones, en la línea sugerida por la ciencia de definición estratégica de escenarios.

Social and Political Development Strategies: Global Pandemic Challenges (Covid-19)

Even English historian A. Toynbee claimed that each new generation of the “creative minority” (elite) periodically faced challenges of the time, to which it had to seek and give an adequate response. In case of an unsatisfactory answer, this “creative minority” should leave the historical stage, giving way to the more competent elite. The coronavirus crisis experienced by the global community in 2020 has become such a global challenge of our time for many people. And the public can make conclusions about the professional training and level of competence of the ruling elite groups judging from how effectively they cope with this challenge. But even now it can already be stated that the crisis has revealed a number of significant systemic failures in the functioning of political elites - their slow reaction to the event, disunity, clip consciousness and underestimation of the degree of risk, resources and their own capabilities. This article is devoted to the analysis of all these problems.