Search results for " relat"
showing 10 items of 15512 documents
A model of degassing for Stromboli volcano
2010
International audience; A better understanding of degassing processes at open-vent basaltic volcanoes requires collection of new datasets of H2O–CO2–SO2 volcanic gas plume compositions, which acquisition has long been hampered by technical limitations. Here, we use the MultiGAS technique to provide the best-documented record of gas plume discharges from Stromboli volcano to date. We show that Stromboli's gases are dominated by H2O (48–98 mol%; mean, 80%), and by CO2 (2–50 mol%; mean, 17%) and SO2 (0.2–14 mol%; mean, 3%). The significant temporal variability in our dataset reflects the dynamic nature of degassing process during Strombolian activity; which we explore by interpreting our gas m…
Sulfur Degassing From Steam-Heated Crater Lakes: El Chichón (Chiapas, Mexico) and Víti (Iceland)
2018
The composition of the gases released by El Chichón (Chiapas, Mexico) and Víti (Askja volcano, Iceland) volcanic lakes is examined by Multi-GAS for the first time. Our results demonstrate that H2S and SO2 are degassed by these pH 2–3 lakes. We find higher CO2/H2S and H2/H2S ratios in the lakes' emissions (31–5,685 and 0.6–35, respectively) than in the fumarolic gases feeding the lakes (13–33 and 0.08–0.5, respectively), evidencing that only a fraction (0.2–5.4% at El Chichón) of the H2S(g) contributed by the subaquatic fumaroles ultimately reaches the atmosphere. At El Chichón, we estimate a H2S output from the crater lake of 0.02–0.06 t/day. Curiously, SO2 is also detected at trace levels …
Volcanic Plume CO2 Flux Measurements at Mount Etna by Mobile Differential Absorption Lidar
2017
Volcanic eruptions are often preceded by precursory increases in the volcanic carbon dioxide (CO2) flux. Unfortunately, the traditional techniques used to measure volcanic CO2 require near-vent, in situ plume measurements that are potentially hazardous for operators and expose instruments to extreme conditions. To overcome these limitations, the project BRIDGE (BRIDging the gap between Gas Emissions and geophysical observations at active volcanoes) received funding from the European Research Council, with the objective to develop a new generation of volcanic gas sensing instruments, including a novel DIAL-Lidar (Differential Absorption Light Detection and Ranging) for remote (e.g., distal) …
Ultraviolet imaging of volcanic plumes: A new paradigm in volcanology
2017
Ultraviolet imaging has been applied in volcanology over the last ten years or so. This provides considerably higher temporal and spatial resolution volcanic gas emission rate data than available previously, enabling the volcanology community to investigate a range of far faster plume degassing processes than achievable hitherto. To date, this has covered rapid oscillations in passive degassing through conduits and lava lakes, as well as puffing and explosions, facilitating exciting connections to be made for the first time between previously rather separate sub-disciplines of volcanology. Firstly, there has been corroboration between geophysical and degassing datasets at â1 Hz, expeditin…
Evolution of Seismicity During a Stalled Episode of Reawakening at Cayambe Volcano, Ecuador
2021
Cayambe Volcano is an ice-capped, 5,790 m high, andesitic-dacitic volcanic complex, located on the equator in the Eastern Cordillera of the Ecuadorian Andes. An eruption at Cayambe would pose considerable hazards to surrounding communities and a nationally significant agricultural industry. Although the only historically documented eruption was in 1785, it remains persistently restless and long-period (LP) seismicity has been consistently observed at the volcano for over 10 years. However, the sparse monitoring network, and complex interactions between the magmatic, hydrothermal, glacial, and tectonic systems, make unrest at Cayambe challenging to interpret. In June 2016 a seismic “crisis” …
Vulnerabilità sulla scena. Temi etici e soluzioni drammaturgiche nella "Medea" di Seneca
2018
La Medea di Seneca racconta una storia di vulnerabilità? Questo saggio propone una lettura della tragedia usando il concetto di vulnerabilità non come criterio per verificare la correttezza degli assunti stoici in materia di condotta morale, ma quale paradigma di relazione tra soggetti che, per definirsi, si consegnano gli uni agli altri, esponendosi, e su tale esposizione mettono alla prova l’identità personale e la fallibilità dell’autonomia morale. In questa idea di vulnerabilità non si trova solo una lente per formulare domande di natura etica, ma anche un utile strumento di analisi del meccanismo drammaturgico senecano. Is Seneca’s Medea a story of vulnerability? This paper aims to rea…
Focusing on Workplace Communication
2019
Communication has a constitutive role in the workplace; in workplace communication the organization comes into being. In workplace communication workers create and negotiate meanings and a shared understanding of important work-related issues. Communication is also essential for a functional working environment. Especially in knowledge-based work members of the workplace aim at success, efficiency, and productivity by discussing, conversing, debating, and providing and receiving feedback. Hence, when striving to establish a healthy workplace with high levels of satisfaction and well-being, one has to understand the dynamics of workplace communication. This chapter examines interpersonal com…
Qualitative case study of Congolese children's current friendships in Finland and past experiences as refugees in Rwanda, 1996-2012
2013
Tutkijat ovat osoittaneet, että sosiaalisen tuen sekä vuorovaikutus- ja vertaissuhteiden merkityksestä sodasta kärsineiden lasten elämässä tarvitaan lisätutkimusta. Oheinen kvalitatiivinen tapaustutkimus pienentää tätä puutetta aiemmassa tutkimuksessa tarjoamalla lisätietoa kongolaisten pakolaislasten interpersoonallisista vuorovaikutussuhteista ystävien kanssa Suomeen muuton jälkeisessä tilanteessa. Katsottaessa identiteettien muodostusta ja kulttuurien luomista ilmiöinä, näiden neuvottelujen nähdään tapahtuvan ihmisten välisessä vuorovaikutuksessa. Tästä näkökulmasta katsottuna oheinen poikkitieteellinen tutkimus ottaa huomioon myös näiden neuvotteluiden historiallisen kontekstin. Monimut…
Perceived status and value
2017
This article examines how students in a multidisciplinary project-based learning course involving real customers perceive their interactions with their customers. The authors conducted a qualitative study and analysed students’ learning reports by means of a thematic network analysis. The analysis shows how students perceive their status in relation to their customers and how their perceptions of their work affect how they see the value of the projects. The authors consider their empirical findings in the context of the existing literature on university–industry collaboration and thereby summarize different scenarios of the contrasting working practices and priorities in academia and indus…