2,943 research outputs found
Fiction As Social Inquiry
Full text linkIn this keynote from the 2021 Research Methods e-Festival, Dr Ash Watson traces some of the many forms fiction takes within contemporary social inquiry to consider what creative writing offers as a medium and method for research. Bring along something to write with
Letter re: belt and ash tray
No full textLetter from Edwin M. Watson, White House Appointments Secretary for President Franklin D. Roosevelt, to Amon Carter regarding a belt and ash tray for United States President Franklin D. Roosevelt
Letter re: belt and ash tray
No full textLetter from Edwin M. Watson, White House Appointments Secretary for President Franklin D. Roosevelt, to Amon Carter regarding a belt and ash tray for United States President Franklin D. Roosevelt
The density, construction and drag coefficient of electrostatic volcanic ash aggregates.
Full text linkRecent laboratory experiments have demonstrated that electrostatic charges generated during the fragmentation of volcanic pumice cause rapid aggregation of the silicate particles produced. Here, we present measurements of the mass and component particle size distribution of individual, electrostatically bound aggregates produced during these experiments. Particles produced by fracturing pumice aggregated as they fell ∼1.5 m within an enclosed fall chamber. Aggregate mass measurements indicate aggregate densities of ∼200 kg m−3 or less. The component particle size analysis demonstrates exponential-type cumulative distributions which are dominated (on a volume basis) by particles ∼10–40 μm in diameter and contain few particles >70 μm. By representing these particles as disks of 5 μm thickness the calculated aggregate densities are in agreement with those derived from the aggregate mass measurements and indicate a relatively constant aggregate density with size (in contrast with previous results from fall velocities). Combining the density measurements with fall velocity data allows the drag coefficient of aggregates to be determined. Empirical equations developed to describe the particle size distribution within aggregates are used to derive relative aggregation coefficients for the electrostatic aggregation process. Our results can be used within numerical models of volcanic plumes in order to improve their representation of electrostatic aggregation processes
Reading for realness: porn literacies, digital media, and young people
No full textThis paper adds to recent discussions of young people’s porn literacy and argues that researchers must address porn users’ engagements with, and understandings of, different porn genres and practices. As part of a larger interdisciplinary project which consisted of a series of systematic reviews of literature on the relationship between pornography use and healthy sexual development, we reviewed articles addressing the relationship between pornography use and literacy. We found few articles that present empirical data to discuss porn literacies, and those we found commonly frame young people’s porn literacy as their ability to critically read porn as negative and comprising ‘unrealistic’ portrayals of sex. This model of porn literacy tends to be heteronormative, where only conservative ideals of ‘good’, coupled, and vanilla sex are deemed ‘realistic’. Data from the literature we reviewed shows that young people make sophisticated distinctions between different kinds of pornography, some of which could be called ‘realistic’, as per do-it-yourself and amateur porn. We extend this discussion to young people’s understandings of ‘authenticity’ across their broader digital and social media practices. From this focus, we propose the need to incorporate young people’s existing porn literacies into future education and research approaches. This includes engaging with their understandings and experiences of porn genres, digital media practice, and representations of authenticity.</p
Nachdenken über die ästhetische Form von Ideen: Ash Watson im Gespräch mit Marc Ortmann
Full text linkSocial media, transport chaos and a volcanic ash cloud
No full textThe eruption of the Eyjafjallajokull volcano in Iceland caused the spread of an ash plume across Europe, leading to widespread closure of European air space, affecting passengers across the globe. This paper explores the use of social media by members of the public to respond to the transportation chaos. By making use of illustrations, this paper provides evidence to show how social media influences the emergence of social capital, in the form of information potential, during a disaster situation. Furthermore the paper seeks to highlight both the positive and negative impacts of the public’s use of social media at this time. This paper is not the result of a full empirical study; rather it is a starting point to highlight how some people are turning to digital technology to respond to adversity, by doing so this paper aims to encourage researchers to conduct further research into this field
From Dome to Disease: The Respiratory Toxicity of Volcanic Cristobalite
Full text linkExposure to fine-grained volcanic ash can potentially cause acute and chronic respiratory disease. The toxicity of ash is likely to vary depending on the type and style of eruption; eruptions at dome-forming volcanoes, in particular, can produce ash containing substantial quantities of respirable crystalline silica, a recognised human carcinogen and causative agent of silicosis. Volcanic domes crystallise crystalline silica as cristobalite, which is metastable at dome-forming temperatures (ca. 850 °C), through deposition from silica-saturated vapours and through devitrification of volcanic glass.
Five dome-forming volcanoes are studied to constrain the hazard posed by volcanic cristobalite, including: Colima, Mexico; Merapi, Indonesia; Mount St. Helens, USA; Santiaguito, Guatemala; and Unzen, Japan. The evolution of the cristobalite hazard is investigated from crystallisation in volcanic settings to its potential effect on biological systems, through a series of petrological, physicochemical and toxicological studies.
We rationalise the presence of metastable cristobalite below its stability field in all domes studied by way of a textural investigation, and conclude that the incorporation of aluminium and sodium into the silica structure facilitates crystallisation. Since particle toxicology is dependent on composition and structure, the observation of cation substitutions is expanded in a geochemical and thermodynamic investigation of volcanic cristobalite to constrain its mineralogy. We find that incorporation of 1-4 wt. % aluminium leads to a poorly-ordered cristobalite structure. This investigation facilitates a mineralogical comparison of the cristobalite hazard among volcanic locations and provides the framework for assessing volcanic cristobalite toxicity. We investigate the ability of volcanic ash to elicit an in vitro pro-inflammatory response, focusing on silica-mediated experiments, and relate the influence of structure and composition to the potential physiological burden. We find that volcanic cristobalite can be mineralogically considered as a single entity among locations, and that cristobalite-bearing ash is less toxic than expected. Nonetheless, we recommend that eruptions be considered on a case-by-case basis to most effectively aid the risk mitigation work of disaster managers globally
An advanced adjustable switch hybrid (Ash) concept for high power automotive converters
No full textIn this paper, we introduce an Adjustable Switch Hybrid (ASH) converter concept. The ASH targets the optimization of the electrical performance of high-powered automotive drive-trains depending on the different load conditions during drive cycles. The new concept employs in principle the previously reported Cross Switch (XS) Hybrid having a parallel arrangement of bipolar Silicon IGBTs and unipolar SiC MOSFETs for benefiting from the different electrical characteristics of each paralleled device. However, the ASH relies on a computational approach for the continuous and dynamic adjustments of the Si-IGBT to the SiC MOSFET area ratio through the gate units depending on the load conditions. In practical terms, changes in the loading conditions can be sensed and data will then be sent back to the ASH gate drive unit for the optimum device ratio selection. In other words, the ASH provides the drivetrain with an Electronic Transmission System or Gear type functionality.Accepted Author ManuscriptDC systems, Energy conversion & Storag
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