157 research outputs found
Geophysical characterization of hydrothermal systems and intrusive bodies, El Chichón volcano (Mexico)
No full text[1] The 1982 explosive eruptions of El Chichón volcano (Chiapas, Mexico) destroyed the inner dome and created a 1-km-wide and 180-m-deep crater within the somma crater. A shallow hydrothermal system was exposed to the surface of the new crater floor and is characterized by an acid crater lake, a geyser-like Cl-rich spring (soap pool), and numerous fumarole fields. Multiple geophysical surveys were performed to define the internal structure of the volcanic edifice and its hydrothermal system. We carried out a high-resolution ground-based geomagnetic survey in the 1982 crater and its surroundings and 38 very low frequency (VLF) transects around the crater lake. A 3-D inversion of the ground-based magnetic data set highlighted three high-susceptibility isosurfaces, interpreted as highly magnetized bodies beneath the 1982 crater floor. Inversion of a digitized regional aeromagnetic map highlighted four major deeply rooted cryptodomes, corresponding to major topographic highs and massive lava dome outcrops outside and on the somma rim. The intracrater magnetic bodies correspond closely to the active hydrothermal vents and their modeled maximum basal depth matches the elevation of the springs on the flanks of the volcano. Position, dip, and vertical extent of active and extinct hydrothermal vents identified by VLF-EM surveys match the magnetic data set. We interpret the shallow lake spring hydrothermal system to be mostly associated with buried remnants of the 550 BP dome, but the Cl-rich soap pool may be connected to a small intrusion emplaced at shallow depth during the 1982 eruption
Cromwell Varley FRS, electrical discharge and Victorian spiritualism
No full textThis is a preprint version of an article published in Notes and Records of the Royal Society. The definitive version is available at: http://publishing.royalsociety.org/index.cfm?page=1083Cromwell Fleetwood Varley is chiefly remembered as a leading Victorian electrical engineer who was closely involved in the testing and laying of the successful transatlantic telegraph cables of the 1860s. Historians of physics principally regard him as a key figure in the 'prehistory' of the electron because in 1871 the Proceedings of the Royal Society published a paper in which he seemed to anticipate the corpuscular nature of cathode rays. For many Victorians, however, Varley was as notable for his spiritualism as for his electrical researches. This paper argues that for Varley spiritualism was one of the most significant contexts of use for the 1871 paper. The latter work sought explicitly to unravel the mystery of the electrical discharge through rarefied gases but also showed the hazy boundary between the invisible and visible and material and immaterial domains. This suggested that one of the invisible powers associated with spiritualism—the 'od' force—might be photographed and rendered scientifically more credible, and also made it easier to understand how imponderable spirits could have apparently material attributes. Although the physical implications of Varley’s 1871 publication were not explored until the 1890s, Varley's 'spiritualistic' uses of it shaped the way in which some late-Victorian scientists investigated the puzzling phenomena of psychical research
Identification of structural controls in an active lava dome with high resolution DEMs : Volcán de Colima, Mexico
No full textMonitoring the topography of active lava domes is critical for detecting changes that may trigger or influence collapse or explosive activity. Internal dome structure and conditions are more difficult to elucidate, but also play vital roles. Here, we describe the exposure (following an explosion) of significant scarps in the active dome at Volcán de Colima, Mexico, that are interpreted as evidence of brittle failure planes and a complex internal dome morphology. In the first use of automated 3D computer vision reconstruction techniques (structure-from-motion and multi-view stereo, SfM-MVS) on an active volcanic dome, we derive high resolution surface models from oblique and archive photographs taken with a consumer camera. The resulting 3D models were geo-referenced using features identified in a web-sourced orthoimage; no ground-based measurements were required. In December 2010, the dome (2.14×106 m3) had a flat upper surface, reflecting an overall ductile emplacement regime. Between then and May 2011, a period of low explosivity was accompanied by a small volume loss (0.4×105 m3) and arcuate steps appeared in the dome surface, suggesting the presence of localized planes of weakness. The complex array of summit scarps was exposed following a significant explosion in June 2011, and is interpreted to be the surface expression of fault planes in the dome. The 1-m resolution DEMs indicated that the region of greatest volume loss was not coincident with the assumed location of the conduit, and that heterogeneity within the dome may have been important during the June explosion
Embodiment in 3D virtual retail environments: exploring perceptions of the virtual shopping experience
No full textThe customer can now easily create, and customize, their own personal three dimensional (3D) virtual bodies in a variety of virtual environments; could you, by becoming a virtual body, actually enhance your online shopping and buying experiences or, would this potentially inhibit the pure visceral pleasure of retail therapy?
"Second Life allows you to be a celebrity in your own lunchtime, .…you can design the body you've always wanted, and indulge your fashionista fetish for very little money. You can be the most attractive, best-dressed version of yourself you can imagine."
This paper investigates online shopping in Second Life, through the experience of being avatars.
We will discuss the possibilities of using avatars as brand new consumer identities for personalised and customised fashion shopping within the 3D multi user virtual environment, and question the influences and effects of these developments on the traditional high street shopping trip.
The hyper un-realistic and non-sensory interface of online shopping for clothes has been hotly debated over the last decade; through the media, the industry and most importantly by the buying public. The customer’s inability to try on and experience the product has been the main inhibitor to shopping on-line, and the high levels of product returns in home shopping dramatically reflect this reality. Faster broadband connections and improved 2D web sites are making clothes shopping on the web more accessible, and for important customer groups, such as young professional females, and plus-size teenagers, virtual 3D technologies offer freedom of choice in any location.
Retailers are now confidently providing different shopping experiences by combining 2D and 3D interactive visualisation technologies with advanced marketing techniques, to create virtual retail environments that attempt to actualise the true essence of shopping; by browsing, socialising, trying-on before buying and, in a new twist, leaving the store proudly wearing the item just purchased. American Apparel, Bershka, L’Oreal, Calvin Klein, Reebok, Sears, Nike and Adidas are pioneering virtual mega stores, and all offer newly innovative, and alternative shopping experiences inside 3D multi user virtual environments.
An experiential and exploratory approach will be used to investigate fashion brands, and their virtual 3D stores in Second Life. As 3D avatars, we will record a range of customer perceptions and attempt to map their shopping patterns in this massively popular virtual world. The qualitative data gathered will inform discussions about the value of the virtual shopping experience for the customer and the retailer. Conclusions will also question the possibility of using avatars in a virtual shopping environment to acquire accurate body specifications for better fit and the collection of personal details for use in the future development of alternative shopping experiences
A New Gaea Hypothesis: The Creation of New Feminist Archetypes in the Work of John Varley
No full textabstract: This thesis examines the use of the earth goddess figure in John Varley's Gaean Trilogy (1979-1984). In the figure of Gaea (Varley's alien goddess villain), the reader is presented with a host of popular culture feminine archetypes with connotations connected to the long-standing tradition of associating femininity and materiality, and Varley's literary examination, operating through the exaggeration of these archetypes, displays their essential flaws. The ultimate antagonistic functions of these archetypal figures, relative to the human characters occupying the world underwritten by them, suggests that Varley uses such figural archetypes to deconstruct, via their varied failures, both the archetypes themselves and the evocative symbolic contexts associated with them, therein demonstrating their inherent limitations and providing a cautionary tale that highlights the fallibility of projective archetypal construction-even seemingly positive ones. By examining these archetypes as performances of gender, the thesis illustrates Varley's integration, at the end of the 1970's, of second-wave feminist theoretical ideals into science fiction (a genre with a long history dedicated to the experimental examination of all social typology) initially sets up and then subsequently breaks down the archetypal villain, thus pursuing a political dimension as well. The narrative experiment in typology promotes a turning away from the ancient symbolic associations of femininity to explore a new kind of goddess, one not reliant on pre-existing archetypes but one more attuned to the emergence of "gender" itself as a construct used to define the feminine itself.Dissertation/ThesisM.A. English 201
Fiber Reinforced Shotcrete — A Comparison Between Steel Fiber and the New Synthetic Fiber
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