13,289 research outputs found
Service-oriented models for audiovisual content storage
No full textWhat are the important topics to understand if involved with storage services to hold digital audiovisual content? This report takes a look at how content is created and moves into and out of storage; the storage service value networks and architectures found now and expected in the future; what sort of data transfer is expected to and from an audiovisual archive; what transfer protocols to use; and a summary of security and interface issues
Prediction of ash deposition for biomass combustion and coal/biomass co-combustion
No full textIn this thesis, a model that couples a reduced alkali kinetic mechanism for alkali sulphate formation during biomass combustion with an ash deposition model using computational fluid dynamics (CFD) techniques has been presented. Starting with a detailed gas-phase kinetic mechanism for the alkali chemistry, a systematic reduction procedure has been performed using a sensitivity analysis to reduce the reaction mechanism to a level that can be implemented into a CFD calculation. An ash deposition model that takes into consideration the ash-sticking probability and the condensation of potassium salts has been developed. The reduced mechanism and the deposition model developed are implemented into a CFD model to predict ash depositions in a 10 MWth biomass grate furnace.
Also, a CFD model to predict the deposition rates for the co-combustion of coal with biomass has been developed. This deposition model is based on the combined sticking probabilities of the ash particle viscosity and the melting behaviour of the ash particles. A Numerical Slagging Index (NSI) is also employed to estimate the degree of the sintering of the deposits. Experimental data from the Entrained Flow Reactor (EFR) at Imperial College, London, have been used to validate the models. The predicted results from both the ash deposition models agreed with the experimental measurements, and the NSI has successfully ranked the investigated coal-biomass mixtures according to their degree of sintering
The application of the metatheory of critical realism to questions in morality
No full textWhile it is argued that the acceptance of the metatheory of critical realism opens up the potential to address many of the problematic issues of morality (Bhaskar 1986; Collier 1994), the development of, what appear to be, four competing critical realist moral theories creates issues for this approach. These theories are Bhaskar’s Dialectical Critical Realist Ethics (1993), Collier’s theory of worth (1999), Sayer’s Lay Morality (2004, 2011) and Elder-Vass’s Realist Critique (2010). In addition to these theories of what morality is, all of these writers, and Price (2017), also provide separate answers to the question of how you can discover more about morality. While there are extensive discussions of the theories of Bhaskar and Elder-Vass there is, to date, no comparative study that explores all of these approaches to morality with respect to the underlying metatheory and to each other. In this thesis, I explore these theories through considering the questions of: the legitimacy and universal applicability of any moral argument; morality as an aspect of human nature and society; and how an enquiry into morality should progress. This approach enables Bhaskar, Elder–Vass, Collier, and Sayer to be understood as having applied the metatheory to different questions in morality and therefore provides an understanding of their similarities and points of agreement. From this research a comprehensive realist theoretical understanding of morality, which is a synthesis of the existing approaches, is produced; which I argue provides an overall theoretical framework which both facilitates and can be tested for its explanatory power through subsequent practical research
An assessment of the effects of pozzolanic activity on the behaviour of fly ash
No full textThis research used the ideas and methods, employed in previous studies of residual and weakly bonded soils, to help understand the shear strength and yielding characteristics of pozzolanically reacted fly ash. Samples of lagoon fly ash were supplemented by manufactured samples of fly ash/lime mortar. These were necessary to address the problem of wide variations and lack of observed bonding found in early tests on lagoon fly ash. The manufactured samples proved to be stronger and stiffer with a greater consistence between specimens, although their internal structure proved to be clumpy and the de-bonding method failed to remove all the bonding. The two forms of fly ash showed that the pozzolanic bonding was affected by confining pressure and axial strains. Under undrained conditions the build up of pore water pressures was shown to reduce the influence of pozzolanic bonding in stress space. The critical state line derived for the lagoon fly ash was linear to the extent of using conditions and also adequately described those of the mortar fly ash. As no one method for analysing the yielding characteristics could be found, a number of methods were cross-referenced in this research. Both forms of fly ash showed multiple yields that could be resolved to match the classic First and Second yield model. The loci of yields identified demonstrated the isotropic and anistropic nature of the mortar and lagoon fly ashes respectively. Despite the variations seen in the lagoon fly ash samples and the difference with the mortar samples the results point to common critical state parameters for unbonded fly ash and limiting condition for pozzolanic bonding within stress space
Pottery: ash tray
No full textThis porcelain ash tray has a white glaze on the outside to which blue-green mineral crystals have been added. It was made by W.B. Stephen of Pisgah Forest Pottery in 1948. Walter Benjamin Stephen (1875-1961) also known as W.B. Stephen, founded Pisgah Forest Pottery around 1926 in Arden, North Carolina. It continued his Nonconnah Pottery of Tennessee, which he worked with his mother. Stephen moved to the Asheville area in 1913. Stephen experimented with crystalline glaze effects for many years. This piece was donated to Southern Highland Craft Guild by Eunice Taylor
Justine Ash - Master of Music - Masters Recital
No full textSelections from Brentano Lieder, Op. 68: An die Nacht; Ich wollt ein Sträusslein binden; Säusle, liebe Myrthe / Richard Strauss (1864-1949) -- stand with your lover on the ending earth; in time of daffodils / Stephen Ash (b. 1993) - Quia Respexit from Magnificat / Johann S. Bach (1685-1750) -- Laudate Dominum from Vesperae solennes de confessore / Wolfgang A. Mozart (1756-1791) -- Cycle of Holy Songs: Psalm 134; Psalm 142; Psalm 148; Psalm 150 / Ned Rorem (1923-2022) -- I know that my Redeemer liveth from Messiah / George F. Handel (1685-1759)Music, Moores School o
AC-6-U.S. Naval Planes Flying in Formation, Langley Field, VA/Thank-You Card from Stephen Tury to the Hungarian Defense Council.
No full textThis postcard, which depicts U.S. Naval planes flying in formation, was sent to the Hungarian Defense Council by Private Stephen Tury. The Council was organized in New Brunswick by leaders of local Hungarian churches and societies. During the Second World War it sent supplies, such as the carton of cigarettes Tury is thanking it for, to members of the military of Hungarian descent from the New Brunswick area
Author Stephen Flynn Discusses Resiliency
No full textCenter for Homeland Defense and Security, PRESS RELEASESOn September 25, Author Stephen E. Flynn stopped by the Center’s National Capital Region campus to speak with CHDS Master’s degree students about his latest book, answer questions and discuss..
Letter from Carl Hayden to Stephen Mather, National Park Service
No full textLetter from Carl Hayden to Stephen Mather regarding the sale of Bass properties
Letter from Carl Hayden to Stephen Mather, National Park Service
No full textLetter from Carl Hayden to Stephen Mather requesting that congress pay W. W. Bass the sum of twenty-five thousand dollars for his properties
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