1,898 research outputs found
Oxidation of Aluminium-Magnesium alloys at elevated temperature in the solid, semi-liquid and liquid states
No full textThis thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.Sensitive thermogravimetric equipment was used to monitor the oxidation rates of A1-1 to 9% Mg alloys in 0.21 oxygen/0.79 helium mixtures with and without 0.03 atm water vapour pressure, in the temperature range 500-725°C which include their respective solid, semi-liquid and liquid states. These measurements were supported by structural and topographical studies of oxide films using SEM, X-ray diffraction, and TEM with electron diffraction and EDX techniques. The objective was to provide information in the context of dross formation during melting operations. The only oxidation product observed was MgO. The oxidation rates do not follow simple rate laws. The rate normally increases as the temperature is raised except for a curious inverse relationship for liquid alloys just above the liquidus temperatures due to the formation of undulating surfaces. An amorphous MgO film formed on liquid alloys restricted the initial oxidation but, following an incubation period, crystallisation of the film induced breakaway oxidation. The crystallisation was promoted by high magnesium contents, high temperatures and moist atmospheres. The oxidation rates for alloys in the semi-liquid state were as follows: (i) for 50% liquid, the rates were initially faster than those for wholly liquid alloys due to the presence of solid phase particles which acted both as disruptive stress-raisers and as sources of nuclei for crystallisation of the amorphous oxide film over the liquid phase. For the moist atmosphere: (i) wholly solid alloys and semi-liquid alloys with 50% liquid oxidised faster than in the dry atmosphere because of the injection of OH- ions into the oxide with consequent disruptive effects caused by hydrogen absorption by the alloy. The addition of 0.003% Be to Al-8% Mg alloy decreased the oxidation rate markedly by toughening the MgO films preventing cracking and hence the nucleation of tertiary MgO. Small additions of Mn or Zr offset the effect of Be and probably enhanced the Mg 2+ ion conductivity in the oxide by the 4+ injection of Mn 2+ , Mn 4+ or Zr ions. For alloys with Be, although breakaway eventually occurred it was not initiated by crystallisation of the amorphous film and moisture in the atmosphere increased the oxidation throughout the temperature range, 500-725°C.Financial support was provided by the
Science and Engineering Research Council (SERC), Swindon, U.K
From the ‘freedom of the streets’: a biographical study of culture and social change in the life and work of writer Jack Common (1903-1968)
No full textThe author assesses the life and work of the Newcastle upon Tyne born writer Jack Common in the light of the massive social, economic and cultural changes which have affected the North East of England and wider society through the period of Common's life and afterwards. He seeks to point out the relevance of Common to the present day in terms of his ideas about class, community and the individual and in the light of Common's sense of rebelliousness influenced by a process of grass-roots education and self-improvement. In addition, he draws upon his own extensive experience in community arts and education, looking, in particular, at the work he and others have carried out on Common over the last thirty years and assessing its value in the light of recent political changes. The author draws together the range of biographical and literary criticism carried out by a range of individuals over this period of time and brings into print hitherto unpublished material about Common's life and work by interviewing family members and associates, exploring the Common Archive at Newcastle University and other largely ignored sources, and studying Common's significant association with George Orwell in great detail. Through all of this, he seeks to argue that Common's life and ideas remain worthy of close attention in the present day
Jack Myers, 21st Annual ODU Literary Festival
No full textJack Myers born in Massachusetts, is Professor of English and Director of Creative Writing at Southern Methodist University; he also teaches in the low-residency Vermont College master of fine arts program in writing. He is co-editor of New American Poets of the 90’s, the author of six volumes of poetry, the latest being Blindsided (David R. Godine, 1993), and co-editor of five other reference works on poetry, including A Profile of American Poetry in the 20th Century, The Longman Dictionary of Poetic Terms, and the CD-anthology, Leaning House Poets, Vol. 1. He was a 1985 National Poetry Series Open Competition winner for his book, As Long As You’re Happy (selected by Nobel Laureate Seamus Heaney), and has received two Texas Institute of Letters awards and two National Endowment for the Arts fellowships
Disparity in Jack v Jack: Judicial Overreach or a Just Result at Long Last?
No full textThis article discusses the approach taken to enhanced income awards under s 15 of the Property (Relationships) Act 1976 in the recent decision of the High Court in Jack v Jack. The Court upheld the Family Court's award of 70 per cent of the relationship property pool to Mrs Jack to compensate her for economic disparity arising out of the division of functions in the relationship, on the basis she helped Mr Jack enhance his career and sacrificed her own earning potential. The author argues that in upholding the Family Court's findings on causation and accepting the broad brush assessment of quantum, the Court has increased the chances of a successful claim for an enhanced income award. In light of the underutilisation of the enhanced income aspect of s 15, this decision is a welcome step towards the fulfilment of the provision's aims
Detrital magnetite and chromite in Jack Hills quartzite cobbles: Further evidence for the preservation of primary magnetizations and new insights into sediment provenance
No full textAbstractThe magnetization of zircons from sedimentary rocks of the Jack Hills (Yilgarn Craton, Western Australia) provide evidence for a Hadean to Paleoarchean geodynamo, 4.0 to 4.2 billion years old. These magnetizations pass a microconglomerate test, attesting to the fidelity of Jack Hills zircons as recorders of these most ancient magnetic signals. The lack of pervasive remagnetization of the Jack Hills is also documented through a positive conglomerate test conducted on cobble-sized clasts. A key element of the latter test is the preservation of a high unblocking temperature magnetization that can survive peak metamorphic temperatures. Rock magnetic studies suggest the mineral carrier is magnetite. Herein, we investigate the magnetic mineral carriers in cobble samples through scanning electron microscope and microprobe analyses, conduct an inter-laboratory paleomagnetic study to evaluate sensitivities required to evaluate the weak magnetizations carried by the Jack Hills sediments, and assess provenance information constrained by the opaque minerals. These data confirm magnetite as a detrital phase and the presence of high unblocking temperature magnetizations, further supporting the posit that the Jack Hills sediments can preserve primary magnetic signatures. We note that some of these magnetizations are near the measurement resolution of standard cryogenic magnetometers and thus exacting laboratory procedures are required to uncover these signals. In addition to magnetite, the cobbles contain an assemblage of Mg poor Cr–Fe chromites, Ni-sulfides and pyrrhotite that suggest a source in a layered intrusion different from the granitoid source of the zircons. Any Hadean rock fragment in these sediments, if present, remains elusive
Experiment-based relations between level ice loads and managed ice loads on an Artic jack-up structure
No full textJack-ups have been constructed for numerous ocean environments, but to date there has been no operating experience under Arctic sea ice conditions. The current state of jack-up technology does not allow working outside the ice-free season and thus ice management will be needed to extend the drilling season. Currently, ice load calculations are reasonably well defined for level ice, while the ice loads due to managed ice are not known evenly well. In order to extend the drilling season for multi-legged jack-up structures by means of ice management, a better understanding of managed ice loads is required. To this purpose, the relation between level ice loads and managed ice loads on a multi-legged jack-up structure is investigated. Experiments for a 4-leg jack-up model were carried out in the ice tank of the Hamburgische Schiffbau-Versuchsanstalt (HSVA) in Germany, at a scaling ratio of 1:32. Two ice thicknesses (0.5 m and 1.0 m full scale) and three model orientations (0°, 22.5° and 45°) were tested. Additionally, ice concentration (level ice, 8/10th and 6/10th) and ice velocity (0.5 m/s and 1.0 m/s full scale) were varied. This paper reports on the model tests and the corresponding parametric study that was carried out with a focus on managed ice parameters. The relation between the observed level ice loads and the observed managed ice loads is quantified and discussed for varying orientations, ice velocities and ice thicknesses. Video and time series analyses were used to correlate ice loads to in-situ failure modes, and the results of these are summarised.Hydraulic EngineeringCivil Engineering and Geoscience
Characterization and structure in the development of Tudor comedy
No full textThe role of characterization in dramatic structure is assessed by theoretical criteria.
Characters who perform actions necessary for the completion of the narrative sequence are
said to be "bound" to the narrative; those without such obligations are "free". Characters
who maintain a single, constant meaning during the course of a play are said to be "static";
characters who change or develop into new roles are "dynamic". Horatian decorum
demanded that comic characters be static, and the characters of Plautine and Terentian
tradition were almost always bound to narrative intrigue. However, evaluations of six
Tudor comedies show an increasing use of non-classical characterization within the comic
form.
In the early comedies lohan lohan and Roister Doister all characters are bound and
static, yet the impetus to enlarge the role of characterization is evident. The characters of
lohan lohan are expanded from their French source, and Roister Doister includes
extraneous episodes in which Udall displays his braggart hero. Free characters abound in
Misogonus; as well the play brings dynamic characterization into the scope of comedy with
the conversion of its prodigal son.
Free characters offer new possibilities of non-narrative plotting. In comedies of the
1580s favourite traditional characters appear as diversions outside the action, and thematic
arrangements of characters inform the increasingly complex plots. Lyly stresses the
symbolic potential of characters in Endimion, whereas Greene uses dynamic
characterization to heighten the illusion of independent figures in Friar Bacon and Friar
Bungay. Love's Labour's Lost exposes the limitations of comic artifice by pulling the
characters between convention and individualization.
By the end of the sixteenth century free and dynamic characters had become
common, and characterization had established a sizable claim on the design of English
comedy. These developments set the English form apart from its neoclassical counterparts
Jack D. L. Holmes papers, W.0001
No full textAbstract: Correspondence, manuscripts, journal articles, newspaper clippings, and maps of this professor and Alabama author.Scope and Content Note: The collection contains correspondence, manuscripts, journal articles, newspaper clippings, and maps of this professor and author. The correspondence is primarily between Arrow Printing Company and Holmes about his book,
Honor and fidelity; the Louisiana Infantry Regiment and the Louisiana militia companies, 1766-1821. Most of the articles, papers, and newspaper clippings relate to his research on the early history of the Gulf Coast States, specifically Dauphin Island, Alabama, and Louisiana.One manuscript is in Spanish and is a compilation of approximately ten Spanish documents, edited by Holmes and published in 1963. The documents relate to the settlement of Louisiana, and include a description of the territory written by Governor Esteban Miro and a diary written by Governor Manuel Gayoso de Lemos.Another manuscript is a typescript copy of Holmes's English translation (done in 1980) of "Spanish New Orleans and Louisiana" by Jose Montero de Pedro and Marques de Casa Mena, published in October 1979 by the Centro de Cooperations Iberoamericana.Biographical/Historical Note: Jack David Lazarus Holmes was a Latin American studies historian and writer who often researched topics relating to colonial Gulf Coast history. He was a faculty member in the University of Alabama at Birmingham History Department.Holmes was born on 4 July 1930, in Long Branch, New Jersey. He received his bachelor's degree from Florida State University, master's degree from the University of Florida, and doctorate from the University of Texas. Dr. Holmes died in Birmingham, Alabama, in 1990
Jack\'s barbaric art: the serial killer as an allegory of the barbarity of capital in Lars von Trier\'s The House That Jack Built
No full textO propósito deste estudo é realizar uma análise com base materialista do filme A Casa Que Jack Construiu (2018), do cineasta dinamarquês Lars von Trier. O longa, que apresenta aproximações com a forma literária, se passa nas décadas de 1970 e 1980, no estado de Washington, EUA, e é narrado pelo protagonista, um serial killer que busca construir uma casa que seria não apenas uma obra arquitetônica, mas também uma manifestação artística. Esta pesquisa tem como objetivo demonstrar a função alegórica proporcionada pelos elementos da narrativa, como a caracterização do protagonista, o espaço, o tempo e o narrador. A análise, por meio de close reading , levanta a hipótese de que, desde a inserção do título do filme até o momento anterior aos créditos finais, o que se observa é uma projeção psíquica individual do protagonista. Busca-se explorar duas questões centrais sobre a obra. Primeiro, como o autor implícito utiliza os elementos do gênero de serial killer para expressar o ponto de vista da obra, mostrando o assassino em série como uma figura que, embora antissocial, exacerba comportamentos naturalizados pelo sistema neoliberal. E, segundo, de que maneira Lars von Trier emprega os recursos expressivos do cinema - como atuação, trilha sonora, iluminação e CGI - de forma géstica (brechtiana) para desvelar o processo histórico na narrativa de A Casa Que Jack ConstruiuThis study conducts a materialist analysis of Lars von Trier\'s film The House That Jack Built (2018), exploring its allegorical representation of historical and ideological dynamics. Set in 1970s and 1980s Washington State, USA, the film\'s narrative is delivered through the perspective of its protagonist, a serial killer striving to construct a house that transcends mere architecture to become a work of art. By closely analyzing narrative elements--including the protagonist\'s characterization, spatial and temporal settings, and the narrator--this research posits that the film operates as an individual psychic projection of the protagonist, from its titular reference to the moments preceding the final credits. Two central questions guide this analysis: (1) How does the implicit author utilize conventions of the serial killer genre to critique neoliberalism, portraying the protagonist as a figure whose antisocial tendencies amplify naturalized behaviors within the system? (2) How does Lars von Trier employ cinematic techniques--such as acting, soundtrack, lighting, and CGI--in a gestic (Brechtian) manner to expose the historical processes embedded in the narrative? Through this approach, the study demonstrates how The House That Jack Built intertwines personal and sociopolitical critique, revealing the interplay between individual pathology and systemic condition
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