1,721,549 research outputs found
Dr. David Nicholas Dalton.
No full textDr. David Nicholas Dalton (1860-1928). Dr. Dalton was a physician in Winston-Salem.Photo made in the 1920s
David Nicholas: Urban Europe 1100-1700.: Palgrave Macmillan, Basingstoke – New York 2003, 239 + xii s.
Full text linkA review of the film by David Nicholas
David Nicholas. Trade, Urbanisation and the Family. Studies in the History of Medieval Flanders.
No full textBoone Marc. David Nicholas. Trade, Urbanisation and the Family. Studies in the History of Medieval Flanders.. In: Revue belge de philologie et d'histoire, tome 77, fasc. 2, 1999. Histoire médiévale moderne et contemporaine - Meddeleewse, moderne en hedendaagse geschiedenis. pp. 679-680
David Nicholas, The van Arteveldes of Ghent. The Varieties of Vendetta and the Hero in History, 1988
No full textSommé Monique. David Nicholas, The van Arteveldes of Ghent. The Varieties of Vendetta and the Hero in History, 1988. In: Revue du Nord, tome 73, n°293, Octobre-décembre 1991. pp. 799-800
David Nicholas — The domestic life of a medieval city : women, children and the family in fourteenth-century Ghent
No full textBonneuil Noël. David Nicholas — The domestic life of a medieval city : women, children and the family in fourteenth-century Ghent. In: Population, 41ᵉ année, n°6, 1986. p. 1099
David Nicholas, The van Arteveldes of Ghent. The Varieties of Vendetta and the Hero in History, 1988
No full textSommé Monique. David Nicholas, The van Arteveldes of Ghent. The Varieties of Vendetta and the Hero in History, 1988. In: Revue du Nord, tome 73, n°293, Octobre-décembre 1991. pp. 799-800
Review Essay: David Nicholas, \u3ci\u3eThe Van Arteveldes of Ghent: The Varieties of Vendetta and the Hero in History\u3c/i\u3e
Full text linkDavid Nicholas, The Van Arteveldes of Ghent: The Varieties of Vendetta and the Hero in History, Cornell University Press, 1988
Antimony diffusion in silicon-germanium alloys
No full textThe objective of this work was to study the diffusion of antimony in silicon-germanium alloys which are of great commercial interest because of their potential for fabricating higher performance devices such as heterojunction bipolar transistors and heterojunction field effect transistors.Knowledge of the diffusion of antimony will give fundamental material information about point defect species and populations in the alloy system and silicon itself. This work represents a fundamental materials study on the nature of diffusion in this system.The work comprises of furnace anneals of silicon/silicon-germanium heterostructures grown by MBE to incorporate buried antimony delta-layers. Antimony concentration was measured using Secondary Ion Mass Spectrometry (SIMS) and a method for determining diffusivities from SIMS measurements of ultra-fine layers is introduced.This work constitutes the first ever measurement of antimony diffusivities in silicon-germanium alloys. Diffusitivies ranged from 4.63x10-18 cm2/s in Si0.9Ge0.1 to 1.61x10-17cm2/s in Si0.7Ge0.3 measured at 800oC: successively higher than the antimony diffusivity in silicon. These results are consistent with later studies.The results of a diffusivity vs. time study and a diffusivity vs. silicon-germanium composition study are included. Equilibrium antimony diffusion coefficients in alloys of up to 30% germanium are presented along with a possible transient effect. Changes in antimony diffusivity are attributed to changes in the vacancy population and the vacancy enthalpy of migration.Comparisons with the diffusivity of boron vs. germanium content in silicon-germanium alloys lead to the proposal that, in silicon rich alloys, boron diffuses predominantly via the interstitialcy mechanism. The dependence of diffusivity on germanium content for boron is different to that of antimony and it is proposed that the boron diffusion mechanism changes from largely interstitialcy in silicon to vacancy in germanium - the change occurring at round 40% germanium.</p
Sexuality, community and urban space : An exploration of negotiated senses of communities amongst gay men in Brighton
No full textThis thesis examines the relationships between sexuality, communality and space through the exploration of changing senses of community experienced by gay men in Brighton. A review of changing conceptualisations of sexuality reveals that the formation of sexual identities, communities and urban spaces cannot be reduced to a single historical narrative but are influenced by numerous contextual factors. In response, the thesis develops what is termed a 'negotiative framework' in which the tensions and contradictions associated with these differences can be reconciled with the need for strategic senses of resistance and solidarity. It is argued that Barthes' writings on doxa (systems of repression and control), paradoxa (forces of transgression) and atopia (processes occurring between and beyond these forces) provide such a negotiative framework.Drawing upon evidence from in-depth, qualitative semi-structured interviews with gay men in Brighton, supplemented by group interviews and the analysis of secondary sources of historical documentation, five paths of transgression are observed: the establishment of the early underground scene; the gay political organisations formed in the wake of threats to civil liberties; the responses to HIV and AIDS; the responses to police harassment; and finally the development of the gay commercial scene. The study reveals how sites of both doxa and paradoxa are diverse and spatially and temporally contextual. Exploring changing conceptualisations of community amongst gay men in Brighton illustrated how concepts of atopia can reconcile bounded and boundless conceptions of space.The Barthes-inspired approach of this thesis contributes to post-structuralist and queer theories by relating issues of negotiativity and process in a non-binaristic way to the functioning of systems of restraint and resistance in the context of gay spaces.</p
Electrochemical reactions at very small electrodes
No full textTo measure fast electrode processes, high rates of mass transfer of the electroactive species to the electrode surface are essential. This has been achieved in the present study by forming very small electrodes of radius <5am (appropriately termed microelectrodes); it is shown that mass transfer to these electrodes is enhanced above the rate to a planar electrode of equivalent area by virtue of an additional steady state flux term inversely proportional to the electrode radius,so that under conditions of very slow linear potential sweep, i.e. pseudo steady state, the rate of mass transfer is determined by the steady state term alone. In the first part of this work, electrodes prepared from lead, tungsten and platinum, all sealed into glass, have been used to measure the rate of the heterogeneous electron transfer reactions of a number of aromatic, nitroaromatic and nitroaliphatic compounds in Dimethylformamide. Both slow linear potential sweep and fast linear potential sweep analyses were performed; the latter with the development of convolution potentialsweep voltammetry methods applicable to very small electrodes. It is shown that for the reduction of tert - nitirobutane this technique can be applied over a wide potential range giving results in close agreement with those obtained by other workers using alternative non steady state methods. Deviation from Butler -Volmer behaviour was observed for this reaction and interpreted in terms of the Marcus theory. For faster electron transfer reactions, however, electrode dimensions available at the time were found to be too large to allow measurement of the electron transfer rates due to partial mass transfer control of the electrode reaction, even under fast linear potentialsweep conditions. In the second part of this work, the rates of homogeneous chemical reactions preceding the electron transfer step were studied. The rate of dissociation of acetic acid in sodium acetate solutions was investigated using platinum microelectrodes under conditions of slow linear potential sweep and found to be in reasonable agreement with values obtained by other workers, indicating that enhanced rates of mass transfer at microelectrodes may be employed to measure the rates of both homogeneous and heterogeneous electrode reactions under pseudo steady state conditions.</p
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