8,562 research outputs found

    Systems, interactions and macrotheory

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    A significant proportion of early HCI research was guided by one very clear vision: that the existing theory base in psychology and cognitive science could be developed to yield engineering tools for use in the interdisciplinary context of HCI design. While interface technologies and heuristic methods for behavioral evaluation have rapidly advanced in both capability and breadth of application, progress toward deeper theory has been modest, and some now believe it to be unnecessary. A case is presented for developing new forms of theory, based around generic “systems of interactors.” An overlapping, layered structure of macro- and microtheories could then serve an explanatory role, and could also bind together contributions from the different disciplines. Novel routes to formalizing and applying such theories provide a host of interesting and tractable problems for future basic research in HCI

    Lewis Swift.

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    Schwarzschild-anti de Sitter within an Isothermal Cavity: Thermodynamics, Phase Transitions and the Dirichlet Problem

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    The thermodynamics of Schwarzschild black holes within an isothermal cavity and the associated Euclidean Dirichlet boundary-value problem are studied for four and higher dimensions in anti-de Sitter (AdS) space. For such boundary conditions classically there always exists a unique hot AdS solution and two or no Schwarzschild-AdS black-hole solutions depending on whether or not the temperature of the cavity-wall is above a minimum value, the latter being a function of the radius of the cavity. Assuming the standard area-law of black-hole entropy, it was known that larger and smaller holes have positive and negative specific heats and hence are locally thermodynamically stable and unstable respectively. In this paper we present the first derivation of this by showing that the standard area law of black-hole entropy holds in the semi-classical approximation of the Euclidean path integral for such boundary conditions. We further show that for wall-temperatures above a critical value a phase transition takes hot AdS to the larger Schwarzschild-AdS within the cavity. The larger hole thus can be globally thermodynamically stable above this temperature. The phase transition can occur for a cavity of arbitrary radius above a (corresponding) critical temperature. In the infinite cavity limit this picture reduces to that considered by Hawking and Page. The case of five dimensions is found to be rather special since exact analytic expressions can be obtained for the masses of the two holes as functions of cavity radius and temperature thus solving exactly the Euclidean Dirichlet problem. This makes it possible to compute the on-shell Euclidean action as functions of them from which other quantities of interest can be evaluated exactly.Comment: 23 pages, Late

    Notes on actinomycosis, and its transmissibility to the human subject

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    I refer to the question of the transmissibility of some bovine diseases to human beings by the consumption of the meat of diseased animals. The primary object of my paper is to show that there is prevalent amongst the cattle in Tasmania, as well as in the adjacent colonies, from which we obtain a large proportion of our meat supply, a disease which resembles tuberculosis in some respects, but differs from it in the specific micro-organism that is the cause of the disease, and yet, like tuberculosis, is transmissible to the human subject, and is almost as distressing in its consequences. Soon after the publication of the discovery of the actinomyces or ray-fungus iu diseased cattle, the same vegetable parasite was found in man; and it was then seen that the tumours in the bovine species presented great similarity to those found in the human subject, leading to the presumption that it was identically the same disease. It has been shown by experiment that the introduction of the fungus by inoculation into a calf has produced swellings which contained the characteristic clubs of the fungus, thus suggesting that this disease can be transmitted by direct inoculation. Many similar experiments have been made with a view to prove the transmissibility of this vegetable parasite from animal to animal, and in the majority of cases with a positive result

    The role of the courts in the application of consumer protection law: A comparative perspective

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    The vast majority of jurisdictions (in particular, the European Union and South Africa) conform to the United Nations Guidelines for Consumer Protection, whereby governments are encouraged to establish and maintain legal and administrative measures to enable a consumer to obtain redress through both formal and informal procedures, with particular regard to the needs of vulnerable (low-income) consumers. The Guidelines for Consumer Protection encourage the resolution of consumer disputes in a manner that is not only fair and expeditious, but also includes the establishment of voluntary mechanisms and procedures. In this regard, the European Union and South Africa have established redress and enforcement of consumer protection mechanisms with a primary focus on consensual consumer dispute resolution and, more specifically, alternative dispute resolution. This does not, however, diminish the important role and responsibility that courts have in the effective enforcement of consumer protection law. This contribution aims to establish the role of the courts in this regard, not only for the advancement of consumer rights and consumer protection law, but also taking into account the ex officio role of the courts in relation to the effective (or ineffective) alternative dispute resolution mechanisms that are currently in place. The contribution analyses the comparative positions in the European Union and South Africa. In terms of the European Union position, focus is placed on the application of the relevant consumer directives within Member States, taking into account pre-existing national law and its interpretation by national courts. The primary focus, in terms of the South African position, is an analysis of the enforcement institutions and redress provisions contained in the Consumer Protection Act 68 of 2008, taking into account the interpretation of these provisions by the relevant institutions and the courts. This contribution highlights problematic issues with the current alternative dispute resolution mechanisms, resulting in ineffective consumer protection and the ex officio role of the courts to address these issues. It aims to confirm that the right to access to the courts is a constitutionally entrenched right and a balance between effective formal and informal enforcement should be the aim

    Last letter Barnard E. Bee wrote to his brother H.P. Bee, June 20, 1861

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    Bee sends his love to his brother\u27s family and asks that his son be taken care of should I fall in this war.https://digitalcommons.wofford.edu/littlejohnmss/1282/thumbnail.jp
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