32 research outputs found

    Yang-Mills- and D-instantons

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    In these lectures, which are written at an elementary and pedagogical level, we discuss general aspects of (single) instantons in SU(N_c) Yang-Mills theory, and then specialize to the case of N = 4 supersymmetry and the large N_c limit. We show how to determine the measure of collective coordinates and compute instanton corrections to certain correlation functions. We then relate this to D-instantons in type IIB supergravity. By taking the D-instantons to live in an AdS5×S5AdS_5\times S^5 background, we perform explicit checks of the AdS/CFT correspondence.Comment: 62 pages, typos corrected, table of contents and references adde

    Pre-treatment and extraction techniques for recovery of added value compounds from wastes throughout the agri-food chain

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    Pre-treatment and extraction techniques for recovery of added value compounds from wastes throughout the agri-food chain

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    The enormous quantity of food wastes discarded annually force to look for alternatives for this interesting feedstock. Thus, food bio-waste valorisation is one of the imperatives of the nowadays society. This review is the most comprehensive overview of currently existing technologies and processes in this field. It tackles classical and innovative physical, physico-chemical and chemical methods of food waste pre-treatment and extraction for recovery of added value compounds and detection by modern technologies and are an outcome of the COST Action EUBIS, TD1203 Food Waste Valorisation for Sustainable Chemicals, Materials and Fuels

    Geography, psychology and the 'Big Five' personality traits: who moves, and over what distances, in the United Kingdom?

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    Personality, as measured by the 'Big Five' dimensions of agreeableness, openness, extroversion, neuroticism and conscientiousness, has been explored in the social psychological literature as a predictor of migration but so far has received very little attention in the geographical literature, which is surprising given its predictive importance and also evidence that the selectivity of migration shapes area personality profiles. Using the Understanding Society 1 data set, this paper analyses how personality influences whether a respondent moves or not over a 5-year period and, if they do, how far they move. After controlling for individual sociodemographic characteristics, it is found (a) that those who score higher on conscientiousness and neuroticism are more likely to expect to move in the next year; (b) that only those who score highly on extroversion actually made at least one move during the 5-year period; (c) that openness is positively associated with making a long-distance move (≥50 km); and (d) that the pattern for (c) is reversed for short-distance moves (<10 km). These findings are significant for two reasons. First, they show that personality should be more central in migration studies and that geography can usefully seek disciplinary insights from social psychology. Second, they help us take a step towards a better understanding of the relationships between geography, personality and spatial mobility
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