3,935 research outputs found

    Assessment of highly distributed power systems using an integrated simulation approach

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    In a highly distributed power system (HDPS), micro renewable and low carbon technologies would make a significant contribution to the electricity supply. Further, controllable devices such as micro combined heat and power (CHP) could be used to assist in maintaining stability in addition to simply providing heat and power to dwellings. To analyse the behaviour of such a system requires the modelling of both the electrical distribution system and the coupled microgeneration devices in a realistic context. In this paper a pragmatic approach to HDPS modelling is presented: microgeneration devices are simulated using a building simulation tool to generate time-varying power output profiles, which are then replicated and processed statistically so that they can be used as boundary conditions for a load flow simulation; this is used to explore security issues such as under and over voltage, branch thermal overloading, and reverse power flow. Simulations of a section of real network are presented, featuring different penetrations of micro-renewables and micro-CHP within the ranges that are believed to be realistically possible by 2050. This analysis indicates that well-designed suburban networks are likely to be able to accommodate such levels of domestic-scale generation without problems emerging such as overloads or degradation to the quality of supply

    ON THE PERFORMANCE OF NONPARAMETRIC SPECIFICATION TESTS IN REGRESSION MODELS

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    Some recently developed nonparametric specification tests for regression models are described in a unified way. The common characteristic of these tests is that they are consistent against any alternative hypothesis. The performance of the test statistics is compared by means of Monte Carlo simulations, analysing how heteroskedasticity, number of regressors and bandwidth selection influence the results. The statistics which do not use a bandwidth perform slightly better if the regression model has only one regressor; otherwise, some of the statistics which use a bandwidth behave better if the bandwidth is chosen adequately. These statistics are applied to test the specification of three commonly used Mincer-type wage equations with Uruguayan and Spanish data; all of them are rejected.

    Cultivating compliance: governance of North Indian organic basmati smallholders in a global value chain

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    Focusing on a global value chain (GVC) for organic basmati rice, we study how farmers’ practices are governed through product and process standards, organic certification protocols, and contracts with buyer firms. We analyze how farmers’ entry into the GVC reconfigures their agencements (defined as heterogeneous arrangements of human and nonhuman agencies which are associated with each other). These reconfigurations entail the severance of some associations among procedural and material elements of the agencements and the formation of new associations, in order to produce cultivation practices that are accurately described by the GVC’s standards and protocols. Based on ethnography of two farmers in Uttarakhand, North India, we find that the same standards were enacted differently on the two farmers’ fields, producing variable degrees of (selective) compliance with the ‘official’ GVC standards. We argue that the disjuncture between the ‘official’ scripts of the standards and actual cultivation practices must be nurtured to allow farmers’ agencements to align their practices with local sociotechnical relations and farm ecology. Furthermore, we find that compliance and disjuncture were facilitated by many practices and associations that were officially ungoverned by the GVC

    La enseñanza de las ciencias sociales en la formación docente : mås allå del texto escrito, el aporte de los lenguajes artísticos

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    A partir de la Ley Nacional de EducaciĂłn del año 2006 que extendiĂł la obligatoriedad de la enseñanza al nivel medio, nuevos sectores sociales accedieron a la escuela secundaria. Algunos de los que egresaron, pudieron iniciar carreras de FormaciĂłn Docente. Lograr el aprendizaje de estos nuevos alumnos planteĂł un desafĂ­o para todos los profesores, entre ellos, los de Ciencias Sociales. Justamente, este trabajo tiene como objetivo compartir algunas reflexiones sobre una experiencia educativa realizada en el marco de una investigaciĂłn que recibiĂł un subsidio del INFD. El proyecto, “MĂĄs allĂĄ del texto escrito: la potencialidad de diversos objetos culturales en la formaciĂłn de docentes", planteaba explorar las potencialidades didĂĄcticas de los objetos culturales para la enseñanza de las ciencias sociales, en un contexto de desigualdad y de diversidad cultural. EspecĂ­ficamente, para la investigaciĂłn se seleccionaron solo los objetos artĂ­sticos.Fil: Pipkin, Diana . Universidad de Buenos Aire

    Institutional strategies for capturing socio-economic impact of academic research

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    Evaluation of socio-economic impact is an emerging theme for publicly-funded academic research. Within this context the paper suggests that the concept of institutional research capital be expanded to include the capture and evaluation of socio-economic impact. Furthermore, it argues that understanding the typology of impacts and the tracking from research to impact will assist the formulation of institutional strategies for capturing socio-economic impact. A three-stage approach is proposed for capturing and planning activities to enhance the generation of high-quality impact. Stage one outlines the critical role of user engagement that facilitates the tracking of such impact. Stage two employs an analytical framework based on the criteria of ‘depth’ and ‘spread’ to evaluate impacts that have been identified. Stage three utilizes the outcomes of the framework to devise strategies, consisting of either further research (to increase depth) or more engagement (to increase spread) that will improve the generation of higher quality impact

    The tactical mimicry of social enterprise strategies: acting ‘as if’ in the everyday life of third sector organizations

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    Using England as a paradigmatic case of the „enterprising up ‟ of the third sector through social enterprise policies and programs, this article sheds light on resistance as enacted through dramaturgical identification with government strategies. Drawing from a longitudinal qualitative research study, which is interpreted via Michel de Certeau‟s theory of the everyday, we present the case study of Teak, a charitable regeneration company, to illustrate how its Chief Executive Liam „acted as ‟ a social entrepreneur in order to gain access to important resources. We establish „tactical mimicry ‟ as a sensitizing concept to suggest that third sector practitioners ‟ identification with the normative premises of „social enterprise ‟ is part of a parasitical prosaics geared toward appropriating public money. While tactical mimicry conforms to strategies only in order to exploit them, its ultimate aim is to increase potentials of collective agency outside the direct influence of power. The contribution we make is threefold: first, we extend the recent debate on productive resistance by highlighting how „playing the game ‟ without changing existing relations of power can nevertheless produce largely favorable outcomes. Second, we suggest that recognition of the productive potential of tactical mimicry requires methodologies which pay attention to the spatial and temporal dynamics of resistance. And third, we argue that explaining „social enterprise‟ without consideration of the non-discursive, mainly financial resources made available to those who identify with it, necessarily risks overlooking a crucial element of the dramaturgical dynamic of discourse

    Translocal imagination of Hong Kong connections: the shifting of Chow Yun-Fat's star image since 1997

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    Anyone who is interested in Hong Kong cinema must be familiar with one name: Chow Yun-fat (b. 1955). He rose to film stardom in the 1980s when Hong Kong cinema started to attract global attention beyond East Asia. During his early screen career, Chow established a star image as an urban citizen of modern Hong Kong through films such as A Better Tomorrow/Yingxiong bense (John Woo, 1986), City on Fire/Longhu fengyun (Ringo Lam, 1987), All About Ah-Long/A Lang de gushi (Johnnie To, 1989), God of Gamblers/Du shen (Wong Jing, 1989), and Hard Boiled/Lashou shentan (John Woo, 1992)
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