362 research outputs found

    Large scale dynamic systems

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    Classes of large scale dynamic systems were discussed in the context of modern control theory. Specific examples discussed were in the technical fields of aeronautics, water resources and electric power

    Never an Alibi: The Dialogical Museum

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    https://digitalmaine.com/academic/1006/thumbnail.jp

    Using the Arts for Food Research and Dialogue

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    This Briefing Paper is intended to share ideas and learning arising from the authors’ experiences of using arts-based methods in food research and engagement, as well as to give some insights into the issues that arose from a workshop for academics and Civil Society Organisations (CSOs) developed by Brighton and Sussex Universities Food Network (BSUFN) and hosted by the Food Research Collaboration (FRC) in 2016. It examines the use of participatory and community-centred approaches to explore pressing food policy questions, as well as providing guidance on how to apply these methods in practice. It is intended to be relevant to academics, particularly those interested in using participatory action research methods, and CSOs working with community groups on food issues. The authors’ main interest is the way in which arts-based methods provide a set of tools which can reveal, and give voice to, perspectives on food issues which remain otherwise absent from research and policy debates. In the authors' experience, this happens either because community members are not asked for their views or because of the way in which much traditional/positivist/biomedical academic research is based around pre-determined research questions that do not provide adequate space for community members to explore and voice their own concerns. It could be said that to date, much food research has failed to meaningfully engage with the general public, both during the research process itself and in raising awareness and achieving changes in the food system, which the research evidence indicates needs to happen. The paper firstly outlines why food research is a necessary and important area of exploration. Following this it examines the development, lineage and underlying principles of participatory and arts-based methodologies as approaches to research. Three arts-based and participatory methods are then reviewed in greater detail: i. Photography and film ii. Drama, and iii. Collage. These three methods were the focus of the BSUFN/FRC workshop in 2016. For each of these three examples, theoretical and methodological implications and ethical issues are discussed, enabling readers to fully consider how and why they might apply these approaches. In reviewing these emerging and alternative approaches for engaging communities in research processes, this paper presents a consideration of ideas, narratives, positions and actions relating to food, research and knowledge construction. The authors believe this paper to be an important addition to debates around how arts based and participatory methods might improve the processes, impact and contribution of food research. The paper presents a collaborative effort between academics, researchers and civil society organisations (CSOs) all of whom are concerned with improving research, learning and engagement in relation to food. The paper concludes with recommendations and suggestions on how academics and CSOs might use these methods as part of their research and/or practice

    Index to NASA Tech Briefs, 1972

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    Abstracts of 1972 NASA Tech Briefs are presented. Four indexes are included: subject, personal author, originating center, and Tech Brief number

    Analysis and Computation of Equilibria and Regions of Stability, With Applications in Chemistry, Climatology, Ecology, Economics

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    This record has been put together in a limited time for prompt distribution. It is not a proceedings volume. Rather it is a collection of all memoranda, diagrams, and literature references that were circulated before the workshop, used to support presentations during the workshop, or written down to preserve some ideas and some outcomes of computations that arose from the workshop. The only organizing principle is the temporal sequence in which the materials were presented or prepared

    Abstracts of Papers, 79th Annual Meeting of the Virginia Academy of Science, May 22-25, 2001, James Madison University, Harrisonburg, Virginia

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    Abstracts of papers that were presented at the 79th Annual Meeting of the Virginia Academy of Science, May 22-25, 2001, James Madison University, Harrisonburg, Virginia

    Space station systems: A bibliography with indexes (supplement 2)

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    This bibliography lists 904 reports, articles and other documents introduced into the NASA scientific and technical information system between July 1, 1985 and December 31, 1985. Its purpose is to provide helpful information to the researcher, manager, and designer in technology development and mission design according to system, interactive analysis and design, structural and thermal analysis and design, structural concepts and control systems, electronics, advanced materials, assembly concepts, propulsion, and solar power satellite systems. The coverage includes documents that define major systems and subsystems, servicing and support requirements, procedures and operations, and missions for the current and future space station

    Nonlinear Stochastic Systems And Controls: Lotka-Volterra Type Models, Permanence And Extinction, Optimal Harvesting Strategies, And Numerical Methods For Systems Under Partial Observations

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    This dissertation focuses on a class of stochastic models formulated using stochastic differential equations with regime switching represented by a continuous-time Markov chain, which also known as hybrid switching diffusion processes. Our motivations for studying such processes in this dissertation stem from emerging and existing applications in biological systems, ecosystems, financial engineering, modeling, analysis, and control and optimization of stochastic systems under the influence of random environments, with complete observations or partial observations. The first part is concerned with Lotka-Volterra models with white noise and regime switching represented by a continuous-time Markov chain. Different from the existing literature, the Markov chain is hidden and canonly be observed in a Gaussian white noise in our work. We use a Wonham filter to estimate the Markov chain from the observable evolution of the given process, and convert the original system to a completely observable one. We then establish the regularity, positivity, stochastic boundedness, and sample path continuity of the solution. Moreover, stochastic permanence and extinction using feedback controls are investigated. The second part develops optimal harvest strategies for Lotka-Volterra systems so as to establish economically, ecologically, and environmentally reasonable strategies for populations subject to the risk of extinction. The underlying systems are controlled regime-switching diffusions that belong to the class of singular control problems. We construct upper bounds for the value functions, prove the finiteness of the harvesting value, and derive properties of the value functions. Then we construct explicit chattering harvesting strategies and the corresponding lower bounds for the value functions by using the idea of harvesting only one species at a time. We further show that this is a reasonable candidate for the best lower bound that one can expect. In the last part, we study optimal harvesting problems for a general systems in the case that the Markov chain is hidden and can only be observed in a Gaussian white noise. The Wonham filter is employed to convert the original problem to a completely observable one. Then we treat the resulting optimal control problem. Because the problem is virtually impossible to solve in closed form, our main effort is devoted to developing numerical approximation algorithms. To approximate the value function and optimal strategies, Markov chain approximation methods are used to construct a discrete-time controlled Markov chain. Convergence of the algorithm is proved by weak convergence method and suitable scaling

    Strategies of Narrative Disclosure in the Rhetoric of Anti-Corporate Campaigns

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    In the years following World War II social activists learned to refine rhetorical techniques for gaining the attention of the new global mass media and developed anti-corporate campaigns to convince some of the world’s largest companies to concede to their demands. Despite these developments, rhetorical critics have tended to overlook anti-corporate campaigns as objects of study in their own right. One can account for the remarkable success of anti-corporate campaigns by understanding how activists have practiced prospective narrative disclosure, a calculated rhetorical wager that, through the public circulation of stories and texts disclosing problematic practices and answerable decision makers, activists can influence the policies and practices of prominent corporations. In support of this thesis, I provide case studies of two anti-corporate campaigns: the Amalgamated Clothing and Textile Workers Union vs. J. P. Stevens (1976 – 1980) and the Coalition of Immokalee Workers vs. Taco Bell (2001—2005). Each campaign represents a typology of practice within prospective narrative disclosure: martial (instrumental emphasis) and confrontation/alliance (popular, constitutive emphasis) respectively. The former is more likely to spark defensive responses and public backlash, and the latter is more likely to sway entire market sectors and produce lasting changes in the de facto corporate social responsibility standards of global markets
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