7,567 research outputs found

    Impact and puncture resistant material protects parts from damage

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    Uniform sized, laminated panels protect delicate parts and equipment from damage during storage and transportation. The panels consist of sheets of steel foil bonded between sheets of elastic foam. They are lightweight, impact and puncture-resistant, and, when formed into an enclosure, provide a barrier against moisture and thermal shock

    Editors’ Introduction

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    University Course Explores The Mystery And History Of Dreams

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    On a frame theoretic measure of quality of LTI systems

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    It is of practical significance to define the notion of a measure of quality of a control system, i.e., a quantitative extension of the classical notion of controllability. In this article we demonstrate that the three standard measures of quality involving the trace, minimum eigenvalue, and the determinant of the controllability grammian achieve their optimum values when the columns of the controllability matrix from a tight frame. Motivated by this, and in view of some recent developments in frame theoretic signal processing, we provide a measure of quality for LTI systems based on a measure of tightness of the columns of the reachability matrix

    Benefits and challenges of applying outcome mapping in an R4D project

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    The Community-based Fish Culture in Seasonal Floodplains and Irrigation Systems (CBFC) project is a five year research project supported by the Challenge Program on Water and Food (CPWF), with the aim of increasing productivity of seasonally occurring water bodies through aquaculture. The project has been implemented in Bangladesh, Cambodia, China, Mali and Vietnam, where technical and institutional options for community based aquaculture have been tested. The project began in 2005 and was completed in March 2010. There is an increasing demand for researchers to demonstrate the impact of the work within project time frames, yet development is a complex, non-linear process emerging from changes that traditional, managerial approaches to development fail to capture or to understand. Methods to address unanticipated change and increasingly important æsoftÆ outcomes, such as improved governance have not yet been widely tested or adopted. In response to this gap, this paper describes lessons learned during the pilot testing of Outcome Mapping as part of an action research process in Vietnam, and presents an abridged OM methodology for application at the community level.Research, Impact assessment, Livelihoods

    Conditions for collective action: understanding factors supporting and constraining community-based fish culture in Bangladesh, Cambodia and Vietnam

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    In 2005, the WorldFish Center embarked on a project to pilot test approaches to community-based fish culture (CBFC) in five countries. A previous study conducted between 1997-2000 demonstrated the potential of the approach in Bangladesh and Vietnam, although a greater understanding was needed regarding the social and institutional factors that would permit the development of CBFC in larger waterbodies to reach a greater number of beneficiaries. The five countries selected for dissemination of CBFC included Cambodia, Vietnam, China, Bangladesh and Mali, each very different in terms of history, politics, social-cultural context, aquaculture experience and development status. They appeared to share environmental characteristics, all having seasonally flooding areas and experience of rice-fish culture. This report presents the findings of this study, based on a detailed evaluation undertaken in 2008-2009 in Cambodia, Vietnam and Bangladesh. Mali and China were not included in the study, both for reasons of time and cost, and due to the different path that project development had taken in each country. Although the research was conducted as consistently as possible across the three countries, using the same methodology in each location, the results are nonetheless also indicative of the differences encountered at each location. The diversity of reasons why CBFC worked and didnÆt work led to difficulties in drawing conclusions across countries, or in quantifying results, with the exception of Vietnam where the number of communities involved in the study made quantification possible. The findings of the study are therefore primarily qualitative in nature, with figures provided relating to number of responses where available. The issues raised by respondents participating in the study are grouped according to environmental conditions, socio-cultural conditions, livelihood context, institutional context, markets and economic viability, technical issues and implementation and incentives and disincentives for uptake and continuance. The report concludes with a summary of lessons learned.Inland fisheries, Flood plains, Rice field aquaculture, Participatory approach, Cambodia, Vietnam, Bangladesh,

    Shepherd's Dilemma

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    Recent outbreaks of Rift Valley Fever in sheep have led to boycotts of African livestock by Middle Eastern importers. To normalize trade, attempts have been made to apply new livestock forecasting and monitoring technologies. In this process, producers have exhibited a resistance in revealing livestock health information, a resistance that could jeopardize the information system and lead to further boycotts. We investigate the incentives governing this problem and model the most fundamental contract issues, those concerning reputation and credibility. Equilibrium contracts require that the buyer compensate the producer for private information to address the shepherd's dilemma of concealing livestock information (and facing continued boycotts) or revealing the information and being blacklisted.Livestock Production/Industries,
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