Consulta: subjectFacets:"Power"
Registros recuperados: 55
Data/hora: 09/06/2024 14:44:10

Una expresión explícita para la potencia media de pruebas de no inferioridad para la comparación de proporciones.
Provedor de dados: 32
Autores: Anguiano Mondragón, Emmanuel.
Las pruebas de no-inferioridad para comparar proporciones son frecuentemente empleadas en los ensayos clínicos con el objeto de verificar si hay evidencia muestral de que un tratamiento nuevo no es significativamente inferior en eficacia al tratamiento estándar, donde el tratamiento nuevo presenta algunas ventajas sobre el tratamiento estándar como por ejemplo: tener menos efectos secundarios, ser más barato o  ser más fácil de aplicar. Un buen número de pruebas de no-inferioridad se han reportado en la literatura. Desafortunadamente, las comparaciones de las pruebas de no inferioridad reportadas hasta ahora son insatisfactorias pues se han realizado utilizando simulaciones o aproximaciones gruesas. Utilizando el concepto de “potencia media”, Martín-Andrés...
Palavras-chave: Pruebas de no-inferioridad; Potencia; Potencia media; Tamaños de prueba; Non-inferiority tests; Power; Mean power; Test size; Estadística; Doctorado.
Ano: 2013
URL: http://hdl.handle.net/10521/2185

Identidades femeninas: Proyecto de empoderamiento de mujeres, 2004, Celaya, Guanajuato
Provedor de dados: 32
Autores: Delgado Piña, Deborah.
Esta investigación hace un análisis en torno a la identidad, a partir de una  vivencia concreta: Proyecto de empoderamiento (2004).  Tiene los objetivos de  conocer el vínculo que se establece entre el empoderamiento de las mujeres y los  cambios que se suscitan en su identidad así como conocer desde su discurso, los  cambios que ellas detectan en su identidad (autoreconocimiento, autoconcepto,  autoestima). Se buscó determinar que el proyecto de Empoderamiento de  Mujeres, 2004, en Celaya, Gto. ha influido para promover cambios en la identidad  de las siete mujeres que participaron, en el plano personal, familiar y comunitario.  Las técnicas utilizadas fueron: observación, entrevista, relato de vida, test  Machover, test htp y test de la familia. El...
Tipo: Tesis
Palavras-chave: Identidad; Poder; Cambios; Programa; Proyecto; Maestría; Desarrollo Rural; Power; Identity; Changes; Program; Project.
Ano: 2008
URL: http://hdl.handle.net/10521/1291

Pruebas para la distribución exponencial con dos parámetros.
Provedor de dados: 32
Autores: Celis Euán, David Israel.
En el análisis estadístico de tiempos de vida, la distribución exponencial ha sido tomada como referencia en las áreas de Análisis de Supervivencia y teoría de Confiabilidad. En el presente trabajo se propone una prueba basada en la razón de dos estimadores insesgados del cuadrado del parámetro de escala. Para poder hacer la prueba de exponencialidad, el análisis de la prueba propuesta se divide en dos casos. Un caso se dá cuando el parámetro de localidad es cero, y el otro caso cuando ambos parámetros son desconocidos y distintos de cero. De los estudios de pruebas de exponencialidad realizadas por D’Agostino y Stephens(1984), se deduce que la prueba Cox-Oakes es de las más potentes que existen en la actualidad. Otra prueba de interés es la de Shapiro-...
Palavras-chave: Prueba estadística; Simulación Monte Carlo; Potencia; Tamaño de la prueba; Pruebas de bondad de ajuste; Goodness of fit tests; Statistical test; Monte Carlo simulation; Power; Size of the test; Maestría; Estadística.
Ano: 2012
URL: http://hdl.handle.net/10521/703

Prueba de bondad de ajuste para la distribución Gumbel para datos censurados tipo II, basada en la divergencia de Kullback-Leibler.
Provedor de dados: 32
Autores: Salinas Ruíz, Víctor.
Se propone una prueba de bondad de ajuste para la distribución Gumbel para datos censurados Tipo II. Esta prueba se basa en la metodología de discriminación de Lim &amp; Park (2007), que utilizan la Divergencia de Kullback &amp; Leibler (1951) adaptada para datos censurados Tipo II. Los valores críticos se obtuvieron mediante simulación Monte Carlo para diferentes tamaños de muestra y porcentajes de censura. La potencia y tamaño de la prueba se comparó con la prueba del Coeficiente de Correlación basado en los estimadores de Kaplan &amp; Meier (1958) y Nelson (1972) - Aalen (1978). Los resultados de la simulación, muestran que la prueba basada en la Divergencia de Kullback-Leibler es superior a las otras pruebas en términos de potencia. _______________...
Palavras-chave: Entropía; Simulación Monte Carlo; Coeficiente de Correlación; Potencia; Tamaño de la Prueba; Entropy; Monte Carlo Simulation; Correlation Coefficient; Power; Size of the test; Estadística; Maestría.
Ano: 2011
URL: http://hdl.handle.net/10521/649

Prueba de bondad de ajuste para la distribución Gumbel para datos censurados tipo II, basada en la divergencia de Kullback-Leibler.
Provedor de dados: 32
Autores: Salinas Ruíz, Víctor.
Se propone una prueba de bondad de ajuste para la distribución Gumbel para datos censurados Tipo II. Esta prueba se basa en la metodología de discriminación de Lim &amp; Park (2007), que utilizan la Divergencia de Kullback &amp; Leibler (1951) adaptada para datos censurados Tipo II. Los valores críticos se obtuvieron mediante simulación Monte Carlo para diferentes tamaños de muestra y porcentajes de censura. La potencia y tamaño de la prueba se comparó con la prueba del Coeficiente de Correlación basado en los estimadores de Kaplan &amp; Meier (1958) y Nelson (1972) - Aalen (1978). Los resultados de la simulación, muestran que la prueba basada en la Divergencia de Kullback-Leibler es superior a las otras pruebas en términos de potencia. _______________...
Palavras-chave: Entropía; Simulación Monte Carlo; Coeficiente de Correlación; Potencia; Tamaño de la Prueba; Entropy; Monte Carlo Simulation; Correlation Coefficient; Power; Size of the test; Estadística; Maestría.
Ano: 2011
URL: http://hdl.handle.net/10521/649

National REDD+ policy networks: from cooperation to conflict
Provedor de dados: 7
Autores: Brockhaus, Maria; Center for International Forestry Research; m.brockhaus@cgiar.org; Di Gregorio, Monica; University of Leeds, Sustainability Research Institute; m.digregorio@leeds.ac.uk.
Reducing emissions from deforestation and forest degradation (REDD+) is a financial mechanism aimed at providing incentives to reduce carbon emissions from forests and enhance carbon stocks. In most forest-rich developing countries, policy actors, i.e., state and nonstate as well as international and national, are designing national REDD+ policies. Actors&amp;#8217; interests and beliefs shape patterns of interactions, ranging from cooperation to conflict, and these interactions influence a country&amp;#8217;s direction and progress in REDD+ policy formulation and implementation. We used a comparative policy network approach to analyze the power structures in national REDD+ policy domains in seven countries. We drew on the typology of power structures...
Tipo: Peer-Reviewed Reports
Palavras-chave: Comparative analysis; Conflict; Cooperation; Policy networks; Power; REDD+; Social network analysis.
Ano: 2014

The power problematic: exploring the uncertain terrains of political ecology and the resilience framework
Provedor de dados: 7
Autores: Ingalls, Micah L; Poverty-Environment Initiative, United Nations Development Programme; Human Dimensions Research Unit, Department of Natural Resources, Cornell University; mli6@cornell.edu; Stedman, Richard C; Human Dimensions Research Unit, Department of Natural Resources, Cornell University; rcs6@cornell.edu.
Significant and growing concerns relating to global social and environmental conditions and processes have raised deep questions relating to the ability of traditional governance regimes to manage for the complexities of social-ecological systems. The resilience framework provides a more dynamic approach to system analysis and management, emphasizing nonlinearity, feedbacks, and multiscalar engagement along the social-ecological nexus. In recent years, however, a number of scholars and practitioners have noted various insufficiencies in the formulation of the resilience framework, including its lack of engagement with the dimensions of power within social-ecological systems, which blunt the analytical potential of resilience and run the risk of undermining...
Tipo: Peer-Reviewed Synthesis
Palavras-chave: Political ecology; Power; Resilience; Social-ecological systems.
Ano: 2016

People, Power, and the Coast: a Conceptual Framework for Understanding and Implementing Benefit Sharing
Provedor de dados: 7
Autores: Wynberg, Rachel; Environmental Evaluation Unit, Department of Environmental and Geographical Science, University of Cape Town; rachel.wynberg@uct.ac.za; Hauck, Maria; Environmental Evaluation Unit, Department of Environmental and Geographical Science, University of Cape Town; MHauck4@gmail.com.
The concept of benefit sharing has seen growing adoption in recent years by a variety of sectors. However, its conceptual underpinnings, definitions, and framework remain poorly articulated and developed. We aim to help address this gap by presenting a new conceptual approach for enhancing understanding about benefit sharing and its implementation. We use the coast as a lens through which the analysis is framed because of the intricate governance challenges which coastal social&amp;#8211;ecological systems present, the increasing development and exploitation pressures on these systems, and the growing need to improve understanding about the way in which greater equity and reduced inequalities could reduce conflicts, protect coastal ecosystems, and ensure...
Tipo: Peer-Reviewed Synthesis
Palavras-chave: Coastal communities; Governance; Inequality; Power.
Ano: 2014

Mismatch Between Scales of Knowledge in Nepalese Forestry: Epistemology, Power, and Policy Implications
Provedor de dados: 7
Autores: Ahlborg, Helene; Environmental Systems Analysis, Chalmers University of Technology; helene.ahlborg@chalmers.se; Nightingale, Andrea J.; Institute of Geography and the Lived Environment, School of GeoSciences, University of Edinburgh; School of Global Studies, University of Gothenburgh; andrea.nightingale@ed.ac.uk.
Tipo: Peer-Reviewed Reports
Palavras-chave: Community forestry; Knowledge scales; Natural resource management; Nepal; Power; Scale.
Ano: 2012

REDD+ policy networks: exploring actors and power structures in an emerging policy domain
Provedor de dados: 7
Autores: Brockhaus, Maria; Center for International Forestry Research; m.brockhaus@cgiar.org; Di Gregorio, Monica; University of Leeds, Sustainability Research Institute; m.digregorio@leeds.ac.uk; Carmenta, Rachel; Center for International Forestry Research; R.Carmenta@cgiar.org.
Policy making is often neither rational nor solution-oriented, but driven by negotiations of interests of multiple actors that increasingly tend to take place in policy networks. Such policy networks integrate societal actors beyond the state, which all aim, to different degrees, at influencing ongoing policy processes and outcomes. Reducing Emissions from Deforestation and Forest Degradation (REDD+) can be considered as such an emerging policy domain, in which actors cooperate and conflict in network structures, build coalitions and try to control information and finance flows relevant for REDD+ decision making. This special feature is the result of an extensive comparative research effort to investigate national level REDD+ policy processes and emerging...
Tipo: Peer-Reviewed Synthesis
Palavras-chave: Agency; Climate change; Comparative analysis; Discourse coalitions; Policy network analysis; Power; REDD+; SNA; Transformational change.
Ano: 2014

Power Asymmetries in Small-Scale Fisheries: a Barrier to Governance Transformability?
Provedor de dados: 7
Autores: Crona, Beatrice; Stockholm Resilience Center, Stockholm University, Sweden; beatrice.crona@stockholmresilience.su.se.
Both global and local environmental problems call for the transformation of many contemporary and unsustainable governance approaches. Therefore, recent interest has sprung up around factors that facilitate and hinder societies from transforming governance of natural resources. Using a social-network approach, we study links between informal power structures and knowledge sharing and consensus building. We examine how this interaction may have affected the (in)ability of a community to move from open-access to some form of collective action for resource management. Individuals occupying central positions in a knowledge network can be instrumental in determining which knowledge and interpretation of ecological signals is most dominant. If the same...
Tipo: Peer-Reviewed Reports
Palavras-chave: Comanagement; Governance; Local ecological knowledge; Natural resources; Power; Social networks; Transformation.
Ano: 2010

An Integrated Approach to Analyzing (Adaptive) Comanagement Using the &amp;#8220;Politicized&amp;#8221; IAD Framework
Provedor de dados: 7
Autores: Whaley, Luke; Water Science Institute, Cranfield University; l.whaley@cranfield.ac.uk; Weatherhead, Edward K.; Water Science Institute, Cranfield University; k.weatherhead@cranfield.ac.uk.
Scholars of comanagement are faced with a difficult methodological challenge. As comanagement has evolved and diversified it has increasingly merged with the field of adaptive management and related concepts that derive from resilience thinking and complex adaptive systems theory. In addition to earlier considerations of power sharing, institution building, and trust, the adaptive turn in comanagement has brought attention to the process of social learning and a focus on concepts such as scale, self-organization, and system trajectory. At the same time, a number of scholars are calling for a more integrated approach to studying (adaptive) comanagement that is able to situate these normative concepts within a critical understanding of how context and power...
Tipo: Peer-Reviewed Synthesis
Palavras-chave: Comanagement; Adaptive comanagement; IAD Framework; Politicized IAD Framework; Methodology; Institutions; Power; Discourse; Resilience.
Ano: 2014

Governance of Aquatic Agricultural Systems: Analyzing Representation, Power, and Accountability
Provedor de dados: 7
Autores: Ratner, Blake D.; WorldFish; b.ratner@cgiar.org; Cohen, Philippa; ARC Centre of Excellence for Coral Reef Studies, James Cook University; WorldFish; p.cohen@cgiar.org; Barman, Benoy; WorldFish; b.barman@cgiar.org; Mam, Kosal; WorldFish; k.mam@cgiar.org; Nagoli, Joseph; WorldFish; j.nagoli@cgiar.org; Allison, Edward H.; School of International Development, University of East Anglia; WorldFish; e.allison@cgiar.org.
Aquatic agricultural systems in developing countries face increasing competition from multiple stakeholders over rights to access and use natural resources, land, water, wetlands, and fisheries, essential to rural livelihoods.  A key implication is the need to strengthen governance to enable equitable decision making amidst competition that spans sectors and scales, building capacities for resilience, and for transformations in institutions that perpetuate poverty.  In this paper we provide a simple framework to analyze the governance context for aquatic agricultural system development focused on three dimensions: stakeholder representation, distribution of power, and mechanisms of accountability.  Case studies from Cambodia, Bangladesh, Malawi/Mozambique,...
Tipo: Peer-Reviewed Reports
Palavras-chave: Accountability; Bangladesh; Cambodia; Civil society; Coastal zone management; Environmental governance; Livelihoods; Malawi; Mozambique; Power; Social-ecological resilience; Solomon Islands; Stakeholder representation; Wetlands.
Ano: 2013

Evaluating Responses in Complex Adaptive Systems: Insights on Water Management from the Southern African Millennium Ecosystem Assessment (SAfMA)
Provedor de dados: 7
Autores: Bohensky, Erin; University of Pretoria; ebohensky@zoology.up.ac.za; Lynam, Timothy; University of Zimbabwe; tlynam@science.uz.ac.zw.
Ecosystem services are embedded in complex adaptive systems. These systems are riddled with nonlinearities, uncertainties, and surprises, and are made increasingly complex by the many human responses to problems or changes arising within them. In this paper we attempt to determine whether there are certain factors that characterize effective responses in complex systems. We construct a framework for response evaluation with three interconnected scopes or spatial and temporal domains: the scope of an impact, the scope of the awareness of the impact, and the scope of the power or influence to respond. Drawing from the experience of the Southern African Millennium Ecosystem Assessment (SAfMA), we explore the applicability of this framework to the example of...
Tipo: Peer-Reviewed Reports
Palavras-chave: Responses; Complex adaptive systems; Ecosystem services; Southern Africa; Water management; Impact; Awareness; Power.
Ano: 2005

The Political Economy of Cross-Scale Networks in Resource Co-Management
Provedor de dados: 7
Autores: Adger, W. Neil; Tyndall Centre for Climate Change Research; n.adger@uea.ac.uk; Brown, Katrina; University of East Anglia; k.brown@uea.ac.uk; Tompkins, Emma L.; University of East Anglia; e.tompkins@uea.ac.uk.
We investigate linkages between stakeholders in resource management that occur at different spatial and institutional levels and identify the winners and losers in such interactions. So-called cross-scale interactions emerge because of the benefits to individual stakeholder groups in undertaking them or the high costs of not undertaking them. Hence there are uneven gains from cross-scale interactions that are themselves an integral part of social-ecological system governance. The political economy framework outlined here suggests that the determinants of the emergence of cross-scale interactions are the exercise of relative power between stakeholders and their costs of accessing and creating linkages. Cross-scale interactions by powerful stakeholders have...
Tipo: Peer-Reviewed Insight
Palavras-chave: Caribbean; Institutions; Marine protected areas; Natural resource management; Power; Social-ecological resilience; Transaction costs.
Ano: 2005

Conceptualizing power to study social-ecological interactions
Provedor de dados: 7
Autores: Boonstra, Wiebren J; Stockholm Resilience Centre, Stockholm University; wijnand.boonstra@su.se.
My aim is to conceptualize power using social science theory and to demonstrate why and how the concept of power can complement resilience studies and other analyses of social-ecological interaction. Social power as a scientific concept refers to the ability to influence both conduct and context. These two dimensions of power (conduct and context) can be observed by differentiating between various sources of power, including, for example, technology or mental power. The relevance of the conceptualization of power presented here is illustrated with the example of fire as a source of social-ecological power. I conclude by discussing how attention to power can help to address issues of social justice and responsibility in social-ecological interactions.
Tipo: Peer-Reviewed Synthesis
Palavras-chave: Fire domestication; Power; Resilience; Social responsibility; Social-ecological interactions; Sociology.
Ano: 2016

Social-ecological systems, social diversity, and power: insights from anthropology and political ecology
Provedor de dados: 7
Autores: Fabinyi, Michael; Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University; michael.fabinyi@jcu.edu.au; Evans, Louisa; Geography, College of Life and Environmental Sciences, University of Exeter; louisa.evans@exeter.ac.uk; Foale, Simon J; Department of Anthropology, Archaeology and Sociology, James Cook University; simon.foale@jcu.edu.au.
A social-ecological system (SES) framework increasingly underpins the &amp;#8220;resilience paradigm.&amp;#8221; As with all models, the SES comes with particular biases. We explore these key biases. We critically examine how the SES resilience literature has attempted to define and analyze the social arena. We argue that much SES literature defines people&amp;#8217;s interests and livelihoods as concerned primarily with the environment, and thereby underplays the role of other motivations and social institutions. We also highlight the SES resilience literature&amp;#8217;s focus on institutions and organized social units, which misses key aspects of social diversity and power. Our key premise is the importance of inter- and multi-disciplinary perspectives....
Tipo: Peer-Reviewed Synthesis
Palavras-chave: Anthropology; Political ecology; Power; Social diversity; Social-ecological system.
Ano: 2014

From Resilience to Transformation:  the Adaptive Cycle in Two Mexican Urban Centers
Provedor de dados: 7
Autores: Pelling, Mark; King's College London; mark.pelling@kcl.ac.uk; Manuel-Navarrete, David; King's College London; david.manuel_navarrete@kcl.ac.uk.
Tipo: Peer-Reviewed Reports
Palavras-chave: Adaptive cycle; Climate change; Disaster management; Mexico; Power; Resilience; Transformation.
Ano: 2011

Probing the interfaces between the social sciences and social-ecological resilience: insights from integrative and hybrid perspectives in the social sciences
Provedor de dados: 7
Autores: Stone-Jovicich, Samantha; CSIRO Land and Water Flagship, Adaptive Social and Economic Sciences Program; samantha.stone-jovicich@csiro.au.
Social scientists, and scholars in related interdisciplinary fields, have critiqued resilience thinking&amp;#8217;s oversimplification of social dimensions of coupled social-ecological systems. Resilience scholars have countered with &amp;#8220;where is the ecology&amp;#8221; in social analyses? My aim is to contribute to current efforts to strengthen inter- and transdisciplinary debate and inquiry between the social-ecological resilience community and the social sciences. I synthesize three social science perspectives, which stress the complex, dynamic, and multiscalar interconnections between the biophysical and social realms in explaining social-environmental change, and which place both the social and ecology centre stage in their analyses:...
Tipo: Peer-Reviewed Synthesis
Palavras-chave: Actor-network theory; Agency; ANT; Human-environment relations; Hybrid perspectives; Interdisciplinary; Normative issues; Political ecology; Power; Social-ecological resilience; Social-ecological systems; Social sciences; Social systems; Transdisciplinary; World systems analysis.
Ano: 2015

Equity, Power Games, and Legitimacy: Dilemmas of Participatory Natural Resource Management
Provedor de dados: 7
Autores: Barnaud, Cecile; INRA, UMR1201 DYNAFOR; Toulouse University, INPT-ENSAT; Toulouse University, INPT EI Purpan   ; cecile.barnaud@toulouse.inra.fr; Van Paassen, Annemarie; Knowledge, Technology and Innovation Group, Wageningen University;.
Tipo: Peer-Reviewed Reports
Palavras-chave: Critical systems; Inequity; Participatory approach; Power; Reflexivity; Transdisciplinarity.
Ano: 2013

Multistakeholder environmental governance in action: REDD+ discourse coalitions in Tanzania
Provedor de dados: 7
Autores: Rantala, Salla; University of Helsinki; University of Eastern Finland; salla.rantala@helsinki.fi; Di Gregorio, Monica ; University of Leeds; M.DiGregorio@leeds.ac.uk.
Balancing interests to achieve legitimate and effective policies is a primary and pressing challenge in countries&amp;#8217; efforts to prepare their national reducing emissions from deforestation and forest degradation (REDD+) strategies. Using Tanzania as a country case, we investigated the most polarizing policy discourses and assessed the influence of competing discourse coalitions on the drafting of the national REDD+ strategy. We combined discourse and social network analysis to identify discourse coalitions and assess their influence. The findings indicate that the national REDD+ strategy largely reflects the positions of the discourse coalition that is controlled by powerful state actors who support central control of REDD+ financial mechanisms....
Tipo: Peer-Reviewed Reports
Palavras-chave: Discourse coalitions; Power; REDD+; Social network analysis; Tanzania.
Ano: 2014

Pausing at the Brink of Interdisciplinarity: Power and Knowledge at the Meeting of Social and Biophysical Science
Provedor de dados: 7
Autores: MacMynowski, Dena P; Stanford University; macmynowski@stanford.edu.
Interdisciplinary environmental research has been deemed essential to addressing the dynamics of coupled social-biophysical systems. Although decades of scholarship in science and technology studies (STS) take the analysis of interdisciplinarity out of the realm of anecdote, there is almost no overlap between this literature and discussions of interdisciplinarity in ecology-oriented journals. The goals of researchers in these areas are quite different, and thus far, their analyses of interdisciplinarity have been incommensurate with each other's purposes. To introduce an STS perspective into how environmental scientists think about interdisciplinarity, I argue that biophysical and social scientists are not just bringing information and different...
Tipo: Peer-Reviewed Synthesis
Palavras-chave: Interdisciplinarity; Philosophy of science; Power; Power/knowledge; Social-biophysical systems; Research methods; Transdisciplinarity.
Ano: 2007

Frames of Scale Challenges in Finnish and Greek Biodiversity Conservation
Provedor de dados: 7
Autores: Apostolopoulou, Evangelia; Department of Ecology, School of Biology, Aristotle University of Thessaloniki ; evaposto@bio.auth.gr; Paloniemi, Riikka ; Environmental Policy Centre, Finnish Environment Institute (SYKE); riikka.paloniemi@ymparisto.fi.
Global conservation expansion has been associated with significant changes in cross-scale interactions and in the discourses surrounding them engendering new scale challenges in the field of biodiversity conservation. In this paper, we analyze frames of scale challenges by drawing on evidence from eight focus groups of stakeholders and scientists from Greece and Finland. By following a systematic frame analysis we found three dominant frames. First, framing scale challenges as mainly derived from knowledge gaps regarding ecological scale emphasizes the scale problems occurring when only limited consideration is given to the scale-dependence of ecological phenomena. This prioritizes the formulation of scientifically informed conservation policies,...
Tipo: Peer-Reviewed Reports
Palavras-chave: Biodiversity governance; Conservation areas; Fit; Frames; Learning; Mismatch; Power; Scale.
Ano: 2012

From coastal timber supply area to Great Bear Rainforest: exploring power in a social&amp;#8211;ecological governance innovation.
Provedor de dados: 7
Autores: Moore, Michele-Lee; University of Victoria; mlmoore@uvic.ca; Tjornbo, Ola; SiG@Waterloo, University of Waterloo; ola.tjornbo@gmail.com.
As the 2005 Millennium Ecosystem Assessment revealed, many social&amp;#8211;ecological systems around the world are currently being governed unsustainably. Consequently, social innovation is needed to transform current governance regimes and introduce new more resilient arrangements. Although dominant institutions and social groups may resist such innovations which threaten the status quo and their interests, groups on the margins of the established social order can often trigger governance transformations, despite a lack of conventional financial and institutional resources. In particular, there are numerous cases of marginalized groups initiating processes of radical change to establish sustainable governance practices for threatened...
Tipo: Peer-Reviewed Reports
Palavras-chave: Governance transformation; Great Bear Rainforest; Power; Social innovation.
Ano: 2012

Spanning Boundaries in an Arizona Watershed Partnership: Information Networks as Tools for Entrenchment or Ties for Collaboration?
Provedor de dados: 7
Autores: Cutts, Bethany B. ; School of Life Sciences, Arizona State University; Decision Center for a Desert City, Arizona State University; bcutts@asu.edu; Larson, Elisabeth K. ; School of Life Sciences, Arizona State University; eklarson@asu.edu; Darby, Kate J.; School of Human Evolution and Social Change, Arizona State University; Kate.Darby@asu.edu; Neff, Mark; Consortium for Science, Policy and Outcomes, Arizona State University ; Mark.Neff@asu.edu; Wutich, Amber; School of Human Evolution and Social Change, Arizona State University; Amber.Wutich@asu.edu; Bolin, Bob; School of Human Evolution and Social Change, Arizona State University; Bob.Bolin@asu.edu.
The need to develop successful collaborative strategies is an enduring problem in sustainable resource management. Our goal is to evaluate the relationship between information networks and conflict in the context of collaborative groundwater management in the rapidly growing central highland region of Arizona. In this region, water-management conflicts have emerged because of stakeholders&amp;#8217; differing geographic perspectives and competing scientific claims. Using social network analyses, we explored the extent to which the Verde River Basin Partnership (VRBP), which was charged with developing and sharing scientific information, has contributed to collaboration in the region. To accomplish this, we examined the role that this stakeholder...
Tipo: Peer-Reviewed Reports
Palavras-chave: Arizona; Boundary spanning; Collaborative management; Environmental governance; Information networks; Power; Water management.
Ano: 2010

Information networks and power: confronting the "wicked problem" of REDD+ in Indonesia
Provedor de dados: 7
Autores: Moeliono, Moira; Center for International Forestry Research; M.Moeliono@cgiar.org; Gallemore, Caleb; University of Ohio, Center for International Forestry Research; caleb.gallemore@gmail.com; Santoso, Levania; Center for International Forestry Research; L.Santoso@cgiar.org; Brockhaus, Maria; Center for International Forestry Research; m.brockhaus@cgiar.org; Di Gregorio, Monica; Sustainability Research Institute, University of Leeds; M.DiGregorio@leeds.ac.uk.
Reducing Emissions from Deforestation and Forest Degradation (REDD+) is a priority issue for forest and climate policy in Indonesia, and REDD+ policy-making activity has been characterized by considerable public consultation. Despite this engagement, discussions on REDD+ in Indonesia are reported to have remained top-down, a disconcerting pattern when adaptive governance and transformational change require cross-scale and cross-sectoral communication. Explicitly modeling the patterns of information exchange related to REDD+ can clarify these claims and help identify potential barriers to the transformational change needed to implement REDD+. We used data obtained through semistructured and structured interviews held in 2011 with representatives from a...
Tipo: Peer-Reviewed Reports
Palavras-chave: Indonesia; Information exchange; Natural resource governance; Power; REDD+; Social network analysis.
Ano: 2014

DESIGN OF ELECTRONIC CONTROL GOVERNOR FOR A SINGLE CYLINDER GASOLINE ENGINE BASED ON AN INTELLIGENT SENSING ALGORITHM
Provedor de dados: 70
Autores: Sun,Lixiang; Yang,Yan; Ma,Fang; Jing,Wen; Zheng,Yibo; Wu,Hao.
ABSTRACT At present, most large machinery and vehicle engines are electronically controlled but their electronic control systems are too expensive to be popularised and applied in small gasoline engines with relatively low prices. Therefore, small gasoline engines still use mechanical speed regulators. Mechanical speed regulators not only have the defects of inertia lag, friction resistance, inherent speed regulation and the like, but also have the disadvantage that dynamic performance and steady performance cannot be combined, which is not suitable for the increasingly improved speed regulation performance of gasoline engines. This paper describes the design of an electronically controlled intelligent governor for small gasoline engines. Starting from a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electronic control; Intelligent perception; Dynamic and steady state performance; Power; Hunting.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000400495

Perfomance evaluation of a direct injection engine using different blends of soybean (Glycine max) methyl biodiesel
Provedor de dados: 70
Autores: Nietiedt,Gustavo H.; Schlosser,José F.; Russini,Alexandre; Frantz,Ulisses G.; Ribas,Rodrigo L.
Diesel fuel is used widely in Brazil and worldwide. On the other hand, the growing environmental awareness leads to a greater demand for renewable energy resources. Thus, this study aimed to evaluate the use of different blends of soybean (Glycine max) methyl biodiesel and diesel in an ignition compression engine with direct injection fuel. The tests were performed on an electric eddy current dynamometer, using the blends B10, B50 and B100, with 10; 50 e 100% of biodiesel, respectively, in comparison to the commercial diesel B5, with 5% of biodiesel added to the fossil diesel. The engine performance was analyzed trough the tractor power take off (PTO) for each fuel, and the best results obtained for the power and the specific fuel consumption,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dynamometer; Power; Specific consumption.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000500009

PERFORMANCE OF AN AGRICULTURAL DIESEL ENGINE USING DIFFERENTS FUELS
Provedor de dados: 70
Autores: Perin,Gismael F.; Schlosser,José F.; Galon,Leandro; Rodrigues,Fabrício A.; Frantz,Ulisses G.
ABSTRACT The use of fuels for agricultural Diesel engines cycle, both of mineral origin (Diesel) or vegetable and animal origin (biodiesel) can significantly alter its performance. Therefore, the aim of this study was to quantify the change in torque, power and consumption of agricultural Diesel engine fuel using minerals and vegetables fuels. It was used a tractor power take-off coupled to a magnetic brake dynamometer (for measuring speed and torque for subsequent calculation of power), and a flow meter (for measuring the hourly fuel consumption and specific fuel consumption calculation). Eleven different fuels (S10 mineral diesel with 5%, 10%, 15%, 20% and 50% biodiesel and mineral diesel S500 with 5%, 10%, 15%, 20% and 50% biodiesel, have been used pure...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Test; Dynamometer; Tractor; Torque; Power.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000100091

Bringing ‘Deep Knowledge’ of Fisheries into Marine Spatial Planning
Provedor de dados: 5
Autores: Said, Alicia; Trouillet, Brice.
In marine spatial planning (MSP), the production of knowledge about marine-based activities is fundamental because it informs the process through which policies delineating the use of space are created and maintained. This paper revises our view of knowledge—developed during the mapping and planning processes—as the undisputed factual basis on which policy is developed. Rather, it argues that the construction, management, validation, and marginalisation of different types of knowledge stemming from different stakeholders or disciplinary approaches is at the heart of policy and planning processes. Using the case of fisheries-generated knowledge in the implementation of MSP, we contend that the fisheries data informing the MSP process are still very much...
Tipo: Text
Palavras-chave: Knowledge; Power; Co-production; Spatial planning; Fisheries; Data model; Technical considerations; Political scrutiny.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00652/76386/77397.pdf

Collective Action and Property Rights for Poverty Reduction: A Review of Methods and Approaches
Provedor de dados: 31
Autores: Mwangi,   Esther; Markelova,   Helen.
While much attention has been given to examining various aspects of poverty, a number of studies have shown that institutional environment in which the poor exist conditions welfare outcomes, thus highlighting the inherently crucial importance of institutions for poverty reduction. The institutions of property rights and collective action are among those identified as playing a major role in the livelihood strategies of the poor. This paper highlights ways to operationalize the conceptual framework developed by Di Gregorio and colleagues (2008), which provides an analytical tool to study poverty through the institutional lens with a special focus on collective action and property rights. By emphasizing the multidimensionality of poverty, the authors...
Tipo: Conference Paper or Presentation
Palavras-chave: Collective action; Property rights; Poverty reduction; Evaluation; Vulnerability; Power; Institutions; Wellbeing; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/44355

Power Struggle in the Food Chain? Lessons from Empirical Studies on Power Influences in Chains and Marketing Channels
Provedor de dados: 31
Autores: Belaya,   Vera; Hanf,   Jon Henrich.
Power plays a key role in any chain relationship. In the past large manufacturers such as Unilever and Nestle were the most dominant players in the chain. However, as a result of consolidation among retailers, power has shifted towards retailers. Nowadays such retailers as Wal-Mart, Carrefour, and Tesco are seen as powerful gatekeepers controlling the access to the end consumer. Moreover, branded manufacturers and large multinational retailers become increasingly dependent on fewer and larger suppliers who can deliver high quality products at competitive prices. Since many decades there is discussion going on about the role of power in chains and marketing channels. In order to understand how power and its interactions with other constructs in the chain...
Tipo: Conference Paper or Presentation
Palavras-chave: Power; Power Conceptualization; Supply Chain; Supply Chain Network; Marketing.
Ano: 2009
URL: http://purl.umn.edu/57981

Sample size and power calculations using the noncentral t-distribution
Provedor de dados: 31
Autores: Harrison,   David A.; Brady,   Anthony R.
The standard formulas for sample size and power calculation, as implemented in the command sampsi, make use of a normal approximation to the t-distribution. When the sample sizes are small, this approximation is poor, resulting in overestimating power (or underestimating sample size). One particular situation in which this is likely to be important is the field of cluster randomized trials. Although the total number of individuals in a cluster randomized trial may be large, the number of clusters will often be small. We present a simulation study from the design of a cluster randomized crossover trial that motivated this work and a command to perform more accurate sample size and power calculations based on the noncentral t-distribution.
Tipo: Journal Article
Palavras-chave: Sampncti; Sample size; Power; Noncentral t-distribution; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116234

Transfer of Institutions: Actors and Constraints - The Russian Case in a Global Context
Provedor de dados: 31
Autores: Oleinik,   Anton.
Modernity is usually thought as a complex society with clearly differentiated spheres of everyday life. It means, in particular, that economic rules do not interfere with the norms structuring political, social, scientific and other interactions. The complex, differentiated society sharply contrasts with a "small" and homogeneous "pre-modern" society. The process of modernization, i.e. differentiation of the spheres of everyday life, can take various forms. In an advanced country it relies on internal forces. Modernization in this context looks like an evolutionary, "bottom-up" development. In a backward country (Russia and Germany in the first half of the 20th century), modernization requires a strong governmental (from the top to the bottom)...
Tipo: Working or Discussion Paper
Palavras-chave: State bureaucracy; Economic backwardness; Catch-up modernization; Conservative modernization; Opportunism; Institutional constraints; Power; Authority; Invidious comparison; Institutional importation; Democracy; Shared mental model; Institutional and Behavioral Economics; A13; A14; B15; B25; B52; D73; H83; K42; N40; O17; P21; P37; P51.
Ano: 2005
URL: http://purl.umn.edu/26333

Power and Supply Chain Management - Insights from Russia
Provedor de dados: 31
Autores: Belaya,   Vera; Hanf,   Jon Henrich.
The research topic of power relationships has been receiving increasingly more attention lately. However, only a few scientific works have studied power in the context of supply chain management. In this regard, intriguing research questions arise of how to distinguish among and deal with negative and positive effects of power in order to avoid problems and use power as an effective tool for supply chain management appear to be an important one. An important challenge, therefore, is to find out what role power plays in supply chain networks and how it affects supply chain management with specific attention to coordination and cooperation, and whether power can be utilized as a tool to promote the overall supply chain effectiveness. Therefore, the aim of...
Tipo: Conference Paper or Presentation
Palavras-chave: Power; Agri-Food Supply Chains; Supply Chain Management; Russia; Agribusiness; Agricultural and Food Policy.
Ano: 2011
URL: http://purl.umn.edu/114483

A COORDENAÇÃO AGROINDUSTRIAL CITRICOLA BRASILEIRA E OS NOVOS RECURSOS DE PODER: DOS POLITICOS AOS JURIDICOS
Provedor de dados: 31
Autores: Paulillo,   Luiz Fernando; Almeida,   Luiz Manoel de Moraes Camargo.
This work shows that the political and legal resources available to citrus farmers have become as strategic as financial, technological and organizational resources. The study presents an analysis of the Brazilian citrus business governance, which is defined by the use of different strategies among citrus farmers and processing plants: the citrus farmers and their main association use political resources, while some big juice processing plants resort to legal resources. This opposition represents a new obstacle to the achievement of positive results by citrus farmers in the current power network. Court orders demonstrate that orange supply contracts have become a fundamental empowering instrument in the sector, leading to strategic gains for the juice...
Tipo: Journal Article
Palavras-chave: Citrus farmers; Power; Resources; Juice processing plants; Citrus business governance; Agribusiness; Agricultural Finance; Industrial Organization.
Ano: 2009
URL: http://purl.umn.edu/62142

Saberes, poderes e os dilemas das relações socioambientais
Provedor de dados: 31
Autores: Naves,   Flavia Luciana.
In the last years the expression environment and the concern in relation to it became common. However, the environmental question, nowadays a social and sociological problem, has been constructed along human history, gaining new and different aspects and leading to different types of conflicts. Under an apparent “consensus” about the importance of the environment there are power conflicts to define, among others, the meaning of environment, the origin and solutions of the environmental problems and the forms of relations between society and nature, which influence the entire functioning of the society. A first step to advance in the discussion about this theme may be understanding that environment or nature is not so “natural”. Therefore, we propose to...
Tipo: Journal Article
Palavras-chave: Social-environmental relations; Conflicts; Power.
Ano: 2004
URL: http://purl.umn.edu/43694

Power by simulation
Provedor de dados: 31
Autores: Feiveson,   A.H.
This paper describes how to write Stata programs to estimate the power of virtually any statistical test that Stata can perform. Examples given include the t test, Poisson regression, Cox regression, and the nonparametric rank-sum test.
Tipo: Journal Article
Palavras-chave: Power; Simulation; Random number generation; Postfile; Copula; Sample size; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115955

Property Rights, Collective Action, and Poverty: The Role of Institutions for Poverty Reduction
Provedor de dados: 31
Autores: di Gregorio,   Monica; Hagedorn,   Konrad; Kirk,   Michael; Korf,   Benedikt; McCarthy,   Nancy; Meinzen-Dick,   Ruth Suseela; Swallow,   Brent M.
This paper presents a conceptual framework on how institutions of property rights and collective action can contribute to poverty reduction, including through external interventions and action by poor people themselves. The first part of the paper examines the initial conditions of poverty, highlighting the role of assets, risks and vulnerability, legal structures and power relations. The latter part investigates the decision-making dynamics of actors—both poor and non-poor—and how they can use the tangible and intangible resources they have to shape their livelihoods and the institutions that govern their lives. The paper concludes with a discussion of how attention to property rights and collective action can improve the understanding of outcomes in...
Tipo: Conference Paper or Presentation
Palavras-chave: Collective action; Property rights; Poverty reduction; Conceptual framework; Vulnerability; Power; Institutions; Wellbeing; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/44354

A menu-driven facility for complex sample size calculation in randomized controlled trials with a survival or a binary outcome: Update
Provedor de dados: 31
Autores: Barthel,   Friederike Maria-Sophie; Royston,   Patrick; Babiker,   Abdel.
Royston and Babiker (2002) presented a menu-driven Stata program for the calculation of sample size or power for complex clinical trial designs under a survival time or binary outcome. In the present article, the package is updated to Stata 8 under the new name ART. Furthermore, the program has been extended to incorporate noninferiority designs and provides more detailed output. This package is the only realistic sample size tool for survival studies available in Stata.
Tipo: Journal Article
Palavras-chave: Sample size; Power; Randomized controlled trial; Multiarm designs; Survival analysis; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117503

Toward a New Definition of Community Partnership: A Three-Dimensional Approach
Provedor de dados: 31
Autores: Shemer,   Orna; Schmid,   Hillel.
We propose a new definition of partnership, which emphasizes the role and meaning of power in creating partnership. Following a case study of change processes within a kibbutz community undergoing lifestyle changes, The proposed definition focuses on three dimensions of partnership: (a) the overt dimension, in which partnership is manifested through daily community life such as organizational structure, rules and norms; (b) the covert dimension, which focuses on symbolic rites of partnership and "non-events"; (c) the latent dimension, which expresses internalized partnership and influences participants' consciousness through socialization and world views.
Tipo: Journal Article
Palavras-chave: Partnership; Community partnership; Power; Decision-making processes; Kibbutz; Community/Rural/Urban Development.
Ano: 2007
URL: http://purl.umn.edu/58685

Generalized power calculations for generalized linear models and more
Provedor de dados: 31
Autores: Newson,   Roger.
The powercal command can compute any one of the five quantities involved in power calculations from the other four. These quantities are power, significance level, detectable difference, sample number, and the standard deviation (SD) of the influence function, which is equal to the standard error multiplied by the square root of the sample number. powercal can take arbitrary expressions (involving constants, scalars, or variables) as input and calculate the output as a new variable. The user can therefore plot input variables against output variables, and this often communicates the tradeoffs involved better than a point calculation as output by the sampsi command. General formulas are given for calculating the SD of the influence function when the...
Tipo: Journal Article
Palavras-chave: Powercal; Power; Alpha; Significance level; Detectable difference; Detectable ratio; Sample number; Standard deviation; Influence function; Sample design; Generalized linear model; Proportion; Arithmetic mean; Algebraic mean; Geometric mean; Odds; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116258

THE “DARK” AND THE “BRIGHT” SIDES OF POWER IN SUPPLY CHAIN NETWORKS
Provedor de dados: 31
Autores: Belaya,   Vera; Hanf,   Jon Henrich.
One of the prerequisites for a supply chain network is the existence of a focal company, which possesses power to coordinate the network in order to realize its strategic objectives. Power represents one of the major elements of the supply chain management and seems to have been treated in the literature in contrasting ways from the two sides “dark” and “bright”. Using literature review we examine how these sides of power affect supply chain management from the viewpoint of the focal company with specific attention to coordination and cooperation issues and whether it can be used as a tool to promote the overall supply chain effectiveness.
Tipo: Conference Paper or Presentation
Palavras-chave: Supply Chain Networks; Supply Chain Management; Power; Focal Company; Agribusiness.
Ano: 2008
URL: http://purl.umn.edu/52653

DIMENSIONES CULTURALES EN LA EMPRESA ESTATAL DE AUTOSERVICIO, SUCURSAL DELICIAS, CHIHUAHUA
Provedor de dados: 31
Autores: Quiroz Guzman,   Tamara; Valtierrez Angel,   David Arnoldo.
The branch of the supermarkets is seen threatened each day by radical changes and sometimes involuntary those which should be faced in a way practical and direct as if is tried to minority problems. Furthermore, as all in the life changes and evolves, the market is not left behind being this obligator to improve their/its continuous improvement strategies to reach the excellence and the permanency before the competition every time but direct. The present study is carried out in the state self-service company in Delicias City, Chihuahua, who requested the one which anonymity devotes to the foods and products marketing for household. It is I accomplished a study that consisted of measuring the cultural dimensions of the groups that meet in Delicias and the...
Tipo: Journal Article
Palavras-chave: Cultural dimensions; Uncertainty; Power; Womanliness; Masculinity; Collectivism; Individualism; Society.; Agribusiness.
Ano: 2010
URL: http://purl.umn.edu/93906

Recognizing the Links between Power and Trust in Managing Supply Chain Relationships
Provedor de dados: 31
Autores: Belaya,   Vera; Torok,   T.; Hanf,   Jon Henrich.
In order to manage supply chain relationships effectively both aspects - the need to align the actions in order to coordinate the network and the alignment of interests of cooperating actors – are important. Therefore, the coexistence of both cooperative and competitive constructs should be recognized, where power coexists alongside with trust. Many scientific works have been written on power and trust as constructs of business-to-business relationships separately. However, most of the existing relationship marketing literature studies power and trust in relation to conflict or satisfaction, and the link between power and trust in the supply chain context appears to be largely ignored as a research topic. Some scientists assert that power negates...
Tipo: Conference Paper or Presentation
Palavras-chave: Power; Trust; Supply Chain Relationships.; Agribusiness.
Ano: 2008
URL: http://purl.umn.edu/43925

From the help desk: It's all about the sampling
Provedor de dados: 31
Autores: McDowell,   Allen; Pitblado,   Jeffrey S.
Effective estimation and inference, when the data are collected using complex survey designs, requires estimators that fully account for the sampling design. This article explores, by means of Monte Carlo simulations of the power of simple hypothesis tests, the consequences of parameter estimation and inference when naive estimators are employed with survey data.
Tipo: Journal Article
Palavras-chave: Cluster; Design; Power; Strata; Svy; Svymean; Svyset; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115961

Sample size calculations for main effects and interactions in case–control studies using Stata's nchi2 and npnchi2 functions
Provedor de dados: 31
Autores: Saunders,   Catherine L.; Bishop,   D. Timothy; Barrett,   Jennifer H.
The non-central chi-squared distribution can be used to calculate power for tests detecting departure from a null hypothesis. Required sample size can also be calculated because it is proportional to the non-centrality parameter for the distribution. We demonstrate how these calculations can be carried out in Stata using the example of calculating power and sample size for case–control studies of gene–gene and gene–environment interactions. Do-files are available for these calculations.
Tipo: Journal Article
Palavras-chave: Gene–environment interaction; Gene–gene interaction; Power; Sample size; Study design; Non-central chi^2; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116031

Transparency in Supply Chains: Is Trust a Limiting Factor?
Provedor de dados: 31
Autores: Frentrup,   Mechthild; Theuvsen,   Ludwig.
Transparency has gained much relevance in food chains. This paper summarizes the determinants of transparency and points out that transparency in the sense of effective information exchange needs trust as a mediator in order to become a powerful tool in supply chain management. In addition to that this paper analyses the characteristics of trust and highlights the reciprocal and dynamic mechanisms of trust on transparency and vice versa. It is argued that both constructs should be enhanced at the same time in order to realize the benefits of trust and transparency on supply chain management.
Tipo: Conference Paper or Presentation
Palavras-chave: Transparency; Trust; Power; Control; Agribusiness; Agribusiness.
Ano: 2006
URL: http://purl.umn.edu/7733

GAINS IN PERFORMANCE OF DIESEL CYCLE ENGINE USING B10
Provedor de dados: 107
Autores: Guimarães, Camila Coelho; Santos, Vivianni Marques Leite dos; Dantas, Alan Christie da Silva; Cortez, Jorge Wilson; Pereira, Paulo José.
Studies to develop renewable fuels, such as biodiesel, as substitutes for petroleum diesel are of great environmental importance. However, to be effectively incorporated into the energy mix, satisfactory performance of a diesel cycle engine under the effect of this biofuel must be ensured. The objective of this study was to evaluate the specific fuel consumption, effective power and torque of a diesel engine with respect to resistive loads under varying volumetric proportions of soybean biodiesel in diesel mineral oil (5% (B5), 10% (B10), 25% (B25) and 50% (B50)) under varying applied loads (1.5, 3.0, 4.5, 6.0, 7.5 and 9.0 kW). For the test, a 7.36 kW engine coupled to a 28.8 kW three-phase electric generator was used. The loads were elevated up to 9.0 kW...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Energia na Agricultura consumption; Dynamometer test; Power; Torque.
Ano: 2018
URL: http://www.seer.ufv.br/seer/index.php/reveng/article/view/762

Design and fabrication of a tractor powered leaves collector machine equipped with suction-blower system
Provedor de dados: 111
Autores: Azadbakht, Mohsen; Kiapey, Ali; Jafari, Ali.
Leaves scattered on the parks, passages, and other places have a detrimental effect on the beauty of the environment, and decrease photosynthesis, hence, the efficiency of plants.  Leaves are also used in the production of peat.  This makes using leaves collectors in parks, and organizations with a green space useful.  Due to the fact that leaves take up a high volume, their transportation is difficult.  Using the machine introduced in this paper which was equipped with a suction-blower system, increases efficiency, and at the same time decreases the costs of green space, and their workforce cost.  Focusing on overcoming the mentioned difficulties, this study was carried out in order to design and produce a tractor powered leaves collector equipped with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaves collector; Blower system; Suction system; Design; Power; Tractor.
Ano: 2014
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2850

The effect of thickness and power on the Hayward variety in drying process of kiwifruit using microwave
Provedor de dados: 111
Autores: Azadbakht, Mohsen; Tajari, Neda.
In this study, the rate of microwave drying method kiwifruit (Hayward variety) was studied. Samples in a completely randomized design with three different thicknesses of 4, 6 and 8 mm and weight of 15 g and three power of 200, 300 and 400W, with three replications, were dried in the microwave dryer. The samples were weighed every 30 seconds, and then moisture ratio was obtained. According to the results of experiments with different thicknesses Kiwifruit by increasing power, drying time decreased. The amount of effective moisture diffusion coefficient of kiwifruit slices with thickness of 4, 6 and 8 (mm), 3.25×10-9 to 6.49×10-9 (m2/s) and 3.65×10-9 to 1.83×10-8 (m2/s) and 1.29×10-8 to 3.25×10-8 (m2/s) was changed. The value of the effective activation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dryer; Kiwifruit; Microwave; Power; Thickness.
Ano: 2015
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3172

Application of PFC3D to simulate a planetary ball mill
Provedor de dados: 111
Autores: Chen, Ying; Guzman, Leno; Potter, Simon; Khan, Majibur.
Planetary ball mill is a versatile machine which has been used for grinding different types of materials for size reduction and lately for hemp decortication. PFC3D, software employing the discrete element method (DEM), was used to simulate the power and energy requirement of grinding hemp for fibre using a planetary ball mill. The simulation was facilitated through a series of hemp grinding tests using the planetary ball mill to examine the power draw of the mill. The test results identified that grinding speed had a significant effect on the power draw of the mill. The power draw data were used to calibrate the discrete element parameters for different grinding speeds. Using the calibrated parameters, one was able to predict the kinetic energy and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural machinery; Bioprocessing PFC3D; Discrete element model (DEM); Hemp; Planetary ball mill; Power; Energy; Kinetic; Friction.
Ano: 2015
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2986

Application of Urine as Fuel in a Soil-based Membrane-less Single Chamber Microbial Fuel Cell
Provedor de dados: 111
Autores: Simeon, Meshack Imologie; Otache., Matins Yusuf; Ewemojie, Temitayo Abayomi; RAJI, AbdulGaniy Olayinka.
Microbial fuel cell (MFC) technology is a promising bio-technology that utilizes the microorganism in organic wastes to generate electricity. Although human urine has been identified as a suitable substrate in MFCs, its possible utilization in a soil-based Membrane-less Single Chamber Microbial Fuel Cell (MSCMFC) for constant power generation has, hitherto, not been reported. In this study, a MFC was set up with mud as inoculums in a plastic cylindrical vessel using carbon felt electrodes. It was operated for 19 days (456 hours) without extra substrate. Then, the MFC was treated with human urine (as substrate) four times (Days 19, 24, 32 and 36) each time the MFC output stabilized across external loads. A control MFC (MFCcontrol) was made the same way and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Renewable Energy; Microbial Fuel Cell Technology Soil; Urine; Microorganism; Power; Fuel Cell.
Ano: 2019
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4808

Evaluation of new agricultural tractors engines by using a portable dynamometer
Provedor de dados: 65
Autores: Farias,Marcelo Silveira de; Schlosser,José Fernando; Estrada,Javier Solis; Frantz,Ulisses Giacomini; Rodrigues,Fabrício Azevedo.
ABSTRACT: Official agricultural engineering testing aims to determine torque and power, which are important information for decision making when buying an agricultural tractor. In this research the torque and maximum power values provided by manufacturers with the dynamometer tests values, were compared. Forty new agricultural tractors commercialized in the brazilian market were used. Tractors were classified according to the power range in: Class I (less than or equal 22.1kW); Class II (between 22.1 and 51.5kW); Class III (51.5 and 73.5kW); Class IV (73.5 and 117.7kW); and Class V (117.7 and 183.9kW). Variables were analyzed with the statistic t-Student test (P≥0.05). Class IV tractors engines power is bigger in comparison to the values specified by...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Diesel cycle; Torque; Power.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000500820

Sisvar: a Guide for its Bootstrap procedures in multiple comparisons
Provedor de dados: 64
Autores: Ferreira,Daniel Furtado.
Sisvar is a statistical analysis system with a large usage by the scientific community to produce statistical analyses and to produce scientific results and conclusions. The large use of the statistical procedures of Sisvar by the scientific community is due to it being accurate, precise, simple and robust. With many options of analysis, Sisvar has a not so largely used analysis that is the multiple comparison procedures using bootstrap approaches. This paper aims to review this subject and to show some advantages of using Sisvar to perform such analysis to compare treatments means. Tests like Dunnett, Tukey, Student-Newman-Keuls and Scott-Knott are performed alternatively by bootstrap methods and show greater power and better controls of experimentwise...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Monte Carlo; Type I error; Power.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542014000200001