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| Registros recuperados: 221 | |
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| Morel,Pierre; Arruda,Tatiana Langbeck de; Bohrer-Morel,Maria Beatriz C.. |
| Due to the need of showing the reliability of results from biological essays, such as in health and environmental areas, laboratories have been implementing quality systems, particularly ABNT NBR ISO/IEC 17025 (ABNT, 2001), which include as one of the requirements, the calculation of uncertainty in essays results. It is of common knowledge that estimating uncertainty in essays using organisms, such as animal and vegetal species, is difficult, preventing from meeting that requirement in the standard. The paper shows the calculation of uncertainties in influences quantities in these essays as a tool to allow validating the measuring process, by using the essays performed by Rhodia Environmental Impact Analysis Laboratory and IPEN Ecotoxicology Laboratory as... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Uncertainty; Influence quantities; Biological essays. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000200015 |
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| França,Elvis Joacir de; Fernandes,Elisabete A. De Nadai; Bacchi,Márcio Arruda; Saiki,Mitiko. |
| Instrumental neutron activation analysis (INAA) is a measurement technique of high metrological level for the determination of chemical elements. In the context of BIOTA/FAPESP Program, leaves of trees have been evaluated by INAA for biomonitoring purposes of the Atlantic Forest. To assure the comparability of results in environmental studies, a leaf sample of Marlierea tomentosa (Myrtaceae family) showing the lowest concentrations of chemical elements was selected for the evaluation of analytical quality of the determination under unfavorable conditions. Nevertheless, the homogeneity of chemical concentrations of sample at the 95% of confidence level has been achieved and INAA has presented repeatability of 2% for the determination of Br, Co, Cs, Fe, K,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Uncertainty; INAA; Jackknife; Bootstrap. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000200016 |
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| Cobián Romero, Lizbeth. |
| Una empresa innovadora que inicia en el mercado es conocida en la literatura como Start-Up; esté tipo de firmas al ser evaluadas con los métodos tradicionales (tasa interna de retorno, TIR; valor actual neto, VAN y relación benéfico-costo, B/C) son generalmente rechazadas debido a que no cuentan con información económico-financiera suficiente. El objetivo de éste trabajo fue determinar si la incorporación de las metodologías Opciones Reales y Valores Críticos a la evaluación tradicional agregan valor a empresas Start-Up. El caso que se trató fue el de una planta de bioplásticos. Para calcular la opción de compra al aumentar la producción se utilizó el método de Black-Scholes, que consiste en una ecuación y cinco variables. Para calcular el beneficio... |
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Palavras-chave: Black-Scholes; Evaluación de proyectos; Bioplástico; Riesgo; Incertidumbre; Project evaluation; Bioplastic; Risk; Uncertainty; Maestría; Economía. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/688 |
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| Armitage, Derek; University of Waterloo; derek.armitage@uwaterloo.ca; Charles, Anthony T; Saint Mary's University; Tony.Charles@SMU.CA; Johnson, Derek; University of Manitoba; derek_johnson@umanitoba.ca; Allison, Edward H; The WorldFish Center and the University of East Anglia; e.allison@cgiar.org. |
| Innovative combinations of social and ecological theory are required to deal with complexity and change in human-ecological systems. We examined the interplay and complementarities that emerge by linking resilience and social well-being approaches. First, we reflected on the limitations of applying ecological resilience concepts to social systems from the perspective of social theory, and particularly, the concept of well-being. Second, we examined the interplay of resilience and well-being concepts in fostering a social-ecological perspective that promises more appropriate management and policy actions. We examined five key points of interplay: (1) the limits of optimization thinking (e.g., maximum sustainable yield), (2) the role of human agency and... |
| Tipo: Peer-Reviewed Synthesis |
Palavras-chave: Adaptation; Agency; Governance; Integration; Interdisciplinarity; Policy; Sustainability; Thresholds; Transdisciplinarity; Uncertainty. |
| Ano: 2012 |
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| Devisscher, Tahia; Environmental Change Institute‬, School of Geography and the Environment, University of Oxford; Stockholm Environment Institute; tahia.devisscher@ouce.ox.ac.uk; Boyd, Emily; Department of Geography and Environmental Sciences, University of Reading; Lund University Centre for Sustainability Studies; emily.boyd@reading.ac.uk; Malhi, Yadvinder; Environmental Change Institute‬, School of Geography and the Environment, University of Oxford; yadvinder.malhi@ouce.ox.ac.uk. |
| Understanding complex social-ecological systems, and anticipating how they may respond to rapid change, requires an approach that incorporates environmental, social, economic, and policy factors, usually in a context of fragmented data availability. We employed fuzzy cognitive mapping (FCM) to integrate these factors in the assessment of future wildfire risk in the Chiquitania region, Bolivia. In this region, dealing with wildfires is becoming increasingly challenging because of reinforcing feedbacks between multiple drivers. We conducted semistructured interviews and constructed different FCMs in focus groups to understand the regional dynamics of wildfire from diverse perspectives. We used FCM modelling to evaluate possible adaptation scenarios in the... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Adaptation; Climate change; Complexity; Scenario; Social-ecological system; Uncertainty; Wildfire risk. |
| Ano: 2016 |
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| Peterson, Garry; McGill University; garry.peterson@mcgill.ca; De Leo, Giulio A; Agenzia Regionale per la Protezione dell' Ambiente; deleo@dsa.unipr.it; Hellmann, Jessica J; Stanford University; jessicah@leland.stanford.edu; Janssen, Marco A; Indiana University; maajanss@indiana.edu; Kinzig, Ann; Arizona State University; Ann.Kinzig@asu.edu; Malcolm, Jay R; University of Toronto; jay.malcolm@utoronto.ca; O'Brien, Karen L; -; kobrien@online.no; Pope, Shealagh E; Environment Canada; shealagh.pope@ec.gc.ca; Rothman, Dale S; Columbia University; drothman@bio2.edu; Shevliakova, Elena; Carnegie Mellon University; lenish@cmu.edu; Tinch, Robert R.T.; York University, UK; rrtt100@york.ac.uk. |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Adaptive management; Climate change; Global change; Uncertainty; Models. |
| Ano: 1997 |
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| Conroy, Michael J; USGS Cooperative Fish and Wildlife Research Unit; conroy@forestry.uga.edu; Allen, Craig; University of Nebraska; allencr@unl.edu; Peterson, James T; USGS Cooperative Fish and Wildlife Research Unit;; Pritchard, Lowell, Jr.; Emory University; lpritc2@emory.edu; Moore, Clinton T; ;. |
| The southern Piedmont of the southeastern United States epitomizes the complex and seemingly intractable problems and hard decisions that result from uncontrolled urban and suburban sprawl. Here we consider three recurrent themes in complicated problems involving complex systems: (1) scale dependencies and cross-scale, often nonlinear relationships; (2) resilience, in particular the potential for complex systems to move to alternate stable states with decreased ecological and/or economic value; and (3) uncertainty in the ability to understand and predict outcomes, perhaps particularly those that occur as a result of human impacts. We consider these issues in the context of landscape-level decision making, using as an example water resources and lotic... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Piedmont; Adaptive management; Land use; Model; Resilience; Scale; Sprawl; Uncertainty; Urbanization; Water resources. |
| Ano: 2003 |
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| Biber, Eric; University of California, Berkeley; ebiber@law.berkeley.edu. |
| The monitoring of ambient environmental conditions is essential to environmental management and regulation. However, effective monitoring is subject to a range of institutional, political, and legal constraints, constraints that are a product of the need for monitoring to be continuous, long lived, and well matched to the resources being studied. Political pressure or myopia, conflicting agency goals, the need for institutional autonomy, or a reluctance of agency scientists to pursue monitoring all may make it difficult for ambient monitoring to be effectively undertaken. Even if effective monitoring data is gathered, it may not be used in decision making. The inevitable residual uncertainty in monitoring data allows stakeholders to contest the use of... |
| Tipo: Peer-Reviewed Synthesis |
Palavras-chave: Environmental law; Monitoring; Uncertainty. |
| Ano: 2013 |
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| Cundill, Georgina N. R.; Rhodes University; gcundill@rides.cl; Fabricius, Christo; Rhodes University; c.fabricius@ru.ac.za; Marti, Neus; Autonomous University; neus@amauta.rcp.net.pe. |
| Complex systems are shaped by cross-scale interactions, nonlinear feedbacks, and uncertainty, among other factors. Transdisciplinary approaches that combine participatory and conventional methods and democratize knowledge to enable diverse inputs, including those from local, informal experts, are essential tools in understanding such systems. The metaphor of a “bridge” to overcome the divide between different disciplines and knowledge systems is often used to advocate for more inclusive approaches. However, there is a shortage of information and consensus on the process, methodologies, and techniques that are appropriate to achieve this. This paper compares two case studies from Peru and South Africa in which community-level assessments... |
| Tipo: Peer-Reviewed Synthesis |
Palavras-chave: Ecological assessment; Community-based assessment; Complexity; Scale; Epistemology; Methodology; Millennium Ecosystem Assessment; Complex systems; Uncertainty; Peru; South Africa; Case studies; Transdisciplinary research. |
| Ano: 2005 |
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| Registros recuperados: 221 | |
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