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| Registros recuperados: 210 | |
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| Raveau, Adriana; Macher, Claire; Mehault, Sonia; Merzereaud, Mathieu; Le Grand, Christelle; Guyader, Olivier; Bertignac, Michel; Fifas, Spyros; Guillen Garcia, Jordi. |
| Several fleets with various fishing strategies operate as a mixed fishery in the Bay of Biscay. Among the main fleets, bottom trawlers target Norway lobster (Nephrops norvegicus) and, together with gillnetters, they also catch hake (Merluccius merluccius). Trawling leads to average-size catches that are below the minimum landing size (MLS); such catches are discarded since they cannot be sold. These discards result in negative impacts on stock renewal, as most of them do not survive. This also results in an economic loss for both bottom trawlers and gillnetters since these discards represent a future loss of rent. This study, based on the 2009 and 2010 selectivity experiments at sea, assesses the short- and long-term bio-economic impacts of four... |
| Tipo: Text |
Palavras-chave: Demersal trawl fishery; Bio-economic analysis; Selectivity; Simulation; Selective device; Nephrops norvegicus; Merluccius merluccius; Atlantic Ocean. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00110/22135/19774.pdf |
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| Meneghetti,Carlos Renato; Tizzei,Alexandre; Cappelli,Nelson Luis; Umezu,Claudio Kiyoshi; Bezzon,Guilherme. |
| Studies of control strategies for refrigeration systems observe, among other variables, the dynamic behavior of temperature and the consumption of electrical energy. Aiming to contribute to these studies, this work presents the proposal and validation of a mathematical model for the cooling system of a cold-storage unit. The model approximates the dynamics and interdependence of the variables, to first-order systems with time delay and the summation of effects. The input variables available are the frequency of compressor activation and the thermal load imposed on the unit, and as output variables, the air temperature both at the evaporator inlet and at the centre of the chamber, as well as the electrical power consumed by the compressor. The results... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Variable rotation; Simulation; Agricultural products-storage; Electrical energy-consumption. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000200010 |
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| Kramer, Daniel B; Michigan State University; dbk@msu.edu. |
| The utility of traditional bio-economic harvest models suffers from their dependence on two commonly used approaches. First, optimization is often assumed for harvester behavior despite system complexity and the often neglected costs associated with information gathering and deliberation. Second, ecosystem interactions are infrequently modeled despite a growing awareness that these interactions are important. This paper develops a simulation model to examine the consequences of harvesting at two trophic levels in a coral-reef food web. The model assumes adaptive rather than optimizing behavior among fishermen. The consequences of changing economic, biological, and social parameters are examined using resilience as an evaluative framework. Three general... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Fisheries; Resource economics; Coral reefs; Resilience; Adaptive behavior; Food web; Simulation. |
| Ano: 2008 |
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| Kell, L; Pilling, G; Kirkwood, G; Pastoors, M; Mesnil, Benoit; Korsbrekke, K; Abaunza, P; Aps, R; Biseau, Alain; Kunzlik, P; Needle, C; Roel, B; Ulrich, Clara. |
| Current scientific management objectives for ICES roundfish stocks are to ensure conservation of the biological resource and do not explicitly consider economic or social objectives. For example, there are currently no objectives to maximize the sustainable yield or to reduce variability in total allowable catches (TACs). This is despite the fact that the current system can result in wide annual fluctuations in TAC, limiting the ability of the fishing industry to plan for the future. Therefore, this study evaluated management strategies that stabilized catches by setting bounds on the interannual variability in TACs. An integrated modelling framework was used, which simulated both the real and observed systems and the interactions between system... |
| Tipo: Text |
Palavras-chave: Whiting; TAC; Simulation; Saithe; Population modelling; North Sea; Management; Limiting variations; Harvest strategies; Hake; Haddock; Evaluation; Cod; Bounds. |
| Ano: 2006 |
URL: https://archimer.ifremer.fr/doc/2006/publication-3694.pdf |
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| Elmer, Nicole A.; Thurow, Amy Purvis; Johnson, Jason L.; Rosson, C. Parr, III. |
| The Dixit-Pindyck model was applied to examine the hypothesis that uncertainty associated with grapefruit production costs and returns is an important determinant of Texas grapefruit growers' investment behavior. Freezes, price variability, and the effects of expanded trade were analyzed as risk factors. An investment decision rule based on a net-present value calculation would approve a 25-year commitment to a 20-acre grapefruit grove, given a 6-percent discount rate. The modified hurdle rate, calculated using an ex ante version of the Dixit-Pindyck model, is 24 percent. The major source of the risk borne by Texas grapefruit investors is from freezes, rather than from expanded trade. |
| Tipo: Journal Article |
Palavras-chave: Citrus; Ex ante analysis; Dixit-Pindyck model; Freezes; Investment; Simulation; Texas; Trade; Crop Production/Industries. |
| Ano: 2001 |
URL: http://purl.umn.edu/15451 |
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| Registros recuperados: 210 | |
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