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Registros recuperados: 172
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NASYP: Online expert tool on the control of major-accident hazards involving dangerous substances AgEcon
Kahuda, Daniel; Vach, Marek; Cerba, Otakar; Krivanek, Zbynek; Jezek, Jan; Charvat, Karel; Vohnout, Premysl; Dvorak, V..
NASYP is an online Geoportal tool being developed in cooperation with state and regional authorities to improve insufficient practices based on implementation of Directive nr. 2003/105/ES on the control of major-accident hazards involving dangerous substances. The tool is applicable for managing the permits, reporting and regular monitoring issues. Furthermore, it’s applicable for a risk assessment and a rapid management of disasters in the initial phase. There’re simple modeling tools included to simulate early stages of the contamination caused by disasters occurred to be used for decision making and effective use of emergency services. In this manner, there’re low atmospheric and surface water pollutions taken into account. For the study area, Liberec...
Tipo: Journal Article Palavras-chave: Spatial data; Geoportal; Risk management; Modelling; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Risk and Uncertainty; GA; IN.
Ano: 2011 URL: http://purl.umn.edu/116384
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Numerical optimisation of trawls design to improve their energy efficiency ArchiMer
Priour, Daniel.
Trawls energy efficiency is greatly affected by the drag, as well as by the swept area regarding pelagic trawls and by the swept width for bottom ones. The drag results in an increase of the energy consumption and the sweeping influences the catch. In order to reduce the drag per swept area (or width) a numerical tool dedicated to the automatic optimisation of the trawl design has been developed. Based on a finite element method model for flexible netting structures, the tool modifies step by step a reference design. For each step the best-modified design, in terms of drag per swept area (or width), is kept. Such a methodology was used in two cases: which show a 43% increase in energy efficiency regarding the pelagic trawl case and 27% for the bottom trawl...
Tipo: Text Palavras-chave: Swept width; Swept area; Drag; Fuel consumption; Optimisation; Modelling; Trawl; Fishing gears.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6583.pdf
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Optimisation des conditions hydrobiologiques pour la conservation de l'huître creuse Crassostrea gigas en système re-circulé ArchiMer
Buzin, Florence.
The maintenance of bivalve commercialisation du ring periods when sales are prohibited represents a major economic issue for shellfish-farming. To ensure their survival and to preserve the oyster Crassostrea gigas quality, their storage in land-based systems has been studied i) out of water in a cold room at 3°C with controlled humidity, enabling the bivalve sensory quality to be retained for 15 days, and ii) in recirculating systems in immersed conditions for 30 days. For the latter, the oysters were stored at 167 kg.m3 density in a tank equipped with an air-lift system, with water treated with UV and thermoregulated. A minimum of food was supplied to avoid mass tissue loss. A temperature of 16°C was defined as optimal to limit mortality and to avoid...
Tipo: Text Palavras-chave: Crassostrea gigas; Huître Pacifique; Système re-circulé; Ecophysiologie; Sauvegarde; Modélisation; Crassostrea gigas; Pacific oyster; Recirculating system; Ecophysiology; Safeguard; Modelling.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00092/20350/17995.pdf
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Optimisation methods for assisting policy decisions on endemic diseases AgEcon
Stott, Alistair W..
Endemic disease of animals is an economic problem as it deprives humans of scarce resources that might otherwise satisfy human wants. Optimisation methods identify the strategies that minimise this economic problem. Given the potentially vast extent of the deprivation, not only in terms of lost wealth but also in terms of animal welfare, human health and environmental damage, this subject offers great benefits to decision-makers from the individual farm to the global level. This paper uses examples to illustrate the basic economic principles concerned. It shows how these principles may be extended to deal with current limitations in theory and practice. Lack of data is a common problem that may be dealt with by using computer simulation, theoretical...
Tipo: Working or Discussion Paper Palavras-chave: Economics; Decision analysis; Optimisation; Modelling; Endemic disease; Knowledge transfer; Health Economics and Policy.
Ano: 2006 URL: http://purl.umn.edu/46000
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Opt-in of the agricultural sector to the European trading scheme for greenhouse gas emissions – a proposal and its possible effects AgEcon
Perez Dominguez, Ignacio; Holm-Muller, Karin.
In light of international discussions on a possible opt-in of the agricultural sector to the current European emission trading system for greenhouse gases, the objective of this article is to present a feasible implementation strategy for a market of emission permits in European agriculture and to simulate its economic effects within the regionalised agricultural sector model CAPRI. With this purpose, we compare the effects of a 15% reduction of greenhouse gas emissions from European agriculture with and without a trading scheme. Our findings suggest that if significant emission abatement is to be achieved in the agricultural sector, efficiency gains from expanding the current emission trading scheme to this sector can be appreciable. An additional finding...
Tipo: Journal Article Palavras-chave: Climate gas emissions; Emission trading; Abatement costs; Agricultural policy; Modelling; Agricultural and Food Policy.
Ano: 2007 URL: http://purl.umn.edu/96766
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Parametrização do modelo CANEGRO para as cultivares brasileiras de cana-de-açúcar. Repositório Alice
NASSIF, D. S. P.; MARIN, F. R..
O objetivo do presente trabalho foi a parametrização do modelo CANEGRO para a as cultivares brasileiras IAC 91-1099 e SP 89 1115.
Tipo: Folhetos Palavras-chave: Cultivares brasileiras de cana-de-açúcar; Modelo CANEGRO; Parametrização do modelo CANEGRO; DSSAT; Brazilian sugar cane; Modelling; Simulation.; Simulação..
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/660738
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Participatory Modelling and Decision Support for Natural Resources Management in Climate Change Research AgEcon
Giupponi, Carlo; Mysiak, Jaroslav; Sgobbi, Alessandra.
The ever greater role given to public participation by laws and regulations, in particular in the field of environmental management calls for new operational methods and tools for managers and practitioners. This paper analyses the potentials and the critical limitations of current approaches in the fields of simulation modelling (SM), public participation (PP) and decision analysis (DA), for natural resources management within the context of climate change research. The potential synergies of combining SM, PP and DA into an integrated methodological framework are identified and a methodological proposal is presented, called NetSyMoD (Network Analysis – Creative System Modelling – Decision Support), which aims at facilitating the involvement of...
Tipo: Conference Paper or Presentation Palavras-chave: Modelling; Public Participation; Natural Resource Management; Policy; Decision-Making; Governance; DSS; Resource /Energy Economics and Policy; Q5.
Ano: 2008 URL: http://purl.umn.edu/6375
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Pattern formation in models of plankton dynamics. A synthesis ArchiMer
Malchow, H; Petrovskii, S; Medvinsky, A.
The history of modelling plankton dynamics is already quite long and has been initiated by fishery science in the early 20th century. The main aim of modelling population dynamics is to improve the understanding of the functioning of food chains and webs and their dependence on internal and external conditions. Hence, mathematical models of biological population dynamics have not only to account for growth and interactions but also for spatial processes like random or directed and joint or relative motion of species as well as the variability of the environment. Early attempts began with physicochemical diffusion, exponential growth and Lotka-Volterra type interactions. These approaches have been continuously refined to more realistic descriptions of the...
Tipo: Text Palavras-chave: Modélisation; Schémas de formation; Agrégation du plancton; Auto-organisation; Modelling; Pattern formation; Plankton patchiness; Self-organization.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43344/42882.pdf
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Pêcherie démersale côtière au Sénégal. Essai de modélisation de la dynamique de l'exploitation des stocks OceanDocs
Institut de Recherche pour le Développement, Paris (France); Fall, Massal.
Français - Les traits essentiels de la côte sénégalaise, repères historiques de la pêche, communautés de pêcheurs, caractéristiques des flottes et modes d’accès à la ressource et d’interaction sont analysés. Les caractéristiques, tendances décroissantes de l’abondance,niveaux d’exploitation, mesures d’aménagement, relations interspécifiques, changements potentiels et sources de variation des stocks démersaux côtiers sont précisés. Les notions de tactiques et stratégies de pêche sont passées en revue, conceptualisées puis étudiées.Le modèle «Dynamique Conjointe Exploitation Ressource» utilisé repose sur la définition de 4 typologies. L’utilisation de méthodes de classification et de connaissances d’experts conduit à considérer 32 stocks, 31 strates, 82...
Tipo: Theses and Dissertations Palavras-chave: Fisheries; Demersal fisheries; Modelling; Stocks; Ecosystems; Community fishing; Inland waters; Marine water; Hydrologic cycle; Fishermen; Fishing fleet; Shrimp fisheries; Capture fisheries; Fisheries management; Trawling; Artisanal fishing; Fishing licenses.
Ano: 2009 URL: http://hdl.handle.net/1834/5004
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Performance evaluation of hybrid thin layer solar tunnel-windmill dryer in the drying of brined and non-brined Tafi (Siganussutor) Fish CIGR Journal
Odote, Peter; Kituu, Gareth M.; Obiero, Maurice; Ruwa, R; Honell, N H.
Studies were carried out to evaluate the performance of hybrid solar tunnel-windmill dryer in thin layer drying of brined and non-brined Tafi (Siganus spp.) fish. The fish were, eviscerated, and split into pieces of approximately 6cm by 4cm by 5mm was soaked in brine at 0 and 5% concentrations. The samples were dried in the dryer for 44 hours. The moisture content of the drying fish was evaluated by the AOAC oven drying procedure. In addition, analysis was carried out to establish the best thin layer drying model that describes the drying of fish in the hybrid wind-solar tunnel dryer. The moisture content of the drying fish was found to reduce linearly from 4.2 and 3.9kg/kg (db), respectively for brined and non-brined fish to 0.8kg/kg (db).  A two way...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural Engineering; Food Science and Technology Fish; Hybrid wind-solar tunnel dryer; Diffusivity; Modelling; Moisture content; Drying rate constant.
Ano: 2015 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3093
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Physiologie de la maturation et de la ponte chez l'huître creuse Crassostrea gigas ArchiMer
Soletchnik, Patrick; Geairon, Philippe; Razet, Daniel; Goulletquer, Philippe.
The physiological ecology of the Pacific oyster Crassostrea gigas was studied using a conditioning delayed by temperature. Experiments were carried out on five batches and 2 year-classes classified into 6 maturation stages. The scope for growth concerning the stages N*5 and 6 was nearly zero while positive for early stages as well as for the post-spawning stage. Moreover, the 1 year-old oysters showed a significant lowered scope for growth (-110 J/h) compared to adult oysters (-14 J/h), therefore demonstrating the increased sensitivity of young oysters to stressful environmental conditions. By comparing the experimental results with the current models, developed on immature oysters, facilitates the model parameters spécifications during gametogenesis. For...
Tipo: Text Palavras-chave: Modelling; Ecophysiology; Mortality; Crassostrea gigas; Modèle; Ecophysiologie; Mortalité; Crassostrea gigas.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/1996/rapport-1643.pdf
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Phytoplankton competition and coexistence: Intrinsic ecosystem dynamics and impact of vertical mixing ArchiMer
Perruche, Coralie; Riviere, Pascal; Pondaven, Philippe; Carton, Xavier.
This paper aims at studying analytically the functioning of a very simple ecosystem model with two phytoplankton species. First, using the dynamical system theory, we determine its nonlinear equilibria, their stability and characteristic timescales with a focus on phytoplankton competition. Particular attention is paid to the model sensitivity to parameter change. Then, the influence of vertical mixing and sinking of detritus on the vertically-distributed ecosystem model is investigated. The analytical results reveal a high diversity of ecosystem structures with fixed points and limit cycles that are mainly sensitive to variations of light intensity and total amount of nitrogen matter. The sensitivity to other parameters such as remineralisation, growth...
Tipo: Text Palavras-chave: Water mixing; Dynamical system; Phytoplankton; Competition; Ecosystem; Modelling.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/2009/publication-7334.pdf
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Plagiarism Without Apology--Systematic Integration of Available Information in a Long Run Agricultural Outlook AgEcon
Witzke, Heinz Peter; Britz, Wolfgang.
In the context of a long run agricultural outlook on behalf of the European Environmental Agency a new methodology has been developed to systematically integrate external forecasts into a quite detailed agricultural sector model. External forecasts usually provide estimates for the exogenous variables in modelling work and frequently they are also used for comparisons and potential reassessment of empirical specifications. The innovative characteristic of this study is that expert forecasts have been used to specify parameter changes expressing structural change affecting behavioural functions. The outlook was therefore set up as a simultaneous estimation and forecasting effort which permitted to integrate various, usually contradictory expert forecasts...
Tipo: Conference Paper or Presentation Palavras-chave: Agricultural outlook; Forecasting; Modelling; Expert information; Agricultural and Food Policy; C15; C53; Q11; Q19; Q21.
Ano: 2005 URL: http://purl.umn.edu/24666
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POSSIBILITIES FOR ECOHYDROLOGICAL MONITORING IN NATURAL AND MANAGED ECOSYSTEMS IN SOUTHERN CHILE Gayana Botánica
Peters,Jan; Wieme,Vanessa; Boeckx,Pascal; Samson,Roeland; Godoy,Roberto; Oyarzún,Carlos; Verhoest,Niko.
Ecohydrology investigates how hydrological processes affect plant growth and vice versa. As these mutual interactions are important in many ecosystems, ecohydrology has wide applicability. An important aspect of ecohydrological research is the assessment and prediction of the occurrence of plant species or vegetation types in relation to hydrological or hydrogeochemical habitat conditions. Several models have been developed (e.g. DEMNAT, ICHORS, ITORS, ITORS-VL). All of these models are data driven. Consequently a monitoring network has to be installed, possibly in addition to existing databases. These networks are ecosystem specific but the most widely monitored variables are: water table depth, electric conductivity of groundwater, soil moisture content...
Tipo: Journal article Palavras-chave: Ecohydrology; Modelling; Vegetation; Hydrology; Decision support systems.
Ano: 2005 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200007
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Potato potential yield based on climatic elements and cultivar characteristics Bragantia
Pereira,André Belmont; Villa Nova,Nilson Augusto; Ramos,Valdir Josué; Pereira,Antonio Roberto.
There is currently a great deal of interest in estimating crop productivity as a function of climatic elements by means of different crop weather models. An agrometeorological model is presented based on carbon dioxide assimilation maximum rates for C3 plants, fraction of photosynthetically active radiation, air temperature, photoperiod duration, and crop parameters under tropical climate conditions. Such crop parameters include leaf area and harvest indexes, dry matter content of potato tubers, and crop cycles to estimate potato potential yields. Field data from observed productivity obtained with the cultivar Itararé (IAC-5986), grown under adequate soil water supply conditions at four different regions in the State of São Paulo (Itararé, Piracicaba,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Modelling; Solanum tuberosum L.; Climatic elements; Crop indexes; Yield.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052008000200008
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Potential role of compressional structures in generating submarine slope failures in the Niger Delta ArchiMer
Sultan, Nabil; Voisset, Michel; Marsset, Bruno; Marsset, Tania; Cauquil, E; Colliat, J.
The study area, offshore Nigeria, is located in one of the compressional zones within the Niger Delta, which is characterized by imbricate thrust structures. Although the low mean slope angle (around 2°), bathymetry data from the study area have shown the existence of several submarine landslides which coincide with known subsurface faulted compressive features. In this paper, we have focused on a submarine slide occurring in water depths ranging between 1690 and 1750 m. Headwall scars, internal architecture and associated deposits have been characterized using a combination of 3D seismic data, near-bottom echosounder seismic profiles, Kullenberg cores and in-situ geotechnical measurements. The slide shows horseshoe shaped headwall scars and depositional...
Tipo: Text Palavras-chave: Slope stability; Piezometer; Penetrometer; Niger Delta; Modelling; Compressional structures.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2408.pdf
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Prediction of tractive force model for disc harrowing using sensitivity analysis CIGR Journal
Nkakini, Silas Ovua; Douglas, I. E..
In this study, a comparative evaluation of tractive force models for disc harrowing, at different tillage speeds was carried out in order to determine optimal tillage speeds.  The predictive models were developed using dimensional analysis.  The tillage operation in a loamy sand soil, at tillage speeds of 1.94 m s-1, 2.22 m s-1 and 2.5 m s-1 respectively was conducted, using trace tractor techniques.  Parameters such as drawbar pull, rolling resistance, wheel slip, moisture content, cone index, wheel numeric, contact pressure, speed, width of harrow, depth of harrow, and tractive force were measured.  The developed mathematical models describing the tractors tyre-soil interactions parameters were evaluated using sensitivity analysis of the measured...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Predictive; Tractive force; Disc harrowing; Tillage; Loamy; Sand; Soil; Modelling; Sensitivity measurement; Soil moisture..
Ano: 2013 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2374
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Predictive systems ecology ArchiMer
Evans, Matthew R.; Bithell, Mike; Cornell, Stephen J.; Dall, Sasha R. X.; Diaz, Sandra; Emmott, Stephen; Ernande, Bruno; Grimm, Volker; Hodgson, David J.; Lewis, Simon L.; Mace, Georgina M.; Morecroft, Michael; Moustakas, Aristides; Murphy, Eugene; Newbold, Tim; Norris, K. J.; Petchey, Owen; Smith, Matthew; Travis, Justin M. J.; Benton, Tim G..
Human societies, and their well-being, depend to a significant extent on the state of the ecosystems that surround them. These ecosystems are changing rapidly usually in response to anthropogenic changes in the environment. To determine the likely impact of environmental change on ecosystems and the best ways to manage them, it would be desirable to be able to predict their future states. We present a proposal to develop the paradigm of predictive systems ecology, explicitly to understand and predict the properties and behaviour of ecological systems. We discuss the necessary and desirable features of predictive systems ecology models. There are places where predictive systems ecology is already being practised and we summarize a range of terrestrial and...
Tipo: Text Palavras-chave: Modelling; Systems ecology; Climate change; Ecosystem assessment.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00177/28816/27291.pdf
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Preparação de dados para a modelagem de ocorrências da ferrugem asiática da soja. Repositório Alice
MEGETO, G. A. S.; MEIRA, C. A. A..
O objetivo do trabalho foi preparar dados para a modelagem de ocorrências de ferrugem asiática da soja. O intuito dessa modelagem é a descoberta de regras que permitam predizer o risco de aparecimento de focos da doença com base em condições meteorológicas e dados sobre a cultura.
Tipo: Folhetos Palavras-chave: Ferrugem asiática da soja; Modelagem; Mineração de dados; Data mining; Plant disease.; Modelling; Doença de Planta..
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/660788
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Processus Gravitaires et Évaluation de la Stabilité des Pentes : Approches Géologique et Géotechnique. Application à la marge algérienne et à l'effondrement de l'aéroport de Nice en 1979 ArchiMer
Dan, Gabriela.
The present work consists of two areas of interest: the Algerian margin and the area affected by the 1979 Nice slide. The first scientific survey, MARADJA, took place in 2003 in order to characterize the Algerian margin from a morpho-sedimentary point of view and to map the presence of mass-wasting deposits. Based on other two scientific surveys, PRISMA and MARADJA 2, the mechanical and physical properties of the Algerian sediment were defined. The geotechnical properties were used to identify the triggering mechanisms of the observed mass-wasting deposits and to assess the present-day slope stability. The main results are: • The sedimentary processes are clearly influenced by the morphology of the margin, which is controlled by the tectonics. The...
Tipo: Text Palavras-chave: Liquefaction; Slope stability; Nice 1979; Algeria; Modelling; Numerical; Modélisation; Liquéfaction; Stabilité de pente; Processus gravitaires; Nice 1979; Algérie.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/these-3881.pdf
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