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Registros recuperados: 153
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3D modelling of seasonal evolution of Loire and Gironde plumes on Biscay Bay continental shelf ArchiMer
Lazure, Pascal; Jegou, Anne-marie.
A 3D model of the Atlantic shelf has been developed and applied to study shelf dynamics and evolution of hydrology. The model takes the combined effects of tide, wind, river discharges and surface heat flux into account. Time scales vary from 1 day to several years. Following a brief description of the model and forcing variables, the behaviour of the Loire and Gironde plumes is described, first for winter and spring, then over a period of several years, under realistic forcing. The results show that plume evolution depends on the high Variability of river runoff and winds. Model simulations performed over 7 years (1990 to 1996) have highlighted several features of these plumes: 1) In early winter and periods of high river runoff, plumes usually spread...
Tipo: Text Palavras-chave: Panache; Modélisation; Dynamique du plateau continental; Golfe de Gascogne; River plume; Modelling; Shelf dynamics; Bay of Biscay.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/publication-847.pdf
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A digital atlas to link ontogenic shifts in fish spatial distribution to the environment of the eastern English Channel. Dab, Limanda limanda as a case-study ArchiMer
Martin, Corinne; Vaz, Sandrine; Koubbi, Philippe; Meaden, Geoff; Engelhard, Georg H.; Lauria, Valentina; Gardel, Laure; Coppin, Franck; Delavenne, Juliette; Dupuis, Ludovic; Ernande, Bruno; Foveau, Aurelie; Lelievre, Stephanie; Morin, Jocelyne; Warembourg, Caroline; Carpentier, Andre.
The eastern English Channel, which connects the Atlantic Ocean to the North Sea through the Dover Strait, is an area where numerous and often conflicting human activities take place. A cross-border multidisciplinary project called CHARM was initiated to provide knowledge and tools for planners and decision-makers to durably manage the shared marine living resources. One such tool was an atlas of fish spatial distributions and modelled habitats, which was used here to investigate ontogenic and seasonal shifts in fish spatial distribution and habitat through a case-study, the dab Limanda limanda. Survey data for several life-history stages (eggs, larvae, coastal nurseries, < and > 1 year old) and seasons were used to map spatial patterns (using...
Tipo: Text Palavras-chave: Pleuronectidae; Limanda limanda; Eastern Channel; Spatial distribution; Modelling; Kriging; Ichthyoplankton; Trawl; CUFES.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00008/11942/8646.pdf
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A fenntartható fejlődést szolgáló paradigma AgEcon
Meszaros, Sandor.
Az uralkodó neoklasszikus paradigma alapján a 20. század második felében a gazdasági növekedés a várható klímaváltozás, a Föld természeti erőforrásai és a társadalmi egyenlőtlenségek figyelembevétele nélkül ment végbe. Erre a helyzetre szolgált válaszul a fenntarthatóság koncepciója, amely az utóbbi két évtizedben globális mozgalommá vált, és nemzeti alkalmazkodási stratégiák kidolgozásához vezetett. A gazdaság működésére azonban igazán új paradigma mégsem született, bár a köz¬gazdaságtan a komplexitás irányába látszik fejlődni. Az új (transzdiszciplináris) paradigma eddigi hiánya ellenére a szükséges változások irányai már felismerhetők: a fosszilis energiaforrások mielőbbi helyettesítése és az erdőgazdaság kiemelt kezelése (Low Carbon Economy), valamint...
Tipo: Journal Article Palavras-chave: Gazdasági paradigmák; Fenntarthatóság; Klímaváltozás; Globalizáció; Modellezés; Economic paradigms; Sustainability; Climate change; Globalisation; Modelling; Agricultural and Food Policy; Environmental Economics and Policy.
Ano: 2010 URL: http://purl.umn.edu/99116
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A modelling study of the thermohaline circulation of the Mediterranean Sea: Water formation and dispersal ArchiMer
Haines, K; Wu, Pl.
A model of the whole Mediterranean sea at 0.25 degrees x 0.25 degrees resolution has been run for ten years with a mean seasonal cycle of forcing using NMC winds and a relaxation to NODC surface temperature and salinity. The winter season water formation and dispersal in the model thermocline has been studied using isopycnal diagnostics and potential vorticity as a water mass tracer. In the eastern basin Levantine Intermediate Water (LIW) is formed in the cyclonic Rhodes gyre and moves west in a continuous mass, accumulating and mixing in the centre of the Northern Ionian. The LIW spreading path is identified both from the high salinity and low potential vorticity values on the 28.8 isopycnal surface. Some LIW then spreads west and south towards Sicily,...
Tipo: Text Palavras-chave: PRIMO-O; Circulation thermohaline; Eau levantine intermédiaire; Formation; Modélisation; PRIMO-O; Thermohaline circulation; Levantine Intermediate Water; Water formation; Modelling.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/00323/43387/43113.pdf
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A moderate melting model for the Voring margin (Norway) based on structural observations and a thermo-kinematical modelling: Implication for the meaning of the lower crustal bodies ArchiMer
Gernigon, Laurent; Lucazeau, Francis; Brigaud, Frederic; Ringenbach, Jean-claude; Planke, Sverre; Le Gall, Bernard.
High P-wave velocities (7.1-7.8 km/s) lower crustal bodies (LCBs) imaged along volcanic margins are commonly interpreted as plume and break-up-related thick mafic underplating. This interpretation is partly challenged in this paper based on new seismic observations and modelling of the outer Voring Basin (Norway). An exceptional strong amplitude reflection, the T Reflection, is particularly well defined below the North Gjallar Ridge (NGR) between 7 and 8 s TWT. The T Reflection is located near the volcanic lava flows emplaced during the NE Atlantic breakup (similar to 55-54 Ma ago) and coincides with the top of the LCB, forming a mid-crustal dome. Based on structural and temporal relationships, we show that the dome clearly influences the structural...
Tipo: Text Palavras-chave: Mantle plume; Norwegian margin; Underplating; Breakup; Modelling; Rifting; Volcanic margins.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1042.pdf
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A review of Multi-Agent Simulation Models in Agriculture AgEcon
Kaye-Blake, William; Li, Frank Y.; Martin, A. McLeish; McDermott, Alan; Neil, Hayley; Rains, Scott.
Multi-Agent Simulation (MAS) models are intended to capture emergent properties of complex systems that are not amenable to equilibrium analysis. They are beginning to see some use for analysing agricultural systems. The paper reports on work in progress to create a MAS for specific sectors in New Zealand agriculture. One part of the paper focuses on options for modelling land and other resources such as water, labour and capital in this model, as well as markets for exchanging resources and commodities. A second part considers options for modelling agent heterogeneity, especially risk preferences of farmers, and the impacts on decision-making. The final section outlines the MAS that the authors will be constructing over the next few years and the types of...
Tipo: Conference Paper or Presentation Palavras-chave: Multi-agent simulation models; Modelling; Agent-based model; Cellular automata; Decision-making; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Livestock Production/Industries.
Ano: 2009 URL: http://purl.umn.edu/97165
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A simplified model for A. Niger FS3 growth during phytase formation in solid State fermentation BABT
Spier,Michele Rigon; Letti,Luiz Alberto Junior; Woiciechowski,Adenise Lorenci; Soccol,Carlos Ricardo.
A simplified model to describe fungal growth during citric pulp fermentation for phytase production was described for the first time. Experimental data for biomass growth were adjusted to classical mathematical growth models (Monod and Logistic). The Monod model predictions showed good agreement with the experimental results for biomass concentration during 96 hours of fermentation. Parameters such as yield of biomass from oxygen (Y X/O), maintenance coefficient (m) and specific growth rate (µ) were compared showing a good correlation between the data and the model. An alternative method for biomass determination in this process was developed since a great correlation was found between biomass growth and enzyme formation.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Monod Model; Logistic model; Modelling; Fungal growth; Phytase formation; Citric pulp.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000700020
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A single bio-energetics growth and reproduction model for the oyster Crassostrea gigas in six Atlantic ecosystems ArchiMer
Alunno-bruscia, Marianne; Bourles, Yves; Maurer, Daniele; Robert, Stephane; Mazurie, Joseph; Gangnery, Aline; Goulletquer, Philippe; Pouvreau, Stephane.
Many studies based on bioenergetics growth models have investigated the effects of environmental factors on oyster (Crassostrea gigas) growth and physiology. However, most of these models are site-specific and cannot be applied to other culture sites without the re-estimation of parameters or re-formulation of some processes. We aimed to develop a generic growth model suitable for application in contrasting environments, with a constant set of parameters. We tested the oyster-DEB model (Bourlès et al. 2009) for the stimulation of C. gigas growth in different cohorts (spats and adults) at major shellfish culture sites in France, in several years: Arcachon (1993–1994); Marennes-Oléron (2007); Quiberon (1999, 2000, 2001); Rade de Brest (2008); Baie du...
Tipo: Text Palavras-chave: DEB theory; Modelling; Bivalves; Crassostrea gigas; Phytoplankton; Temperature effect; Coastal environment..
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00043/15403/12762.pdf
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Active faulting and deep crustal structure of the Eastern Sicily Margin ArchiMer
Dellong, David.
In the Ionian Sea (central Mediterranean) the slow convergence between Africa and Eurasia results in the formation of a narrow subduction zone. The nature of the crust of the subducting plate remains debated and could represent the last remnants of the Neo-Tethys ocean. The origin of the Ionian basin is also under discussion, especially concerning the rifting mechanisms as the Malta Escarpment could represent a remnant of this opening. This subduction retreats toward the south-east (motion occurring since the last 35 Ma) but is confined to the narrow Ionian basin. A major lateral slab tear fault is required to accommodate the slab rollback.This fault is thought to propagate along the eastern Sicily margin but its precise location remains controversial.This...
Tipo: Text Palavras-chave: Méditerranée; Ionien; Calabre; Géodynamique; Marge; Faille de déchirure lithosphérique; Sismicité; Sismique; Grand-angle; Bathymétrie; Gravimétrie; Modélisation; Mediterranean; Ionian; Calabria; Geodynamic; Subduction; Margin; STEP fault; Wide-angle seismic; Seismicity; Bathymetry; Gravity; Modelling.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00499/61026/64430.pdf
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Adaptative responses of E-coli to marine environmental stresses. a modelling approach based on viability and dormancy concepts ArchiMer
Martin, Y; Troussellier, Marc; Bonnefont, Jl.
In an attempt to synthesize conceptual and experimental information on the behaviour of enteric bacteria in seawater, a mathematical model has been developed. This model is based on changes in intracellular metabolisable components depending an physiological responses of the cell when subjected to nutrient starvation, salinity stress and solar radiation. Following a strategy which takes into account short- and mid-term physiological adaptation and reversal processes, the cells can develop in different states: culturable (B-1), viable and definitively nonculturable (B-2), and reversibly dormant (B-3) cells. Model parameters were deduced either from original microcosm experiments, from literature data or calibration procedures. Validation of the model was...
Tipo: Text Palavras-chave: Escherichia coli; Eau de mer; Stress; États cellulaires; Modélisation; Escherichia coli; Seawater; Stress; Cellular states; Modelling.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43646/43224.pdf
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Adjusting weight growth curve of male quails Coturnix japonica reared in the semi-arid region of the State of Pernambuco Animal Sciences
Lucena, Leandro Ricardo Rodrigues de; Holanda, Marco Aurélio Carneiro de; Holanda, Mônica Calixto Ribeiro de; Anjos, Marcelo Lopes dos.
This study adjusted different regression models to describe the growth pattern of meat quails from birth to 42 days of age. Data of 300 male quails were used. Weight and height information of all quails were collected weekly from the 1st to the 42nd day of age. Body weight of poultry was subjected to the polynomial, logistic, Gompertz, Weibull, and log-normal regression models. The criteria used to choose the best model to explain the growth curve of quails were the coefficient of determination of the model, Akaike’s information criterion, sum of squared residuals and Willmott’s index. For all the models used, the variables age and height were significant to explain the weight of quails. The polynomial (R² = 99.99%, AIC = 24.68, SSR = 27.5, d = 0.9999) and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Modelling; Poultry; Regression model..
Ano: 2018 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/42563
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Allometric equations for total, above- and below-ground biomass and carbon of the Amazonian forest type known as campinarana Acta Amazonica
WOORTMANN,Cecilia P.I.B.; HIGUCHI,Niro; SANTOS,Joaquim dos; SILVA,Roseana P. da.
ABSTRACT The Amazon forest comprises many different forest types, amongst them are campinas and campinaranas, which occur on Amazonian sandy soils, representing 2.65% of Amazonian territory. An understanding of the ecology and quantification of the environmental goods and services of campinaranas is key to their conservation. Based on a direct method to estimate biomass and carbon content of campinarana, we harvested and weighted 89 trees and other forest components in ten randomly allocated plots of 100 m2 (10 x 10 m) and 11 additional trees outside the plots. The data allowed us to describe how biomass is distributed amongst campinarana vegetation and amongst tree compartments. We developed allometric equations to estimate the total, above- and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Modelling; Forests on sand; Climate change.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672018000200085
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Analyse de la Reponse de l'offre des Pommes en Tunisie : Une Approche Econometrique AgEcon
Laajimi, Abderraouf; Guesmi, Anis; Dhehibi, Boubaker.
In Tunisia, the apples occupy a significant place on the sector of perennial crops. This crop covered expanded areas during the eighties following an extensive use of efficient water equipments. However, significant seasonal and annual variation of fruit supplies in the domestic market were frequently encountered affecting prices at both wholesale and consumption levels. To study the supply response of apples we carried out an econometric estimate of the model of supply response. Modelling was carried out in two stages: determination of the variation of the surfaces, on the basis of equation of news plantations and the equation of removals, and the variation of yields. The methodological approach that we followed takes account of the characteristics and...
Tipo: Conference Paper or Presentation Palavras-chave: Supply response; Modelling; Expected prices; Apples; Demand and Price Analysis.
Ano: 2007 URL: http://purl.umn.edu/9392
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Analysis of the Influence of Hydrostatic Stress on the Behaviour of an Adhesive in a Bonded Assembly ArchiMer
Cognard, J. Y.; Creac'Hcadec, R.; Maurice, J.; Davies, Peter; Peleau, Michel; Da Silva, L. F. M..
Generally, adhesives are viscoelastic-plastic materials, for which the development of viscosity and plasticity varies depending on the type of adhesive and the stress state. Various models exist to represent the yield surface, or the so-called elastic limit, taking into account the two stress invariants, hydrostatic stress and von Mises equivalent stress. Moreover, to develop precise pressure-dependent constitutive models, it is necessary to have a large experimental database in order to accurately represent the adhesive strains which are strongly dependent on the tensile-shear loading combination. Under quasi-static loadings, for a given strain rate range viscous effects can be neglected, but only a few experimental results are available to model the...
Tipo: Text Palavras-chave: Adhesive testing; Non-linear behaviour; Modelling; Hydrostatic stress; Finite element analysis.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00018/12903/10396.pdf
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Applying Dynamic Energy Budget (DEB) theory to simulate growth and bio-energetics of blue mussels under low seston conditions ArchiMer
Rosland, R; Strand, O; Alunno-bruscia, Marianne; Bacher, Cedric; Strohmeier, T.
A Dynamic Energy Budget (DEB) model for simulation of growth and bioenergetics of blue mussels (Mytilus edulis) has been tested in three low seston sites in southern Norway. The observations comprise four datasets from laboratory experiments (physiological and biometrical mussel data) and three datasets from in situ growth experiments (biometrical mussel data). Additional in situ data from commercial farms in southern Norway were used for estimation of biometricalrelationships in the mussels. Three DEB parameters (shape coefficient, half saturation coefficient, and somatic maintenance rate coefficient) were estimated from experimental data, and the estimated parameters were complemented with parameter values from literature to establish a basic parameter...
Tipo: Text Palavras-chave: Low seston; Modelling; DEB theory; Mytilus edulis; Mussel culture.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6266.pdf
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Applying precision feeding to improve the nitrogen efficiency of swine production: a review of possible practices and obstacles Ciência Rural
Monteiro,Alessandra Nardina Trícia Rigo; Bertol,Teresinha Marisa; Kessler,Alexandre de Mello.
ABSTRACT: Optimizing nutrient efficiency is essential in order to increase sustainability of pig production systems, especially where the growing demand for food must be met at an affordable cost, without compromising environmental resources. To make this happen, it is necessary to develop efficient methods to accurately estimate the nutritional requirements of animals, as well as develop equipment and systems that allow for applying such expertise in the production system. Estimating the nutritional requirement of pigs through mathematical models, considering several factors that can impact the requirement, is a key factor to reduce the environmental load from pig production. Likewise, feed formulation and feeding programs, can help to achieve this. In...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diet formulation; Environmental impact; Modelling; Nutritional requirement; Pig.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000700653
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Approche de la circulation residuelle en Baie de Seine ArchiMer
Lehir, P; Salomon, J; Leprovost, C; Chabertd'Hieres, G; Mauvais, J.
By taking into account salinity measurements and consequently mean residence time, current measurements, tidal computation with a 2-D model and wind induced currents provided by a 3-D model, a global diagram of residual flow in Seine Bay is given. Main patterns are exhibited: density currents in the eastern part of the bay, off the Seine Estuary, wind induced circulation, especially along the coast and over the Channels, and tidal residual patterns induced by topography.
Tipo: Text Palavras-chave: Simulation; Modelling; Wind driven circulation; Bottom topography; Density gradients; Water masses; River discharge; Haline circulation; Salinity gradients; Tidal currents; Residual flow.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1263.pdf
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Assessment of an environmental barrier to transport of ichthyoplankton from the southern to OceanDocs
Lett, Christophe; Veitch, Jennifer; Van der Lingen, Carl D.; Hutchings, Larry.
The Lüderitz upwelling cell and Orange River cone (LUCORC) area, a transboundary region between South Africa and Namibia, is considered to be an environmental barrier to transport of ichthyoplankton from the southern to the northern Benguela upwelling ecosystems. We use environmental data and modelling to assess the potential mechanisms responsible for this barrier: environmental data were extracted from the 1 × 1° World Ocean Atlas 2001 database and used to build maps of annual mean salinity, temperature, chlorophyll, dissolved oxygen and nutrient concentrations; outputs of a regional circulation model were used in an individual-based model to assess the transport of passive particles from the southern to the northern Benguela. The data show no clear...
Tipo: Journal Contribution Palavras-chave: Ichthyoplankton; Upwelling; Modelling; Coastal oceanography; Trade winds; Salinity; Hydrodynamics; Cartesian coordinates; Chlorophylls.
Ano: 2007 URL: http://hdl.handle.net/1834/4667
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Assessment of the quantities of herbicides and nutrients brought down by the river Charente to the coast and modelling of the dispersion of atrazine in the Marennes-Oleron bay ArchiMer
Munaron, Dominique; Dubernet, Jf; Delmas, F; Stanisiere, Jean-yves; Scribe, P.
Our study aims at making progress the estimate of herbicide and nutrient inputs to the Marennes-Oleron bay which could influence summer oysters mortalities, and to bring, a better understanding of the impact on coastal ecosystems by modelling the dynamics of these compounds in the shellfish-farming area. The development of a strategy adapted to the river Charente and its estuary reveals that agricultural activity on the watershed area is omnipresent, as well on the level of the nitrogen as on the one of herbicides contributions. It is thus necessary to specify Charente fluxes, which is the main tributary of the Marennes-Oleron bay, in order to better characterize its impact on shell fish-farming activity. Hydrodynamic modelling will constitute an...
Tipo: Text Palavras-chave: Marennes Oleron bay; River Charente; Modelling; Fluxes; Nutrients; Herbicides.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-3612.pdf
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Biological and economic factors in the selection of cultured fish species and the development of a bio-economic model ArchiMer
Wu, R.
The selection of candidate species for mariculture is determined by a number of biological factors, e.g. foraging efficiency, growth efficiency, mortality, grow-out period and susceptibility to environmental fluctuations, disease and crowding, as well as economic factors e.g. the supply and price of fry, grow-out cost and price of adult. A computer model incorporating these major factors is being developed, to determine and compare the potential of different culture species.
Tipo: Text Palavras-chave: Lates calcarifer; Epinephelus tauvina; Mylio macrocephalus; Pisces; Marine fish; Tolerance; Biology; Modelling; Economic models; Diseases; Mortality; Growth; Cultured organisms.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/acte-1488.pdf
Registros recuperados: 153
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