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Modélisation morphodynamique d'une embouchure tidale : Application aux Passes d'entrée du Bassin d'Arcachon ArchiMer
Cayocca, Florence.
The Arcachon tidal inlet exhibits a particularly active morphology due to strong tidal currents and rough wave conditions. During the past 300 years, maximum and minimum extents of the Cap Ferret sand spit have resulted in a difference of 8 km while two channels have alternatively allowed circulation between the lagoon and the ocean. A bidimensional horizontal morphodynarnic model was developed in order to simulate the system evolution under tidal forcing alone or under combined tide and wave action. Modelling at a scale of decades requires the definition of mean annual wave and tide conditions which are representative with respect to sediment transport. Medium term results thus give general trends of evolution. Driven by these average conditions and...
Tipo: Text Palavras-chave: Littoral drift; Sediment transport; Tide; Waves; Arcachon lagoon; Tidal inlet; Modelling; Morphodynamic; Dérive littorale; Transport sédimentaire; Marée; Houle; Bassin d'Arcachon; Modèle; Morphodynamique.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/1996/these-4520.pdf
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Modelisation numerique du flambage de panneaux sandwich raidis ArchiMer
Batoz, J; Quesnel, T.
This paper presents a numerical method for the buckling analysis of stiffened sandwich panels for ship building with composite materials. The formulation of a multi-layered quadrilateral finite element of a plane shell including transverse shear effects is presented. Some classical tests allow the performance of this element to be evaluated for composite plates. Then an explanation is given for a method used for analyzing the buckling of panels.
Tipo: Text Palavras-chave: Ship technology; Composite materials; Modelling; Mathematical models; Numerical analysis; Eléments finis; Plaque coque; Flambage; Structure sandwich; Matériau composite.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1074.pdf
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Modelling abrupt glacial North Atlantic freshening: Rates of change and their implications for Heinrich events ArchiMer
Bigg, Grant R.; Levine, Richard C.; Green, Clare L..
The abrupt delivery of large amounts of freshwater to the North Atlantic in the form of water or icebergs has been thought to lead to significant climate change, including abrupt slowing of the Atlantic Ocean meridional overturning circulation. In this paper we examine intermediate complexity coupled modelling evidence to estimate the rates of change, and recovery, in oceanic climate that would be expected for such events occurring during glacial times from likely sources around the North Atlantic and Arctic periphery. We show that rates of climate change are slower for events with a European or Arctic origin. Palaeoceanographic data are presented to consider, through the model results, the origin and likely strength of major ice-rafting, or Heinrich,...
Tipo: Text Palavras-chave: Heinrich events; Modelling; Quaternary; Icebergs.
Ano: 2011 URL: https://archimer.ifremer.fr/doc/00227/33777/82665.pdf
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Modelling apple flower and fruit damage to frost IPB - Escola Superior Agrária
Melo-Abreu, J.P.M. de; Ribeiro, A.C.; Snyder, R.L..
Good quality apples are grown in relatively cold areas. However, frost frequently causes damage to flowers and small fruits. When the percentage of frost damage losses is higher than the thinning requirement of the cultivar, production is reduced. In addition to reducing yield, frost damage to the skin and malformation of the fruits often devalues the quality and reduces profits. Critical temperature tables in relation to phenological stage are available for apples and other deciduous crops (Ballard and Proebsting, 1978; Proebsting and Mills, 1978). Some of the data came from field observations using temperatures from standard shelters and some came from excised branch chamber studies. Since plants adapt to the short term temperature environment and there...
Tipo: ConferenceObject Palavras-chave: Frost damage; Apples; Minimum temperature; Modelling.
Ano: 2004 URL: http://hdl.handle.net/10198/4270
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Modelling Climate Change and Agricultural Production in Sub-Saharan Africa (SSA): In Quest of Statistics AgEcon
Koffi-Tessio, Egnonto M..
Climate change is a natural and dynamic phenomenon resulting from complex interrelationships between physical, environmental and human factors. The sustainability of life on earth depends partly on the ability of mankind to maintain this natural and balanced flow of such gases such as carbon dioxide (CO2) and water vapor traping heat. Unfortunately, human beings contribute significantly to the presence of such gases known as Green House Gases (GHGs) through agricultural and industrial activities. The implications are the excess trap of sunlight and the blocking of outward radiation. In sub-Saharan Africa (SSA), the importance of agriculture cannot be stressed enough given that it is central to economic growth and most of economic activities in the region...
Tipo: Conference Paper or Presentation Palavras-chave: Modelling; Agriculture; Climate change; Variability; Statistics; Policies; Environmental Economics and Policy; Farm Management.
Ano: 2009 URL: http://purl.umn.edu/50821
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Modelling crop allocation decision making processes to simulate dynamics of agricultural land uses at farm and landscape level Inra
dury, J.; Schaller, N.; Akplogan, M.; Aubry, C.; Bergez, J.E.; Garcia, F.; Joannon, A.; Lacroix, B.; Martin, P.; Reynaud, A.; Therond, O..
Tipo: Conference Paper Palavras-chave: Farmers' decisions; Crop allocation; Landscape; Decision-making processes; Modelling; Simulation platform.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20097e91935b&uri=/notices/prodinra1/2011/03/
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Modelling growth and reproduction of the Pacific oyster Crassostrea gigas: Advances in the oyster-DEB model through application to a coastal pond ArchiMer
Bourles, Yves; Alunno-bruscia, Marianne; Pouvreau, Stephane; Tollu, Guillaume; Leguay, Didier; Arnaud, Christophe; Goulletquer, Philippe; Kooijman, S.
A bio-energetic model, based on the DEB theory exists for the Pacific oyster Crassostrea gigas. Pouvreau et al. [Pouvreau, S., Bourles, Y., Lefebvre, S., Gangnery, A., Alunno-Bruscia, M., 2006. Application of a dynamic energy budget model to the Pacific oyster, C. gigas, reared under various environmental conditions. J. Sea Res. 56, 156–167.] successfully applied this model to oysters reared in three environments with no tide and low turbidity, using chlorophyll a concentration as food quantifier. However, the robustness of the oyster-DEB model needs to be validated in varying environments where different food quantifiers reflect the food available for oysters, as is the case in estuaries and most coastal ecosystems. We therefore tested the oyster-DEB...
Tipo: Text Palavras-chave: Coastal Environment; Temperature effect; Food Quantifiers; Crassostrea gigas; Bivalves; Modelling; DEB theory.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6436.pdf
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MODELLING IMPACTS OF SOME EUROPEAN BIOFUEL MEASURES AgEcon
Ledebur, Oliver von; Salamon, Petra; Zimmermann, Andrei; van Leeuwen, Myrna; Tabeau, Andrzej A.; Chantreuil, Frederic.
Against the background of increasing concerns regarding the energy supply security as well as environmental concern the interest for renewable energy sources has increased in recent years. The biofuel sector, backed by public policies, experienced a strong increase in and outside Europe. A methodology that allows for the estimation of the impacts of the fulfilment of the proposed biofuel targets in the EU member states is proposed and implemented in the AGMEMOD model for France and Germany. The so called normative approach, based on the use of a logistic function as biofuel demand function allows to perform simulations to assess the impact of the biofuel demand expansion on agricultural markets. The implemented approach and the simulation results indicate...
Tipo: Conference Paper or Presentation Palavras-chave: Biofuel targets; Biodiesel; Ethanol; Modelling; Crop Production/Industries; Public Economics; Resource /Energy Economics and Policy.
Ano: 2008 URL: http://purl.umn.edu/6649
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Modelling larval dispersal and settlement of the reef-building polychaete Sabellaria alveolata: Role of hydroclimatic processes on the sustainability of biogenic reefs ArchiMer
Ayata, Sakina-dorothee; Ellien, Celine; Dumas, Franck; Dubois, Stanislas; Thiebaut, Eric.
The honeycomb worm Sabellaria alveolata forms biogenic reefs which constitute diversity hotspots on tidal flats. The largest known reefs in Europe, located in the Bay of Mont-Saint-Michel (English Channel), are suffering increasing anthropogenic disturbances which raise the question of their sustainability. As the ability to recover depends partly on the recolonization of damaged reefs by larval supply, evaluating larval dispersal and the connectivity between distant reefs is a major challenge for their conservation. In the present study, we used a 3D biophysical model to simulate larval dispersal under realistic hydroclimatic conditions and estimate larval retention and exchanges among the two reefs of different sizes within the bay. The model takes into...
Tipo: Text Palavras-chave: Bay of Mont Saint Michel; English Channel; Modelling; Larval settlement; Larval transport; Connectivity; Biogenic reefs; Sabellaria alveolata.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6841.pdf
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Modelling mass transfer during water absorption of closed mouth pistachios CIGR Journal
Kouchakzadeh, Ahmad; Tajri, Behnam.
This study was undertaken to analyze the kinetics of water absorption and to derive an equation for the rate at which water is absorbed by closed mouth pistachios.  We used Kaleh_ghoochi, the major variety of Iranian pistachios.  The water-absorption rate equation of closed mouth pistachios between 5°Cand 25°Cwas presumed based on the Peleg equation.  The Peleg coefficients k1 and k2 were negligible changed with water temperature depending on the product and can be useful in estimating approximate immersing time and temperature for splitting mouth of pistachios.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pistachios; Water absorption; Peleg equation; Modelling.
Ano: 2017 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3907
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Modelling of the rotational - vibration generator for the flow fruit detachers CIGR Journal
Ishpekov, Stoyan Savov.
The investigation aims at modelling the dynamics of rotational vibration generator, which is widely used for driving flow fruit detachers at harvesting of many crops like grape, tomatoes, blueberries, raspberries, chokeberry, black currant, sesame seeds etc. The research on this model has been digitally performed by software, written in FORTRAN and by using the LabView environment as input-output interface. Identification of unknown model coefficients has been carried and their influence upon precision of the model has been determined. The effect of vibration generator parameters upon its dynamic characteristics has been defined. The synthesized model reaches a relative error for the carrier angular amplitude of 0.48 % compared to the one, determined by an...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural engineering flow fruit detacher; Rotation vibration generator; Modelling.
Ano: 2018 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3940
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Modelling paralytic shellfish toxins (PST) accumulation in Crassostrea gigas by using Dynamic Energy Budgets (DEB) ArchiMer
Pousse, Emilien; Flye-sainte-marie, Jonathan; Alunno-bruscia, Marianne; Hegaret, Helene; Rannou, Eric; Pecquerie, Laure; Marques, Goncalo M.; Thomas, Yoann; Castrec, Justine; Fabioux, Caroline; Long, Marc; Lassudrie, Malwenn; Hermabessiere, Ludovic; Amzil, Zouher; Soudant, Philippe; Jean, Fred.
As other filter-feeders, Crassostrea gigas can concentrate paralytic shellfish toxins (PST) by consuming dinoflagellate phytoplankton species like Alexandrium minutum. Intake of PST in oyster tissues mainly results from feeding processes, i.e. clearance rate, pre-ingestive sorting and ingestion that are directly influenced by environmental conditions (trophic sources, temperature). This study aimed to develop a mechanistic model coupling the kinetics of PST accumulation and bioenergetics in C. gigas based on Dynamic Energy Budget (DEB) theory. For the first time, the Synthesizing Units (SU) concept was applied to formalize the feeding preference of oysters between non-toxic and toxic microalgae. Toxin intake and accumulation were both dependent on the...
Tipo: Text Palavras-chave: Alexandrium minutum; Paralytic shellfish toxins (PST); Dynamic Energy Budget (DEB); Modelling; Pacific oyster.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00455/56662/58407.pdf
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Modelling Policies for Multifunctional Agriculture and Rural Development in a Remote EU Region (Caithness & Sutherland, Scotland, UK) AgEcon
Bergmann, Holger; Thomson, Kenneth J..
A modified version of a system dynamics model constructed for an EU-wide case-study project (TOPMARD) using STELLA software was used to simulate the effects of a number of development scenarios for a remote rural area in Northern Scotland, i.e. Caithness & Sutherland, which is characterised by multifunctional agriculture. In this paper, the context of the modelling work in policy and socioeconomic terms is first described. This is followed by the specification of the model and of the modelling scenarios, one of which relates to the “decommissioning” (run-down) of a major industrial site (Dounreay) within the area. The modelling results are discussed, in terms of regional population, land use, economic and other terms, from 2001 to 2015/2031. Finally,...
Tipo: Conference Paper or Presentation Palavras-chave: Modelling; Multifunctionality; Input-output; Systems dynamics; Rural policy; Agricultural and Food Policy; Community/Rural/Urban Development; Public Economics; Research Methods/ Statistical Methods.
Ano: 2008 URL: http://purl.umn.edu/6596
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Modelling the CAP Reform at the Regional Level with ProLand AgEcon
Weinmann, Bernd; Sheridan, Patrick; Schroers, Jan Ole; Kuhlmann, Friedrich.
The reform of the European Common Agricultural Policy (CAP) will fundamentally affect the decision behaviour of land users. So far transfer payments were coupled to specific forms of land use. The reform encourages land users to make decisions concerning production based solely on market aspects. The effects of the CAP reform on the Lahn Dill region in Germany are simulated with the spatially explicit land use model ProLand. The results show that land use decisions will be based stronger on site specific natural conditions than was the case in the Agenda 2000 scenario. The transfer payment volume directed into the region increases considerably.
Tipo: Conference Paper or Presentation Palavras-chave: Modelling; Decision support; Land use; Spatially explicit; Agricultural and Food Policy; Q01.
Ano: 2005 URL: http://purl.umn.edu/24508
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Modelling the Dynamics of Weed Management Technologies AgEcon
Jones, Randall E.; Cacho, Oscar J.; Sinden, Jack A..
An appropriate economic framework for valuing the benefits of weed management technologies is to treat weeds as a renewable resource stock problem. Consequently, the weed seed bank is defined as a renewable resource that changes through time due to management and seasonal conditions. The goal of decision-makers is to manage this (negative) resource so as to maximise returns over some pre-specified period of time. A modelling framework is presented for evaluating the biological and economic effects of weed management. The framework includes population dynamics, water balance, crop growth, pasture growth and crop/pasture rotation models for measuring the physical interactions between weeds and the environment. These models link in with numerical optimal...
Tipo: Conference Paper or Presentation Palavras-chave: Weeds; Modelling; Dynamic analysis.; Land Economics/Use.
Ano: 2003 URL: http://purl.umn.edu/57902
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Modelling the effects of macrofauna on sediment transport and bed elevation: Application over a cross-shore mudflat profile and model validation ArchiMer
Orvain, Francis; Le Hir, Pierre; Sauriau, Pierre-guy; Lefebvre, Sebastien.
Tipo: Text Palavras-chave: Modelling; Sediment dynamics; Erodability; Bioturbation; Macrofauna; Biota; Sediment stability.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00079/19055/18610.pdf
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Modelling the non Fickian water absorption in polyamide 6 ArchiMer
Arhant, Mael; Le Gac, Pierre-yves; Le Gall, Maelenn; Burtin, Christian; Briancon, Christophe; Davies, Peter.
This paper investigates the water absorption of polyamide 6. The high amount of absorbed water in the polymer and the large resulting decrease in the glass transition temperature (Tg) leads to a non Fickian water diffusion when samples are immersed, which is a significant difficulty when trying to model the water profile in thick specimens. The aim of this study is to be able to model this particular behaviour based on physical considerations. First, it is shown that the non Fickian water diffusion is caused by an increase in the diffusivity during water absorption. Two cases are then identified; one below Tg where the diffusivity is described using an Arrhenius law and one above Tg based on the free volume theory. Then, these two laws are implemented in a...
Tipo: Text Palavras-chave: Water absorption; Free volume; Polyamide 6; Sea water; Modelling.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00350/46158/45856.pdf
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Models and indicators for assessing conservation and fisheries-related effects of marine protected areas ArchiMer
Pelletier, Dominique; Claudet, Joachim; Ferraris, J; Benedetti Cecchi, L; Garcia Charton, J.
Two kinds of approaches have been used for assessing conservation and fisheries-related effects of marine protected areas (MPAs): (i) statistical modelling based on field data and (ii) mathematical modelling quantifying the consequences of MPAs on the dynamics of populations, communities, and fisheries. Statistical models provide a diagnostic on the impact of MPAs on the ecosystem and resources; they are also needed for devising and assessing sampling designs for monitoring programs. Dynamic models enable exploration of the consequences of MPA designs and other management policies. We briefly review how each of these approaches has been implemented up to now in the literature and identify potential indicators of MPA effects that can be obtained from each...
Tipo: Text Palavras-chave: Ecosystem conservation; Fisheries management; Modelling; Indicators; Marine Protected Areas.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4229.pdf
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Moisture sorption isotherms and thermodynamic properties of Asteriscus graveolens leaves CIGR Journal
Saad, Amel; Touati, Boumediene; Draoui, Belkacem; Tabti, Boufeldja; Abdenebi, Asma; Mir, Krima.
Asteriscus graveolens is a medicinal and aromatic plant which has been used to treat several diseases.Moisture equilibrium data of the plant leaves were determined by using the gravimetric static method at 30°C, 40°C, and 50°C for water activity (
Tipo: Info:eu-repo/semantics/article Palavras-chave: Moisture sorption; Isotherm; Asteriscus graveolens; Isosteric heat; Modelling.
Ano: 2016 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3585
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Multiple model approach to modelling of Escherichia coli fed-batch cultivation extracellular production of bacterial phytase Electron. J. Biotechnol.
Roeva,Olympia; Pencheva,Tania; Tzonkov,Stoyan; Arndt,Michael; Hitzmann,Bernd; Kleist,Sofia; Miksch,Gerchard; Friehs,Karl; Flaschel,Erwin.
The paper presents the implementation of multiple model approach to modelling of Escherichia coli BL21(DE3)pPhyt109 fed-batch cultivation processes for an extracellular production of bacterial phytase. Due to the complex metabolic pathways of microorganisms, the accurate modelling of bioprocesses is rather difficult. Multiple model approach is an alternative concept which helps in modelling and control of complex processes. The main idea is the development of a model based on simple submodels for the purposes of further high quality process control. The presented simulations of E. coli fed-batch cultivation show how the process could be divided into different functional states and how the model parameters could be obtained easily using genetic algorithms....
Tipo: Journal article Palavras-chave: Genetic algorithms; Modelling; Multiple model approach.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400012
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