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Registros recuperados: 293
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/1IRD/4Paris/5FRA (ed.); /1SPERA/2South Pacific Radioactivity Association/4Menais/5AUS (ed.) IRD
Crawford, J.; Domel, R.U.; Twining, J.R.; Harris, F.F..
Tipo: Text Palavras-chave: POLLUTION; ATMOSPHERE; MODELISATION; SIMULATION; SYSTEME INFORMATIQUE; SURVEILLANCE; INDICATEUR ECOLOGIQUE; RADIOELEMENT; INDICATEUR BIOLOGIQUE.
Ano: 2002 URL: http://www.documentation.ird.fr/hor/fdi:010032711
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A computation method in robust Bayesian decision theory Inra
Abraham, C..
We propose a method for computing the range of the optimal decisions when the utility function runs through a class u. The class u has constraints on the values and the shape of the utility functions. A discretization method enables to easily approximate the optimal decision associated with a particular utility function u is an element of u . The range of optimal decisions is computed by a Monte Carlo optimization method. An example is provided with numerical results.
Tipo: Journal Article Palavras-chave: DECISION OPTIMALE; DISCRÉTISATION; RECUIT SIMULÉ; ROBOTIQUE; SIMULATION; PROBABILITÉ; METHODE DE MONTE CARLO; INTELLIGENCE ARTIFICIELLE; INFERENCE BAYESIENNE BAYESIAN INFERENCE; GLOBAL ROBUSTNESS; CLASS OF UTILITY FUNCTIONS; OPTIMAL DECISIONS; DISCRETIZATION; MONTE CARLO OPTIMISATION; SIMULATED ANNEALING.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009d7cfcf55&uri=/notices/prodinra1/2010/12/
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A modeling study on the use of passive microwave data for the monitoring of sparsely vegetated land surfaces IRD
Lo Seen, D.; Chehbouni, Abdelghani; Njoku, E.; Saatchi, S..
Tipo: Text Palavras-chave: INTERFACE VEGETATION ATMOSPHERE; SURFACE DU SOL; COUVERT VEGETAL; PRAIRIE; FONCTIONNEMENT DE L'ECOSYSTEME; BILAN HYDRIQUE; BILAN ENERGETIQUE; METHODE D'ANALYSE; TELEDETECTION; HYPERFREQUENCE; SIMULATION; MODELISATION; ETUDE EXPERIMENTALE.
Ano: 1995 URL: http://www.documentation.ird.fr/hor/fdi:010020953
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A new two-scale model describing drying dynamics and coupled heat and mass transfer in a porous medium: application to the combined vacuum drying and radiative heating of wood Inra
Turner, I.; Perré, P..
In this work a two-scale modelling approach is used to investigate the vacuum drying of a board placed in an experimental vacuum chamber, whereby two infrared emitters with reflectors are used to supply heat to the product. The kiln (large) scale model allows the evolution of the masses of vapour, air and water in the chamber, together with the temperatures of the vacuum chamber and the IR emitters to be monitored throughout the drying process. Such a model enables condensation on the kiln walls to be accounted for in the evolution of the relative humidity within the chamber. The comprehensive two-dimensional drying model, known as Transpore, is used to determine the heat and mass transfer at the (macro) scale of the board. The knowledge of the vacuum...
Tipo: Conference Paper Palavras-chave: BOIS; SECHAGE; CHAUFFAGE RAYONNANT; SECHAGE PAR LE VIDE; MILIEU POREUX; MODELE; TRANSFERT DE MASSE; TRANSFERT DE CHALEUR; SIMULATION.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009204c193e&uri=/notices/prodinra1/2011/01/
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A novel method for the sustainable management of wheat crops: exploration by simulation Inra
Chatelin, M.H.; Aubry, C.; Garcia, F..
Designing crop management strategies to meet both environmental and economic objectives is a growing preoccupation for advisers and researchers, in the move towards sustainable development. We describe here a simple and original method designed to facilitate this task and appropriate field experimentation. This method involves the use of a multi-stage procedure in which a simulation tool is used to explore a decisional space defined by an expert. As a case study, we designed crop management strategies for winter wheat in the Paris Basin. We aimed to maintain a high wheat yield of more than 9 t.ha-1 and grain quality whilst limiting the risks of nitrogen pollution by maintaining post-harvest soil nitrogen content below 30 kg.ha-1. The method was applied on...
Tipo: Journal Article Palavras-chave: CROP MODEL; SIMULATION; DECISION SUPPORT SYSTEM; WINTER WHEAT; EXPLORATION.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20084a9b0b79&uri=/notices/prodinra1/2010/08/
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A simulation model of artisanal fisheries of Senegal IRD
Laloë, Francis; Samba, A..
A simulation model was designed to correspond to a Senegalese artisanal fishery. Each fishing unit has a strategy, and at a given time chooses a tactic from a set available tactics, according to a decision rule taking into account expected "revenues". The multispecies resource is modelled with simple stock production models, assuming quantities of biomass are inaccessible, depending on the resource component, season and tactic. We compare the results of two simulations with the same number of fishing units, the same gears, and the same resource, but with different strategies. One set of strategies has smaller sets of tactics available than the other. Results indicate the importance of flexibility of the fishermen, which must be taken into account in...
Tipo: Text Palavras-chave: PECHE ARTISANALE; PECHE MULTISPECIFIQUE; STOCK; MODELISATION; SIMULATION.
Ano: 1991 URL: http://www.documentation.ird.fr/hor/fdi:37898
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A simulation model of rice sheath blight epidemics. 1 : structure and model development. 2 : model performance derived from sensivity analysis IRD
Savary, Serge; Willocquet, Laetitia.
Tipo: Text Palavras-chave: RIZ; MALADIE DES PLANTES; EPIDEMIOLOGIE; CHAMPIGNON PARASITE; MODELISATION; SIMULATION; ETUDE EXPERIMENTALE.
Ano: 1996 URL: http://www.documentation.ird.fr/hor/fdi:010018330
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A simulation model of vertical movements of an earthworm population (Millsonia anomala Omodeo, Megascolecidae) in an African savanna (Lamto, Ivory Coast) IRD
Martin, S.; Lavelle, P..
Tipo: Text Palavras-chave: FAUNE DU SOL; LOMBRIC; DISTRIBUTION SPATIALE; VARIATION TEMPORELLE; MODELISATION; SIMULATION; MODELE DRILOTROP.
Ano: 1992 URL: http://www.documentation.ird.fr/hor/fdi:38606
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Age dependent fecundity and the dynamics of a density-dependent population model IRD
Le Page, Christophe; Cury, Philippe.
The Ricker stock-recruitment (SR) relationship is one of the most commun mathematical models used in fishery science. Without age-structure, this model is a first-order difference equation that shares with other and similar non-linear models complicated behaviors, including chaotic ones. As many animal populations have demographic characteristics that differ with age, the importance of considering age-structure within population dynamics models may be critical. Introducing age-structure in the Ricker model considerably complicates the behavior of the population-dynamicss due to a great sensitivity to life-history parameters. The goal of this study is to explore some of those behaviors. A discrete self-regenarating and age-structured model, based on the...
Tipo: Text Palavras-chave: MODELE MATHEMATIQUE; POISSON MARIN; DYNAMIQUE DE POPULATION; FECONDITE; MORTALITE; SIMULATION; OCEANOGRAPHIE DES PECHES; MODELE DE RICKER.
Ano: 1995 URL: http://www.documentation.ird.fr/hor/fdi:41660
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Ajuste da curva de descarga com base em simulaçao : rio Donato IRD
Pedrollo, O.C.; Tucci, C.E.M.; Chevallier, Pierre.
Tipo: Text Palavras-chave: COURS D'EAU; DYNAMIQUE DE L'EAU; MESURE AU SOL; SURFACE DU SOL; SIMULATION; DRAINAGE; BASSIN VERSANT; CONFIGURATION DU LIT; MODELE MATHEMATIQUE.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:010009669
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Ajustement d'un modèle de bilan hydrique à des mesures tensio- neutroniques in situ sous culture de maïs IRD
Freteaud, J.P.; Poss, Roland; Saragoni, H..
Tipo: Text Palavras-chave: SOL NU; SOL CULTIVE; EVOLUTION DES SOLS SOUS CULTURE; BILAN HYDRIQUE; ETUDE EXPERIMENTALE; MESURE IN SITU; SIMULATION; EVAPOTRANSPIRATION; DRAINAGE; ANALYSE DE CORRESPONDANCE.
Ano: 1987 URL: http://www.documentation.ird.fr/hor/fdi:30740
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Alimentation en eau potable de Nouméa à partir de la Dumbéa : évaluation des ressources en eau, simulation du fonctionnement des aménagements, étude des crues extrêmes de la Dumbéa IRD
Danloux, Joël; Pouget, Jean-Christophe; Tourasse, P..
Tipo: Text Palavras-chave: BASSIN VERSANT; RESSOURCES EN EAU; EAU POTABLE; ESTIMATION; PLUVIOMETRIE; HYDROMETRIE; DEBIT; REGIME HYDROLOGIQUE; ANALYSE STATISTIQUE; BESOIN EN EAU; AMENAGEMENT HYDRAULIQUE; SIMULATION; CRUE.
Ano: 1995 URL: http://www.documentation.ird.fr/hor/fdi:010004197
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Amélioration du régime hydrique des sols dégradés en vue de leur réhabilitation : cas des vertisols du nord-Cameroun IRD
Massé, Dominique.
Tipo: Text Palavras-chave: SOL DEGRADE; BILAN HYDRIQUE; PRATIQUE CULTURALE; SIMULATION; SOL HARDE; RESTAURATION DU SOL.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:37456
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Aménagement de basse chute Ouenghi : débits moyens journaliers disponibles en basses eaux sur la Ouenghi en amont de la RT 1 IRD
Danloux, Joël.
Tipo: Text Palavras-chave: AMENAGEMENT HYDRAULIQUE; CHUTE D'EAU; DEBIT; BASSES EAUX; COURS D'EAU; BASSIN VERSANT; EVALUATION; SIMULATION.
Ano: 1987 URL: http://www.documentation.ird.fr/hor/fdi:010020592
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Aménagement des vallées de la Sasomangana et de la Ranofotsy en liaison avec la cuvette de Didy : élaboration des données hydrologiques pour le modèle de simulation Didy-1 IRD
Dosseur, H..
Tipo: Text Palavras-chave: AMENAGEMENT DES EAUX; RESSOURCES EN EAU; SIMULATION; MODELE HYDROLOGIQUE; BILAN HYDROLOGIQUE; JAUGEAGE; DEBIT; VARIATION JOURNALIERE; VARIATION MENSUELLE; STATION HYDROLOGIQUE; BASSIN VERSANT; MODELE DE DIDY 1.
Ano: 1981 URL: http://www.documentation.ird.fr/hor/fdi:00409
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Aménagement hydro-électrique de Garafiri sur le Konkouré (Guinée) : mise à jour de l'hydrologie IRD
Tipo: Text Palavras-chave: AMENAGEMENT HYDROELECTRIQUE; STATION HYDROLOGIQUE; HYDROMETRIE; COURS D'EAU; MODELE; SIMULATION; ANALYSE STATISTIQUE; ESTIMATION; CRUE; DEBIT; JAUGEAGE; ETALONNAGE; BASSIN VERSANT.
Ano: 1994 URL: http://www.documentation.ird.fr/hor/fdi:010020124
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Aménagement intégré du bassin du Meu : simulation de fonctionnement des divers systèmes d'alimentation en eau de Rennes IRD
Dubreuil, Pierre; Herbaud, Jacques.
Tipo: Text Palavras-chave: ALIMENTATION EN EAU; AMENAGEMENT DES EAUX; BESOIN EN EAU; EQUIPEMENT; SIMULATION; METHODE; PROGRAMME; DEBIT; ORGANIGRAMME.
Ano: 1970 URL: http://www.documentation.ird.fr/hor/fdi:14375
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An approach to freshwater cyanobacterial production and excretion : tentative application of a deterministic model Inra
Vallaeys, T.; Feuillade, J.; Feuillade, M..
Nous avons estimé les taux de photosynthèse, de respiration et d'excrétion carboné chez Oscillatoria rubescens D.C. sous une gamme de conditions d'éclairement comprise entre 0 et 60 μE m−1 s−1 grâce à l'emploi de la méthode au14C. Un modèle d'évolution du carbone chez la cyanobactérie s'appuyant sur les équations de Hobsonet al. (1976) et prenant en compte la respiration et l'excrétion cellulaire est présenté. Ce modèle prévoit que la somme des taux de respiration et d'excrétion doit croître plus rapidement avec la lumière que le taux de photosynthèse. Il montre par ailleurs que la croissance maximale de la souche étudiée d'O. rubescens doit être trouvée à faible intensité lumineuse, environ 20 μE m−2 s−1. La lumière semble provoquer un accroissement...
Tipo: Journal Article Palavras-chave: EXCRETION CARBONEE; CARBONE 14; CYANOBACTERIE CYANOBACTERIUM; OSCILLATORIA RUBESCENS; PHOTOSYNTHETIC RATE; EXCRETION RATE; RESPIRATION RATE; 14CARBON; SIMULATION; MATHEMATICAL MODEL.
Ano: 1989 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9100014376019561&uri=/notices/prodinra1/2011/03/
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An ecophysiological process model for semi-arid grasslands IRD
Nouvellon, Y.; Rambal, S.; Bégué, A.; Lhomme, Jean-Paul; Moran, M.S.; Chehbouni, Abdelghani; Loseen, D..
Tipo: Text Palavras-chave: BILAN HYDRIQUE; BILAN ORGANIQUE; CARBONE; BIOMASSE HERBACEE; CROISSANCE; PHOTOSYNTHESE; RESPIRATION; POTENTIEL HYDRIQUE; PRAIRIE; VARIATION SAISONNIERE; MODELISATION; SIMULATION.
Ano: 1997 URL: http://www.documentation.ird.fr/hor/fdi:010023317
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An individual-based model simulating goat responses variability and long term herd performance Inra
Puillet, L.; Martin, O.; Sauvant, D.; Tichit, M..
Finding ways of increasing the efficiency of production systems is a key issue of sustainability. System efficiency is based on long-termindividual efficiency, which is highly variable and management driven. To study the effects of management on herd and individualefficiency, we developed the model simulation of goat herd management (SIGHMA). This dynamic model is individual-based andrepresents the interactions between technical operations (relative to replacement, reproduction and feeding) and individual biologicalprocesses (performance dynamics based on energy partitioning and production potential). It simulates outputs at both herd and goatlevels over 20 years. A farmer’s production project (i.e. a targeted milk production pattern) is represented by...
Tipo: Journal Article Palavras-chave: SIMULATION; HERD; MANAGEMENT; INDIVIDUAL VARIABILITY; DAIRY GOAT.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010b79606bc&uri=/notices/prodinra1/2011/02/
Registros recuperados: 293
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