Littérature scientifique sur le sujet « Vents faibles »
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Articles de revues sur le sujet "Vents faibles"
Kemka, N., T. Njine, S. H. Zébazé Togouet, D. Niyitegeka, M. Nola, A. Monkiedje, J. Demannou et S. Foto Menbohan. « Phytoplancton du lac municipal de Yaoundé (Cameroun) : Succession écologique et structure des peuplements ». Revue des sciences de l'eau 17, no 3 (12 avril 2005) : 301–16. http://dx.doi.org/10.7202/705535ar.
Texte intégralWadsworth, Frank H., Brynne Bryan et Julio C. Figueroa-Colón. « La productivité potentielle des forêts tropicales surexploitées mérite une évaluation, Puerto Rico ». BOIS & ; FORETS DES TROPIQUES 305, no 305 (1 septembre 2010) : 33. http://dx.doi.org/10.19182/bft2010.305.a20436.
Texte intégralPhilipps, Nathalia, Pierre P. Kastendeuch et Georges Najjar. « Analyse de la variabilité spatio-temporelle de l’îlot de chaleur urbain à Strasbourg (France) ». Climatologie 17 (2020) : 10. http://dx.doi.org/10.1051/climat/202017010.
Texte intégralMinaker, Leia M., Meghan Lynch, Brian E. Cook et Catherine L. Mah. « Analyse de données sur les ventes lors d'une intervention axée sur un dépanneur santé de Toronto : le projet FRESH sur l'environnement de la vente d’aliments au détail comme déterminant de la santé ». Promotion de la santé et prévention des maladies chroniques au Canada 37, no 10 (octobre 2017) : 383–91. http://dx.doi.org/10.24095/hpcdp.37.10.04f.
Texte intégralISANGU MWANA M’FUMU, Augustin, Moise KALAMBAIE BIN MUKANYA et Jean Pierre USOTILA WATA NGO IBEYA. « Stratégies d’adaptation des maraîchers face aux changements climatiques en République Démocratique du Congo. Cas des vallées de Kimwenza et Lukaya dans la Commune de Mont-Ngafula, Ville Province de Kinshasa. » Revue Congo Research Papers 4, no 2 (10 juillet 2023) : 73–111. http://dx.doi.org/10.59937/hxrc3041.
Texte intégralAliango Marachto, Dede, et Princia Ntumba Baruani. « LA MICROFINANCE VERTE : VERS UNE INTEGRATION DU DISCOURS DE TRIPLE PERFORMANCE PAR LES INSTITUTIONS DE MICROFINANCE CONGOLAISES ». International Journal of Advanced Research 12, no 02 (29 février 2024) : 681–92. http://dx.doi.org/10.21474/ijar01/18345.
Texte intégralBENOIT, M., et A. BRELURUT. « Elevage du cerf (Cervus elaphus) dans l’ouest de la France. Résultats techniques et économiques ». INRAE Productions Animales 9, no 2 (17 avril 1996) : 121–31. http://dx.doi.org/10.20870/productions-animales.1996.9.2.4041.
Texte intégralFouet, Monique, et Françoise Milewski. « Vents contraires ». Revue de l'OFCE 38, no 4 (1 novembre 1991) : 5–64. http://dx.doi.org/10.3917/reof.p1991.38n1.0005.
Texte intégralCultiaux, John, et Harmony Glinne. « Adapter le travail aux travailleurs dits « faibles ». Un enjeu social et managérial ». Forum 166-167, no 2 (27 août 2023) : 71–82. http://dx.doi.org/10.3917/forum.166.0071.
Texte intégralCrétat, Julien, Yves Richard, Olivier Planchon, Justin Emery, Melissa Poupelin, Mario Rega, Julien Pergaud et al. « Impact de la topographie et de la circulation atmosphérique sur l’îlot de chaleur urbain en situation de canicule (Dijon, France) ». Climatologie 20 (2023) : 10. http://dx.doi.org/10.1051/climat/202320010.
Texte intégralThèses sur le sujet "Vents faibles"
Balde, Hambaliou. « Modélisation de la pollution atmosphérique de scalaires passifs par faibles vents ». Thesis, Evry-Val d'Essonne, 2011. http://www.theses.fr/2011EVRY0001/document.
Texte intégralThe most intense air pollution episodes occur in situations of low winds. The air pollution models overestimate or underestimate the levels in these conditions, according to models of standard deviations (σi with i = x, y, z) dispersion which they are associated. This was highlighted in the irst part of this thesis where we evaluated the efficacy of five models of dispersal patterns associated with six standard deviations, using five international databases. In the second part, we have developed two models of dispersal standard deviations (S_LMEE_Ond and S_LMEE_Taylor) from experimental databases appropriate. It has been shown and for light winds, the wind speed is non-stationary and ischaracterized by rapid fluctuations (random or turbulent) and slow fluctuations (organized). Turbulent fluctuations promote mixing of particles within the plume and slow fluctuations leading to their horizontal transport. Models of deviations developed in this thesis seem more appropriate to study the dispersion of particles by low winds. The model is based on the module S_LMEE_Taylor average wind speed (V) and standard deviations of fluctuations organized (σu and σv). ARX models and multivariate autoregressive have been developed in MATLAB to predict these parameters with a 10 min and 30 min
Alam, Boulos. « Modélisation numérique de la turbulence et de la dispersion atmosphérique par faibles vents en milieu urbain ». Electronic Thesis or Diss., université Paris-Saclay, 2023. https://www.biblio.univ-evry.fr/theses/2023/interne/2023UPAST179.pdf.
Texte intégralThis thesis is situated in the context of atmospheric dispersion modeling, particularly in the presence of low winds. Atmospheric pollution sources, often located near the ground and influenced by complex obstacles, generate high concentrations of pollutants nearby, resulting in significant concentration fluctuations. Low winds, typically associated with stable atmospheric conditions, pose a specific challenge in modeling pollutant dispersion, requiring a thorough analysis of meteorological data and adaptation of prediction models. To address this complex challenge, the use of Computational Fluid Dynamics (CFD) is necessary, although further research is needed to validate its effectiveness in the near-field and in the presence of low winds. The Code_Saturne® software (EDF R&D) is selected due to its proven efficiency in simulating atmospheric pollutant dispersion. This thesis is divided into three distinct phases : the first phase focuses on the fundamentals of atmospheric dispersion, exploring the impact of various parameters such as the atmospheric boundary layer structure, atmospheric turbulence, and atmospheric stability. These elements play a crucial role in how pollutants disperse in the air. The second phase details the methodology used in Code_Saturne for conducting simulations, including the turbulence models employed and the criteria for evaluating these models. In addition to traditional isotropic models, this research investigates the use of anisotropic turbulence models to study dispersion in various contexts. The third phase of the thesis concentrates on the evaluation of different turbulence models and velocity-scalar correlations using observations conducted in urban environments under neutral and stable atmospheric conditions. Finally, the last phase of the research explores conditions of low and stable winds, typically characterized by wind speeds below 2 m/s and random wind variations. This phase examines the meandering patterns in pollutant dispersion and assesses the limitations of analytical and CFD models in predicting concentration in such conditions. To this end, a URANS model is developed and evaluated. Ultimately, a segmented Gaussian method is devised to compare the results with CFD predictions and field observations
Carre, Aurélien. « Miniaturisation bioinspirée d'un convertisseur aéromécanique pour l'exploitation des faibles vitesses de vent ». Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAA012.
Texte intégralThe Internet of Things is growing rapidly, and requires the development of autonomous communicating sensors. The autonomy of such sensors can be achieved by harvesting ambient energy in order to limit the use of batteries. The objective of the thesis is to extend the conversion possibilities by developing a micro wind turbine as small as possible to recover the kinetic energy of low wind speeds. A break in geometry is necessary and is based in this work on biomimetics.To this end, a study of samaras behaviour by stereo image correlation is being carried out to reconstruct their movement in three dimensions. In a first case, the samaras fall vertically; in a second configuration they are drilled at the location of their center of rotation and placed on a horizontal axis inside a wind tunnel. The samaras rotate up to 89% faster than in free fall with almost 2000 rev/min: thus they are a good model for efficient micro wind turbine blades.Then, several bioinspired propellers are designed and manufactured by stereolithography. The propellers are then assembled with a miniature electromagnetic generator made at the CEA Grenoble. The best of them is identified after a battery of tests. Thereafter, the efficiency of the optimal micro wind turbine is verified by measuring the powers developed for a wide range of winds (up to 8 m/s). The maximum power ranges from 50 µW for 1.2 m/s to more than 80 mW at 8 m/s; the optimal power coefficient and total efficiency appear at 4 m/s and are respectively 29% and 17.5%. This places us above the best prototypes in literature. Therefore, the validity of the initial choice of biomimicry and its contribution to small dimensions is confirmed
Yvart, Walter. « Signatures moléculaires dans les vents de disque MHD des proto-étoiles de faible masse ». Phd thesis, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-00880647.
Texte intégralDruga, Mirela. « Méthodologie de conception d’aérogénérateurs optimaux, à faible coût, à destination des sites isolés ». Le Havre, 2011. http://www.theses.fr/2011LEHA0021.
Texte intégralThe strong increase of the small wind turbine production requires the review of the existing technologies to suit the expanding need. This thesis develops a design and optimal sizing methodology of stand alone wind systems. The statistical profile of wind resource, the expected consumption and the specification targets are taken into account. Our choice of generator is based on PMSM, in order to maximize the efficiency of the wind energy conversion within economically viable topologies. This study highlights different possible scenarios to drive the system and predicts how to take into account the system control. The simulation using a recorded wind data allowed the validation of our models in real situations. Our software approach advantages are modularity and adaptability. By choosing the relevant settings for each system element and using our results as database, a multi-criteria constrained optimization method can be applied. Therefore a library of models depending on the site and its energy demand could be built in order to expand our approach. The developed code has the ability to generate optimal sizing, where the cost per kWh is taken into account, which is a critical point for manufacturers and users
Domps, Baptiste. « Identification et détection de phénomènes transitoires contenus dans des mesures radar à faible rapport signal à bruit : Applications conjointes aux problématiques océanographique et atmosphérique ». Electronic Thesis or Diss., Toulon, 2021. http://www.theses.fr/2021TOUL0001.
Texte intégralObservations of atmospheric and ocean surface dynamics can be performed via radar remote sensing. The usual approach consists, in both cases, in numerically calculating the Doppler spectrum of the received temporal echoes using a discrete Fourier transform. Although satisfactory for most applications, this method is not suitable for observations of transient phenomena due to being shorter than the integration time required for radar observations. We use an alternative technique based on an autoregressive representation of the radar time series combined with the maximum entropy method. This approach is applied to coastal radar measurements of surface currents in the high frequency band as well as to L-band radar measurements of wind in the lower atmosphere. For both cases, through numerical simulations and case studies, we compare our approach with others that use different instruments. We show that for short integration times, where conventional methods fail, our proposed approach leads to reliable estimates of geophysical quantities (ocean currents and wind speeds)
Boyer, Patrick. « Contribution à l'étude de la dispersion des polluants dans les basses couches de l'atmostphère en situations stables et par vent faible ». Aix-Marseille 2, 1995. http://www.theses.fr/1995AIX22102.
Texte intégralFernet, Catherine. « Réduction du ruissellement par l’augmentation de surfaces perméables : évaluation de 2 scénarios d’aménagement d’un ensemble résidentiel à Laval ». Thèse, 2013. http://hdl.handle.net/1866/10044.
Texte intégralThe widespread introduction of new residential developments in the urban periphery is partly responsible for declining vegetation cover and a large scale increase in impervious surfaces. Cities are now grappling with a constant increase in runoff, which they have to manage through a vast network of sewers and drains. Data on the impacts of current residential models reveal that this form of development causes the degradation of natural and aquatic environments. The present study aims to test Open space design strategy by comparing the effect of three development situations on the weighted runoff coefficient (Cw). The three situations are 1: the actual development as conceived by the project’s promoter; 2: development aimed at preserving existing streams, reducing lot sizes and impervious surfaces; and 3: a higher-density cluster development plan. The weighted coefficients obtained are 0.50 for scenario 1, 0.40 for scenario 2 and 0.34 for scenario 3. As a result, it appears that the density of the structures, the nature of the surfaces and the spatial organization can all contribute to reducing the runoff in a given area. This study underlines the importance of runoff management in planning and land use.
Livres sur le sujet "Vents faibles"
Grijol, Karine. La faiblesse du vent : Impacts, enjeux et contradictions de l'éolien en France. Paris : François Bourin, 2012.
Trouver le texte intégralChapitres de livres sur le sujet "Vents faibles"
Tchagnaou, Akimou, Sena Yawo Akakpo-Noumado, Kossi Eli Senayah, Ella Djagnikpo et Mensah Devi. « Supervision pédagogique et qualité de l’enseignement au Togo ». Dans Langues, formations et pédagogies : le miroir africain, 65–88. Observatoire européen du plurilinguisme, 2018. http://dx.doi.org/10.3917/oep.agbef.2018.02.0065.
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