Добірка наукової літератури з теми "Lit cohésif"
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Статті в журналах з теми "Lit cohésif":
Boyer, Claudine, and André G. Roy. "Morphologie du lit autour d’un obstacle soumis à un écoulement en couche mince." Géographie physique et Quaternaire 45, no. 1 (December 13, 2007): 91–99. http://dx.doi.org/10.7202/032848ar.
Böhme, Kai. "L’agenda territorial et la politique de cohésion comme instruments de lutte contre les géographies du mécontentement." L'Information géographique Vol. 88, no. 1 (March 6, 2024): 73–89. http://dx.doi.org/10.3917/lig.881.0073.
Segond, Raphaëlle. "Fonds structurels européens et croissance des inégalités territoriales : les services d'approvisionnement en eau et d'assainissement en Bulgarie." L'Information géographique Vol. 88, no. 1 (March 6, 2024): 54–72. http://dx.doi.org/10.3917/lig.881.0054.
Farinós Dasí, Joaquín, and Juana López Pagán. "New Urban-Rural relations in the face of the “Demographic Challenge” in Spain: The Role of Small Intermediary Cities." L'Information géographique Vol. 88, no. 2 (May 29, 2024): 84–107. http://dx.doi.org/10.3917/lig.882.0084.
Nittis, Mélanie. "Le glèndi d’Olymbos, une pratique musicale qui cristallise la cohésion d’un village." L'Information géographique 81, no. 1 (2017): 38. http://dx.doi.org/10.3917/lig.811.0038.
Baudelle, Guy, and Danielle Charles-Le Bihan. "L’Union européenne et les Régions : comment les instruments de la politique de cohésion ont promu l’échelon régional." L'Information géographique Vol. 88, no. 1 (March 6, 2024): 106–20. http://dx.doi.org/10.3917/lig.881.0106.
Vaupot, Sonia. "Cohérence discursive en Slovène et en Français: Le role des connecteurs en traduction." Journal for Foreign Languages 7, no. 1 (December 30, 2015): 57–69. http://dx.doi.org/10.4312/vestnik.7.57-69.
Franck, Christian. "La prise de décision belge en politique extérieure : cohésion, tensions, controle et influences." Res Publica 29, no. 1 (March 31, 1987): 61–84. http://dx.doi.org/10.21825/rp.v29i1.18960.
Koranteng, B. A., A. B. Omojola, O. R. Awodoyin, and A. O. Adediran. "Physicochemical and sensory characteristics of soft cheese as affected by different salt levels." Nigerian Journal of Animal Production 48, no. 5 (November 10, 2021): 124–34. http://dx.doi.org/10.51791/njap.v48i5.3193.
Дисертації з теми "Lit cohésif":
Ralaiarisoa, Velotiana Jean-Luc. "Influence de la cohésion sur le transport éolien de particules : application au sable humide et à la neige." Thesis, Rennes 1, 2020. http://www.theses.fr/2020REN1S065.
This thesis deals with the cohesion effect on the aeolian grain transport. We consider the sand and snow case. A numerical approach to the erosion process by impact allows us to quantify the cohesion effect on the Splash process. Then we adopt wind tunnel experiment to study the effect of the cohesion on the transport. We show over a dry sand bed a transition from the saltation regime to a collision one at a Shields number of 0.3. Over a wet sand bed, the aerodynamic threshold increases with the water content whereas the impact threshold is in the same order of magnitude compare to the dry case. Over a hard snow bed, the characteristic decay height shows a quadratic dependence with the air friction speed and increases with the particle diameter. The characteristics of the aeolian transport over a cohesive snow bed are close to those over a hard one. There is a sharp decrease of the transported snow flux which can increase significantly when the wind tunnel is fed with an incoming snow flux. Our results indicate the mass flow rate aims to a saturation. However the saturation is not reached with the wind-tunnel length we work over wet sand and cohesive snow bed
Zaidan, Jana. "Scοur investigatiοn arοund a bridge pier fοunded in cοhesive sοil". Electronic Thesis or Diss., Normandie, 2023. http://www.theses.fr/2023NORMLH22.
Local scour is considered to be one of the main causes of bridge failure and collapse. Laboratory experiments are a crucial and important approach for the scour process investigation. Yet, there is no robust and standard instrumentation for tracking the evolution of this physical phenomenon in laboratory studies. There are several flume-based studies of scour around a circular bridge pier on cohesionless soil. However, the bed of natural alluvial channels often contains cohesive sediments. Comparatively, there is a limited research on local scour around circular pier founded in cohesive beds that has been documented. In this PhD research, a 3D Laser Scanner is used to monitor scour around a circular pier. The results obtained with this technique, in line with previous research, in particular that carried out on a sandy bed, demonstrate its effectiveness. The technique offers advantages such as continuous spatiotemporal monitoring, but also many limitations. In a next step, the study focused on the effect of the type and proportion of fines in the sediment mixture on the depth and the shape of the scour hole and the temporal propagation of scour process around a circular pier. Results show that increasing the clay in the fine fraction reduce significantly the scour. The mixture with a range around 7.5-10 % of clay fines content provides the threshold composition for coherent soil behavior in scouring process. In addition, scour depth prediction for bridge piers in cohesive soil is not yet fully developed. In engineering practice, scour depth estimation methods currently used are those proposed for sand bed. Many researches aimed to adress a method to optimize the design of bridge piers in the case of cohesive soil. Among the different methods, the one based on the use of the EFA (Erosion Function Apparatus) erodimeter and called SRICOS (Scour Rate In COhesive Soil) was examined as part of this work in order to predict the deepest scour in cohesive bed
Piedra-Cueva, Jose Carlos Ismael. "Contribution à l'étude des mécanismes de transport des sédiments cohésifs." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10200.
Lecomte, Charles-Edouard. "Instabilités dans un milieu granulaire : tôle ondulée sur un lit de sable, et ségrégation au sein des astéroïdes lâches." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEN024/document.
This thesis, consisting of two parts, is focusing on instabilities into a granular assembly.The first part deals with washboard road instability, which is the growth of a ripplepattern on a track subjected to repeated passages of vehicles. Our experimental work aswell as soft spheres numerical simulations provide us a better understanding of this phenomenon.In the case of a rigid wheel dragged at constant velocity, we quantitatively studiedthe impact of the cohesion into the granular media on the main features of the instability :critical velocity, wavelength and growth rates. Finally, we have begun preliminary studieson a yield stress fluid, namely a carbopol microgel.The second part is devoted to the granular segregation in asteroids. Several keys showthat a significant part of them are rubble-piles, without internal cohesion and held togetherby their weak self-gravity. The distribution of grains is heterogeneous : while some regionsconsist in fine sand or powder, large boulders seem to accumulate in other parts. Wenumerically simulated a granular pile and subjected it to repeated quakes : we managedto reproduce segregation. We studied the influence of physical and numerical parameterson the segregation level and the dynamics of the phenomenon. We also investigate variouscauses of the segregation : granular convection, kinetic sieving, depletion pressure, etc.Finally, we highlighted an azimuthal segregation which can explain observations duringspatial missions
Leturia, Mikel. "Étude hydrodynamique et modélisation des réacteurs de carbochloration." Thesis, Compiègne, 2013. http://www.theses.fr/2013COMP2097.
This thesis deals with the experimental study of gas-solid flows and the modeling of fluidized bed reactors. The industrial application investigated in this work corresponds to the carbochlorination of zirconium dioxide (ZrO2), which is an essential step for the production of zirconium metal. The main objective is to develop a model of the industrial reactors and provide a better understanding of their behavior. The approach consists first in studying the hydrodynamics of fluidized bed carbochlorination reactors. The results show that the carbon black acts as a flow conditioner (glidant) and improves the flow properties of the ZrO2/C mixture. The presence of tiny spherical carbon nanoparticles on the surface of relatively large oxide particles reduces the interparticle forces and friction between adjacent particles. A good dispersion of the carbon nanoparticles is needed to enhance their ability to act as a glidant and also increase the resistance to segregation of the resulting mixture. From the experimental data, different methods and correlations are developed to predict the agglomerate size and density, the minimum fluidization velocity, the bed expansion and the elutriation flow rate. Then, a carbochlorination reactor model is developed by coupling hydrodynamics and kinetics. This model allows the resolution of unsteady-state mass and energy balance equations as well as population balance equations. It is thus possible to predict the chlorine conversion, the composition of the product gas, the elutriation flow rate and the particle size distribution in the bed depending on the operating conditions
Тези доповідей конференцій з теми "Lit cohésif":
Mory, Mathieu, Ismael Piedra-Cueva, and Philippe Larroudé. "Érosion d'un lit déposé de sédiments cohésifs." In Journées Nationales Génie Côtier - Génie Civil. Editions Paralia, 1998. http://dx.doi.org/10.5150/jngcgc.1998.010-m.