Letteratura scientifica selezionata sul tema "Surfaces évolutives"
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Articoli di riviste sul tema "Surfaces évolutives":
LIENARD, G., M. LHERM e D. BEBIN. "Les exploitations d’élevage bovin allaitant en zones défavorisées : évolution, questions. Analyse à partir d’un échantillon d’exploitations charolaises de grande dimension". INRAE Productions Animales 9, n. 4 (17 agosto 1996): 285–97. http://dx.doi.org/10.20870/productions-animales.1996.9.4.4062.
LIENARD, G., M. LHERM e D. BEBIN. "Les exploitations d’élevage bovin allaitant en zones défavorisées : évolution, questions. Analyse à partir d’un échantillon d’exploitations charolaises de grande dimension". INRAE Productions Animales 9, n. 4 (20 agosto 1996): 285–97. http://dx.doi.org/10.20870/productions-animales.1996.9.4.4069.
Deler, Jean-Paul. "L’atelier, un objet métropolitain révélateur des évolutions urbaines". L’Espace géographique Tome 49, n. 2 (20 gennaio 2021): I. http://dx.doi.org/10.3917/eg.492.0189a.
Steiger, Johannes, Lucas Mazal e Irène Till-Bottraud. "Relier la biogéomorphologie fluviale à l’écologie évolutive : un focus sur les arbres riverains pionniers". Géomorphologie : relief, processus, environnement 26, n. 1 (1 maggio 2020): 55–72. http://dx.doi.org/10.4000/geomorphologie.14127.
Belhamri, Azeddine, e Jean Paul Fohr. "Influence de l’Evolution de l’Etat de Surface sur la Modèlisation du Séchage de Milieux Poreux". Journal of Renewable Energies 1, n. 1 (30 giugno 1998): 29–35. http://dx.doi.org/10.54966/jreen.v1i1.941.
Cioldi, Fabrizio, Marco Conedera, Fulvio Giudici e Anne Herold. "Dynamique évolutive de la forêt au Sud des Alpes suisses". Schweizerische Zeitschrift fur Forstwesen 172, n. 5 (1 settembre 2021): 318–29. http://dx.doi.org/10.3188/szf.2021.0318.
JEZ, C., B. COUDURIER, M. CRESSENT, F. MÉA e P. PERRIER-CORNET. "Prospective de la filière équine française à l’horizon 2030. Quatre scénarios contrastés pour éclairer la décision". INRAE Productions Animales 26, n. 1 (16 marzo 2013): 51–64. http://dx.doi.org/10.20870/productions-animales.2013.26.1.3136.
MARTIN, B., M. LHERM e C. BÉRANGER. "Évolutions et perspectives de l’élevage des ruminants dans les montagnes françaises". INRAE Productions Animales 27, n. 1 (2 aprile 2014): 5–16. http://dx.doi.org/10.20870/productions-animales.2014.27.1.3050.
Morgado, Sofia. "Protagonisme de l'absence : interprétation urbanistique de la formation métropolitaine de Lisbonne à partir des espaces non bâtis. Note de recherche". Sud-Ouest européen 24, n. 1 (2007): 125–28. http://dx.doi.org/10.3406/rgpso.2007.2958.
De Seze, M., G. De Korvin e E. Cugy. "Détection des scolioses radiologiquement évolutives par la topographie de surface numérisée (Biomod-L®) : étude prospective sur 100 patients". Annals of Physical and Rehabilitation Medicine 57 (maggio 2014): e135-e136. http://dx.doi.org/10.1016/j.rehab.2014.03.486.
Tesi sul tema "Surfaces évolutives":
Lopez, David. "Diagrammes de Voronoï et surfaces évolutives". Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0247.
In this paper, we propose to address the problem of tracking a deformable surface, typically the free surface of a liquid. This surface domain sees its geometry and topology evolve over time by displacement of its vertices, so the elements of the mesh (edges and facets) are all potentially contracted or expanded and require a remeshing. To do so, we propose to use a technique based on restricted Voronoi diagrams. Voronoi diagrams offer a space partition and, more particularly, a partition of the surface domain considered that allow us, among other things, to optimize the distribution of a sample set among the domain and to define a specific triangulation : the restricted Delaunay triangulation.This remeshing solution is only effective when certain conditions are met. Therefore, the first work consisted in implementing an analysis of the restricted cell configurations to ensure that the dual object meets the definition of triangulated manifold and that it is homeomorphic to the initial domain. For less favourable configurations, we have developed a method to correct the partition automatically. Based on the previous analysis, the method proposes a new minimal approximation for each of the faulty cells, thus we can limit the number of vertices used, contrary to the classical Delaunay refinement.A second work proposes to improve the proximity between the initial mesh and the result of the remeshing : new vertex positions are finely adjusted to minimize the approximation error which is here expressed as local volume differences.These tools are combined with a sampling strategy that allows to maintain a constant sampling density throughout the deformation and thus we propose a new method to track free surfaces in incompressible fluid simulation
Borocco, Marine. "Évolutions du film lubrifiant dans des seringues médicales". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLX032.
This PhD thesis is motivated by a practical problem encountered by Sanofi researchers when testing new autoinjector syringes: during injection of the pharmaceutical product, the plunger sometimes stalls before reaching the end of the syringe barrel, due to the high friction of the plunger stopper on the inner wall of the syringe. We aim to understand what causes this increase of the friction force; to do so, we take a closer look at the lubricating silicone oil layer covering the inner wall. Its average thickness profile (as a function of the distance along the axis of the syringe) is parabolic: during its storage, the oil layer underwent gravitational drainage.We also develop a related study: that of a fully wetting liquid finger flowing down a glass incline. Two different cases are explored: in the first one, the finger originates from an elongating drop of constant volume, while in the second one, it is fed by a constant influx of liquid. In both cases, we propose scaling law models that explain the evolution of the finger.Then, we explore the competition between silicone oil and aqueous solution to wet a glass substrate. We discuss the notion of differential wetting and study two experiments that would allow to measure the contact angle between water, oil and glass. These experiments showcase the increase in “siliconophilicity” as the time spent by the glass in contact with oil increases.We use these results in the case of autoinjector syringes. The silicone oil layer is observed as a function of time after the syringe is filled with water or drug: it dewets into droplets. We offer models explaining the phenomena happening inside syringes. The results lead us to a better understanding of some defaults of the autoinjector syringes; which allows us to propose ways to counter these defects
Bataille, Camille. "Topographie multi-échelle et fuite évolutive d'un contact coulissant : approche expérimentale et simulation". Thesis, Valenciennes, Université Polytechnique Hauts-de-France, 2020. http://www.theses.fr/2020UPHF0008.
Pumps allow the transfer of a product (glue, lubricant, petrol, etc.) to the pressurised spraying system. Being present in a multitude of industries, their reliability is of major importance for the protection of the environment and health. We study the impact of surface finish on the functionality (tightness, wear) of different systems, within pumps and spraying systems. A multi-scale characterization method is thus implemented in order to understand the impact of the surface finish of parts on the functionality of these systems. This method is applied on a first characterization study of the tightness of reversible nozzles. It is not always easy to interpret the impact of the morphology of a surface on its functionality using roughness parameters. A contact model and a contact distribution visualization tool are therefore developed. The contact interface is thus computed to better understand the contact distribution and leakage paths. The next part of the thesis aims to characterize the seal/wear torque of a hydraulic piston. A test bench is developed to characterize the wear, tightness and topography of the studied parts. Thus, the degradation of the surface state of a piston is analyzed as a function of its tightness. In order to apply the study of the seal/wear coupling to other similar contacts, a numerical model, capable of calculating the hydraulic conductance of a sliding contact between two rough surfaces, is being developed. Finally, coatings that could replace hard chromium are being tested for wear. The use of hard chromium plating is highly regulated and will be banned in the future. Thus, the comparative degradation of different coatings under the same wear conditions is being studied
Ceausescu-Ersen, Elena Alina. "Application de la technique d'émission acoustique à la caractérisation de matériaux céramiques évolutifs". Limoges, 2004. http://aurore.unilim.fr/theses/nxfile/default/f8093c9b-c946-42b9-b46b-605c5f162195/blobholder:0/2004LIMO0029.pdf.
The acoustic emission is a non-destructive characterization technique usually applied for to monitoring the damage of materials submitted to mechanical stress. This thesis work presents the application of this technique to the study of evolving systems, in the absence of any external mechanic tension. The report begins with the presentation of this technique as well as its applications listed in the literature. The first results concern the monitoring of the calcium aluminate cement hydration phenomenon during the first hours (early age). The phenomena of growth and friction between the aluminium and calcium hydrates lead to a considerable acoustic activity. In the second time, we present the hydration of gypsum alone or in the presence of a retarding additive, which can be adsorbed at the surface of gypsum. We show that this technique is very sensitive to the surface adsorption phenomenon. Lastly, the report ends with the presentation of the studies on water adsorption or drying phenomena in a porous ceramic to which the acoustic emission is also sensitive
Brasse, Coralie. "Les aérosols organiques de Titan : leurs propriétés physico-chimiques et leurs possibles évolutions chimiques à la surface". Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1084/document.
Titan, the largest moon of Saturn, is one of the key planetary objects in the exobiology field. Its dense, nitrogen-rich atmosphere is the site of intense organic chemistry. This PhD work focuses on the organic aerosols which are produced in Titan's atmosphere. They play an important role in atmospheric and surface processes but also in its organic chemistry of exobiology interest. At first, in order to produce reliable laboratory analogs (“tholins”) of these aerosols, a device for the synthesis of clean tholins has been developed, tested and optimized. Then two complementary aspects of Titan aerosols have been studied :- Their optical properties. Indeed, their knowledge is prime importance to analyze and to better interpret many of Titan's observational data. A detailed and critical review of all available data on refractive indices was conducted. The lacks in this field have been highlighted. In parallel, direct experimental measurements were used to determine the scattering matrix at two wavelengths and for a wide range of scattering angles. The obtained results show that the tholins do not have the shape of aggregates such as Titan aerosols although the acquired data seem to match with observational data.- Their potential chemical evolution at Titan surface, in particular, the possible interaction between aerosols and putative ammonia-water cryomagma. Modelings of Titan formation have recently permitted the characterization of a composition in salts of the subsurface ocean and the cryolave. From this new and original chemical composition, a laboratory study of several hydrolyses of tholins has been carried out. The obtained results show the formation of many organic compounds, among them, species identified only in the presence of salts. In addition, a list of potential precursors of these compounds has been established
Bourahima, Fazati. "Évolutions microstructurales et défauts générés par laser cladding lors du dépôt de Ni sur des moules de verrerie en alliage de Cu-Ni-Al et en fonte GL". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS017/document.
In glass industry, the laser cladding is an innovative surfacing technique allowing to deposit a very thin layer of nickel to protect glass mold (useful for glass bottle production) against corrosion, abrasion and thermal fatigue. This method (powder fusion by projection) is well known in additive manufacturing. The aim of this work is to observe the impact of the laser cladding on the coating behavior but also on the Cu-Ni-Al and flake-graphite cast iron substrates. The microstructure and the mechanical properties were studied (SEM and microanalysis, microhardness, residual stress …) around the interface cladding/substrate. The work was also focused on the defects like lack of bonding but also on cracking behavior during surfacing on cast iron. The purpose was to prevent from those defects. This work showed that the lack of bonding to the Cu-Ni-Al substrate is due to the gaussian distribution of the powder which attenuates the input laser power at its peak. The lack of bonding is not detected on cast iron substrate thanks to its high absorptivity and low thermal conductivity. Nevertheless, cracks can be observed due to thermal residual stresses and the presence of a thermal affected zone. The ANOVA technique allowed us to optimize the processing parameters in order to obtain a perfect bonding and the geometry wanted by CHPOLANSKY Establishments
Scheidt, Céline. "Analyse statistique d'expériences simulées : Modélisation adaptative de réponses non régulières par krigeage et plans d'expériences, Application à la quantification des incertitudes en ingénierie des réservoirs pétroliers". Phd thesis, Université Louis Pasteur (Strasbourg) (1971-2008), 2006. https://publication-theses.unistra.fr/public/theses_doctorat/2006/SCHEIDT_Celine_2006.pdf.
Quantification of uncertainty in reservoir performance is an essential phase of oil field evaluation and production. Due to the large number of parameters and the physical complexity of the reservoir, fluid flow models can be computationally time consuming. Traditional uncertainty management is thus routinely performed using proxy models of the fluid flow simulator, following experimental design methodology. However, this approach often ignores the irregularity of the response. The objective of the thesis is to construct non-linear proxy models of the fluid flow simulator. Contrary to classical experimental designs which assume a polynomial behavior of the response, we build evolutive experimental designs to fit gradually the potentially non-linear shape of uncertainty. This methodology combines the advantages of experimental design with geostatistical methods. Starting from an initial trend of the uncertainty, the method determines iteratively new simulations that might bring crucial information to update the estimation of the uncertainty. Four criteria of adding new simulations are proposed. We suggest performing simulation at the extremes and the null derivative points of the approximation in order to better characterize irregularity. In addition, we propose an original way to increase the prior predictivity of the approximation using pilot points. The pilot points are also good candidates for simulation. This methodology allows for an efficient modeling of highly non-linear responses, while reducing the number of simulations compared to latin hypercubes. This work can potentially improve the efficiency in decision making under uncertainty
Libri sul tema "Surfaces évolutives":
Marty. La pratique de la commande numérique des machines-outils: Programmation, domaines d'application, génération de surfaces évolutives, retour d'investissement, intégration. Lavoisier, 1999.
Capitoli di libri sul tema "Surfaces évolutives":
Blanc, Jean-Joseph. "Importance géodynamique des surfaces d’aplanissement en Provence". In Karsts et évolutions climatiques, 191–207. Presses Universitaires de Bordeaux, 1992. http://dx.doi.org/10.4000/books.pub.10904.
GIORGI, Marie-Laurence, e Jean-Michel MATAIGNE. "Aciers à haute résistance et revêtements". In Le développement des aciers à très haute résistance, 137–68. ISTE Group, 2022. http://dx.doi.org/10.51926/iste.9122.ch5.
FAILLE, Arnaud. "Faune souterraine et biogéographie". In La biogéographie, 159–80. ISTE Group, 2022. http://dx.doi.org/10.51926/iste.9060.ch6.
Atti di convegni sul tema "Surfaces évolutives":
Taglione, Matthieu, e Clément Skopinsky. "CND et aspect de surface : pratiques industrielles et évolutions du contrôle visuel". In Etats de surface dans les réacteurs nucléaires : enjeux, avancées et perspectives. Les Ulis, France: EDP Sciences, 2017. http://dx.doi.org/10.1051/jtsfen/2017eta03.