Tesis sobre el tema "Forme limite"
Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros
Consulte los 50 mejores tesis para su investigación sobre el tema "Forme limite".
Junto a cada fuente en la lista de referencias hay un botón "Agregar a la bibliografía". Pulsa este botón, y generaremos automáticamente la referencia bibliográfica para la obra elegida en el estilo de cita que necesites: APA, MLA, Harvard, Vancouver, Chicago, etc.
También puede descargar el texto completo de la publicación académica en formato pdf y leer en línea su resumen siempre que esté disponible en los metadatos.
Explore tesis sobre una amplia variedad de disciplinas y organice su bibliografía correctamente.
Dini, Alessandra y Claudia Casadio. "Forma della città e forme dell'abitare. Giardino botanico a Mirandola". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6894/.
Texto completoAntonini, Daniela y Francesca Baldazzi. "Forma della città e forme dell'abitare. Centro culturale a Mirandola". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6890/.
Texto completoHauw, Benoît. "Comportement volumique des revêtements en mise en forme à froid : concept de courbe limite de détérioration". Valenciennes, 1999. https://ged.uphf.fr/nuxeo/site/esupversions/2fbdba67-5dfc-4b43-9739-4fd2ed08ee94.
Texto completoKacem, Ahmed. "Étude de la capacité limite de déformation dans les procédés de mise en forme par déformation locale". Lorient, 2013. http://www.theses.fr/2013LORIS288.
Texto completoThis thesis deals with the experimental and numerical investigations of the limits of the flanging process arising from material failure. The methodology developed in this study was applied particularly to the stretch flanging process of a hole in sheet metal called the hole-flanging process. The materials studied are made of A1050-H14 and A6061-O aluminium alloys. Mechanical characterizations have been performed through uniaxial tensile and shear tests. An elasticplastic finite element models based on isotropic and anisotropic yield criteria were developed. These models were enhanced by the integration of the damage in simulation. Experiments were conducted to verify the reliability of the developed finite element models. First, the effect of the clearance thickness ratio on the hole-flanging process was studied. A methodology was made to distinguish two conditions of the process: hole-flanging with and without ironing. Then, the effect of material anisotropy assumptions on the predictive accuracy of finite element simulations of the hole-flanging process was quantified. The study was then focused on the determination of the limits of hole-flanging process arising from material failure. For that purpose, a fracture criterion was calibrated and used in simulations to predict the damage of the flange. Finally, the damage occurrence in flanged edge was characterized by using the coupled approach of Gurson-Tvergaard-Needleman
Lavertu, Karine. "Limite de l'hypothèse quasi stationnaire dans le phénomène de galop étudié sur une section en D". Thèse, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/8174.
Texto completoDudzinski, Daniel. "Application du modèle d'écrouissage cinématique à la mise en forme : influence de la température sur limite de formage". Metz, 1986. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1986/Dudzinski.Daniel.SMZ8619.pdf.
Texto completoA great number of parameter may influence the formability of sheets. Among the most important are the strain-hardening, the strain rate sensitivity, damage, initial and induced anisotropy. For some materials with low thermal conductivity or high rate conditions, thermal effects are not negligible. Influence of such effects on formability has received little attention. In the first part of this work, we are concerned in anisotropic induced hardening. We use a formulation of kinematic hardening with memory effect. This formulation leads to a VOCE-type stress-strain law. So the powedr law with constant strain hardening coefficient may not be the best description of materials like brass or stainless steel that seem to exhibit a VOCE stress-strain law. The effect of the objective derivative used in the kinematic hardening model is discussed. Two objective derivatives are tested leading to different behavior in simple shear. We study the influence of this behavior on the forming limit diagrams and compare with experimental results. We are also interested in the influence of strain rate sensitivity and thermomechanical coupling on formability. Finally, we consider a material which the shear stress depends upon temperature, strain, strain rate through a power law. Shear localization is studied and combined influence of strain rate sensitivity, strain hardening and thermal softening in formability is discussed
Dudzinsky, Daniel. "Application du modèle d'écrouissage cinématique à la mise en forme, influence de la température sur la limite de formage". Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb375973190.
Texto completoDudzinski, Daniel Molinari Alain. "APPLICATION DU MODELE D'ECROUISSAGE CINEMATIQUE A LA MISE EN FORME : INFLUENCE DE LA TEMPERATURE SUR LA LIMITE DE FORMAGE /". [S.l.] : [s.n.], 1986. ftp://ftp.scd.univ-metz.fr/pub/Theses/1986/Dudzinski.Daniel.SMZ8619.pdf.
Texto completoMadou, Komlanvi. "Contribution à l'étude des effets de forme des cavités en rupture ductile des métaux". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00833021.
Texto completoMadou, Komlanvi. "Contribution à l'étude des effets de forme des cavités en rupture ductile des métaux". Phd thesis, Paris 6, 2012. http://www.theses.fr/2012PA066245.
Texto completoDuctile fracture of materials occurs by nucleation, growth and coalescence of microvoids. The most classical model describing the voids growth in plastic porous materials is introduced by Gurson. This model was derived from limit-analysis of a hollow sphere subjected to conditions of homogeneous boundary strain rate. Gurson’s model was extended to spheroidal, both prolate and oblate voids by Gologanu et al. In this work, we further extend Gologanu et al’s model to general ellipsoidal voids. In a first step, the velocity field satisfying conditions of homogenous strain rate on all ellipsoids confocal with the void and the outer boundary, discovered by Leblond and Gologanu, is used in a limit-analysis of an ellipsoidal domain. A Gurson-like approximate yield function is obtained. In a second step, the preceding limit-analysis is improved: (i) For hydrostatic loadings, by performing micromechanical finite element computations in a number of significant cases; (ii) For deviatoric loadings, by directly using some general rigorous results for nonlinear composites. In a third step, the yield function proposed is validated versus a number of numerical computations of yield surfaces of hollow cells of various ellipsoidal shapes. In a fourth step, suitable evolution equations for the shape and orientation of the voids in plastic material are defined. The last step is devoted to the implementation of the Hill’s criterion in SYSTUS software and makes it possible to consider the extension of the model to plastic anisotropic materials
Neukirch, Sebastien. "Les attracteurs des systèmes dynamiques dissipatifs de Lorenz et de Liénard : nombre, forme et localisation". Phd thesis, Université Pierre et Marie Curie - Paris VI, 1998. http://tel.archives-ouvertes.fr/tel-00005184.
Texto completoOukaci, Farid. "Quelques problèmes numériques d'identification de forme en diffraction acoustique". Compiègne, 1999. http://www.theses.fr/1999COMP1206.
Texto completoDongmo, Wamba Mathurin. "Tomographie de l'Océan Indien par inversion de forme d'onde". Thesis, Université de Paris (2019-....), 2020. http://www.theses.fr/2020UNIP7077.
Texto completoThe arrival of some plumes and the birth of hotspots at the Earth surface is more likely the cause of the break up of the Pangea ~200 Ma ago, during the jurassic era. The Gondwana was formed by many continental masses like Africa, Australia, India and Antarctic. The late cretaceous was affected by a biological crisis caused by a volcanic and/or asteroid cataclysm which provoke the disappearance of 90% of life on the Earth including dinosaurs, and produced India Deccan trapps with an area of 2 millions km^2 and thickness of 2.5-3 km. This volcanic disaster was associated with the birth of la Réunion hotspot ~65 Ma years ago, from there the india plate entered into the northward migration with a velocity of about 18-20 cm/year, and the closure of the Tethys ocean in front of the indian plate started; in the meantime the raising of basaltic lava from the indian ridges formed a new ocean floor behind the indian plate: this was the birth of indian ocean. In 1953 the Canadian researcher Tuzo Wilson suggested that such an intra-plate volcano may be due to a fixed hotspot in the mantle capable to create successive volcano on the surface; later in 1971 Jason Morgan suggested that the hotspot is fed by a mantle plume rising from the core-mantle boundary due to thermal instabilies. The goal of this thesis is to investigate the actual state of the plume in the entire indian ocean, responsible of many volcanic islands such as Maldives, Maurice and Réunion. By applying waveform inversion we are able to image the earth structure down to the lower mantle; we use Rhum-Rum data and also data collected from FDSN (Federation of Digital Seismograph Networks) data center to perfom our inversion. We perform the forward modelling with the spectral element method. For this regional case we use RegSEM (regional spectral element method) to compute synthetic seismograms that were compared to real seismograms later on. We divided the waveform into several wavepackets, each wavepacket corresponds to a specific mode. We inverted for two parameters, isotropic velocity and radial anisotropy.The result shows a large velocity anomaly channel extending from East to West over nearly ~2100 km in the Mascarene basin at a depth of 200 km. Our model also bring to light a plume under the Reunion hotspot with a broad head in the upper mantle and a narrow tail anchored in the lower mantle. Our model sheds light on the connection between the Reunion plume and the South African LLSVP (Large Low Shear Velocity Province), as well as between the Mascarene anomaly and the base of the lower mantle
Kuchumov, Nikolai. "Formes limites pour le modèle de dimères dans des domaines non simplement connexes". Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS281.
Texto completoThis thesis consists of three parts, the goal of the first part is to study random domino tilings of a multiply-connected domain with a height function defined on the universal covering space of the domain. We establish a large deviation principle for the height function in two asymptotic regimes. The first regime covers all domino tilings of the domain. A law of large numbers for height change in this regime will also be derived. The second regime covers domino tilings with a given asymptotic height change.The second part of thesis is an extension of the first part. We prove the existence of a limit shape for the dimer model on planar periodic bipartite graphs with an arbitrary fundamental domain and arbitrary periodic weights.The third part is devoted to computation of the arctic curve of the multiply-connected Aztec diamond in two regimes. The first regime, called an unconstrained case, corresponds to the uniform measure on a set of domino tilings. The second regime, constrained case, puts a condition on the height change of domino tilings
Mokni, Hichem. "Prolongement d'applications linéaires, espaces des fractions et problème des moments". Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10101/document.
Texto completoLn this work we are interested by extending Iinear forms and Iinear maps in general on inductive Iimit spaces of locally convex spaces or of sorne operator algebras. Firstly, we consider the more general case i.e. extending linear forms on limit spaces of locally convex spaces. We give a necessary condition on the linear forms making the extension possible. We are also in interest of a norm preserving extension. We show by an example that a such extension is no always possible then we state our result in a general case. Moreover we give an application of our main result in a context of germes of holomorphic fonctions on a compact set of Cn. After that, we generalize this results and the application, by the same way, when the Iinear application are with operator values. Secondly, we consider the same questions in a particular case of inductive limits : The spaces of fractions. We generalize the result of F-H. Vasilescu in a non commutatif context and then we generalize the multi-dimensionnels moment problem on a closed unbounded set of quaternion set. Finally, we focus on the completely positive or completely contractive linear maps on spaces of fractions with operator values. We consider the non commutative context of the work of E. Albrecht and F-H. Vasilescu. As an application, we generalize the given moment problem on the operator case and we give a new measure. Then we give a characterization of the moment maps
Fermín, Lisandro. "Agrégation de processus stochastiques, désagrégation et longue mémoire". Paris 11, 2008. http://www.theses.fr/2008PA112120.
Texto completoThis thesis is devoted to three closely related problems. The first one is the aggregation of doubly stochastic processes. The second one is about obtaining a long memory processes through the aggregation of short memory processes. The third one is the inverse problem of aggregation, which we shall call disaggregation. We star by studying the aggregation of doubly stochastic linear processes with interactive innovations and we develop a novel SLLN for random quadratic forms of U-statistic which implies the a. S. Convergence of the covariance function of the partial aggregation process. Then, we extend the aggregation convergence results for some doubly stochastic nonlinear processes considering common innovations and weakly dependent innovations. In this last setting we introduce a new weak dependence notion for doubly stochastic processes and we exhibit several models satisfying this notion. In a second part we study the aggregation and the disaggregation of autoregressive processes. Mixture of spectral densities with random poles is the main tool. This tool is useful to build long memory processes by aggregation. Finally, we study the disaggregation on the class of short memory processes whose spectral densities are infinitely differentiable. We prove that a large set of long memory processes are obtained by an aggregation procedure involving these processes
Chottin, Jérôme. "Etude de l'endommagement des aciers Dual Phase : application au procédé de mise en forme par cambrage". Caen, 2011. http://www.theses.fr/2011CAEN2069.
Texto completoThe damage mechanisms activated by forming processes with high level of deformation are studied in Dual Phase steels (DP1000). The main objective is to describe and quantify the evolution of the void area fraction depending on stress state. This description is meant to allow the anticipation of the material failure during bending. For this reason, mechanical tests are being conducted on samples with complex geometries, in parallel with finite element analysis. By the means of simple tools, these tests allow us to apply solicitations on the material within a determined range of stress states, including most of the forming processes. The microstructural examination of the specimens reveals the creation of cavities at the ferrite/martensite interfaces after the deformation process, as well as a high sensitivity of initiation, growth and coalescence mechanisms in the stress state. These results are used to calibrate the modified Gurson model (GTN) and the Johnson-Cook fracture criterion. In addition to this, nanoindentation cartographies are created to describe the properties of the interfaces during the deformation process. These tests highlight the differences in plastification between the two phases and the heterogeneous hardening in ferrite due to the local stress distributions. Thus, this study deals in wider terms with the definition of damage in materials as well as the differences between macroscopic and microscopic stress states
Callot, Pierre. "La Formation Ayabacas (limite Turonien-Coniacien, Sud-Pérou) : collapse sous-marin en réponse à l'amorce de l'orogenèse andine". Phd thesis, Université Paul Sabatier - Toulouse III, 2008. http://tel.archives-ouvertes.fr/tel-00305704.
Texto completoLe collapse s'organise du NE au SW en six zones basées sur les faciès de déformation, en relation avec deux importants systèmes structuraux d'échelle lithosphérique (une septième zone, à l'extrême NE, correspondant aux dépôts non déstabilisés). Dans les parties amont du collapse (zones 1 à 3, au NE), les dépôts forment une méga-brèche, avec des éléments de taille décamétrique à kilométrique (principalement des nappes et des radeaux calcaires, souvent plissés plastiquement ; plus rarement des blocs rigides dérivés de formations crétacées et paléozoïques) flottant dans un mélange de petits clastes carbonatés ou siliciclastiques et de matériaux pélitiques rougeâtres. Ce mélange de matériaux enclins à se liquifier et à se déformer plastiquement a servi de semelle de glissement aux plus gros éléments. Ces zones se caractérisent également par des déformations et des faciès bréchiques quelle que soit l'échelle d'observation. Les parties aval, au SW, sont exclusivement carbonatées, avec un empilement de masses calcaires de tailles croissantes, une disparition de la semelle de glissement très ductile et une organisation croissante des dépôts marquant un amortissement du collapse.
Le collapse Ayabacas, qui s'est produit sur une marge qui paraissait a priori stable, est atypique comparé aux autres glissements actuels ou fossiles. Intervenant immédiatement avant la rapide continentalisation du bassin d'arrière-arc sud-péruvien, et donc l'émergence des Andes, le collapse est une des conséquences de changements géodynamiques à l'échelle de la cellule de convection mantellique du Pacifique, qui ont notamment entraîné une brusque modification des conditions de subduction dans le sud du Pérou. Ce bouleversement a provoqué une flexure de la lithosphère de l'arrière-arc et un découpage du substratum ante-Ayabacas en blocs basculés par des failles normales, créant des pentes favorables au collapse de la plate-forme.
Lefort, Apolline. "La limite oxfordien-Kimméridgien (jurassique supérieur) : stratigraphie et paléoenvironnements dans les royaumes téthysien (Est et Sud du Bassin de Paris, France) et boréal (ile de Skye, Ecosse)". Thesis, Nancy 1, 2011. http://www.theses.fr/2011NAN10006/document.
Texto completoIsotopic ([delta]18O and [delta]13C) and elementary geochemical data as well as macro and microfossil associations, show a chemical change in the water of the lagoonal platform in the eastern Paris Basin, during the Late Oxfordian/Early Kimmeridgian interval (Upper Jurassic, ~156 Ma). Gradually, the shallow tropical environments dominated by biomineralization of carbonates became confined, dysoxic and colder. Correlations between depositional environments with similar facies in the Southern and in the Eastern Paris Basin helped to improve the biostratigraphic frameworks. Comparisons between the sequential frames deduced from the palaeoenvironmental evolution of Berry and Lorraine places the maximum regression of a 3rd order cycle at the Planula and Platynota ammonite zones boundary. Recently, the Flodigarry Shale Member, a shaly succession located on the Isle of Skye (Scotland), has been proposed as a possible GSSP (Global Stratotype Section and Point) to define the Oxfordian/Kimmeridgian boundary. The section was studied in order to compare this subboreal series to submediterranean deposits (Paris Basin) by means of other markers such as organic molecular contents. It revealed very well preserved biomolecules, among the oldest identified in the world. This thesis provides new palaeontological, geochemical and stratigraphic data in both Jurassic palaeobiogeographic realms. Well documented sections of the Eastern Paris Basin are now available for this interval. Such local observations, integrated in a multidisciplinary approach, should strengthen the correlations across these realms and precise the global components of the crisis of the carbonate production near the O/K boundary
Lefort, Apolline. "La limite Oxfordien-Kimméridgien (Jurassique supérieur) : stratigraphie et paléoenvironnements dans les domaines téthysien (Est et Sud du bassin de Paris, France) et boréal (Ile de Skye, Ecosse)". Phd thesis, Université Henri Poincaré - Nancy I, 2011. http://tel.archives-ouvertes.fr/tel-00597516.
Texto completoPipard, Jean-Marc. "Modélisation du comportement élasto-viscoplastique des aciers multiphasés pour la simulation de leur mise en forme". Phd thesis, Paris, ENSAM, 2012. http://pastel.archives-ouvertes.fr/pastel-00668551.
Texto completoHassani, Salima. "Comportement limite de certains problèmes aux limites avec de grands et/ou petits paramètres". Valenciennes, 2011. http://ged.univ-valenciennes.fr/nuxeo/site/esupversions/df5eac34-095d-4baa-9a6d-aeb0014d9a39.
Texto completoTo our knowledge a systematic analysis of general systems of partial differential equations, where one parameter tends to infinity in a sub-domain that squeezes to a smooth hyper-surface of codimension 1 was not performed. In order to treat such problems, for a family of bilinear forms depending on two parameters delta and sigma, the first one being devoted to tend to zero and the second one to infinity, we give a general framework as large as possible allowing to characterize the limit problems obtained further to the passages in the limit. We show that these two passes the limit does not commute, except for particular cases, which are specified in the manuscript, and for which a necessary and sufficient condition guaranteeing the commutativity is deducted. The strong convergence results are also proved. To illustrate our analysis, we then apply this framework for different transmission problems (elliptic one) for the elasticity systems (anisotropic and general case too) and the anisotropic diffusion problems where one parameter tends to infinity and/or a part of the domain squeezes to a smooth surface. In some cases these limit procedures lead to new transmission problems, for example, a coupling between the Lamé system and the Stokes system. To finish, we were interested in the three-dimensional system of Maxwell (not elliptic). For this example only limit when s tends to infinity is possible. The difficulty for the limit when delta tends to zero comes owing to the fact that encased spaces are equipped with norms depended on parameter delta. In order to overcome this disadvantage, at least into the two-dimensional case, we transformed the problem by changing the scale in a singular perturbation problem for which we give an asymptotic analysis
Bouré, Philippe. "Lubrification et usure du contact fil/outil en tréfilage humide". Ecully, Ecole centrale de Lyon, 1999. http://www.theses.fr/1999ECDL0047.
Texto completoFor the past ten years, the use of high tensile steel and the productivity requirements have les respectively to an increase in pressure and speeds in the drawing process of steelcord. The control of both lubrication and wear of the wire/die contact is a key point for the process optimisation. This study deals with built-up of the interfacial lubricating film in this high pressure contact lubricated with an emulsion. The rheological behaviour and the wetting properties of the lubricant in the inlet zone of the wire/die contact are important parameters. The inlet zone, where the lubrication regime is elastohydrodynamic, governs the formation of the lubricating film and the lubricant supply of the contact. The knowledge of the lubricant behaviour in this inlet zone is crucial to understand the lubrication in the drawing process of steelcord. This has been experimentally investigated with an EHL tribometer and chemical analyses of the lubricant film. It has been shown that a change in the physical structure of the lubricant due to ageing is a necessary condition to build-up a lubricant film. A model based on the analysis of the starvation process has been developed to evaluate the rheaological properties of the lubricant film formed on the contacting bodies. The adherence and slippage at the wall of the lubricating film is explained by electrical interactions between the metallic surfaces and lubricant particles. Both formation and breakage of the lubricating film are connected with the industrial process. The wear of the drawing die is studied in details with an instrumented drawing machine especially developed for this purpose. This study demonstrates that the interactions between the transfert layers observed on the surface of the drawing dies and the lubrication process. In the first step of the process, the lubrication regime appears to be essentially plastohydrodynamic. As the running conditions become more and more severe in the last steps of the process, a boundary regime is reached. Finally, hypothesis based on the different observations pointed out in this study are proposed to explain the wear mechanisms
Kulkarni, Giridhar. "Étude asymptotique des facteurs de formes des chaînes de spin quantiques". Thesis, Bourgogne Franche-Comté, 2020. http://www.theses.fr/2020UBFCK043.
Texto completoSince a long-time, the quantum integrable systems have remained an area where modern mathematical methods have given an access to interesting results in the study of physical systems. The exact computations, both numerical and asymptotic, of the correlation function is one of the most important subject of the theory of the quantum integrable models. In this context an approach based on the calculation of form factors has been proved to be a more effective one. In this thesis, we develop a new method based on the algebraic Bethe ansatz is proposed for the computation of the form-factors in thermodynamic limit. It is applied to and described in the context of isotropic XXX Heisenberg chain, which is one of the example of an interesting case of critical models where the Fermi-zone is non-compact
Mazuyer, Denis. "La force de frottement limite". Ecully, Ecole centrale de Lyon, 1989. http://bibli.ec-lyon.fr/exl-doc/TH_T1344_dmazuyer.pdf.
Texto completoWittmann, Anja [Verfasser] y Sebastian [Akademischer Betreuer] Goette. "Eta-forms and adiabatic limits for fibrewise Dirac operators with varying kernel dimension = Eta-Formen und adiabatische Limiten für faserweise Dirac Operatoren mit variierender Kern-Dimension". Freiburg : Universität, 2016. http://d-nb.info/1122647476/34.
Texto completoMorger-Pradere, Sylvie. "Etats limites et force du moi : contribution à la caractérisation d'un outil d'évaluation de la force du moi dans les états-limites". Montpellier 1, 1996. http://www.theses.fr/1996MON11540.
Texto completoAguilar, Jean-Christophe. "Optimisation de formes hydrodynamiques : Couche limite intrinsèque tridimensionnelle". Paris, ENMP, 1996. http://www.theses.fr/1996ENMP0834.
Texto completoChantalat, Frédéric. "Méthodes level-set et de pénalisation pour l'optimisation et le contrôle d'écoulements". Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13828/document.
Texto completoThis work deals with e?cient numerical solving of problems linked with shape optimization or ?ow control. The combination between penalization, that allows to impose boundary conditions while avoiding the use of body-?tted grids, and Level-Set methods, which enable a natural non-parametric representation of the geometries to be optimized, is implemented. In the ?rst part, a model inverse problem, and an application pertaining to optimal design in Stokes ?ows, are treated with an iterative algorithm. Special care is devoted to the solution of the PDE’s in the vicinity of the penalized regions. The discretization accuracy is increased. Various gradient preconditionings aiming at improving the convergence are also discussed. The second part is dedicated to direct numerical simulation of ?ows in the neighborhood of an actuator, in the context of active control by pulsed jets used on the Ahmed body. The local study emphasizes the in?uence of various parameters on the action quality, in particular the pulsation frequency, or the aspect of exit velocity pro?les. As a synthesis, shape optimization is performed on the actuator of chapter two, thanks to the previously introduced coupling between Level-Set and penalization. The framework is simpli?ed and topological constraints are imposed. The inverse problem we set intends to modify the MEMS inner geometry to retrieve a given jet pro?le on the exit section
Silva, Beatriz Francalacci da. "Forma arquitetônico-urbana e desempenho ambiental : entre os limites e as possibilidades do adensamento construtivo". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/149288.
Texto completoThe study in microscale of the relationship between the architectural-urban form and the environment is the goal of this research. It starts with the hypothesis that there are more appropriate architectural-urban forms than those provided by the urban and construction legislation to achieve the best environmental performance, making possible to assess what are the most suitable compositions according to the local conditions. In this context, it is presented as a study object an urban area with high density built in Florianópolis-SC, which is the reference to analyze the environmental impact generated by the architectural-urban form and the result of their final performance. For this evaluation, it was considered the environmental factors associated with the heat, light and acoustic performance of urban and architectural space, as well as some features of the local environmental quality. The methodology uses quantitative and qualitative data obtained in loco and by the office work, through the following steps: 1. Exploratory (bibliographic, documentary and infographic research); 2. Experimental inductive (field measurements and structured interviews) and 3. Computational deductive (simulation of predictive models). The structure of the work demonstrates how the research object was understood and how can be developed studies in this subject, first presenting the environmental conditions (natural landscape and climate) and the architectural-urban form considered to further develop the association among the main themes - architecture and environment. The analysis considers the subjective perception of the author, from the observation of fragments of architecturalurban space, belonging to a whole. The work confirms the initial hypothesis, according as recommends architectural and urban design propositions for the case study, based on the environmental performance criteria. In addition, it stimulates discussion, interest and knowledge on the topic and confirms the urgent incorporation of environmental studies in the urban planning and in the architectural design proposals.
Texereau, Jacques. "Optimisation des silos en beton arme". Poitiers, 1987. http://www.theses.fr/1987POIT2279.
Texto completoBhargava, Rejeev. "The forms and limits of methodological individualism". Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253808.
Texto completoSimon, Bertrand. "Ordonnancement de graphes de tâches sur des plates-formes de calcul modernes". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEN022/document.
Texto completoThis thesis deals with three main themes linked to task graph scheduling on modern computing platforms. A graph of tasks is a classical model of a program to be executed, for instance a scientific application. The decomposition of an application into several tasks allows to exploit the potential parallelism of this application without adaptating the program to the computing platform. The graph describes the tasks as well as their dependences, some tasks cannot be initiated before others are completed. The execution of an application is then determined by a schedule of the graph, computed by a dedicated software, which in particular describes which resources should be allocated to each task at which time. The three studied themes are the following: exploit inner task parallelism, use accelerators such as GPUs, and cope with a limited memory.For some applications, two types of parallelism can be exploited: several tasks can be executed concurrently, and each task may be executed on several processors, which reduces its processing time. We propose and study two models allowing to describe this processing time acceleration, in order to efficiently exploit both types of parallelism.We then study how to efficiently use accelerators such as GPUs, in a dynamic context in which the future tasks to schedule are unknown. The main difficulty consists in deciding whether a task should be executed on one of the rare available accelerators or on one of the many classical processors. The last theme covered in this thesis deals with a available main memory of limited size, and the resort to expensive data transfers. We focused on two scenarios. If it is possible to avoid such transfers, we propose to modify the graph in order to guarantee that any execution fits in memory, which allows to dynamically schedule the graph at runtime. If every schedule needs transfers, we studied how to minimize their quantity.The work on these three themes has led to a better understanding of the underlying complexities. The proposed theoretical solutions will influence future software implementations
Coelho, Joana Candeias. "Um lugar extremo do Tejo". Master's thesis, Universidade de Lisboa, Faculdade de Arquitetura, 2020. http://hdl.handle.net/10400.5/20338.
Texto completoA reabilitação de preexistências é um tema cada vez mais presente na nossa sociedade, sobretudo onde o território é fortemente marcado por edifícios devoluto e espaços vancantes, o que merece um olhar mais atento. Com o pós-guerra foram diversas as estruturas militares que caíram em desuso e consequente abandono, resultando num vasto património histórico e artístico que deve ser alvo de projetos que os devolvam à cidade e à estima pública, resgatando-os da decadência em que se encontram. Perante esta questão, o presente trabalho incide sobre a necessidade de reutilizar o património militar devoluto, com um grande potencial para a regeneração urbana e para o desenvolvimento de novas centralidades. O principal foco é o território da Trafaria, que apesar da importância histórica e do património militar que alberga, enfrenta problemas de integração na cidade e de envelhecimento da população residente, fatores que levam ao seu isolamento e degradação urbana. Neste sentido, o projeto tem como finalidade a requalificação e consolidação da frente ribeirinha da Trafaria e a reabilitação do Forte da Trafaria através da inserção de novos usos, procurando atrair mais população para esta zona da cidade e potenciar o desenvolvimento sócio-económino local. Esta intervenção tem como fim a reintegração das estruturas militares na sua envolvente e na comunidade e, em simultanêamente, a valorização da memória e identidade do Forte Militar.
ABSTRACT:The rehabilitation of preexisting structures is an increasingly present theme in our society, especially where the territory is strongly characterized by vacant buildings and empty spaces that deserve a more attentive look. With the post-war context, many were the military structures that fell in disuse and, consequently, in abandonment, resulting in a large range of historical and artistic patrimony which should be targeted by projects that return it back to the city and public respect, rescuing it from the decay it currently they currently face. Taking this topic into account, the present work focuses in the necessity of reusing the vacant military heritage, that shows a big potential for the urban regeneration and for the development of new centralities. The main focus is Trafaria’s territory that, besides it’s historic significance and the military heritage it holds, faces integration problems towards the city and also the aging of the population it shelters, factors that lead to urban isolation and degradation. Thus, the project aims rhe requalification and consolidation of Trafaria’s riverfront and the rehabilitation of Trafaria’s Fort through the implementation of new uses, so as to attract new population to this part of the city, boosting the local socioeconomic development. This intervention aims the reintegration of the military structures in it’s surroundings and in the local community and, simultaneously, the military’s fort valorization and memory.
N/A
Brown, Austin (Austin R. ). "Axially force limited grinding spindle for robotic grinding". Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119966.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (page 35).
Grinding and Polishing of small parts is often easily performed by human hands, yet is challenging to automate. The grinding and polishing process is best done using a force-control scheme, which human hands perform naturally. Heavy robotic arms, which favor a position-control scheme, are difficult to control precisely, and trajectory errors can cause excessive grinding force which leads to burning of the part or destruction of the grinding wheel. Prior art of direct force control on a large robot arm requires the end-effector to have a 6-axis dynamometer, which is unwieldy, costly, and greatly limits the speed/precision of the process. We will discuss a new type of grinding spindle which is axially compliant, allowing the position-control robot arm to be used in a force-control nature. The spindle has a disjoint force-displacement curve, effectively operating in two modes: position-control mode at first, until a critical force is exceeded, when the spindle transitions into force-mode, keeping constant grinding force on the part though a certain range of travel. This limits the amount of force which can be imparted during grinding to a safe amount. The spindle is very simple and mechanically robust. We have built this hybrid position-force control spindle and tested it. The spindle was shown to perform correctly and successfully completed the test grind.
by Austin Brown.
S.B.
Morales, Patrícia Soares [UNESP]. "Limite de acoplamento forte da QCD e a interação méson-méson". Universidade Estadual Paulista (UNESP), 2002. http://hdl.handle.net/11449/91868.
Texto completoO mecanismo de rearranjo de tubos de fluxo predito no limite de acoplamento forte da formulação Hamiltoniana da QCD na rede foi implementado num modelo de quarks constituintes e suas consequências investigadas para o espalhamento méson-méson. O rearranjo de tubos de fluxo leva a efeitos similares aos tradicionais efeitos de troca de quarks com troca de um glúon em interações hádron-hádron. Contudo, enquanto o primeiro está relacionado ao regime de confinamento da QCD, o último está relacionado ao regime de liberdade assintótica desta teoria. Mostra-se aqui que ambos mecanismos levam a resultados qualitativamente similares quando o potencial de rearranjo pode ser escrito como a soma de interações locais quark-quark, antiquark-antiquark e quark-antiquark. Para interações gerais, não locais e de longo alcance, o rearranjo de tubos de fluxo leva a resultados qualitativa e quantitativamente diferentes dos resultados de troca de quarks com troca de um glúon. As consequências disso para a fenomenologia das interações hádron-hádron são discutidas.
The mechanism of link rearrangement predicted in the strong coupling limit of Hamiltonian lattice QCD is implemented in a constituent quark model and its consequences for meson-meson scattering are investigated. Link rearrangement leads to effects similar to the traditional quark exchange with one gluon exchange in hadron-hadron interactions. However while the first is related to the confinement regime of QCD, the latter is related to the asymptotic freedom regime of this theory. It is shown here that both mechanisms lead to identical qualitative results when the rearrangement potential can be written as a sum of local quark-quark, antiqurk-antiquark e quark-antiquark. For general, long-range nonlocal interactions, link rearrangement leads to results qualitative and quantitatively different from those of quark exchange with one gluon exchange. The consequences of this for the phenomenology of hadron-hadron interactions are discussed.
Faria, Renato Oliveira de. "\"Assalto contra o limite\": forma danificada e história em Franz Kafka". Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/8/8144/tde-06112013-102856/.
Texto completoThis thesis reflects upon the fragmentary configuration of Franz Kafka´s production. It aims to show how, from the end of 1916, occurs an formal inflection in the Kafkaesque production due to a change in the way the writer conceives the \"damaged\" character of his writing.
Morales, P. S. (Patrícia Soares). "Limite de acoplamento forte da QCD e a interação méson-méson /". São Paulo, 2002. http://hdl.handle.net/11449/91868.
Texto completoBanca: Tobias Frederico
Banca: Sadhan Kumar Adhikari
Resumo: O mecanismo de rearranjo de tubos de fluxo predito no limite de acoplamento forte da formulação Hamiltoniana da QCD na rede foi implementado num modelo de quarks constituintes e suas consequências investigadas para o espalhamento méson-méson. O rearranjo de tubos de fluxo leva a efeitos similares aos tradicionais efeitos de troca de quarks com troca de um glúon em interações hádron-hádron. Contudo, enquanto o primeiro está relacionado ao regime de confinamento da QCD, o último está relacionado ao regime de liberdade assintótica desta teoria. Mostra-se aqui que ambos mecanismos levam a resultados qualitativamente similares quando o potencial de rearranjo pode ser escrito como a soma de interações locais quark-quark, antiquark-antiquark e quark-antiquark. Para interações gerais, não locais e de longo alcance, o rearranjo de tubos de fluxo leva a resultados qualitativa e quantitativamente diferentes dos resultados de troca de quarks com troca de um glúon. As consequências disso para a fenomenologia das interações hádron-hádron são discutidas.
Abstract: The mechanism of link rearrangement predicted in the strong coupling limit of Hamiltonian lattice QCD is implemented in a constituent quark model and its consequences for meson-meson scattering are investigated. Link rearrangement leads to effects similar to the traditional quark exchange with one gluon exchange in hadron-hadron interactions. However while the first is related to the confinement regime of QCD, the latter is related to the asymptotic freedom regime of this theory. It is shown here that both mechanisms lead to identical qualitative results when the rearrangement potential can be written as a sum of local quark-quark, antiqurk-antiquark e quark-antiquark. For general, long-range nonlocal interactions, link rearrangement leads to results qualitative and quantitatively different from those of quark exchange with one gluon exchange. The consequences of this for the phenomenology of hadron-hadron interactions are discussed.
Mestre
Collini, Paul. "Réponse d'une couche limite à des ondes acoustiques de forte intensité". Aix-Marseille 2, 1990. http://www.theses.fr/1990AIX22051.
Texto completoDias, Luis Marçal Roriz. "Mídia e ideologia: limites e aspectos na forma política". Universidade Presbiteriana Mackenzie, 2016. http://tede.mackenzie.br/jspui/handle/tede/1176.
Texto completoThis work unfolds in three stages. The first addresses the relationship between the mode of production and therefore of socialization of individuals in this moment of contemporary capitalism with the concepts of Ideology, Ideological State Apparatuses (IEA), and the impacts that cause in individuals and their relationships. The second part focuses on how the media (one of IEA), particularly the means of communication, affects the social reality and the interaction of these individuals with this social environment, specifically in what concern our representative democracy. Finally, the third stage, more empirical, will be studied the media reality of Brazil, the concentration of power that occurs in a means of social communication, broadcasting service, specifically the issue of broadcast TV concessions, and the way that gives the exploitation of this public good by oligopolies.
O presente trabalho se desdobra em três etapas. A primeira aborda a relação existente entre o modo de produção e portanto de sociabilização dos indivíduos no presente momento do capitalismo contemporâneo com os conceitos de Ideologia, Aparelhos Ideológicos de Estado (AIE), e os impactos que causam nos indivíduos e em suas relações. A segunda parte se debruça sobre como a Mídia (um dos AIE), particularmente os meios de comunicação, afeta a realidade social e a interação desses indivíduos com esse meio social, especificamente na maneira que se dá a Democracia Representativa do Estado de Direito. Por fim, na terceira etapa, de caráter mais empírico, estudar-se-á a realidade midiática do Brasil, a concentração de poder que ocorre em um meio de comunicação social, o serviço de radiodifusão, especificamente a questão das concessões de TV aberta, e a forma que se dá a exploração desse bem público por oligopólios.
Varaška, Mantas. "The problem of term limits of the head of state in various forms of government: comparative aspect". Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120328_105219-95780.
Texto completoDisertacijoje atskleistas valstybės vadovo įgaliojimų trukmės aspektas ir jo sąsajos su Tautos suvereniteto, valdžių padalijimo, Konstitucijos viršenybės principais valstybės valdymo formose. Analizuojant valdžios ir valstybės vadovo įgaliojimų trukmės sampratą pasaulio teisinės minties raidoje, nustatytas jos mokslinio suvokimo progresas ir esminiai konstatuojamieji teiginiai (teisė nustatyti valdžios įgaliojimų trukmę priklauso tautai (J. Locke), valdžios įgaliojimų trukmė atvirkščiai proporcinga įgaliojimų dydžiui (Sh. Montesquieu). Tiriant valstybės vadovo įgaliojimų trukmės konstitucinio reguliavimo ypatumus ir dinamiką, išnagrinėtos ir apibendrintos daugiau nei 500 konstitucijų aktualios nuostatos, nustatytos jose užfiksuotų įgaliojimų trukmių apibrėžimų raidos tendencijos. Kitame tyrime nagrinėtos valstybės vadovo įgaliojimų trukmės konstitucinių nuostatų pažeidimų priežastys, dinamika monarchijos bei respublikos valdymo formose, atsižvelgiant į vadovų įgaliojimų apimties kriterijų. Remiantis tyrimų duomenimis, nustatytas Sh. Montesquieu teiginio (kuo valdžios įgaliojimai didesni, tuo trumpiau ji turi valdyti) tiesioginio ir atvirkštinio taikymo efektyvumas. Patvirtinta mokslinio tyrimo prielaida, jog valstybės vadovo įgaliojimų trukmės konstitucinių nuostatų pažeidžiamumas yra proporcingas jo įgaliojimų apimčiai. Šią konstitucinio reguliavimo problemą siūloma spręsti naudojant atvirkštinį Sh.Montesquieu teiginį (kuo valdžios įgaliojimai menkesni, tuo jų trukmė yra... [toliau žr. visą tekstą]
Péneau, Frédéric. "Etude numérique par simulation des grandes échelles de l'influence d'une forte turbulence extérieure sur les transferts pariétaux au sein d'une couche limite". Toulouse, INPT, 1999. http://www.theses.fr/1999INPT041H.
Texto completoGonthier, Yves. "Force task planning of robotic systems with limited actuator capabilities". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ29595.pdf.
Texto completoGonthier, Yves. "Force task planning of robotic systems with limited actuator capabilities". Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27222.
Texto completoTo improve the force capabilities of a system, base mobility or redundancy can be employed. A planning algorithm is proposed which results in proper base positioning relative to large-force quasi-static tasks. Similarly, the Force Workspace can be used to position such tasks relative to a robotic system. An efficient numerical algorithm is proposed to generate the Force Workspace, based on the 2$ sp{n}$-tree decomposition of the Cartesian space. Its efficiency stems from the variable resolution nature of the Cartesian space representation, and also from the use of four test levels that restrict the search to valid regions of the Cartesian space only. Examples of Force Workspaces are given for redundant and non-redundant planar manipulators, and spatial manipulators.
Next, the case of tasks requiring the application of a wrench along a given path is considered. The Task Workspace, the set of Cartesian space locations that are valid starting positions for such tasks, is shown to be a subset of the Force Workspace.
To plan redundant manipulator postures during large force-tasks, a new method based on a mini-max optimization scheme is developed. (Abstract shortened by UMI.)
Cunningham, Fiona S. (Fiona Stephanie). "Maximizing leverage : explaining China's strategic force postures in limited wars". Thesis, Massachusetts Institute of Technology, 2018. https://hdl.handle.net/1721.1/121602.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 420-444).
How do nuclear-armed states maximize strategic leverage to coerce their adversaries in limited wars? Although the existing literature has examined how states have used their nuclear weapons as sources of strategic leverage, it has not fully explored the challenges states face in using these extremely destructive weapons in limited wars. China's approach to maximizing strategic leverage offers one possible solution to these challenges. It has pledged not to use nuclear weapons unless it first suffers a nuclear attack from an adversary. Instead it threatens to use space, cyber and conventional missile weapons to maximize strategic leverage against an adversary in a limited war. I develop a theory of strategic substitution to explain why states might substitute space, cyber, and conventional missile weapons for nuclear weapons as sources of strategic leverage in limited wars and how they select force postures for each of these weapons.
First, I develop a typology of force postures for these non-nuclear strategic weapons based on how much they increase the risk of the state using its most destructive space, cyber or conventional missile weapons. Second, I outline two variables that determine whether a state pursues a non-nuclear strategic weapons capability and, if so, which force posture it selects. States pursue a coercive capability if they have a need for strategic leverage because they cannot respond to changes for the worse in their threat environment with credible threats to use nuclear weapons or their conventional military forces. States select postures by estimating the expected cost of an adversary's retaliation if they have to carry out a threat to use a non-strategic nuclear weapon. To demonstrate the explanatory power of the theory, I conduct comparative case studies of all seven Chinese decisions about its space, cyber and conventional missile postures since 1988.
Using original Chinese-language sources, I provide the most comprehensive account of China's post-Cold War strategic force posture choices in the existing literature. I show how China's nuclear posture, conventional military power, and its force postures for new military technologies are related, although they are often examined independently of one another in the existing literature.
by Fiona S. Cunningham.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Political Science
Rizzatto, Cleide Matheus [UNESP]. "A QCD no limite de acoplamento forte, a simetria quiral e a força nuclear". Universidade Estadual Paulista (UNESP), 2000. http://hdl.handle.net/11449/132844.
Texto completoRizzatto, Cleide Matheus. "A QCD no limite de acoplamento forte, a simetria quiral e a força nuclear /". São Paulo : [s.n.], 2000. http://hdl.handle.net/11449/132844.
Texto completoRabie, Ahmed Ibrahim El Said. "Nonlinear estimation of water network demands form limited measurement information". [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3132.
Texto completoGiobbi, Giuliana. "The limits, patterns and forms of the #Kunstlerroman' : a representative study". Thesis, University of Glasgow, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389903.
Texto completoCiavatti, Enrico. "Teorema del Limite Centrale e Legge del Logaritmo Iterato". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18248/.
Texto completo