Auswahl der wissenschaftlichen Literatur zum Thema „Systèmes de spins artificiels“
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Zeitschriftenartikel zum Thema "Systèmes de spins artificiels"
Samuel, Didier. „Les systèmes de support hépatique artificiels“. BioDrugs 8, Supplement 1 (1997): 26–28. http://dx.doi.org/10.2165/00063030-199700081-00011.
Der volle Inhalt der QuelleHughes, Thomas P. „L'histoire comme systèmes en évolution“. Annales. Histoire, Sciences Sociales 53, Nr. 4-5 (Oktober 1998): 839–57. http://dx.doi.org/10.3406/ahess.1998.279702.
Der volle Inhalt der QuelleLenay, Charles. „Organisation émergente dans les populations : biologie, éthologie, systèmes artificiels“. Intellectica. Revue de l'Association pour la Recherche Cognitive 19, Nr. 2 (1994): 9–17. http://dx.doi.org/10.3406/intel.1994.1459.
Der volle Inhalt der QuelleDonnadieu, Gérard. „Au fil de la Revue Internationale de Systémique : Les concepts de la systémique appliqués à la gestion des crises“. Acta Europeana Systemica 8 (10.07.2020): 139–46. http://dx.doi.org/10.14428/aes.v8i1.56323.
Der volle Inhalt der QuelleMolcrette, Bastien, Léa Chazot-Franguiadakis, Thomas Auger und Fabien Montel. „Quelques éléments de physique autour des nanopores biologiques“. Reflets de la physique, Nr. 75 (April 2023): 18–23. http://dx.doi.org/10.1051/refdp/202375018.
Der volle Inhalt der QuelleBorderie, Quentin, Rowena Banerjea, Stéphane Bonnet, Yannick Devos, Cristiano Nicosia, Christophe Petit, Ferréol Salomon, Nathalie Schneider, Barbora Wouters und Patrice Wuscher. „Géoarchéologies des contextes urbains : mieux comprendre les modalités de l'artificialisation des géosystèmes“. Archimède. Archéologie et histoire ancienne 7 (09.06.2020): 141–57. http://dx.doi.org/10.47245/archimede.0007.act.04.
Der volle Inhalt der QuelleTaleb, Rachid, Taieb Bessaad, Adil Yahdou, Fayçal Mehedi und Abdelkader Belboula. „Apport des techniques neuromimétiques à la commande d'un onduleur asymétrique à onze niveaux Application à l'alimentation d'une MASDE“. Journal of Renewable Energies 21, Nr. 4 (31.12.2018): 661–74. http://dx.doi.org/10.54966/jreen.v21i4.719.
Der volle Inhalt der QuelleHenniquau, D., C. Vanbesien-Mailliot, P. Falez, P. Devienne, A. Vlandas, A. Cappy und V. Hoel. „Les systèmes neuroinspirés appliqués à la vision artificielle : pédagogie et interdisciplinarité“. J3eA 21 (2022): 1023. http://dx.doi.org/10.1051/j3ea/20221023.
Der volle Inhalt der QuelleBoissier, Olivier. „Du comportement moral des agents autonomes et artificiels. Quelles réflexions éthiques au sein des systèmes sociotechniques ?“ RIMHE : Revue Interdisciplinaire Management, Homme & Entreprise 36, Nr. 3 (2019): 81. http://dx.doi.org/10.3917/rimhe.036.0081.
Der volle Inhalt der QuelleBange, Christian. „La réception de la nomenclature binominale et la diffusion du linnéisme en France au XVIIIe siècle“. Bulletin de la société linnéenne de Lyon 86, Nr. 3 (2017): 75–95. http://dx.doi.org/10.3406/linly.2017.17823.
Der volle Inhalt der QuelleDissertationen zum Thema "Systèmes de spins artificiels"
Massouras, Maryam. „Artificial spin ice : from statistical physics to stochastic computing“. Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0143.
Der volle Inhalt der QuelleSince their introduction in 2006, artificial spin ice systems have sparked an interest for their similarity with frustrated systems such as water ice or some pyrochlores. These networks of interacting nanomagnets can be observed using simple microscopy techniques and be tailored at will. In this work, we have studied customised geometries in order to observe the evolution of dipolar interactions and develop a device. First, we have studied the tuning of the dipolar interactions induced by rotation of the elements of the square geometry. For an as-grown system that the ground state evolution from antiferromagnetic to ferromagnetic orders observed is consistent with dipolar computations. Taking into account the long-range interactions in our Monte Carlo simulations, we have described the total dipolar energy along with the vertex populations of our system with all its tilted networks. This has led to a study of the thermodynamics of our system and a unique effective could be ascribed. Secondly, we have taken an interest into the possibility of tailoring these artificial spin systems for applications in random number generation. We have seen that these systems are a better fit exploiting domain wall propagation rather than reversals by coupling. We have then established that the main challenge to overcome in large connected structures is the trade-off between nucleation field from the outputs and depinning field of the upper part of the nanostructure. Indeed, it is necessary to ensure than the domain wall propagating in the structure is indeed the injected one and that no parasitic nucleation occurs which is overcome this issue. The domain wall propagation has been characterised in terms of propagation fields and types of reversals. We have shown that our optimised system exhibits reversal induced by the injected domain wall mainly in unidimensional fashion with clear stochastic behaviour. The characterisation of this behaviour has shown that a mean weight value describes the choices observed which do not exhibit any correlation. Our artificial spin system therefore behaves as a Galton board, the prime device for random number generation. This PhD work has shown the versatility of artificial spin systems as spin ice for understanding the influence of tuned interactions in their thermodynamics. This work has also demonstrated their versatility for an application with the characterisation of their stochastic behaviour through an optimisation of the geometry
Perrin, Yann. „Réseaux artificiels à frustration géométrique“. Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY054/document.
Der volle Inhalt der QuelleSince a decade, a big interest has grown about geometrically frustrated nanomagnets arrays. They allow experimental realisation of theoretical spin models, that sometimes have no natural counterpart. In addition to their high flexibility, these networks provide a direct access to local spin configurations. The work presented in this manuscript aims to realise experimentally the so-called "square ice" model, using nanomagnets array. This highly frustrated model has already been theoretically studied. It is found to have a massively degenerated ground state, associated to a residual entropy at low temperature. In this thesis, we present two approaches that should achieve the square ice model.The first one consists to introduce additional magnets in the conventional square nanomagnets array. They can act through an effective coupling between the magnets of the initial network. The condition required is that additional magnets should behave passively against main magnets. We will show in a theoretical study that a reciprocal space analysis of the Hamiltonian fails to grasp the essential properties of the new model. By computing the energy of a number of random spins configurations, we will show that the square ice model can be achieved. A special attention will be paid to the influence of the range and the nature of magnets interactions. Using finite-difference micromagnetic simulations, we will determine the geometries adapted to an experimental realisation. We were able to make such networks using the microfabrication tools available in the laboratory. Our magnets are made of thin permalloy films. This allows the magnets to reach a superparamagnetic regime during a thermal annealing. We observed that additional magnets have the expected influence on square nanomagnets arrays. However, an experimental bias caused a high residual magnetisation in some networks. This effect has unfortunately hided the correlations expected in the square ice model. But this work shown an unexpected effect. Additional magnets appear to enhance thermal fluctuations in the networks.The second approach is to raise the magnets oriented in one of the two directions of the square lattice. For the study of this new system, a methodology similar to that described above will be used. Theoretically, the control of the elevation can explore three different spins models, including the square ice model. We made arrays for different elevations, estimated by micromagnetic calculations. For technical reasons, we worked with thick permalloy nanomagnets. Their thickness makes them insensitive to thermal fluctuations. Fluctuations are then introduced using a decreasing rotating magnetic field. Our simulations show that this particular dynamic stimulates emergence of ferromagnetic correlations. The field demagnetisation then reduce the elevations required for achieving the square ice model. We have experimentally observed that the elevation has an effect perfectly consistent with our previsions. Experimental structure factors show that we succeed to achieve the square ice model with nanomagnets. This approach allowed us to observe, for the first time, a Coulomb phase in the real space. This work opens interesting perspectives for studying the excitations of this phase. It has previously been shown that they are similar to classical magnetic monopoles
Brunel, Vivien. „Systèmes de spins quantiques unidimensionnels. Désordre et impuretés“. Phd thesis, Université Paris Sud - Paris XI, 1999. http://tel.archives-ouvertes.fr/tel-00000893.
Der volle Inhalt der QuelleFrançois, Olivier. „Systèmes de spins synchronisés : modèles de Hopfield stochastiques“. Grenoble 1, 1992. http://www.theses.fr/1992GRE10020.
Der volle Inhalt der QuelleChen, Linxiao. „Cartes planaires aléatoires couplées aux systèmes de spins“. Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS096/document.
Der volle Inhalt der QuelleThe aim of this thesis is to improve our understanding of random planar maps decorated by statistical physics models. We examine three particular models using tools coming from analysis, combinatorics and probability. From a geometric perspective, we focus on the interface properties and the local limits of the decorated random maps. The first model defines a family of random quadrangulations of the disk decorated by an O(n)-loop model. After completing the proof of its phase diagram initiated in [BBG12c] (Chap. II), we look into the lengths and the nesting structure of the loops in the non-generic critical phase (Chap. III). We show that these statistics, described as a labeled tree, converge in distribution to an explicit multiplicative cascade when the perimeter of the disk tends to infinity. The second model (Chap. IV) consists of random planar maps decorated by the Fortuin-Kasteleyn percolation. We complete the proof of its local convergence sketched in [She16b] and establish a number of properties of the limit. The third model (Chap. V) is that of random triangulations of the disk decorated by the Ising model. It is closely related to the O(n)-decorated quadrangulation when n=1. We compute explicitly the partition function of the model with Dobrushin boundary conditions at its critical point, in a form ameneable to asymptotics. Using these asymptotics, we study the peeling process along the Ising interface in the limit where the perimeter of the disk tends to infinity.Key words. Random planar map, O(n) loop model, Fortuin-Kasteleyn percolation, Ising model, local limit, interface geometry
Chioar, Ioan-Augustin. „Glaces kagomé de spins artificiels : de la dégénérescence à courte-portée vers l'ordre dipolaire“. Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAY033/document.
Der volle Inhalt der QuelleArtificial spin networks were initially proposed as toy-spin models destined for the investigation of magnetic frustration effects in two-dimensional spin lattices, a complementary approach to the study of the magnetic frustration encountered in spin ice pyrochlores. Generally fabricated via lithography techniques, these arrays of nano-scale magnetic islands can be designed at-will. Given the size and shape of the elements, their magnetization is almost uniform throughout their volume, thus making these islands act like classical Ising spins. Combined with the possibility of individually imaging the magnetic degrees of freedom in real space, these systems offer an almost infinite playground for the investigation of competing interactions in magnetostatic frameworks and potential for the experimental discovery of novel and exotic magnetic phases. However, unlike their condensed matter counterparts, first-generation artificial spin networks are insensitive to thermal fluctuations, requiring other driving mechanisms for accessing their complex low-energy manifolds. A field-protocol has been employed for driving such networks towards their ground-state configurations, although they only partially manage to accommodate pair-island interactions. More recently, thermally-active artificial spin networks have been introduced, surpassing the limits of demagnetized arrays in the quest for exotic low-energy spin textures.This thesis presents experimental and numerical studies performed on artificial kagome spin arrays, one of the most frustrated two-dimensional lattices. The kagome spin ice geometry has received most of the community's attention as it presents highly degenerate manifolds and unconventional spin textures. Within a dipolar long-range framework, it displays a low-temperature regime characterized by the coexistence of a crystalline phase, associated to the magnetic charge, and a disordered spin lattice. While demagnetizing such artificial kagome arrays cannot access this exotic state, thermally-active networks can locally retrieve such a phase, creating crystallites of antiferromagnetically-ordered magnetic charges. The first part of this work presents the experimental protocol employed to this purpose. A kinetic model is also proposed that successfully captures the observed experimental features and explains the efficiency of this approach.The second part of the current thesis presents a study of a novel artificial spin ice system, the artificial kagome Ising network. This network primarily differs from the kagome spin ice array by having its magnetic moments pointing along the vertical axis. A recent study of this system has concluded that, after demagnetization, these two artificial kagome networks display similar pairwise spin correlation development and their final frozen states can be well characterized by short-range interaction models. Through the use of demagnetization protocols, magnetic force microscopy and Monte Carlo simulations, it is demonstrated that long-range dipolar interactions between the magnetic elements cannot be neglected when describing the remanent states of demagnetized artificial kagome Ising networks. These results assess the limits of the reported universal behavior of artificial kagome lattices and enrich the spectrum of magnetic phases that could be achieved with such nanostructured systems. Indeed, Monte Carlo simulations indicate that this kagome Ising network presents a different low-energy behavior than kagome spin ice, the incipient stages of which have been accessed experimentally, but its dipolar ground-state configuration remains unknown. Nevertheless, by inspecting the low-temperature thermodynamic features of this array and through the use of a geometrical construction, a ground-state candidate is provided
Ponthieu, Raphaël. „Les fourmis et les machines : interfacer systèmes vivants et systèmes artificiels“. Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC072/document.
Der volle Inhalt der QuelleWithin the animal kingdom social insects fascinate humans. Especially ants, which are capable of adapting to various environments and taking advantage of their biotopes. Observing practices that we would have thought to be exclusive to humans – such as farming (of mushrooms) or breeding (of aphids) – spurs the will to understand by which mean ants operate. It turns out that ants achieve certain tasks in different ways than humans. For instance, to find the shortest path to a food source, or the best nest to migrate to; the colony can make a collective decision, decentralized and without the need of direct comparisons by individuals. My work has consisted of the elaboration and use of new methods to study ants. Two complementary objectives have been chosen to drive the work: implementation of a biohybrid system and assessing the means of and limits to controlling the behaviour of ants. The first objective consists of asking ourselves what will happen if we connected an ant colony with a computer For this I have designed apparatus that permit interaction between those two entities. It involved giving sight to the computer into what the colony was doing, then providing ways for the computer to act on the colony. To do so, I designed and tried out tools to monitor the activity of colonies as well as modular environments which ants can inhabit. I designed an embedded system that records and analyses activity of ant colonies on a micro-computer. I designed and 3D printed modules of various sizes that can be assembled together to form a structurally varied environment. For the computer to be able to act upon ant behaviour, I chose to endow it with the capability of modifying environmental conditions, at particular temperatures. Once the system was built, I conducted experiments to assess how local changes of temperature affect ant behaviour. This characterisation of behaviour under temperature changes sheds light on the relation of ants with their environment. This permitted the exploration of questions of control of behaviour of ants by a machine. The use of temperature having proved its capacity to modulate the local occupancy density, I then have been able to show that it was possible to confine an ant in a set location. Finally, I implemented a closed feedback loop system, in which the temperature used to confine the ant is dependent on the ant activity in real time. This last experiment shed light on the complexity of the dynamic relation between ants and their environments and opened new perspectives for future investigations. During this research, many tools were developed. Functional prototypes of moduary environments have demonstrated the relevance of using 3D printers for the study of ants. The various tools for monitoring, recording and processing video data provide new and innovative experimental possibilities and can be used for other studies, especially over long periods of time. Temperature control devices have as well been designed using rapid prototyping tools, making them accessible, scalable and reproducible in an open source approach
Loireau, Maud. „Espaces, ressources, usages : spatialisation des interactions dynamiques entre les systèmes sociaux et les systèmes écologiques au Sahel nigérien“. Montpellier 3, 1998. http://www.theses.fr/1998MON30058.
Der volle Inhalt der QuelleNagy, Zoltan. „Systèmes intégrables et algèbres de réflexion dynamiques“. Cergy-Pontoise, 2005. http://biblioweb.u-cergy.fr/theses/05CERG0270.pdf.
Der volle Inhalt der QuelleThis thesis is a contribution to the study of different dynamical quadratic algebras and their applications to integrable systems. Dynamical quadratic algebras are generalizations of the reflection algebra introduced by Cherednik to deal with integrable systems on the half-line, and more generally with integrable systems with open boundary conditions. We define two dynamical quadratic algebras : fully dynamical and semi-dynamical. The former is a simple generalization of the boundary elliptic quantum group, the latter is a new structure. We show in both cases how to build families of commuting Hamiltonians as quantum analogues of the trace of powers of the classical Lax-matrix. We also show, making use of the comodule structure which we elucidate, how to construct spin chain type Hamiltonians using the representations of these algebras as building blocks. These results are self-contained in the sense that they make no use of the vertex-IRF correspondence linking dynamical and non-dynamical algebras
Bocquet, Marc. „Chaînes de Spins, Fermions de Dirac, et Systèmes Désordonnés“. Phd thesis, Ecole Polytechnique X, 2000. http://tel.archives-ouvertes.fr/tel-00001560.
Der volle Inhalt der QuelleBücher zum Thema "Systèmes de spins artificiels"
Canada. Dept. of Foreign Affairs and International Trade. Telecommunications : agreement between the Government of Canada and the Government of the United States of America concerning the operation of commercial remote sensing satellite systems (with annex), Washington, June 16, 2000, in force June 16, 2000 =: Télécommunications : accord entre le gouvernement du Canada et le gouvernement des États-Unis d'Amérique concernant l'exploitation de systèmes commerciaux de télédétection par satellite (avec annexe), Washington, le 16 juin 2000, en vigueur le 16 juin 2000. Ottawa, Ont: Minister of Public Works and Government Services Canada = Ministre des travaux publics et services gouvernementaux Canada, 1998.
Den vollen Inhalt der Quelle findenCodding, George A. The future of satellite communications. Boulder, Colo: Westview Press, 1990.
Den vollen Inhalt der Quelle findenIEEE Global Telecommunications Conference (2001 San Antonio, Tex.). GLOBECOM '01: IEEE Global Telecommunications Conference : San Antonio, Texas, USA, 25-29 November, 2001. Piscataway, New Jersey: IEEE, 2001.
Den vollen Inhalt der Quelle findenCollins, Harry M. Experts artificiels. Machines intelligentes et savoir social. Seuil, 1992.
Den vollen Inhalt der Quelle findenCodding, George A. Future of Satellite Communications. Taylor & Francis Group, 2019.
Den vollen Inhalt der Quelle findenCodding, George A. Future of Satellite Communications. Taylor & Francis Group, 2019.
Den vollen Inhalt der Quelle findenFuture of Satellite Communications. Taylor & Francis Group, 2019.
Den vollen Inhalt der Quelle findenIEEE Global Telecommunications Conference. Inst Elect & Electronic Engineers, 2001.
Den vollen Inhalt der Quelle findenGalotti, Vincent P. Future Air Navigation System (fans). Taylor & Francis Group, 2019.
Den vollen Inhalt der Quelle findenGalotti, Vincent P. Future Air Navigation System (fans). Taylor & Francis Group, 2020.
Den vollen Inhalt der Quelle findenBuchteile zum Thema "Systèmes de spins artificiels"
DEVILLERS, Laurence. „Les formes affectives et sociales des robots“. In L’explosion des formes de vie, 183–93. ISTE Group, 2020. http://dx.doi.org/10.51926/iste.9005.ch10.
Der volle Inhalt der QuelleFAGES, François, und Franck MOLINA. „La cellule, un calculateur analogique chimique“. In Approches symboliques de la modélisation et de l’analyse des systèmes biologiques, 255–74. ISTE Group, 2022. http://dx.doi.org/10.51926/iste.9029.ch7.
Der volle Inhalt der Quelle„Künstliche Nomenklaturen in der Wissenschaft und Technik: Chemie, Medizin, Pharmazie Artificial Systems of Names in Science and Technology: Chemistry, Medicine, Pharmacology Les systèmes artificiels de noms propres pratiqués dans les sciences et les techniques“. In Namenforschung / Name Studies / Les noms propres, Part 2, herausgegeben von Ernst Eichler, Gerold Hilty, Heinrich Löffler, Hugo Steger und Ladislav Zgusta. Berlin • New York: Walter de Gruyter, 1996. http://dx.doi.org/10.1515/9783110148794.2.19.1637.
Der volle Inhalt der QuelleKonferenzberichte zum Thema "Systèmes de spins artificiels"
Aukauloo, Ally. „S'inspirer de la nature pour produire de l'énergie. Photosynthèse artificielle à l'Université Paris-Saclay“. In MOlecules and Materials for the ENergy of TOMorrow. MSH Paris-Saclay Éditions, 2021. http://dx.doi.org/10.52983/nova3845.
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