Дисертації з теми "Complex spin systems"
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Hoang, Danh tai. "Phase transition and Spin transport in Complex Systems : Frustrated spin systems, Molecular and Liquid Crystals." Thesis, Cergy-Pontoise, 2012. http://www.theses.fr/2012CERG0621/document.
Повний текст джерелаIn this thesis, we have used Monte Carlo simulations combined with different efficient techniques such as histogram methods to study the phase transitions and spin transport in various systems. The first part is devoted to the investigation of phase transition in frustrated spin systems: (i) the J_1-J_2 model with Ising spin in the full antiferromagnetic regime, (ii) the HCP lattice with both Ising and XY spin in the full antiferromagnetic regime. The results obtained show indeed a first-order transition as found earlier in other frustrated systems. The second part shows the ground state and phase transitions in molecular crystals and in dimer liquids. To deal with these systems, we have used the Potts model taking into the account the dipolar interaction to explain long-period layered structures experimentally observed. The results show amazing effects of this long-range interaction. The effect of surface exchange interaction has been considered in this work. Finally, we describe the resistivity of itinerant spins. We focused in particular on the effects of spin fluctuations in the phase transition region. Interesting results have been obtained showing a strong correlation between spin fluctuations and the behavior of the resistivity
Elbahrawy, Mohammed. "High field electron magnetic resonance in complex correlated spin systems." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-39380.
Повний текст джерелаHuang, Yang. "Analysis of NMR Spin-lattice Relaxation Dispersion on Complex Systems." Doctoral thesis, Umeå universitet, Kemiska institutionen, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-110721.
Повний текст джерелаLechner, Barbara Angelika Johanna. "Studying complex surface dynamical systems using helium-3 spin-echo spectroscopy." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/269776.
Повний текст джерелаAbdulhameed, Abbas Abdulazeez. "Combining SysML and SystemC to Simulate and Verify Complex Systems." Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2045/document.
Повний текст джерелаHeterogeneous Systems are complex and become very critical. These systems integrate software andhardware components with intensive interaction between them. In this context, there is a strongnecessity to develop methodologies and techniques to specify and validate these systems.In engineering, the requirements are the expression of needs on what a particular product or a serviceshould be or to make. They are used most of the time in a formal sense in the systems engineering.In this kind of systems, several types of requirements are present: non-functional requirements suchas the performance and the reliability and functional requirements such as the liveliness. To validatethese requirements of a system, an environment to simulate and to check the properties is essential.In our work, we propose a methodology based on SysML combined with SystemC and Promela/SPINto specify and validate complex systems. This approach is based on Model Driven Engineeringtechniques to irstly translate SysML models to systemC with the aim of simulation and to mapSysML behavioral diagrams to Promela/SPIN in order to verify temporal properties extracted fromthe requirements. The approach is experimented on case studies to demonstrate its feasibility
MACETTI, GIOVANNI. "TOPOLOGICAL DESCRIPTORS ENABLING NOVEL DISSECTIONS OF ELECTRON POSITION AND SPIN PROPERTIES IN COMPLEX MOLECULAR SYSTEMS." Doctoral thesis, Università degli Studi di Milano, 2019. http://hdl.handle.net/2434/615357.
Повний текст джерелаCalabrese, Pasquale. "Critical Behavior of Systems with Complex Symmetries." Doctoral thesis, Scuola Normale Superiore, 2005. http://hdl.handle.net/11384/85862.
Повний текст джерелаDel, Ferraro Gino. "Equilibrium and Dynamics on Complex Networkds." Doctoral thesis, KTH, Beräkningsvetenskap och beräkningsteknik (CST), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-191991.
Повний текст джерелаQC 20160904
Mantovani, Rocco. "Modelling complex systems in the severely undersampled regime: a Bayesian model selection approach." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18019/.
Повний текст джерелаWeber, Josef Andreas [Verfasser], Christoph Pascal [Akademischer Betreuer] [Gutachter] Hugenschmidt, Rudolf [Gutachter] Gross, and Claudia [Gutachter] Felser. "Spin-Polarized Positron Annihilation Spectroscopy : Investigation of Complex Metallic Systems / Josef Andreas Weber ; Gutachter: Rudolf Gross, Claudia Felser, Christoph Pascal Hugenschmidt ; Betreuer: Christoph Pascal Hugenschmidt." München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/112881935X/34.
Повний текст джерелаWeber, Josef Andreas Verfasser], Christoph Pascal [Akademischer Betreuer] [Gutachter] Hugenschmidt, Rudolf [Gutachter] [Gross, and Claudia [Gutachter] Felser. "Spin-Polarized Positron Annihilation Spectroscopy : Investigation of Complex Metallic Systems / Josef Andreas Weber ; Gutachter: Rudolf Gross, Claudia Felser, Christoph Pascal Hugenschmidt ; Betreuer: Christoph Pascal Hugenschmidt." München : Universitätsbibliothek der TU München, 2017. http://nbn-resolving.de/urn:nbn:de:bvb:91-diss-20170221-1325676-1-4.
Повний текст джерелаSchreiber, Georg R. "Systèmes désordonnés et frustrés: modèles champ moyen et problèmes d'optimisation combinatoire." Phd thesis, Université Paris Sud - Paris XI, 1997. http://tel.archives-ouvertes.fr/tel-00000825.
Повний текст джерелаSakellariou, Jason. "Inverse inference in the asymmetric Ising model." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00869738.
Повний текст джерелаGuillon, Thomas. "Calculs DFT et propriétés électriques de complexes à transition de spin." Toulouse 3, 2007. http://thesesups.ups-tlse.fr/813/.
Повний текст джерелаThe spin-crossover complexes exhibit a phenomenon of molecular bistability between two spin states (low-spin and high-spin states) energetically very close. They are of great interest for many potential applications in the fields of electronics and optics. The methods based on density functional theory (DFT) have proved to be efficient in the calculation of molecular structures, the calculation of vibrational frequencies modes, frequency shifts due to isotopic substitutions and the ability to assign all vibrational modes, the calculation of thermodynamic properties. . . As presented by our studies on the [Fe(phen)2(NCS)2], Fe[5-NO2-sal-N(1,4,7,10)], [Fe(L)(CN)2]. H2O, [Fe(TRIM)2]2+, [Fe(bpp)2]2+ and [Fe(PM-BiA)2(NCS)2] spin crossover complexes. Furthermore, our DFT calculations results demonstrate their potential in specific structural properties prediction for large size complexes such as the existence of conformers for the Fe[5-NO2-sal-N(1,4,7,10)] complex or the existence of a coordination number (6 - 7) change with the spin states change for the [Fe(L)(CN)2]. H2O complex, confirming suggestions or experimental results. Finally, we determined the microscopic electrical properties using DFT methods with the calculations of polarizability tensors. These calculations allowed us to identify and confirm the microscopic origin of the measured dielectric properties accompanying the spin transition, and understand the atypical behaviour of the dielectric permittivity thermal variation of some spin-crossover compounds
Abarenkova, Nina. "Etudes de systèmes intégrables ou de complexes faibles, en physique du solide et systèmes dynamiques discrets." Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE10068.
Повний текст джерелаKerzerho, Vincent. ""Analogue Network of Converters": a DfT Technique to Test a Complete Set of ADCs and DACs Embedded in a Complex SiP or SoC." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2008. http://tel.archives-ouvertes.fr/tel-00364546.
Повний текст джерелаLochenie, Charles [Verfasser], та Birgit [Akademischer Betreuer] Weber. "Spin Crossover Complexes : increasing cooperativity and adding fluorescence through extension of the π-system / Charles Lochenie ; Betreuer: Birgit Weber". Bayreuth : Universität Bayreuth, 2016. http://d-nb.info/1121676197/34.
Повний текст джерелаCherrier, Raphaël. "Étude de systèmes de spins complexes ou désordonnés : analogies avec la transition vitreuse structurelle." Phd thesis, Université Paul Sabatier - Toulouse III, 2003. http://tel.archives-ouvertes.fr/tel-00840704.
Повний текст джерелаBoukari, Abdou-Fadel. "Modélisation des actionneurs piézoélectriques pour le contrôle des systèmes complexes." Phd thesis, Paris, ENSAM, 2010. http://pastel.archives-ouvertes.fr/pastel-00006312.
Повний текст джерелаGuadri, Ahmed. "Architecture pour la reconfiguration en temps réel des systèmes complexes." Phd thesis, Ecole Centrale de Lille, 2009. http://tel.archives-ouvertes.fr/tel-00579518.
Повний текст джерелаBen, Salah Jaâfar. "Analyse et commande des systèmes non linéaires complexes : application aux systèmes dynamiques à commutation." Phd thesis, Université Claude Bernard - Lyon I, 2009. http://tel.archives-ouvertes.fr/tel-00599364.
Повний текст джерелаMarmois, Emilie. "Étude photophysique de nouveaux systèmes moléculaires fonctionnels basés sur les styrylpyridines." Thesis, Bordeaux 1, 2008. http://www.theses.fr/2008BOR13642/document.
Повний текст джерелаThis Ph.D. work mainly deals with the study of fundamental photophysical processes of new styrylpyridine-type organic compounds showing charge transfer, realised using picosecond fluorescence and femtosecond transient absorption. We were interested first in the excited-state behaviour of two new hemicyanines. Methylated dimethoxystyrylpyridines molecules showed the establishment of an equilibrium between syn and anti conformations which is different in the excited state compared to the ground state, represented by a fast relaxation time of fluorescence. The second time constant corresponds to depopulation of the the excited state by non-radiative pathways as isomerization and donor twist (« loose-bolt »). Concerning styrylpyridinium derivative where phenyl group was replaced by dimethylaminothiophene, our studies proved involvment of rotation of methylpyridinium group and intersystem crossing as relaxation pathways. Secondly, we were interested in complexation properties of ether-crown susbstituted styrylpyridine molecule. Our studies showed the presence of two complexation centers (one in the center of the crown, the other one on the nitrogen of pyridine) having a different selectivity for metallic cations. Stoichiometries were confirmed by analysis of the reorientation times of formed complexes. After the study of our different compounds as elementary « building–blocks » for more complex supramolecular systems, we were interested in their potential applications with the study of systems for collection and energy transfer. First, we highlighted the existence of an ultra fast (180 fs to 6 ps) and ultra efficient (>99.7%) intramolecular energy transfer in bichromophoric systems containing two ether-crowned styrylpyridines and dissymetrised by binding of a Mg2+ cation in only one crown. It occurs from the complexed part to the non-complexed one by coulombic interaction. Another envisaged application can be the construction of complexes containing transition metals for energy or information storage. We studied first the building of a supramolecular system based on phenanthroline and containing four free ether-crowns We also proved that there exists an equilibrium between singlet and triplet excited states in these compounds complexed with Copper(I) or Silver(I). Secondly, we studied formation of complexes binding two ether-crown substituted bipyridines to a Fe2+ ion. Such a complex has got some spin crossover properties. Then, we showed that the addition of Ba2+ ions induce formation of transition metals complexes with nanometric size
DOAN, BICH-THUY. "Developpement de methodes d'etudes de milieux complexes par spectroscopie de resonance magnetiques nucleaire a deux dimensions. Analyse de polyaromatiques de melanges petroliers par selection de systemes de spins. Mise au point de sequences 2d adaptees a la rmn in vivo." Paris 11, 1994. http://www.theses.fr/1994PA112088.
Повний текст джерелаJabri, Sana. "Génération de scénarios de tests pour la vérification de systèmes complexes et répartis : application au système européen de signalisation ferroviaire (ERTMS)." Phd thesis, Ecole Centrale de Lille, 2010. http://tel.archives-ouvertes.fr/tel-00584308.
Повний текст джерелаSohr, Martin. "Zabezpečovací systém pro rodinný dům." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219383.
Повний текст джерелаXiong, Ye. "Charge and spin transport in complex systems associated with spintronics." 2005. http://digital.library.okstate.edu/etd/umi-okstate-1542.pdf.
Повний текст джерелаElbahrawy, Mohammed Yehia Taha Ahmed [Verfasser]. "High field electron magnetic resonance in complex correlated spin systems / von Mohammed Yehia Taha Ahmed Elbahrawy." 2010. http://d-nb.info/1008110426/34.
Повний текст джерелаDE, VINCENZO Ilario. "Emergence and Exploitation of Collective Intelligence of Groups." Doctoral thesis, 2017. http://hdl.handle.net/11589/99172.
Повний текст джерелаBiswas, Rajib. "Dynamics of Water under Confinement and Studies of Structural Transformation in Complex Systems." Thesis, 2013. http://etd.iisc.ernet.in/2005/3405.
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