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Book Description
DEUX SERIES DE COMPOSES DE BASSE DIMENSIONNALITE A BASE DE TERRE-RARE, D'YTTRIUM, D'INDIUM ET DE SCANDIUM ONT ETE SYNTHETISES ET CARACTERISES, LES OXOCUPRATES D'UNE PART ET LES BISPHTALOCYANINES D'AUTRE PART. DANS LE PREMIER CHAPITRE EST PRESENTE UN RAPPEL THEORIQUE DES MECANISMES D'ECHANGE DE SYSTEMES MAGNETIQUES DE BASSE DIMENSIONNALITE. UNE PARTIE DE CE CHAPITRE CONCERNE LES TECHNIQUES DE CALCUL UTILISEES. LE SECOND TRAITE DU FERROMAGNETISME MOLECULAIRE. NOUS Y FAISONS UN BREF HISTORIQUE, LEQUEL EST LOIN D'ETRE EXHAUSTIF. LE TROISIEME PORTE SUR LA CARACTERISATION STRUCTURALE ET L'ANALYSE DES DONNEES MAGNETIQUES DES OXOCUPRATES DE TERRES RARES. LES INTERACTIONS MAGNETIQUES DE OXOCUPRATES D'INDIUM DE LUTETIUM ET DE SCANDIUM Y SONT DETERMINEES A L'AIDE DE L'HAMILTONIEN D'HEISENBERG. LES CONSTANTES AINSI OBTENUES EVOLUENT DE MANIERE LOGIQUE AVEC LES DONNEES CRISTALLOGRAPHIQUES. LE DERNIER CHAPITRE EST CONSACRE AUX BISPHTALOCYANINES, A LEURS PROPRIETES PHYSIQUES. DU FERROMAGNETISME MOLECULAIRE UNIDIMENSIONNEL A BASSE TEMPERATURE EST MIS ICI EN EVIDENCE POUR LA PREMIERE FOIS. L'INTERPRETATION DE CE PHENOMENE A FAIT APPEL A UN MODELE A DEUX SOUS-RESEAUX, L'UN DE SPIN S=1/2, LE SECOND ORBITAL L=1/2, DU FAIT DE LA DELOCALISATION DU RADICAL SUR LES DEUX MACROCYCLES DE LA MOLECULE SANDWICH. LE FORMALISME D'ANDERSON A ETE UTILISE POUR DETERMINER L'EXPRESSION DE L'HAMILTONIEN AINSI QUE LES PROPRIETES MAGNETIQUES
Book Description
DEUX SERIES DE COMPOSES DE BASSE DIMENSIONNALITE A BASE DE TERRE-RARE, D'YTTRIUM, D'INDIUM ET DE SCANDIUM ONT ETE SYNTHETISES ET CARACTERISES, LES OXOCUPRATES D'UNE PART ET LES BISPHTALOCYANINES D'AUTRE PART. DANS LE PREMIER CHAPITRE EST PRESENTE UN RAPPEL THEORIQUE DES MECANISMES D'ECHANGE DE SYSTEMES MAGNETIQUES DE BASSE DIMENSIONNALITE. UNE PARTIE DE CE CHAPITRE CONCERNE LES TECHNIQUES DE CALCUL UTILISEES. LE SECOND TRAITE DU FERROMAGNETISME MOLECULAIRE. NOUS Y FAISONS UN BREF HISTORIQUE, LEQUEL EST LOIN D'ETRE EXHAUSTIF. LE TROISIEME PORTE SUR LA CARACTERISATION STRUCTURALE ET L'ANALYSE DES DONNEES MAGNETIQUES DES OXOCUPRATES DE TERRES RARES. LES INTERACTIONS MAGNETIQUES DE OXOCUPRATES D'INDIUM DE LUTETIUM ET DE SCANDIUM Y SONT DETERMINEES A L'AIDE DE L'HAMILTONIEN D'HEISENBERG. LES CONSTANTES AINSI OBTENUES EVOLUENT DE MANIERE LOGIQUE AVEC LES DONNEES CRISTALLOGRAPHIQUES. LE DERNIER CHAPITRE EST CONSACRE AUX BISPHTALOCYANINES, A LEURS PROPRIETES PHYSIQUES. DU FERROMAGNETISME MOLECULAIRE UNIDIMENSIONNEL A BASSE TEMPERATURE EST MIS ICI EN EVIDENCE POUR LA PREMIERE FOIS. L'INTERPRETATION DE CE PHENOMENE A FAIT APPEL A UN MODELE A DEUX SOUS-RESEAUX, L'UN DE SPIN S=1/2, LE SECOND ORBITAL L=1/2, DU FAIT DE LA DELOCALISATION DU RADICAL SUR LES DEUX MACROCYCLES DE LA MOLECULE SANDWICH. LE FORMALISME D'ANDERSON A ETE UTILISE POUR DETERMINER L'EXPRESSION DE L'HAMILTONIEN AINSI QUE LES PROPRIETES MAGNETIQUES
Author: Rénald David Publisher: ISBN: Category : Languages : fr Pages : 0
Book Description
Les oxydes de basse dimensionnalité présentent un intérêt scientifique croissant de par leurs propriétés magnétiques étonnantes : transition métamagnétique, aimantation en plateau.... Outre la compréhension de la nature de ces phénomènes, l'intérêt qui émerge concerne les propriétés indirectement associées à l'aimantation particulière de ces systèmes qui peuvent s'inscrire dans le champ de la « spintronique » ou du stockage. Nos travaux, en amont, concernent la synthèse et l'étude de nouveaux composés, essentiellement des oxydes de basses dimensions, qui amènent un regard nouveau sur le contexte de ce magnétisme particulier. L'objectif de cette thèse a donc été de préparer et de caractériser de nouveaux composés inédits, mais également de résoudre les relations structure-propriétés parfois complexes. Les résultats obtenus via un travail de synthèse réfléchi, ont permis d'identifier des systèmes chimiques favorables à la réalisation de matériaux de basse dimensionnalité magnétique. Plusieurs phases inédites aux propriétés remarquables ont pu être identifiées. Il est clair que l'ensemble des comportements observés, 2D-Ising-FM, SCM, plateaux d'aimantation, extrusion réversible, sont tous relativement originaux et nous ont conduit à des avancées importante dans la compréhension du magnétisme de sous-unités en faible interaction.
Author: Ahmed Belasri Publisher: Springer Nature ISBN: 9811554447 Category : Technology & Engineering Languages : en Pages : 659
Book Description
This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Author: Jean-Marie Basset Publisher: Wiley-VCH ISBN: 9783527319725 Category : Science Languages : en Pages : 725
Book Description
Covering everything from the basics to recent applications, this monograph represents an advanced overview of the field. Edited by internationally acclaimed experts respected throughout the community, the book is clearly divided into sections on fundamental and applied surface organometallic chemistry. Backed by numerous examples from the recent literature, this is a key reference for all chemists.
Author: David Adler Publisher: Springer Science & Business Media ISBN: 1489922601 Category : Science Languages : en Pages : 448
Book Description
The Institute for Amorphous Studies was founded in 1982 as the international center for the investigation of amorphous mate rials. It has since played an important role in promoting the und er standing of disordered matter in general. An Institute lecture series on "Fundamentals of Amorphous Materials and Devices" was held during 1982-83 with distinguished speakers from universities and industry. These events were free and open to the public ,and were attended by many representatives of the scientific community. The lectures themselves were highly successful inasmuch as they provided not only formal instruction but also an opportunity for vigorous and stimulating debate. That last element could not be captured within the pages of a book I but the lectures concentrated on the latest advances in the field I which is why their essential contents are he re reproduced in collective form. Together they constitute an interdisciplinary status report of the field. The speakers brought many different viewpoints and a variety of back ground experiences io bear on the problems involved I but though language and conventions vary I the essential unity of the concerns is very clear I as indeed are the ultimate benefits of the many-sided approach.
Author: Charles Coulston Gillispie Publisher: Princeton University Press ISBN: 1400824613 Category : Science Languages : en Pages : 615
Book Description
By the end of the eighteenth century, the French dominated the world of science. And although science and politics had little to do with each other directly, there were increasingly frequent intersections. This is a study of those transactions between science and state, knowledge and power--on the eve of the French Revolution. Charles Gillispie explores how the links between science and polity in France were related to governmental reform, modernization of the economy, and professionalization of science and engineering.
Author: Joshua Landy Publisher: ISBN: Category : History Languages : en Pages : 416
Book Description
The Re-Enchantment of the World is an interdisciplinary volume that challenges the long-prevailing view of modernity as "disenchanted." There is of course something to the widespread idea, so memorably put into words by Max Weber, that modernity is characterized by the "progressive disenchantment of the world." Yet what is less often recognized is the fact that a powerful counter-tendency runs alongside this one, an overwhelming urge to fill the vacuum left by departed convictions, and to do so without invoking superseded belief systems. In fact, modernity produces an array of strategies for re-enchantment, each fully compatible with secular rationality. It has to, because God has many "aspects"--or to put it in more secular terms, because traditional religion offers so much in so many domains. From one thinker to the next, the question of just what, in religious enchantment, needs to be replaced in a secular world receives an entirely different answer. Now, for the first time, many of these strategies are laid out in a single volume, with contributions by specialists in literature, history, and philosophy.
Author: E. C. Spary Publisher: University of Chicago Press ISBN: 0226768708 Category : Science Languages : en Pages : 339
Book Description
The royal Parisian botanical garden, the Jardin du Roi, was a jewel in the crown of the French Old Regime, praised by both rulers and scientific practitioners. Yet unlike many such institutions, the Jardin not only survived the French Revolution but by 1800 had become the world's leading public establishment of natural history: the Muséum d'Histoire Naturelle. E. C. Spary traces the scientific, administrative, and political strategies that enabled the foundation of the Muséum, arguing that agriculture and animal breeding rank alongside classification and collections in explaining why natural history was important for French rulers. But the Muséum's success was also a consequence of its employees' Revolutionary rhetoric: by displaying the natural order, they suggested, the institution could assist in fashioning a self-educating, self-policing Republican people. Natural history was presented as an indispensable source of national prosperity and individual virtue. Spary's fascinating account opens a new chapter in the history of France, science, and the Enlightenment.
Author: JEAN-LOUIS.. PAILLAUD
Author: JEAN-LOUIS.. PAILLAUD
Author: Rénald David
Author: Ahmed Belasri
Author: Jean-Marie Basset
Author: tucson Symposium on the use of analog and digital computers in hydrology
Author: David Adler
Author: Charles Coulston Gillispie
Author: Joshua Landy
Author: E. C. Spary
Author: Universidade de Coimbra