CONTRIBUTION A L'ETUDE DE LA RELAXATION PARAMAGNETIQUE DANS LES CHAMPS MAGNETIQUES INTENSES PULSES PDF Download

Author: C.. PANGALOS
Publisher:
ISBN:
Category :
Languages : fr
Pages :

View

Book Description
ETUDE DE DEUX GROUPES DE COMPOSES: LES COMPOSES DES IONS DE TERRES RARES D'UNE PART, LES COMPOSES DES IONS DU GROUPE DU FER D'AUTRE PART

Author: JEAN-ERIC.. WEGROWE
Publisher:
ISBN:
Category :
Languages : fr
Pages : 260

View

Book Description
UNE ETUDE EXPERIMENTALE DE LA DYNAMIQUE DE L'AIMANTATION A ETE REALISEE SUR UN ENSEMBLE D'ECHANTILLONS MAGNETIQUES NANOSTRUCTURES A BASSE TEMPERATURE. CETTE ETUDE MET EN EVIDENCE UN COMPORTEMENT THERMIQUE DE LA RELAXATION MAGNETIQUE LENTE, NON MESURE JUSQU'A PRESENT, ET CONTRAIRE AUX PREDICTIONS DES MODELES CLASSIQUES USUELS D'ACTIVATION THERMIQUE. UNE COMPARAISON ENTRE LES MESURES EFFECTUEES A L'ECHELLE D'UNE NANOPARTICULE ET SUR UN GRAND ENSEMBLE DE NANOPARTICULES PERMET D'EXPLICITER LE PASSAGE ENTRE UNE RELAXATION APPROXIMATIVEMENT EXPONENTIELLE A UNE RELAXATION LOGARITHMIQUE. ELLE PERMET DE MEME DE LOCALISER LE COMPORTEMENT THERMIQUE ANORMAL AUX FLUCTUATIONS A L'ECHELLE NANOSCOPIQUE. QUELQUES INTERPRETATIONS SONT PASSEES EN REVUE CONCERNANT LA NATURE POSSIBLE DES FLUCTUATIONS ANORMALES OBSERVEES. L'EFFET TUNNEL QUANTIQUE DE L'AIMANTATION EST MENTIONNE, AINSI QUE LA POSSIBILITE DE L'EMERGENCE D'UN BRUIT QUANTIQUE. PAR AILLEURS, UNE INTERPRETATION EN TERME DE REPONSE DU SYSTEME A LA VARIATION INITIALE DE CHAMP MAGNETIQUE EST PROPOSEE. CETTE APPROCHE PERMET DE FOCALISER L'ETUDE DES FLUCTUATIONS SUR D'EVENTUELS EFFETS INHABITUELS DUS A L'INTERACTION DU SYSTEME MAGNETIQUE AVEC SON ENVIRONNEMENT

Author: X.. GILLE
Publisher:
ISBN:
Category :
Languages : fr
Pages :

View

Book Description
LES TEMPS DE RELAXATION SPIN RESEAU DE MOLECULES ORGANIQUES PORTEES DANS UN ETAT TRIPLET, PIEGEES DANS DES MATRICES CRISTALLINES OU VITREUSES, DEPENDENT DE L'ORIENTATION DU CHAMP MAGNETIQUE APPLIQUE PAR RAPPORT AUX AXES MOLECULAIRES OU CRISTALLINS. ETUDE D'UN MECANISME DE RELAXATION BASE SUR LA MODULATION DE L'HAMILTONIEN DE STRUCTURE FINE

Author: Jean-Gérard Théobald
Publisher:
ISBN:
Category :
Languages : fr
Pages : 234

View

Book Description

Author: Elisabeth Ribes
Publisher:
ISBN:
Category :
Languages : fr
Pages : 8

View

Book Description

Author: Jean Gérard THÉOBALD
Publisher:
ISBN:
Category :
Languages : en
Pages :

View

Book Description

Author: Michel Crouzeix
Publisher:
ISBN:
Category :
Languages : fr
Pages : 89

View

Book Description
DEVELOPPEMENT DE L'EQUATION DE MOUVEMENT DE LA MATRICE DENSITE D'UN SYSTEME DE SPINS DECRIT PAR UN HAMILTONIEN OBEISSANT A UN PROCESSUS DE MARKOV. EXPLICITATION DU SYSTEME D'EQUATIONS FONDAMENTALES PERMETTANT DE SIMULER LES RAIES DE RESONANCE ET METHODE DE RESOLUTION DE CE SYSTEME D'EQUATIONS. APPLICATION DE LA THEORIE GENERALE AU CAS D'UN SPIN ELECTRONIQUE S=1/2 INTERAGISSANT AVEC UN NOYAU DE SPIN I=0. AFIN D'ETUDIER L'EVOLUTION DES RAIES DE RESONANCE EN FONCTION DU TEMPS DE CORRELATION, DES DIFFERENTS MODELES DE REORIENTATION ET DES LARGEURS DE RAIES. ETUDE EXPERIMENTALE DES MOUVEMENTS MOLECULAIRES DE LA SONDE RADICALAIRE TETRAMETHYL-2,2,6,6 P-OCTYLOXYBENZOYLAMINO-4 PIPERIDINOXYLE A FAIBLE CONCENTRATION DANS UN SOLVANT VISQUEUX, LE T-BUTANOL

Author: P. Diehl
Publisher: Springer
ISBN: 9783642653148
Category : Science
Languages : en
Pages : 0

View

Book Description
Nuclear magnetic resonance spectroscopy, which has evolved only within the last 20 years, has become one of the very important tools in chemistry and physics. The literature on its theory and application has grown immensely and a comprehensive and adequate treatment of all branches by one author, or even by several, becomes increasingly difficult. This series is planned to present articles written by experts working in various fields of nuclear magnetic resonance spectroscopy, and will contain review articles as well as progress reports and original work. Its main aim, however, is to fill a gap, existing in literature, by publishing articles written by specialists, which take the reader from the introductory stage to the latest development in the field. The editors are grateful to the authors for the time and effort spent in writing the articles, and for their invaluable cooperation. The Editors Contents c. W. Hilbers and C. MacLean NMR of Molecules Oriented in Electric Fields.

Author: Pericles S. Theocaris
Publisher: Springer
ISBN: 3540357890
Category : Science
Languages : en
Pages : 365

View

Book Description
Photoelasticity as an experimental method for analyzing stress fields in mechanics was developed in the early thirties by the pioneering works of Mesnager in France and Coker and Filon in England. Almost concurrently, Föppl, Mesmer, and Oppel in Germany contributed significantly to what turned out to be an amazing development. Indeed, in the fifties and sixties a tremendous number of scientific papers and monographs appeared, all over the world, dealing with various aspects of the method and its applications in experimental stress analysis. All of these contributions were based on the so-called Neumann-Maxwell stress-opticallaw; they were developed by means of the classical methods of vector analysis and analytic geometry, using the conventionallight-vector concept. This way of treating problems of mechanics by photoelasticity indicated many shortcomings and drawbacks of this classical method, especially when three-dimensional problems of elasticity had to be treated and when complicated load and geometry situations existed. Meanwhile, the idea of using the Poincare sphere for representing any polarization profile in photoelastic applications was introduced by Robert in France and Aben in the USSR, in order to deal with problems of polarization oflight passing through aseries of optical elements (retarders andjor rotators). Although the Poincare-sphere presentation of any polarization profile con stitutes a powerful and elegant method, it exhibits the difficulty of requiring manipulations in three-dimensional space, on the surface of the unit sphere. However, other graphical methods have been developed to bypass this difficulty.

Author: B. Catoire
Publisher: Springer
ISBN:
Category : Medical
Languages : en
Pages : 328

View

Book Description
"Publication partially sponsored by MRT (French Ministry of Research and Technology."