ETUDE EFFECTUEE SUR DES ECHANTILLONS D'AG, NI, AL ET CU. LES SPECTRES DE FROTTEMENT INTERNE SONT EN FAIT COMPOSES DE PICS DE RELAXATION ET DE MAXIMA LIES A L'AMPLITUDE MAXIMALE DE LA RELATION. LES CONDITIONS D'APPARITION DES PICS ET LEUR COMPORTEMENT AU COURS DE RECUITS SUCCESSIFS, DIFFERENTS SELON L'ENERGIE DE FAUTE MONTRENT QUE LES EFFETS OBSERVES SONT LIES A DES MOUVEMENTS DE DISLOCATIONS SITUEES DANS DES AMAS OU DES PAROIS DE POLYGONISATION PLUTOT QUE DANS LE RESEAU TRIDIMENSIONNEL

UN MODELE PLUS GENERAL DE LA RELAXATION EST PROPOSE, APPLICABLE TANT AUX MONOCRISTAUX QU'AUX POLYCRISTAUX, BASE SUR LA MONTEE DES DISLOCATIONS. LES VALEURS EXPERIMENTALES DES PARAMETRES DE RELAXATION DES METAUX DE STRUCTURE CUBIQUE A FACES CENTREES POLYCRISTALLINS ONT ETE PRECISEES. L'ORIGINE DE LA RELAXATION A ETE PRECISEE PAR UNE METHODE NOUVELLE SUR DES ECHANTILLONS BICRISTALLINS DE DESORIENTATION DEFINIE. L'EXISTENCE DE PICS DE RELAXATION A BASSE TEMPERATURE A ETE MISE EN EVIDENCE SUR DES METAUX DE FAIBLE ENERGIE DE FAUTE D'EMPILEMENTS, SAUF LE PB, ET DANS TOUS LES CAS DE PICS DE HAUTE TEMPERATURE. DES PICS SEMBLABLES AUX PICS TROUVES SUR DES POLYCRISTAUX ONT ETE TROUVES SUR DES MONOCRISTAUX ET DES BICRISTAUX, AVEC UNE INTENSITE MOINDRE

This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.

The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.