TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

The analytical electron microscope(AEM) is based on a conventional 200 keV transmission electron microscope(TEM) which has been augmented to include the functions of a scanning transmission electron microscope(STEM) and the scanning electron microscope(SEM). Since the electrons must penetrate through the specimen, the specimen dimensions must be no greater than 1 micrometer thick, and preferably in the range of 100 nm. Bulk specimens may be thinned to this range by a combination of mechanical, chemical, and ion sputtering techniques, all of which are available in the microanalysis laboratory. As an imaging tool, the AEM is capable of 0. 3 nm spatial resolution in the TEM mode, 1 nm resolution in the STEM mode, and 3 nm resolution in the SEM mode. Elemental microanalysis is carried out by means of energy dispersive x-ray spectrometry(EDS) and electron energy loss spectrometry(EELS), which together provide sensitivity to all elements with atomic number > 2. Quantitative analysis is carried out by means of a relative sensitivity factor method based on glass, mineral, and metal alloy standards.  2, record 1, English, - analytical%20electron%20microscope

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 CONT

Le Centre [London Centre for Nanotechnology (ou LCN]), abritera 200 m² de salles blanches ainsi qu'une gamme complète d'outils de caractérisation à l'échelle nanométrique. Un de ces outils sera un puissant microscope électronique analytique (ou AEM pour «Analytical Electron Microscope») d'une résolution de 1,4. Selon «Imperial College», il n'existe que trois microscopes de ce type au monde (Europe et Etats-Unis). Ses capacités d'analyse des matériaux donneront des informations sur la composition locale, les liaisons et l'état électronique des atomes. Les chercheurs du LCN espèrent que cet outil leur permettra de pénétrer les relations complexes qui existent entre l'arrangement atomique d'un matériau et les propriétés et les performances d'un dispositif fabriqué à partir de celui-ci. Les projets de recherche menés grâce à ce microscope concerneront les piles à combustible, les nanostructures magnétiques, les revêtements intelligents, les points quantiques semiconducteurs et la recherche biomédicale.  2, record 1, French, - microscope%20%C3%A9lectronique%20analytique

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 DEF

A method of transmission of funds through the postal system, rather than through the banking system. This method is particularly prevalent in European countries. [Klein, Gerald. Dictionary of Banking. Pitman Publishing, 1995].  1, record 2, English, - postal%20giro

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 CONT

Très vite cette formule sert aux transferts de fonds entre les comptes d'épargne : c'est le virement postal.  1, record 2, French, - virement%20postal

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 DEF

a method of sky-wave field strength reduction, which exploits the high absorption of extraordinary waves for transmission frequencies near the gyrofrequency, was proposed in 1965; the transmitting antenna for this system is required to radiate a signal polarized in which a manner that waves entering the ionosphere do so exclusively through extraordinary modes.  1, record 3, English, - orthogonal%20transmission

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 DEF

Méthode qui permet de réduire le champ de l'onde ionosphérique en utilisant l'absorption importante de l'onde extraordinaire aux fréquences voisines de la gyrofréquence. Il faut alors que le rayonnement de l'antenne d'émission soit polarisé de manière que l'onde qui arrive dans l'ionosphère se propage suivant le mode extraordinaire.  1, record 3, French, - transmission%20orthogonale

Record 3,  Textual support,  Spanish