Search results for "rfa"

Distribution and generation of traps in SiO2/Al2O3 gate stacks

2007

In this work we combine charge-pumping measurements with positive constant voltage stress to investigate trap generation in SiO2/ Al2O3 n-MOSFET. Trap density has been scanned either in energy or in position based on charge-pumping (CP) measurements performed under different operating conditions in terms of amplitude and frequency of the gate pulse. Our results have revealed that the traps are meanly localized shallow in energy level, deeper in spatial position and they are mostly generated near the Si/SiO2 interface. (C) 2007 Elsevier Ltd. All rights reserved.

La lecture numérique

2015

International audience; La lecture numérique n’est pas équivalente à la lecture sur papier. Depuis plus d’une vingtaine d’années, les données montrent un déficit général de la perception et de la compréhension, lié à l’emploi des supports électroniques. Ce problème est plus que jamais d’actualité avec le développement croissant des réseaux informatiques, des bibliothèques virtuelles, des logiciels multimédia, des liseuses et des tablettes qui impliquent de nouveaux comportements et de nouvelles compétences du lecteur. L’ouvrage synthétise les découvertes et les développements théoriques apportés par la psychologie cognitive et l’ergonomie cognitive dans le domaine de la lecture numérique. T…

An Interface Model for the Analysis of Anisotropy of Friction and Wear of Contact Surfaces

2008

Effective reference and current integration for large displacement interface

2016

The most common interface formulations proposed in literature are generally based on the restrictive hypothesis of small strains and small displacements and, even though their application to geometrically nonlinear problems is of paramount interest, only few contributions are available in literature. Motivations are probably due to the difficulties encountered on such formulation, as already mentioned by several authors. A pioneering formulation is the finite displacement three-dimensional interface developed by Ortiz and Pandolfi in [1], where normal and tangential traction components are evaluated with respect to the middle surface in the current configuration, producing a non-symmetric g…

Interface model for the nonlinear analysis of blocky structures of ancient Greek temples

2010

The presence of singularity surfaces with reference to the displacement field is a characteristic of a number of structural systems. Strong discontinuities are present in old masonry structures where dry joints connect the blocks or the mortar ageing suggests to neglect the adhesion properties. These structures cannot be considered a continuum but rather an assembly of blocks. These discontinuous structures could be modelled as an assembly of blocks interacting trough frictional joints whose mechanical behaviour is described by appropriate interface laws. In the present work an interface model present in literature is adopted, the double asperity model, which has been implemented in a stand…

Analyse semio-ergonomique d'interfaces multimédias

2002

Communication affichée; National audience; Cet article présente une démarche visant à combiner les méthodes d'analyses de produits multimédia utilisées dans deux champs différents : la sémiologie et l'ergonomie. Ces méthodes complémentaires donnent des résultat dans trois principales directions d'analyse. La capacité fonctionnelle du produit, sa facilité d'utilisation et son esthétique. Dans ce contexte, des méthodes d'analyse des signes qui composent les message permettent d'évoquer des hypothèses qui sont validées ou non à l'aide des méthodes d'observation en situation.

Editors' Foreword:Interfaces: Crossing Borders: Appropriations and Collaborations

2017

International audience

Sémiotique des interfaces : la promesse du flat design

2015

International audience; Popularisé par l'informatique, le concept d'interface a connu une extension considérable dans le domaine des sciences de la communication où il désigne tout dispositif favorisant l'échange et l'interaction entre différents actants (personnes, systèmes, objets, etc.) ; l'interface 1 n'est rien d'autre, en fait, que la face opérationnelle du canal de Shannon, le passage obligé de tout processus de communication et particulièrement de médiation puisqu'il s'agit alors d'introduire de la continuité entre deux systèmes aux propriétés différentes, de briser cette frontière commune à deux domaines : plus les éléments à apparier sont hétérogènes ou complexes, plus le rôle de …

Photoinduced Electron Transfer in a Porphyrin-Fullerene Dyad at a Liquid Interface

2022

The excited-state properties of an amphiphilic porphyrin–fullerene dyad and of its porphyrin analogue adsorbed at the dodecane/water interface are investigated by using surface second-harmonic generation. Although the porphyrin is formally centrosymmetric, the second-harmonic spectra of both compounds are dominated by the intense Soret band of the porphyrin. Polarization-selective measurements and molecular dynamics simulations suggest an angle of about 45° between the donor–acceptor axis and the interfacial plane, with the porphyrin interacting mostly with the nonpolar phase. Time-resolved measurements reveal a marked concentration dependence of the dynamics of both compounds upon Q-band e…

Gas-Phase Hydrogenation of Propionitrile Catalyzed by LnCu2 (Ln = La, Ce, Pr, Nd)

2007

The hydrogenation of propionitrile over binary copper−lanthanide intermetallic compounds (LnCu2, Ln = La, Ce, Pr, Nd) was studied in the gas phase. The results show that the reaction main product is the primary amine, the n-propylamine. To our knowledge, it is the first time that such behavior is reported for copper catalysts.