Frei Luís de Sousa d’Almeida Garrett. Pour une approche pragmatique du texte dramatique

In this article, we analyse, from a pragmatic point of view, the dialogue of the play Frei Luís de Sousa by Almeida Garrett and its translation made by Maxime Formont at the beginning of the 20th century and published in Livourne. We focus on the strategies used by the participants in the theatre discourse in order to consolidate and sometimes even to renegotiate their interpersonal relationship. Our main interest concerns the use of nouns and pronouns in the 1st Act. For a better understanding of the socio-historical context of this play, we propose a short introduction to the 19th century, in Portugal. We also present and analyse some important para-textual pieces of information that accompany the translation made by Maxime Formont.In this article, we analyse, from a pragmatic point of view, the dialogue of the play Frei Luís de Sousa by Almeida Garrett and its translation made by Maxime Formont at the beginning of the 20th century and published in Livourne. We focus on the strategies used by the participants in the theatre discourse in order to consolidate and sometimes even to renegotiate their interpersonal relationship. Our main interest concerns the use of nouns and pronouns in the 1st Act. For a better understanding of the socio-historical context of this play, we propose a short introduction to the 19th century, in Portugal. We also present and analyse some important para-textual pieces of information that accompany the translation made by Maxime Formont

Catherine Kerbrat-Orecchioni, dir., S’adresser à autrui. Les formes nominales d’adresse en français

Sous la direction de Catherine Kerbrat-Orecchioni, le volume S’adresser à autrui. Les formes nominales d’adresse en français, paru en 2010, réunit douze contributions, y compris l’introduction (pp. 7-30) et le bilan (pp. 335-372) qui sont signés par la coordinatrice elle-même. Le volume a été réalisé sous l’égide de l’université de Savoie dans le cadre du laboratoire Langages, littératures, sociétés. Catherine Kerbrat-Orecchioni est professeure émérite à l’université Lumière Lyon 2 et membre ..

Terahertz single pixel imaging based on a Nipkow disk

We describe a terahertz single pixel imaging system based on a Nipkow disk. Nipkow disks have been used for fast scanning imaging systems since the first experimental television was invented in 1926. In our work, a Nipkow disk with 24 scanning lines was used to provide an axial resolution of 2 mm/pixel. We also show that by implementing a microscanning technique the axial resolution can be further improved to 0.5 mm/pixel. Imaging of several objects was demonstrated to show that this simple scanning system is promising for fast and/or real time terahertz imaging applications

A monolithic resonant terahertz sensor element comprising a metamaterial absorber and micro-bolometer

In this article a monolithic resonant terahertz sensor element with a noise equivalent power superior to that of typical commercial room temperature single pixel terahertz detectors and capable of close to real time read-out rates is presented. The detector is constructed via the integration of a metamaterial absorber and a micro-bolometer sensor. An absorption magnitude of 57% at 2.5 THz, a minimum NEP of inline image and a thermal time constant of 68 ms for the sensor are measured. As a demonstration of detector capability, it is employed in a practical Nipkow terahertz imaging system. The monolithic resonant terahertz detector is readily scaled to focal plane array formats by adding standard read-out and addressing circuitry enabling compact, low-cost terahertz imaging

Strong terahertz emission from electromagnetic diffusion near cutoff in plasma

Anew mechanism for electromagnetic emission in the terahertz (THz) frequency regime from laser-plasma interactions is described. A localized and long-lasting transverse current is produced by two counter-propagating short laser pulses in weakly magnetized plasma. We show that the electromagnetic wave radiating from this current source, even though its frequency is close to cut-off of the ambient plasma, grows and diffuses towards the plasma-vacuum boundary, emitting a strong monochromatic THz wave. With driving laser pulses of moderate power, the THz wave has a field strength of tens of MV m(-1), a frequency of a few THz and a quasi-continuous power that exceeds all previous monochromatic THz sources. The novelty of the mechanism lies in a diffusing electromagnetic wave close to cut-off, which is modelled by a continuously driven complex diffusion equationopen

High-contrast coherent terahertz imaging of porcine tissue via swept-frequency feedback interferometry

There is considerable interest in the interrogation of biological tissue at terahertz (THz) frequencies, largely due to the contrast in the optical properties of different biological tissues which occur in this electro-magnetic radiation band. Of particular interest are THz biomedical images, which have the potential to highlight different information than those acquired in other frequency bands, thereby providing an augmented picture of biological structures. In this work, we demonstrate the feasibility of an interferometric biological imaging technique using a THz quantum cascade laser (QCL) operating at 2.59 THz to perform coherent imaging of porcine tissue samples. We show the potential of this new THz biomedical imaging technique for in vivo studies, by virtue of its reflection geometry and useful tissue penetration depth enabled by the large THz powers emitted by the quantum cascade laser used in this work. The observed clustering of interferometric tissue signatures opens a pathway towards automatic techniques for the discrimination of healthy tissue types for the study of normal physiology and possible therapeutic approaches

Terahertz Josephson plasma waves in layered superconductors: spectrum, generation, nonlinear, and quantum phenomena

The recent growing interest in terahertz (THz) and sub-THz science and technology is due to its many important applications in physics, astronomy, chemistry, biology, and medicine. We review the problem of linear and non-linear THz and sub-THz Josephson plasma waves in layered superconductors and their excitations produced by moving Josephson vortices. We start by discussing the coupled sine-Gordon equations for the gauge-invariant phase difference of the order parameter in the junctions, taking into account the effect of breaking the charge neutrality, and deriving the spectrum of Josephson plasma waves. We also review surface and waveguide Josephson plasma waves. We review the propagation of weakly nonlinear Josephson plasma waves below the plasma frequency, which is very unusual for plasma-like excitations. In close analogy to nonlinear optics, these waves exhibit numerous remarkable features, including a self-focusing effect, and the pumping of weaker waves by a stronger one. We also present quantum effects in layered superconductors, specifically, the problem of quantum tunnelling of fluxons through stacks of Josephson junctions. We discuss the Cherenkov and transition radiations of the Josephson plasma waves produced by moving Josephson vortices. We also discuss the problem of coherent radiation (superradiance) of the THz waves by exciting uniform Josephson oscillations. The effects reviewed here could be potentially useful for sub-THz and THz emitters, filters, and detectors

A Nipkow disk integrated with Fresnel lenses for terahertz single pixel imaging

We present a novel Nipkow disk design for terahertz (THz) single pixel imaging applications. A 100 mm high resistivity (ρ≈3k-10k Ω·cm) silicon wafer was used for the disk on which a spiral array of twelve 16-level binary Fresnel lenses were fabricated using photolithography and a dry-etch process. The implementation of Fresnel lenses on the Nipkow disk increases the THz signal transmission compared to the conventional pinhole-based Nipkow disk by more than 12 times thus a THz source with lower power or a THz detector with lower detectivity can be used. Due to the focusing capability of the lenses, a pixel resolution better than 0.5 mm is in principle achievable. To demonstrate the concept, a single pixel imaging system operating at 2.52 THz is described