1,356,499 research outputs found
RF or THz signals generated from DC biased multimode lasers
No full textAlthough self pulsating (SP) lasers are DC biased, they feature a modulation of the output power. For the results presented in this paper, the SP frequency corresponds to the frequency spacing between longitudinal modes or its second harmonic. The performances of both a 40 GHz self pulsating distributed Bragg reflector laser and of a 660 GHz slotted laser are presented. For the first laser, the radio frequency (RF) signal was analysed on electrical spectrum analyser and its linewidth was smaller that the sum of the main optical modes, proving a passive modelocking of the mode phases. For the slotted laser, a bolometer interfaced to a FT IR spectrometer is used for the terahertz (THz) detection. A signal 10 times larger than the noise level was measured with this set up. Both lasers have demonstrated to be an easy solution to produce RF or THz signal generator
Camille Landais: the gender gap stems from the unequal allocation of childcare work between partners
No full textHaving children can slow down career progression significantly for women, but not for men. LSE Professor Camille Landais studied this difference in outcomes and labelled it the “child penalty”. He sat down for a chat with Anna Bevan (LSE Audio & Film) for the LSE IQ podcast. They discussed the dynamics behind the child penalty, what policymakers can do, whether outcomes are different for homosexual couples and how Portugal managed to have high female employment rates
A propos de l'« Ivoire Barberini »
No full textLandais Hubert. A propos de l'« Ivoire Barberini ». In: Bulletin Monumental, tome 115, n°2, année 1957. pp. 148-149
Plan de sauvegarde du poney landais
No full textLa race des poneys landais qui ne comptait plus qu'une centaine d'individus en 1970, était menacée de disparition. Nous présentons le plan de sauvegarde dont elle a fait l'objet à cette époque, plan établi grâce à la volonté d'éleveurs passionnés sans schéma scientifique préétabli. Un bilan actuel de l'élevage des poneys landais nous montre que la race n'est pas encore sauvée. Son avenir passe par une évolution et un soutien des organismes publics.MAISONS-ALFORT-Ecole Vétérin (940462302) / SudocSudocFranceF
Un vitrail ou un bas-relief historié de l'abbaye de la Colombe ? A propos d'une étude récente
No full textLandais Hubert. Un vitrail ou un bas-relief historié de l'abbaye de la Colombe ? A propos d'une étude récente. In: Bulletin Monumental, tome 115, n°1, année 1957. pp. 43-46
Le gisement du Landais ( commune de Bosset, Dordogne )
No full textLe Landais, an open-air site with a little deposit of lithic material, seems to be a workshop with a final débitage of flint coming from the surrounding detrital sediments. It is probably Magdalenian.Le gisement de plein air du Landais est un petit dépôt de matériel lithique paraissant correspondre à un atelier de confection d'outil et de débitage ultime de silex récoltés dans les sédiments détritiques tertiaires des environs. Il s'agit vraisemblablement de Magdalénien.Gaussen Jean, Merlaud Bernard. Le gisement du Landais ( commune de Bosset, Dordogne ). In: Paléo, n°8,1996. pp. 323-334
Investigation of in-situ parameter control in novel semiconductor optical amplifiers
No full textFibre optic networks form the backbone of modern communications systems. As demand for ever increasing bandwidth continues to grow, technologies that enable the
expansion of optical networks will be the key to future development. The semiconductor optical amplifier (SOA) is a technology that may be crucial in future optical networks, as a low cost in-line amplifier or as a functional element. As fibre networks extend closer to the end user, economical ways of improving the reach of these networks are
important. SOAs are small, relatively inexpensive and can be readily integrated in photonic circuits. Problems persist with the development of SOAs, however, in the form
of a relatively high noise figure and low saturation output power, which limits their use in many circumstances. The aim of this thesis is to outline a concept for control of these parameters such that the SOA can achieve the performance required. The concept relies on the control of the carrier density distribution in the SOA. The basic characteristics of the SOA and how they are affected by changes in the carrier density are studied. The performance of the SOA in linear and high power transmission of CW and pulsed signals is determined. Finally, the wavelength conversion characteristics of the SOA are outlined. The role of the carrier density control in shaping all of these characteristics will be explained
Intérieur Landais
No full textHand colored postcard. Front: view depicting interior of a typical Gascon house with fireplace, mantel, exposed ceiling joists, compressed earth floors, and family. Above a basket of hay, cows look in through a feeding window presumably from a lean-to or appentice structure on the outside of the house. Text along bottom of card reads, "Intréieur Landais - (lou Pâchedeüy)." Back: divided back, unused.A typical Gascon home, with exposed wooden joists, compressed earth floor, lean-to and hay loft.Congregation of the Mission (Vincentians; Lazarists)Color postcard; 3.5 x 5.5 in.; 8.89 x 13.97 cm
Dehydrogenative Silylation - Marie Curie SILYCAT
No full textThe datasheet contains spectroscopic data (1H, 13C, 29Si NMR, infra-red and high-resolution mass spectrometry) of compounds prepared for the following publication :
S. Pramanik, A. Fernandes, V. Liautard, M. Pucheault, F. Robert, Y. Landais, Chem. Eur. J. 2019, 25, 728-732.
DOI: 10.1002/chem.201803989
A copy of the paper is available in open access at https://hal.archives-ouvertes.fr/ :
〈hal-02012175, v1〉</p
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