26 research outputs found

    Port-en-Bessin-Huppain, Commes – Le Mont Castel

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    Depuis quatre ans, le site du Mont Castel fait l’objet de fouilles archéologiques programmées à la fin de l’été. En 2018 la fouille a concerné l’étude d’un vaste horreum et l’étude des abords du rempart, à proximité de l’habitat de l’âge du Bronze. C’est dans ce secteur qu’a été mis au jour, en début de campagne, un dépôt du Bronze final 3a comportant une trentaine d’objets en bronze dans un vase en céramique. Ce dépôt est une découverte de premier plan au niveau national puisque intègre et e..

    Port-en-Bessin-Huppain – Le Mont-Castel

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    Le Mont-Castel est un plateau côtier d’une vingtaine d’hectares qui domine la commune de Port-en-Bessin à une dizaine de kilomètres à l’ouest de la capitale de cité gallo-romaine des Baïocasses Bayeux/Augustodurum. Il s’intègre au fond d’une plaine d’environ 400 ha entourée d’une couronne de reliefs bien marqués sur lesquels au moins deux autres sites fortifiés ont déjà été repérés : le Mont-Cauvin, sur la commune d’Étreham (Bronze final IIIb, prospections aériennes G. Hulin et S. Normant 200..

    Port-en-Bessin-Huppain – Le Mont Castel

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    Depuis trois ans, le site du Mont Castel fait l’objet de fouilles archéologiques programmées à la fin de l’été. Cette année, c’est principalement l’occupation de la fin de l’indépendance gauloise qui a fait l’objet d’un travail de fond. Il est désormais possible de dresser dans ces grandes lignes les modalités d’occupation du site. Nous rappellerons toutefois, avant de présenter l’occupation de La Tène D2b, que le site est fortifié et occupé dès le Bronze final IIIa et fait l’objet durant le ..

    The Front-End of the NOEMA Interferometer

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    The IRAM Plateau de Bure Interferometer (PdBI) is being upgraded to a new powerful millimeter-wave radio astronomy facility called the NOrthern Extended Millimeter Array (NOEMA) which will double the number of the 15-m diameter antennas from six to 12. All antennas will be equipped with a new generation of dual-polarization Front-End covering the 72-373-GHz frequency range with four independent receivers integrated into a single cryostat. All receivers utilize sideband separating (2SB) superconductor-insulator-superconductor (SIS) mixers, each of which delivers two ~7.7-GHz-wide intermediate frequency (IF) outputs per polarization channel, thus increasing the total IF bandwidth which can be processed with a single setting of the interferometer from 8 GHz (2 × 4 GHz delivered by the existing PdBI Front-End) to ~31 GHz (4 × 7.7 GHz delivered by the NOEMA Front-End). The first of the new NOEMA antennas (Ant. 7) has recently been completed and the first NOEMA Front-End successfully developed and installed in it. For the coming years, our goal is to upgrade all of the Front-Ends currently installed on the six existing PdBI antennas to the new NOEMA standard and to build six additional ones (plus one spare) for the new NOEMA antennas. In this paper, we describe the design, fabrication, and assembly of the Front-End we have developed for NOEMA Antenna 7. The instrument has state-of-the-art performance and sets a new standard in the post-ALMA generation technology

    Fabrication of Oriented n‐Type Thermoelectric Polymers by Polarity Switching in a DPP‐Based Donor–Acceptor Copolymer Doped with FeCl 3

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    International audiencen‐Type‐doped polymers are key elements to fabricate all‐polymer thermoelectric generators but they are challenging to produce. Herein, a new strategy is proposed, which is based on polarity switching upon doping of a donor–acceptor (D–A) copolymer based on diketopyrrolopyrrol (DPP) and quintethiophene (5T) with FeCl3. Polarity switching from p‐type to n‐type is observed upon increasing the doping concentration of FeCl3. An analysis based on nonmonotonic density of states is proposed, which accounts for the main experimental trends and demonstrates that the polarity switch is governed by the electronic band filling that is determined by the dopant concentration. The influence of the curvature of the density of states is in addition discussed and a complete description of the doping induced transport regimes is proposed. This polarity switching depends on the molecular weight Mn of the polymer and shifts to higher FeCl3 concentrations with increasing Mn. This behavior is attributed to the change of the width of the density of states with Mn. The combination of polarity switching and alignment is a means to produce n‐type‐like oriented and conducting polymers with enhanced power factors up to 10 µW K−2 m−1 along the chain direction
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