199 research outputs found
Des combats, des figures. Au fil du Maitron en Bretagne.
This paper deals with the story of Maitron in Britanny.Le Dictionnaire Biographique du Mouvement Ouvrier et du Mouvement Social (DBMOMS) est plus connu sous le nom de Maitron, en référence à l'un des fondateurs de l'histoire du mouvement ouvrier en France. Ce dictionnaire à double support, papier et CD ROM, qui rassemble des notices biographiques des militants des syndicats et des partis investis dans le mouvement social, au sens large du terme, connaßt une renaissance en Bretagne
Les mondes dâAugustin Hamon
Intellectuel Ă©clectique Ă revisiter, Augustin Hamon Ă©merge Ă la fin du XIXe siĂšcle, insĂ©rĂ© dans les cercles anarchistes parisiens. Traducteur français de Shaw, figurant parmi les fondateurs de la psychologie sociale française, ce bĂątisseur de la SFIO en Bretagne multiplie les formes dâengagements. Ainsi, explorer « les mondes dâAugustin Hamon », câest analyser dâune position intellectuelle originale dâouverture sur le monde sâappuyant sur un rĂ©seau Ă©toffĂ© de relations Ă lâĂ©chelle europĂ©enne. Dans ses Ă©crits, le publiciste dĂ©voile des reprĂ©sentations du monde vues du TrĂ©gor, visions pour le moins atypiques dĂ©fendant lâexpĂ©rience soviĂ©tique et dĂ©composant le capitalisme contrĂŽlĂ© par les « deux cents familles ». La passion des questions internationales de ce journaliste socialiste prolixe, tĂ©moigne dâune perception moderne de la premiĂšre guerre mondiale, pensĂ©e prolongĂ©e dans lâaction par un engagement antifasciste prĂ©coce, aux marges de la SFIO.Augustin Hamon is an eclectic intellectual to revisit, who raised at the end of the XIXth Century when he was settled in anarchist networks in Paris. French translator of Shaw, appearing among the founders of the French social psychology, this builder of the SFIO in Brittany multiplies the forms of commitments. Thus, to investigate âAugustin Hamonâs worldsâ, it is to analyze an original intellectual position, wide-opened on the world, leaning on a network of relations at the European scale. In his papers, he reveals representations of the world, seen from the TrĂ©gor where he used to live, at least atypical visions defending the Soviet Union experience or trying to show that the capitalist system was controled by two hundred very linked families. The passion of the international questions of this prolix socialist journalist, testifies of a modern perception of WWI. His thought was prolonged in the action by an early antifascist commitment, in the margins of the French Socialist Party (SFIO)
Ondes hydrothermales non-linéaires dans un disque et un anneau
URL: http://www-spht.cea.fr/articles/S98/109Nous nous intéressons à la convection thermocapillaire, produite par l'imposition d'un gradient {\it horizontal} de température sur une mince couche de fluide avec surface libre. En géométrie bidimensionnelle nous observons deux modes différents en compétition, tandis qu'en géométrie bidimensionnelle avec conditions limites périodiques, nous étudions la transition à la turbulence d'une onde propagative homogÚne
Etude de filtres millimétriques accordables en technologie microfluidique
National audienceCet article présente les travaux initiés au Lab-STICC et au LAAS sur la conception de dispositifs passifs hyperfréquences accordables sur la basse d'une approche microfluidique. L'idée est d'utiliser des micros canaux dans lesquels circulent des fluides. Ces fluides, diélectriques dans un premier temps, sont utilisés pour modifier la permittivité effective d'un substrat sur lequel est réalisée une structure planaire. La perturbation apportée par le fluide diélectrique va ainsi modifier la fréquence de travail du dispositif. En premiÚre approche, des stubs quart d'onde et des filtres passe-bande à stubs sont examinés
Nonlinear dynamics of waves and modulated waves in 1D thermocapillary flows. I: General presentation and periodic solutions
We present experimental results on hydrothermal traveling-waves dynamics in
long and narrow 1D channels. The onset of primary traveling-wave patterns is
briefly presented for different fluid heights and for annular or bounded
channels, i.e., within periodic or non-periodic boundary conditions. For
periodic boundary conditions, by increasing the control parameter or changing
the discrete mean-wavenumber of the waves, we produce modulated waves patterns.
These patterns range from stable periodic phase-solutions, due to supercritical
Eckhaus instability, to spatio-temporal defect-chaos involving traveling holes
and/or counter-propagating-waves competition, i.e., traveling sources and
sinks. The transition from non-linearly saturated Eckhaus modulations to
transient pattern-breaks by traveling holes and spatio-temporal defects is
documented. Our observations are presented in the framework of coupled complex
Ginzburg-Landau equations with additional fourth and fifth order terms which
account for the reflection symmetry breaking at high wave-amplitude far from
onset. The second part of this paper (nlin.PS/0208030) extends this study to
spatially non-periodic patterns observed in both annular and bounded channel.Comment: 45 pages, 21 figures (elsart.cls + AMS extensions). Accepted in
Physica D. See also companion paper "Nonlinear dynamics of waves and
modulated waves in 1D thermocapillary flows. II: Convective/absolute
transitions" (nlin.PS/0208030). A version with high resolution figures is
available on N.G. web pag
Des produits issus dâanimaux terrestres recevant une alimentation enrichie en DHA algal peuvent contribuer Ă la couverture des besoins en cet acide gras essentiel
Ce travail prĂ©sente une mĂ©thode permettant dâaugmenter la consommation en DHA de la population sans accroitre le prĂ©lĂšvement halieutique, grĂące Ă la production de produits provenant dâanimaux terrestres nourris avec des aliments contenant du DHA provenant de microalgues de culture et dâALA provenant du lin extrudĂ©. AprĂšs une identification des espĂšces fixant le DHA en quantitĂ© importante (pondeuse, lapins, poulet de chair), des essais rĂ©alisĂ©s sur ces animaux (21 sur pondeuses, 9 sur lapins, 6 sur poulets de chair) ont permis de dĂ©terminer les conditions dâenrichissement en DHA ainsi que les teneurs en cet acide gras que lâon peut atteindre dans ces produits. Ainsi, avec cette alimentation, le contenu en DHA des Ćufs est de 200 mg / 100 grammes soit 3,5 fois plus quâun Ćuf standard; pour le lapin (par exemple, la gigolette), cette valeur est Ă©galement de 200 mg / 100 grammes soit 10 fois plus quâune viande de lapin standard; et pour le poulet de chair (par exemple, le blanc) 83 mg / 100 grammes soit 4 fois plus quâune viande de poulet de chair standard. La plupart de ces produits peuvent allĂ©guer « Riche en omĂ©ga 3 » ou « Source dâomĂ©ga 3 ». Ces diffĂ©rents aliments peuvent ĂȘtre associĂ©s dans des menus permettant dâatteindre les recommandations dâingestion de DHA sans augmenter la consommation de poisson, amĂ©liorant ainsi la santĂ© de la population et celle de la planĂšte dans le respect des habitudes alimentaires.
Altimetry for the future: Building on 25 years of progress
In 2018 we celebrated 25 years of development of radar altimetry, and the progress achieved by this methodology in the fields of global and coastal oceanography, hydrology, geodesy and cryospheric sciences. Many symbolic major events have celebrated these developments, e.g., in Venice, Italy, the 15th (2006) and 20th (2012) years of progress and more recently, in 2018, in Ponta Delgada, Portugal, 25 Years of Progress in Radar Altimetry. On this latter occasion it was decided to collect contributions of scientists, engineers and managers involved in the worldwide altimetry community to depict the state of altimetry and propose recommendations for the altimetry of the future. This paper summarizes contributions and recommendations that were collected and provides guidance for future mission design, research activities, and sustainable operational radar altimetry data exploitation. Recommendations provided are fundamental for optimizing further scientific and operational advances of oceanographic observations by altimetry, including requirements for spatial and temporal resolution of altimetric measurements, their accuracy and continuity. There are also new challenges and new openings mentioned in the paper that are particularly crucial for observations at higher latitudes, for coastal oceanography, for cryospheric studies and for hydrology. The paper starts with a general introduction followed by a section on Earth System Science including Ocean Dynamics, Sea Level, the Coastal Ocean, Hydrology, the Cryosphere and Polar Oceans and the ââGreenâ Ocean, extending the frontier from biogeochemistry to marine ecology. Applications are described in a subsequent section, which covers Operational Oceanography, Weather, Hurricane Wave and Wind Forecasting, Climate projection. Instrumentsâ development and satellite missionsâ evolutions are described in a fourth section. A fifth section covers the key observations that altimeters provide and their potential complements, from other Earth observation measurements to in situ data. Section 6 identifies the data and methods and provides some accuracy and resolution requirements for the wet tropospheric correction, the orbit and other geodetic requirements, the Mean Sea Surface, Geoid and Mean Dynamic Topography, Calibration and Validation, data accuracy, data access and handling (including the DUACS system). Section 7 brings a transversal view on scales, integration, artificial intelligence, and capacity building (education and training). Section 8 reviews the programmatic issues followed by a conclusion
Altimetry for the future: building on 25 years of progress
In 2018 we celebrated 25âŻyears of development of radar altimetry, and the progress achieved by this methodology in the fields of global and coastal oceanography, hydrology, geodesy and cryospheric sciences. Many symbolic major events have celebrated these developments, e.g., in Venice, Italy, the 15th (2006) and 20th (2012) years of progress and more recently, in 2018, in Ponta Delgada, Portugal, 25 Years of Progress in Radar Altimetry. On this latter occasion it was decided to collect contributions of scientists, engineers and managers involved in the worldwide altimetry community to depict the state of altimetry and propose recommendations for the altimetry of the future. This paper summarizes contributions and recommendations that were collected and provides guidance for future mission design, research activities, and sustainable operational radar altimetry data exploitation. Recommendations provided are fundamental for optimizing further scientific and operational advances of oceanographic observations by altimetry, including requirements for spatial and temporal resolution of altimetric measurements, their accuracy and continuity. There are also new challenges and new openings mentioned in the paper that are particularly crucial for observations at higher latitudes, for coastal oceanography, for cryospheric studies and for hydrology.
The paper starts with a general introduction followed by a section on Earth System Science including Ocean Dynamics, Sea Level, the Coastal Ocean, Hydrology, the Cryosphere and Polar Oceans and the âGreenâ Ocean, extending the frontier from biogeochemistry to marine ecology. Applications are described in a subsequent section, which covers Operational Oceanography, Weather, Hurricane Wave and Wind Forecasting, Climate projection. Instrumentsâ development and satellite missionsâ evolutions are described in a fourth section. A fifth section covers the key observations that altimeters provide and their potential complements, from other Earth observation measurements to in situ data. Section 6 identifies the data and methods and provides some accuracy and resolution requirements for the wet tropospheric correction, the orbit and other geodetic requirements, the Mean Sea Surface, Geoid and Mean Dynamic Topography, Calibration and Validation, data accuracy, data access and handling (including the DUACS system). Section 7 brings a transversal view on scales, integration, artificial intelligence, and capacity building (education and training). Section 8 reviews the programmatic issues followed by a conclusion
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