Search results for " ENVIRONMENT"
showing 10 items of 19900 documents
Stochastic gravito-inertial modes discovered by CoRoT in the hot Be star HD 51452
2012
International audience; Context. Be stars are rapidly rotating stars with a circumstellar decretion disk. They usually undergo pressure and/or gravity pulsation modes excited by the κ-mechanism, i.e. an effect of the opacity of iron-peak elements in the envelope of the star. In the Milky Way, p-modes are observed in stars that are hotter than or equal to the B3 spectral type, while g-modes are observed at the B2 spectral type and cooler. Aims. We observed a B0IVe star, HD 51452, with the high-precision, high-cadence photometric CoRoT satellite and high-resolution, ground-based HARPS and SOPHIE spectrographs to study its pulsations in great detail. We also used the lower resolution spectra a…
Chemical Cartography with APOGEE: Multi-element Abundance Ratios
2019
We map the trends of elemental abundance ratios across the Galactic disk, spanning R = 3-15 kpc and midplane distance |Z|= 0-2 kpc, for 15 elements in a sample of 20,485 stars measured by the SDSS/APOGEE survey (O, Na, Mg, Al, Si, P, S, K, Ca, V, Cr, Mn, Fe, Co, Ni). Adopting Mg rather than Fe as our reference element, and separating stars into two populations based on [Fe/Mg], we find that the median trends of [X/Mg] vs. [Mg/H] in each population are nearly independent of location in the Galaxy. The full multi-element cartography can be summarized by combining these nearly universal median sequences with our measured metallicity distribution functions and the relative proportions of the lo…
The Gaia-ESO Survey: impact of extra mixing on C and N abundances of giant stars
2018
The GES survey using FLAMES at the VLT has obtained high-resolution UVES spectra for a large number of giant stars, allowing a determination of the abundances of the key chemical elements C and N at their surface. The surface abundances of these chemical species are well-known to change in stars during their evolution on the red giant branch after the first dredge-up episod, as a result of extra-mixing phenomena. We investigate the effects of thermohaline mixing on C and N abundances using the first comparison between the GES [C/N] determinations with simulations of the observed fields using a model of stellar population synthesis. We explore the effects of thermohaline mixing on the chemic…
IEL.21-22-Unit 3. The application of International Environmental Law
2022
International Environmental Law. Unit 3. The Application of International Environmental Law. Powerpoint of the Academic course 2021-2022. 15. UNIT 3.-THE APPLICATION OF INTERNATIONAL ENVIRONMENTAL LAW. 1. General aspects: control procedures and bodies - 2. International liability in international environmental law: (a) general aspects; (b) liability for unlawful acts and international environmental crime; (c) liability of States for environmental damage resulting from acts not prohibited by international law - 3. Peaceful settlement of international disputes concerning the protection of the environment.
Regulating role of lumbricid macrofauna in Atrazine biodegradation in temperate cropped soil.
2004
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Interactions biotiques entre macrofaune lombricienne et les communautés microbiennes, indigènes et bioaugmentées, dégradant l'atrazine en sol tempéré.
2004
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Biodégradation de l'atrazine en sols tempérés : rôle régulateur d'un modèle d'interaction biotique macrofaune/bactérie.
2004
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¿Cómo motivar al alumnado de la eso a través del área de música? La formación corporal como recurso didáctico
2018
espanolSe presenta una propuesta didactica que pretende ofrecer, al alumnado de ensenanza secundaria obligatoria, una educacion y una formacion corporal basicas, a traves del area de musica. La finalidad es realizar una investigacion que nos permita conocer si, a partir del area de musica, se puede favorecer la actitud, el interes y la motivacion de los alumnos de este nivel educativo por esta asignatura, contribuyendo al mismo tiempo a su desarrollo integral. Esta propuesta, tambien permite ofrecer a los alumnos de la ESO la oportunidad de aprender y experimentar con tecnicas especificas. catalaEs presenta una proposta didactica que preten oferir, a l’alumnat d’ensenyament secundari obliga…
Les traces de pas d'amphibiens, de dinosaures et autres reptiles du Mésozoïque français: inventaire et interprétations.
2007
Since the 19th century, thousands of footprints were observed in the geological series of the French Mesozoic. All are located in the Triassic and Jurassic. After a promising beginning, in France, it is only a few papers which will be published in the first half 20th century, unlike the USA and of others countries of Western Europe. One ought to wait about 1950 for a revival and now they are nearly 200 papers which were devoted to the ichnofossils. The literature abundance and the renewed interest of the naturalists for the palichnologic studies decided to us to write a synthesis work. This one begins with a stratigraphic inventory in which, localisation, age and paleontological contents of…
Assemblage des communautés adventices: apports de l'approche fonctionnelle
2014
National audience