Concept

Atmosphère de Mars

Publications associées (72)

Quantification of rapid temperature change during DO event 12 and phasing with methane inferred from air isotopic measurements

We summarize (1) knowledge about the global pre-industrial cycle of CO2 and CH4, and (2) recent reconstructions of the concentration of CO2 and CH4 in the atmosphere (CO2atm and CH4atm) based on ice cores drilled in Antarctica and Greenland. We discuss cri ...

Elsevier BV2004

Measurement of quartz particles by means of an atomic force microscope for planetary exploration

Nico de Rooij, Terunobu Akiyama, Sebastian Gautsch

Within the last 2 years our consortium has developed, built and tested an atomic force microscope for planetary science applications, in particular for the study of Martian dust and soil. An array of eight cantilevers and tips provides redundancy in case o ...

2002

Aqueous alteration in the Northwest Africa 817 (NWA 817) Martian meteorite

Philippe Gillet

Samples of a new Martian meteorite of the nakhlite family (NWA 817) contain traces of an iron-rich alteration product. Textural arguments indicate that this alteration product has been formed on the parent body of the meteorite (Mars). The chemical composi ...

2002

Structured Au/FeOx/C catalysts for low temperature CO oxidation

Albert Renken, Philippe Buffat, Lioubov Kiwi, Elena Suvorova Buffat

Innovative structured catalysts based on nanoparticles of gold supported on activated carbon fibers (ACF) in the form of woven fabrics are presented for low-temperature CO oxidation. Gold was deposited by adsorption from aqueous solution of ethylenediamine ...

2002

Physical properties of liquid Fe alloys at high pressure and their bearings on the nature of metallic planetary cores

Philippe Gillet

[1] Sulfur and silicon are among the expected alloying light elements in planetary liquid iron cores. Structural properties of Fe-27 wt % S and Fe-17 wt % Si liquid alloys at high pressure and high temperature (0-5 GPa/1400-2300 K) are measured by synchrot ...

2002

Novel membrane reactor with filamentous catalytic bed for propane dehydrogenation

Albert Renken, Lioubov Kiwi, Olivier Wolfrath

A novel membrane reactor with two zones containing structured filamentous catalytic beds was proposed for propane nonoxidative dehydrogenation. Catalytic filaments with a similar to7 similar to mum diameter consist of silica cove-red by porous alumina with ...

2001

Surface modification of polyester films by RF plasma

Christoph Hollenstein, John Christopher Plummer, Nicolas Xanthopoulos

Plasma treatment of PET films was carried out under argon, followed by exposure to an oxygen atmosphere. The films underwent considerable changes in surface composition and morphology, as demonstrated by contact angle measurements, FTIR-ATR, AFM, and XPS. ...

2000

K-40-Ar-40 constraints on recycling continental crust into the mantle

Philippe Gillet

Extraction of potassium into magmas and outgassing of argon during melting constrain the relative amounts of potassium in the crust with respect to those of argon in the atmosphere. No more than 30% of the modern mass of the continents was subducted back i ...

2000

Possible self-organizing dynamics for land-atmosphere interaction

Andrea Rinaldo, Paolo d'Odorico

Land-atmosphere interactions play a central role in the mesoscale evolution of hydrologic fields like rainfall and soil moisture. A water balance model, capturing the essence of such interaction and driven by mesoscale and synoptic processes, was found to ...

1998

Silicon oxide thin films obtained by Ar+ bombardment of Si(100) in oxygen atmosphere at room temperature

Giorgio Margaritondo

We report the formation of silicon oxide thin films obtained at room temperature by Ar+ bombardment of Si(100) wafers in partial oxygen atmosphere, The ion bombardment was done in the energy range E(b) - 100-1000 eV, with Ar partial pressure P-Ar = 1 x 10( ...

1996

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