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Hennion F. & Couderc H. (1992). Cytogenetical study of Pringlea antiscorbutica R.Br.and Ranunculus moseleyi Hook.f.from the Kerguelen Islands. Antarct. Sci., 4(1), 57–58.
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Pourchet M. & Pinglot J.F. (1994). Radioactivity of Arctic and Antarctic snow. Analusis magazine, 7, 29–30.
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Mougeot F., Genevois F. & Bretagnolle V. (1998). Predation on burrowing petrels by the brown skua at Mayes islands, Kerguelen. J. Zool. (Lond.), 244, 429–438.
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Mihalopoulos N., Putaud J.P. & Nguyen B.C. (1993). Seasonal variatrion of methanesulfonic acid in precipitation at Amsterdam Island in the Southern Indian Ocean. Atmospheric environment, 27A, 2069–2073.
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Van Der Loo W., Bousses P., Arthur C.P. & Chapuis J. (1996). Compensatory Aspects of Allele Diversity at Immunoglobulin Loci: Gene Correlations in Rabbit Populations devoid of Light Chain Diversity (Oryctolagus cuniculus L.; Kerguelen Islands). Genetics, 144, 1181–1194.
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Touaty M. (1999). Développement instrumental de la mesure en continu des hydrocarbures légers par chromatographie en phase gazeuse. Doctoral thesis, , .
Abstract: Thèse de Doctorat, Université de Paris VII
Les hydrocarbures non méthaniques (NMHC) légers de deux à six atomes de carbone (C2-C6), en raison de leur réactivité, sont essentiels dans les processus chimiques troposphériques qui contrôlent le bilan d'ozone. La diversité de leurs durées de vie apporte également des informations quantitatives sur les processus dynamiques atmosphériques. L'implication des NMHC ne se limite pas aux régions polluées, mais par un transport à grande échelle, peut également s'étendre aux régions éloignées de leurs sources. Ainsi l'intérêt de la mesure des hydrocarbures concerne tous les compartiments atmosphériques, et repose sur une très bonne spéciation de ces espèces. La méthode de mesure la plus utilisée jusqu'aux années 1990 afin d'effectuer la spéciation des NMHC puis leur quantification, a été basée sur les prélèvements en flacons en acier avec une analyse différée par chromatographie en phase gazeuse (CPG). Cette méthode nous a permis dans le cadre de ce travail d'établir des facteurs d'émission d'hydrocarbures et de monoxyde de carbone de la source automobile (tunnel de Thiais) et d'étudier les variations saisonnières des NMHC dans une station de bruit de fond (Ile Amsterdam). Les limites de ce protocole sont évaluées lors d'une étude de la stabilité des hydrocarbures stockés dans deux types de flacons en acier et en verre. En conséquence, une analyse en continu «in situ» est nécessaire afin de mieux établir la variabilité spatiale des NMHC et notamment leurs distributions verticales et temporelles. La mise au point et les performances d'un instrument de mesure en continu des hydrocarbures légers (C2-C6) par CPG sont présentées ici. Les mesures préliminaires au sol ou lors d'essais aéroportés sont évaluées et permettent de définir de futures optimisations.
Programme: 146
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Gung Yuancheng, Hsu Ya-Ting, Chiao Ling-Yun, Obayashi Masayuki, . (2009). Multiscale waveform tomography with two-step model parameterization
. J. Geophys. Res., 114(B11), B11301–.
Abstract: In geophysical tomography, a proper model parameterization scheme for forward modeling is not necessarily a suitable one for the inversion stage, and vice versa. To take full advantage of the merits of parameterization in both stages, we propose a two-step model parameterization approach, in which different model bases for forward computation and inversion are adopted and the basis change is achieved by applying a spatial projection directly to the sensitivity matrix. We demonstrate this approach through an experimental study of waveform tomography for the Pacific upper mantle shear wave structure using first-orbit long-period Rayleigh waves. In the forward modeling, a normal-mode-based nonlinear asymptotic coupling theory is used for the computation of the synthetics and sensitivity matrix, and the model is parameterized in terms of spherical harmonics which provide efficient analytical solutions for path integrals in the forward modeling. Prior to the inversion, the model basis of the sensitivity matrix is transformed to local functions within the study region. After mapping, only local bases around the data sampling path receive effective sensitivities. Accordingly, the computation cost in the inversion is significantly reduced. Furthermore, the two-step model parameterization also adds flexibility to the inversion schemes. In particular, a wavelet-based multiscale inversion is implemented, and its results are compared to simple damping solutions. The general concept and applications of the two-step model parameterization are not restricted to the forwarding modeling technique or model parameterization schemes employed in this experimental study. This approach benefits any inverse problems wherever transformation of model bases helps to better constrain the results.
Keywords: multiscale tomography, two-step model parameterization, nonlinear asymptotic coupling theory, 3260 Mathematical Geophysics: Inverse theory, 7270 Seismology: Tomography, 7255 Seismology: Surface waves and free oscillations,
Programme: 133
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Chessa J.P., Peterscu I., Bentahir M., Van Beeumen J. & Gerday C. (2000). Purification, physico-chemical characterization and sequense of a heat labile alkaline metalloprotease isolated from a psychrophilic Pseudomonas species. Biochim. Biophys. Acta, 1479, 265–274.
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Charrassin J.B., Bost A., Pütz K., Lage J., Dahier T. & Le Maho Y. (1999). Changes in depth utilization in relation to the breeding stage: a case study with the king penguin aptendytes patagonicus. Marine ornithology, 27, 43–47.
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Hamilton J-Ch, Charlassier R, Cressiot C, Kaplan J, Piat M, Rosset C, . (2008). Sensitivity of a bolometric interferometer to the cosmic microwave backgroud power spectrum
. A&A, 491(3), 923–927.
Abstract: Context. The search for B-mode polarization fluctuations in the Cosmic Microwave Background is one of the main challenges of modern cosmology. The expected level of the B-mode signal is very low and therefore requires the development of highly sensitive instruments with low systematic errors. An appealing possibility is bolometric interferometry. Aims. We compare in this article the sensitivity on the CMB angular power spectrum achieved with direct imaging, heterodyne and bolometric interferometry. Methods. Using a simple power spectrum estimator, we calculate its variance leading to the counterpart for bolometric interferometry of the well known Knox formula for direct imaging. Results. We find that bolometric interferometry is less sensitive than direct imaging. However, as expected, it is finally more sensitive than heterodyne interferometry due to the low noise of the bolometers. It therefore appears as an alternative to direct imagers with different and possibly lower systematic errors, mainly due to the absence of an optical setup in front of the horns.
Programme: 915
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