Search Results - (Author, Cooperation:C. Sotin)
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1Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2018-01-31Publisher: Wiley-BlackwellPrint ISSN: 0148-0227Topics: GeosciencesPhysicsPublished by: -
2Latest Papers from Table of Contents or Articles in PressL. N. Fletcher ; B. E. Hesman ; P. G. Irwin ; K. H. Baines ; T. W. Momary ; A. Sanchez-Lavega ; F. M. Flasar ; P. L. Read ; G. S. Orton ; A. Simon-Miller ; R. Hueso ; G. L. Bjoraker ; A. Mamoutkine ; T. del Rio-Gaztelurrutia ; J. M. Gomez ; B. Buratti ; R. N. Clark ; P. D. Nicholson ; C. Sotin
American Association for the Advancement of Science (AAAS)
Published 2011Staff ViewPublication Date: 2011-05-21Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
3Latest Papers from Table of Contents or Articles in PressM. M. Hedman ; C. M. Gosmeyer ; P. D. Nicholson ; C. Sotin ; R. H. Brown ; R. N. Clark ; K. H. Baines ; B. J. Buratti ; M. R. Showalter
Nature Publishing Group (NPG)
Published 2013Staff ViewPublication Date: 2013-08-02Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsPublished by: -
4Articles: DFG German National LicensesStaff View
ISSN: 1365-246XSource: Blackwell Publishing Journal Backfiles 1879-2005Topics: GeosciencesNotes: The structure and time dependence of 3-D thermal convection in a volumetrically heated, infinite Prandtl number fluid is examined for high values of the Rayleigh number. The methods employed allow the numerical experiments to proceed for long-enough times to derive good estimates of mean and fluctuating parts of the structure. An iterative multirigid method to solve for the buoyant, incompressible viscous flow at each time step of the energy equation is a novel aspect of the methodology. A simple explicit time step of the energy equation is utilized that vectorizes well on serial computers and which is ideally suited to massively parallel computers. Numerical experiments were carried out for Rayleigh numbers from 3 × 106 to 3 × 107 in a cartesian region with a prescribed temperature at the top boundary and an adiabatic bottom boundary. Over this complete range of Rayleigh number, the flow structure consists dominantly of cold, nearly axisymmetric plumes that migrate horizontally sweeping off the cold thermal-boundary layer that forms at the top of the convecting fluid. Plumes disappear by coalescing with other plumes; new plumes are created by thermal-boundary-layer instability. Sheet plumes form only occasionally and do not penetrate to significant depths in the fluid. Plumes have sizes comparable to the thickness of the thermal-boundary layer and an average spacing comparable to the fluid depth. No persistent large-scale motion in the fluid can be identified. Its absence may reflect the large subadiabatic stratification that develops beneath the thermal-boundary layer as cold plumes penetrate to the bottom boundary without thermally equilibrating with surrounding fluid. We consider the possible implications for convection in planetary mantles and for the existence of plate tectonics.Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesDalton, J. B. ; Ore, C. M. Dalle ; Bauer, J. ; Stephan, K. ; Filacchione, G. ; Hendrix, A. R. ; Hansen, C. J. ; Coradini, A. ; Cerroni, P. ; Tosi, F. ; Capaccioni, F. ; Jaumann, R. ; Buratti, B. J. ; Clark, R. N. ; Brown, R. H. ; Nelson, R. M. ; McCord, T. B. ; Baines, K. H. ; Nicholson, P. D. ; Sotin, C. ; Meyer, A. W. ; Bellucci, G. ; Combes, M. ; Bibring, J.-P. ; Langevin, Y.
[s.l.] : Nature Publishing Group
Published 2007Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Hyperion, Saturn’s eighth largest icy satellite, is a body of irregular shape in a state of chaotic rotation. The surface is segregated into two distinct units. A spatially dominant high-albedo unit having the strong signature of H2O ice contrasts with a unit that is about a ...Type of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesBrown, Robert H. ; Jaumann, Ralf ; Cruikshank, Dale P. ; Nelson, Robert M. ; Buratti, Bonnie J. ; McCord, Thomas B. ; Lunine, J. ; Baines, K. H. ; Bellucci, G. ; Bibring, J.-P. ; Capaccioni, F. ; Cerroni, P. ; Coradini, A. ; Formisano, V. ; Langevin, Y. ; Matson, D. L. ; Mennella, V. ; Nicholson, P. D. ; Sicardy, B. ; Sotin, C. ; Hoefen, Todd M. ; Curchin, John M. ; Hansen, Gary ; Hibbits, Karl ; Matz, K.-D.
[s.l.] : Macmillian Magazines Ltd.
Published 2005Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] The origin of Phoebe, which is the outermost large satellite of Saturn, is of particular interest because its inclined, retrograde orbit suggests that it was gravitationally captured by Saturn, having accreted outside the region of the solar nebula in which Saturn formed. By contrast, ...Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 0012-821XSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: GeosciencesPhysicsType of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 0031-9201Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: GeosciencesPhysicsType of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 0031-9201Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: GeosciencesPhysicsType of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 0032-0633Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: GeosciencesPhysicsType of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesBibring, J.-P. ; Erard, S. ; Gondet, B. ; Langevin, Y. ; Soufflot, A. ; Combes, M. ; Cara, C. ; Drossart, P. ; Dyachkov, A.V. ; Grygoriev, A.V. ; Kiselev, A.V. ; Sotin, C. ; Lellouch, E. ; Khatuntsev, I.V. ; Rosenqvist, J. ; Ksanfomality, L.V. ; Havinson, N.G. ; Forni, O. ; Masson, P. ; Encrenaz, T. ; Moroz, V.I. ; Nikolsky, Y.V.
Amsterdam : ElsevierStaff ViewISSN: 0032-0633Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: GeosciencesPhysicsType of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesCombes, M. ; Cara, C. ; Drossart, P. ; Encrenaz, T. ; Lellouch, E. ; Rosenqvist, J. ; Bibring, J.-P. ; Erard, S. ; Soufflot, A. ; Grygoriev, A.V. ; Gondet, B. ; Sotin, C. ; Titov, D.V. ; Ksanfomality, L.V. ; Sanko, N.F. ; Forni, O. ; Masson, P. ; Moroz, V.I. ; Langevin, Y. ; Nikolsky, Y.V.
Amsterdam : ElsevierStaff ViewISSN: 0032-0633Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: GeosciencesPhysicsType of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesStaff View
ISSN: 1432-0967Source: Springer Online Journal Archives 1860-2000Topics: GeosciencesNotes: Abstract The available experimental data on garnet-bearing-assemblages for synthetic chemical systems (MAS, FMAS, CMAS) have been used to calibrate consistent models for the Al-solubility in orthopyroxene coexisting with garnet, on the basis of equilibrium reaction Py(opx) ⇔ Py(gt). The alternative reaction En(opx)+MgTs(opx) ⇔ Py(gt) is discarded as it yields larger a-posteriori uncertainties. To provide a reliable equation, directly applicable to natural garnet lherzolites, each successive synthetic-system calibration is tested against Mori and Green's (1978) natural-system reequilibration data. For the MAS system, an ideal solution model with constant ΔH°, ΔV° and ΔS° based on 12-oxygen structural formulae for aluminous pyroxenes yields the best fit (GPa, K), $${\text{25,134 + 9,941 }}P - 23.177{\text{ }}T{\text{ + }}RT{\text{ ln (}}X_{{\text{Al}}}^{TB'} {\text{) = 0}}$$ . The MAS synthetic-system calibration can be directly applied to the FMAS system by adding an empirical correction term (20,835 [X Fe gt ]2) independent of either pressure and temperature. However, this correction term is not important because of the limited Fe content of mantle peridotites. When calcium is added to the MAS system, the equilibrium constant is calculated as: $$K_{{\text{CMAS}}} = {{[(1 - X_{{\text{Ca}}}^{M2} )^2 (X_{{\text{Al}}}^{TB'} )]} \mathord{\left/ {\vphantom {{[(1 - X_{{\text{Ca}}}^{M2} )^2 (X_{{\text{Al}}}^{TB'} )]} {[(1 - X_{{\text{Ca}}}^X )^3 (X_{{\text{Al}}}^Y )^2 ]}}} \right. \kern-\nulldelimiterspace} {[(1 - X_{{\text{Ca}}}^X )^3 (X_{{\text{Al}}}^Y )^2 ]}}$$ where M2 and TB′ are pyroxene sites and X and Y are garnet sites. Up to 5 GPa, X Ca X ∼ and the CMAS experimental data agree well with the MAS model, but for Yamada and Takahashi's (1983) higher pressure experiments (up to 10 GPa), this no longer holds. Indeed, the garnet solid solution does not behave ideally and an asymmetric regular solution model is needed for application to the deepest natural samples available (〉7GPa). Calibration based on new high pressure data yields, $$\begin{gathered} \Delta G_{{\text{CMAS}}}^{XS} = (X_{{\text{Ca}}}^X )(1 - X_{{\text{Ca}}}^X )(0.147 - X_{{\text{Ca}}}^X ) \hfill \\ {\text{ }} \cdot {\text{(6,440,535 - 1,490,654 }}P{\text{)}} \hfill \\ \end{gathered}$$ . According to tests of the inferred solution model, the CFMAS system is a good analogue of natural systems in the pressure, temperature and composition ranges covered by the natural-system reequilibration data (up to 1,500° C and 4 GPa). Simultaneous application of this thermobarometer and of the two-pyroxene mutual solubility thermometer (Bertrand and Mercier 1985) to the phases of the garnet-peridotite xenoliths from Thaba Putsoa, Lesotho, yields a refined paleogeotherm for southern Africa strongly contrasting with previous results. The “granular” nodules yield a thermal gradient of about 8 K/km characteristic of a lithospheric-type environment, whereas the “sheared” ones show a lower gradient of about 1 K/km. This is a typical geotherm expected for a steady thermal state with an inflexion point at the depth of about 160 km corresponding to the lithosphere/asthenosphere boundary.Type of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesBibring, J.-P. ; Combes, M. ; Langevin, Y. ; Soufflot, A. ; Cara, C. ; Drossart, P. ; Encrenaz, Th. ; Erard, S. ; Forni, O. ; Gondet, B. ; Ksanfomalfty, L. ; Lellouch, E. ; Masson, Ph. ; Moroz, V. ; Rocard, F. ; Rosenqvist, J. ; Sotin, C.
[s.l.] : Nature Publishing Group
Published 1989Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] The first (1.65-3.16 jxm) and second (0.76-1.54 jjim) orders of the grating spectrometer are separately focused onto two 64-pixel PbS arrays by a dichroic beam-splitter. The resulting resolution is 0.025 and 0.0125 |xm per pixel in the first and second order, respectively. The telescope is 2.5 cm ...Type of Medium: Electronic ResourceURL: -
15Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Fig. 1 Phase diagram of ice6 showing our experimental conditions (x); and conditions for which the value of viscosity was extrapolated (O). Parmentier and Head3 have shown that if the viscosity of high-pressure ices near their melting point is lower than 1017 P, solid state convection can take ...Type of Medium: Electronic ResourceURL: