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TL;DR: In this paper, the effective mechanical properties of homogeneous porous media can be theoretically determined by a multiple scale expansion, where the media are modelled as being spatially periodic and elastic equations with appropriate boundary conditions are numerically solved on the unit cell to determine the macroscopic mechanical properties.
Abstract: The effective mechanical properties of homogeneous porous media can be theoretically determined by a multiple scale expansion. In such a scheme, the media are modelled as being spatially periodic. The elastic equations with appropriate boundary conditions are numerically solved on the unit cell to determine the macroscopic mechanical properties of the medium. Three types of unit cell were investigated: deterministic, fractal and random; the last type includes media derived from site percolation, random packings of spheres and a real sample of Fontainebleau sandstone. A systematic comparison is made with existing numerical data and with the predictions of various types of renormalization models.
50 citations
TL;DR: In this paper, it was shown that the toroidal and poloidal components of the core can be computed in the frozen flux approximation, assuming that the spectrum of the motion is of low degree and decreases with wave-number.
Abstract: Summary. Examples of core motions which generate the observed secular variation field – as given by various models for 1970 and 1980 – from the main field have been computed in the frozen flux approximation, assuming that the spectrum of the motion is of low degree and decreases with wave-number. No mode of degree > 4 in the expansion of the motion can be derived with any degree of confidence. Among the low degree modes, some appear to be stable (they come out with the same magnitude whatever the inversion scheme used). The flow made of these stable modes is then examined. An outstanding feature of the flow is the body westward drift. But it seems necessary, if one looks for such a regular flow, to consider both toroidal and poloidal components, which would imply upwelling and down-welling in the upper layers of the core. The toroidal part of the flow appears to be enhanced by the 1969 impulse, although its geometry is nearly unchanged. On the contrary the geometry of the computed poloidal part is different in 1980 and in 1970;
50 citations
TL;DR: In this paper, the structure of eight organic-rich samples collected at the margin and in the centre of the podzolic area of a soil sequence was investigated, and the overall molecular structure of their clay size fractions was assessed using Fourier transform infrared (FTIR) spectroscopy and cross polarization/magic angle spinning (CP/MAS) 13C nuclear magnetic resonance (NMR).
50 citations
TL;DR: In this article, the same authors calculated the 40Ar/39Ar determinations from the previous studies using recent revisited ages for 40Ar and 39Ar standards, and derived the best estimate for the MBT age derived from this compilation is 789±2 ka (analytical error), or 789 ± 8 ka (total error).
50 citations
TL;DR: In this paper, the authors investigate the Newtonian shear viscosity (η) of dry and hydrous melts from the Mercato (plinian) and 1906 (violent strombolian) eruptions.
49 citations
Authors
Showing all 903 results
| Name | H-index | Papers | Citations |
|---|---|---|---|
| Claude J. Allègre | 106 | 327 | 35092 |
| Paul Tapponnier | 99 | 294 | 42855 |
| Francesco Mauri | 85 | 352 | 69332 |
| Barbara Romanowicz | 67 | 284 | 14950 |
| Geoffrey C. P. King | 64 | 157 | 17177 |
| Yi-Gang Xu | 64 | 271 | 14292 |
| Jérôme Gaillardet | 63 | 199 | 14878 |
| François Guyot | 61 | 292 | 12444 |
| Georges Calas | 60 | 266 | 10901 |
| Ari P. Seitsonen | 59 | 212 | 45684 |
| Michele Lazzeri | 58 | 140 | 57079 |
| Bernard Bourdon | 58 | 118 | 9962 |
| Gianreto Manatschal | 56 | 200 | 10063 |
| Nikolai M. Shapiro | 56 | 154 | 15508 |
| Guillaume Morin | 55 | 156 | 7218 |