Institution
Institut Universitaire de France
Education•Paris, France•
About: Institut Universitaire de France is a education organization based out in Paris, France. It is known for research contribution in the topics: Population & Catalysis. The organization has 1905 authors who have published 9042 publications receiving 309878 citations.
Papers published on a yearly basis
Papers
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TL;DR: The results revealed that the interaction between spelling and motor processing was present already at age 8 and became more adult-like at ages 9 and 10, and suggested that orthographic regularity has a stronger impact on writing than word frequency.
90 citations
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TL;DR: In this article, the authors identified four brown dwarfs in the Taurus star-forming region from low-resolution optical spectra obtained at the William Herschel telescope and derived spectral types in the range M7--M9.
Abstract: We have identified four brown dwarfs in the Taurus star-forming region. They were first selected from $R$ and $I$ CCD photometry of 2.29 square degrees obtained at the Canada-France-Hawaii Telescope. Subsequently, they were recovered in the 2MASS second incremental data release point source catalog. Low-resolution optical spectra obtained at the William Herschel telescope allow us to derive spectral types in the range M7--M9. One of the brown dwarfs has very strong H$\alpha$ emission (EW=-340 \AA). It also displays Br$\gamma$ emission in an infrared spectrum obtained with IRCS on the Subaru telescope, suggesting that it is accreting matter from a disk. The \ion{K}{1} resonance doublet and the \ion{Na}{1} subordinate doublet at 818.3 and 819.5 nm in these Taurus objects are weaker than in field dwarfs of similar spectral type, consistent with low surface gravities as expected for young brown dwarfs. Two of the objects are cooler and fainter than GG Tau Bb, the lowest mass known member of the Taurus association. We estimate masses of only 0.03 M$_\odot$ for them. The spatial distribution of brown dwarfs in Taurus hints to a possible anticorrelation between the density of stars and the density of brown dwarfs.
90 citations
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TL;DR: In this paper, the environmental meaning of the oxygen isotope record in fossil reptiles is discussed on the basis of known paleoecology, modern fauna analogs, and apatite chemistry (rare earth elements (REE), CO32− and PO43− contents).
90 citations
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TL;DR: Pb and Ba concentrations and Pb isotopic compositions are reported for firn core and snow pit samples from Victoria Land, Antarctica, dating from 1872 AD to 1994 AD as discussed by the authors.
90 citations
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TL;DR: Comparisons with experimental results revealed that TDA is generally able to reproduce the experimental band shapes along with the positions of the absorption and emission peaks, and leads to a better agreement between theory and experiment compared to TDDFT for the majority of the molecules studied.
Abstract: The reliability of the Tamm-Dancoff approximation (TDA) for predicting vibrationally resolved absorption and emission spectra of several prototypical conjugated molecules has been addressed by performing a series of extensive theoretical calculations. To this end, we have systematically compared the TDA results with the full Time-Dependent Density Functional Theory (TDDFT), the Random Phase Approximation (RPA), as well as the Configuration Interaction Singles (CIS) methods that are routinely employed for the prediction of optical spectra of large molecules. Comparisons have been made with experimental results for both the band shapes and 0-0 energies. They revealed that TDA is generally able to reproduce the experimental band shapes along with the positions of the absorption and emission peaks. With respect to TDDFT, TDA leads to an underestimation of the relative intensities for most cases but does not alter any other feature of the spectra. For the case of 0-0 energies, it leads to a better agreement between theory and experiment compared to TDDFT for the majority of the molecules studied, at least when combined with the popular B3LYP functional.
90 citations
Authors
Showing all 2050 results
Name | H-index | Papers | Citations |
---|---|---|---|
Guido Kroemer | 236 | 1404 | 246571 |
Guilaine Lagache | 131 | 476 | 98069 |
Stéphane Udry | 128 | 960 | 67888 |
I. A. Grenier | 114 | 257 | 47803 |
Eric Vivier | 110 | 452 | 44199 |
Christian Serre | 110 | 419 | 56800 |
Gérard Férey | 103 | 518 | 52722 |
Pierre Laurent-Puig | 96 | 530 | 47757 |
Fabien Zoulim | 96 | 641 | 35807 |
Michael D. Ward | 95 | 823 | 36892 |
Stéphane Viel | 93 | 442 | 42317 |
Pavel Kroupa | 91 | 560 | 34903 |
Damien Ségransan | 91 | 516 | 38969 |
Oliver Kepp | 90 | 299 | 44077 |
Patrice Simon | 89 | 264 | 66332 |