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Institution

Conservatoire national des arts et métiers

EducationParis, France
About: Conservatoire national des arts et métiers is a education organization based out in Paris, France. It is known for research contribution in the topics: Population & Orthogonal frequency-division multiplexing. The organization has 3573 authors who have published 7127 publications receiving 141430 citations. The organization is also known as: CNAM & Conservatoire des arts et métiers.


Papers
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Journal ArticleDOI
TL;DR: The Metrology for Meteorology (MeteoMet) project as mentioned in this paper is an attempt to bridge the meteorological and metrological communities, which is the concept of traceability, an idea used in both fields but with a subtle difference in meaning.
Abstract: The study describes significant outcomes of the Metrology for Meteorology' project, MeteoMet, which is an attempt to bridge the meteorological and metrological communities. The concept of traceability, an idea used in both fields but with a subtle difference in meaning, is at the heart of the project. For meteorology, a traceable measurement is the one that can be traced back to a particular instrument, time and location. From a metrological perspective, traceability further implies that the measurement can be traced back to a primary realization of the quantity being measured in terms of the base units of the International System of Units, the SI. These two perspectives reflect long-standing differences in culture and practice and this project - and this study - represents only the first step towards better communication between the two communities. The 3 year MeteoMet project was funded by the European Metrology Research Program (EMRP) and involved 18 European National Metrological Institutes, 3 universities and 35 collaborating stakeholders including national meteorology organizations, research institutes, universities, associations and instrument companies. The project brought a metrological perspective to several long-standing measurement problems in meteorology and climatology, varying from conventional ground-based measurements to those made in the upper atmosphere. It included development and testing of novel instrumentation as well as improved calibration procedures and facilities, instrument intercomparison under realistic conditions and best practice dissemination. Additionally, the validation of historical temperature data series with respect to measurement uncertainties and a methodology for recalculation of the values were included.

54 citations

Journal ArticleDOI
TL;DR: In this article, the authors present an updated overview of the properties of transfer of geosynthetic liner materials used in environmental applications, focusing on the high temperatures that can be encountered and the concomitant risk of desiccation.

54 citations

Journal Article
TL;DR: A high prevalence of low concentrations of vitamin C, zinc and selenium was revealed and simple regression analysis showed that most vitamins and trace elements were significantly negatively correlated with age.
Abstract: A biochemical assessment of the vitamin and trace element status of 756 institutionalized elderly men and women, 66-103 years old (average 83.5 +/- 7.6 y), was conducted in 26 nursing homes in different areas of France. Serum concentrations of beta- and alpha-carotene, beta-cryptoxanthin, lycopene, retinol, alpha- and gamma-tocopherol, vitamin C, zinc and selenium were measured. A difference in biochemical markers according to sex was observed for vitamins E and C: elderly women had higher levels of alpha-tocopherol and vitamin C than elderly men. When expressed as a ratio of cholesterol, the difference between sexes for alpha-tocopherol disappeared. Simple regression analysis showed that most vitamins and trace elements were significantly negatively correlated with age. A high prevalence of low concentrations of vitamin C, zinc and selenium was revealed.

54 citations

Journal ArticleDOI
TL;DR: A multi-GPU version of GPUSPH, a CUDA implementation of fluid-dynamics models based on the smoothed particle hydrodynamics (SPH) numerical method, is presented and the Karp-Flatt metric is used to formally estimate the overall efficiency of the parallelization.
Abstract: We present a multi-GPU version of GPUSPH, a CUDA implementation of fluid-dynamics models based on the smoothed particle hydrodynamics (SPH) numerical method. The SPH is a well-known Lagrangian model for the simulation of free-surface fluid flows; it exposes a high degree of parallelism and has already been successfully ported to GPU. We extend the GPU-based simulator to run simulations on multiple GPUs simultaneously, to obtain a gain in speed and overcome the memory limitations of using a single device. The computational domain is spatially split with minimal overlapping and shared volume slices are updated at every iteration of the simulation. Data transfers are asynchronous with computations, thus completely covering the overhead introduced by slice exchange. A simple yet effective load balancing policy preserves the performance in case of unbalanced simulations due to asymmetric fluid topologies. The obtained speedup factor (up to 4.5x for 6 GPUs) closely follows the expected one (5x for 6 GPUs) and it is possible to run simulations with a higher number of particles than would fit on a single device. We use the Karp-Flatt metric to formally estimate the overall efficiency of the parallelization.

54 citations

Journal ArticleDOI
TL;DR: In this article, the photo-induced deprotonation of 7- and 8-hydroxyquinolines (7-and 8-HQ) was investigated in the presence of water molecules as acceptors.
Abstract: When the acidic and basic groups of an amphoteric compound become stronger on excitation, excited-state proton transfers (ESPT) are driven by the photoinduced synergy between the two functions. This is exemplified here by 7- and 8-hydroxyquinolines (7- and 8-HQ), whatever the initially excited form. For instance, the -OH group of the 7-hydroxyquinolinium form undergoes photoinduced deprotonation even in 8M HClO4! This reveals its outstanding photoacidity, confirmed by the value of the deprotonation rate constant k1 at infinite dilution, 5.5 × 1010 s−1. The decrease of k1 on increasing the ionic strength pointed out the key number of 4 water molecules as proton acceptors. In neutral medium, a very efficient photoinduced tautomerization is observed. For 7-HQ in water, a mechanism consisting of three competitive paths was established: A proton translocation via a bridge of water molecules within less than 10 ps for the cis-isomer, and two stepwise competitive reactions for the trans-isomer. Concerning the weakly fluorescent 8-HQ, the photoinduced tautomerization occurs even in organic media. In most solvents, an intrinsic ESPT takes place within intramolecularly H-bonded molecules, but preferential solvation by residual water of the solvent may lead to open structures where ESPT is impaired. In alkanes, a biprotonic ESPT is expected to occur within very stable dimers (Kdim= 7.0 × 107). In all cases, the coupling between proton transfers and an intramolecular electron transfer leads to the ketonic structure of the tautomer. This might be a general feature in phototautomerization reactions.

54 citations


Authors

Showing all 3635 results

NameH-indexPapersCitations
Joshua A. Salomon107435124708
Serge Hercberg10694256791
Pilar Galan9762846782
Patrice Simon8926466332
Yuh-Shan Ho8034648242
Pierre-Louis Taberna6820934293
J. David Spence6739917671
Mathilde Touvier6532131586
Sébastien Czernichow6427414654
Emmanuelle Kesse-Guyot5733810914
Valentin Petrov5474312127
Sandrine Bertrais531699618
Paco Bustamante522959136
Khaled Ezzedine503138939
Arnaud Fontanet5020411964
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20238
2022124
2021383
2020419
2019399
2018362