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9 results on '"Dubois, Frederic"'

1. Modeling of cold mix asphalt evolutive behaviour based on nonlinear viscoelastic spectral decomposition

Author

Lambert, Marion, Piau, Jean-Michel, Gaudefroy, Vincent, Millien, Anne, Dubois, Frederic, Petit, Christophe, and Chaignon, Francois

Subjects
Numerical analysis -- Usage, Asphalt -- Mechanical properties, Building materials -- Mechanical properties, Business, Construction and materials industries
Abstract

ABSTRACT Given a political context in which energy and environmental stakes have become increasingly dominant, road engineering practices have favoured saving energy and protecting the environment. Among these practices, the [...]

Published
2018
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2. On the crack tip propagation monitoring within wood material: Cluster analysis of acoustic emission data compared with numerical modelling

Author

Diakhate, Malick, Angellier, Nicolas, Pitti, Rostand Moutou, and Dubois, Frederic

Subjects
Concrete -- Cracking, Building materials -- Mechanical properties -- Acoustic properties -- Analysis, Acoustic emission testing -- Analysis -- Mechanical properties -- Acoustic properties, Business, Construction and materials industries
Abstract

ABSTRACT In this study, crack length evolutions evaluated from both experimental analysis (cluster analysis of acoustic emission activity) and numerical modelling are compared. The highlight of the work presented herein [...]

Published
2017
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3. Numerical model for mechanical behavior of lightweight concrete and for the prediction of local stress concentration

Author

Malachanne, Etienne, Sassine, Rita, Garcia-Diaz, Eric, and Dubois, Frederic

Subjects
Concrete -- Models -- Properties -- Mechanical properties, Finite element method -- Analysis, Microstructure -- Analysis, Business, Construction and materials industries
Abstract

ABSTRACT In this study a numerical approach to simulate elastic behavior of lightweight concrete, is presented, at mesoscopic level. Concrete is considered as a bi-phasic material, composed of a granular [...]

Published
2014
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4. Two cytosolic glutamine synthetase isoforms of maize are specifically involved in the control of grain production ([W])([OA])

Author

Martin, Antoine, Lee, Judy, Kichey, Thomas, Gerentes, Denise, Zivy, Michael, Tatout, Christophe, Dubois, Frederic, Balliau, Thierry, Valot, Benoit, Davanture, Marlene, Terce-Laforgue, Therese, Quillere, Isabelle, Coque, Marie, Gallais, Andre, Gonzalez-Moro, Maria-Begona, Bethencourt, Linda, Habash, Dimah Z., Lea, Peter J., Charcosset, Alain, Perez, Pascual, Murigneux, Alain, Sakakibara, Hitoshi, Edwards, Keith J., and Hirel, Bertrand

Subjects
Corn -- Research, Glutamine synthetase -- Research, Glutamine synthetase -- Structure, Isoenzymes -- Research, Isoenzymes -- Structure, Cytosol -- Structure, Cytosol -- Research, Biological sciences, Science and technology
Published
2006

5. Glutamate dehydrogenase of tobacco is mainly induced in the cytosol of phloem companion cells when ammonia is provided either externally or released during photorespiration

Author

Terce-Laforgue, Therese, Dubois, Frederic, Ferrario-Mery, Sylvie, de Crecenzo, Marie-Anne Pou, Sangwan, Rajbir, and Hirel, Bertrand

Subjects
Tobacco (Plant) -- Research, Oxidoreductases -- Research, Ammonia -- Usage, Plants -- Photorespiration, Plants -- Research, Biological sciences, Science and technology
Published
2004

6. A MALDI Sample Preparation Method Suitable for Insoluble Polymers

Author

Skelton, Randall, Dubois, Frederic, and Zenobi, Renato

Subjects
Mass spectrometry -- Research, Polyamides -- Research, Chemistry
Abstract

Polyamides are insoluble or poorly soluble in common organic solvents, which makes normal sample preparation for matrix-assisted laser desorption/ionization (MALDI) mass spectrometry very difficult. An new analytical protocol for MALDI analysis of polyamides or other insoluble samples is described. It consists of pressing a pellet from a solid mixture of the polymer and a matrix, both in the form of finely ground powder. This sample preparation is compared with the common dried droplet sample preparation method and found to perform much better, both in terms of robustness against variation of experimental parameters and high-mass capability.

Published
2000

7. Glutamine synthetase in the phloem plays a major role in controlling proline production

Author

Brugiere, Norbert, Dubois, Frederic, Limami, Anis M., Lelandais, Maud, Roux, Yvette, Sangwan, Rajbir S., and Hirel, Bertrand

Subjects
Glutamine -- Chemical properties, Tobacco (Plant) -- Chemical properties, Tobacco (Plant) -- Genetic aspects, Phloem -- Chemical properties, Phloem -- Research, Biological sciences, Science and technology
Published
1999

8. A graphite-assisted laser desorption/ionization study of light-induced aging in triterpene Dammar and Mastic varnishes

Author

Zumbuhl, Stefan, Knochenmuss, Richard, Wulfert, Stefan, Dubois, Frederic, Dale, Michael J., and Zenobi, Renato

Subjects
Ionization -- Research, Varnish and varnishing -- Analysis, Gums and resins -- Analysis, Fracture mechanics -- Research, Chemistry
Abstract

The light-induced aging of natural triterpenes used in varnishes was studied using graphite-assisted laser desorption/ionization mass spectrometry. This method was found to be superior to conventional matrix-assisted laser desorption/ionization for these materials because of higher signal levels and less chemical noise from the matrix. The dammar and mastic raw materials were found to be partially oxidized compared to their nominal composition, with up to six oxygens incorporated. The light-induced aging process leads initially to polymerization, up to trimers. Further aging leads to a decrease in average molecular weight. These observations are supplemented by FTIR and 13C NMR spectra which show complete reaction of keto groups to acids and peroxy species. A general mechanism for the process is proposed, and the consequences for properties of varnish films are investigated.

Published
1998

9. Immunogenetic determinants and prediction of IDDM in French schoolchildren

Author

Levy-Marchal, Claire, Dubois, Frederic, Noel, Michele, Tichet, Jean, and Czernichow, Paul

Subjects
Familial diseases -- Research -- Genetic aspects, Type 1 diabetes -- Genetic aspects -- Research, Islet cell stimulating antibodies -- Physiological aspects -- Research -- Genetic aspects, Health, Physiological aspects, Research, Genetic aspects
Abstract

Islet cell antibodies (ICAs) are predictive markers of the disease in first-degree relatives of patients with insulin-dependent diabetes mellitus (IDDM). The large majority of newly diagnosed cases, however, will develop [...]

Published
1995

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