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183 results on '"Lemarchand, D."'

16. The influence of rivers on marine boron isotopes and implications for reconstructing past ocean pH

Author

Lemarchand, D., Gaillardet, J., Lewin, E., and Allegre, C. J.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): D. Lemarchand (corresponding author); J. Gaillardet; Ã. Lewin; C. J. Allègre Ocean pH is particularly sensitive to atmospheric carbon dioxide content [1, 2, 3]. Records of ocean pH can [...]

Published
2000
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18. Thermomagnetic study of the high-temperature oxidation behavior of Nd-Fe-B permanent magnets and powders

Author

Lemarchand, D., Delamare, J., and Vigier, P.

Subjects
Magnets -- Thermal properties, Iron -- Metallurgy, Oxidation-reduction reaction -- Research, Sintering -- Research, Physics
Abstract

Oxidation kinetics changed at temperatures below 400 degrees Celsius for permanent and powdered Nd-Fe-B magnets in an experiment to measure oxidation under heat treatment at 360-600 degrees Celsius and a pressure of 1 Pa. The magnets were studied under states equivalent to that of thermally annealing sintered magnets. The compositions of four types of sintered magnets was compared after thermal annealing, to obtain coefficients for temperature dependence and specific magnetization.

Published
1992

24. The influence of microstructure on magnetoresistive properties of Cu80Fe5Ni15 ribbons.

Author

Cazottes, S., Fnidiki, A., Lemarchand, D., Danoix, F., Ochin, P., Lardé, R., and Coisson, M.

Subjects
MICROSTRUCTURE, PARTICLES (Nuclear physics), PHYSICAL & theoretical chemistry, MAGNETIC properties, TRANSMISSION electron microscopy
Abstract

The influence of microstructure on magnetoresistive properties of Cu80Fe5Ni15 (at. %) melt-spun and annealed ribbons was studied. The microstructure was characterized by means of energy filtered transmission electron microscopy, small angle neutron scattering and atom probe tomography. Giant magnetoresistance (GMR) measurements were made at low temperature. The samples were annealed for 2 h at different temperatures from 400 °C to 600 °C in order to modify their microstructure and thus their GMR properties. The magnetic behavior was correlated to the structural data to explain the GMR properties that are observed. A precise structural characterization, using atom probe tomography, small angle neutron scattering and energy filtered transmission electron microscopy, is presented. It reveals that no precipitates or clusters are present into the core grains of the as spun state; thus the sample is a solid solution. The magnetic properties measurements indicate that the ribbon exhibits a superparamagnetic behavior and presents relatively high GMR properties. These results imply that GMR can be obtained from a solid solution. Therefore, interface scattering is not the only precursor for GMR. The presence of diluted magnetic atoms leads to the formation of magnetic clusters that behave like superparamagnetic particles which are interacting and creating GMR. [ABSTRACT FROM AUTHOR]

Published
2011
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25. Influence of magnetic interactions on magnetic and magnetoresistive properties of Cu80Fe10Ni10 ribbons.

Author

Cazottes, S., Coïsson, M., Fnidiki, A., Lemarchand, D., and Danoix, F.

Subjects
MAGNETIC properties, MAGNETORESISTANCE, COPPER, IRON, NICKEL, MAGNETIZATION, HYSTERESIS, ELECTRONS
Abstract

Magnetic and magnetotransport properties measurements of Cu80Fe10Ni10 (at. %) melt spun and annealed ribbons were combined to study the magnetic interactions present in this system. Those ribbons are composed of magnetic FeNi rich precipitates embedded in a nonmagnetic Cu rich matrix. When the precipitates are small enough, they have a superparamagnetic behavior. Upon annealing the precipitates get larger and progressively turn ferromagnetic. The relatively high magnetoresistive properties are attributed to the presence of those superparamagnetic precipitates. Using Mössbauer spectrometry, Zero Field Cooled/Field Cooled and magnetization curves, the presence of interactions among the precipitates was evidenced, which degrades the magnetoresistance properties. Using Allia model, the magnetic coherence length Rm between the precipitates was calculated and compared with the mean free path of the electrons λ, with the precipitates size and the mean distance between them. Three different regimes were observed. At high fields, where Rm<λ, meaning that the precipitates are not interacting, at smaller fields, where Rm>λ and the precipitates are in the so called “interacting superparamagnetic regime,” and at low fields, and at 5 K, Rm>10λ, the magnetic interactions among the precipitates are strong and give rise to a hysteresis on the magnetization curves. [ABSTRACT FROM AUTHOR]

Published
2009
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26. Influence of magnetic interactions on magnetic and magnetoresistive properties of [Cu.sub.80][Fe.sub.10][Ni.sub.10] ribbons

Author

Cazottes, S., Coisson, M., Fnidiki, A., Lemarchand, D., and Danoix, F.

Subjects
Copper alloys -- Magnetic properties, Copper alloys -- Electric properties, Iron -- Magnetic properties, Iron -- Electric properties, Magnetoresistance -- Evaluation, Nickel -- Magnetic properties, Nickel -- Electric properties, Physics
Abstract

Magnetic and magnetotransport properties measurements of [Cu.sub.80][Fe.sub.10][Ni.sub.10] melt spun and annealed ribbons are combined to study the magnetic interactions. The ribbons are composed of magnetic FeNi rich precipitates embedded in a nonmagnetic Cu rich matrix and the high magnetoresistive properties are attributed to the presence of those superparamagnetic precipitates.

Published
2009

27. Insight into biotite weathering rate using U-series isotopes

Author

Rihs, S., Gontier, Alice, Turpault, Marie-Pierre, Lemarchand, D., Voinot, Alexandre, Chabaux, François, Laboratoire d'Hydrologie et de Géochimie de Strasbourg (LHyGeS), École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Ecole et Observatoire des Sciences de la Terre (EOST), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Unité de recherche Biogéochimie des Ecosystèmes Forestiers (BEF), Institut National de la Recherche Agronomique (INRA), and ProdInra, Migration

Subjects
[SDV] Life Sciences [q-bio], [SDV]Life Sciences [q-bio], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2013

28. Boron behavior during silicate weathering : clues from bulk mineral and intracrystaline investigations

Author

Lemarchand, D., Voinot, Alexandre, Florian, P., Neuville, D., Turpault, Marie-Pierre, ProdInra, Migration, Université de Strasbourg (UNISTRA), Unité de recherche Biogéochimie des Ecosystèmes Forestiers (BEF), Institut National de la Recherche Agronomique (INRA), Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), Université d'Orléans (UO)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDV] Life Sciences [q-bio], silicate, [SDV]Life Sciences [q-bio], boron, intracrystaline investigations, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2013

29. Insight into the use of U- and Th-series nuclides for soil-production rates determination

Author

Gontier, Alice, Rihs, S., Pelt, E., Turpault, Marie-Pierre, Lemarchand, D., Chabaux, François, Université de Strasbourg (UNISTRA), Unité de recherche Biogéochimie des Ecosystèmes Forestiers (BEF), Institut National de la Recherche Agronomique (INRA), and ProdInra, Migration

Subjects
[SDV.BV]Life Sciences [q-bio]/Vegetal Biology, [SDV.BV] Life Sciences [q-bio]/Vegetal Biology, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2013

30. Mechanisms of primary mineral weathering inferred from boron isotopes

Author

Voinot, Alexandre, Turpault, Marie-Pierre, Chabaux, François, Lemarchand, D., Laboratoire d'Hydrologie et de Géochimie de Strasbourg (LHyGeS), École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Ecole et Observatoire des Sciences de la Terre (EOST), Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Unité de recherche Biogéochimie des Ecosystèmes Forestiers (BEF), Institut National de la Recherche Agronomique (INRA), Sol Agro et hydrosystème Spatialisation (SAS), Institut National de la Recherche Agronomique (INRA)-AGROCAMPUS OUEST, ProdInra, Archive Ouverte, Ecole et Observatoire des Sciences de la Terre (EOST), Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), and Institut national des sciences de l'Univers (INSU - CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDV] Life Sciences [q-bio], boron isotopes, [SDV]Life Sciences [q-bio], primary mineral weathering
Abstract

Mechanisms of primary mineral weathering inferred from boron isotopes. European Geosciences Union General Assembly 2012

Published
2012

31. Boron as a proxy of the evolution of primary mineral weathering mechanisms: from the bedrock to the surface

Author

Voinot, Alexandre, Lemarchand, D., Chabaux, François, Turpault, Marie-Pierre, Unité de recherche Biogéochimie des Ecosystèmes Forestiers (BEF), Institut National de la Recherche Agronomique (INRA), Université de Strasbourg (UNISTRA), and ProdInra, Migration

Subjects
[SDV] Life Sciences [q-bio], primary mineral weathering mechanisms, bedrock to the surface, [SDV]Life Sciences [q-bio], ComputingMilieux_MISCELLANEOUS, Boron
Abstract

International audience

Published
2012

32. From bulk soil to intracrystalline investigation of plant-mineral interaction

Author

Lemarchand, D., Voinot, Alexandre, Chabaux, François, Turpault, Marie-Pierre, Université de Strasbourg (UNISTRA), Unité de recherche Biogéochimie des Ecosystèmes Forestiers (BEF), Institut National de la Recherche Agronomique (INRA), and ProdInra, Migration

Subjects
[SDV] Life Sciences [q-bio], intracrystalline investigation, [SDV]Life Sciences [q-bio], bulk soil, ComputingMilieux_MISCELLANEOUS, plant-mineral interaction
Abstract

International audience

Published
2011

33. Distribution of Stable Isotopes in Soil: A Clue to Discriminate between Lithogenic and Biogenic Fluxes

Author

Lemarchand, D., Cividini, D., Lemarchand, Éric, Pierret, M.-C., Chabaux, F., Centre de géochimie de la surface (CGS), Centre National de la Recherche Scientifique (CNRS)-Université Louis Pasteur - Strasbourg I-Institut national des sciences de l'Univers (INSU - CNRS), Aunis, Danièle, and Institut national des sciences de l'Univers (INSU - CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2008

34. Bio-Geochemical Cycles in Acidic Soils from a Granitic Watershed

Author

Pierret, M.-C., Stille, P., Chabaux, F., Viville, D., Prunier, J., Lemarchand, D., Centre de géochimie de la surface (CGS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Aunis, Danièle, and Centre National de la Recherche Scientifique (CNRS)-Université Louis Pasteur - Strasbourg I-Institut national des sciences de l'Univers (INSU - CNRS)

Subjects
ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2008

35. Time Constants of Chemical Transfers in a Forested Ecosystem Inferred from Short-Lived Nuclides (226-228Ra, 210Pb and 137Cs)

Author

Rihs, S., Thien, B., Prunier, J., Lemarchand, D., Pierret, M.-C., Stille, P., Chabaux, F., Aunis, Danièle, Centre de géochimie de la surface (CGS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université Louis Pasteur - Strasbourg I-Institut national des sciences de l'Univers (INSU - CNRS)

Subjects
ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2008

36. Origin of calcium isotope, fractionation in river waters : evidence from the Strengbach catchment, France

Author

Bénédicte Cenki-Tok, Chabaux, F., Lemarchand, D., Stille, P., Bagard, M. -L, Pierret, M. -C, Centre de géochimie de la surface (CGS), Centre National de la Recherche Scientifique (CNRS)-Université Louis Pasteur - Strasbourg I-Institut national des sciences de l'Univers (INSU - CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Aunis, Danièle

Subjects
[SDE.MCG.SIC]Environmental Sciences/Global Changes/domain_sde.mcg.sic, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, [SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry, ComputingMilieux_MISCELLANEOUS, [SDE.MCG.SIC] Environmental Sciences/Global Changes/domain_sde.mcg.sic
Abstract

International audience

Published
2007

37. Chemical and isotopical variations of surface waters at the Strengbach forested watershed (NE France): lithological and biological control

Author

Pierret, M.C., Chabaux, F., Stille, P., Prunier, Jérôme, Viville, D., Lemarchand, D., Centre de géochimie de la surface (CGS), Centre National de la Recherche Scientifique (CNRS)-Université Louis Pasteur - Strasbourg I-Institut national des sciences de l'Univers (INSU - CNRS), Aunis, Danièle, and Institut national des sciences de l'Univers (INSU - CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDE.MCG.SIC]Environmental Sciences/Global Changes/domain_sde.mcg.sic, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, [SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry, ComputingMilieux_MISCELLANEOUS, [SDE.MCG.SIC] Environmental Sciences/Global Changes/domain_sde.mcg.sic
Abstract

International audience

Published
2007

38. Vegetation cycling regulates dissolved B in forested watershed

Author

Cividini, D., Lemarchand, D., Chabaux, F., Aunis, Danièle, Centre de géochimie de la surface (CGS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université Louis Pasteur - Strasbourg I-Institut national des sciences de l'Univers (INSU - CNRS)

Subjects
[SDE.MCG.SIC]Environmental Sciences/Global Changes/domain_sde.mcg.sic, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, [SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry, ComputingMilieux_MISCELLANEOUS, [SDE.MCG.SIC] Environmental Sciences/Global Changes/domain_sde.mcg.sic
Abstract

International audience

Published
2007

39. Tracing water/rock interactions in groundwaters by B isotopes

Author

Lemarchand, D., Chabaux, F., Cividini, D., Jacobson, A.J., Centre de géochimie de la surface (CGS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Geophys. Res. Abstr. 8, Aunis, Danièle, and Centre National de la Recherche Scientifique (CNRS)-Université Louis Pasteur - Strasbourg I-Institut national des sciences de l'Univers (INSU - CNRS)

Subjects
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, [SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry
Published
2006

40. Tracing plant-water-soil interactions at the plot scale (in the Strengbach catchment). Insights from analyses of major elements and U isotopes

Author

Prunier, Jérôme, Pierret, M.C., Chabaux, F., Trémolières, M., Lemarchand, D., Centre de géochimie de la surface (CGS), Centre National de la Recherche Scientifique (CNRS)-Université Louis Pasteur - Strasbourg I-Institut national des sciences de l'Univers (INSU - CNRS), Geophys. Res. Abstr. 8, Institut national des sciences de l'Univers (INSU - CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Aunis, Danièle

Subjects
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, [SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry
Published
2006

41. Intercomparison of boron isotope and concentration measurements. Part II: Evaluation of results

Author

Gonfiantini, R., Tonarini, S., Adorni-Braccesi, A., Al-Ammar, A., Astner, M., Bächler, S., Barnes, R., Bassett, R., Cocherie, A., Deyhle, A., Dini, A., Ferrara, G., Gaillardet, J., Grimm, J., Guerrot, C., Krähenbühl, U., Layne, G., Lemarchand, D., Meixner, A., Northington, D., Pennisi, M., Reitznerová, E., Rodushkin, I., Sugiura, N., Surberg, R., Tonn, S., Wiedenbeck, M., Wunderli, S., Xiao, Y., and Zack, T.

Subjects
550 - Earth sciences
Published
2003

42. Influence of physical pretreatments on the thermal behaviour of α-lactose monohydrate

Author

Garnier, S., Mallet, F., Lemarchand, D., Petit, S., Coquerel, G., Sciences et Méthodes Séparatives (SMS), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU), and Lemercier, Aurélien

Subjects
[CHIM.MATE] Chemical Sciences/Material chemistry, [CHIM.ORGA]Chemical Sciences/Organic chemistry, [CHIM] Chemical Sciences, [CHIM.CRIS]Chemical Sciences/Cristallography, [CHIM]Chemical Sciences, [CHIM.MATE]Chemical Sciences/Material chemistry, [CHIM.CRIS] Chemical Sciences/Cristallography, [CHIM.ORGA] Chemical Sciences/Organic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2002

43. Preferential crystallization of (+/-) 5(4’-methylphenyl)-5-methylhydantoin (17H). Comparison between SIPC and AS3PC processes. Influence of the polymorphic form of the seeds

Author

Courvoisier, L., Lemarchand, D., Mignot, L., Petit, M.N., Coquerel, G., Sciences et Méthodes Séparatives (SMS), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU), and Lemercier, Aurélien

Subjects
[CHIM.MATE] Chemical Sciences/Material chemistry, [CHIM.ORGA]Chemical Sciences/Organic chemistry, [CHIM] Chemical Sciences, [CHIM.CRIS]Chemical Sciences/Cristallography, [CHIM]Chemical Sciences, [CHIM.MATE]Chemical Sciences/Material chemistry, [CHIM.CRIS] Chemical Sciences/Cristallography, [CHIM.ORGA] Chemical Sciences/Organic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2001

44. Solvent exchange between DMSO and water in the dexamethasone acetate structure

Author

Mallet, F., Petit, S., Petit, M.N., Lemarchand, D., Billot, P., Lafont, S., Coquerel, G., Lemercier, Aurélien, Sciences et Méthodes Séparatives (SMS), Université de Rouen Normandie (UNIROUEN), and Normandie Université (NU)-Normandie Université (NU)

Subjects
[CHIM.MATE] Chemical Sciences/Material chemistry, [CHIM.ORGA]Chemical Sciences/Organic chemistry, [CHIM] Chemical Sciences, [CHIM.CRIS]Chemical Sciences/Cristallography, [CHIM]Chemical Sciences, [CHIM.MATE]Chemical Sciences/Material chemistry, [CHIM.CRIS] Chemical Sciences/Cristallography, [CHIM.ORGA] Chemical Sciences/Organic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2001

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