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6. Association épidémiologique entre pollution et altérations oncogéniques dans le cancer du poumon

Author

Leblanc, S., primary, Genin, M., additional, Occelli, F., additional, Dauchet, L., additional, Leblanc, V., additional, Hominal, S., additional, Bizieux-Thaminy, A., additional, Thomassin, S., additional, Bernardi, M., additional, Briens, E., additional, Belmont, L., additional, Lefoll, C., additional, Renault, D., additional, Paysse, M., additional, Tierce, A., additional, Wasielewski, E., additional, Hamroun, A., additional, Debieuvre, D., additional, and Cortot, A., additional

Published
2024
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7. New opportunities for high pressure X-ray absorption spectroscopy at ID24-DCM and BM23 with the Extremely Brilliant Source of the ESRF.

Author

Rosa, A. D., Garbarino, G., Rodrigues, J. E., Mijit, E., Jacobs, J., Bugnazet, D., Pasternak, S., Berruyer, G., Moyne, A., Clavel, C., Perrin, F., Anzellini, S., Meneghini, C., Occelli, F., Zhan, X., Ishimatsu, N., Sakai, T., Boccato, S., Torchio, R., and Hernandez, J.-A.

Subjects
X-ray absorption, PHOTON flux, X-ray spectroscopy, MONOCHROMATORS, DETECTORS
Abstract

Here we present the new experimental stations devoted to the studies of matter under extreme conditions at the X-ray absorption beamlines BM23 and ID24-DCM that were recently refurbished within the ESRF – Extremely Brilliant Source (EBS) upgrade program. In comparison with the stations before the EBS upgrade, they exhibit outstanding performances in terms of sample positioning capabilities, acceptance of multi-detection systems and complex sample environments. In addition, significant improvements regarding the photon flux and focusing capabilities down to the submicron size have been achieved. These stations are now coupled with the new ESRF double crystal monochromators that exhibit an exceptional beam position and energy stability and that permit quick micro-EXAFS measurements down to one EXAFS/second, and hyperspectral EXAFS mapping. In this contribution, we discuss the choices regarding the sample and detector stages and illustrate the potential of the new setups for extreme conditions studies based on selected preliminary results. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Spatial heterogeneity of KRAS mutations in colorectal cancers in northern France

Author

Turpin A, Genin M, Hebbar M, Occelli F, Lanier C, Vasseur F, Descarpentries C, Pannier D, and Ploquin A

Subjects
Colorectal Cancer, KRAS mutation, spatial scan statistics, carcinogens, highways, Neoplasms. Tumors. Oncology. Including cancer and carcinogens, RC254-282
Abstract

Anthony Turpin,1–3 Michael Genin,4 Mohamed Hebbar,1,2 Florent Occelli,5 Caroline Lanier,5 Francis Vasseur,4 Clotilde Descarpentries,6 Diane Pannier,7 Anne Ploquin1 1Medical oncology unit, Hôpital Claude Huriez, F-59000 Lille, France; 2Lille University Medical School, Université Lille Nord de France, Lille, France; 3University Lille, CNRS, Institut Pasteur de Lille, UMR 8161 - Mechanisms of Tumorigenesis and Target Therapies, F-59021 Lille, France; 4EA 2694-Santé Publique: épidémiologie et qualité des soins, University Lille, CHU Lille, 59000 Lille, France; 5EA 4483 - Impact de l’environnement chimique sur la santé humaine, University of Lille, 59000 Lille, France; 6Division of Biochemistry and Molecular Biology, Oncology and Molecular Genetics Laboratory, CHU Lille, Lille, France; 7Department of Medical Oncology, Centre Oscar Lambret, Lille, F-59000, FranceCorrespondence: Anthony TurpinMedical Oncology Unit, Hôpital Claude Huriez, Rue Michel Polonovski, Lille Cedex 59037, FranceTel +33 32 044 5461Fax +33 32 044 4381Email anthony.turpin@chru-lille.frBackground: Somatic mutations in the KRAS gene are the most common oncogenic mutations found in human cancers. However, no clinical features have been linked to KRAS mutations in colorectal cancer [CRC].Purpose: In this study, we attempted to identify the potential geographical population clusters of KRAS mutations in CRC patients in northern France.Patients and methods: All patients with CRC who were identified to have KRAS mutations between 2008 and 2014 at the Regional Molecular Biology Platform at Lille University Hospital were included. 2,486 patients underwent a KRAS status available, with 40.9% of CRC with KRAS mutations in northern France. We retrospectively collected demographic and geographic data from these patients. The proportions of KRAS mutation were smoothed to take into account the variability related to low frequencies and spatial autocorrelation. Geographical clusters were searched using spatial scan statistical models.Results: A mutation at KRAS codon 12 or 13 was found in 1,018 patients [40.9%]. We report 5 clusters of over-incidence but only one elongated cluster that was statistically significant [Cluster 1; proportion of KRAS mutation among CRC: 0.4570; RR=1.29; P=0.0314]. We made an ecological study which did not highlight a significant association between KRAS mutations and the distance to the Closest Waste Incineration Plant, and between KRAS mutations and The French Ecological Deprivation Index but few socio-economic and environmental data were available.Conclusion: There was a spatial heterogeneity and a greater frequency of KRAS mutations in some areas close to major highways and big cities in northern France. These data demand deeper epidemiological investigations to identify environmental factors such as air pollution as key factors in the occurrence of KRAS mutations.Keywords: colorectal cancer, KRAS mutation, spatial scan statistics, carcinogens, highways

Published
2019

13. Towards a dynamic compression facility at the ESRF

Author

Sévelin-Radiguet, N., Torchio, R., Berruyer, G., Gonzalez, H., Pasternak, S., Perrin, F., Occelli, F., Pépin, C., Sollier, A., (0000-0002-6350-4180) Kraus, D., (0000-0001-5489-5952) Schuster, A., (0000-0001-8090-2626) Voigt, K., Zhang, M., Amouretti, A., Boury, A., Fiquet, G., Guyot, F., Harmand, M., Borri, M., Groves, J., Helsby, W., Branly, S., Norby, J., Pascarelli, S., Mathon, O., Sévelin-Radiguet, N., Torchio, R., Berruyer, G., Gonzalez, H., Pasternak, S., Perrin, F., Occelli, F., Pépin, C., Sollier, A., (0000-0002-6350-4180) Kraus, D., (0000-0001-5489-5952) Schuster, A., (0000-0001-8090-2626) Voigt, K., Zhang, M., Amouretti, A., Boury, A., Fiquet, G., Guyot, F., Harmand, M., Borri, M., Groves, J., Helsby, W., Branly, S., Norby, J., Pascarelli, S., and Mathon, O.

Abstract

Results of the 2018 commissioning and experimental campaigns of the new High Power Laser Facility on the Energy-dispersive X-ray Absorption Spectroscopy (ED-XAS) beamline ID24 at the ESRF are presented. The front-end of the future laser, delivering 15 J in 10 ns, was interfaced to the beamline. Laser-driven dynamic compression experiments were performed on iron oxides, iron alloys and bismuth probed by online time-resolved XAS.

Published
2022

15. Association entre taux de polluants environnementaux et survenue d’asthme aigu de l’enfant dans la métropole lilloise

Author

Huet, L.A., primary, Deschildre, A., additional, Drumez, E., additional, Gosset, P., additional, Thumerelle, C., additional, Mordacq, C., additional, Pouessel, G., additional, Pichavant, M., additional, Engelmann, I., additional, Dessein, R., additional, Beghin, L., additional, Dubos, F., additional, Occelli, F., additional, Dauchet, L., additional, and Lejeune, S., additional

Published
2022
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18. Single-shot XAS on laser shock compressed Fe-rich alloys: Fe-Ni, Fe-Si and Fe oxides

Author

(0000-0001-8090-2626) Voigt, K., Amouretti, A., Sévelin-Radiguet, N., Torchio, R., Berruyer, G., Gonzalez, H., Pasternak, S., Perrin, F., Occelli, F., Pépin, C., Sollier, A., (0000-0001-5489-5952) Schuster, A., Zhang, M., Boury, A., Fiquet, G., Guyot, F., Harmand, M., Borri, M., Groves, J., Helsby, W., Pascarelli, S., Mathon, O., (0000-0002-6350-4180) Kraus, D., (0000-0001-8090-2626) Voigt, K., Amouretti, A., Sévelin-Radiguet, N., Torchio, R., Berruyer, G., Gonzalez, H., Pasternak, S., Perrin, F., Occelli, F., Pépin, C., Sollier, A., (0000-0001-5489-5952) Schuster, A., Zhang, M., Boury, A., Fiquet, G., Guyot, F., Harmand, M., Borri, M., Groves, J., Helsby, W., Pascarelli, S., Mathon, O., and (0000-0002-6350-4180) Kraus, D.

Abstract

Deep inside planets extreme material states can be found: pressures up to hundreds of GPa and temperatures up to thousands and ten thousands of K are common. From all planets, the Earth is most investigated, but open questions e.g. regarding the crystallographic structure and composition of the core material remain. The Earth’s core consists mostly of iron, supposedly in an alloy with a substantial amount of nickel. However, results from seismological studies suggest the presence of lighter elements (like H, C, O ,Si and S), too. Not only for geophysics but also for modelling terrestrial planets found in extrasolar systems, the study of the high-pressure high-temperature phase diagram of iron and its alloys is of importance. Bright X-ray sources in combination with high-power optical laser provide unique possibilities for creating and probing such extreme material states and their properties in the laboratory. In 2018, the High Power Laser Facility (HPLF) at the European Synchrotron Radiation Facility (ESRF) has started to be established. High quality X-ray absorption spectroscopy of dynamically compressed matter together with additional shock diagnostics will give insight into structural and electronic changes of the material as well as will give information about generated temperatures and pressures. This talk presents results from first commissioning experiments at this new outstanding facility, where laser shock compressed high-energy-density states of iron and its alloys with nickel and silicon have been investigated via single-shot X-ray absorption spectroscopy at the iron K edge.

Published
2021

19. White-line evolution in shocked solid Ta evidenced by synchrotron x-ray absorption spectroscopy

Author

Pépin, C. M., primary, Torchio, R., additional, Occelli, F., additional, Lescoute, E., additional, Mathon, O., additional, Recoules, V., additional, Bouchet, J., additional, Videau, L., additional, Benuzzi-Mounaix, A., additional, Vinci, T., additional, Briggs, R., additional, Pascarelli, S., additional, Gaal, R., additional, Loubeyre, P., additional, and Sollier, A., additional

Published
2020
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20. La verifica preventiva dell’interesse archeologico nella progettazione della Tratta 3 Collegno Cascine Vica della Linea 1 della Metropolitana Automatica di Torino. The preventive verification of archeological interest in the design of the Section 3. Collegno Cascine Vica of the Turin Automatic Metro Line 1

Author

Gianasso, E., Cudia, M., Crova, R., Bolognesi, F., and Occelli, F.

Subjects
ricerca archivistica, verifica preventiva di interesse archeologico, metodo, verifica preventiva di interesse archeologico, ricerca archivistica, metropolitana, metodo, metropolitana
Published
2020

21. Fine-scale geographic distribution and ecological studies of Crohn's disease in France (2007-2014)

Author

Génin, M., Fumery, Mathurin, Occelli, F., Savoye, G., Pariente, B., Dauchet, L., Vignal, C., Body-Malapel, M., Giovannelli, J., Sarter, H., Gower-Rousseau, C., Ficheur, G., Santé Publique : épidémiologie et qualité des soins (EA 2694), Faculté de Médecine Henri Warembourg - Université de Lille-Centre d'Etudes et de Recherche en Informatique Médicale [Lille] (CERIM), Université de Lille, CHU Amiens-Picardie, Périnatalité et Risques Toxiques - UMR INERIS_I 1 (PERITOX), Institut National de l'Environnement Industriel et des Risques (INERIS)-Université de Picardie Jules Verne (UPJV)-CHU Amiens-Picardie, Impact de l'environnement chimique sur la santé humaine - ULR 4483 (IMPECS), Université de Lille-Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille), Service d'Hépato-Gastroentérologie [CHU Rouen], Hôpital Charles Nicolle [Rouen], CHU Rouen, Normandie Université (NU)-Normandie Université (NU)-CHU Rouen, Normandie Université (NU)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), Registre EPIMAD, Normandie Université (NU)-Normandie Université (NU)-CHU Amiens-Picardie-Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille), Hôpital Claude Huriez [Lille], CHU Lille, Facteurs de Risque et Déterminants Moléculaires des Maladies liées au Vieillissement - U 1167 (RID-AGE), Institut Pasteur de Lille, Réseau International des Instituts Pasteur (RIIP)-Réseau International des Instituts Pasteur (RIIP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lille-Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille), Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille), Service d'Epidémiologie et de Santé Publique [Lille], Lille Inflammation Research International Center - U 995 (LIRIC), Troubles cognitifs dégénératifs et vasculaires - U 1171 - EA 1046 (TCDV), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lille, Droit et Santé-Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille), Troubles cognitifs dégénératifs et vasculaires - U 1171 (TCDV), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lille-Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille), and DESSAIVRE, Louise

Subjects
[SDV] Life Sciences [q-bio], [SDV.SPEE] Life Sciences [q-bio]/Santé publique et épidémiologie, [SDV]Life Sciences [q-bio], [SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie
Abstract

Poster n° 741; International audience; BackgroundA significant geographical variation in the incidence of Crohn's disease (CD) suggests the role of environmental factors in its pathogenesis. The objectives of this work were (i) to study the spatial distribution of CD cases in France from the database of the Programme de Médicalisation des Systèmes d'Information (PMSI), (ii) to study the factors associated with spatial heterogeneity and (iii) to identify clusters of high-prevalence.MethodsPatients with a CD diagnostic code were searched in the PMSI database between 2007 and 2014. To study the spatial distribution of prevalence for this period, a fine-scale spatial unit (5610 units at the national level) was used. The results were expressed as standardised prevalence ratio (SPR). An ecological regression measured the association between the risk of CD and spatial unit characteristics, such as access to the nearest reference centre, urbanisation and rurality, deprivation index (FDep index), latitude, and distance from polluting facilities. Elliptical spatial scan statistics were used to search high-prevalence clusters.Results A total of 129089 patients with CD have been identified, with a national prevalence in 2014 of 203/100000 inhabitants. Significant spatial Geographical distribution of age-and-gender Standardised Prevalence Ratios of Crohn’s disease in France, 2007–2014. Conclusions: The French geographical distribution of CD is not uniformly distributed. Sixteen clusters with high-risk of CD have been identified. The poorest populations and industrialised areas were associated with a higher risk of developing CD.

Published
2019
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22. A generic method for improving the spatial interoperability of medical and ecological databases

Author

Ghenassia, A., Beuscart, J. B., Ficheur, G., Occelli, F., Babykina, E., Chazard, E., Genin, M., Evaluation des technologies de santé et des pratiques médicales - ULR 2694 (METRICS), Université de Lille-Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille), Impact de l'environnement chimique sur la santé humaine - ULR 4483 (IMPECS), Santé publique : épidémiologie et qualité des soins-EA 2694 (CERIM), Impact de l'environnement chimique sur la santé humaine (IMPECS), Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille)-Université de Lille, CHU Lille, Institut Pasteur de Lille, Université de Lille, Evaluation des technologies de santé et des pratiques médicales - ULR 2694 [METRICS], METRICS : Evaluation des technologies de santé et des pratiques médicales - ULR 2694, IMPact de l'Environnement Chimique sur la Santé humaine (IMPECS) - EA 4483, and Impact de l'environnement chimique sur la santé humaine - ULR 4483 [IMPECS]

Subjects
Databases, Factual, Ecological and Environmental Phenomena, Geographic Mapping, Data reuse, Interoperability, Change-of-support problem, Spatial analysis, lcsh:Computer applications to medicine. Medical informatics, Humans, Birth Rate, [STAT.AP]Statistics [stat]/Applications [stat.AP], Spatial Analysis, [INFO.INFO-DB]Computer Science [cs]/Databases [cs.DB], Methodology, lcsh:R858-859.7, [SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie, France
Abstract

Background The availability of big data in healthcare and the intensive development of data reuse and georeferencing have opened up perspectives for health spatial analysis. However, fine-scale spatial studies of ecological and medical databases are limited by the change of support problem and thus a lack of spatial unit interoperability. The use of spatial disaggregation methods to solve this problem introduces errors into the spatial estimations. Here, we present a generic, two-step method for merging medical and ecological databases that avoids the use of spatial disaggregation methods, while maximizing the spatial resolution. Methods Firstly, a mapping table is created after one or more transition matrices have been defined. The latter link the spatial units of the original databases to the spatial units of the final database. Secondly, the mapping table is validated by (1) comparing the covariates contained in the two original databases, and (2) checking the spatial validity with a spatial continuity criterion and a spatial resolution index. Results We used our novel method to merge a medical database (the French national diagnosis-related group database, containing 5644 spatial units) with an ecological database (produced by the French National Institute of Statistics and Economic Studies, and containing with 36,594 spatial units). The mapping table yielded 5632 final spatial units. The mapping table’s validity was evaluated by comparing the number of births in the medical database and the ecological databases in each final spatial unit. The median [interquartile range] relative difference was 2.3% [0; 5.7]. The spatial continuity criterion was low (2.4%), and the spatial resolution index was greater than for most French administrative areas. Conclusions Our innovative approach improves interoperability between medical and ecological databases and facilitates fine-scale spatial analyses. We have shown that disaggregation models and large aggregation techniques are not necessarily the best ways to tackle the change of support problem. Electronic supplementary material The online version of this article (doi:10.1186/s12942-017-0109-5) contains supplementary material, which is available to authorized users.

Published
2017
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23. A microsecond time resolved x-ray absorption near edge structure synchrotron study of phase transitions in Fe undergoing ramp heating at high pressure.

Author

Marini, C., Occelli, F., Mathon, O., Torchio, R., Recoules, V., Pascarelli, S., and Loubeyre, P.

Subjects
*X-ray absorption near edge structure, *X-ray absorption, *SYNCHROTRON radiation, *PHASE transitions, *IRON, *COMPUTER simulation
Abstract

We report a microsecond time-resolved x-ray absorption near edge structure study using synchrotron radiation to dynamically detect structural phase transitions in Fe undergoing rapid heating along a quasi-isochoric path. Within a few ms, we observed two structural phase transitions, which transform the ambient bcc phase of Fe into the fcc phase, and then into the liquid phase. This example illustrates the opportunities offered by energy dispersive x-ray absorption spectroscopy in the study of matter under extreme dynamic conditions. Advanced simulations are compared to these data. [ABSTRACT FROM AUTHOR]

Published
2014
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26. Phonon dispersion curves determination in (delta)-phase Pu-Ga alloys

Author

Wong, J, primary, Clatterbuck, D, additional, Occelli, F, additional, Farber, D, additional, Schwartz, A, additional, Wall, M, additional, Boro, C, additional, Krisch, M, additional, Beraud, A, additional, Chiang, T, additional, Xu, R, additional, Hong, H, additional, Zschack, P, additional, and Tamura, N, additional

Published
2006
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28. CVD diamond detector with interdigitated electrode pattern for time-of-flight energy-loss measurements of low-energy ion bunches

Author

Cayzac, W., primary, Pomorski, M., additional, Blažević, A., additional, Canaud, B., additional, Deslandes, D., additional, Fariaut, J., additional, Gontier, D., additional, Lescoute, E., additional, Marmouget, J. G., additional, Occelli, F., additional, Oudot, G., additional, Reverdin, C., additional, Sauvestre, J. E., additional, Sollier, A., additional, Soullié, G., additional, Varignon, C., additional, and Villette, B., additional

Published
2018
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30. Mechanism of the alpha-epsilon phase transformation in iron

Author

Dewaele, A., Denoual, C., Simone Anzellini, Occelli, F., Mezouar, M., Cordier, P., Merkel, S., Véron, M., Rauch, E., DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département de Physique Théorique et Appliquée (DPTA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction des Applications Militaires (DAM), European Synchrotron Radiat. Facil., Université Joseph Fourier - Grenoble 1 (UJF), Unité Matériaux et Transformations - UMR 8207 (UMET), Institut de Chimie du CNRS (INC)-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL), Science et Ingénierie des Matériaux et Procédés (SIMaP), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut National de la Recherche Agronomique (INRA), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), and Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.MATE]Chemical Sciences/Material chemistry
Abstract

International audience; The alpha-Fe is an element of-Fe pressure-induced transformation under pure hydrostatic static compression has been characterized with in situ x-ray diffraction using alpha-Fe single crystals as starting samples. The forward transition starts at 14.9 GPa, and the reverse at 12 GPa, with a width of alpha-is an element of coexistence domain of the order of 2 GPa. The elastic stress in the sample increases in this domain, and partially relaxes after completion of the transformation. Orientation relations between parent alpha-Fe and child is an element of-Fe have been determined, which definitely validates the Burgers path for the direct transition. On the reverse transition, an unexpected variant selection is observed. X-ray diffraction data, complemented with ex situ microstructural observations, suggest that this selection is caused by defects and stresses accumulated during the direct transition.

Published
2015
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31. Structure and magnetism of cobalt at high pressure and low temperature

Author

Torchio, R., Marini, C., Kvashnin, Yaroslav O., Kantor, I., Mathon, O., Garbarino, G., Meneghini, C., Anzellini, S., Occelli, F., Bruno, P., Dewaele, A., Pascarelli, S., Torchio, R., Marini, C., Kvashnin, Yaroslav O., Kantor, I., Mathon, O., Garbarino, G., Meneghini, C., Anzellini, S., Occelli, F., Bruno, P., Dewaele, A., and Pascarelli, S.

Abstract

The magnetic and structural properties of cobalt were investigated under high pressure (160 GPa) and low temperature (50 K), by synchrotron K-edge x-ray magnetic circular dichroism and x-ray diffraction. A quasihydrostatic equation of state was measured up to 160 GPa. We found that uniaxial stress plays a role in the hexagonal close packed-face centered cubic (hcp-fcc) structural transition pressure. Also, our data provide the first experimental evidence that changes of the c/a ratio pressure derivative are related to the magnetic behavior. The complete extinction of ferromagnetism is observed above 130 GPa in a mixed hcp-fcc phase with no recovery upon cooling to 50 K, indicating that cobalt at 150 GPa is very likely nonmagnetic, i.e., characterized by zero local spin polarization. Density functional theory calculations point out that the K-edge x-ray magnetic circular dichroism (XMCD) signal is related to the 4p orbital moment rather than to the total spin moment and allow us to get a deeper insight into the K-edge XMCD measurements interpretation. The combination of novel theoretical results and experimental outputs provides a detailed scenario of the structural and magnetic properties of cobalt at these extreme conditions answering some previously unsolved issues.

Published
2016
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35. Archeologia urbana a Ventimiglia: interventi di tutela e nuove acquisizioni scientifiche

Author

Cagnana, Aurora, Bracco, C., Gandolfi, D., Mastrantuono, C., Occelli, F., Palmero, Giuseppe, Pampararo, C., Laboratoire d'Archéologie Médiévale et Moderne en Méditerranée (LA3M), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), and Musacchia, Sandrine

Subjects
[SHS.ARCHEO] Humanities and Social Sciences/Archaeology and Prehistory, [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory, Archeologia urbana, ComputingMilieux_MISCELLANEOUS, Ventimiglia
Abstract

National audience

Published
2013

36. Castel d’Appio. Interventi di archeologia preventiva (Ventimiglia)

Author

Cagnana, Aurora, Occelli, F., Laboratoire d'Archéologie Médiévale et Moderne en Méditerranée (LA3M), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), and Musacchia, Sandrine

Subjects
[SHS.ARCHEO] Humanities and Social Sciences/Archaeology and Prehistory, [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory, Appio
Published
2013

37. Diffusionless $\gamma$⇄$\alpha$ phase transition in polycrystalline and single-crystal cerium

Author

Decremps, F., Belhadi, L., L. Farber, D., T. Moore, K., Occelli, F., Gauthier, Mélanie, Polian, A., Antonangeli, D., M. Aracne-Ruddle, C., Amadon, B., Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), Lawrence Livermore National Laboratory (LLNL), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and ANR-08-BLAN-0109,apicoced,Propriétés des métaux sous conditions extrêmes. Le point de vue de l'Acoustique par mesures PICOseconde en Cellule à Enclumes de Diamant(2008)

Subjects
PACS : 64.60.F, 64.30.Ef, 64.70.K, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
Abstract

International audience; The cerium $\gamma$⇄$\alpha$ transition was investigated using high-pressure, high-temperature angle-dispersive xray diffraction measurements on both poly- and single-crystalline samples, explicitly addressing symmetry change and transformation paths. The isomorphic hypothesis of the transition is confirmed, with a transition line ending at a solid-solid critical point. The critical exponent is determined, showing a universal behavior that can be pictured as a liquid-gas transition. We further report an isomorphic transition between two single crystals (with more than 14% of volume difference), an unparalleled observation in solid-state matter interpreted in terms of dislocation-induced diffusionless first-order phase transformation

Published
2011
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38. Watching a metal collapse: Examining cerium's cM a transformation using X-ray diffraction of compressed single and polycrystals

Author

Moore, K.T., Belhadi, L., Decremps, F., Farber, D.L., Bradley, J.A., Occelli, F., Gauthier, Michel, Polian, A., Aracne-Ruddle, C.M., Lawrence Livermore National Laboratory (LLNL), Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Centre National de la Recherche Scientifique (CNRS), Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), and Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], Condensed Matter::Materials Science, High pressure, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Rare earth, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Cerium, Phase transformation, X-ray diffraction
Abstract

International audience; Numerous investigations have been performed on Ce metal since the discovery of the c !a phase transformation, where a face-centered cubic structure is believed to collapse isostructurally with a volume change of 17%. However, two questions have yet to be answered definitively. First, is the transformation truly isostructural or is the face-centered cubic structure lost in a-Ce due to symmetry breaking? Second, if the transformation is isostructural does the face-centered cubic structure stay in crystallographic orientation through the volume collapse? Here, we use high-pressure and high-temperature X-ray diffraction measurements to examine single and polycrystalline samples of Ce in the vicinity of the c M a transformation. This was achieved by successive continuous compression and decompression in a diamond anvil cell at temperatures under, at and above the critical point. Our results show that the crystal structure remains face-centered cubic for both the c and a phases. The results also show that the face-centered cubic structure retains its crystallographic orientation, simply reducing in volume during the c! a phase transformation. Upon transformation to a, polycrystalline samples show increased diffraction peak broadening, while single crystals show increased streaking. These changes in diffraction can be attributed to increased damage and lattice misorientation from the transformation. Using a simple atomic lattice model, we show that a periodic array of misfit edge dislocation is necessary to accommodate the large volume difference at the c-a interface and this could act as a source of the edge dislocations needed to produced previously observed deformation bands.

Published
2011

41. Microstructural investigation of laser-shocked iron oils

Author

Guillaume Morard, Rességuier, T., Bennuzi-Mounaix, A., Vinci, T., Lescoute, E., Brambrink, E., Koenig, M., Wei, H., Diziere, A., Occelli, F., Fiquet, G., Guyot, F., European Synchrotron Radiation Facility ( ESRF ), Laboratoire de combustion et de détonique ( LCD ), Centre National de la Recherche Scientifique ( CNRS ), Laboratoire pour l'utilisation des lasers intenses ( LULI ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -École polytechnique ( X ) -Université Paris-Saclay-Centre National de la Recherche Scientifique ( CNRS ), Earth Science Division, Energy and Environment Directorate, Lawrence Livermore National Laboratory, Lawrence Livermore National Laboratory ( LLNL ), Institut de Physique du Globe de Paris ( IPGP ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -IPG PARIS-Université Paris Diderot - Paris 7 ( UPD7 ) -Université de la Réunion ( UR ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de minéralogie et de physique des milieux condensés ( IMPMC ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -IPG PARIS-Université Paris Diderot - Paris 7 ( UPD7 ) -Centre National de la Recherche Scientifique ( CNRS ), European Synchrotron Radiation Facility (ESRF), Laboratoire de combustion et de détonique (LCD), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS), Laboratoire pour l'utilisation des lasers intenses (LULI), Université Pierre et Marie Curie - Paris 6 (UPMC)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Lawrence Livermore National Laboratory (LLNL), Institut de Physique du Globe de Paris (IPGP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[ SPI.MECA ] Engineering Sciences [physics]/Mechanics [physics.med-ph], [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2009

43. High-pressure high-temperature equation of state of KCl and KBr

Author

Dewaele, A., Belonoshko, Anatoly B., Garbarino, G., Occelli, F., Bouvier, P., Hanfland, M., Mezouar, M., Dewaele, A., Belonoshko, Anatoly B., Garbarino, G., Occelli, F., Bouvier, P., Hanfland, M., and Mezouar, M.

Abstract

The equation of state of KCl and KBr, compressed in a helium pressure medium in a diamond-anvil cell, has been measured by x-ray diffraction in the B1 and B2 phases up to 165 GPa at 298 K. The P-V-T of B2 KCl and B2 KBr has been calculated by ab initio molecular dynamics in a wide compression range and up to 7000 K. The thermal pressure exhibits a linear behavior with temperature and remains low under high compression. The experimental P-V points and the thermal pressure calculated by molecular dynamics have been used to set up a high-pressure high-temperature equation of state of B2 KCl and B2 KBr. With these equations of state, B2 KCl and B2 KBr can be used as pressure markers in laser-heated diamond-anvil-cell experiments., QC 20120703

Published
2012
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49. High-power laser shock-induced dynamic fragmentation of iron foils

Author

Morard, G., primary, de Rességuier, T., additional, Vinci, T., additional, Benuzzi-Mounaix, A., additional, Lescoute, E., additional, Brambrink, E., additional, Koenig, M., additional, Wei, H., additional, Diziere, A., additional, Occelli, F., additional, Fiquet, G., additional, and Guyot, F., additional

Published
2010
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50. MICROSTRUCTURAL INVESTIGATION OF LASER-SHOCKED IRON FOILS

Author

Morard, G., primary, de Rességuier, T., additional, Benuzzi-Mounaix, A., additional, Vinci, T., additional, Lescoute, E., additional, Brambrink, E., additional, Koenig, M., additional, Wei, H., additional, Diziere, A., additional, Occelli, F., additional, Fiquet, G., additional, Guyot, F., additional, Elert, Mark, additional, Furnish, Michael D., additional, Anderson, William W., additional, Proud, William G., additional, and Butler, William T., additional

Published
2009
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