Author: "Fournier, Axel" / Language: english - Searchworks@Jio Institute Digital Library Search Results

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Author: Fournier, Axel, Guenni, Malek, Morell-Moratal, Carles, Raiu, Nicolae-Emmanuel, Andrei, Irina-Carmen, Ştefan, Adriana, Pelin, Cristina, Stoica, Gina Florica, Crişan, Nicoleta, Prisecaru, Delia, Stoica, Cristian, Greculescu, Anca, Boşbrcoianu, Corina-Elena, and Costea, Emil
Subjects: *AEROSPACE industry research, *LIGHT aircraft, *WHEELS, *COMPOSITE materials, *RESEARCH institutes, *STUDENT projects
Abstract: This paper presents the results of the research stage focused on applications of composite materials in aviation, carried on by an international team of European Project Semester students at the National Institute for Aerospace Research "Elie Carafoli" – INCAS, as Research Partner of the University POLTEHNICA of Bucharest, as Organizer and EUROPEAN PROJECT SEMESTER Provider. The study case is a light aircraft wheel cover. The objectives are set to the laboratory experiments in case of a light aircraft composite wheel cover. [ABSTRACT FROM AUTHOR]
Published: 2024
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Author: Fournier, Axel, Guenni, Malek, Morell-Moratal, Carles, Raiu, Nicolae-Emmanuel, Andrei, Irina-Carmen, Ştefan, Adriana, Pelin, Cristina, Stoica, Gina Florica, Crişan, Nicoleta, Prisecaru, Delia, Stoica, Cristian, Greculescu, Anca, Boşcoianu, Corina-Elena, and Costea, Emil
Subjects: *REVERSE engineering, *COMPUTER simulation, *AEROSPACE industry research, *LIGHT aircraft, *THREE-dimensional printing, *RESEARCH institutes, *COMPOSITE construction
Abstract: This paper presents the results of the research stage focused on applications of composite materials in aviation, carried on by an international team of European Project Semester students at the National Institute for Aerospace Research "Elie Carafoli" – INCAS, as Research Partner of the University POLTEHNICA of Bucharest, as Organizer and EUROPEAN PROJECT SEMESTER Provider. The study case is a light aircraft wheel cover. The objectives are set to the determination of the body geometry by reverse engineering techniques, modeling and numerical simulations for aerodynamics and structural analysis. A scale reduced demonstrator was obtained through 3D printing. [ABSTRACT FROM AUTHOR]
Published: 2024
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Author: Romiguier, Jonathan, Fournier, Axel, Yek, Sze Huei, and Keller, Laurent
Subjects: *HARVESTER ants, *ANT reproduction, *ANIMAL sexual behavior, *PROTEOMICS, *SOCIAL evolution
Abstract: Sexual reproduction generally requires no more than two partners. Here, we show convergent evolution of social hybridogenesis, a reproductive system requiring three reproductive partners in harvester ants. In this unorthodox reproductive system, two distinct genetic lineages live in sympatry and queens have to mate with males of their own lineage to produce queens along with males of the alternative lineage to produce workers. Using a large transcriptomic data set of nine species, we show that social hybridogenesis evolved at least three times independently in the genus Messor. Moreover, a study of 13 populations of Messor barbarus revealed that this mode of reproduction is fixed in the whole range of this ecologically dominant species. Finally, we show that workers can produce males carrying genes of the two genetic lineages, raising the possibility of rare gene flow between lineages contributing to the long-term maintenance of pairs of interdependent lineages. These results emphasize the evolutionary importance of social hybridogenesis, a major transition possibly linked to the peculiar ecology of harvester ants. [ABSTRACT FROM AUTHOR]
Published: 2017
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