Auswahl der wissenschaftlichen Literatur zum Thema „Agrégats légers“
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Zeitschriftenartikel zum Thema "Agrégats légers"
Bazin, D., R. Revel, H. Dexpert, E. Elkaim, J. P. Lauriat, F. Garin, F. Maire, L. Guczi und G. Lu. „Aspects complémentaires entre la spectroscopie d'absorption X et la diffraction anomale dans le cas d'entités de taille nanométrique supportés sur un oxyde léger : agrégats métalliques et oxyde de type spinelle“. Le Journal de Physique IV 08, PR5 (Oktober 1998): Pr5–263—Pr5–269. http://dx.doi.org/10.1051/jp4:1998533.
Der volle Inhalt der QuelleColas, L., J. F. Budzik, M. Toledano, L. Norberciak und S. Verclytte. „Etude TC3A : Évaluation de l’intérêt des scanners cérébraux pour traumatisme crânien léger chez les patients sous anti-agrégants plaquettaires, anticoagulants et anticoagulants oraux directs : Étude prospective chez 847 patients“. Journal of Neuroradiology 46, Nr. 2 (März 2019): 79. http://dx.doi.org/10.1016/j.neurad.2019.01.079.
Der volle Inhalt der QuelleJustino, Lucas Diego de Souza. „Faisabilité de l’utilisation des cendres de chaudière industrielle dans le dosage du béton structurel“. Revista Científica Multidisciplinar Núcleo do Conhecimento, 10.09.2021, 81–97. http://dx.doi.org/10.32749/nucleodoconhecimento.com.br/travaux-publics/beton-structurel.
Der volle Inhalt der QuelleDissertationen zum Thema "Agrégats légers"
Dell'aquila, Daniele. „Clustering dans les noyaux légers : une approche multi-méthodique“. Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS093/document.
Der volle Inhalt der QuelleClustering phenomena characterise several fields of natural sciences and sociology. They consist on the self-organisation of groups of objects in correlated sub-groups, introducing symmetries and, in some cases, a certain degree of order in the overall system. In nuclear physics, these aspects represent one of the most fascinating effects induced by the Pauli principle in nuclei. Their investigation is an extremely powerful tool to understand the behaviour of nuclear forces in N-body interacting systems. In this thesis, I discuss the results of an experimental campaign that explores clustering aspects in light nuclear systems from a multi-methodic approach and by using different and complementary techniques.The work start with the 10Be nucleus, predicted to be constituted by a molecular cluster structure of two alpha particles kept bound by the two extra valence neutrons. The experiment has been performed with 10Be beams produced at the INFN-LNS laboratory with the FRIBs projectile fragmentation technique. By means of particle-particle correlation techniques, signals of a new state possibly belonging to the 10Be molecular rotational band were observed. Other nuclei along the carbon isotopic chain were also investigated to understand how clustering phenomena evolve with neutron excess. For 11C and 13C we used 10B(p,alpha) and 9Be(alpha,alpha) nuclear reactions, respectively, at low energies. These measurements were made at the tandem accelerator in Naples. Measured Differential cross sections and angular distributions, together with other data available in the literature, were reproduced by R-matrix calculations, which allowed us to refine the spectroscopy of such nuclei and suggest the existence of cluster states, possibly members of molecular rotational bands. The 16C nucleus was investigated with the same setup used in the 10Be case with a very intense secondary beam. I have observed non vanishing yields in both two-body and three-body cluster disintegration channels for 16C which represent extremely rare decays. Finally, the Hoyle state in 12C (7.654 MeV, 0+) was investigated in a high-precision experiment by using the 14N(d,a) reaction at 10.5 MeV at INFN-LNS. The study has provided an upper limit to the direct three-alpha decay process of such state with an unprecedented precision. This result, which improves of a factor 5 the existing state of the art, provides important constraint to theoretical structure models as well as to stellar nucleosynthesis calculations aiming at revealing the origin of elements in the universe. Clustering phenomena have also been studied in 19F and 20Ne nuclei with the 19F(p,a) reaction at very low energies at the AN-2000 accelerator of the INFN-LNL. An R-matrix analysis of the integrated cross-section was used to provide information on the structure of the 20Ne compound nucleus with its astrophysical implications on the CNO cycle in stars.I have also used heavy ion collisions at intermediate energies to explore clustering phenomena in dilute and hot nuclear matter. I have developed a thermal model of particle-particle correlations whit the aim of describing the population of decaying unbound states produced during the evolution of violent Ar+Ni collisions at 32-95 MeV per nucleon. The limitations of a purely thermal approach in such a dynamical system have been discussed, with possible ideas to explain the mechanism which populate internal states in 8Be cluster states accounting for the interplay of thermodynamics with final state interaction effects. Such studies are relevant to model cluster formation in nuclear matter
Farizon-Mazuy, Bernadette. „Echange de charge et excitation dans des feuilles minces amorphes ou cristallines d'ions atomiques légers (80-600 KeV-u), d'agrégats d'hydrogène (30-120 KeV-u) et d'ions Xe canalisés (25 MeV-u)“. Phd thesis, Université Claude Bernard - Lyon I, 1987. http://tel.archives-ouvertes.fr/tel-00747323.
Der volle Inhalt der QuelleEl, boukhari Mohamed. „« Analyse expérimentale du comportement mécanique et thermiqued'un béton et d'un mortier allégés par des grignons d'olives : Application au bâtiment »“. Electronic Thesis or Diss., Reims, 2023. http://www.theses.fr/2023REIMS040.
Der volle Inhalt der QuelleThe management of agricultural waste and the promotion of sustainable building materials offer many considerable benefits. By integrating sustainable practices into the construction sector, we have the ability to reduce our ecological footprint by limiting the excessive exploitation of natural resources. The research conducted in this study aims to develop a lightweight structural concrete and cement mortar using organic olive pomace aggregates. Two types of aggregates were used, depending on whether they were mixed with or without olive mill wastewater. The main objective of this study is to experimentally evaluate the mechanical and thermal properties of lightened concrete and mortar specimens in comparison with ordinary concrete and mortar specimens. They were prepared using dry and saturated olive pomace aggregates, with a percentage substitution of natural sand ranging from 0% to 15%. The results showed that the optimal formulation for producing lightweight concrete consists of 5% dry olive pomace aggregates mixed with olive mill wastewater. This formulation offers better mechanical properties, including a compressive strength of 25 MPa, a tensile strength of 4.61 MPa, and a dynamic modulus of elasticity of 44.39 GPa. Additionally, the resulting material has a reduced dry bulk density, leading to a decrease of approximately 5.69% compared to the reference concrete. For cement mortar, the best results were obtained with a mixture containing 5% dry olive pomace aggregates mixed with olive mill wastewater. The results showed a marginal effect on compressive strength (Rc), reaching 33.50 MPa after 28 days of curing. However, for both concrete and mortar, microstructural analysis revealed weak adhesion between olive pomace aggregates and the cement matrix at the Interfacial Transition Zone. Experimental tests also showed that increasing the content of olive pomace aggregates reduces the ultrasound propagation velocity and the dynamic modulus of elasticity of lightweight concrete and mortar, as well as their workability, while increasing their porosity.As regards the thermal properties of the developed materials, the incorporation of olive pomace aggregates led to an improvement in thermal resistance. In the case of lightweight concrete with 5% of dry olive pomace aggregates mixed with olive mill wastewater, the thermal conductivity (λ) decreased from 1.3 W/m·K (for the control specimen) to 0.86 W/m·K. In the case of cement mortar containing 5% of dry olive pomace aggregates mixed with olive mill wastewater, the thermal conductivity (λ) decreased from 1.1 W/m·K (control specimen) to 0.87 W/m·K. In conclusion, this study revealed that the materials developed and tested under laboratory conditions meet the required standards for general use in construction