Literatura académica sobre el tema "Electrons de très haute énergie"
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Artículos de revistas sobre el tema "Electrons de très haute énergie"
Hurel, Tristan. "Comprendre les déterminants de la désinformation scientifique aujourd’hui". Revue Générale Nucléaire, n.º 1 (enero de 2018): 28–31. http://dx.doi.org/10.1051/rgn/20181028.
Texto completoMora, P. "Utilisation des plasmas pour l'accélération de particules à très haute énergie". Revue de Physique Appliquée 23, n.º 9 (1988): 1489–94. http://dx.doi.org/10.1051/rphysap:019880023090148900.
Texto completoHamelin, B., P. Bastie, D. Richard y A. Eiaazzouzi. "Imagerie 2D et 3D de matériaux monocristallins : topographie et tomographie en diffraction rayons X de très haute énergie". Journal de Physique IV (Proceedings) 118 (noviembre de 2004): 437–46. http://dx.doi.org/10.1051/jp4:2004118051.
Texto completoSAUVEUR, B., D. ROUSSELOT-PAILLEY y P. LARRUE. "Alimentation énergétique de l’oie reproductrice". INRAE Productions Animales 1, n.º 3 (11 de julio de 1988): 209–14. http://dx.doi.org/10.20870/productions-animales.1988.1.3.4454.
Texto completoCholewka, C., F. Friso y M. Politi. "L’usage des diètes en médecine traditionnelle amazonienne : implications pour une nouvelle phytothérapie". Phytothérapie 18, n.º 3-4 (30 de agosto de 2019): 169–79. http://dx.doi.org/10.3166/phyto-2019-0181.
Texto completoMichel, Peter, Roche, Vermeulen y Morel. "Primary Surgical Care of Pelvic Fractures Associated to a Perineal Laceration". Swiss Surgery 5, n.º 1 (1 de febrero de 1999): 33–37. http://dx.doi.org/10.1024/1023-9332.5.1.33.
Texto completoPEYRAUD, J. L. y L. DELABY. "Utilisation de luzerne déshydratée de haute qualité dans les rations des vaches laitières". INRAE Productions Animales 7, n.º 2 (24 de abril de 1994): 125–34. http://dx.doi.org/10.20870/productions-animales.1994.7.2.4163.
Texto completoLouppe, Dominique. "Plantations forestières : un sujet d'actualité ? [Editorial]". BOIS & FORETS DES TROPIQUES 309, n.º 309 (1 de septiembre de 2011): 4. http://dx.doi.org/10.19182/bft2011.309.a20465.
Texto completoAL AGHA, Khaldoun. "Green Communications : réseaux low cost très économes en énergie et de haute qualité de service". Innovations technologiques, julio de 2012. http://dx.doi.org/10.51257/a-v1-in152.
Texto completoTesis sobre el tema "Electrons de très haute énergie"
Lemière, Anne. "Electrons reliques de très haute énergie dans les nébuleuses de pulsar : étude et identification d'une population de sources gamma du TeV avec H.E.S.S". Paris 7, 2006. http://www.theses.fr/2006PA077181.
Texto completoThe HESS experiment (High Energy Stereoscopic System) consist of four imaging atmospheric Cherenkov telescopes to study southern hemisphere astrophysical sources above 100 GeV. The first part of this thesis studies the extended sources observed along the Galactic plane with this instrument. A multi-resolution analysis based on wavelets has been adapted to the VHE (Very high Energy) data for a better study of morphology, and has been tested on Monte Carlo simulations. A rnorphological and spectral analysis has allowed the selection of sources with a powerful spatially-coincident pulsar and to make a list of pulsar wind nebulae candidates based on energetic criteria. The second part of this thesis investigates the origine of the asymmetric morphology of the nebulae by studying the interstellar medium and show that a majority of the PWN candidates have a matter gradient near the pulsar position which is compatible with the hypothesis of an asymmetric reverse shock. Finally, an energy-dependant morphological analysis is applied to HESS J1825-137, the archetypal VHE PWN, and reveals high-energy electrons near the pulsar and a hardening of the spectral index far from it : we propose to model this source with a time-dependent spectral rnodelling. This model reproduces very well the data with reasonable parameters. It allow us for the first time to constrain the time evolution of the magnetic field in a PWN together with the initial characteristics of the pulsar, and confirms the presence of relic electons in
Ronga, Maria Grazia. "Study and modelling of very high energy electrons (VHEE) radiation therapy". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPAST036.
Texto completoThe development of innovative methods capable of reducing the sensitivity of healthy tissue to radiation, while maintaining the effectiveness of the treatment on the tumour, is a central aspect of improving the effectiveness of radiotherapy in the treatment of cancer. Among possible developments and methodological innovations, the combination of ultra-high dose rate irradiation (FLASH) and very high energy electrons (VHEE) could make it possible to exploit the radiobiological advantages of the FLASH effect for the treatment of deep tumours. In particular, VHEEs in the 100 to 250 MeV energy range would be particularly interesting from a ballistic and biological point of view for the application of FLASH irradiation in radiotherapy. This thesis therefore studies the possible use of VHEEs in radiotherapy, and in particular their use at ultra-high dose rates, thus assessing the feasibility of FLASH-VHEE radiotherapy. Although promising, several aspects of this technique need to be studied before it can be used in a clinical context. The first part of this work studies the machine parameters required to meet the constraints of FLASH irradiation. To this end, an analytical model for calculating the dose based on Fermi-Eyges multiple scattering theory was developed and tested. This analytical model has also been used to design and optimise a double-scattering system for VHEE therapy, in order to obtain field sizes greater than 15x15 cm², and to assess the possible adaptation of conventional particle beam conformation methods for FLASH-VHEE therapy. The second part of this work focuses on VHEE treatment planning and the evaluation of clinical plans. Four representative clinical cases were studied, for which pencil-beam scanning (PBS) and double scattering (DS) treatment plans were calculated. The influence of beam energy on plan quality was studied and the PBS and DS techniques were compared. A temporal description of the irradiation was also carried out, as well as the incorporation of a FLASH modification factor when evaluating the plan and its effect on healthy tissue in FLASH mode. Finally, the estimation of doses from secondary particles and radiation protection issues were addressed. A calculation of the secondary dose due to Bremsstrahlung photons and neutrons from the two dose delivery systems was developed in water. The secondary particle dose received by various organs was also assessed in the context of intracranial treatments and in order to demonstrate the advantage of VHEE beams over proton beams in terms of out-of-field neutron dose. In summary, the fast analytical models parameterised in this study allow the dose distribution produced by a VHEE system to be estimated with good accuracy, providing important information for the potential design of a VHEE system. The results of this work could support the development of FLASH-VHEE radiotherapy
Mattei, Alvise. "Rayons cosmiques de très haute énergie : vers une nouvelle astronomie". Chambéry, 2006. http://www.theses.fr/2006CHAMS029.
Texto completoCosmic rays play an important role in the history of Physics, since more tan a century. Their spectrum extends by more than 10 orders of magnitude. The cosmic background radiation constrains the propagation distance and defines the class of Ultra High Energy Cosmic Rays (UHECR) which carry energy well beyond the pion production threshold, called cutoff GZK. Several experiments studied the UHECR to understand their nature and origin. The general aspects of this problems are analyzed in a critical flavor. I describe a method for the reconstruction of UHECR trajectories within the local universe, starting from the Galactic Magnetic Field (GMF). My code is able to back-propagate charged particles in a magnetic field. To determine the extragalactic magnetic field, I used a local universe map, taken from the catalog HyperLEDA. To verify the effects of these fields on UHECR trajectories, I back-propagate a beam of 40000 protons, 1 degree wide, towards the direction of Virgo cluster. The mean deviation is 0. 780. And grows up to 1. 30 for a frozen field model. These values are not negligible. I applied the same method to the triple event of AGASA experiment, added of a fourth event from HiRes. Through the plausible sources, I identified NGC3998, an Active Galactic Nucleus, of LINER type, a good candidate for acceleration. Finally, I worked also on a new kind of source: the charged black holes, which can be at the origin of UHECR emission. I sketch the acceleration mechanism and the expected flux, suggesting a correlation with gamma-ray bursts. So I propose a strategy of trajectory reconstruction, which can be improved with the next generation experiments (AUGER, SKA, LOFAR), as well as a new source to be searches through this new kind of astronomy
Jradi, Khalil. "Étude et réalisation de photodétecteurs de type APD Geiger pixellisés à très haute sensibilité pour l'astronomie gamma très haute énergie". Toulouse 3, 2010. http://thesesups.ups-tlse.fr/984/.
Texto completoVery High Energy gamma ray astronomy uses till now exclusively as detector the Photomultiplier Tube (PMT) to collect weak light flux of atmospheric showers. But an alternative is now emerging: Avalanche Photodiodes polarized in Geiger mode called "Geiger-APD". The PMT is a detector designed in the 70's which presents many advantages but also suffers from several drawbacks: size, weight, cost, sensitivity to magnetic field but especially difficulty to realize its pixilation in matrix. Geiger-APDs are semi-conductor devices made of PN junction integrated in a special technology to detect very low light flux, thanks to the polarization beyond the avalanche voltage. Geiger-APD presents very high photoelectron gain (˜106) strongly dependant on the polarization voltage beyond avalanche. These photodiodes present many advantages with respect to PMT, mainly as concerns miniaturization for applications based on imaging, such as the detection of Cerenkov flashes in gamma ray astronomy. In this thesis, we present the study, the design and the realization of a technological structure, based on Silicon. This structure has shown reliability to detect weak luminous flux with breakdown voltage at 12V and dark current below 10pA at breakdown. We also developed several models, physical and electrical, necessary to the technological optimization, as well to the development of control and readout circuits, i. E. The basis of any imaging technology. The work presented here consists in the study, the design and the realization of a matrix of high sensitivity pixels. A project of a Cerenkov telescope based on this innovative technology is also presented
Garcon, Thibault. "Vers la radiodétection autonome des rayons cosmiques de très haute énergie". Phd thesis, Université de Nantes, 2010. http://tel.archives-ouvertes.fr/tel-00562591.
Texto completoGarçon, Thibault. "Vers la radiodétection autonome des rayons cosmiques de très haute énergie". Nantes, 2010. http://archive.bu.univ-nantes.fr/pollux/show.action?id=02d861a2-b295-46ec-a427-99001f4cd97a.
Texto completoThe radiodetection of extensive air showers, investigated for the first time in the 1960’s, obtained promising results but plagued by the technical limitations. At that time, H. R. Allan summed up the state of the art in an extensive review article whose conclusions and predictions are still used today. Set up in 2001 at the Nancay Observatory, the CODALEMA experiment was built first as a demonstrator and succesfully showed the feasibility of the radiodetection of extensive air showers. Radically modified in 2005, it allowed to obtain a clear energy correlation, and put in evidence an unambiguous signature of the geomagnetic origin of the electric field emission process associated to the air shower. The switch towards large areas is the next step of the technique’s development. Therefore, the autonomy of the detectors becomes essential. After test prototypes installed in 2006 at the Pierre Auger Observatory, a generation of new autonomous detectors was developed. Their first results will be presented. This work is also dedicated to the issues related to the radiodetection technique : the antenna response, the sensitivity, the surrounding effects, the monitoring of a big array. The determination of the shower characteristics independently of other detectors such as the lateral distribution, the energy correlation and the frequency spectrum of the radio transient will be discussed
Donnard, Jérôme. "Etude et conception d'un imageur β à très haute résolution spatiale". Nantes, 2008. http://www.theses.fr/2008NANT2130.
Texto completoThe b autoradiography is a widely used technique in pharmacology or biological fields. It is able to locate in two dimensions molecules labeled with beta emitters. The development of a gaseous detector incorporating micromesh called PIM in the Subatech laboratory leads to the construction of a very high spatial resolution apparatus dedicated to b imaging. This device is devoted to small analysis surface of a half microscope slide in particular of 3H or 14C and the measured spatial resolution is 20 µm FWHM. The recent development of a new reconstruction method allows enlarging the field of investigation to high energy beta emitters such as 131I, 18F or 46Sc. A new device with a large active area of 18x18 cm2 has been built with a user friendly design. This allows to image simultaneously 10 microscope slides. Thanks to a multi-modality solution, it retains the good characteristics of spatial resolution obtained previously on a small surface. Moreover, different kinds of samples, like microscope slides or scotches can be analysed. The simulation and experimentation work achieved during this thesis led to an optimal disposition of the inner structure of the detector. These results and characterization show that the PIM structure has to be considered for a next generation of b-Imager
Donnard, J. "Étude et conception d'un imageur bêta à très haute résolution spatiale". Phd thesis, Université de Nantes, 2008. http://tel.archives-ouvertes.fr/tel-00769792.
Texto completoBarrau, Aurélien. "Astrophysique gamma de très haute énergie : étude du noyau actif de galaxie Mrk 501 et implications cosmologiques". Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10020.
Texto completode, Naurois Mathieu. "L'astronomie gamma de très haute énergie de H.E.S.S. à CTA. Ouverture d'une nouvelle fenêtre astronomique sur l'Univers non thermique". Habilitation à diriger des recherches, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00687872.
Texto completoCapítulos de libros sobre el tema "Electrons de très haute énergie"
SOL, Hélène. "Jets relativistes et mécanismes aux très hautes énergies". En Noyaux actifs de galaxie, 165–246. ISTE Group, 2023. http://dx.doi.org/10.51926/iste.9087.ch4.
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