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Debayle Johan Ðogaš Vesna Gotovac Helisová Kateřina Staněk Jakub Zikmundová Markéta 《Methodology and Computing in Applied Probability》2021,23(2):471-490
Methodology and Computing in Applied Probability - The paper concerns a method for assessing similarity of realisations of random sets based on a construction of their morphological skeletons and a... 相似文献
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de Langlard Mathieu Lamadie Fabrice Charton Sophie Debayle Johan 《Methodology and Computing in Applied Probability》2021,23(2):549-567
Methodology and Computing in Applied Probability - The paper focuses on a new method for the inference of a parametric random spheroid from the observations of its 2D orthogonal projections. Such a... 相似文献
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Pérez F Debayle A Honrubia J Koenig M Batani D Baton SD Beg FN Benedetti C Brambrink E Chawla S Dorchies F Fourment C Galimberti M Gizzi LA Gremillet L Heathcote R Higginson DP Hulin S Jafer R Koester P Labate L Lancaster KL MacKinnon AJ MacPhee AG Nazarov W Nicolai P Pasley J Ramis R Richetta M Santos JJ Sgattoni A Spindloe C Vauzour B Vinci T Volpe L 《Physical review letters》2011,107(6):065004
Fast electrons produced by a 10 ps, 160 J laser pulse through laser-compressed plastic cylinders are studied experimentally and numerically in the context of fast ignition. K(α)-emission images reveal a collimated or scattered electron beam depending on the initial density and the compression timing. A numerical transport model shows that implosion-driven electrical resistivity gradients induce strong magnetic fields able to guide the electrons. The good agreement with measured beam sizes provides the first experimental evidence for fast-electron magnetic collimation in laser-compressed matter. 相似文献
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J. J. Santos A. Debayle Ph. Nicola? V. Tikhonchuk M. Manclossi D. Batani A. Guemnie-Tafo J. Faure V. Malka J. J. Honrubia 《The European physical journal. Special topics》2009,175(1):71-76
The high current electron beam losses have been studied experimentally with 0.7 J, 40 fs, 6 1019 Wcm-2 laser pulses interacting with Al foils of thicknesses 10-200 μm. The fast electron beam characteristics and the foil temperature
were measured by recording the intensity of the electromagnetic emission from the foils rear side at two different wavelengths
in the optical domain, ≈407 nm (the second harmonic of the laser light) and ≈500 nm. The experimentally observed fast electron
distribution contains two components: one relativistic tail made of very energetic (T
h
tail ≈ 10 MeV) and highly collimated (7° ± 3°) electrons, carrying a small amount of energy (less than 1% of the laser energy),
and another, the bulk of the accelerated electrons, containing lower-energy (T
h
bulk=500 ± 100 keV) more divergent electrons (35 ± 5°), which transports about 35% of the laser energy. The relativistic component
manifests itself by the coherent 2ω0 emission due to the modulation of the electron density in the interaction zone. The bulk component induces a strong target
heating producing measurable yields of thermal emission from the foils rear side. Our data and modeling demonstrate two mechanisms
of fast electron energy deposition: resistive heating due to the neutralizing return current and collisions of fast electrons
with plasma electrons. The resistive mechanism is more important at shallow target depths, representing an heating rate of
100 eV per Joule of laser energy at 15 μm. Beyond that depth, because of the beam divergence, the incident current goes under
1012 Acm-2 and the collisional heating becomes more important than the resistive heating. The heating rate is of only 1.5 eV per Joule
at 50 μm depth. 相似文献
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Multi-residue analysis of traces of pesticides and antibiotics in honey by HPLC-MS-MS 总被引:2,自引:0,他引:2
Debayle D Dessalces G Grenier-Loustalot MF 《Analytical and bioanalytical chemistry》2008,391(3):1011-1020
The aim of this work was to develop an analytical method for simultaneous assay of residues of two families of antibiotics,
and three pesticides, in honey. The assays involved a mixture of five tetracyclines, four sulfamides, and the pesticides coumaphos,
carbendazim, and amitraz (two metabolites). All the compounds were extracted from honey and pre-concentrated by optimised
solid-phase extraction (SPE). Analysis was by high-performance liquid chromatography-mass spectrometry-mass spectrometry (HPLC-MS-MS)
using a triple-quadrupole spectrometer in multiple reaction monitoring (MRM) mode in order to identify and quantify the compounds
present (Sheth et al J Agric Food Chem 38:1125–1130, 1990). During development of the analytical method a strong matrix effect
was found that depended on the floral origin of the honey. This led to the development of a standard additions method to quantify
the contaminants sought. 相似文献
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Manclossi M Santos JJ Batani D Faure J Debayle A Tikhonchuk VT Malka V 《Physical review letters》2006,96(12):125002
The transport of an intense electron beam produced by ultrahigh intensity laser pulses through metals and insulators has been studied by high resolution imaging of the optical emission from the targets. In metals, the emission is mainly due to coherent transition radiation, while in plastic, it is due to the Cerenkov effect and it is orders of magnitude larger. It is also observed that in the case of insulators the fast-electron beam undergoes strong filamentation and the number of filaments increases with the target thickness. This filamented behavior in insulators is due to the instability of the ionization front related to the electric field ionization process. The filamentary structures characteristic growth rate and characteristic transversal scale are in agreement with analytical predictions. 相似文献
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