[en] The aim of this study was to determine the thermomechanical story which occur in a metallic uranium sample, whose characterization was unknown. For this purpose a metallographic study was done as well as chemical analysis, hardness measurements, density, gamma spectrometry and S.E.M. The results of the study showed that the sample was (most) probably hot extruded in the a phase followed by a high temperature annealing in the a phase obtaining a fine microstructure of equiaxed grains (20-35 μm). Also some melting defects were found, showing that this material cannot be used as a nuclear fuel. (Author)

[en] Aim of the study: We analysed the effects of thinning intensity and canopy type on Scots pine growth and stand dynamics in a mixed Scots pine-beech forest. Area of the study: Western Pyrenees. Material and methods: Three thinning intensities were applied in 1999 (0, 20 and 30% basal area removed) and 2009 (0, 20 and 40%) on 9 plots. Within each plot, pure pine and mixed pine-beech patches are distinguished. All pine trees were inventoried in 1999, 2009 and 2014. The effects of treatments on the tree and stand structure variables (density, basal area, stand and tree volume), on the periodic annual increment in basal area and stand and tree volume, and on mortality rates, were analysed using linear mixed effects models. Main Results: The enhancement of tree growth was mainly noticeable after the second thinning. Growth rates following thinning were similar or higher in the moderate than in the severe thinning. Periodic stand volume annual increments were higher in the thinned than in the unthinned plots, but no differences were observed between the thinned treatments. We observed an increase in the differences of the Tree volume annual increment between canopy types (mixed < pure) over time in the unthinned plots, as beech crowns developed. Research highlights: Moderate thinning is suggested as an appropriate forest practice at early pine age in these mixed forests, since it produced higher tree growth rates than the severe thinning and it counteracted the negative effect of beech on pine growth observed in the unthinned plots. (Author)

No abstract available

[en] It is described the research done at C.CH.E.N. on the preparation of U₃O₈ powder with appropriate characteristics to be used as fisil dispersion for M.T.R. type fuel. Optimum conditions were found and good powder with high density, low surface area and approppiate morfology was prepared. (Author)

[en] This article presents the case of a 62-year-old man with treated Hodgkin's disease who had internal mammary lymph nodes relapse after a complete initial response. These masses were gallium avid. These findings were explained by histologically documented Hodgkin's relapse, the first such case reported in that localization without chest wall involvement. The literature on mediastinal Hodgkin's disease and diagnostic procedures are reviewed. (orig.)