1,723,207 research outputs found
E-ASTROGAM: A space mission for MeV-GeV gamma-ray astrophysics
Full text linke-ASTROGAM is an observatory space mission dedicated to the study of the gamma radiation in the range from 0.3 MeV to 3 GeV. The detector is composed by a Silicon tracker, a calorimeter, and an anticoincidence system. The mission is based on an advanced space-proven detector technology, with unprecedented sensitivity, angular and energy resolution, combined with polarimetric capability. Thanks to its performance in the MeV-GeV domain, substantially improving its predecessors, eASTROGAM will open a new window on the non-thermal Universe. In particular it will determine the origin of key isotopes fundamental for the understanding of supernova explosions and the chemical evolution of our Galaxy. It will also shed light on the processes behind the acceleration of cosmic rays in our Galaxy
I percorsi autorizzativi critici, nella progettazione
No full texta cura A. Ciribini, E. De Angelis, A. Ferr
OPTIMAL HEAT STORAGE CAPACITY AND EFFICIENCY OF HEATING PLANTS EQUIPPED WITH HAND CHARGING WOOD BOILERS
No full textThe structural identification of the infill walls contribution in the dynamic response of framed buildings
No full textReinforced concrete (RC) frame buildings containing unreinforced masonry infill walls are commonly used in structural systems around the world. The performance of this type of building can be significantly affected by the presence of infill walls according to their type and distribution in the plane and along the height as revealed by earthquakes. This paper presents data collection, system identification, and finite element modeling of an existing RC framed building designed for gravity loads and containing unreinforced masonry infill walls. Based on a previously carried out ambient vibration test, a three-dimensional finite element model, comprising infill walls and partitions, was successfully updated on the basis of the global modes identified by the in situ test, pointing out the important role of the nonstructural components for this type of building. The influence of the infill walls and partitions on the vibration period was examined, introducing a comparison with simple formulations for the period calculation suggested by codes or available in the literature. The updated model has been further used to assess an approach for an approximate estimation of the story and global stiffness of the building considering the effect of the secondary elements. The dynamic test with the model updating results an efficient procedure for a complete identification of the elastic behavior of the structure
Evaluation of the ground-coupled quasi-stationary heat transfer in buildings by means of an accurate and computationally efficient numerical approach and comparison with the ISO 13370 procedure
No full textAssessing water-wall behaviour for a light-water Small Modular Reactor with the aid of CFD analyses
Full text linkThe paper summarises the results of a work performed in the frame of the EU ELSMOR project in the aim to characterise the behaviour of a reference Small Modular Reactor equipped with a passive containment system cooled by a surrounding water-wall. The work started with a review of the available literature, aimed at identifying experimental data possibly in a suitable scaling range, useful to draw conclusions about the decay heat rejection capabilities of such systems at full scale. This search for suitable data encountered difficulties, since the downscaling in height of most of the existing experimental facilities does not allow for reaching the target Rayleigh numbers envisaged for free convection in full scale reactor conditions (Ra similar to 10(16)). In the lack of sufficient experimental information, it was firstly tried to reproduce downscaled experimental data by CFD; then, CFD was used to predict the water-wall behaviour in full scale configurations, on the basis of parametric assumptions about size and boundary conditions. The results help in sketching the phenomena that can be expected in reactor conditions at full scale, providing inter alia suggestions about pool mixing and the time needed to reach bulk boiling conditions. 2D, 3D and lumped parameter models were adopted using a range of assumptions to assess relevant phenomena. A study of the effect of geometrically downscaling facilities was also performed by CFD analyses. The obtained predictions of the system behaviour with different scales and assumptions address the present knowledge gap and are useful to highlight relevant phenomena on which experimental activities should be focused in the future
A satellite-based green index as a proxy for vegetation cover quality in a Mediterranean region
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