103,451 research outputs found
Luigi De Marchi
No full textMilone Ferdinando. Luigi De Marchi. In: Annales de Géographie, t. 46, n°260, 1937. pp. 204-205
How can GIS support the evaluation and design of biodiverse agroecosystems and landscapes? Applying the Main Agroecological Structure to European agroecosystems
No full textSearch for the X(17) particle in the 7Li(p, e+e−)8Be reaction with the MEG II detector
No full textA recent measurement of the Internal Pair Creation in the 7Li(p,e+e-)8Be reaction performed at the Atomki laboratory in Hungary showed an unexpected excess in their angular distribution. The significance of the observed bump is ~7 standard deviations, and following measurements of the same reaction but with an upgraded experimental apparatus showed analogous results. Moreover, a measurement of the 3H(p,e+e-)4He reaction showed another significant excess at a different angle. Both these observations can be explained by the creation of a new physics boson with a 17 MeV mass called X(17). The MEG II experiment was designed to search for Charged Lepton Flavor Violation in the mu o e gamma decay, but its detectors are able to measure the 7Li(p,e+e-)8Be reaction as well. The experiment is in fact equipped with a photon detector and a magnetic spectrometer, and has access to a Cockroft-Walton accelerator for the photon detector calibrations. The accelerator can be used to generate the necessary proton beam, and the magnetic spectrometer can be used to measure the decay products of the reaction. An independent measurement with an experiment that guarantees a better invariant mass resolution and a larger angular acceptance can confirm that the anomaly observed at Atomki is not an artifact of the detector geometry, but a real anomaly not explained by any known nuclear physics effect. This measurement is possible only through a redesign of the target region of the CW accelerator used for MEG II calibrations, which was carefully selected after thermomechanical and physics simulations. The signal and background simulations, modeled on the state of the art knowledge of the IPC theory, showed that the MEG II experiment can perform the 7Li(p,e+e-)8Be measurement with a resolution on the invariant mass of 504 keV and reach a sensitivity of 5 in few days of data acquisition. A first prototype of this experimental setup, different from the final design, was built in such a way to not interfere with the MEG II data taking. It was used to take some preliminary data during the 2021 MEG II engineering run to test the CDCH reconstruction algorithms and to find the optimal trigger strategy for the final measurement. The construction of the definitive target region is underway and will be ready for the beginning of 2022, when the X(17) measurement at MEG II will begin
Scenari di evoluzione dell'industria tessile abbigliamento ed effetti delle politiche distributive
No full textIl paper studia l'impatto delle operazioni di acquisizione e accordo sulle strategie distributive delle imprese italiane del tessile abbigliamento
Un'aggiunta per il Trecento a Bolzano: le pitture di San Lorenzo a Rencio
No full textIl saggio presenta le pitture trecentesche della chiesa di San Lorenzo a Rencio presso Bolzano, riscoperte negli anni '90 del secolo scorso. Si tratta della decorazione absidale della chiesa antica che venne eseguita plausibilmente negli anni '60 del XIV secolo. Si tratta di una necessaria integrazione all'Atlante della pittura a Bolzano edito nel 2001, a cura di A. De Marchi, T. Franco e S. Spada Pintarelli
Low-impact thermal insulation materials for sustainable retrofitting: Potentialities and barriers from a literature review
No full textThe present study provides both an updated overview of the most recent studies about low environmental impact materials for building retrofitting and meta-analyses of the most important features, such as the thermal conductivity, allowing to evaluate their insulation potential against the diffused and recurrent conventional competitors. Specifically, 466 case studies about materials derived by co-production, wastes of other products and recycled ones have been selected and their thermal performances have been analysed. The materials have been clustered into homogeneous classes: lose materials and foams; structural materials; panels; finishing materials. The results show that some low environmental impact materials are characterized by thermal performances which can position them as materials able to contribute to building decarbonization, but little information can be found about other characteristics which can be crucial when the built environment is considered, such as durability, fire resistance, costs, and load resistance. Yet, these latter aspects may be investigated further when the material is considered to enter the prototyping phase whether in the academic or market context. The present study provides a base for discussion about the use of more environmentally friendly thermal insulation materials which in the coming years might represent a valid option for sustainable building renovation
Letter, [Author unclear] to Paulina T. Merritt
No full textHandwritten letter to Paulina Merritt from an unknown author, October 1, 1876.
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