6,827 research outputs found
Betti maestro di casistica
No full textIl saggio riguarda taluni aspetti dei metodi di ricerca e di insegnamento di Emilio Betti e si concentra in particolare sull’attenzione da lui prestata si casi pratici (partendo dal volume Esercitazioni romanistiche sui casi pratici pubblicato nel 1930). L’autore esamina i rapporti tra l’analisi casistica e la riflessione dogmatica – secondo il peculiare significato che Betti attribuisce al termine “dogmatica” che non è in opposizione necessaria (ma piuttosto in connessione) col la conoscenza storica – e il contesto culturale e accademico nel quale Betti operò e le principali dottrine giuridiche e filosofiche cui si ispirava
L’attualità delle ricerche di Mario Betti (1875-1942)
No full textMario Betti was a distinguished Italian chemist of the early 20th century. He investigated many research fields, but he is particularly known for innovative syn- thetic reactions and for his research in asymmetric synthesis. However, his work was al- most forgotten until the end of the 20th century, when the group of Naso and Cardellic- chio in Bari brought to the attention of the organic chemistry community a new re- search, inspired from the work of Betti. Since then, many research groups around the world have applied this old chemistry, that is still interesting and abreast of contempo- rary synthetic problems
The ?2-cohomology of hyperplane complements
No full textWe compute the l^2-Betti numbers of the complement of any finite collection of affine hyperplanes in complex n-space. At most one of the l^2-Betti numbers is non-zero. <br/
Advances on income inequality and concentration measures
No full textThis impressive collection from some of today's leading distributional analysts provides an overview a wide range of economic, statistical and sociological relationships that have been opened up for scientific study by the work of two turn-of-the-20th-century economists: C. Gini and M. O. Lorenz. The authors include such figues as Barry Arnold and Frank Cowell and the resulting book deserves its place on the bookshelf of serious mathematical economists everywhere. © 2008 Editorial matter and selection, Gianni Betti and Achille Lemmi; individual chapters, the contributors. All rights reserved
Introducción
No full textSi tratta dell'introduzione a un volume che raccoglie saggi dedicati allo spagnolo negli Stati Uniti, con particolare riferimento alla sua presenza nelle istituzioni, nella società e nei mezzi di comunicazione
On the evolution of Betti curves in the cosmic web
No full textIn this work, we study the evolution of Betti curves obtained by persistent-homological analysis of point clouds formed by halos in different cosmological N-body simulations. We show that they can be approximated with a scaled log-normal distribution function with reasonable precision. Our analysis shows that the shapes and maximums of Betti curves exhibit dependence on the mass range of the selected subpopulation of halos. Still, at the same time, the resolution of a simulation does not play any significant role, provided that the mass distribution of simulated halos is complete down to a given mass scale. Besides, we study how Betti curves change with the evolution of the Universe, i.e., their dependence on redshift. Sampling subpopulations of halos within certain mass ranges up to redshift z=2.5 yields a surprisingly small difference between corresponding Betti curves. We propose that this may be an indicator of the existence of a new specific topological invariant in the structure of the Universe
Sustainable Development Goals indicators: a methodological proposal for a fuzzy Super Index in the Mediterranean area
No full textThis paper provides a methodological proposal for the construction of a multidimensional index for sustainability assessment in the context of the Sustainable Development Goals (SDGs) of the 2030 Agenda for Sustainable Development. In particular, the paper proposes a new methodology to properly estimate the multidimensional nature of sustainable development and the SDGs introducing an innovative fuzzy approach. Specifically, we present a multidimensional methodology to build a Super Index to measure the performance of the Mediterranean countries towards the SDGs with a focus on the agro-food sustainability in line with the Partnership for Research and Innovation in the Mediterranean Area (PRIMA). For this purpose, drawing on the fuzzy approach developed by Betti et al. (2015), a step by step procedure is provided in the paper: first the underlying dimensions of a set of selected indicators for the SDGs are identified through an exploratory factor analysis and then an innovative weighting methodology is applied for the aggregation of the indicators to calculate the countries’ scores for each dimension and finally the overall index
Formazione professionale, mercato del lavoro e crisi economica nella Regione Veneto. Una prospettiva di genere
No full text210Po in the Gessoso Solfifera Formation of Perticara Mine
No full textThe Perticara sulphur mine is a historically important mine located in the province of Rimini (Italy), known for the large crystals of sulfur that were extracted there, and for the abundance of ore. The mine was developed in the Gessoso-Solfifera Formation, a rock succession mainly formed by gypsum and limestone that is well preserved in the western Romagna Apennines area (Roveri et al., 2003). The Gessoso-Solfifera Formation comprises primary and clastic, resedimented evaporites with interbedded organic-rich shales, which were deposited during the evaporitic and post-evaporitic stages of the Messinian salinity crisis (Roveri et al., 2003). The Perticara mine was active for a few centuries until the mid-twentieth century. In 2016 the mine was re-explored by the Federazione Speleologica Regionale Emilia Romagna and starting from this data various environmental matrices (rocks, minerals, water, air) were sampled over time. Samples of natural epsomite crystals (general formula Mg(SO4)·7H2O), that extensively grow on rock walls and blocks with a fibrous habit, were collected and morphologically and chemically investigated using SEM-EDS, XRPD, ICP-AES and alpha spectrometry measurements.
Most of the fibres are of inhalable size and can be potentially adsorbed from all parts of the respiratory tract. Their solubility and the presence of significant amounts of toxic elements (As, Co, Fe, Mn, Ni, Sr, Ti, Zn) and radioactive isotope 210Po (and to a less extent 228Th) make the inhalation of these fibres potentially hazardous to human health. These preliminary results were recently published by Giordani et al. (2022). Moreover, a significant concentration of 222Rn (238U decay series), as well as CO2 and CO in the air of the mine, could play an important role in the accumulation of 210Po in epsomite, while very few amounts of 210Po were detected in the water springs and pools inside the mine or in host rocks, but further investigation is needed.
Giordani M., Meli M.A., Roselli C., Betti M., Peruzzi F., Taussi M., Valentini L., Fagiolino I. & Mattioli M. (2022) - Could soluble minerals be hazardous to human health? Evidence from fibrous epsomite. Environ. Res., 206, 112579.
Roveri M., Manzi V., Lucchi F.R. & Rogledi S. (2003) - Sedimentary and tectonic evolution of the Vena del Gesso basin (Northern Apennines, Italy): implications for the onset of the Messinian salinity crisis. Geol. Soc. Am. Bull., 115(4), 387-405
Non-orientable surface-plus-one-relation groups
No full textRecently Dicks–Linnell determined the L2-Betti numbers of the orientable surface-plus-one-relation groups, and their arguments involved some results that were obtained topologically by Hempel and Howie. Using algebraic arguments, we now extend all these results of Hempel and Howie to a larger class of two-relator groups, and we then apply the extended results to determine the L2-Betti numbers of the non-orientable surface-plus-one-relation group
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