1,363,314 research outputs found
Cambia il Nord, cambia il welfare
No full textIn un paese che registra grandi differenze tra le sue varie aree in merito alle dinamiche del sistema produttivo e alla distribuzione della spesa pubblica, la crisi economica ha generato problemi diversi, che richiedono risposte e modelli di intervento adeguati. Al Nord il problema principale è dato, più che dal calo dell’occupazione, dalla perdita di qualità del lavoro, che accresce il numero dei soggetti esposti al rischio di disagio economico e sociale. Ed è proprio in quelle Regioni che la sperimentazione di nuove forme di intervento basate sul contributo di attori e risorse non pubbliche ha permesso di affiancare ai provvedimenti di policy più tradizionali un secondo welfare, più flessibile e adattabile a profili specifici
Place Recognition of 3D Landmarks based on Geometric Relations
No full textPlace recognition based on landmarks or features is an important problem occurring in localization, mapping, computer vision and point cloud processing. In this paper, we present GLAROT-3D, a translation and rotation invariant 3D signature based on geometric relations. The proposed method encodes into a histogram the pairwise relative positions of keypoint features extracted from 3D sensor data. Since it relies only on geometric properties and not on specific feature descriptors, it does not require any prior training or vocabulary construction and enables lightweight comparisons between landmark maps. The similarity of two point maps is computed as the distance between the corresponding rotated histograms to achieve rotation invariance. Histogram rotation is enabled by efficient orientation histogram based on sphere cubical projection. The performance of GLAROT has been assessed through experiments with standard benchmark datasets
Collaborative Housing: A Potential Answer to (Housing) Exclusion?
No full textIn the past decade, the collaboration paradigm has made significant inroads into dwelling models, promoting the spread of collaborative housing (CH). This umbrella term encompasses a broad range of forms that vary both geographically and temporally. Recently, CH has been increasingly viewed as a solution for improving housing affordability and fostering the social inclusion of vulnerable individuals, whose fragility extends beyond income to encompass other personal conditions such as age, occupation, or disability. This trend is particularly pronounced in Italy, where research has begun to discuss collaborative social housing and «co-social housing», blurring the boundary between social housing and CH. Given these developments, it is essential to examine CH in Italy within the context of housing policies and the welfare state. What are the characteristics and outcomes of collaborative social housing? What role can it play in housing and welfare policies? This study undertakes an analysis of the principal literature on the topic and compares 28 collaborative social housing cases in Lombardy and Emilia Romagna. The results indicate that two patterns can be identified in collaborative social housing: one focused on housing affordability and the other on non-economic needs. While these patterns share similarities, they exhibit differences in characteristics (such as target, location, and selection criteria) and outcomes (such as impacts on social ties, intensity of sharing, and affordability). Moreover, the results suggest that CH can effectively contribute to achieving socially oriented goals. However, there are implications for social protection, including the risk of paradoxical marginalization of the most deprived individuals from housing and welfare benefits, as well as the exacerbation of territorial differences
Gli empori della solidarietà nel contrasto alla povertà alimentare
No full textIl nono capitolo del Secondo Rapporto sul secondo welfare affronta il tema della povertà alimentare e delle misure per contrastarla. Secondo le stime più recenti, sono 5 milioni e mezzo gli italiani in condizioni di povertà alimentare, di cui un milione e 300 mila sono minori. Nonostante queste cifre, in Italia continua a mancare una politica pubblica nazionale di contrasto alla povertà alimentare. Negli anni tale mancanza è stata affrontata, da un parte, attraverso le più generali misure di contrasto alla povertà (Social card, Nuova Carta Acquisti, ecc.), dall’altra delegata, più o meno esplicitamente, al volontariato e alla beneficienza, con evidenti limiti nel momento in cui l’indigenza ha iniziato ad assumere le cifre attuali. In questo quadro emerge tuttavia anche un dato positivo: la vivacità della società civile grazie alla quale stanno prendendo vita numerose iniziative di contrasto alla povertà alimentare, come gli empori della solidarietà. Pur essendo esperienze molto recenti, sui quali di conseguenza risulta difficile fare valutazioni, gli empori solidali risultano molto interessanti al fine di esplorare un nuovo ruolo per il volontariato nelle politiche sociali e suggerire modalità innovative di risposta alla povertà alimentare e non solo. L’approccio integrato di presa in carico della persona si rivela infatti più efficace nel favorire la riattivazione degli individui e nell’aggredire in particolare le nuove povertà nelle sue diverse “gradazioni”
Enhancement of annihilation cross sections by electric interactions between the antineutron and the field of a large nucleus
No full textData relative to antineutron and antiproton annihilation on large nuclei in the range 75-200MeV/c present two unexpected features: a) antineutron and antiproton cross sections have a similar size, b) the rise of the antineutron cross section at decreasing energy is much steeper than predictable for an inelastic process of purely strong nature at that energy. The observed behavior of (Formula presented.)-nucleus annihilations is similar to what would be expected for (Formula presented.)-nucleus annihilations, where the Coulomb attraction focusses (Formula presented.) trajectories towards the nucleus, enhancing the inelastic cross section by a factor 1/p2with respect to (Formula presented.) on the same target. This results in a 1/p2behavior at small energies. The presence of a similar enhancement in the antineutron case may only be justified by an interaction with a longer range than strong interactions. Excluding a Coulomb force because of the (Formula presented.) neutrality, and taking into account that an intrinsic electric dipole is forbidden for the antineutron, the next choice is an electric dipole that is induced by the nuclear electric field. Recent theoretical works have shown that a nonnegligible electric polarization may be induced in a neutron by QED vacuum polarization. Assuming this as a possibility, we have used a simple model to calculate the polarization strengths that are needed to fit the available data in terms of this effect. These are within the magnitude predicted by the vacuum polarization model. We have also discussed alternative scenarios that could induce an electric polarization of the antineutron as a consequence of the interplay between strong and e.m. interactions
A scan matching method based on the area overlap of star-shaped polygons
No full textWe illustrate a method that performs scan matching by maximizing the intersection area of the scans. The intersection area is a robust parameter that is less prone to measurement errors with respect to alternative techniques.
Furthermore, such technique does not require to associate each point of one scan to a point of the other one like in some popular algorithms. The relative pose that maximizes the overlap is estimated iteratively. Since the scans are represented by star-shaped polygons due to visibility properties, their intersection can be computed using an efficient linear-time traversal of the
vertices. Then, the relative pose is updated under the hypothesis that the combinatorics of intersection is left unchanged and the procedure is repeated until the scans are aligned with sufficient precision
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