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Precautionary retirement and precautionary saving
Full text linkThe paper analyzes the lifetime utility maximization problem of an agent who chooses her saving and timing of retirement in the presence of labor income risk in a simple setting where a pure redistributive pension scheme is in place. In this context, a precautionary motive for retirement, which pushes old workers to replace an uncertain labor income with certain pension payments, and to retire early is identified. The conditions for precautionary retirement and saving to arise are then characterized and interpreted in two settings. In the first setting, utility only depends on income, and a sufficiently low level of absolute prudence is necessary for precautionary retirement. A sufficiently high level is necessary however for precautionary saving, which can coexist with precautionary retirement only for intermediate values of absolute prudence. In the second setting, agent utility also depends on leisure, and three conditions allow the precautionary motive for retirement and saving to jointly operate: prudence, an index of absolute prudence sufficiently low and cross-prudence in leisure
Storia dell'arte in Sardegna.Pittura e scultura del primo Novecento
No full textIl volume ricostruisce la nascita, ai primi del Novecento, di un movimento figurativo in Sardegna, regione in precedenza priva di scuole o di tendenze artistiche proprie. Sulla spinta di forti motivazioni identitarie e in rapporto con scrittori quali Grazia Deledda e Sebastiano Satta, gli artisti sardi si impegnarono a creare una nuova immagine della Sardegna, rappresentando scene di vita contadina nei modi della Secessione viennese prima, e di un sobrio realismo poi.The books traces back the origins of the early Twentieth century's Sardinian artistic movement (Sardinia had previously been without art schools or artistic tendencies). Moved by strong identity reasons, Sardinian artists strove to create a new figurative image for their homeland, looking at the Vienna Secession and later adopting a sober realistic style
Helium bubble evolution in F82H-mod - Correlation between SANS and TEM
No full textThe growth of He-bubbles after low temperature He-implantation and subsequent high temperature tempering in F82H-mod steel has been studied by using transmission electron microscopy (TEM) and small-angle neutron scattering (SANS). The results obtained by both techniques show that after implantation the bubbles are homogeneously distributed around an average size of 11 Å, while after subsequent tempering He-bubbles one order of magnitude larger grow in size and volume fraction. Additionally, the SANS data show a consistent population of bubbles smaller than 10 Å, which is discussed with reference to the possible migration and coalescence mechanisms during high temperature tempering
Small angle neutron scattering investigation of microporosity in marbles
No full textSmall angle neutron scattering (SANS) measurements have been carried out on different marble and limestone samples, of relevance to cultural heritage safeguard, to investigate the micropore size distribution. Different varieties of marble have been studied using a CaCO3 single crystal as a pore-free reference. A series of red scaglia limestone samples has also been studied, obtaining in this case identical SANS cross sections for specimens issued from a modern quarry and for samples issued from an historical building. The micropore volume distribution functions, obtained from the SANS data, are compared with porosimetry results
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