Infortuni, il mosaico difficile della protezione

VENGONO PRESENTATE E COMMENTATE ALCUNE INTERESANTI STATISTICHE SUGLI INFORTUNI SUL LAVOR

Il totem dei costi che separa il dire e il fare

VENGONO MESSE IN LUCE ALCUNI CORRENTI FALSIFICAZIONI DEI DATI RELATIVI AGLI INFORTUN

150 anni di energia italiana

Sono riscostruiti i consumi italiani dall'unità del paese ad oggi. La modellistica basata sulla dinamica logistica delle frazioni e penetrazioni di mercato è usata per mettere in luce le proprietà del sistema energetic

Equivalence of new-direct and new-indirect Monte Carlo methods

It is well known that the reliability analysis of complex systems, such as nuclear power plants, may require Monte Carlo simulation, [1] a method which allows detailed modeling and more realistic component and system representation. Quite often, Monte Carlo must be associated with variance reduction techniques, due to the rareness of the failure events. In these cases, in order to define and compute correctly the weights, a clear definition of the system failure probability is required. Starting from a rigorous definition, a new form of the direct Monte Carlo has been derived, [2] and the procedure is briefly presented. Then, using the insights of this formulation, a new form of the indirect Monte Carlo method is presented, and the equivalence between the two approaches is demonstrated. The comparison with the traditional direct and indirect approaches is presented. It shows that the new ones consider a history as a set of sequences, while the previous as a single sequence: consequently, the results are the same but the efficiency is enhanced with the new approaches

A Test Reference Year (TRY) approach to gas dispersion in the atmosphere

selection of meteorological hourly data from a long time series (20 years or so) for simulation of gas dispersion. This selection (called TRY/TMY) turns out to be much more precise than the currently used approaches