1,720,994 research outputs found
Studio teorico sperimentale sulla ventilazione nella miniera di talco di Fontane
No full textBollettino Ass. Min. Subalpin
Analisi delle condizioni di microclima e di inquinamento particolato in una miniera di talco
No full textBoll. Ass. Min. Subalpin
Safety topics and accident rate in Italian mining operations: an up to date approach to the problem
No full textAuxiliary ventilation plant and air dispersed particulates: an experimental study in the stopes of an italian talc mine
No full textBollettino Associazione Mineraria Subalpin
Transferability and seasonality in extreme value theory applications to road safety: A case study in an Italian motorway
No full textThe application of extreme value theory (EVT) to road safety can produce quick and reliable safety evaluations. In view of a future widespread practical application, this paper investigates for the first time the issues of model transferability and seasonality in EVT. A case study dealing with motorway rear-end collision risk is presented. Vehicle-by-vehicle traffic data were collected in 14 motorway sections with similar characteristics for a year, and Time-To-Collision (TTC) was computed for each couple of consecutive vehicles. Two sets of Generalized Pareto distributions were fitted with the Peak-Over-Threshold approach: in Set#l TTC values were aggregated across all sections, for each month; in Set#2 for each section and each month, only TTC collected in all the other sections in the same month were considered. Model performance was evaluated comparing predicted and observed rear-end collisions. According to the findings of this work, it is possible to aggregate data from several road sections, provided that they share similar geometric, traffic and weather characteristics, to estimate EVT models; moreover, such models are transferable with very good results to other similar road sections. In addition to this, results show that it is important to take into account seasonality effect, as predictions made considering data collected for only a short continuous observation period may be largely overestimated or underestimated
Safety drafts and regulations for mining activities: present situation and future developments
No full textSafety analysis of unsignalized intersections: a bivariate extreme value approach
No full textApplication of extreme value theory (EVT) to road safety analysis is gaining interest, thanks to its ability to produce quick and reliable safety evaluations without the use of crash data. Traditionally applied to single collision types and single extreme variables (i.e. surrogate measures of safety), EVT can be further exploited to simultaneously model multiple collision types, with the use of multiple extreme variables. In this paper two bivariate EVT approaches are applied for the safety evaluation of a three-leg unsignalized intersection, considering: (i) two conflict points and a single surrogate measure of safety; (ii) two surrogate measures of safety collected in a single conflict point. Each bivariate analysis was applied with two EVT methods: Component-wise Maxima (CM) and Excesses Over a Threshold (EOT). Bivariate models produced good results, especially with the EOT method, and were able to significantly improve the univariate benchmark results when the two estimation datasets were correlated
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