1,722,243 research outputs found
Prefazione
No full textprefazione al volume "La riforma dello sport: contributi di diritto ed economia dello sport" a cura di G. Martinelli e M. Rogolin
ARMA spectrum estimation by extended latticeICASSP '84. IEEE International Conference on Acoustics, Speech, and Signal Processing
No full textLinear prediction estimation of sinusoids in additive noise with very short data sequences
No full textGeochimica isotopica. In: Risorse idriche sotterranee della Provincia di Ferrara
No full textLa caratterizzazione isotopica delle risorse idriche sotterranee, che si sviluppano nel territorio ferrarese, con particolare interesse al primo (A1-I) e secondo acquifero in pressione (A2-I), è stata realizzata, tramite l’elaborazione, di dati provenienti da una rete di monitoraggio costituita da 18 pozzi In particolare, sono stati utilizzati dieci campioni d’acqua per la caratterizzazione isotopica del sistema acquifero A1-I ed otto per quello A2-I. Nei campioni raccolti sono stati analizzati i rapporti isotopici 18O/16O, D/H ed il contenuto il tritio (T), carbonio-14 (14C) e carbonio-13 (13C)
Geochemical and isotopic composition of the groundwater resources of the Po River delta (Northern Italy): implications for the environmental impact
No full textThe chemical and hydrodynamic characteristics of groundwater in deltaic regions are strongly influenced by the complex stratigraphic sequence of these areas, caused by the continuously varying depositional environments associated with their recent hydrographic evolution. As a case study, the eastern sector of the Po River plain, northern Italy, has been investigated to understand the quality of the available groundwater resources. Based on the analysis of hydrochemical and isotopic data, the recharge characteristics, the groundwater residence time and the aquifer vulnerability are defined. The results show significant qualitative degradation of the unconfined aquifer due to the shallow depth to water, while in the underlying confined aquifer, a hydrochemical facies of Ca-HCO3 type prevails. The spatial variation and relationship between oxygen-18 and deuterium determine: firstly, hydraulic separation of the two hydrogeological units; secondly, direct infiltration of local precipitation to the unconfined aquifer; thirdly, the occurrence of waters originating in the Alps and locally from the Apennines, pervading the confined aquifer. The tritium results suggest local mixing between the superficial waters and the confined aquifer, occurring along the palaeo-river channels. This increases the pollution vulnerability of the confined hydrogeological unit within the plain, which is the only natural groundwater resource exploited for water supply
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