1,721,007 research outputs found
Strategic and operative needs for managing existing buildings: social housing as a case study
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Spectral induced polarization for monitoring electrokinetic remediation processes
No full textElectrokinetic remediation is an emerging technology for extracting heavy metals from contaminated soils and sediments. This method uses a direct or alternating electric field to induce the transport of contaminants toward the electrodes. The electric field also produces pH variations, sorption/desorption and precipitation/dissolution of species in the porous medium during remediation. Since heavy metal mobility is pH-dependent, the accurate control of pH inside the material is required in order to enhance the removal efficiency. The common approach for monitoring the remediation process both in laboratory and in the field is the chemical analysis of samples collected from discrete locations. The purpose of this study is the evaluation of Spectral Induced Polarization as an alternative method for monitoring geochemical changes in the contaminated mass during remediation. The advantage of this technique applied to field-scale is to offer higher resolution mapping of the remediation site and lower cost compared to the conventional sampling procedure. We carried out laboratory-scale electrokinetic remediation experiments on fine-grained marine sediments contaminated by heavy metal and we made Spectral Induced Polarization measurements before and after each treatment. Measurements were done in the frequency range 10− 3–103 Hz. By the deconvolution of the spectra using the Debye Decomposition method we obtained the mean relaxation time and total chargeability. The main finding of this work is that a linear relationship exists between the local total chargeability and pH, with good agreement. The observed behaviour of chargeability is interpreted as a direct consequence of the alteration of the zeta potential of the sediment particles due to pH changes. Such relationship has a significant value for the interpretation of induced polarization data, allowing the use of this technique for monitoring electrokinetic remediation at field-scale
Modellazioni numeriche di risposte geofisiche in aree regionali a rischio nel dominio termomeccanico
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I valori dei pellegrini del Giubileo del 2000, tra il bene e il male
No full textLa presente analisi sui valori è in relazione ad altre categorie fondamentali per la costruzione della teoria sul pellegrinaggio, emerse nella seconda fase della ricerca sul Giubileo del 2000, quella sviluppata nell’ultimo triennio, 2004-2007. In questa nuova fase si è rilevato che i valori sono concetti chiave insieme con fede, religiosità, giubileo, famiglia, male, nella nuova teoria - in base ai dati - sul pellegrinaggio e sulla religiosità post-moderna.
L’obiettivo di questa seconda fase della ricerca è impostare i risultati dell’analisi dei dati in modo da costruire una più generale >, alla quale giungere tramite un percorso che considera il vissuto dell’esperienza giubilare come caso > della complessiva esperienza religiosa poiché capace di coinvolgere motivazioni, attese, emozioni e valori
La resistività come indizio di microfratturazioni in situazioni di stress: un modello numerico basato sugli elementi finiti
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