40 research outputs found
Direct and indirect assessment of the amount of naturally occurring asbestos in fractured rocks
Critical evaluation of preoperative instrumental staging of rectal tumors. Research on the adequate use of US, CT and MR].
[Magnetic resonance in the study of patients of short stature of the hypothalamo-hypophyseal origin. Report on 29 cases]. FT La risonanza magnetica nello studio dei pazienti con bassa statura di origine ipotalamo-ipofisaria. Rapporto su 29 casi.
MAGNETIC-RESONANCE AND THE DIAGNOSIS OF SHORT STATURE OF HYPOTHALAMIC HYPOPHYSEAL ORIGIN.
Is the persistence of isolated GH deficiency in adulthood predicted by anatomical hypothalamic-pituitary alterations?
Peroxidic perfluoropolyether for the covalent binding of perfluoropolyetherchains on carbon black surface
Abstract
Peroxidic perfluoropolyethers (PFPEs) are suitable tools for the covalent linkage of fluorinated groups on substrates containing aromatic moieties. Thus the thermal decomposition process of such fluorinated peroxides allowed the covalent linkage of PFPE radicals to the polycyclic aromatic structure of a graphitic carbon black. Contact angle measurements on molded pellets made with modified carbon black powders revealed a gradual enhancement of the hydrophobicity, which follows the increase of the fluorine content on the surface according to XPS experiments. BET analyses also revealed variations of the surface area of carbonaceous samples. Products and by-products were also evaluated by mass balances of decomposed portions of PFPE residues, respectively, PFPE chains bonded on carbon black and PFPE fluids obtained by homocoupling side-reactions. Modified carbonaceous materials were analyzed by solid state 19F-MAS NMR and the results are in agreement with the proposed radical mechanism
Urinary 6-sulfatoxymelatonin circadian rhythm and domestic exposure to 50 Hertz electromagnetic fields
Petrofacies for the prediction of NOA content in rocks. Application to the "Gronda di Genova" tunneling project
Realization of large geo-engineering projects in rocks containing naturally occurring asbestos (NOA) must address several
crucial geo-environmental issues, including the design of the construction site, the enforcement of health protection measures
and the environmentally responsible spoil management. This leads to a compelling need to develop effective and standard
procedures to evaluate the distribution and concentration of NOA in rock volumes. NOA petrofacies are here proposed as an
innovative tool to evaluate the asbestos distribution and concentration in complex geological settings. NOA petrofacies are
fundamental asbestos-bearing rock types, consisting in recurrent lithological and structural features controlling asbestos occurrence.
Here we describe and discuss how the NOA petrofacies approach was utilized in a geo-environmental study for the
evaluation of asbestos content in a complex meta-ophiolite suite, which will be crossed by the "Gronda di Genova" highway bypass
project (Genoa, NW Italy). NOA petrofacies were used to predict the distribution and relative abundance of NOA in
geologically homogeneous zones characterized by the occurrence of specific NOA minerals