1,721,222 research outputs found
PH in reverse micelles: The acid dissociation constant of the 7-hydroxy coumarin in Water/AOT/Isooctane water-in-oil microemulsions
No full textThe apparent pKa of the 7-hydroxycoumarin (Umbelliferone) was spectrophotometrically measured in a Water/AOT/Isooctane microemulsion in the presence of Tris, Ammonia, and Carbonate buffer solutions. The apparent pKa increases of about 2 units, in comparison with the pKa measured in bulk water, for the smallest values of the molar ratio Water/AOT, and decreases with the radius of the nanodroplets. The results are discussed taking into account the profile of the electrical potential drop into the water pool and the possible partition of the Umbelliferone between the aqueous core and the surfactant
Critical Analysis of the Results of a Network System for Nitrogen Dioxide Monitoring
Full text linkData relative to the nitrogen dioxide concentrations of seventeen fixed monitoring stations in three provinces in Po Valley in Northern Italy are analysed. NO2 is considered to be one of the most harmful air pollutants, mainly due to vehicle traffic in urban environments. According to the EU directives, different categories of monitoring sites are identified as being representative of different situations. The main objective of this study was to check the agreement of the classification of monitoring sites with the chemical measurements of the actual atmospheric NO2 pollution. The analysis considered the whole year of 2022 and even included the consideration of single months; the aim was to identify seasonal effects. The data were treated using different chemometric techniques, and the results obtained from significance tests were consistent with those of cluster analyses. In particular, both approaches to the treatment of the chemical data indicate that the level of NO2 pollution may be significantly different from one station to another, even within the same category, and may produce results that are more similar to those of different categories, both inside the same province and in different provinces. Beyond local interest, this work also acts as a case study, attempting to offer a path for a common approach to effective reproducible monitoring procedures toward shared environmental sustainability
Utilità della n - metil - benzochinolina - metil - solfato associata alla tonzilamina cloridrato nella prevenzione delle irritazioni oculari da sorgenti artificiali di radiazioni ultraviolette.
No full textLipschitz continuity results for a class of obstacle problems
No full textWe prove Lipschitz continuity results for solutions to a class of obstacle problems under standard growth conditions of p-type, p b 2. The main novelty is the use of a linearization technique going back to [28] in order to interpret our constrained minimizer as a solution to a nonlinear elliptic equation, with a bounded right hand side. This lead us to start a Moser iteration scheme which provides the Ll bound for the gradient. The application of a recent higher di¤erentiability result [24] allows us to simplify the procedure of the identification of the Radon measure in the linearization technique employed in [32]. To our knowdledge, this is the first result for nonautomonous functionals with standard growth conditions in the direction of the Lipschitz regularity
La dissimulazione in medicina legale oculistica : utilità del MAV nello screening preventivo.
No full textKINETICS OF AMINO-ACIDS PARTITION BETWEEN A BULK WATER SOLUTION AND A WATER-IN-OIL MICROEMULSION
No full textValidità terapeutica del glucuronil - glucosamin - glicano - solfato nelle alterazioni vascolari retiniche espressione di vasculopatia arteriosclerotica : note preliminari.
No full textValidità terapeutica del cianinoside cloruro nel miglioramento dell’adattamento alle condizioni scotopiche in giovani miopi sia in presenza che in assenza di ipertensione endoculare.
No full textPOTENTIAL PROFILE IN THE CORE OF REVERSE MICELLES AND ITS INFLUENCE ON CHEMICAL-EQUILIBRIA
No full textValidità della n-metil-benzochinolina-metil-solfato associata alla tonzilamina cloridrato nella prevenzione dei disturbi oculari da metodologie fluorangiografiche o laserterapia.
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