Volatility in European regions

This paper examines the growth rate volatility of European regions’ per capita GDP from 1992 to 2008. We measure the regional volatility using a new methodology based on Markov matrices, and investigate its main determinants. Volatility displays a geographical pattern and a significant spatial dependence. Output composition appears one of the main drivers of volatility; among the other determinants we find a negative impact of the size of regional economies and of labour market flexibility, and a positive impact of sectoral concentration, financialization of the economy, and, occasionally, of participation in EMU.     

Paracetamol oxidation from aqueous solutions by means of ozonation and H2O2/UV system

Paracetamol oxidation from aqueous solutions is studied by means of ozonation and H(2)O(2) photolysis. Both oxidative systems are able to destroy the aromatic ring of the substrate with a partial conversion of the initial carbon content into carbon dioxide. For the adopted experimental conditions mineralization degrees up to 30% and 40% are observed with ozonation and H(2)O(2) photolysis, respectively. Main reaction intermediates and products are identified for both systems by HPLC and GC-MS analyses and a kinetic characterization is achieved.     

Inhibition vs. enhancement of the nitrate-induced phototransformation of organic substrates by the OH scavengers bicarbonate and carbonate

Contrary to common expectations, the hydroxyl scavengers, carbonate and bicarbonate, are able to enhance the phototransformation by nitrate of a number of substituted phenols. Carbonate and bicarbonate, in addition to modifying the solution pH, are also able to induce a considerable formation of the carbonate radicals upon nitrate photolysis. The higher availability of less-reactive species than the hydroxyl radical would contribute to substantially enhance the photodegradation of the phenols/phenolates that are sufficiently reactive toward the carbonate radical. This phenomenon has a potentially important impact on the fate of the relevant compounds in surface waters. In contrast, the degradation of compounds that are not sufficiently reactive toward CO₃^−• is inhibited by carbonate and bicarbonate because of the scavenging of ^•OH.