196,406 research outputs found
Distribution code set up in the liberalised environment Regulatory perspective – The Italian experience
No full textAccelerated Koenigs-Knorr glucuronidation of a deactivated nitrophenol: Unveiling the role of polyamine additive 1,1,4,7,10,10-hexamethyltriethylenetetramine through design of experiments
No full text1,1,4,7,10,10-Hexamethyltriethylenetetramine (HMTTA) emerged from a limited parallel screening of selected polyamines as the most appropriate additive for an especially problematic Koenigs-Knorr glucuronidation. This initial finding rapidly evolved into a reliable and high-yielding procedure through the use of two sets of experimental designs. The detailed effect of the stoichiometry of reagents and the amount of amine additive on reaction yield was elucidated. The complexity of the response surface for product yield, described by a third-order polynomial equation, together with ancillary kinetic experiments evidenced the multiple role of HMTTA in the present glucuronidation process
Statistical Experimental Design-Driven Discovery of Room Temperature Conditions for Palladium - Catalyzed Cyanation of Aryl Bromides
No full textAnalytical approach to geomorphological analysis, estimation of debris potential and hydraulic infrastructures in the Torrente Gravio basin (Susa Valley)
No full textThe study concerns the analysis of a mountain basin (Torrente Gravio, Susa Valley, Turin) from a geomorphological point of view, aimed to estimate the debris potential in order to assess suitability and current conditions of existing hydraulic infrastructures and to propose needed action. The methodological approach followed represents an example of an analysis that takes into consideration several elements: the climatic analysis, the historical research, the geomorphological analysis, the estimation of debris potential through an analytical procedure and, lastly, a critical analysis of existing and/or suggested hydraulic infrastructures based on other achieved results
Intrinsic environmental vulnerability as shallow landslide susceptibility in environmental impact assessment
No full textThis work investigated the susceptibility factors that trigger shallow landslides. In particular, the objective of the research was the implementation of a method to determine the relevant factors that can trigger shallow landslide events. However, with respect to the existing methods, the integration with historical datasets and the inclusion of spatial factors displaying dynamics in the same characteristic timescales were specific features of the developed tool. The study area included the watersheds of the Sessera and Strona rivers in the alpine area of the Province of Biella (Piedmont, NW Italy). The method was developed and tested from two sub-datasets derived from an integrated dataset that referred to an intense event, involving the same area, that occurred in 1968 (2-3 November). This allowed the implementation of an integrated representation of landslides' predisposing factors and the identification and classification in different groups of the areas susceptible to geo-hydrological instability processes. The previously existing databases were verified and integrated into a geographic information system (GIS) environment, giving a potentially sharable source of information for planning purposes. The obtained maps represent a metric of one of the possible intrinsic environmental vulnerability factors for the area under study. Consequently, this method can represent a future instrument for determining the intrinsic environmental vulnerability dependent on landslides within an environmental impact assessment (EIA), as required by the most recent European regulation on EIA. Moreover, the shared information can be used to implement informed policy and planning processes, based on a bottom-up approach. In particular, the availability online of landslide susceptibility maps could support the generation of augmented information-useful for both local administrators and planners as well as for stakeholders willing to implement specific projects or infrastructure in vulnerable areas, such as mountains
M. Romei, M.G. D’Angelo, A. Lo Mauro, S. Bonato, S.Gandossini, A.C. Turconi, G.P. Comi, E. Marchi, A. Pedotti, N.Bresolin, A. Aliverti
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Excitable solitons in a semiconductor laser with a saturable absorber
No full textSelf-pulsing cavity solitons may exist in a semiconductor laser with an intracavity saturable absorber. They show locally the passive Q-switching behavior that is typical of lasers with saturable absorbers in the plane-wave approximation. Here we show that excitable cavity solitons are also possible in a suitable parameter range and characterize their excitable dynamics and properties
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