197,843 research outputs found
Azobenzene containing polymers: what is yet viable with aged liquid crystals
No full textA Commentary on the paper ”Photochromic liquid crystalline polymers. Main chain and side chain polymers containing azobenzene mesogens„, by A. S. Angeloni, D. Caretti, C. Carlini, E. Chiellini, G. Galli, A. Altomare, R. Solaro and M. Laus. First published in Liquid Crystals, 4, 513‐527 (1989)
ASO Author Reflections: Amid Anatomic Restrictions, Three-Dimensional Surgical Planning Eases En Bloc Resection of the Retro-Hepatic Vena Cava and the Caudate Lobe of the Liver
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Physiological parameters predicting the outcome of surgical and nonsurgical treatment of fecal incontinence
No full textFecal incontinence is a multifactorial disease. Anorectal physiology studies play an outstanding role in the evaluation of its etiology and severity, the two main factors that constitute the basis for the correct choice of treatment. However, the prognostic role of clinical factors and anorectal physiological tests in predicting the outcome to either conservative or surgical treatment is questionable. © 2007 Springer-Verlag Italia
On a class of elliptic-parabolic equations on unbounded intervals
No full textWe study a class of degenerate elliptic second order differential operators acting on some
polynomial weighted function spaces on [0, +∞[. We show that these operators are the generators
of C_0-semigroups of positive operators which, in turn, are the transition semigroups associated with
right-continuous normal Markov processes with state space [0, +∞]. Approximation and qualitative
properties of both the semigroups and the Markov processes are investigated as well. Most of the
results of the paper depend on a representation of the semigroups we give in terms of powers of
particular positive operators of discrete type we introduced and studied in a previous paper
Effects of metal nanoparticles deposition on the photocatalytic oxidation of ammonia in TiO2 aqueous suspensions
No full textTiO2 powders modified through the deposition of surfactant-stabilized preformed metal (Pt, Pd, Au and Ag) nanoparticles (NPs) were tested as photocatalysts for batch ammonia photo-oxidation in aqueous suspension, under UVA irradiation. NH3 conversion and the selectivity toward mildly oxidized N2 and highly oxidized nitrite and nitrate anions were monitored during the runs, in order to study the effects of noble metal NPs deposition on the reaction mechanism. This involves parallel and consecutive paths, also depending on the type of metal deposited on TiO2, as also highlighted by the nitrite photo-oxidation tests performed in the present study. Metal NPs acted as electron traps ensuring better separation of the photoproduced charge couples and consequently higher rates of hole-mediated oxidation reactions. Apart from Au/TiO2, the metal-modified powders exhibited higher photoactivity with respect to that of naked titania, with Ag/TiO2 being the best performing photocatalyst in terms of ammonia conversion. On the other hand, Pd NPs on TiO2 ensured a considerable increase of the selectivity toward N2 and may thus be considered the best co-catalysts of TiO2 for environmentally friendly photocatalytic NH3 abatement
Malocclusione II Classe 1 divisione con biprotrusione: estrazione quattro primi premolari tecnica Edgewise
No full textFrancesco Altomare - the remarkable mathematician and human being
No full textWe laconically describe the great contributions of Professor Francesco Altomare to mathematical research and PhD education, and his unique status in the mathematical community. In particular, we present and give examples of his innovative and great achievements related to the following areas of mathematics: Functional Analysis, Operator Theory, Potential Theory, Approximation Theory, Probability Theory, Function Spaces, Choquet's Theory, Dirichlet's Problem and Semigroup Theory. Moreover, we report on and give concrete examples of his unique way to work together with PhD students, both before and sometimes also after their dissertation. Finally, we shortly describe his remarkable “class travel” from “simple” conditions with no academic traditions in his family in the small hometown Giovinazzo to finally become the broad, ingenious, and powerful mathematician he is regarded to be today
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