197,262 research outputs found
Profilo dell'attività scientifica di Fabiola Ardizzone
No full textSi ripercorre l'attività scientifica della compianta Collega Fabiola Ardizzone, dai suoi esordi come allieva della Cattedra di Archeologia Cristiana dell'Università di Palermo, all'attività di insegnamento e di ricerca sul campo in qualità di Professore Associato. Il contributo dato da Fabiola Ardizzone agli studi sulla Tarda Antichità e sul Medioevo siciliani hanno riguardato molteplici direttrici di ricerca: dall'identificazione di nuove classi ceramiche alle modalità di organizzazione delle aree funerarie, dai problemi di topografia urbana all'archeologia dei cimiteri e ai problemi della produzione e circolazione delle produzioni ceramiche.The paper traces the scientific activity of Fabiola Ardizzone, from her beginnings as a student of the Chair of Christian Archeology at the University of Palermo, to the teaching and field research as Associate Professor. The contribution given by Fabiola Ardizzone to the studies on the Late Antiquity and Medieval Sicily concerns multiple research lines: identification of new ceramic productions, problems of urban topography, funerary archeology, production and circulation of fine and coarse wares in Medieval Mediterranean
Bulk, surface and double layer properties of zirconia polymorphs subjected to mechanical treatments
No full textZirconia (ZrO2) may exist in different polymorphs. At low pressures and for temperatures as high as ∼-1150 °C only the stable phase has the monoclinic structure; tetragonal and cubic oxides form however, as metastable phases together with the monoclinic in the lower temperature region (up to ca. 600 - 800 °C). By combining stages of calcination (of a hydrothermal precursor) with severe grinding treatments of the powders it was possible to obtain pure phase monoclinic oxides (S. Ardizzone, G. Bassi, G. Liborio, Colloids and Surfaces 51 (1990) 207). This paper reports results concerning the effects specifically induced by the severe grinding on the phase composition, on the state of the surface and on the interfacial electrostatic reactivity of the powders. The effects produced by ageing, calcinations and further mechanical treatments of the samples are also examined by the same techniques i.e. by X-ray diffraction, XPS determinations and surface charge measurements. © 1991
The role of the synthetic procedure of nano-crystalline TiO2 on the photodegradation of toluene
No full textBecause of its stability and nontoxicity TiO2 has been extensively investigated as an efficient photocatalyst for purifying water and air. The use of TiO2 in photocatalytic concrete and paints is very promising and intensively investigated.
In recent years a great deal of activity was dedicated, by the authors’ group, to the study of synthetic routes leading to nanocrystalline materials with tailored features, mainly in the case of titania. Sol-gel paths, combined with hydrothermal stages performed either in the presence or in the absence of surfactants, have led to nanocrystalline TiO2 with controlled enrichment in either anatase, brookite or rutile [1-4]. There is ample debate in the literature concerning the actual role played by either of the titania polymorphs with respect to the photocatalytic activity of the material [5].
In this work the authors report on the activity of nanocrystalline titania, prepared by a multi-step sol-gel procedure, with respect to the photodegradation of toluene used as a model compound. Samples with varying surface area and anatase/brookite/rutile content are fully characterized and then tested and their photoactivity is compared with that of the most commonly commercial TiO2 photocatalysts.
The photodegradation of toluene is investigated both in aqueous and in gas phase. In the former case the composition of the reacting mixture, in terms of side products, is followed by HPLC and MS-GC and the total mineralization by TOC. In the latter case the reactor is equipped with an online micro-GC.
[1] T. Boiadjieva, G. Cappelletti, S. Ardizzone, S. Rondinini, A. Vertova, Phys. Chem. Chem. Phys., 5 (2003) 1689.
[2] G. Cappelletti, C. Ricci, S. Ardizzone, C. Parola, A. Anedda, J. Phys. Chem. B., 109 (2005) 4448.
[3] C.L. Bianchi, S. Ardizzone, G. Cappelletti, Dekker Encyclopedia of Nanoscience and Nanotechnology Marcel Dekker (New York), 2006, pp. 1-10, DOI: 10.1081/E-ENN-120042107
[4] G.Cappelletti, C.L.Bianchi, S. Ardizzone, Appl. Surf. Sci., 253 (2006) 519-524
[5] J. Krysa, M. Keppert, J. Jirkovsky, V. Stengl, J. Subrt, Mater. Chem. Phys., 86 (2004) 333
Commento di dottrina e giurisprudenza agli artt. 695-704 c.p. in tema di armi e munizioni
No full textSi tratta del commento di dottrina e giurisprudenza agli artt. 695-704 in tema di armi e munizion
Pattern of distribution and diversity of demersal assemblages in the central Mediterranean sea
No full textA highly diversified mix of fish species, cephalopods and crustaceans, together with several macro-epibenthic organisms, compose trawl catches in the Mediterranean Sea. Management of Mediterranean trawling needs a multispecies approach that considers the community and not the single species as the basic unit of the analysis. While many studies have correlated several environmental factors to the spatial organizations of demersal organisms, few have focused on the role of macro-epibenthic communities in structuring demersal assemblages. In this paper, the following hypotheses were tested: (1) there are discrete demersal assemblages in the central Mediterranean Sea; (2) the distribution and diversity of demersal communities does not change on small temporal scales (I year); (3) the demersal assemblages were segregated across both different epibenthic assemblages and depth gradients. Shallow stations were separated into coastal and middle-deep shelf assemblages while stations on the slope formed three main assemblages: slope edge, upper slope and middle slope assemblages. The demersal community did not show a substantial change at the small temporal scale. Sandy, sand-muddy and detritic epibenthic communities characterized coastal shelf assemblages, while epibenthic assemblage on muddy bottoms were dominant in the deeper areas of the shelf. A well-defined difference in macro-epibenthic faunal associations among stations on the slope (depth > 200 m) was not found. Depth appeared to affect diversity of the main taxa of demersal organisms in different ways. Teleostean diversity did not show any trend with depth, the number of cephalopod species increased on the shelf and decreased on the slope while crustacean and elasmobranch species richness increased significantly from the shelf to the middle slope. The strong correlation shown in this study between epifaunal benthic communities and demersal fish assemblages requires the formulation of an ecosystem-based management for the Mediterranean Sea trawl fisheries. The existence of such biological diversity certainly contributes to the Mediterranean ecosystem health and its conservation should become one of the main objective of demersal resources management in the future
ACQUAROLI R. (2009). Commento agli artt. 157-161 c.p. In: M. RONCO, S, ARDIZZONE, B. ROMANO. Codice penale commentato II edizione.
No full textBiologic targeting in the treatment of inflammatory bowel diseases [Retraction]
No full textBosani M, Ardizzone S, Porro GB. Biologics: Targets and Therapy. 2009;3:77–97.This paper has been retracted after we were made aware that it contains a large amount of reused, and uncited material that was not placed within quotation marks.The following statement has been supplied by Dr Sandro Ardizzone:The review entitled "Biologic targeting in the treatment of inflammatory bowel disease" has been commissioned by this journal and published in 2009 (Matteo Bosani, Sandro Ardizzone, Gabriele Bianchi Porro. Biologics: Targets & Therapy 2009;3:77–97). The paper was written by our young coworker (Dr M Bosani). He has consulted many papers, including our previous reviews published years before. The not perfect knowledge of English language has greatly influenced the writing of the paper itself. So he saved in word file several parts of our previous papers (Ardizzone S, Bianchi Porro G. Inflammatory bowel disease: new insights into pathogenesis and treatment. J Intern Med 2002;252:475–496 – Ardizzone S, Bianchi Porro G. Biologic therapy for inflammatory bowel disease. Drugs 2005:2253–2286), and then transferred to the final paper. He was unaware as we are, of the fact that he could not reuse previously published material in other journals. The reuse of this material was made in good faith.Taking our responsibility for what happened, we intend to apologize for this inconvenience to the Editor (Dr Doris Benbrook) and Publisher (Dr Tim Hill). Moreover, for the reasons mentioned above, I consider appropriate to retract the paper itself.This retraction relates to this paper
- …
