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187 results on '"Boselli, M. A."'

159. Roles of Extended and Localized States in the Magnetic and Transport Properties of GaMnAs Alloys.

Author

Cunha Lima, I., Oliveira, E., Dias Cabral, E., and Boselli, M.

Subjects
TITANIUM alloys, HETEROSTRUCTURES, FERMI level, FERROMAGNETIC materials, SPIN-polarized currents, ZEEMAN effect
Abstract

We investigate the spin-polarized transport of holes in GaMnAs/GaAs heterostructures with Mn concentration 5% in which a ferromagnetic order is known to exist. Disorder enters the problem both in the random distribution of Mn centers and impurities, and also in the orientation of the magnetic moments at the Mn sites. We take into account the existence of an impurity band determining the extended or localized nature of the states at and near the Fermi level. Magnetic order and resistivity are inter-related due to the influence of the spin polarization of the impurity band and the effect of the Zeeman splitting on the mobility edge. We obtain two channels of transport, one provided by the extended states above the mobility edge, when this lies below the Fermi level, the other coming out of the thermal excitation of the localized states through a hopping mechanism. We discuss the competition between these two channels in determining, once having obtained the dependence of the resistance on temperature, the metallic or non-metallic nature of the sample. [ABSTRACT FROM AUTHOR]

Published
2013
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161. Electrical control of magnetic quantum wells: Monte Carlo simulations.

Author

Cabral, E. Dias, Boselli, M. A., Oszwaldowski, R., Žutic, I., and da Cunha Lima, I. C.

Subjects
*ELECTRIC fields, *CURIE temperature, *MONTE Carlo method, *FERROMAGNETISM, *SEMICONDUCTORS, *SPINTRONICS
Abstract

We use Monte Carlo simulations to analyze electric-field control of Curie temperature TC for carrier-mediated ferromagnetism in semiconductors. Gating employed to achieve electrostatic doping in an optimized geometry of (Ga, Mn)As, a prototypical ferromagnetic semiconductor, reveals a highly tunable ferromagnetic order. We show the feasibility of ΔTC>100 K, an order of magnitude greater then the state-of-the-art measurements, at fields substantially smaller then the breakdown values. Such controllable ferromagnetism may help elucidate the mechanism of carrier-mediated magnetism in various semiconductors and offer versatile spintronic applications. [ABSTRACT FROM AUTHOR]

Published
2011
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167. Effect of age on EEG arousals in normal sleep.

Author

Boselli, M, Parrino, L, Smerieri, A, and Terzano, M G

Abstract

EEG arousals were quantified in 40 nocturnal polysomnographic recordings belonging to four age groups (teenagers: 10 to 19 years; young adults: 20 to 39 years; middle-aged: 40 to 59 years; elderly: > or = 60 years). Ten subjects (five males and five females) participated in each group. The subjects were healthy and sound sleepers. All sleep recordings were preceded by an adaptation night which aimed at excluding the presence of sleep-related disorders. The recordings were carried out in a partially soundproof recording chamber and in a standard laboratory setting. Arousal indices (AI), defined as the number of arousals per hour of sleep, were calculated for total sleep time (AI/TST) and for all the sleep stages. AI/TST increased linearly with age (r = 0.852; p < 0.00001): teenagers (13.8), young adults (14.7), middle-aged (17.8), elderly (27.1). An age-related positive linear correlation was found also for the arousal indices referred to NREM sleep (r = 0.811; p < 0.00001) and to stages 1 and 2 (r = 0.712; p < 0.00001), while in stages 3 and 4 and in REM sleep, arousal indices showed stable values across the ages. Overall, arousals lasted 14.9 +/- 2.3 seconds, with arousal duration stable across the ages (range of means: 13.3-16.6 seconds) and no relevant differences between NREM sleep (14.6 +/- 2.5 seconds) and REM sleep (16.2 +/- 5 seconds). The paper discusses the impact of age on arousals, the similarities between arousals and the phases d'activation transitoire, and the consideration that arousals are physiological components of sleep.

Published
1998

169. Erratum: The European Vitis Database (www.eu-vitis.de) - A technical innovation through an online uploading and interactive modification system (Vitis - Journal of Grapevine Research (2012) 51: 2 (79-85))

Author

Maul, E., Sudharma, K. N., Kecke, S., Marx, G., Moller, C., Audeguin, L., Boselli, M., Boursiquot, J. M., Bucchetti, B., Cabello, F., Carraro, R., Crespan, M., Andrés, M. T., Eiras Dias, J., Ekhvaia, J., Gaforio, L., Massimo Gardiman, Grando, S., Gyropoulos, D., Jandurova, O., Kiss, E., Kontic, J., Kozma, P., Lacombe, T., Laucou, V., Legrand, D., Maghradze, D., Marinoni, D., Maletic, E., Moreira, F., Muñoz-Organero, G., Nakhutsrishvili, G., Pejic, I., Peterlunger, E., Pitsoli, D., Pospisilova, D., Preiner, D., Raimondi, S., Regner, F., Savin, G., Sawides, S., Schneider, A., Sereno, C., Simon, S., Staraz, M., Zulini, L., Bacilieri, R., and This, P.

170. Grapevine European catalogue: Towards a comprehensive list

Author

Lacombe, T., Audeguin, L., Boselli, M., Bucchetti, B., Cabello, F., Chatelet, P., Crespan, M., D Onofrio, C., Dias, J. E., Ercisli, S., Massimo Gardiman, Grando, M. S., Imazio, S., Jandurova, O., Jung, A., Kiss, E., Kozma, P., Maul, E., Maghradze, D., Martinez, M. C., Muñoz, G., Pátková, J. K., Pejic, I., Peterlunger, E., Pitsoli, D., Preiner, D., Raimondi, S., Regner, F., Savin, G., Savvides, S., Schneider, A., Spring, J. L., Szoke, A., Veres, A., Boursiquot, J. M., Bacilieri, R., This, P., ProdInra, Archive Ouverte, Amélioration génétique et adaptation des plantes méditerranéennes et tropicales (UMR AGAP), Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Institut Français de la Vigne et du Vin (IFV), Department of Biotechnology, University of Verona (UNIVR), Department of Agricultural and Environmental Sciences, Università degli Studi di Udine - University of Udine [Italie], Instituto Madrileno de Investigacion y Desarrollo Rural, Agrario y Alimentario, Instituto Madrileño de Investigación y Desarrollo Rural, Agrario y Alimentario (IMIDRA), Agricultural Research Council (ARC), Department of Fruit Science and Plant Protection, Section of Fruit Science, University of Pisa - Università di Pisa, Instituto Nacional de Investigação Agrária (EVN), Faculty Department of Horticulture, Ataturk University Agricultural, Consiglio per la Ricerca e la Sperimentazione in Agricoltura, Centro di ricerca per la Viticoltura (CRAVIT), Edmund Mach Foundation (FEM), Department of Crop Science, Università degli Studi di Milano [Milano] (UNIMI), Research Institute of Crop Production, Büro für Rebsortenkunde und Klonzüchtung, Institute of Genetics and Biotechnology, Szent István University, Szöleszeti es Boraszati Kutatointezete, Research Institute for Viticulture and Enology (FVM), Institut für Rebenzüchtung Geilweilerhof (JKI-IRZ), Julius Kühn-Institut - Federal Research Centre for Cultivated Plants (JKI), Research Institute of Horticulture, Viticulture and Oenology, Mision Biologica de Galicia, Spanish National Research Council (CSIC), Plant Production Research Center (PPRC), Department of Viticulture and Enology [Zagreb], Faculty of Agriculture [Zagreb] (UNIZG), University of Zagreb-University of Zagreb, National Agricultural Research Foundation (NAGREF), Plant Virology Institute, Unit of Grugliasco, National Research Council (CNR), Federal College and Office of Vineyards and Orchards (HBLAuBA), National Institute for Viticulture and Oenology (INVV), Agricultural Research Institute, Centre de Recherche de Pully, Agroscope, Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro), Università degli Studi di Verona, Università degli studi di Milano [Milano], Julius Kühn Institute (JKI), Faculty of Agriculture, Department of Viticulture and Enology, University of Zagreb, and National Agricultural Research Foundation

Subjects
[SDV.SA]Life Sciences [q-bio]/Agricultural sciences, 0106 biological sciences, [SDV.SA] Life Sciences [q-bio]/Agricultural sciences, 010504 meteorology & atmospheric sciences, grapegen european project, grapevine, variety characterization, Risorse genetiche, Catalogo delle varietà di vite, Genetic resources, Grapevine varieties catalogue, viticulture, 01 natural sciences, vitis vinifera, vigne, 010606 plant biology & botany, 0105 earth and related environmental sciences
Abstract

VITIS - Journal of Grapevine Research, Vol. 50 No. 2 (2011): Vitis

173. The European vitis database (www.eu-vitis.de) - A technical innovation through an online uploading and interactive modification system E

Author

Maul, E., Sudharma, K. N., Kecke, S., Marx, G., Müller, C., Audeguin, L., Boselli, M., Boursiquot, J. M., Bucchetti, B., Cabello, F., Carraro, R., Crespan, M., Andrés, M. T., Eiras Dias, J., Ekhvaia, J., Gaforio, L., Massimo Gardiman, Grando, S., Gyropoulos, D., Jandurova, O., Kiss, E., Kontic, J., Kozma, P., Lacombe, T., Laucou, V., Legrand, D., Maghradze, D., Marinoni, D., Maletic, E., Moreira, F., Muñoz-Organero, G., Nakhutsrishvili, G., Pejic, I., Peterlunger, E., Pitsoli, D., Pospisilova, D., Preiner, D., Raimondi, S., Regner, F., Savin, G., Savvides, S., Schneider, A., Sereno, C., Simon, S., Staraz, M., Zulini, L., Bacilieri, R., and This, P.

176. Dynamic analysis of droplet transfer in gas–metal arc welding: modelling and experiments.

Author

Gherardi, M., Sanibondi, P., Boselli, M., Colombo, V., and Ghedini, E.

Subjects
ELECTRON-hole droplets, GAS metal arc welding, STEEL wire, SHIELDING gases, CHARGE exchange, COMPUTATIONAL fluid dynamics, DIFFUSION
Abstract

In this work, a pulsed welding process is investigated to highlight how a time-varying profile of current impacts the metal transfer dynamics. First, the process is recorded using a high-speed camera, allowing us to qualitatively evaluate the effectiveness of metal transfer and the synchronization of droplet detachment with current peaks. Second, a time-dependent axisymmetric 2D model is developed to take into account both the droplet detachment using a volume-of-fluid model and the production and diffusion of metal vapour through a simplified diffusion model (neglecting demixing effects). We report a comparison between experimental and simulative results of a pulsed transfer mode for a steel wire (φ = 1 mm) and Ar shielding gas. [ABSTRACT FROM AUTHOR]

Published
2012
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177. NMR study of electronic correlations in Mn-doped Ba(Fe1-xCox)2As2 and BaFe2(As1-xPx)2.

Author

LeBoeuf, D., Texier, Y., Boselli, M., Forget, A., Colson, D., and Bobroff, J.

Subjects
*ELECTRONIC systems, *MAGNETIC impurities, *NUCLEAR magnetic resonance, *MAGNETIC susceptibility, *SUPERCONDUCTORS
Abstract

We probe the real-space electronic response to a local magnetic impurity in isovalent and heterovalent doped BaFe2As2 (122) using nuclear magnetic resonance (NMR). The local moments carried by Mn impurities doped into Ba(Fe1-xCox)2As2 (Co-122) and BaFe2(As1-xPx)2 (P-122) at optimal doping induce a spin polarization in the vicinity of the impurity. The amplitude, shape, and extension of this polarization is given by the real part of the susceptibility x'(r) of FeAs layers and is consequently related to the nature and strength of the electronic correlations present in the system. We study this polarization using "As NMR in Co-122 and both 75As and 31P NMR in P-122. The NMR spectra of Mn-doped materials are made of two essential features. First, there is a satellite line associated with nuclei located as nearest neighbors of Mn impurities. The analysis of the temperature dependence of the shift of this satellite line shows that Mn local moments behave as isolated Curie moments. The second feature is a temperature dependent broadening of the central line. We show that the broadening of the central line follows the susceptibility of Mn local moments, as expected from typical Ruderman-Kittel-Kasuya-Yosida (RKKY)-like interactions. This demonstrates that the susceptibility x'(r) of FeAs layers does not make significant contribution to the temperature dependent broadening of the central line. X' (r) is consequently only weakly temperature dependent in optimally doped Co-122 and P-122. This behavior is in contrast with that of strongly correlated materials such as underdoped cuprate high-Tc superconductors where the central line broadens faster than the impurity susceptibility grows, because of the development of strong magnetic correlations when T is lowered. Moreover, the FeAs layer susceptibility is found quantitatively similar in both heterovalent doped and isolvalent doped BaFe2As2. [ABSTRACT FROM AUTHOR]

Published
2014
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178. Impact of CFTR Modulators on Beta-Cell Function in Children and Young Adults with Cystic Fibrosis

Author

Claudia Piona, Enza Mozzillo, Antonella Tosco, Sonia Volpi, Francesco Maria Rosanio, Chiara Cimbalo, Adriana Franzese, Valeria Raia, Chiara Zusi, Federica Emiliani, Maria Linda Boselli, Maddalena Trombetta, Riccardo Crocina Bonadonna, Marco Cipolli, Claudio Maffeis, Piona, C., Mozzillo, E., Tosco, A., Volpi, S., Rosanio, F. M., Cimbalo, C., Franzese, A., Raia, V., Zusi, C., Emiliani, F., Boselli, M. L., Trombetta, M., Bonadonna, R. C., Cipolli, M., and Maffeis, C.

Subjects
cystic fibrosis, elexacaftor-ivacaftor-tezacaftor, cftr modulator, β-cell function, cftr modulators, lumacaftor/ivacaftor, oral glucose tolerance test, glucose metabolism, insulin clearance, insulin sensitivity, General Medicine, cystic fibrosi
Abstract

Background: To date, no consistent data are available on the possible impact of CFTR modulators on glucose metabolism. The aim of this study was to test the hypothesis that treatment with CFTR modulators is associated with an improvement in the key direct determinants of glucose regulation in children and young adults affected by Cystic Fibrosis (CF). Methods: In this study, 21 CF patients aged 10–25 underwent oral glucose tolerance test (OGTT) before and after 12–18 months of treatment with Lumacaftor/Ivacaftor or Elexacaftor-Ivacaftor-Tezacaftor. β-cell function (i.e., first and second phase of insulin secretion measured as derivative and proportional control, respectively) and insulin clearance were estimated by OGTT mathematical modelling. Insulin sensitivity was estimated by the Oral Glucose Sensitivity Index (OGIS). The dynamic interplay between β-cell function, insulin clearance and insulin sensitivity was analysed by vector plots of glucose-stimulated insulin bioavailability vs. insulin sensitivity. Results: No changes in glucose tolerance occurred after either treatment, whereas a significant improvement in pulmonary function and chronic bacterial infection was observed. Beta cell function and insulin clearance did not change in both treatment groups. Insulin sensitivity worsened in the Lumacaftor/Ivacaftor group. The analysis of vector plots confirmed that glucose regulation was stable in both groups. Conclusions: Treatment of CF patients with CFTR modulators does not significantly ameliorate glucose homeostasis and/or any of its direct determinants.

Published
2022

179. Appendectomy during the COVID-19 pandemic in Italy: a multicenter ambispective cohort study by the Italian Society of Endoscopic Surgery and new technologies (the CRAC study)

Author

Sartori A., Podda M., Botteri E., Passera R., Agresta F., Arezzo A., Guerrieri M., Ortenzi M., Cavallo F., Zese M., Prando D., Restini E., Cianci P., Millo P., Brachet Contul R., Serrao A., Abatini F., Altomare D. F., Picciariello A., Chetta G., Lattanzio F., Tonini V., Gori A., Jovine E., Mastrangelo L., Sartarelli L., Frena A., Malpaga A., Bertelli F., Pignata G., Andreuccetti J., Sanna S., Lares B., Sechi R., Cillara N., Pisanu A., Delogu D., Ciaccio G., Farulla M., Casati M., Laface L., De Luca M., Russello D., Latteri S., Longoni M., Masci E., Vigna S., Campanile F. C., Foti N., Lepiane P., Balla A., Cantore F., Raveglia V., Borghi F., Giraudo G., Verzelli A., Budassi A., Patriti A., Foghetti D., Montin U., Amadio L., Anania G., Bombardini C., Fabbri N., Feo C., Cianchi F., Manetti A., Lucchese M., Soricelli E., Ceccarelli G., Patiti M., Frascio M., Stabilini C., Filauro M., Barberis A., Troian M., Nagliati C., Campagnacci R., Maurizi A., Berti S., Gennai A., Marvaso A., D'Antonio D., Feo C. V., Mazzola L., Selvaggi F., Carini S., Costanzo F., Boccia L., Pascariello A., Perrotta N., Celiento M., Opocher E., Giovenzana M., Stella M., Ferrara F., Boni L., Abate E., Da Lio C., Valli V., Gelmini R., Serra F., Piccoli M., Gozzo D., Gattolin A., Sasia D., Balani A., Petronio B., Calo P. G., Canu G. L., Contarini E., Piatto G., Vettoretto N., Caprioli M., Braga M., Chiappetta M. F., Maida P., Tammaro P., De Palma G., Milone M., Bottino V., Canfora A., Bagaglini G., Agrusa A., Barone M., Mirabella A., Marino M. V., Gulotta G., Romano G., Sorrentino M., Ferfoglia S., Papagni V., Eramo S., Boselli C., Basti M., Caracino V., Moretto G., Inama M., Capelli P., Conti L., Muratore A., Cuoghi M. M., Zerbinati A., Corso S., Vasino M. C., Montuori M., Fidanza F., Lucchetta A., Giuliani A., Dinatale G., Zanzi F., Guariniello A., Bonilauri S., Frazzetta G., Garino M., Marafante C., Gioffre A., Del Monte S. R., Sganga G., Fransvea P., Grande M., Siragusa L., Sica G., Paola M., Passantino D. G., Catani M., Ricci F., Lauro E., Facci E., Parini D., Armellino M. F., Argenio G., Porcu A., Perra T., Bordoni P., Fleres F., Parisi A., Rossi S., Saracco R., Bono D., Viora T., Orlando F., Ferrero A., Fontana A. P., De Paolis P., Visconti D., Quaglino F., Festa F., Palagi S., Lo Secco G., Morino M., Allaix M. E., Salzano A., Tirone G., Motter M., Zanus G., Passuello N., Massani M., Tutino R., Manzini N., Terranova S., Merenda R., Nordio S., Zonta S., Lovisetto F., Guglielmi A., Campagnaro T., Amedeo E., Scollica M., Amodio P., Giannotti D., Olmi S., Oldani A., Sartori, A., Podda, M., Botteri, E., Passera, R., Agresta, F., Arezzo, A., Guerrieri, M., Ortenzi, M., Cavallo, F., Zese, M., Prando, D., Restini, E., Cianci, P., Millo, P., Brachet Contul, R., Serrao, A., Abatini, F., Altomare, D. F., Picciariello, A., Chetta, G., Lattanzio, F., Tonini, V., Gori, A., Jovine, E., Mastrangelo, L., Sartarelli, L., Frena, A., Malpaga, A., Bertelli, F., Pignata, G., Andreuccetti, J., Sanna, S., Lares, B., Sechi, R., Cillara, N., Pisanu, A., Delogu, D., Ciaccio, G., Farulla, M., Casati, M., Laface, L., De Luca, M., Russello, D., Latteri, S., Longoni, M., Masci, E., Vigna, S., Campanile, F. C., Foti, N., Lepiane, P., Balla, A., Cantore, F., Raveglia, V., Borghi, F., Giraudo, G., Verzelli, A., Budassi, A., Patriti, A., Foghetti, D., Montin, U., Amadio, L., Anania, G., Bombardini, C., Fabbri, N., Feo, C., Cianchi, F., Manetti, A., Lucchese, M., Soricelli, E., Ceccarelli, G., Patiti, M., Frascio, M., Stabilini, C., Filauro, M., Barberis, A., Troian, M., Nagliati, C., Campagnacci, R., Maurizi, A., Berti, S., Gennai, A., Marvaso, A., D'Antonio, D., Feo, C. V., Mazzola, L., Selvaggi, F., Carini, S., Costanzo, F., Boccia, L., Pascariello, A., Perrotta, N., Celiento, M., Opocher, E., Giovenzana, M., Stella, M., Ferrara, F., Boni, L., Abate, E., Da Lio, C., Valli, V., Gelmini, R., Serra, F., Piccoli, M., Gozzo, D., Gattolin, A., Sasia, D., Balani, A., Petronio, B., Calo, P. G., Canu, G. L., Contarini, E., Piatto, G., Vettoretto, N., Caprioli, M., Braga, M., Chiappetta, M. F., Maida, P., Tammaro, P., De Palma, G., Milone, M., Bottino, V., Canfora, A., Bagaglini, G., Agrusa, A., Barone, M., Mirabella, A., Marino, M. V., Gulotta, G., Romano, G., Sorrentino, M., Ferfoglia, S., Papagni, V., Eramo, S., Boselli, C., Basti, M., Caracino, V., Moretto, G., Inama, M., Capelli, P., Conti, L., Muratore, A., Cuoghi, M. M., Zerbinati, A., Corso, S., Vasino, M. C., Montuori, M., Fidanza, F., Lucchetta, A., Giuliani, A., Dinatale, G., Zanzi, F., Guariniello, A., Bonilauri, S., Frazzetta, G., Garino, M., Marafante, C., Gioffre, A., Del Monte, S. R., Sganga, G., Fransvea, P., Grande, M., Siragusa, L., Sica, G., Paola, M., Passantino, D. G., Catani, M., Ricci, F., Lauro, E., Facci, E., Parini, D., Armellino, M. F., Argenio, G., Porcu, A., Perra, T., Bordoni, P., Fleres, F., Parisi, A., Rossi, S., Saracco, R., Bono, D., Viora, T., Orlando, F., Ferrero, A., Fontana, A. P., De Paolis, P., Visconti, D., Quaglino, F., Festa, F., Palagi, S., Lo Secco, G., Morino, M., Allaix, M. E., Salzano, A., Tirone, G., Motter, M., Zanus, G., Passuello, N., Massani, M., Tutino, R., Manzini, N., Terranova, S., Merenda, R., Nordio, S., Zonta, S., Lovisetto, F., Guglielmi, A., Campagnaro, T., Amedeo, E., Scollica, M., Amodio, P., Giannotti, D., Olmi, S., Oldani, A., Sartori A., Podda M., Botteri E., Passera R., Agresta F., Arezzo A., Guerrieri M., Ortenzi M., Cavallo F., Zese M., Prando D., Restini E., Cianci P., Millo P., Brachet Contul R., Serrao A., Abatini F., Altomare D.F., Picciariello A., Chetta G., Lattanzio F., Tonini V., Gori A., Jovine E., Mastrangelo L., Sartarelli L., Frena A., Malpaga A., Bertelli F., Pignata G., Andreuccetti J., Sanna S., Lares B., Sechi R., Cillara N., Pisanu A., Delogu D., Ciaccio G., Farulla M., Casati M., Laface L., De Luca M., Russello D., Latteri S., Longoni M., Masci E., Vigna S., Campanile F.C., Foti N., Lepiane P., Balla A., Cantore F., Raveglia V., Borghi F., Giraudo G., Verzelli A., Budassi A., Patriti A., Foghetti D., Montin U., Amadio L., Anania G., Bombardini C., Fabbri N., Feo C., Cianchi F., Manetti A., Lucchese M., Soricelli E., Ceccarelli G., Patiti M., Frascio M., Stabilini C., Filauro M., Barberis A., Troian M., Nagliati C., Campagnacci R., Maurizi A., Berti S., Gennai A., Marvaso A., D'Antonio D., Feo C.V., Mazzola L., Selvaggi F., Carini S., Costanzo F., Boccia L., Pascariello A., Perrotta N., Celiento M., Opocher E., Giovenzana M., Stella M., Ferrara F., Boni L., Abate E., Da Lio C., Valli V., Gelmini R., Serra F., Piccoli M., Gozzo D., Gattolin A., Sasia D., Balani A., Petronio B., Calo P.G., Canu G.L., Contarini E., Piatto G., Vettoretto N., Caprioli M., Braga M., Chiappetta M.F., Maida P., Tammaro P., De Palma G., Milone M., Bottino V., Canfora A., Bagaglini G., Agrusa A., Barone M., Mirabella A., Marino M.V., Gulotta G., Romano G., Sorrentino M., Ferfoglia S., Papagni V., Eramo S., Boselli C., Basti M., Caracino V., Moretto G., Inama M., Capelli P., Conti L., Muratore A., Cuoghi M.M., Zerbinati A., Corso S., Vasino M.C., Montuori M., Fidanza F., Lucchetta A., Giuliani A., Dinatale G., Zanzi F., Guariniello A., Bonilauri S., Frazzetta G., Garino M., Marafante C., Gioffre A., Del Monte S.R., Sganga G., Fransvea P., Grande M., Siragusa L., Sica G., Paola M., Passantino D.G., Catani M., Ricci F., Lauro E., Facci E., Parini D., Armellino M.F., Argenio G., Porcu A., Perra T., Bordoni P., Fleres F., Parisi A., Rossi S., Saracco R., Bono D., Viora T., Orlando F., Ferrero A., Fontana A.P., De Paolis P., Visconti D., Quaglino F., Festa F., Palagi S., Lo Secco G., Morino M., Allaix M.E., Salzano A., Tirone G., Motter M., Zanus G., Passuello N., Massani M., Tutino R., Manzini N., Terranova S., Merenda R., Nordio S., Zonta S., Lovisetto F., Guglielmi A., Campagnaro T., Amedeo E., Scollica M., Amodio P., Giannotti D., Olmi S., Oldani A., Sartori, Alberto, Podda, Mauro, Botteri, Emanuele, Passera, Roberto, Agresta, Ferdinando, Arezzo, Alberto, M Guerrieri, M Ortenzi, F Cavallo, M Zese, D Prando, E Restini, P Cianci, P Millo, R Brachet Contul, A Serrao, F Abatini, D F Altomare, A Picciariello, G Chetta, F Lattanzio, V Tonini, A Gori, E Jovine, L Mastrangelo, L Sartarelli, A Frena, A Malpaga, F Bertelli, G Pignata, J Andreuccetti, S Sanna, B Lares, R Sechi, N Cillara, A Pisanu, D Delogu, G Ciaccio, M Farulla, M Casati, L Laface, M De Luca, D Russello, S Latteri, M Longoni, E Masci, S Vigna, F C Campanile, N Foti, P Lepiane, A Balla, F Cantore, V Raveglia, F Borghi, G Giraudo, A Verzelli, A Budassi, A Patriti, D Foghetti, U Montin, L Amadio, G Anania, C Bombardini, Niccolò Fabbri, Carlo Feo, F Cianchi, A Manetti, M Lucchese, E Soricelli, G Ceccarelli, M Patiti, M Frascio, C Stabilini, M Filauro, A Barberis, M Troian, C Nagliati, R Campagnacci, A Maurizi, S Berti, A Gennai, A Marvaso, D D'Antonio, C V Feo, N Fabbri, L Mazzola, F Selvaggi, S Carini, F Costanzo, L Boccia, A Pascariello, N Perrotta, M Celiento, E Opocher, M Giovenzana, M Stella, F Ferrara, L Boni, E Abate, C Da Lio, V Valli, R Gelmini, F Serra, M Piccoli, D Gozzo, A Gattolin, D Sasia, A Balani, B Petronio, P G Calò, G L Canu, E Contarini, G Piatto, N Vettoretto, M Caprioli, M Braga, M F Chiappetta, P Maida, P Tammaro, G De Palma, M Milone, V Bottino, A Canfora, F Selvaggi, G Bagaglini, A Agrusa, M Barone, A Mirabella, M V Marino, G Gulotta, G Romano, M Sorrentino, S Ferfoglia, V Papagni, S Eramo, C Boselli, M Basti, V Caracino, G Moretto, M Inama, P Capelli, L Conti, A Muratore, M M Cuoghi, A Zerbinati, S Corso, M C Vasino, M Montuori, F Fidanza, A Lucchetta, A Giuliani, G Dinatale, F Zanzi, A Guariniello, S Bonilauri, G Frazzetta, M Garino, C Marafante, A Gioffrè, S R Del Monte, G Sganga, P Fransvea, M Grande, L Siragusa, G Sica, M Paola, D G Passantino, Marco Catani, F Ricci, E Lauro, E Facci, D Parini, M F Armellino, G Argenio, A Porcu, T Perra, P Bordoni, F Fleres, A Parisi, S Rossi, R Saracco, D Bono, T Viora, F Orlando, A Ferrero, A P Fontana, P De Paolis, D Visconti, F Quaglino, F Festa, S Palagi, G Lo Secco, M Morino, M E Allaix, A Salzano, G Tirone, M Motter, G Zanus, N Passuello, M Massani, R Tutino, N Manzini, S Terranova, R Merenda, S Nordio, S Zonta, F Lovisetto, A Guglielmi, T Campagnaro, E Amedeo, M Scollica, P Amodio, D Giannotti, S Olmi, A Oldani, Sartori, A, Podda, M, Botteri, E, Passera, R, Agresta, F, Arezzo, A, Guerrieri, M, Ortenzi, M, Cavallo, F, Zese, M, Prando, D, Restini, E, Cianci, P, Millo, P, Brachet Contul, R, Serrao, A, Abatini, F, Altomare, D, Picciariello, A, Chetta, G, Lattanzio, F, Tonini, V, Gori, A, Jovine, E, Mastrangelo, L, Sartarelli, L, Frena, A, Malpaga, A, Bertelli, F, Pignata, G, Andreuccetti, J, Sanna, S, Lares, B, Sechi, R, Cillara, N, Pisanu, A, Delogu, D, Ciaccio, G, Farulla, M, Casati, M, Laface, L, De Luca, M, Russello, D, Latteri, S, Longoni, M, Masci, E, Vigna, S, Campanile, F, Foti, N, Lepiane, P, Balla, A, Cantore, F, Raveglia, V, Borghi, F, Giraudo, G, Verzelli, A, Budassi, A, Patriti, A, Foghetti, D, Montin, U, Amadio, L, Anania, G, Bombardini, C, Fabbri, N, Feo, C, Cianchi, F, Manetti, A, Lucchese, M, Soricelli, E, Ceccarelli, G, Patiti, M, Frascio, M, Stabilini, C, Filauro, M, Barberis, A, Troian, M, Nagliati, C, Campagnacci, R, Maurizi, A, Berti, S, Gennai, A, Marvaso, A, D'Antonio, D, Mazzola, L, Selvaggi, F, Carini, S, Costanzo, F, Boccia, L, Pascariello, A, Perrotta, N, Celiento, M, Opocher, E, Giovenzana, M, Stella, M, Ferrara, F, Boni, L, Abate, E, Da Lio, C, Valli, V, Gelmini, R, Serra, F, Piccoli, M, Gozzo, D, Gattolin, A, Sasia, D, Balani, A, Petronio, B, Calo, P, Canu, G, Contarini, E, Piatto, G, Vettoretto, N, Caprioli, M, Braga, M, Chiappetta, M, Maida, P, Tammaro, P, De Palma, G, Milone, M, Bottino, V, Canfora, A, Bagaglini, G, Agrusa, A, Barone, M, Mirabella, A, Marino, M, Gulotta, G, Romano, G, Sorrentino, M, Ferfoglia, S, Papagni, V, Eramo, S, Boselli, C, Basti, M, Caracino, V, Moretto, G, Inama, M, Capelli, P, Conti, L, Muratore, A, Cuoghi, M, Zerbinati, A, Corso, S, Vasino, M, Montuori, M, Fidanza, F, Lucchetta, A, Giuliani, A, Dinatale, G, Zanzi, F, Guariniello, A, Bonilauri, S, Frazzetta, G, Garino, M, Marafante, C, Gioffre, A, Del Monte, S, Sganga, G, Fransvea, P, Grande, M, Siragusa, L, Sica, G, Paola, M, Passantino, D, Catani, M, Ricci, F, Lauro, E, Facci, E, Parini, D, Armellino, M, Argenio, G, Porcu, A, Perra, T, Bordoni, P, Fleres, F, Parisi, A, Rossi, S, Saracco, R, Bono, D, Viora, T, Orlando, F, Ferrero, A, Fontana, A, De Paolis, P, Visconti, D, Quaglino, F, Festa, F, Palagi, S, Lo Secco, G, Morino, M, Allaix, M, Salzano, A, Tirone, G, Motter, M, Zanus, G, Passuello, N, Massani, M, Tutino, R, Manzini, N, Terranova, S, Merenda, R, Nordio, S, Zonta, S, Lovisetto, F, Guglielmi, A, Campagnaro, T, Amedeo, E, Scollica, M, Amodio, P, Giannotti, D, Olmi, S, and Oldani, A

Subjects
medicine.medical_specialty, COVID-19 Pandemic, Coronavirus disease 2019 (COVID-19), Endoscopic surgery, NO, Appendectomy, Appendicitis, Machine learning, Cohort Studies, 03 medical and health sciences, 0302 clinical medicine, Postoperative Complications, Retrospective Studie, Pandemic, medicine, Humans, Appendiciti, Laparoscopy, Pandemics, Retrospective Studies, medicine.diagnostic_test, business.industry, COVID-19 Pandemic, Appendicitis, Appendicectomy, Machine learning, SARS-CoV-2, COVID-19, Length of Stay, medicine.disease, Settore MED/18, Surgery, Italy, 030220 oncology & carcinogenesis, appendicitis, COVID-19 pandemic, machine learning, appendectomy, cohort studies, humans, length of stay, pandemics, postoperative complications, retrospective studies, laparoscopy, 030211 gastroenterology & hepatology, Observational study, Original Article, Postoperative Complication, Appendicectomy, Cohort Studie, business, Complication, Cohort study, Human
Abstract

Major surgical societies advised using non-operative management of appendicitis and suggested against laparoscopy during the COVID-19 pandemic. The hypothesis is that a significant reduction in the number of emergent appendectomies was observed during the pandemic, restricted to complex cases. The study aimed to analyse emergent surgical appendectomies during pandemic on a national basis and compare it to the same period of the previous year. This is a multicentre, retrospective, observational study investigating the outcomes of patients undergoing emergent appendectomy in March–April 2019 vs March–April 2020. The primary outcome was the number of appendectomies performed, classified according to the American Association for the Surgery of Trauma (AAST) score. Secondary outcomes were the type of surgical technique employed (laparoscopic vs open) and the complication rates. One thousand five hundred forty one patients with acute appendicitis underwent surgery during the two study periods. 1337 (86.8%) patients met the inclusion criteria: 546 (40.8%) patients underwent surgery for acute appendicitis in 2020 and 791 (59.2%) in 2019. According to AAST, patients with complicated appendicitis operated in 2019 were 30.3% vs 39.9% in 2020 (p = 0.001). We observed an increase in the number of post-operative complications in 2020 (15.9%) compared to 2019 (9.6%) (p 24 h after admission (+ 58%), open surgery (+ 112%) and conversion to open surgery (+ 166%). In Italian hospitals, in March and April 2020, the number of appendectomies has drastically dropped. During the first pandemic wave, patients undergoing surgery were more frequently affected by more severe appendicitis than the previous year's timeframe and experienced a higher number of complications. Trial registration number and date: Research Registry ID 5789, May 7th, 2020

Published
2021

180. 3D modelling of the synthesis of copper nanoparticles by means of a DC transferred arc twin torch plasma system

Author

Vittorio Colombo, Matteo Gherardi, Marco Boselli, Boselli M., Gherardi M., and Colombo V.

Subjects
twin torch, Materials science, Acoustics and Ultrasonics, thermal plasma, Nanoparticle, chemistry.chemical_element, 02 engineering and technology, 01 natural sciences, 7. Clean energy, law.invention, Arc (geometry), law, nanoparticle synthesi, 0103 physical sciences, 010302 applied physics, Torch, Metallurgy, Plasma, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Copper, 3D modelling, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry, 0210 nano-technology
Abstract

An atmospheric pressure DC transferred arc twin torch thermal plasma system has been characterized by 3D simulation in order to assess its potential for the synthesis of Cu nanoparticles from solid precursors. The numerical model also takes into account the non-negligible effect on process temperature of radiative losses, transport and thermodynamic properties of Cu vapour. In the frame of design-oriented simulation and optimization of the synthesis process, mean diameter and yield of the synthetized nanoparticles have been investigated for different current levels, gas flow rates, precursor feed rates and nanoparticles model. Results show that evaporation efficiency is considerably high even at precursor feed rates up to 25 kg d-1, while the presence of vortices inside the chambers causes a significative loss of nanoparticles to the reactor walls, with a detrimental effect to the yield.

Published
2019

181. Experimental investigation on the interaction of a nanopulsed plasma jet with a liquid target

Author

Emanuele Simoncelli, Marco Boselli, Matteo Gherardi, Vittorio Colombo, Augusto Stancampiano, Stancampiano, A., Simoncelli, E., Boselli, M., Colombo, V., and Gherardi, M.

Subjects
010302 applied physics, Schlieren, Jet (fluid), Materials science, Turbulence, turbulence, Thermal ionization, liquid surface, Atmospheric-pressure plasma, impinging, Mechanics, Plasma, Condensed Matter Physics, 01 natural sciences, 010305 fluids & plasmas, electric field, Physics::Fluid Dynamics, Physics::Plasma Physics, Ionization, Electric field, jet, 0103 physical sciences, cold atmospheric pressure plasma
Abstract

Although the majority of atmospheric pressure plasma jet (APPJ) applications involve the interaction between the plasma and a surface, up to now the number of published papers focusing on this subject is limited, even though the nature of the target may strongly influence the plasma characteristics, the discharge structure, the generated reactive species, and consequently, the overall process. Under this framework, we investigated an APPJ impinging on a liquid surface and the effects of changing the stand-off distance, the applied peak voltage, and the pulse repetition frequency, looking at them as variable parameters often used to optimize plasma surface processes. Intensified charge-coupled device (iCCD) and Schlieren acquisitions suggest a key effect of gap width and peak voltage on the discharge morphology, velocity of the ionization front, and effluent fluid-dynamic behavior. The presence of a grounded liquid substrate enhances the electric field downstream of the source outlet: the smaller the gap the faster the ionization wave and the shorter the time for it to reach the surface. Consequently, a small gap favors the charging of the surface capacitance and the formation of surface ionization waves over the liquid target. Schlieren acquisitions highlight the formation of a transient turbulent structure propagating downstream of the gas flow, starting hundreds of microseconds after the initiation of the plasma discharge. The achieved results support the hypothesis that the formation of the turbulence is caused by a heating effect of the high-voltage electrode on the He gas flow. Another observed effect is the variation of the dimple caused by the He flow on the liquid surface as a consequence of the turbulence generated by the plasma discharge. The results presented here confirm how the gas dynamics and the discharge behavior are strongly affected by the presence of the liquid substrate and by its position with respect to the APPJ.

Published
2018

182. Numerical investigation of the joint impact of thermophoresis and radiative losses in induction plasma synthesis of copper nanoparticles

Author

Matteo Gherardi, Simone Bianconi, Marco Boselli, Vittorio Colombo, Bianconi, S., Boselli, M., Gherardi, M., and Colombo, V

Subjects
plasma modeling, Work (thermodynamics), Materials science, Acoustics and Ultrasonics, thermal plasma, copper nanoparticle, Nanotechnology, Process design, vapour radiation, 02 engineering and technology, Condensed Matter Physic, Acoustics and Ultrasonic, 01 natural sciences, Thermophoresis, 0103 physical sciences, Thermal, Radiative transfer, 010302 applied physics, Electronic, Optical and Magnetic Material, Mechanics, Plasma, Conical surface, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Plasma modeling, Electronic, Optical and Magnetic Materials, Surfaces, Coatings and Films, thermophoresi, 0210 nano-technology
Abstract

A numerical model for the simulation of the copper nanoparticles synthesis process by an induction thermal plasma system has been developed, taking into account the joint effects of radiative losses from the metallic vapour and thermophoretic transport of the synthetized nanoparticles on the process performance; the final aim of the work is that of setting up an accurate modelling tool for design-oriented simulation and optimization of the synthesis process. Radiative losses from copper vapour and thermophoresis have been taken into account for different reaction chamber geometries (a cylindrical one and one with a conical top section) combined with different quench gas injection strategies and different power levels, in order to evaluate the impact of these phenomena in process design strategies. The numerical results show that both these phenomena have a relevant impact on the process parameters for all the investigated cases, and that they should be taken into account in order to develop increasingly accurate models for process design and optimization.

Published
2017

183. Design-Oriented Modelling of Different Quenching Solutions in Induction Plasma Synthesis of Copper Nanoparticles

Author

Vittorio Colombo, Matteo Gherardi, Simone Bianconi, Marco Boselli, Bianconi, S., Boselli, M, Gherardi, M., and Colombo, V.

Subjects
Sticking coefficient, Materials science, General Chemical Engineering, Analytical chemistry, Nucleation, Evaporation, Nanoparticle, Condensed Matter Physic, 01 natural sciences, 010305 fluids & plasmas, 0103 physical sciences, Chemical Engineering (all), 010302 applied physics, Quenching, ING-IND/18 Fisica dei reattori nucleari, Atmospheric pressure, Chemistry (all), Plasma modelling, General Chemistry, Plasma, Thermal plasmas Plasma modelling Copper nanoparticles Vapour radiation Reaction chamber design, Reaction chamber design, Condensed Matter Physics, Thermal plasma, Vapour radiation, Surfaces, Coatings and Films, Chemical engineering, Particle, Copper nanoparticle
Abstract

The aim of this paper is to compare the effects of different mechanisms underlying the synthesis of copper nanoparticles using an atmospheric pressure radio-frequency induction thermal plasma. A design oriented modelling approach was used to parametrically investigate trends and impact of different parameters on the synthesis process through a thermo-fluid dynamic model coupled with electromagnetic field equations for describing the plasma behaviour and a moment method for describing nanoparticles nucleation, growth and transport. The effect of radiative losses from Cu vapour on the precursor evaporation efficiency is highlighted, with occurrence of loading effect even with low precursor feed rate due to the decrease in plasma temperature. A method to model nanoparticle deposition on a porous wall is proposed, in which a sticking coefficient is employed to model particle sticking on the porous wall used to carry a quench gas flow into the chamber. Two different reaction chamber designs combined with different quench gas injection strategies (injection through a porous wall for “active” quenching; injection of a shroud gas for “passive” quenching) are analysed in terms of process yield and size distribution of the synthetized nanoparticles. Conclusion can be drawn on the characteristics of each quenching strategy in terms of throughput and mean diameter of the synthesized nanoparticles.

Published
2017

184. The Cyclic Alternating Pattern Plays a Gate-Control on Periodic Limb Movements During Non-Rapid Eye Movement Sleep

Author

Guido Di Giovanni, Giovanni Buccino, Mirella Boselli, Maria Cristina Spaggiari, Mario Giovanni Terzano, Liborio Parrino, Parrino, L, Boselli, M, Buccino, G, Spaggiari, Mc, DI GIOVANNI, G, and Terzano, Mg.

Subjects
Adult, Male, Periodicity, medicine.medical_specialty, Physiology, Polysomnography, Nocturnal, Electroencephalography, Audiology, Non-rapid eye movement sleep, Arousal, Rhythm, Reference Values, Restless Legs Syndrome, Sleep Initiation and Maintenance Disorders, Physiology (medical), Humans, Medicine, Muscle, Skeletal, Cerebral Cortex, Motor Neurons, medicine.diagnostic_test, business.industry, Eye movement, Signal Processing, Computer-Assisted, Middle Aged, Neurology, Female, Neurology (clinical), medicine.symptom, Entrainment (chronobiology), business, Myoclonus
Abstract

Periodic limb movements in sleep (PLMS) is a disorder characterized by a cyclic pattern of motor phenomena and EEG changes (mostly arousals), both recurring at approximately 20- to 40-s intervals. The periodicity of the PLMS phenomena recalls the physiological EEG arousal rhythm of non-rapid eye movement (NREM) sleep known as the cyclic alternating pattern (CAP). During CAP, arousals and arousal-equivalent features do not appear as isolated events but periodically intrude (phase A) between intervals of background EEG activity (phase B). Though the A phases can be expressed by a variety of EEG patterns, each with a different arousal impact on polygraphic parameters, overall CAP is a sequence of biphasic cycles reflecting a condition of unstable sleep. Twelve middle-aged PLMS subjects complaining of poor sleep were polygraphically compared with 12 age-matched and gender-matched healthy volunteers (controls). With respect to controls, the PLMS recordings showed an enhancement of the more powerful arousals and presented significantly increased amounts of CAP time (+45 min) and CAP rate (+15%). Of all the jerks detected in NREM sleep, 92% occurred in CAP, with the great majority of limb movements (96%) associated with phase A. Ninety-four percent of the nocturnal jerks coupled with phase A started jointly with the onset of the phase or when the latter had already begun. In particular, most of the myoclonic events (67%) occurred in the first 2.5 s of the A phase. The CAP cycles coupled with periodic movements were significantly longer than those without motor events (+6.4 s). Compared to the American Sleep Disorders Association's rules for scoring EEG arousals, the CAP framework offers a more extensive insight into PLMS. In effect, the present study indicates an entrainment of nocturnal myoclonus by means of CAP and sheds light on the complex interactions between arousal mechanisms and motor phenomena during sleep.

Published
1996

187. Water Dynamics on Germinating Diaspores: Physiological Perspectives from Biophysical Measurements.

Author

Ribeiro-Oliveira JP, Ranal MA, and Boselli MA

Abstract

We demonstrated that classical biophysical measurements of water dynamics on germinating diaspores (seeds and other dispersal units) can improve the understanding of the germination process in a simpler, safer, and newer way. This was done using diaspores of cultivated species as a biological model. To calculate the water dynamics measurements (weighted mass, initial diffusion coefficient, velocity, and acceleration), we used the mass of diaspores recorded over germination time. Weighted mass of germinating diaspores has a similar pattern, independent of the physiological quality, species, or genetic improvement degree. However, the initial diffusion coefficient (related to imbibition per se ), velocity, and acceleration (related to the whole germination metabolism) are influenced by species characters, highlighting the degree of genetic improvement and physiological quality. Changes in the inflection of velocity curves demonstrated each phase of germination sensu stricto . There is no pattern related to the number of these phases, which could range between three and six. Regression models can demonstrate initial velocity and velocity increments for each phase, giving an idea of the management of germinative metabolism. Our finds demonstrated that germination is a polyphasic process with a species-specific pattern but still set by the degree of genetic improvement and (or) physiological quality of diaspores. Among the biophysical measurements, velocity has the greatest potential to define the germination metabolism., Competing Interests: The authors declare that there is no conflict of interest regarding the publication of this article., (Copyright © 2020 J. P. Ribeiro-Oliveira et al.)

Published
2020
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