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1,993 results on '"Rossi, Luca"'

151. Generalizations and properties of the principal eigenvalue of elliptic operators in unbounded domains

Author

Berestycki, Henri and Rossi, Luca

Subjects
Mathematics - Analysis of PDEs, 35J15, 35B09, 35B50, 35P15
Abstract

Using three different notions of generalized principal eigenvalue of linear second order elliptic operators in unbounded domains, we derive necessary and sufficient conditions for the validity of the maximum principle, as well as for the existence of positive eigenfunctions satisfying Dirichlet boundary conditions. Relations between these principal eigenvalues, their simplicity and several other properties are further discussed.

Published
2010

152. Air pollution and out-of-hospital cardiac arrest risk: a 7-year study from a highly polluted area

Author

Moderato, Luca, primary, Aschieri, Daniela, additional, Lazzeroni, Davide, additional, Rossi, Luca, additional, Biagi, Andrea, additional, Binno, Simone Maurizio, additional, Monello, Alberto, additional, Pelizzoni, Valentina, additional, Sticozzi, Concetta, additional, Zanni, Alessia, additional, Capucci, Alessandro, additional, Nani, Stefano, additional, Ardissino, Diego, additional, Nicolini, Francesco, additional, and Niccoli, Giampaolo, additional

Published
2023
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153. Liouville type results for periodic and almost periodic linear operators

Author

Rossi, Luca

Subjects
Mathematics - Analysis of PDEs, 35B10, 35B15, 34C27, 35B05
Abstract

We are concerned with some extensions of the classical Liouville theorem for bounded harmonic functions to solutions of more general equations. We deal with entire solutions of periodic and almost periodic parabolic equations including the elliptic framework as a particular case. We derive a Liouville type result for periodic operators as a consequence of a result for operators periodic in just one variable, which is new even in the elliptic case. More precisely, we show that if $c\leq0$ and $a_{ij}, b_i, c, f$ are periodic in the same space/time direction, with the same period, then any bounded solution $u$ of $$\partial_t u-a_{ij}(x,t)\partial_{ij}u-b_i(x,t)\partial_iu-c(x,t)u=f(x,t),\quad x\in\R^N,\ t\in\R,$$ is periodic in that direction. We then derive the following Liouville type result: if $c\leq0, f\equiv0$ and $a_{ij}, b_i, c$ are periodic in all the space/time variables, with the same periods, then the space of bounded solutions of the above equation has at most dimension one. In the case of the equation $\partial_t u-Lu=f(x,t)$, with $L$ periodic elliptic operator independent of $t$, the hypothesis $c\leq0$ can be weaken by requiring that the periodic principal eigenvalue of $-L$ is nonnegative. Instead, the periodicity assumption cannot be relaxed, because we explicitly exhibit an almost periodic function $b$ such that the space of bounded solutions of $u''+b(x)u'=0$ in $\R$ has dimension 2, and it is generated by the constant solution and a non-almost periodic solution. Next, a sufficient condition for any bounded solution to be almost periodicis derived. We also treat the case of periodic domains under either Dirichlet or Robin boundary conditions., Comment: 27 pages, 1 figure

Published
2008
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156. Adaptive Feature Selection Based on the Most Informative Graph-Based Features

Author

Cui, Lixin, Jiao, Yuhang, Bai, Lu, Rossi, Luca, Hancock, Edwin R., Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Pandu Rangan, C., Editorial Board Member, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Weikum, Gerhard, Series Editor, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Foggia, Pasquale, editor, Liu, Cheng-Lin, editor, and Vento, Mario, editor

Published
2017
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157. Measuring Vertex Centrality Using the Holevo Quantity

Author

Rossi, Luca, Torsello, Andrea, Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Pandu Rangan, C., Editorial Board Member, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Weikum, Gerhard, Series Editor, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Foggia, Pasquale, editor, Liu, Cheng-Lin, editor, and Vento, Mario, editor

Published
2017
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158. A Nested Alignment Graph Kernel Through the Dynamic Time Warping Framework

Author

Bai, Lu, Rossi, Luca, Cui, Lixin, Hancock, Edwin R., Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Pandu Rangan, C., Editorial Board Member, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Weikum, Gerhard, Series Editor, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Foggia, Pasquale, editor, Liu, Cheng-Lin, editor, and Vento, Mario, editor

Published
2017
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159. Bruno Zevi e la didattica dell'architettura

Author

AA.VV., Gianpaola Spirito, Francesca Romana Castelli, Piero Ostilio Rossi, Luca Porqueddu and AA.VV., Gianpaola Spirito, Francesca Romana Castelli, Piero Ostilio Rossi, Luca Porqueddu

Published
2019

160. Sarcoptic Mange of Fox Origin in Multiple Farm Animals and Scabies in Humans, Switzerland, 2018

Author

Pisano, Simone R.R., Ryser-Degiorgis, Marie-Pierre, Rossi, Luca, Peano, Andrea, Keckeis, Karin, and Roosje, Petra

Subjects
Goats, Scabies, Death, Skin, Wildlife, Public health, Health
Abstract

The Sarcoptes scabiei mite is the causative agent of scabies in humans and sarcoptic mange in animals (1). Scabies is considered a neglected reemerging disease of public health concern (2). [...]

Published
2019
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165. Spread of Zika virus in the Americas

Author

Zhang, Qian, Sun, Kaiyuan, Chinazzi, Matteo, Pastore y Piontti, Ana, Dean, Natalie E., Rojas, Diana Patricia, Merler, Stefano, Mistry, Dina, Poletti, Piero, Rossi, Luca, Bray, Margaret, Halloran, M. Elizabeth, Longini, Ira M., and Vespignani, Alessandro

Published
2017

168. Supplementary material to "Impact-based flood forecasting in the Greater Horn of Africa"

Author

Alfieri, Lorenzo, primary, Libertino, Andrea, additional, Campo, Lorenzo, additional, Dottori, Francesco, additional, Gabellani, Simone, additional, Ghizzoni, Tatiana, additional, Masoero, Alessandro, additional, Rossi, Lauro, additional, Rudari, Roberto, additional, Testa, Nicola, additional, Trasforini, Eva, additional, Amdihun, Ahmed, additional, Ouma, Jully, additional, Rossi, Luca, additional, Tramblay, Yves, additional, Wu, Huan, additional, and Massabò, Marco, additional

Published
2023
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170. Impact-based flood forecasting in the Greater Horn of Africa

Author

Alfieri, Lorenzo, primary, Libertino, Andrea, additional, Campo, Lorenzo, additional, Dottori, Francesco, additional, Gabellani, Simone, additional, Ghizzoni, Tatiana, additional, Masoero, Alessandro, additional, Rossi, Lauro, additional, Rudari, Roberto, additional, Testa, Nicola, additional, Trasforini, Eva, additional, Amdihun, Ahmed, additional, Ouma, Jully, additional, Rossi, Luca, additional, Tramblay, Yves, additional, Wu, Huan, additional, and Massabò, Marco, additional

Published
2023
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173. The Average Mixing Matrix Signature

Author

Rossi, Luca, Severini, Simone, Torsello, Andrea, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Robles-Kelly, Antonio, editor, Loog, Marco, editor, Biggio, Battista, editor, Escolano, Francisco, editor, and Wilson, Richard, editor

Published
2016
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174. Edge Centrality via the Holevo Quantity

Author

Lockhart, Joshua, Minello, Giorgia, Rossi, Luca, Severini, Simone, Torsello, Andrea, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Robles-Kelly, Antonio, editor, Loog, Marco, editor, Biggio, Battista, editor, Escolano, Francisco, editor, and Wilson, Richard, editor

Published
2016
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183. Impact-based flood forecasting in the Greater Horn of Africa.

Author

Alfieri, Lorenzo, Libertino, Andrea, Campo, Lorenzo, Dottori, Francesco, Gabellani, Simone, Ghizzoni, Tatiana, Masoero, Alessandro, Rossi, Lauro, Rudari, Roberto, Testa, Nicola, Trasforini, Eva, Amdihun, Ahmed, Ouma, Jully, Rossi, Luca, Tramblay, Yves, Wu, Huan, and Massabò, Marco

Subjects
FLOOD forecasting, WEATHER forecasting, WATERSHEDS, FLOODS, AFRICANS, FLOOD risk, RISK assessment
Abstract

Every year Africa is hit by extreme floods which, combined with high levels of vulnerability and increasing population exposure, often result in humanitarian crises and population displacement. Impact-based forecasting and early warning for natural hazards is recognized as a step forward in disaster risk reduction, thanks to its focus on people, livelihoods, and assets at risk. Yet, the majority of the African population is not covered by any sort of early warning system. This article describes the setup and the methodological approach of Flood-PROOFS East Africa, an impact-based riverine flood forecasting and early warning system for the Greater Horn of Africa (GHA), with a forecast range of 5 d. The system is based on a modeling cascade relying on distributed hydrological simulations forced by ensemble weather forecasts, link to inundation maps for specific return period, and application of a risk assessment framework to estimate population and assets exposed to upcoming floods. The system is operational and supports the African Union Commission and the Disaster Operation Center of the Intergovernmental Authority on Development (IGAD) in the daily monitoring and early warning from hydro-meteorological disasters in eastern Africa. Results show a first evaluation of the hydrological reanalysis at 78 river gauging stations and a semi-quantitative assessment of the impact forecasts for the catastrophic floods in Sudan and in the Nile River basin in summer 2020. More extensive quantitative evaluation of the system performance is envisaged to provide its users with information on the model reliability in forecasting extreme events and their impacts. [ABSTRACT FROM AUTHOR]

Published
2024
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184. Teachers during COVID-19: Examining burnout levels and their work-life.

Author

Rossi, Luca, Zanetti, Margot, and Pasca, Maria Giovina

Subjects
PSYCHOLOGICAL burnout, ONLINE education, WELL-being, STRUCTURAL equation modeling, CONFIDENCE intervals, JOB stress, PSYCHOLOGY of teachers, WORK-life balance, FACTOR analysis, DESCRIPTIVE statistics, COVID-19 pandemic
Abstract

BACKGROUND: In March 2020, with the scope to reduce the spread of COVID-19, most national governments around the world canceled in-person education and moved to online learning. Therefore, teachers and students had to adapt a new way of teaching. Most of Italian teachers never had such an experience before and encountered difficulties in effectively carrying out this process on their own. Difficulties that can naturally increase anxiety and stress, leading, in situations perceived as extreme, to burnout syndrome. OBJECTIVES: This paper endeavored to verify levels of job stress and burnout of Italian teachers caused by the COVID-19 pandemic using the validated Maslach Burnout Inventory-General. This study aimed to measure the association among the three main dimensions of burnout and the variables of teachers' personal and working lives that changed due to COVID-19. METHOD: The aim of this paper was to verify burnout state and to measure the association among the three dimensions of burnout and the personal and working lives of Italian teachers using structural equation model analysis. The analysis was conducted in December 2021 and considered the situation in which the Italian teachers (from primary to middle and upper school) are working since March 2020. RESULTS: The results showed that teachers were emotionally exhausted; they did not feel able to fully fulfill their task towards the students. This involved a high absenteeism, a lower quality of work performance and the impossibility of making an objective evaluation of the students with an inevitable flattening of the class level. In contrast, the study shows that teachers who experienced few problems had relatively low levels of burnout. CONCLUSION: The findings brought out some proposals to reduce the risk of burnout and increase the individual well-being of schoolwork organization with positive effects on the lives of students: to strengthen social identity, to avoid a full-time online connection, to promote a psychological support service and to promote resilience training. [ABSTRACT FROM AUTHOR]

Published
2024
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185. Charting the Next Pandemic

Author

Pastore y Piontti, Ana, primary, Perra, Nicola, additional, Rossi, Luca, additional, Samay, Nicole, additional, and Vespignani, Alessandro, additional

Published
2019
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187. DATA, DATA, AND MORE DATA

Author

Pastore y Piontti, Ana, primary, Perra, Nicola, additional, Rossi, Luca, additional, Samay, Nicole, additional, and Vespignani, Alessandro, additional

Published
2018
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194. A study on well-being/discomfort of teachers and reflexivity in self-assessment processes of a comprehensive school in Rome

Author

Rossi Luca, Castellana Giuseppina, Botta Emanuela, Rossi, Luca, Castellana, Giuseppina, and Botta, Emanuela

Subjects
riflessività professionale, autovalutazione, benessere/disagio insegnanti, formazione docenti, istituto comprensivo
Abstract

Il contributo riguarda alcune iniziative di autovalutazione di un istituto comprensivo di Roma (scuola primaria e secondaria di I grado) negli anni 2021-2022. Si illustrano in particolare i risultati della somministrazione ai docenti della scuola di un’intervista scritta semi-strutturata sulle condizioni di benessere/disagio elaborata da alcuni docenti in collaborazione con l’Università di Roma Tre e del questionario “Quando insegno” sulla riflessività elaborato da Sapienza Università di Roma (Botta, 2022). I risultati sono in linea con quelli di altre indagini (Gozzoli, 2017) e mostrano una scuola in cui prevalgono i fattori benessere da valorizzare, ma non mancano quelli di disagio su cui riflettere. In ultimo si sottolinea come le iniziative di autovalutazione in una scuola che fa ricerca su sé stessa possano diventare esperienze di (auto)formazione per i propri insegnanti e di miglioramento per tutto l’istituto.

Published
2023

195. An Edge-Based Matching Kernel Through Discrete-Time Quantum Walks

Author

Bai, Lu, Zhang, Zhihong, Ren, Peng, Rossi, Luca, Hancock, Edwin R., Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Murino, Vittorio, editor, and Puppo, Enrico, editor

Published
2015
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196. A Quantum Jensen-Shannon Graph Kernel Using Discrete-Time Quantum Walks

Author

Bai, Lu, Rossi, Luca, Ren, Peng, Zhang, Zhihong, Hancock, Edwin R., Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Liu, Cheng-Lin, editor, Luo, Bin, editor, Kropatsch, Walter G., editor, and Cheng, Jian, editor

Published
2015
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200. Role of comorbidities on the mortality in patients with SARS-CoV-2 infection: an Italian cohort study

Author

VERGARA, Pasquale, primary, ROSSI, Luca, additional, BIAGI, Andrea, additional, FALASCONI, Giulio, additional, PANNONE, Luigi, additional, ZANNI, Alessia, additional, STICOZZI, Concetta, additional, COMASTRI, Greta, additional, GANDOLFI, Stefano, additional, GODINO, Cosmo, additional, MALAGOLI, Alessandro, additional, and VILLANI, Giovanni Q., additional

Published
2023
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