Paolo Villani - Academia.edu (original) (raw)
Papers by Paolo Villani
Italian Journal of Pediatrics, 2015
On Recent Developments in Theoretical and Experimental General Relativity, Gravitation and Relativistic Field Theories (In 3 Volumes), 2002
ABSTRACT
Riparian vegetation play a central role in river ecosystems. They interact with water and sedimen... more Riparian vegetation play a central role in river ecosystems. They interact with water and sediment flows that influence its geomorphological processes (Gurnell, 2014). However, few studies have evidenced that the European black poplar (Populus nigra L.), a very common tree riparian “engineering species”, adapted its morphological and biomechanical traits to cope with the hydraulic force and the prolonged submersion periods, according to the dominant fluvial processes (Corenblit et al., 2014). This study assesses the morphological and biomechanical traits of two native European black poplar provenances of southern Italy managed under a Short Rotation Coppice (SRC) systems, which induces high physical disturbance regime comparable to the fluvial systems.
ABSTRACT A state-space approach to rainfall forecasting is presented. It is based upon a simple, ... more ABSTRACT A state-space approach to rainfall forecasting is presented. It is based upon a simple, operational stochastic model featuring some analogies with the hierarchical structure of pulses introduced by many stochastic models for the point precipitation process. The suggested procedure makes use of the state-space methodology, and consists of two stages. At the first stage, we define a Dynamic Generalized Linear Model in order to estimate, in a dynamic fashion, the time varying probability of rainfall occurence over a given interval of time, the Reference Time Window (RTW). The non-linear filtering problem is solved through a Bayesian recursive algorithm. The algorithm requires the specification of a likelihood function and a prior distribution for the pre- dictions. The posterior distribution is then evaluated recursively from the data as new observations become available. A measure of uncertainty is generated via the estima- tion of posterior distributions for predictions. At the second stage, using the estimated probabilities and, more precisely, their sampling distributions in different RTWs, a dynamic model for the distribution of the total rainfall depth over an assigned RTW is defined. The whole procedure has been conceived to make use of information com- ing from different sources. At both stages, non stochastic covariates, like information coming from different measurement stations or remotely sensed data, can be easily included in the model. The covariates may also act as trigger for the forecasting sys- tem. An application to rainfall data recorded in a dense rain-gauge network is pre- sented. Particular attention will be paid to the analysis of very extreme events, typical of mediterranean regions.
A hierarchical, three level approach for regional flood frequency analysis is proposed, together ... more A hierarchical, three level approach for regional flood frequency analysis is proposed, together with the two-component extreme value (TCEV) distribution as probabilistic model. The meaning,of the homogeneity,hypothesis is examined and discussed. Combined,analysis of rainfall and flood data is shown to improve flood estimation, with different ways of transferring information from the former to the latter, according to different spatial
International Journal of Pediatric Otorhinolaryngology, 2012
Ex utero Intrapartum Treatment (EXIT) is a technique to secure the fetal airway while oxygenation... more Ex utero Intrapartum Treatment (EXIT) is a technique to secure the fetal airway while oxygenation is maintained through utero-placental circulation. The aim of the study is to present three cases of fetal lymphatic malformation of the head and neck that required EXIT and to summarize EXIT details. The cases were studied before the delivery and EXIT was planned with a multidisciplinary team. The key factors of EXIT are considered and the type, stage and clinical score of the three lymphatic malformations are defined. In the three cases of EXIT the time working on placental support to secure the airway was 9, 7, and 9 min, respectively (from the hysterotomy to clamping the umbilical cord). Procedures performed on the airway were laryngo-tracheo-bronchoscopy in the first case, laryngoscopy and intubation in the second one, laryngoscopy, drainage of the lymphatic macro-cyst, and intubation in the third case. A sketching to detail the EXIT steps are presented: EXIT-Team Time Procedure list (EXIT-TTP list). Lymphatic malformations were classified as mixed (micro/macro-cystic) in two cases, and macro-cystic in one. de Serres Stage was IV, V and II. Therapy varied in the three neonates (surgery alone, surgery+Picibanil+Nd-YAG, or Picibanil alone). In case of prenatal suspicion of airway obstruction, EXIT should be planned with a multidisciplinary team. The EXIT-Team Time Procedure list (EXIT-TTP list), reviews the most critical phases of the procedure when different teams are working together. The type of lymphatic malformation, the anatomic location and the clinical score predict the outcome.
Developments in Earth Surface Processes, 2007
The Himalayan–Karakoram range is located in one of the most densely populated and very rapidly de... more The Himalayan–Karakoram range is located in one of the most densely populated and very rapidly developing world areas. Monitoring of atmospheric composition in this area can play a relevant role in evaluating the background conditions of the free troposphere and quantifying the pollution present at high altitudes, as well as in studying regional and long-range transport phenomena. Due to technical
Recent Developments in General Relativity, Genoa 2000, 2002
ABSTRACT
Journal of Maternal-Fetal and Neonatal Medicine, 2012
Proceedings of the National Academy of Sciences, 2008
Italian Journal of Pediatrics, 2015
On Recent Developments in Theoretical and Experimental General Relativity, Gravitation and Relativistic Field Theories (In 3 Volumes), 2002
ABSTRACT
Riparian vegetation play a central role in river ecosystems. They interact with water and sedimen... more Riparian vegetation play a central role in river ecosystems. They interact with water and sediment flows that influence its geomorphological processes (Gurnell, 2014). However, few studies have evidenced that the European black poplar (Populus nigra L.), a very common tree riparian “engineering species”, adapted its morphological and biomechanical traits to cope with the hydraulic force and the prolonged submersion periods, according to the dominant fluvial processes (Corenblit et al., 2014). This study assesses the morphological and biomechanical traits of two native European black poplar provenances of southern Italy managed under a Short Rotation Coppice (SRC) systems, which induces high physical disturbance regime comparable to the fluvial systems.
ABSTRACT A state-space approach to rainfall forecasting is presented. It is based upon a simple, ... more ABSTRACT A state-space approach to rainfall forecasting is presented. It is based upon a simple, operational stochastic model featuring some analogies with the hierarchical structure of pulses introduced by many stochastic models for the point precipitation process. The suggested procedure makes use of the state-space methodology, and consists of two stages. At the first stage, we define a Dynamic Generalized Linear Model in order to estimate, in a dynamic fashion, the time varying probability of rainfall occurence over a given interval of time, the Reference Time Window (RTW). The non-linear filtering problem is solved through a Bayesian recursive algorithm. The algorithm requires the specification of a likelihood function and a prior distribution for the pre- dictions. The posterior distribution is then evaluated recursively from the data as new observations become available. A measure of uncertainty is generated via the estima- tion of posterior distributions for predictions. At the second stage, using the estimated probabilities and, more precisely, their sampling distributions in different RTWs, a dynamic model for the distribution of the total rainfall depth over an assigned RTW is defined. The whole procedure has been conceived to make use of information com- ing from different sources. At both stages, non stochastic covariates, like information coming from different measurement stations or remotely sensed data, can be easily included in the model. The covariates may also act as trigger for the forecasting sys- tem. An application to rainfall data recorded in a dense rain-gauge network is pre- sented. Particular attention will be paid to the analysis of very extreme events, typical of mediterranean regions.
A hierarchical, three level approach for regional flood frequency analysis is proposed, together ... more A hierarchical, three level approach for regional flood frequency analysis is proposed, together with the two-component extreme value (TCEV) distribution as probabilistic model. The meaning,of the homogeneity,hypothesis is examined and discussed. Combined,analysis of rainfall and flood data is shown to improve flood estimation, with different ways of transferring information from the former to the latter, according to different spatial
International Journal of Pediatric Otorhinolaryngology, 2012
Ex utero Intrapartum Treatment (EXIT) is a technique to secure the fetal airway while oxygenation... more Ex utero Intrapartum Treatment (EXIT) is a technique to secure the fetal airway while oxygenation is maintained through utero-placental circulation. The aim of the study is to present three cases of fetal lymphatic malformation of the head and neck that required EXIT and to summarize EXIT details. The cases were studied before the delivery and EXIT was planned with a multidisciplinary team. The key factors of EXIT are considered and the type, stage and clinical score of the three lymphatic malformations are defined. In the three cases of EXIT the time working on placental support to secure the airway was 9, 7, and 9 min, respectively (from the hysterotomy to clamping the umbilical cord). Procedures performed on the airway were laryngo-tracheo-bronchoscopy in the first case, laryngoscopy and intubation in the second one, laryngoscopy, drainage of the lymphatic macro-cyst, and intubation in the third case. A sketching to detail the EXIT steps are presented: EXIT-Team Time Procedure list (EXIT-TTP list). Lymphatic malformations were classified as mixed (micro/macro-cystic) in two cases, and macro-cystic in one. de Serres Stage was IV, V and II. Therapy varied in the three neonates (surgery alone, surgery+Picibanil+Nd-YAG, or Picibanil alone). In case of prenatal suspicion of airway obstruction, EXIT should be planned with a multidisciplinary team. The EXIT-Team Time Procedure list (EXIT-TTP list), reviews the most critical phases of the procedure when different teams are working together. The type of lymphatic malformation, the anatomic location and the clinical score predict the outcome.
Developments in Earth Surface Processes, 2007
The Himalayan–Karakoram range is located in one of the most densely populated and very rapidly de... more The Himalayan–Karakoram range is located in one of the most densely populated and very rapidly developing world areas. Monitoring of atmospheric composition in this area can play a relevant role in evaluating the background conditions of the free troposphere and quantifying the pollution present at high altitudes, as well as in studying regional and long-range transport phenomena. Due to technical
Recent Developments in General Relativity, Genoa 2000, 2002
ABSTRACT
Journal of Maternal-Fetal and Neonatal Medicine, 2012
Proceedings of the National Academy of Sciences, 2008