107 research outputs found
A general conformal framework for regular cusp beams
No full textIn the last decades, structured optics unveiled a vast diversity of spatial modes and configurations to customize optical beams, in combination with a rich portfolio of techniques to control the degrees of freedom of light. Among all, accelerating cusp beams have known increasing attention, while conformal mappings have become popular as efficient and scalable methods for beam shaping and manipulation. In this work, we bridge the gap between these two fields, presenting a conformal framework to describe the generation and propagation of the so-called regular polygon beams. In particular, we show how their peculiar regular structure of cusps can be described as the envelope of hypocycloid caustics generated by a circular-sector transformation acting on a standard input beam. The good agreement between theory, numerical simulations, and experimental data confirms the validity of the model developed in the stationary phase approximation, providing an elegant analytical tool to describe the generation and control of regular cusp beams
Samuele R. Bacchiocchi and Family
No full textSeventh-day Adventist author and theologian, Samuele R. Bacchiocchi and his wife and their children at a graduation ceremony at Pontifical University
sd920/FIJI-macros-for-IHC-and-SHG-analysis: Batch Split Channels (3 channels)
No full textThis macro allows to split channels for Z-stack .tiff files and save them in a new folder in batch mode.
Author: Samuele Di Carmine, [email protected]
Version 1.0
July 13, 2021
//License: BSD3
Copyright 2021 Samuele Di Carmine, Imperial College Londo
Samuele R. Bacchiocchi
No full textSamuele R. Bacchiocchi was a Seventh-day Adventist author and theologian best known for his work on the Sabbath in Christianity, particularly in the historical work "From Sabbath to Sunday," based on his doctoral thesis from the Pontifical Gregorian University. Bacchiocchi defended the validity of the Feasts of the Lord, situated in Leviticus 23. He wrote two books on the subject. He was also known within the Seventh-day Adventist church for his opposition to rock and contemporary Christian music, jewelry, the celebration of Christmas and Easter, certain dress standards, and alcohol. This photograph was taken during a graduation ceremony from Pontifical University
The Impact of the COVID-19 Emergency on Local Vehicular Traffic and Its Consequences for the Environment: The Case of the City of Reggio Emilia (Italy)
No full textfirst_pagesettings
Open AccessArticle
The Impact of the COVID-19 Emergency on Local Vehicular Traffic and Its Consequences for the Environment: The Case of the City of Reggio Emilia (Italy)
by Samuele Marinello 1,*OrcID,Francesco Lolli 1,2 andRita Gamberini 1,2OrcID
1
En&Tech Interdepartmental Center, University of Modena and Reggio Emilia, 42124 Reggio Emilia, Italy
2
Department of Sciences and Methods for Engineering, University of Modena and Reggio Emilia, 42122 Reggio Emilia, Italy
*
Author to whom correspondence should be addressed.
Sustainability 2021, 13(1), 118; https://doi.org/10.3390/su13010118
Received: 3 December 2020 / Revised: 21 December 2020 / Accepted: 22 December 2020 / Published: 24 December 2020
(This article belongs to the Special Issue 8th World Sustainability Forum—Selected Papers)
Download PDF Browse Figures
Abstract
The COVID-19 health emergency has imposed the need to limit and/or stop non-essential economic and commercial activities and movement of people. The objective of this work is to report an assessment of the change in vehicle flows and in air quality of a specific study area in the north of Italy, comparing the periods February–May 2020 and February–May 2019. Circulating vehicles have been measured at nine characteristic points of the local road network of the city of Reggio Emilia (Italy), while atmospheric pollutant concentrations have been analysed using data extracted from the regional air quality monitoring network. The results highlight a rapid decline in the number of vehicles circulating in 2020 (with values of up to −82%). This has contributed to a reduction in air concentrations of pollutants, in particular for NO2 and CO (over 30% and over 22%, respectively). On the other hand, O3 has increased (by about +13%), but this is expected. Finally, the particulate matter grew (about 30%), with a behaviour similar to the whole regional territory. The empirical findings of this study provide some indications and useful information to assist in understanding the effects of traffic blocking in urban areas on air quality
L'Alcesti di Samuele di Alberto Savinio: studio dell'opera e confronto con l'Alcesti di Euripide
No full textLa tesi si propone di confrontare l’Alcesti di Euripide, tragedia greca messa in scena nel 438 a.C. e l’Alcesti di Samuele di Alberto Savinio, rappresentata per la prima volta al Piccolo Teatro di Milano nel 1950. Il primo capitolo fornisce informazioni biografiche sull’autore. Il secondo capitolo raccoglie e descrive gli interventi sulla figura di Alcesti pubblicati da Savinio sui giornali ed esamina le fonti dell’opera teatrale. Il terzo capitolo è dedicato all’illustrazione delle due opere. Nel quarto capitolo si procede all’analisi e al confronto. Nell’ultimo capitolo si presentano alcune considerazioni sul metateatro, sulla trama, sui personaggi e sui temi principali dell’Alcesti di Samuele.
The aim of this work is to compare the Greek tragedy Alcesti by Euripides, performed on stage in 438 B.C., with the Alcesti di Samuele by Alberto Savinio, first performed at the Piccolo Teatro in Milan in 1950. The first chapter provides biographical information about the Author. The second chapter collects and describes the works about the character of Alcesti published by Savinio on newspapers and examines the sources of the play. The third chapter is about the description of the two works. The fourth chapter contains their analysis and comparison. In the last chapter some considerations about metatheatre and about the plot, the characters and the main themes of the Alcesti di Samuele are carried out
Samuele R. Bacchiocchi
No full textSamuele R. Bacchiocchi was a Seventh-day Adventist author and theologian, best known for his work on the Sabbath in Christianity, particularly in the historical work "From Sabbath to Sunday," based on his doctoral thesis from the Pontifical Gregorian University. Bacchiocchi defended the validity of the Feasts of the Lord, situated in Leviticus 23, he wrote two books on the subject. He was also known within the Seventh-day Adventist church for his opposition to rock and contemporary Christian music, jewelry, the celebration of Christmas and Easter, certain dress standards, and alcohol. Bacchiocchi earned a Bachelor of Arts degree in theology from Newbold College in England, which was followed by a Master of Arts and Bachelor of Divinity at Andrews University in Michigan, United States in 1964. Bacchiocchi moved with his wife Anna to Kuyera, Shashamane district, Ethiopia, where he lectured in Bible and history. Bacchiocchi taught in the religion department of Andrews University from 1974 until his retirement in 2000. He taught theology and church history. He regularly presented seminars worldwide, and wrote many self-published books and articles on biblical topics. He was married to Anna Gandin Bacchiocchi. They had three children
Studio dell’interazione tra un fascio di particelle energetiche e il plasma di DTT tramite modelli semplificati
No full textLa tesi affronta l'argomento dell'iniezione di un fascio di particelle neutre (NBI - Neutral Beam Injection) per un tokamak e della sua interazione con un plasma fusionisico. Dopo una prima parte dedicata alla descrizione di un sistema NBI e della fisica alla base dell'interazione con il plasma, vengono riassunti i principali modelli e tecniche numeriche utilizzati per la descrizione dei fenomeni considerati. Viene poi descritto brevemente il codice METIS, che, nell'ultima parte della tesi, è utilizzato per effettuare una scansione parametrica dell'energia di iniezione. L'effetto di queste variazioni sui principali parametri di plasma viene presentato per il tokamak DTT, attualmente in fase di costruzione al centro ENEA di Frascati.
This work deals with the topic of Neutral Beam Injection (NBI) for a tokamak and with the interaction between neutral beam and fusion plasmas. After a first part, dedicated to the description of a NBI system and the physics behind its interaction with the plasma, some of the models and numerical techniques involved in the beam description are listed. The METIS code is then briefly described and used to perform a parametric scan in injection energy, to simulate the behavior of the main plasma parameters of the DTT tokamak under construction at the ENEA Frascati center.ope
Studio dell’interazione tra un fascio di particelle energetiche e il plasma di DTT tramite modelli semplificati
No full textLa tesi affronta l'argomento dell'iniezione di un fascio di particelle neutre (NBI - Neutral Beam Injection) per un tokamak e della sua interazione con un plasma fusionisico. Dopo una prima parte dedicata alla descrizione di un sistema NBI e della fisica alla base dell'interazione con il plasma, vengono riassunti i principali modelli e tecniche numeriche utilizzati per la descrizione dei fenomeni considerati. Viene poi descritto brevemente il codice METIS, che, nell'ultima parte della tesi, è utilizzato per effettuare una scansione parametrica dell'energia di iniezione. L'effetto di queste variazioni sui principali parametri di plasma viene presentato per il tokamak DTT, attualmente in fase di costruzione al centro ENEA di Frascati.
This work deals with the topic of Neutral Beam Injection (NBI) for a tokamak and with the interaction between neutral beam and fusion plasmas. After a first part, dedicated to the description of a NBI system and the physics behind its interaction with the plasma, some of the models and numerical techniques involved in the beam description are listed. The METIS code is then briefly described and used to perform a parametric scan in injection energy, to simulate the behavior of the main plasma parameters of the DTT tokamak under construction at the ENEA Frascati center
Investigation of coherent emission of plasmonic nanolasers
No full textreservedIn the last two decades, a considerable amount of research has been done in the field of nanolasers, with the purpose of building coherent light sources with limited size and low pump thresholds.
This work deals with the topic of plasmonic nanolasers, with the main purpose of analyzing their emission properties. Plasmonic nanolasers are devices in which light is coupled to matter at the nanoscale, providing a source of coherent light without the need for macroscopic feedback cavities. This opens the door for numerous applications, mainly in the field of integrated photonics and sensing. After a first part, dedicated to a historical and theoretical introduction to nanolasers, some experimental data are reported. Two samples (both produced using Electron Beam Lithography) have been analyzed: a 2D square Au nanodisk array emitting in the near-infrared region and a 2D hexagonal Al nanocone array with emission in the visible range.
The first sample is made of Au nanodisks arranged in a 2D square lattice with a spacing of 600 nm. Its morphology was first analyzed with imaging techniques, such as Atomic Force Microscopy and Scanning Electron Microscopy. Finite-elements simulations with COMSOL Multiphysics allowed to study the extinction map and to select a suitable emitter (IR-140) to be coupled with the nanostructure. A layer of a liquid solution of IR-140 in Dimethyl sulfoxide (DMSO) has been placed over the structure and its emission properties have been studied with photoluminescence techniques. Lasing was observed at the Γ point of the reciprocal lattice, corresponding to the normal direction with respect to the array surface. The emission map and the lasing properties were also investigated and analyzed. After this characterization, a ~150-nm-thick silica layer was deposited on the array with the purpose of creating a spacer between the nanoparticles and the emitting molecules. Lasing emission was observed, but with a higher threshold and larger linewidth with respect to the original sample, meaning that plasmonic near-field properties play a role in the nanolasing process, but the lattice dispersion properties of the array still make it possible to achieve lasing.
The second sample is made of Al truncated cones, arranged in a 2D hexagonal array, with a lattice spacing of 475 nm and a solid layer of Poly(methyl methacrylate) doped with an organic dye (Lumogen F305 Red) of about 300 nm thickness. Its emission properties have been analyzed using the same techniques as for the square array. In this sample the polarization and temporal coherence of the emitted light have also been studied. The coherent beam was proven not to be linearly polarized, as expected due to symmetry reasons from emission at the Γ point of the reciprocal lattice. Moreover, the coherence length resulted on the order of millimeters, a very promising value that opens possibilities to new technological applications.In the last two decades, a considerable amount of research has been done in the field of nanolasers, with the purpose of building coherent light sources with limited size and low pump thresholds.
This work deals with the topic of plasmonic nanolasers, with the main purpose of analyzing their emission properties. Plasmonic nanolasers are devices in which light is coupled to matter at the nanoscale, providing a source of coherent light without the need for macroscopic feedback cavities. This opens the door for numerous applications, mainly in the field of integrated photonics and sensing. After a first part, dedicated to a historical and theoretical introduction to nanolasers, some experimental data are reported. Two samples (both produced using Electron Beam Lithography) have been analyzed: a 2D square Au nanodisk array emitting in the near-infrared region and a 2D hexagonal Al nanocone array with emission in the visible range.
The first sample is made of Au nanodisks arranged in a 2D square lattice with a spacing of 600 nm. Its morphology was first analyzed with imaging techniques, such as Atomic Force Microscopy and Scanning Electron Microscopy. Finite-elements simulations with COMSOL Multiphysics allowed to study the extinction map and to select a suitable emitter (IR-140) to be coupled with the nanostructure. A layer of a liquid solution of IR-140 in Dimethyl sulfoxide (DMSO) has been placed over the structure and its emission properties have been studied with photoluminescence techniques. Lasing was observed at the Γ point of the reciprocal lattice, corresponding to the normal direction with respect to the array surface. The emission map and the lasing properties were also investigated and analyzed. After this characterization, a ~150-nm-thick silica layer was deposited on the array with the purpose of creating a spacer between the nanoparticles and the emitting molecules. Lasing emission was observed, but with a higher threshold and larger linewidth with respect to the original sample, meaning that plasmonic near-field properties play a role in the nanolasing process, but the lattice dispersion properties of the array still make it possible to achieve lasing.
The second sample is made of Al truncated cones, arranged in a 2D hexagonal array, with a lattice spacing of 475 nm and a solid layer of Poly(methyl methacrylate) doped with an organic dye (Lumogen F305 Red) of about 300 nm thickness. Its emission properties have been analyzed using the same techniques as for the square array. In this sample the polarization and temporal coherence of the emitted light have also been studied. The coherent beam was proven not to be linearly polarized, as expected due to symmetry reasons from emission at the Γ point of the reciprocal lattice. Moreover, the coherence length resulted on the order of millimeters, a very promising value that opens possibilities to new technological applications
- …
