Search results for "Sperimentale"
showing 10 items of 938 documents
Two-Color Radiation Generated in a Seeded Free-Electron Laser with Two Electron Beams.
2015
We present the experimental evidence of the generation of coherent and statistically stable two-color free-electron laser radiation obtained by seeding an electron beam double peaked in energy with a laser pulse single spiked in frequency. The radiation presents two neat spectral lines, with time delay, frequency separation, and relative intensity that can be accurately controlled. The analysis of the emitted radiation shows a temporal coherence and a shot-to-shot regularity in frequency significantly enhanced with respect to the self-amplified spontaneous emission. © 2015 American Physical Society. © 2015 American Physical Society.
L’apprendimento generativo e il reflective learningnella didattica universitaria: una ricerca con studenti universitari
2020
The present paper describes the results of a research carried out with 205 students attending the 2nd year of the degree course in Primary Education from the University of Palermo in A.Y. 2018-2019. Generative and reflective learning are the framework of the research, central in the teaching-learning process for the construction of professional, competent and responsible teachers. The research path wanted to verify the validity of the McDrury and Alterio Storytelling model (2003) in order to increase students reflective, narrative and critical competence, to promote generative learning and make students aware of their talents.
L’infanzia in gioco.Video education, Neuroeducation e sviluppo cognitivo-relazionale nei primi anni di vita
2020
La prospettiva del sistema integrato 0-6 previsto dal D.L. 65/2017 e la crescente eterogeneità morfologica delle classi della scuola italiana inducono giocoforza al rinnovamento complessivo del panorama scolastico italiano chiamando in causa un ripensamento epistemologico e prassico-metodologico della Pedagogia dell’Infanzia. A partire da tali considerazioni, in linea con una pista di studio e di ricerca avviata già nel 2015 presso l’Università di Palermo, il presente lavoro indaga la dimensione educativa del gioco a partire da due distinte angolazioni: quella della Neuroeducation e quella della Video education rispetto a due distinti ambiti: il mondo dei giochi e quello dei videogame, con …
L’Higher education in trasformazione: tra il potenziamento dell’employability e stakeholder view
2021
The higher education evolution passes through the enhancement of employability. It is necessary to focus on the construction of professional skills on the one hand, and on the other to create a bridge with the work field. An exploratory survey was conducted with stakeholders for the internship of the SPPEfF Department of the University of Palermo in the A.Y. 2019/2020 with the aim of: identifying the skills valued in working contexts in order to modify the study plans of the departmental courses for the A.Y. 2020/2021
OBSERVING HABITS OF MIND IN PRIMARY SCHOOL
2015
In this fast-moving 21st century, students need to learn to think before they act. Every school classshould be used as an opportunity to help students develop their habits of mind. A Habit of Mind is a disposition towards cleverly behaving when confronted with problems, the answers to which are not immediately known. When human experience dichotomies are confused by dilemmas, or come face to face with uncertainties, our most effective actions require drawing forth certain patterns of intellectual behavior. When we draw upon these intellectual resources, the results that are produced are more powerful, of higher quality and of greater significance than if we failed to employ those patterns o…
Measurement of the azimuthal ordering of charged hadrons with the ATLAS detector
2012
This paper presents a study of the possible ordering of charged hadrons in the azimuthal angle relative to the beam axis in high-energy proton-proton collisions at the Large Hadron Collider (LHC). A spectral analysis of correlations between longitudinal and transverse components of the momentum of the charged hadrons, driven by the search for phenomena related to the structure of the QCD field, is performed. Data were recorded with the ATLAS detector at center-of-mass energies of √s=900 GeV and √s=7 TeV. The correlations measured in a kinematic region dominated by low-pT particles are not well described by conventional models of hadron production. The measured spectra show features consis…
Precision measurement of D meson mass differences
2013
Using three- and four-body decays of D mesons produced in semileptonic b-hadron decays, precision measurements of D meson mass differences are made together with a measurement of the D-0 mass. The measurements are based on a dataset corresponding to an integrated luminosity of 1.0 fb(-1) collected in pp collisions at 7 TeV. Using the decay D-0 -> K+K-K-pi(+), the D-0 mass is measured to be M(D-0) = 1864.75 +/- 0.15 (stat) +/- 0.11 (syst) MeV/c(2). The mass differences M(D+) - M(D-0) = 4.76 +/- 0.12 (stat) +/- 0.07 (syst) MeV/c(2), M(D-s(+)) - M(D+) = 98.68 +/- 0.03 (stat) +/- 0.04 (syst) MeV/c(2) are measured using the D-0 -> K+K-pi(+)pi(-) and D-(s)(+) -> K+K-pi(+) modes.
Testing Hadronic Interactions at Ultrahigh Energies with Air Showers Measured by the Pierre Auger Observatory
2016
Ultrahigh energy cosmic ray air showers probe particle physics at energies beyond the reach of accelerators. Here we introduce a new method to test hadronic interaction models without relying on the absolute energy calibration, and apply it to events with primary energy 6-16 EeV (ECM=110-170 TeV), whose longitudinal development and lateral distribution were simultaneously measured by the Pierre Auger Observatory. The average hadronic shower is 1.33±0.16 (1.61±0.21) times larger than predicted using the leading LHC-tuned models EPOS-LHC (QGSJetII-04), with a corresponding excess of muons.
Measurement of hard double-parton interactions inW(???) + 2-jet events at $\sqrt{s}\,=7$ TeV with the ATLAS detector
2013
The production of W bosons in association with two jets in proton–proton collisions at a centre-of-mass energy of √s=7 TeV has been analysed for the presence of double-parton interactions using data corresponding to an integrated luminosity of 36 pb[superscript −1], collected with the ATLAS detector at the Large Hadron Collider. The fraction of events arising from double-parton interactions, f[superscript (D) over subscript DP], has been measured through the p[subscript T] balance between the two jets and amounts to f[superscript (D) over subscript DP] = 0.08 ± 0.01 (stat.) ± 0.02 (sys.) for jets with transverse momentum p[subscript T] > 20 GeV and rapidity |y| < 2.8. This corresponds to a …
Search for gamma-ray spectral lines with the DArk Matter Particle Explorer
2021
The DArk Matter Particle Explorer (DAMPE) is well suitable for searching for monochromatic and sharp $\gamma$-ray structures in the GeV$-$TeV range thanks to its unprecedented high energy resolution. In this work, we search for $\gamma$-ray line structures using five years of DAMPE data. To improve the sensitivity, we develop two types of dedicated data sets (including the BgoOnly data which is the first time to be used in the data analysis for the calorimeter-based gamma-ray observatories) and adopt the signal-to-noise ratio optimized regions of interest (ROIs) for different DM density profiles. No line signals or candidates are found between 10 and 300 GeV in the Galaxy. The constraints o…