Search results for "arches"

showing 4 items of 34 documents

Optical pulsations from a transitional millisecond pulsar

2017

Weakly magnetic, millisecond spinning neutron stars attain their very fast rotation through a 1E8-1E9 yr long phase during which they undergo disk-accretion of matter from a low mass companion star. They can be detected as accretion-powered millisecond X-ray pulsars if towards the end of this phase their magnetic field is still strong enough to channel the accreting matter towards the magnetic poles. When mass transfer is much reduced or ceases altogether, pulsed emission generated by particle acceleration in the magnetosphere and powered by the rotation of the neutron star is observed, preferentially in the radio and gamma-ray bands. A few transitional millisecond pulsars that swing betwee…

TELESCOPERAYAstrophysics::High Energy Astrophysical PhenomenaMagnetosphereFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesSEARCHESSettore FIS/05 - Astronomia E AstrofisicaPulsarMillisecond pulsarSIGNALS0103 physical sciencesAstrophysics::Solar and Stellar AstrophysicsPSR J1023+0038ACCRETION010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Millisecond010308 nuclear & particles physicsAstrophysics::Instrumentation and Methods for AstrophysicsAstronomy and AstrophysicsXSS J12270-4859Accretion (astrophysics)STATEParticle accelerationNeutron starVARIABILITYPolarAstrophysics::Earth and Planetary AstrophysicsEMISSIONAstrophysics - High Energy Astrophysical PhenomenaXSS J12270-4859; PSR J1023+0038; Ray; telescope; accretion; emission; variability; searches; signals; state
researchProduct

INNOVAZIONE DEI MATERIALI NATURALI: TERRA E NANOTUBI DI ARGILLA PER UNA SFIDA SOSTENIBILE

2019

All’interno del dibattito culturale che vede la questione ambientale come prioritaria e con riferimento a studi e ricerche che negli ultimi anni hanno promosso materiali compositi a base di terra cruda, gli Autori, consapevoli della necessità che il rapporto fra Progetto e Materia debba assumere una nuova centralità supportato dalle specificità della Tecnologia dell’Architettura, illustrano le risultanze di una sperimentazione che ha l’obiettivo di migliorare le prestazioni della terra cruda con l’apporto delle nanotecnologie, sviluppando un ‘nuovo materiale’ con una ridotta embodied energy e una ridotta quantità di emissioni di CO2 in atmosfera.

Within the cultural debate that considers the environmental issue as a priority and with reference to the studies and researches that over the last years have supported compound materials containing rammed earth the Authors aware of the need of giving to the relationship of Project and Matter a key role supported by the characteristics of Architectural Technology show the results of an experimentation that aims to improve the performance of rammed earth with the contribution of nanotechnologies developing a ‘new material’ with a reduced embodied energy and a reduced amount of CO2 emissions into the atmosphere.Settore ICAR/12 - Tecnologia Dell'Architettura
researchProduct

Spectral shapes of forbidden argon β decays as background component for rare-event searches

2018

The spectral shape of the electrons from the two first-forbidden unique ${\beta }^{-}$ decays of 39Ar and 42Ar were calculated for the first time to the next-to-leading order. Especially the spectral shape of the 39Ar decay can be used to characterize this background component for dark matter searches based on argon. Alternatively, due to the low thresholds of these experiments, the spectral shape can be investigated over a wide energy range with high statistics and thus allow a sensitive comparison with the theoretical predictions, in particular at low electron energies where the shape of the computed β spectrum has a slight dependence on the value of the weak axial-vector coupling constan…

background componentforbidden argon β decayrare-event searchesspectral shapes
researchProduct

Le "vrai portrait" du Grand Comte Roger. De Florence à la Sicile: aux origines d'une équivoque

2006

Partendo da due dipinti pressoché identici del XVII secolo conservati a Patti (ME) e Troina (EN), che raffigurano il ritratto ideale del Gran Conte Ruggero Hauteville, protagonista della liberazione della Sicilia dal dominio islamico, se ne è riconosciuto il modello in un dipinto di Cristofano Allori firmato e datato 1590, oggi agli Uffizi ma proveniente dalla Badia Fiorentina, avente per soggetto il Marchese Ugo di Toscana. Il saggio propone inoltre di riferire le opere siciliane al medesimo pittore e alla comune committenza del vescovo Vincenzo Napoli (+1648). Starting from two almost identical paintings from the 17th century preserved in Patti (ME) and Troina (EN), which depict the ideal…

pitturaSettore L-ART/04 - Museologia E Critica Artistica E Del Restauropeinture mécénat artistique Patti Troina Vincenzo Napoli Cristofano Allori Grand Comte de Sicile Roger Hauteville Marquis Hugues de ToscaneSettore L-ART/01 - Storia Dell'Arte Medievalepittura committenza artistica Patti Troina Vincenzo Napoli Cristofano Allori Gran Conte di Sicilia Ruggero Hauteville Marchese Ugo di Toscanapainting artistic patronage Patti Troina Vincenzo Napoli Cristofano Allori Grand Count of Sicily Roger Hauteville Marquis Hugh of Tuscanycommittenza artisticaSettore L-ART/02 - Storia Dell'Arte Moderna
researchProduct