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Neutrons for studies of radiation hardness
No full textThis paper discusses the neutron irradiations for radiation hardness assurance tests by focusing on high-energy physics applications. Neutron sources commonly used for the testing of electronic components and materials are spallation neutron sources and nuclear reactors. The production of neutrons with two-body reactions is a viable alternative to standard sources as it allows different configurations of neutron spectra among which mono-energetic neutrons, of particular interest for the study of the neutron damage as a function of the energ
Search for electroweak production of charginos and sleptons decaying into final states with two leptons and missing transverse momentum in √s = 13 TeV pp collisions using the ATLAS detector
No full textA search for the electroweak production of charginos and sleptons decaying into final states with two electrons or muons is presented. The analysis is based on 139 fb−1 of proton-proton collision data recorded by the ATLAS experiment at the Large Hadron Collider (LHC) at √s = 13 TeV. Three scenarios are considered: the production of chargino pairs with decays via either W bosons or sleptons and the direct production of slepton pairs. No significant deviations from the Standard Model expectations are observed and limits at 95% confidence level (CL) are set on the masses of relevant supersymmetric particles in each of these scenarios
Memoria fotografica. Storia di un recupero collettivo
Get PDFIl presente volume contiene i contributi delle relazioni presentate nel Workshop tecnico–
scientifico dal titolo “Contributi per la definizione di una metodologia di recupero di materiale
fotografico” all’interno dell’evento “MEMORIA FOTOGRAFICA” svoltosi presso la Biblioteca Labronica
Bottini dell’Olio di Livorno sabato 11 maggio 2019.
Il progetto “Memoria fotografica”, cui la Regione Toscana ha partecipato sia come partner sia
come cofinanziatore, si è posto come obiettivo primario la definizione di una metodologia per il
recupero, la stabilizzazione e il restauro del materiale fotografico contemporaneo danneggiato da
evento naturale, nel caso specifico da alluvione. Per questo studio è stato individuato l’archivio
Dainelli, che è stato gravemente compromesso dall’alluvione che ha colpito il territorio di Livorno nel
settembre 2017. Questo raccoglie un consistente corpus di opere, testimonianze e materiali
documentativi appartenenti al fotografo contemporaneo, di fama internazionale, Daniele Dainelli.
L’archivio - un pezzo di patrimonio rappresentativo della produzione artistica e culturale
contemporanea - comprende classi diverse di materiale fotografico (negativi colore, diapositive colore,
stampe a sviluppo cromogeno e inkjet). Nonostante il primo intervento di urgenza eseguito sul corpus
dell’archivio nei giorni successivi all’inondazione, il materiale si trovava, e versa ancora oggi, in uno
stato di conservazione molto critico che, in assenza di un intervento mirato, può comprometterne
definitivamente la fruibilità. È stato quindi essenziale approntare un piano strutturato per il recupero
e la restituzione della leggibilità di una selezionata parte del materiale per la sua conservazione a
lungo termine, sia al fine di garantirne nuovamente la fruibilità sia per prevenirne l’avanzare di
processi di degrado ormai innescati dall’esposizione alle condizioni estreme dell’alluvionamento
Branching ratios and form factors in B0 s → D(∗)− s μ+νν decays
No full textAs a necessary step towards the test of lepton flavor universality provided by the observable R(D(∗) s ) = B(B0 s → D(∗)− s τ +ντ )/B(B0 s → D(∗)− s μ+νμ), the exlusive branching ratios and form factor of its denominator are going to be measured for the first time at an hadron collider
Supernova neutrino detection in XENONnT neutron and muon Vetoes
No full textThe current phase of the XENON Dark Matter Project, named
XENONnT, will be operative in 2020 in the underground Laboratori Nazionali del Gran Sasso (LNGS). It is a multi-ton detector for direct search of Dark Matter, consisting of a double phase liquid-gas xenon Time Projection Chamber (TPC) which contains 5.9 tons of liquid xenon target mass, inserted in a cryostat surrounded by a tank containing 700 tons of water doped with Gd sulphate. Its aim, as that of its precursor XENON1T, is to detect elastic scattering of Weakly Interacting Massive Particles (WIMPs) off xenon nuclei. The presence of two Veto sub-systems, the muon Veto instrumented with 84 photomultiplier tubes (PMTs) and the neutron Veto with other 120 PMTs, allows to reduce the background for WIMPs search through muon and neutron tagging, while the presence of Gd sulphate increases
the neutron capture cross section. Thanks to the large xenon target used and the presence of the two Vetoes, XENONnT will be able also to detect all flavours of
Supernova neutrinos. Here the results from Monte Carlo simulations of XENONnT detection efficiency are presented for Supernova neutrinos through their inverse beta decay interactions in water of the two Veto sub-systems
Proton NMR relaxation times allow to study molecular correlations within water/methanol solutions
No full textThe dynamic behavior of water/methanol solutions has been studied by means of NMR spectroscopy as a function of concentration and temperature, including the supercooling regime. In particular, the thermal evolution of the longitudinal or spin-lattice and of the transverse or spin-spin relaxation times, T1 and T2, respectively, has been investigated at three methanol molar fractions. In such a way, the reciprocal influences of hydrophobic effects on the water properties as well as that of the hydrophilicity on the solute (through hydrogen bond interactions) have been pointed out by means of a single characteristic correlation time τc. This is interesting taking into account that this correlation time reflects all local structural configurations and characterizes the corresponding dynamics. One of the main result of this NMR investigation shows how the different molecular correlations are energetically favored by temperature variations
Architecture and Sport. History and Contemporaneity
No full textThe first Olympic Games originated in 776 b.C. in the city of Olympia in Greece. The games were of religious significance and were held in honor of Zeus. During the games, wars were suspended and peace was governed. In 393 the emperor Theodosius ended the games considered as pagan rites. However, the games did not die but continued in England, France and Germany as a sports festival. Only in 1894 the Baron Pierre de Coubertin, during a conference at the University of the Sorbonne in Paris, began the modern era of the Olympics. With the modern era the Olympic Games have also taken on several interesting configurations: Winter Games, Paralympic Games, Games for young people. The Sport, in addition to the role of entertainment and competition, has taken on a very important significance in the life of the communities and today is the protagonist of urban regeneration and territories.
In the last century we have witnessed many projects where the sport has helped to reflect on the cities of the future.
The Volume 7, No. 1, 2019 of EdA intends to analyze the relationship between Architecture and Sport through contributions of historical research, reflection and operational proposals with interesting implications for the communities
Il viaggio nel mondo del nuovo coronavirus
No full textUna lezione di scienza che affronta l’emergenza sanitaria causata dal nuovo coronavirus, in modo semplice e leggero e soprattutto adatta alle giovanissime generazioni. L’argomento è trattato mediante un video scientifico divulgativo che ha come protagonisti: una ricercatrice e un pupazzo dal nome curioso “Viruloso”, i quali dibattono in maniera leggera e divertente, senza mai allontanarsi dalla reale condizione, sul ruolo e le ricadute sulla popolazione che questo virus sta causando. L’idea nasce dall’esigenza di informare il piccolo pubblico sull’attuale situazione che il mondo vive superando la problematica del linguaggio complesso e tecnico usato dai mass media e web. Da qui l’idea di far parlare direttamente il nuovo coronavirus. Tra i contenuti, gli autori fanno riferimento all’importanza delle semplici regole comportamentali e buone pratiche da adottare per ridurre i contagi, senza dimenticare la risposta dell’ambiente
Acalculous Acute Pancreatitis in a COVID-19 Patient
Get PDFCoronavirus disease 2019 (COVID-19) is a multisystemic condition caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) with manifestations ranging from mild upper respiratory symptoms to cytokine storm causing acute respiratory distress syndrome. Pancreatic exocrine tissue and endocrine islets both express angiotensin-converting enzyme 2 (ACE2), the proven receptor for SARS-CoV-2 cell internalization. An increase in pancreatic enzymes has been increasingly recognized in patients with COVID-19, but little is known about the real prevalence of acute pancreatitis in this population. We report a case of acute acalculous pancreatitis in a COVID-19 patient