Search results for "sperimentale"
showing 10 items of 938 documents
Measurement of the inelastic proton-proton cross-section at √s = 7 TeV with the ATLAS detector
2011
The dependence of the rate of proton–proton interactions on the centre-of-mass collision energy, √s, is of fundamental importance for both hadron collider physics and particle astrophysics. The dependence cannot yet be calculated from first principles; therefore, experimental measurements are needed. Here we present the first measurement of the inelastic proton–proton interaction cross-section at a centre-of-mass energy, √s, of 7 TeV using the ATLAS detector at the Large Hadron Collider. Events are selected by requiring hits on scintillation counters mounted in the forward region of the detector. An inelastic cross-section of 60.3±2.1 mb is measured for ξ>5×10[superscript −6], where ξ is ca…
An experimental investigation on the poor hydrogen sorption properties of nano-structured LaNi5 prepared by ball-milling
2011
Abstract Nano-structured LaNi5 hydrogen storage materials prepared by ball-milling is analysed using differential scanning calorimetry (DSC) and x-ray photoelectron spectroscopy (XPS). DSC results indicate a partial elimination of defects at 500 °C in a more efficient way for the short-time ball-milled powders compared to the long-time ball-milled ones. XPS results show almost no change in the core-level electronic structure for La and Ni of LaNi5 in the bulk and the nano-structured forms, but gives an indication that the self-restoring mechanism of the active surface observed in the bulk sample (Siegmann et al. Phys. Rev. Lett. 40, 972) may not be occurring in the nano-powders. Results fro…
Diffusion process of molecular oxygen in silica nanoparticles
2012
Il dialogo tra Capability Approach e la form-azione delle competenze digitali
2020
Il presente contributo si focalizza su una sfida educativa impellente della contemporaneità: la form-azione della cittadinanza digitale. A partire dal Quadro di riferimento Europeo per le competenze digitali dei cittadini, viene svolta una riflessione basata sull’interconnessione tra il Capability approach e le competenze digitali. Il Capability Approach, sviluppando un orizzonte di senso eticoeconomico-politico basato su: “functioning”, capability” e “agency”, completa e orienta il framework teorico-metodologico dettato dai riferimenti normativi europei sullo sviluppo delle digital skills. L’indagine sulle digital skills può essere un’opportunità per orientare l’azione formativa, in riferi…
Performance of a new real time digital pulse processing system for X-ray and gamma ray semiconductor detectors
2014
New generation spectroscopy systems have advanced towards digital pulse processing (DPP) approaches. DPP systems, based on direct digitizing and processing of detector signals, have recently been favoured over analog pulse processing electronics, ensuring better performance. In this work, we present the performance of a new real time DPP system for X-ray and gamma ray semiconductor detectors. The system is based on a commercial digitizer equipped with a custom DPP firmware, developed by our group, for on-line pulse shape and height analysis. X-ray and gamma ray spectra measurements with cadmium telluride (CdTe) and germanium (Ge) detectors, coupled to resistive feedback preamplifiers, will …
La competenza digitale all’università per la progettazione di percorsi di Media Education Digital literacy at university to design Media Education
2015
La crescente digitalizzazione e globalizzazione dei media, l’ampia diversificazione dell’offerta mediale, con i problemi valoriali ed etici che essa pone, ripresentano e confermano le ragioni che fanno dell’educazione ai media un compito imprescindibile di chi si occupa di educazione. Con interventi educativi specifici e fornendo loro adeguati strumenti di valutazione e di autovalutazione, i futuri educatori vanno aiutati ad acquisire le adeguate competenze digitali necessarie per l’acquisizione della capacità di scelta autonoma e responsabile dei media che permetta loro di progettare percorsi di media education in ambito educativo. La competenza mediale sollecita la capacità di insegnanti …
Digital Techniques for High-Rate High-Resolution Radiation Measurements
2014
Digital pulse processing (DPP) techniques are increasingly used in the development of modern spectroscopic systems. DPP systems, based on direct digitizing and processing of detector signals (preamplifier output signals), ensure higher flexibility, stability, lower dead time, higher throughput and better energy resolution than traditional pulse processing systems. In this work, we present our progress in the development of DPP systems for high-rate high-resolution radiation measurements. An innovative digital system, able to perform multi-parameter analysis (input counting rate, pulse height, pulse shape, event arrival time, etc.) even at high photon counting rates is presented. Experimenta…
Digital skills e consapevolezza metacognitiva: prospettive di sviluppo professionale dei docenti universitari neoassunti
2021
La spinta all’innovazione verso ambienti di apprendimento caratterizzati da un uso intensivo della tecnologia, determinata dalla crisi pandemica, costituisce una questione strategica per lo sviluppo dell’alta formazione. In questa direzione, la formazione e professionalizzazione del docente universitario sul versante pedagogico-didattico-valutativo rappresenta un’azione rilevante con potenziale impatto sul sistema universitario nel suo complesso. Il focus specifico del presente contributo riguarda il ruolo della competenza metacognitiva del docente con particolare attenzione all’utilizzo delle tecnologie, delle strategie didattiche evidence-informed e di modalità innovative di valutazione. …
Divari territoriali nelle diseguaglianze di genere in Italia
2009
Indagini teoriche e sperimentali su dissipatori ad attrito per edifici in acciaio in zona sismica
2017
The present paper presents the results of experimental analyses carried out to study the behaviour of slotted bolted connections (SBC) as friction steel dampers. The devices consist of bolted joints with slotted holes, which can be used in both steel and RC framed structures or, alternatively, into beam-column and column-foundation joints. The most suitable configurations to increase friction are investigated utilizing steel S355J0 plates and class 10.9HV high-strength bolts, under controlled pre-load and considering different types of surface treatment. Experimental tests are carried out making use of a universal testing machine, which allows mak-ing displacement-controlled tests. Once the…