Search results for "sperimentale"
showing 10 items of 938 documents
Analisi fluidodinamica e sperimentale su una turbina Cross-Flow
2014
L'energia idroelettrica è una forma di energia rinnovabile che oggi sta subendo un profondo processo di trasformazione passando da un sistema centralizzato di produzione ad un sistema di tipo distribuito. Tale processo ha dato un forte impulso alla costruzione di impianti di produzione idroelettrici su piccola scala. Questi impianti si possono realizzare: 1) lungo piccoli corsi d'acqua con piccoli salti disponibili, 2) alla fine di lunghe condotte di adduzione in corrispondenza della sezione di consegna ad un serbatoio cittadino, 3) nelle reti di distribuzione idriche dove il carico piezometrico in eccesso si dissipa con valvole di regolazione, 4) a valle di impianti di depurazione nel caso…
Diffusion coefficient of PVA Fricke gel dosimeters
2015
Fricke gel dosimeters based on various matrix has been studied for a long time as 3D dosimetric system for radiotherapy. Selfoxidation and loss of spatial resolution due to diffusion have been the main issues that have impaired the affirmation of this technique so far. As part of an Italian nation-wide research program, we were interested in develop new gel formulations that are simple, reproducible and non toxic. We studied the one dimensional diffusion coefficient of Fe3+ ions inside Fricke gel dosimeters based on a matrix of PVA cross-linked with a di-aldehyde. With a spectrophotometer equipped with a moving tray we were able to collect absorbance measurements at different positions of t…
Measurement of dijet production with a veto on additional central jet activity in pp collisions at sqrt(s)=7 TeV using the ATLAS detector
2011
A measurement of jet activity in the rapidity interval bounded by a dijet system is presented. Events are vetoed if a jet with transverse momentum greater than 20 GeV is found between the two boundary jets. The fraction of dijet events that survive the jet veto is presented for boundary jets that are separated by up to six units of rapidity and with mean transverse momentum 50 < p¯T < 500 GeV. The mean multiplicity of jets above the veto scale in the rapidity interval bounded by the dijet system is also presented as an alternative method for quantifying perturbative QCD emission. The data are compared to a next-to-leading order plus parton shower prediction from the powheg-box, an all-order…
Advanced techniques in Magnetic Resonance Imaging: characterization of non-gaussian water diffusion using DIFFUSION KURTOSIS IMAGING (DKI)
2014
Observations of Forbush Decreases of cosmic ray electrons and positrons with the Dark Matter Particle Explorer
2021
The Forbush Decrease (FD) represents the rapid decrease of the intensities of charged particles accompanied with the coronal mass ejections (CMEs) or high-speed streams from coronal holes. It has been mainly explored with ground-based neutron monitors network which indirectly measure the integrated intensities of all species of cosmic rays by counting secondary neutrons produced from interaction between atmosphere atoms and cosmic rays. The space-based experiments can resolve the species of particles but the energy ranges are limited by the relative small acceptances except for the most abundant particles like protons and helium. Therefore, the FD of cosmic ray electrons and positrons have …
Limit on the production of a light vector gauge boson in $\phi $ mesondecays with the KLOE detector
2012
We present a new limit on the production of a light dark-force mediator with the KLOE detector at DAPHNE. This boson, called U, has been searched for in the decay phi --> eta U, U --> e+ e-, analyzing the decay eta --> pi0 pi0 pi0 in a data sample of 1.7 fb-1. No structures are observed in the e+e- invariant mass distribution over the background. This search is combined with a previous result obtained from the decay eta --> pi+ pi- pi0, increasing the sensitivity. We set an upper limit at 90% C.L. on the ratio between the U boson coupling constant and the fine structure constant of alpha'/alpha < 1.7x10^-5 for 30<M_U<400 MeV and alpha'/alpha < 8x10^-6 for the sub-region 50<M_U<210 MeV. This…
Decision making as a moment of inclusion for students in internship
2018
The vocational training issue today is relevant in the social and political debate to improve the quality of the school system, and to the discussion about the professionalization of education pathways. The new reform law 107/15 art. 1 introduces and regulates the obligation of young apprenticeship program, to be carried out for all students in the last three years of secondary school. The law, which takes over the Legislative Decree 15/4/2005, n. 77 of the application 28/03/2003, n. 53 in which such innovations had been introduced, makes the process compulsory for every student of the secondary school in last three years. The paper presents an exploratory qualitative study design focusing …
Buone pratiche organizzative e didattiche in tempo di COVID-19
2021
Le scuole paritarie cattoliche o cristianamente ispirate, tra marzo 2020 e febbraio 2021, hanno riorganizzato l’attività didattica in forme tali da prevenire i contagi da Covid-19. .E’ stata avvertita da tutti la mancanza delle relazioni interpersonali in presenza. Complessivamente la sfida della didattica a distanza ha sollecitato la creatività educativa degli insegnanti e dei dirigenti scolastici. Sono presentate 9 buone pratiche di dirigenza scolastica durante la pandemia e 17 buone pratiche didattiche, distribuite fra tutti i livelli scolastici. Le famiglie sono state contente di come i propri figli sono stati seguiti dalla scuola durante la fase dell’insegnamento svolto obbligatoriamen…