Search results for "rfa"

Search for photons with energies above 1018 eV using the hybrid detector of the Pierre Auger Observatory

2017

A search for ultra-high energy photons with energies above 1 EeV is performed using nine years of data collected by the Pierre Auger Observatory in hybrid operation mode. An unprecedented separation power between photon and hadron primaries is achieved by combining measurements of the longitudinal air-shower development with the particle content at ground measured by the fluorescence and surface detectors, respectively. Only three photon candidates at energies 1-2 EeV are found, which is compatible with the expected hadron-induced background. Upper limits on the integral flux of ultra-high energy photons of 0.027, 0.009, 0.008, 0.008 and 0.007 km-2 sr-1 yr-1 are derived at 95% C.L. for ener…

Ultra-High Energy Neutrinos at the Pierre Auger Observatory

2013

The observation of ultrahigh energy neutrinos (UHE nu s) has become a priority in experimental astroparticle physics. UHE nu s can be detected with a variety of techniques. In particular, neutrinos can interact in the atmosphere (downward-going nu) or in the Earth crust (Earth-skimming nu), producing air showers that can be observed with arrays of detectors at the ground. With the surface detector array of the Pierre Auger Observatory we can detect these types of cascades. The distinguishing signature for neutrino events is the presence of very inclined showers produced close to the ground (i.e., after having traversed a large amount of atmosphere). In this work we review the procedure and …

Hydro-mechanical modelling of a natural slope affected by a multiple slip surface failure mechanism

2009

A coupled hydro-mechanical formulation is presented for the analysis of landslide motion during crisis episodes. The mathematical formulation is used to model a natural slope affected by a multiple slip surface failure mechanism, in which pore water pressure evolution was identified as the main cause for movement accelerations. An elasto-plastic constitutive model is adopted for the behaviour of slip surfaces. Material parameters are obtained by combining the available laboratory tests and the back analysis of some crisis episodes. After being calibrated and validated, the model is applied to improve the understanding of the physical processes involved and to predict the landslide behaviour…

Urban Flood Prediction through GIS-Based Dual-Coupled Hydraulic Models

2022

Propagation of pluvial floods in urban areas, occurring with return time periods of few years, can be well solved using dual models accounting for the mutual relationship between the water level in the streets and the discharges inside the sewer pipes. The extended WEC-flood model (EWEC), based on the use of unstructured triangular meshes and a diffusive formulation of the momentum equations in both the 2D and the 1D lower domains, is presented along with its novelty, limits, and advantages. The model is then applied to a small computational domain in the Palermo area, where only some ‘hard’ data given by one rain gauge has been used for calibration and validation, along with ot…

“Palermo liquida. Il progetto per il waterfront come occasione di rigenerazione della città”

2011

Il progetto di riqualificazione del Waterfront di Palermo è parte di una politica nazionale più ampia: il PIAU “Porti e Stazioni”, finanziato dal Ministero delle Infrastrutture, con la collaborazione attiva del Comune, dell'Autorità Portuale e delle Ferrovie. Il nuovo “Piano regolatore portuale” (PRP), oltre ad affrontare le questioni più generali delle funzioni portuali, propone strategie per affrontare la questione della “ aree di interazione città-porto” e le "aree di interfaccia", immaginate per accogliere nuove funzioni residenziali, commerciali, culturali e ricreative. Il paper attraverso la descrizione del progetto per il waterfront di Palermo e il processo di redazione del nuovo PRP…

Calf muscle activation strategies in healthy and injured achilles tendon conditions

2015

Artikkeliväitöskirja. Sisältää yhteenveto-osan ja neljä artikkelia. Article dissertation. Contains an introduction part and four articles.

Interactive television usability : Case: TELE Omavisio

1998

Lietotāju uztveres uzlabojumi saskarnēs atkarībā no to elementu izkārtojuma

2022

Maģistra darba tēma “Lietotāju uztveres uzlabojumi saskarnēs atkarībā no to elementu izkārtojuma”. 2022. gadā, pēc statistikas datiem, saskarnes var palielināt tīmekļvietnes reklāmieguvuma līmeni par 200%, bet saskarnes dizains līdz pat 400% [71], tādējādi lietotāju saskarnes uztvere ir svarīga pētījuma tēma. Maģistra darba mērķis ir izpētīt un izanalizēt, kurās saskarnēs elementu izkārtojums uzlabo lietotāju uztveri. Pētījuma rezultātā tika noskaidrots, ka lietotājam visvieglāk informāciju ir uztvert saskarnē Nr.1, savukārt visgrūtāk lietotājam informāciju uztvert ir saskarnē Nr.6, atkarībā no elementu izvietojuma, dizaina un skaita. Maģistra darbā izklāstīts 63 lappusēs, iekļauti 20 attēl…

Human conceptualisation processes as a perspective on the design and evaluation of user-interfaces

2013

Interaction between surface plasmon polaritons and molecules in strong coupling limit

2016

Miniaturization of optical elements and their integration to electronic circuits is limited by diffraction limit. It was realized that light being coupled to surface plasmons (SP) can overcome this limit. Employing also optically active molecules in combination with SPs can drive optical circuits to nm-scale and add functionalities. For efficient performance of plasmonic elements involving fluorescent dye molecules investigation of physics behind their interaction is of high priority. In this thesis interaction between surface plasmon polaritons (SPPs) and different dye molecules has been studied, especially within strong coupling limit, which brings in totally new physical properties in th…