Search results for "Raf"
showing 10 items of 11050 documents
Estimating aggregated nutrient fluxes in four Finnish rivers via Gaussian state space models
2013
Reliable estimates of the nutrient fluxes carried by rivers from land-based sources to the sea are needed for efficient abatement of marine eutrophication. Although nutrient concentrations in rivers generally display large temporal variation, sampling and analysis for nutrients, unlike flow measurements, are rarely performed on a daily basis. The infrequent data calls for ways to reliably estimate the nutrient concentrations of the missing days. Here, we use the Gaussian state space models with daily water flow as a predictor variable to predict missing nutrient concentrations for four agriculturally impacted Finnish rivers. Via simulation of Gaussian state space models, we are able to esti…
Mapping soil water content under sparse vegetation and changeable sky conditions: comparison of two thermal inertia approaches
2013
A critical analysis of a thermal inertia approach to map surface soil water content on bare and sparsely vegetated soils by means of remotely sensed data is reported. The study area is an experimental field located in Barrax, Spain. In situ data were acquired within the Barrax 2011 research project. An advanced hyperspectral scanner airborne imager provides images in the visible/near-infrared and thermal infrared bands. Images were acquired both in day and night times by the Instituto Nacional de Técnica Aeroespacial between 12th and 13th of June 2011. The scene covers a corn irrigation pivot surrounded by bare soil, where a set of in situ data have been collected both previously and simult…
Neighbourhood effects and determinants of population changes in Italy: a spatial perspective
2023
Population trends in Italy are strongly spatially differentiated, with some munic- ipalities showing a systematic loss of population, and others showing an equally continuous demographic increase. Here, we focus our attention on the spatial dimension of population change, looking at how different socio-economic and demographic dimensions affect population changes, as well as their spatial effects. After performing a preliminary descriptive analysis of the trends of population growth and decline in Italy over the last 40 years and the relevant demographic components, we used a spatial Durbin model (SDM) to investigate the potential existence of a diffusion process and the determinants of the…
Spatio-temporal Dynamical Analysis of Brain Activity during Mental Fatigue Process
2021
Mental fatigue is a common phenomenon with implicit and multidimensional properties. It brings dynamic changes of functional brain networks. However, the challenging problem of false positives appears when the connectivity is estimated by Electroencephalography (EEG). In this paper, we propose a novel framework based on spatial clustering to explore the sources of mental fatigue and functional activity changes caused by them. To suppress the false positive observations, spatial clustering is implemented in brain networks. The nodes extracted by spatial clustering are registered back to functional magnetic resonance imaging (fMRI) source space to determined the sources of mental fatigue. The…
El nost Milan: il rap dei ‘nuovi italiani', tra riappropriazioni urbane e rivendicazioni identitarie
2019
italianoFin dai suoi esordi, la cultura hip-hop e stata attraversata da una forte connotazione in senso spaziale, che ne ha variamente contraddistinto i diversi elementi. La citta post-industriale, specie lungo i suoi margini e nei suoi interstizi, rappresenta infatti un sito cruciale a partire dal quale la storia ma, soprattutto, la geografia del rap sono andate col tempo costruendosi. Obiettivo di questo articolo e di riflettere criticamente sulla relazione fra rap e spazi urbani in Italia alla luce delle complesse costruzioni culturali, sociali e politiche che la sottendono, con particolare riferimento a due rapper milanesi della cosiddetta generazione dei nuovi italiani, Zanko e Ghali. …
Da Vicolo Corto a Parco della Vittoria. Storie di Urban Community Gardens a Palermo
2017
Il tema dello spazio pubblico è ormai da anni al centro del dibattito non solo disciplinare. La loro realizzazione, ma soprattutto la loro gestione, risulta complessa e spesso bloccata negli ingranaggi burocratici e di competenze che caratterizzano, ormai, la maggior parte delle amministrazioni. Costruire politiche innovative che avviino processi virtuosi mirati alla realizzazione condivisa di spazi pubblici può essere una possibile “cura” a questo male. Le riflessioni qui presentate su questa possibile nuova declinazione del progetto dello spazio pubblico, partendo da una teoria, si sviluppano grazie a un’esperienza concreta cui i due autori hanno preso parte. Nel 2015 il Comune di Palermo…
Spazio pubblico e cittadinanza. Uno sguardo di genere a Palermo
2011
L'architettura dei teatri: semplicità e complessità dello spazio teatrale
2012
Queste note vogliono mettere in relazione la forma architettonica del teatro alla messa in scena, cercando di riflettere su una frattura che esiste tra il mondo dell’architettura e quello delle arti sceniche. Occorre, al fine di creare una partecipazione attiva del pubblico all’azione, interrogare questo spazio duale, ritenuto spesso invalicabile, e rimetterlo in discussione non volendo negare a priori la sua ‘consacrata’ spazialità. Il regista e lo scenografo, lavorando insieme, possono creare varianti al ‘vecchio sistema’ forzando il tradizionale rapporto dell’intera macchina teatrale.
Measuring optical anisotropy in poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) films with added graphene
2015
Abstract Graphene is a 2D nanomaterial having a great potential for applications in electronics and optoelectronics. Composites of graphene with conducting polymers have shown high performance in practical devices and their solution-processability enables low-cost and high-throughput mass manufacturing using printing techniques. Here we measure the effect of incorporation of graphene into poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) to the optical anisotropy, absorbance and conductivity of the film. Uniaxial anisotropy in PEDOT:PSS films has been thought to be caused by the spin-coating process used in fabrication. We have characterized spray- and spin-coated films …
Realization of time-resolved two-vacuum-ultraviolet-photon ionization
2009
International audience; Ultrafast dynamics of excited molecules is studied through time-resolved two-vacuum-ultraviolet (vuv)- photon ionization using a nonlinear volume autocorrelator unit. The two-vuv-photon process is induced by the intense fifth harmonic radiation of a femtosecond Ti:sapphire laser. In a proof-of-principle experiment, ultrafast dynamics of excited ethylene and oxygen molecules are investigated. Molecular decay times are deduced by comparing the experimental data with the results of a numerical model that accounts for the spatial and temporal characteristics of the harmonic field. The present experiments pave a convenient way for time domain investigations in the vuv-xuv s…