Search results for "Virtual"

Dispersive evaluation of the D-term form factor in deeply virtual Compton scattering

2014

We present a dispersive representation of the D-term form factor for hard exclusive reactions, using unsubtracted $t$-channel dispersion relations. The $t$-channel unitarity relation is saturated with the contribution of two-pion intermediate states, using the two-pion distributions amplitude for the $\gamma^*\gamma\rightarrow \pi\pi$ subprocess and reconstructing the $\pi\pi\rightarrow N\bar N$ subprocess from available information on pion-nucleon partial-wave helicity amplitudes. Results for the D-term form factor as function of $t$ as well as at $t=0$ are discussed in comparison with available model predictions and phenomenological parametrizations.

Gluon imaging using azimuthal correlations in diffractive scattering at the Electron-Ion Collider

2021

We study coherent diffractive photon and vector meson production in electron-proton and electron-nucleus collisions within the Color Glass Condensate effective field theory. We show that electron-photon and electron-vector meson azimuthal angle correlations are sensitive to non-trivial spatial correlations in the gluon distribution of the target, and perform explicit calculations using spatially dependent McLerran-Venugopalan initial color charge configurations coupled to the numerical solution of small $x$ JIMWLK evolution equations. We compute the cross-section differentially in $Q^2$ and $|t|$ and find sizeable anisotropies in the electron-photon and electron-$\mathrm{J}/��$ azimuthal co…

La Psichiatria e l'Information and Communication Technology (ICT): le risorse e i rischi

2007

An Augmented Reality System for Treating Psychological Disorders: Application to Phobia to Cockroaches

2005

Augmented reality has been used in many fields, but it has not been used to treat psychological disorders. Augmented reality presents several advantages respect to: the traditional treatment of psychological disorders and virtual reality treatments. In this paper we present the first augmented reality system for the treatment of phobia to cockroaches. Our system has been developed using ARToolkit software. It has been tested with one patient and the results have been very satisfactory. At first of the exposure session the patient was not able to approach to a real cockroach and after the exposure session using our augmented reality system, the patient was able to approach to a real cockroac…

Pedagogical Practices for Virtual Worlds

2010

As a result from activities carried out within Module 2 of the MUVEnation programme about exploring active learning approaches, we have created a collection of practices for teaching and learning in Virtual Worlds, organised in 21 chapters, classified in the following categories of instructional methods: Presentation, Demonstration, Discussion, Drill-and-practice, Tutorial, Cooperative Learning, Gaming, Simulation and Discovery. The educational professionals who participated in the course worked in teams, but in some cases individually to map and describe the existing range of teaching practices in Second Life, and to draw a reflection about the elements for their success. Practices describ…

Topošo skolotāju mediju kompetence sabiedrības ilgtspējīgai attīstībai

2015

Izglītībā un sabiedrībā kopumā ir vērojama pretrunīga attieksme par mācību procesa virtualizāciju. Vajadzība konstatēt topošo skolotāju gatavību iekļauties virtualizētā izglītības telpā noteica Raimonda Stroda maģistra darba tematu „Topošo skolotāju mediju kompetence sabiedrības ilgtspējīgai attīstībai”. Analizējot teorētisko literatūru, tika raksturots izglītības virtualizācijas konceptuālais ietvars. Pētījuma empīriskajā daļā, izmantojot jaukto metožu pieeju, tika raksturota topošo skolotāju mediju kompetence un jauno skolotāju mediju kompetences rādītāji, kā arī viedoklis izglītības virtualizācijas kontekstā. Pētījuma rezultāti liecina, ka lielākoties visi topošie skolotāji vēlētos apgūt…

Anthropomorphism and social presence in Human–Virtual service assistant interactions: The role of dialog length and attitudes

2022

In this study, we delve into the perceived quality of recommendations provided by AI-based virtual service assistants (VSAs). Specifically, the role of the social presence of VSAs in influencing recommendation perceptions is investigated. We also explore how the social presence of a VSA is formed and how perceived anthropomorphism plays a vital role in shaping social presence and eventually instilling trust in VSAs among consumers. These relationships are examined in the context of online government services. The results indicate that consumer interaction with VSAs - manifesting via perceived anthropomorphism, social presence, dialog length, and attitudes - improves recommendation quality p…

La ricostruzione da immagini con tecniche di restituzione prospettica

2018

Il contributo è incentrato sulla ricostruzione di opere di architettura perdute da fotografie attraverso l’uso di tecniche di restituzione prospettica. Una breve introduzione illustra le ragioni che relegano la restituzione prospettica a un ruolo secondario nel contesto delle ricostruzioni virtuali; il paragrafo successivo illustra i risultati di un test sul confronto fra restituzione prospettica da singolo fotogramma e restituzione SfM. Il paragrafo conclusivo descrive la ricostruzione virtuale di una chiesa di Palermo, demolita nella prima metà del XX secolo e documentata da poche foto d’epoca. The paper focuses the 3D reconstruction of buildings that were destroyed during the World War I…

Virtual reality exposure for OCD: Is it feasible? [Exposición mediante realidad virtual para el TOC: ¿Es factible?]

2014

Virtual reality exposure therapy (VRET) is receiving increased attention, especially in the fields of anxiety and eating disorders. This study is the first trial examining the utility of VRET from the perspective of OCD patients. Four OCD women assessed the sense of presence, emotional engagement, and reality judgment, and the anxiety and disgust levels they experimented in four scenarios, called the Contaminated Virtual Environment (COVE), in which they had to perform several activities. The COVE scenarios were presented on a Full HD 46” TV connected to a laptop and to a Kinect device. Results indicate that the COVE scenarios generated a good sense of presence. The anxiety and disgust leve…

PERSPECTIVE RESTITUTION FROM VIEW CAMERAS PHOTOS

2022

Abstract. The paper aims at discussing the accuracy of perspective restitution from view camera photos; view cameras are non-standard cameras frequently used in the past century for on field shooting of buildings and urban sites; this is why the reconstruction of lost buildings often deals with photos taken with a view camera. The case study chosen for the proposed experiment is an urban complex built in Palermo in the ‘50s. The site features a very regular layout with surfaces at right angle, that supports the graphic reconstruction of photos’ inner and outer orientation. The site has been surveyed with a laser scanner; the point cloud provided the metric information needed for the evaluat…