1,721,091 research outputs found
Lattice approaches to dilute Fermi gases: Legacy of broken Galilean invariance
No full textIn the dilute limit, the properties of fermionic lattice models with short-range attractive interactions converge to those of a dilute Fermi gas in continuum space. We investigate this connection using mean-field theory, and we show that the existence of finite lattice spacing has consequences down to very small densities. In particular, we show that the reduced translational invariance associated with the lattice periodicity has a pivotal role in the finite-density corrections to the universal zero-density limit. For a parabolic dispersion with a sharp cutoff, we provide an analytical expression for the corrections, and we find that the unavoidable cutoff contributes at leading-order to the corrections to the relevant observables. In a generic lattice we find a universal power-law behavior n(1/3) which leads to significant corrections already for small densities. Our results place strong constraints on lattice extrapolations of dilute Fermi gas properties. RI Capone, Massimo/A-7762-200
“The Regular temporary occlusion in karst acquifers following earthquakes. The case of the Ciane-Aretusa springs-Sicily"
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Personalization in Audio Storytelling within Virtual and Augmented Reality: State of the Art and Insights
No full textPRELIMINARY EVALUATION OF THE AURALIZATION OF A REAL INDOOR ENVIRONMENT FOR AUGMENTED REALITY RESEARCH
No full textOn the Effect of User Tracking on Perceived Source Positions in Mobile Audio Augmented Reality
No full textMobile Audio Augmented Reality (AAR) allows users to live sonic experience where virtual sound objects are integrated seamlessly with the real-world acoustic space. This paper focuses on user perception of the virtual source position and the impact of different out-of-the-box user tracking and head orientation methods made available by iPad's Augmented Reality (AR) camera tracking system and AirPods Pro. We propose an experimental procedure to rank tracking approaches according to perceived accuracy in positioning eye-level and ground-level virtual audio sources compared to real source references. To correctly provide a plausible AAR scenario, the proposed consumer electronic setup simulates a virtual sound source employing the scattering delay network (SDN) algorithm for calibrated dynamic auralisation and customized head-related transfer functions (HRTFs) for personalized user acoustics. The natural listening experience of real sound sources leverages AirPods's active signal processing algorithms for headphone hear-through capabilities. The main result of this study lies in observing an accommodation effect by users interacting with different tracking approaches and sound source positions. In summary, participants tend to prefer more stable tracking solutions despite accuracy and wide head movement range
Virtual Meeting Analyzer: A web application to visualize and analyze social networks emerging in group
No full textThe visualization and analysis of the social networks emerging between meeting participants could improve the communication effectiveness and satisfaction. However, accurate data collection is difficult, as it requires tracking all verbal exchanges with their direction, source and addresse(s). The analysis of this data is usually post hoc, after the meeting ends. Virtual Meeting Analyzer is a web application developed to solve these limits when tracking social network relations in small meetings. By using a simple interface, and a tablet PC pen as input modality, users without any specific skill in Social Network Analysis or informatics can extract indices on the spot. The application is divided into four modules: meeting creation, configuration, recording, and analysis (either during the meeting or afterwards). This paper describes the design of the application and the results of a tests carried out to evaluate its usability
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