145 research outputs found
Multi-view data capture for dynamic object reconstruction using handheld augmented reality mobiles
We propose a system to capture nearly-synchronous frame streams from multiple
and moving handheld mobiles that is suitable for dynamic object 3D
reconstruction. Each mobile executes Simultaneous Localisation and Mapping
on-board to estimate its pose, and uses a wireless communication channel to
send or receive synchronisation triggers. Our system can harvest frames and
mobile poses in real time using a decentralised triggering strategy and a
data-relay architecture that can be deployed either at the Edge or in the
Cloud. We show the effectiveness of our system by employing it for 3D skeleton
and volumetric reconstructions. Our triggering strategy achieves equal
performance to that of an NTP-based synchronisation approach, but offers higher
flexibility, as it can be adjusted online based on application needs. We
created a challenging new dataset, namely 4DM, that involves six handheld
augmented reality mobiles recording an actor performing sports actions
outdoors. We validate our system on 4DM, analyse its strengths and limitations,
and compare its modules with alternative ones.Comment: Accepted in Journal of Real-Time Image Processin
The Effect of Interactions on the Conductance of Graphene Nanoribbons
We study the effects of the interaction between electrons and holes on the
conductance G of quasi-one-dimensional graphene systems.
We first consider as a benchmark the limit in which all interactions are
negligible, recovering the predictions of the tight-binding approximation for
the spectrum of the system, and the well-known result G=4 e^2/h for the lowest
conductance quantum. Then we consider an exactly solvable field theoretical
model in which the electro-magnetic interactions are effectively local.
Finally, we use the effective field theory formalism to develop an exactly
solvable model in which we also include the effect of non-local interactions.
We find that such interactions turn the nominally metallic armchair graphene
nanoribbon into a semi-conductor, while the short-range interactions lead to a
correction to the G=4 e^2/h formula.Comment: 9 pages, 1 figur
Città della Conciliazione, Grugliasco, Torino, Italy, 2005-2009
Pubblicazione del progetto Città Universitaria della Conciliazione a Grugliasco (TO) nel numero della rivista World Architecture dedicato ai progetti della Città di Torino
Città Universitaria della Conciliazione a Grugliasco (TO)
Pubblicazione e testo critico del progetto della Città Universitaria della Conciliazione contenuto nell'articolo di Davide Tommaso Ferrando," A welcoming space. Sustainability as conciliation between work and family life" nel numero della rivista World Architecture dedicato ai progetti della Città di Torino
Città Universitaria della Conciliazione a Grugliasco
Pubblicazione e commento critico del progetto della Città Universitaria della Conciliazione contenuto nell'editoriale di Zhang Li (vice-direttore) "Soft sustainability: the Torino approach" del numero della rivista World Architecture dedicato alla Città di Torino
On the thermodynamic path enabling a room-temperature, laser-assisted graphite to nanodiamond transformation
Nanodiamonds are the subject of active research for their potential applications in nano-magnetometry, quantum optics, bioimaging and water cleaning processes. Here, we present a novel thermodynamic model that describes a graphite-liquid-diamond route for the synthesis of nanodiamonds. Its robustness is proved via the production of nanodiamonds powders at room-temperature and standard atmospheric pressure by pulsed laser ablation of pyrolytic graphite in water. The aqueous environment provides a confinement mechanism that promotes diamond nucleation and growth, and a biologically compatible medium for suspension of nanodiamonds. Moreover, we introduce a facile physico-chemical method that does not require harsh chemical or temperature conditions to remove the graphitic byproducts of the laser ablation process. A full characterization of the nanodiamonds by electron and Raman spectroscopies is reported. Our model is also corroborated by comparison with experimental data from the literature
The short term debt vs. long term debt puzzle: a model for the optimal mix
This paper argues that the existing finance literature is inadequate with respect to its coverage of capital structure of small and medium sized enterprises (SMEs). In particular it is argued that the cost of equity (being both conceptually ill defined and empirically non quantifiable) is not applicable to the capital structure decisions for a large proportion of SMEs and the optimal capital structure depends only on the mix of short and long term debt. The paper then presents a model, developed by practitioners for optimising the debt mix and demonstrates its practical application using an Italian firm's debt structure as a case study
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