1,721,064 research outputs found
Scenarios of technological progress in Italy. What can we expect?
Full text linkThe simple but deep sense of technological progress (TP) lies in
the possibility of improving human life. The immediate question
thereafter is clearly about the distribution of the gains from TP.
With the diffusion of automation and artificial intelligence, fears
about the implications of TP on employment and wages have
gained renewed importance. While scholars are divided on the
effects of this new wave of TP, they agree that every economy
will be affected differently, and hence, it will require tailored
policy measures. In this paper, we frame how TP could affect
the Italian economy, as it is now. We simulate four different
scenarios through a dynamic computable general equilibrium
model with three types of labour and six types of households.
We calibrate the model on the social accounting matrix, and we
find that TP returns higher growth patterns albeit with disruptive
effects on labour
Analysis of a quantum imaging system based on SPAD detection
No full textThe ability to generate and handle quantum correlations in twin-beam states is the foundation to overcome the imaging limitations imposed by classical light [1], relying on efficient detectors able to select temporal correlations among photons with maximized signal-to-noise ratio. Indeed, quantum information is contained in the interaction with the sample of just two photons, thus losing even one of them or mixing them up with background can completely compromise the experiment. To this end, assessing and evaluating the expected probability of measurement errors is of utmost importance to optimize the detector design. A typical experimental setup of a quantum imaging system based on Spontaneous Parametric Down Conversion (SPDC), the most effective way of producing temporally and spatially correlated entangled photons [2], involves a pump laser hitting a non-linear birefringent crystal producing a down-converted signal, some passive optical components to generate polarization-entangled photons and a pixelated photon detector that eventually reveals the position of coincident entangled photons. The overall detection efficiency of the measurement setup (i.e. heralding efficiency ηH) gathers all its possible losses and non-idealities of the mentioned setup components, namely the crystal conversion efficiency, the optical losses, the detector Photon Detection Efficiency (PDE) and fill-factor. In this study, we consider a detection based on a Single Photon Avalanche Diode (SPAD) array, able to detect coincidences on-chip and with event-driven architecture, which provides fast readout, low power consumption and optimized data throughput. However, related to every on-chip coincidence detection and event-driven based architecture, some operations require a certain amount of time to be performed that, combined with the generation of undesired single photons (both due to limited heralding efficiency and SPAD Dark Count Rate, DCR), yield to three measurement errors, here described with their related probabilities. Firstly, due to the finite duration of the coincidence window tCOINC, there exist a probability Pfalse of wrongly detecting as coincident photons two single photons, and can be expressed as:egin{equation*}{P{false}} = {{left[ {2{mu {SOURCE{ ext{ }}}}{eta H}left( {1 - {eta H}}
ight) + { ext{DCR}}}
ight]left( {1 - {ě{ - left[ {2{mu {SOURCE}}{eta H}left( {1 - {eta H}}
ight) + { ext{DCR}}}
ight]Delta {t{COINC}}}}}
ight)}}{{{mu {SOURCE}}eta Hˇ2 + left[ {2{mu {SOURCE}}{eta H}left( {1 - {eta H}}
ight) + DCR}
ight]left( {1 - {ě{ - left[ {2{mu {SOURCE}}{eta H}left( {1 - {eta H}}
ight) + { ext{DCR}}}
ight]Delta {t{COINC}}}}}
ight)}} ag{1}end{equation*}whereSOURCE is the number of photon pairs generated by an ideal non-linear crystal. Secondly, in the time needed for the array to freeze the pixels state after a coincidence event (tFREEZE) so that they can be readout, there is the probability Pspurious of detecting a third spurious event after a coincidence has been detected, which is expressed as:egin{equation*}{P{spurious}} = 1 - {ě{ - left[ {2{mu {SOURCEeta }}Hleft( {1 - {eta H}}
ight) + DCR}
ight]Delta {t{FREEZE}}}} ag{2}end{equation*
Standard di spesa e di entrata nella Legge Delega sul Federalismo Fiscale. Un’analisi con un modello CGE
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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