1,887 research outputs found
N. 863 - Caratteristiche degli smart contracts
No full textLa Banca d’Italia, l’Università Cattolica di Milano e l’Università degli Studi Roma Tre hanno avviato una ricerca sulle caratteristiche degli smart contracts per l'erogazione di servizi bancari, finanziari e assicurativi. Il presente documento si propone di evidenziare le questioni che gli smart contracts pongono sul piano giuridico e tecnico, con l’obiettivo di elaborare, nel prosieguo, linee guida deducibili dalla migliore prassi. Il documento approfondisce gli smart contracts, intesi nelle due accezioni di: i) smart contract code, ovvero un programma software che viene memorizzato, verificato ed eseguito su una blockchain; ii) smart legal contract, cioè
uno strumento che insiste sulla tecnologia blockchain per articolare, verificare e applicare un accordo tra le parti; si propone altresì un approfondimento sulle caratteristiche delle blockchain
N. 863 - Caratteristiche degli smart contracts
No full textLa Banca d’Italia, l’Università Cattolica di Milano e l’Università degli Studi Roma Tre hanno avviato una ricerca sulle caratteristiche degli smart contracts per l'erogazione di servizi bancari, finanziari e assicurativi. Il presente documento si propone di evidenziare le questioni che gli smart contracts pongono sul piano giuridico e tecnico, con l’obiettivo di elaborare, nel prosieguo, linee guida deducibili dalla migliore prassi. Il documento approfondisce gli smart contracts, intesi nelle due accezioni di: i) smart contract code, ovvero un programma software che viene memorizzato, verificato ed eseguito su una blockchain; ii) smart legal contract, cioè
uno strumento che insiste sulla tecnologia blockchain per articolare, verificare e applicare un accordo tra le parti; si propone altresì un approfondimento sulle caratteristiche delle blockchain
Et in Arcadia Arcadiae? Il paesaggio della Foresta di Arden in As You Like It
No full textThis essay focuses on the Forest of Arden in "As You Like It", highlighting how this landscape is not simply a homogeneous ‘other’ space that allows characters to undergo metamorphoses of various kinds; rather, it also offers references to particular genres and traditions that privilege awareness and change at the expense of the immobility of the Arcadian ideal. Focusing on the religious and romance tradition, this essay attempts to show how the implications of these references are more specific than generally understood: although certain traditions are usually listed among the influences on Shakespeare’s playwriting of this comedy, this paper focuses on the role they play in the text – that is, they contribute to the play’s didactic aims. Also, this essay suggests that such educational approach is probably the only feature of the pastoral seriously maintained in the comedy
Experimental gravitation
No full textFeatures a comprehensive review of experimental gravitation.
Provides an in-depth description of measurement strategies and data analysis.
Serves as a useful resource for graduate and professionals written by leading experimentalists
Precessional effects on the LISA “constellation”
No full textWe investigate with a simple analytical approach some effects on the orbits of LISA due to the corrections of the gravitational potential of the Sun. The general relativistic correction in the weak field limit, responsible for the classical relativistic perihelion advance, can be obtained by adding to the potential a term scaling as r3 and parametrized by the Sun Schwarzschild radius. Another interesting correction term is provided by the intrinsic quadrupole moment of the Sun. With the current values of the parameters, the effects produced by both these terms are probably within the detection capabilities of LISA. With the same approach can also be evaluated the much smaller effect of a global stationary field, associated to sources like the interplanetary dust or a local dark matter component
Dark gravitomagnetism with LISA and gravitational waves space detectors
No full textWe present here the proposal to use the LISA interferometer for detecting the gravito-
magnetic field due to the rotation of the Milky Way, including the contribution given by
the dark matter halo. The galactic signal would be superposed to the gravitomagnetic
field of the Sun. The technique to be used is based on the asymmetric propagation of
light along the closed contour of the space interferometer (Sagnac-like approach). Both
principle and practical aspects of the proposed experiment are discussed. The strategy
for disentangling the sought for signal from the kinematic terms due to proper rotation
and orbital motion is based on the time modulation of the time of flight asymmetry.
Such modulation will be originated by the annual oscillation of the plane of the interfer-
ometer with respect to the galactic plane. Also the effect of the gravitomagnetic field on
the polarization of the electromagnetic signals is presented as an in principle detectable
phenomenon
The Science Case for Advanced Gravitational Wave Detectors
No full textWe provide an introduction to the science case for advanced interferometric gravitational wave detectors, which are currently being realized in the world and in the second half of the present decade will achieve a sensitivity ten times larger than first generation instruments. Starting from the results obtained with first generation instruments, this paper will motivate the experimental effort and will provide an introduction to the science that will be harvested by second generation detectors
Recuerdos de Massimo.
No full textEl presente ensayo recuerda la rica relación personal e intelectual entre Massimo Pavarini e Iñaki Rivera Beiras desde que el segundo conoció siendo muy joven a Pavarini. En ese sentido, el trabajo recuerda los inicios de su fecunda relación en la ciudad de Bologna cuando Iñaki Rivera acudía a presentar a Massimo Pavarini los desarrollos de lo que sería su tesis doctoral. Las contribuciones de Pavarini al proceso de aprendizaje de Rivera, en el terreno de una epistemología crítica en la penología contemporánea, son analizados como un homenaje a la memoria y a la obra del autor italiano, tras su fallecimiento en septiembre de 2015.This paper recalls the rich personal and intellectual relationship between Massimo Pavarini and Iñaki Rivera Beiras. In that sense , the work recalls the beginning of his fruitful relationship in the city of Bologna when Iñaki Rivera came to present Massimo Pavarini’ developments in what would be his PhD thesis. Pavarini contributions to the learning process of Rivera, on the ground of a critical epistemology in contemporary penology , are analyzed as a tribute to the memory and to the work of Italian author, after his death in September 2015 .El presente ensayo recuerda la rica relación personal e intelectual entre Massimo Pavarini e Iñaki Rivera Beiras desde que el segundo conoció siendo muy joven a Pavarini. En ese sentido, el trabajo recuerda los inicios de su fecunda relación en la ciudad de Bologna cuando Iñaki Rivera acudía a presentar a Massimo Pavarini los desarrollos de lo que sería su tesis doctoral. Las contribuciones de Pavarini al proceso de aprendizaje de Rivera, en el terreno de una epistemología crítica en la penología contemporánea, son analizados como un homenaje a la memoria y a la obra del autor italiano, tras su fallecimiento en septiembre de 2015
Autonomous perturbations of LISA orbits
No full textWe investigate autonomous perturbations on the orbits of LISA, namely the effects produced by gravitational fields that can be expressed only in terms of the position, but not of time in the Hill frame. This first step in the study of the LISA orbits has been the subject of recent papers which implement analytical techniques based on a ‘post-epicyclic’ approximation in the Hill frame to find optimal unperturbed orbits. The natural step forward is to analyze the perturbations to purely Keplerian orbits. In this work, a particular emphasis is put on the tidal field of the Earth assumed to be stationary in the Hill frame. Other relevant classes of autonomous perturbations are those given by the corrections to the solar field responsible for a slow precession and a global stationary field, associated with sources such as the interplanetary dust or a local dark matter component. The inclusion of simple linear contributions in the expansion of these fields produces secular solutions that can be compared with the measurements and possibly used to evaluate some morphological property of the perturbing components
The SaToR-G experiment: testing metric and non-metric theories of gravity in the Earth’s field via laser tracking to geodetic satellites
No full textSatellite Tests of Relativistic Gravity (SaToR-G) is a new experiment in fundamental physics of the National
Scientific Committee 2 (CSN2) of the Italian National Institute for Nuclear Physics (INFN).
The experiment aims at testing gravitation beyond the predictions of Einstein’s Theory of General Relativity
in its weak-field and slow-motion limit, searching for effects foreseen by alternative theories of gravitation
and possibly connected with ‘’new physics’’. The predictions of General Relativity on the orbits of geodetic
satellites, which play the role of test masses, will be compared with those of alternative theories of gravity
both metric and non-metric in their essence. This will allow to test, in addition to other aspects of gravita tion, the field equation of gravity. The natural theoretical framework to test gravitation will be that of the Parameterized Post-Newtonian (PPN) formalism. However, we will also try to apply, as far as possible, the approach suggested by R. H. Dicke more than 50 years ago, usually referred to as the Dicke framework. This is a fairly general framework that allows us to conceive experiments not connected, a priori, with a given physical theory and also provides a way to analyze the results of an experiment under primary hypotheses.
The activities of the experiment related to the development of perturbative models to better determine the dynamics of the orbits of the considered satellites will be presented together with preliminary results on possible
new constraints to alternative theories of gravitation
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