Phenomenological Analysis of the Decay $B^{\pm}\to K^{\pm} p {\bar p}

We propose a parametrization for intepreting some of the presently available data of the $B^{\pm} \to K^{\pm} p {\bar p}$ decay, in particular those by LHCb and Belle collaborations. The model is inspired by the well-known current and transition contributions, usually assumed in this kind of decay. However, in the light of considerations about the dominant graphs and about final state interactions, we modify some parameters of the model, determining them by means of a best fit to data. We show the results, which we discuss in some detail. Moreover we give some predictions on other observables relative to the decays.Comment: 19 pages, 5 figures in EPJC 201

An Analytical Solution for Probabilistic Guarantees of Reservation Based Soft Real-Time Systems

We show a methodology for the computation of the probability of deadline miss for a periodic real-time task scheduled by a resource reservation algorithm. We propose a modelling technique for the system that reduces the computation of such a probability to that of the steady state probability of an infinite state Discrete Time Markov Chain with a periodic structure. This structure is exploited to develop an efficient numeric solution where different accuracy/computation time trade-offs can be obtained by operating on the granularity of the model. More importantly we offer a closed form conservative bound for the probability of a deadline miss. Our experiments reveal that the bound remains reasonably close to the experimental probability in one real-time application of practical interest. When this bound is used for the optimisation of the overall Quality of Service for a set of tasks sharing the CPU, it produces a good sub-optimal solution in a small amount of time.Comment: IEEE Transactions on Parallel and Distributed Systems, Volume:27, Issue: 3, March 201

Bi-Hamiltonian Aspects of a Matrix Harry Dym Hierarchy

We study the Harry Dym hierarchy of nonlinear evolution equations from the bi-Hamiltonian view point. This is done by using the concept of an S-hierarchy. It allows us to define a matrix Harry Dym hierarchy of commuting Hamiltonian flows in two fields that projects onto the scalar Harry Dym hierarchy. We also show that the conserved densities of the matrix Harry Dym equation can be found by means of a Riccati-type equation.Comment: Revised version, 22 pages; a section on reciprocal transformations added. To appear in J. Math. Phys

Beyond Zipf's Law: The Lavalette Rank Function and its Properties

Although Zipf's law is widespread in natural and social data, one often encounters situations where one or both ends of the ranked data deviate from the power-law function. Previously we proposed the Beta rank function to improve the fitting of data which does not follow a perfect Zipf's law. Here we show that when the two parameters in the Beta rank function have the same value, the Lavalette rank function, the probability density function can be derived analytically. We also show both computationally and analytically that Lavalette distribution is approximately equal, though not identical, to the lognormal distribution. We illustrate the utility of Lavalette rank function in several datasets. We also address three analysis issues on the statistical testing of Lavalette fitting function, comparison between Zipf's law and lognormal distribution through Lavalette function, and comparison between lognormal distribution and Lavalette distribution.Comment: 15 pages, 4 figure

A Software-based Low-Jitter Servo Clock for Inexpensive Phasor Measurement Units

This paper presents the design and the implementation of a servo-clock (SC) for low-cost Phasor Measurement Units (PMUs). The SC relies on a classic Proportional Integral (PI) controller, which has been properly tuned to minimize the synchronization error due to the local oscillator triggering the on-board timer. The SC has been implemented into a PMU prototype developed within the OpenPMU project using a BeagleBone Black (BBB) board. The distinctive feature of the proposed solution is its ability to track an input Pulse-Per-Second (PPS) reference with good long-term stability and with no need for specific on-board synchronization circuitry. Indeed, the SC implementation relies only on one co-processor for real-time application and requires just an input PPS signal that could be distributed from a single substation clock

Amleto doppiato: Analisi degli adattamenti dei dialoghi nei film di Olivier, Zeffirelli e Branagh

L’indagine svolta, dopo una breve analisi del rapporto tra Shakespeare e il cinema, si divide in due direzioni principali. Una prima più tecnica e strettamente legata all’ambito del doppiaggio, vale a dire una ricerca volta a scoprire quali problematiche sono state incontrate dagli adattatori delle tre trasposizioni filmiche dell’Amleto di Shakespeare e quindi come esse sono state risolte. Un secondo filone di ricerca si incarica, invece, di mettere in luce, in che modo il film viene alterato dalle operazioni di doppiaggio e adattamento e quindi quali conseguenze comporta questa pratica di traduzione multimediale. In modo da comprendere più precisamente quali scelte di adattamento effettuate fossero da imputare esclusivamente a valutazioni di carattere semantico, mentre quali altre fossero state imposte da esigenze di sincronia labiale, abbiamo deciso di fare riferimento, oltre alle suddette tre versioni cinematografiche, a quattro tra le più autorevoli versioni italiane disponibili in libreria. I testi dell’Amleto scelti sono: la versione di Lombardo, quella di Montale, Serpieri, nonché una versione cartacea dello stesso Masolino D’amico adattatore anche della pellicola diretta da Kenneth Branagh. Quest’ultimo traduttore, essendo appunto autore di entrambi in generi mediatici, ci aiuta oltremodo, a capire alcune delle dinamiche che si possono venire a creare durante il passaggio dall’inglese all’italiano. Ad avvalorare alcune delle ipotesi formulate nel corso delle indagini sono state condotte, inoltre, due interviste di cui è disponibile il contributo video: la prima a Masolino d’Amico, professore di letteratura inglese all’Università di Roma3, e collaboratore di Franco Zeffirelli e quindi responsabile dei dialoghi italiani della sua pellicola. Una seconda intervista, invece, a Francesco Vairano, noto adattatore cinetelevisivo romano, membro AIDAC, e autore per il film di Branagh delle operazioni di adattamento, nonché direttore del doppiaggio dell’opera stessa