Extraction of partonic transverse momentum distributions from semi-inclusive deep-inelastic scattering, Drell-Yan and Z-boson production

We present an extraction of unpolarized partonic transverse momentum distributions (TMDs) from a simultaneous fit of available data measured in semi-inclusive deep-inelastic scattering, Drell-Yan and Z-boson production. To connect data at different scales, we use TMD evolution at next-to-leading logarithmic accuracy. The analysis is restricted to the low-transverse-momentum region, with no matching to fixed-order calculations at high transverse momentum. We introduce specific choices to deal with TMD evolution at low scales, of the order of 1 GeV$^2$. This could be considered as a first attempt at a global fit of TMDs

A first determination of the unpolarized quark TMDs from a global analysis

Transverse momentum dependent distribution and fragmentation functions of unpolarized quarks inside unpolarized protons are extracted, for the first time, through a simultaneous analysis of semi-inclusive deep-inelastic scattering, Drell-Yan and $Z$ boson hadroproduction processes. This study is performed at leading order in perturbative QCD, with energy scale evolution at the next-to-leading logarithmic accuracy. Moreover, some specific choices are made to deal with low scale evolution around 1 GeV$^2$. Since only data in the low transverse momentum region are considered, no matching to fixed-order calculations at high transverse momentum is needed.Comment: 10 pages, 6 figures, 1 table; to appear in the Proceedings of the QCD Evolution 2017 Workshop, Newport News, Virginia (USA), 22 - 26 May 201

Anticollocated backstepping observer design for a class of coupled reaction-diffusion PDEs

The state observation problem is tackled for a system ofncoupled reaction-diffusion PDEs, possessing the same diffusivity parameter and equipped with boundary sensing devices. Particularly, a backstepping-based observer is designed and the exponential stability of the error system is proven with an arbitrarily fast convergence rate. The transformation kernel matrix is derived in the explicit form by using the method of successive approximations, thereby yielding the observer gains in the explicit form, too. Simulation results support the effectiveness of the suggested design

Boundary second-order sliding-mode control of an uncertain heat process with unbounded matched perturbation

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Method and system for regulating in real time the clock frequencies of at least one cluster of electronic machines

Method for regulating in real time the clock frequencies of at least one cluster of electronic machines, characterized in that it provides for carrying out the following steps: a) defining a finite number of discrete virtual capacity values f[l], f[2],.... 00 f[K], as global performance indices, of said cluster of machines; b) calculating by means of a randomized optimization procedure, for each value of said virtual capacity, a set of 1 vectors containing clock frequency values for each machine in said cluster; c) defin 00 ing a reference queue value, related to the number of processing requests received by said cluster; and provides for iteratively carry ing out the following steps: d) measuring the deviation between a current queue value, related to the number of processing requests in said current queue, and said reference queue value; e) selecting one of said discrete virtual capacity values on the basis of said » measured deviation, said selection occurring on the basis of a procedure that, at each iteration, analyzes said measured deviation, o compares it with the measured deviation value obtained at the previous iteration, and chooses whether to keep the current virtual ca - pacity value or to adopt one of the two adjacent or non-adjacent admissible virtual capacity values of said finite number of discrete values; f) selecting, based on said selected virtual capacity value, a vector of clock frequency values for each machine from said set o of 1 vectors, so as to optimize a multi-target performance index (J), and then setting the clock frequency of each machine in the cluste

Finite-Time Consensus with Disturbance Rejection by Discontinuous Local Interactions in Directed Graphs

In this technical note we propose a decentralized discontinuous interaction rule which allows to achieve consensus in a network of agents modeled by continuous-time first-order integrator dynamics affected by bounded disturbances. The topology of the network is described by a directed graph. The proposed discontinuous interaction rule is capable of rejecting the effects of the disturbances and achieving consensus after a finite transient time. An upper bound to the convergence time is explicitly derived in the technical note. Simulation results, referring to a network of coupled Kuramoto-like oscillators, are illustrated to corroborate the theoretical analysis

La Fenomenologia dello spirito di Hegel: Problemi e interpretazioni

[English]:The volume collects essays dedicated to the Phenomenology of the spirit of G.W.F. Hegel and to some of its main interpretations. It gathers critical essays on the Hegelian masterpiece and studies on Hegel’s influences on authors such as Marx, Gentile, Heidegger, Kojève, Paci, Lacan and Brandom. These contributions investigate some categorical nodes that have marked ensuing ethical, theoretical, philosophical-political and later psychoanalytic reflections: dialectic, culture, negation, desire, body, phenomenon, recognition. Therefore, this collection does not intend to mark a specific interpretation of the Hegelian text. Rather, the authors share the effort to illustrate in actu exercito the possibilities given by these two extremes – the text and its interpretation – in which later philosophical culture has moved. Through this movement the Phenomenology of the spirit continues to produce Philosophy, intended as an opportunity and an instrument for the understanding of "one's own time with thought". In addition to the editors, the volume hosts contributions from: Stefania Achella, Rossella Bonito Oliva, Alessio Calabrese, Teresa Caporale, Alessandro De Cesaris, Giuseppe Antonio Di Marco, Gianluca Garelli, Roberto Morani, Anna Pia Ruoppo./ [Italiano]: Il volume raccoglie saggi dedicati alla Fenomenologia dello spirito di G.W.F. Hegel e ad alcune sue principali interpretazioni. A scritti dal taglio più nettamente storiografico che ne ricostruiscono le influenze in autori quali Marx, Gentile, Heidegger, Kojève, Paci, Lacan e Brandom, si affiancano contributi volti a ricostruire alcuni nodi categoriali che, sollecitati dal testo hegeliano, hanno segnato le riflessioni etiche, teoretiche, filosofico-politiche e psicoanalitiche successive: dialettica, cultura, negazione, desiderio, corpo, fenomeno, riconoscimento. Questa raccolta non intende quindi né riproporre la lettera del testo hegeliano, né avanzare una sua specifica interpretazione. Piuttosto, gli autori hanno condiviso lo sforzo di illustrare in actu exercito le possibilità di movimento tra questi due estremi – testo e interpretazione – tra cui la cultura filosofica si muove. Attraverso questo movimento la Fenomenologia dello spirito continua a produrre filosofia, ossia ad essere occasione e strumento per la comprensione del “proprio tempo col pensiero”

Il laboratorio fotovoltaico come struttura di certificazione

2008-04-18Sala conferenze CIS, CagliariPresentazione del Laboratorio fotovoltaico del Cluster Energie rinnovabil

The three-dimensional distribution of quarks in momentum space

We present the distribution of unpolarized quarks in a transversely polarized proton in three-dimensional momentum space. Our results are based on consistent extractions of the unpolarized and Sivers transverse momentum dependent parton distributions (TMDs)