Publications INFN

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2017-02-03
16:34
Clocking and scientific research: the opinion of the scientific community / Mario Macrì ; Stefano Bellucci ; Stefano Bianco ; Andrea Sansoni [PUBLICATIONINFN-2017-002] Clocking work time is generally not recognised as an effective mean of evaluating quality and extent of research work. This study show results of survey carried on at the onset of the establishment of clocking for researchers in the Italian public research system. 10.15161/oar.it/1486138837.95
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2017-01-12
16:17
Speed hysteresis and noise shaping of traveling fronts in neural fields: role of local circuitry and nonlocal connectivity / Capone, Cristiano ; Mattia, Maurizio [PUBLICATIONINFN-2017-001] Neural field models are powerful tools to investigate the richness of spatiotemporal activity patterns like waves and bumps, emerging from the cerebral cortex. Understanding how spontaneous and evoked activity is related to the structure of underlying networks is of central interest to unfold how information is processed by these systems. Here we focus on the interplay between local properties like input-output gain function and recurrent synaptic self-excitation of cortical modules, and nonlocal intermodular synaptic couplings yielding to define a multiscale neural field. In this framework, we work out analytic expressions for the wave speed and the stochastic diffusion of propagating fronts uncovering the existence of an optimal balance between local and nonlocal connectivity which minimizes the fluctuations of the activation front propagation. Incorporating an activity-dependent adaptation of local excitability further highlights the independent role that local and nonlocal connectivity play in modulating the speed of propagation of the activation and silencing wavefronts, respectively. Inhomogeneities in space of local excitability give raise to a novel hysteresis phenomenon such that the speed of waves traveling in opposite directions display different velocities in the same location. Taken together these results provide insights on the multiscale organization of brain slow-waves measured during deep sleep and anesthesia. 10.1038/srep39611
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2015-12-02
10:04
Tools and facilities of the Milan section of the INFN / F. Broggi In this note the main tools, experimental capabilities, and intellectual know-how of the Milan section of the INFN are listed. The main purpose is to spread out informations outside INFN and especially to the productive world, as a starting point towards future collaborations with the industries. 10.15161/oar.it/1449018202.72
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2015-12-02
10:04
Diffraction radiation of electron bunches for one- and two-slit systems / V. Shpakov ; S. B. Dabagov New research in acceleration physics leads to growing up the power of charged particles bunches. Existed methods based on interaction of detection devices with bunches do not satisfy our need, because of the fact that new high intensity bunches can damage this devices. Moreover, these methods do not allow analyzing the bunches in real time. Recently new technique based on ODRI (optical diffraction radiation interference) by a bunch at its propagation through the slit was proposed. In this work the results of theoretical simulations on diffraction radiation, in particular ODRI, by electrons for various slit systems as well as the comparison with the DESY experimental data are presented. 10.15161/oar.it/1449018202.64
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2015-12-02
10:04
Relativistic tests / M. Conte In this paper we propose to use as a tool for relativistic tests light ions capable of emitting e.m. radiation. Single-ionized Helium atoms look to be the most appropriate particles. 10.15161/oar.it/1449018202.56
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2015-12-02
10:04
Software per la rilevazione di vibrazioni / S. Fioravanti Descrizione del software per la rilevazione delle vibrazioni sull'apparato sperimentale KLOE. Di seguito, saranno descritti tutti i passaggi per una corretta configurazione di una scheda NI PXI-4472, e come compilare il software. 10.15161/oar.it/1449018202.48
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2015-12-02
10:04
MID2 / M. Cresta ; B. Gianesin ; M. Marinelli ; F. Pratolongo In questa nota si descrive lo strumento MID2 che sostituisce il prototipo all'ospedale Galliera di Genova per la misura non invasiva del sovraccarico di ferro nell'uomo. E' analizzato, brevemente, il principio di funzionamento dello strumento per proseguire con la spiegazione degli elementi che lo compongono cioè il Rack, il Suscettometro la Barella e il Laser. Per ogni parte si descrivono i suoi componenti e le loro connessioni. Nella seconda parte della nota si trovano tutti gli schemi elettrici necessari alla comprensione del funzionamento dello strumento che fanno parte integrante del fascicolo tecnico consegnato all'ospedale. 10.15161/oar.it/1449018202.41
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2015-12-02
10:04
PRESS-MAG-O: status of the commissioning and of the associated R&D / A. Puri ; A. Marcelli ; M. Cestelli Guidi ; P. Postorino ; et al PRESS-MAG-O is a unique innovative apparatus under commissioning at the Laboratori Nazionali di Frascati of the Istituto Nazionale di Fisica Nucleare (INFN), designed to perform experiments on materials under extreme conditions. The instrument will allow concurrent magnetic and spectroscopic experiments under high pressure and high DC magnetic field in a wide temperature range. A highly sensitive SQUID gradiometer designed to fit inside a diamagnetic DAC cell and cooled inside the cryostat hosting a 8 T superconducting magnet is the heart of the instrument. The cryostat has been designed with four access ports two of them equipped with special windows and optical lenses to focus and collect radiation down to the IR region to perform spectroscopic experiments on the sample loaded in the DAC. In this report we summarize the technical characteristics of the system and the status of test and commissioning at the end of 2011. 10.15161/oar.it/1449018202.33
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2015-12-02
10:04
Electrostatic Storage Ring / M. Conte In the trial [1] of measuring the proton electric moment, storage rings with electrostatic lattice have been considered. Here an overview is given about the main parameters regarding such a kind of focusing. Beyond confirming all the issues regarding this subject, a non-null element M31 is introduced in all the 3x3 matrices which deal with the vector(x, x',Δp/p) and its role is discussed. 10.15161/oar.it/1449018202.25
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2015-12-02
10:04
The Fancy Table, a 5-axis silicon detector beam test bench / G. Alampi ; G. Cotto ; P. Mereu ; D. Gamba We describe a specially designed motorized table, the 'fancy table', to test on a beam line prototypes of devices, like MAPS, HyPixels, microstrip detectors, with sensible area varying from few mm2 to dozens of cm2. 10.15161/oar.it/1449018202.17
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