1,721,004 research outputs found
Monitoring single event upsets in SRAM-based FPGAs at the SuperKEKB interaction point
No full textIn February 2016, the SuperKEKB positron-electron high-luminosity collider of the KEK laboratory (Tsukuba, Japan) started being commissioned. A dedicated commissioning detector, named BEAST2, has been used to characterize beam backgrounds before the Belle2 detector was rolled into the beams and to provide tuning parameters for Monte Carlo simulations. BEAST2 consists of a fiberglass support structure and several sub-detectors mounted onto it, including time projection chambers (TPCs) and He-3 tubes. In this work, we present direct measurements of radiation-induced single event upsets in a SRAM-based FPGA device installed in BEAST2 at a distance of ~ 1 m from the beam interaction point. Our goal was to provide experimental results of the expected radiation-induced configuration upset rate and power consumption variation at Belle2 and at other experiments operating in similar radiation environments. Beam currents for both electron and positron rings spanned a range between 50 and 500 mA, therefore providing data about the FPGA operation in different radiation conditions. Even if the machine has not been providing collisions yet, as the beams were not focused to the interaction point, our results show a rate of 0.15 upsets/day averaged over the whole commissioning time frame. We had neither evidence of total dose effects on the FPGA power consumption nor of permanent damage to the device
La progettazione di un modello interattivo e digitale di fruizione museale: l’esperienza del Museu do Brinquedo
No full textPEER HOMEWORK 2.0.
No full textLa ricerca scientifica e la scuola continuano ad interrogarsi sulle modalità di
insegnamento e di apprendimento con le nuove tecnologie, sulla formazione
dei docenti e sugli strumenti mediali messi a disposizione per fronteggiare il
cambiamento, soprattutto considerando quanto previsto
dal Piano Nazionale Scuola Digitale (PNSD)
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
A Radiation-Tolerant, Multigigabit Serial Link Based on FPGAs
No full textMultigigabit serial links implemented by means of static random access memory (SRAM)-based field-programmable gate arrays (FPGAs) are extensively used in trigger and data acquisition systems of high-energy physics experiments. Their usage is mostly in areas without radiation, due to the sensitivity of FPGA configuration memory to single-event upsets. In order to use these links in radiation environments, some mitigation techniques can be used. In this article, we present a bidirectional link running at 6.25 Gbps implemented in Xilinx Kintex-7 FPGAs. Transferred data are protected against radiation effects by means of a Reed-Solomon (RS) code and symbol interleaving. Logic features triple modular redundancy in critical blocks. The design includes a custom scrubber based on majority voting of configuration frames. Our custom protocol can vary the protection level of the RS code to cope with different rates of radiation-induced transmission errors, trading off the available bandwidth for reliability. We present the test results carried out using fault injection and a 62-MeV proton beam at the Istituto Nazionale di Fisica Nucleare (INFN) Laboratori Nazionali del Sud (Catania, Italy). We show the performance of the link in terms of mean time between failures and mean time between losses of lock
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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