1,721,084 research outputs found
Diode Zener Feedback Preamplifier for Zero-Crossover Optical Encoders
No full textA novel preamplifier system to improve the performance of zero-crossover optical encoders is presented. The network is based on a low-noise operational amplifier with a Zener diode feedback. We propose to exploit the non-linear characteristic of this network to reduce the angular measurement uncertainty. The circuit has been accordingly developed and tested in operation
Quantum metrology in Lipkin-Meshkov-Glick critical systems
No full textThe Lipkin-Meshkov-Glick (LMG) model describes critical systems with interaction beyond the first-neighbor approximation. Here we address quantum metrology in LMG systems and show how criticality may be exploited to improve precision. At first we focus on the characterization of LMG systems themselves, i.e., the estimation of anisotropy, and address the problem by considering the quantum Cramér-Rao bound. We evaluate the quantum Fisher information of small-size LMG chains made of N=2, 3, and 4 lattice sites and also analyze the same quantity in the thermodynamical limit. Our results show that criticality is indeed a resource and that the ultimate bounds to precision may be achieved by tuning the external field and measuring the total magnetization of the system. We then address the use of LMG systems as quantum thermometers and show that (i) precision is governed by the gap between the lowest energy levels of the systems and (ii) field-dependent level crossing is a metrological resource to extend the operating range of the quantum thermometer
La pratica del contemporaneo nell'Università: esperienze e riflessioni
No full textNell'ambito di un volume collettaneo, il secondo di una collana di quaderni nati presso la Facoltà di Lettere di Napoli (oggi Dipartimento di Lettere e Beni Culturali), quale spazio di riflessione e di confronto tra studiosi ed operatori nel settore dei beni culturali, il contributo prende in esame il tema dell'insegnamento e della ricerca in relazione alla produzione artistica contemporanea nelle università. Nello specifico lo scritto si sofferma sull' esperienza personale maturata e sviluppata presso l' Università di Ferrara, richiamando una metodologia di lavoro e quindi di pratiche sul campo, ma anche ponendo riflessioni ed interrogativi sul sistema di trasmissione del sapere e della cultura del contemporaneo nelle aule accademiche
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
Operational Risk Vs. Capital Requirements under New Italian Banking Capital Regulation: Are Small Banks Penalized? A Clinical Study
No full textOur research finds out the potential competitive impact of the new Italian Banking capital regulation for operational risks. Differently from the approach underlying the new discipline of the United States and many European countries, the Italian regulation allows the access to the advanced measurement approaches (AMA) only to banks and financial intermediaries whose size or specialization requirements meet predefined levels. In our research we compare the capital at risk (estimated with a one year holding period and a 99.9th percentile confidence interval) and the capital charge calculated by basic indicator methodology. Using operational loss data of one bank that does not meet regulation constraints, we show the unfair penalization of the new supervisory regulation on capital requirements for a large group of intermediaries
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Synchronous phase to voltage converter for true-phase polarimeters
No full textThis paper describes a front-end electronics designed to process the signals generated by a true-phase polarimeter. The design of the network is oriented to minimize the phase angle measurement uncertainty. The circuit has been accordingly developed and tested in operation. Exploiting a precise analogue phase-to-voltage converter based on a synchronous detection scheme, the network exhibits a phase angle measurement uncertainty less than 0.35 mdeg. The circuit exhibits excellent rejection of uncorrelated noise, disturbances, offsets and harmonics
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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