1,721,002 research outputs found
Pulsed Tunnel Operating Non Volatile Flash Memories with SILC Reduction
No full textIn this work we demonstrate a noticeable reduction of SILC in Flash memories operating in pulsed regime. With the
pulsed operation methodology better cycling and data retention features can be achieved, or cell scaling pursued, being
reliability no longer a major concern. Benefits have been demonstrated on single cells and large arrays, with oxide
thickness down to 3.5 nm. The methodology suits on fully tunnel operating memory architectures
Magnetic-Field Confinement of a Laser-Produced Plasma
No full textRuby-laser pulses have been focused onto planar targets of beryllium in a magnetic field,B=17 kG. The field was oriented parallel to the direction of the incoming laser beam and perpendicular to the target surface. It was balancing the kinetic pressure of the plasma at a few millimeters from the target. Spectroscopic observations, both time integrated and time resolved, have shown the magnetic-confinement effect. In particular, a reduction of the transverse plasma-plume size and a density increase and slower expansion, in the presence of the magnetic field, have been observed. In the introduction, a short review of the most recent papers on the subject is reported
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
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
Optical Near-Field Harmonic Demodulation in Apertureless Microscopy
No full textSpatial derivatives of the optical fields scattered by a surface can be investigated by apertureless near-field optical microscopy by modulating sinusoidally the probe to sample distance and detecting the optical signal at the first and higher harmonics. Demodulation up to the fifth harmonic order has been accomplished on a sample of close-packed latex spheres by means of the silicon tip of a scanning interference apertureless microscope. The working principles of such microscope are reviewed. The experimental configuration used comprises a tuning-fork-based tapping-mode atomic force microscope for the distance stabilization, and a double-modulation technique for complete separation of the topography tracking from the optical detection. Simple modelling provides first indications for the interpretation of experimental data. The technique described here provides either artefact-free near-field optical imaging, or detailed information on the structure of the near fields scattered by a surface
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
The Italian Way of Counterterrorism: From a Consolidated Experience to an Integrated Approach
No full textItaly has a long history of struggle against terrorism. At least since the mid-1970s, it has developed a national counterterrorism (CT) strategy, combining a range of different tactics and tools. Over the decades Italy has had to respond to many forms of violence: ethno-nationalist, right-wing, left-wing, anarchist, and jihadist. It is worth noting that right-wing, left-wing, and anarchist terrorism represented an indigenous phenomenon, even if many of these armed groups had significant connections abroad. On the contrary,
ethno-nationalistic terrorism in the 1960s was perceived as inspired and supported by foreign forces, and jihadist terrorism is now a transnational threat. This chapter outlines the evolution of Italy’s CT policy, from a social science perspective. It distinguishes two major phases. In the first phase
(from the 1960s to the 1980s), during the time of the so-called First Republic at the national level and the Cold War at the international level, the country dealt with separatist violent incidents and, above all, with a long
and intense campaign of right-wing and left-wing terrorism, during the Anni di piombo (Years of Lead). In the second phase (from the 1990s to the present day), at the time of the Second Republic and in the post-Cold War era, Italy has had to face new challenges, especially from jihadist extremism
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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