1,721,509 research outputs found
Le ultime tendenze: Fabio Quaranta / The latest trends: Fabio Quaranta
No full textpresentazione e analisi del lavoro del fashion designer Fabio Quarant
Spatial field estimation through wireless sensor networks under bandwidth constraints
No full textWe consider an environmental monitoring application
where a scalar field (e.g., atmospheric pressure) is to
be sensed by randomly distributed nodes. Each node takes a
sample of a l-dimensional signal in its position and sends it to a
collector entity through a wireless link. The latter performs signal
reconstruction based on the received samples. Because of total
bandwidth constraints, the transmission rate per node is limited.
Hence, sensors are supposed to reduce the amount of information
to be sent through quantization of the measurements. On the one
hand, an increased amount of nodes deployed results in a more
accurate sampling of the signal. On the other hand, it forces each
sensor to perform looser quantization to cope with the smaller
fraction of bandwidth allocated. From the theory of random
sampling and by accounting for quantization, we compute the
mean square error (MSE) in the reconstruction of the original
signal. We then show the existence of an optimal deployment
density that trades off between quantization error and aliasing
error due to random sampling
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
Effects of single-layer Shockley stacking faults on the transport properties of high-purity semi-insulating 4H–SiC
No full textThe electrical properties of high-purity 4H–SiC epitaxial layers are investigated. The current density
versus applied voltage curves shows that some specimens have space charge limited transport
behavior. Lampert–Mark model for trap-controlled electron transport in semi-insulating materials
demonstrated the presence of an intragap state at 0.26 eV below the conduction band. Photodeep
level transient spectroscopy has confirmed the presence of a deep level at about 0.3 eV below the
conduction band only in samples with non-Ohmic behavior. Cathodoluminescence imaging has
revealed the presence of high luminescent areas related to stacking faults SFs under the devices
showing non-Ohmic behavior. The presence of single-layer SFs was detected by
cathodoluminescence spectroscopy due to the typical emission at 2.95 eV. Thus, we demonstrated
that the SFs modified the charge transport from Ohmic conduction to space charge limited
conduction of the affected samples. © 2010 American Institute of Physics. doi:10.1063/1.345616
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
4H-SiC band structure investigated by surface photovoltage spectroscopy
No full textThe conduction and valence band structure of high-purity 4H-SiC epilayers have been studied by surface photovoltage spectroscopy
(SPS). A comparison between defect-free and single-layer stacking fault affected areas is reported. Electronic transitions, determined by
SPS, are in good agreement with ab initio calculations. Electronic transitions and changes in band occupation have been observed in
stacking fault rich areas below the band gap. Moreover, stacking faults induce the presence of a split-off band below the conduction
band and a modification of the electron density of states in the conduction band always at the M point
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
La lingua della canzone
No full textIl contributo offre un panorama della lingua della canzone italiana diversificata per generi, momenti, autori e gusti musical
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