1,721,009 research outputs found
Review of \u3cem\u3eThe Fourth Amendment in Flux: The Roberts Court, Crime Control, and Digital Privacy.\u3c/em\u3eMichael C. Gizzi and R. Craig Curtis. Reviewed by Daniel Liechty
Full text linkMichael C. Gizzi and R. Craig Curtis, The Fourth Amendment in Flux: The Roberts Court, Crime Control, and Digital Privacy. University of Kansas (2016), 188 pages, $19.95 (paperback)
Integrated optical devices obtained by using LC and various waveguide technologies
No full textOral presentation at the Meeting SAMPA “Synclinic and Anticlinic Mesophases for Photonic Applications
Integrated optical switches using polymeric optical waveguides and SSFLC operating at 1.55 um
No full textWe present an optical switch made of a surface stabilized ferroelectric liquid crystal (SSFLC) and polymers at the telecommunication wavelength of 1550 nm
INFM Rome Group research activities
No full textOral presentation at the Meeting SAMPA “Synclinic and Anticlinic Mesophases for Photonic Applications
A polarization independent liquid crystal assisted vertical coupler switch
No full textA novel compact cascaded structure suitable for the realization of a 2 × 2 polarization independent integrated optical switch using liquid crystal is reported. The switch consists of a vertical coupler formed by two Ag +-Na + ion-exchanged single-mode channel waveguides diffused in two BK7 glass substrates of a liquid crystal cell, The coupling properties, and thus the switching state (bar or cross), of this structure can be controlled by electrically reorienting the director of the aligned liquid crystal layer. The device was simulated and optimized at λ = 1550 nm by using a beam propagation method algorithm. Calculated crosstalk attenuation and losses of an optimized TE switch with the TE 00 mode propagating in the input waveguide are 42.5 dB and 0.49 dB respectively with a coupling length of 141 μm. A TM switch, with the TM 00 propagating mode, exhibits a crosstalk attenuation of 37.7 dB and losses of 1.42 dB with a coupling length of 127 μm. Estimated average crosstalk attenuation and losses of a polarization insensitive cascaded switch are 39.7 dB and 0.93 dB respectively. The evaluated driving voltage magnitude required for the switching operation results below 20 V
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
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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