1,720,969 research outputs found
Nanopatterning of photonic crystals with a photocurable silica-titania organic-inorganic hybrid material by a UV-based nanoimprint technique
No full textUV patternable high refractive index inorganic-organic hybrid materials prepared by sol-gel process can be nanoimprinted in order to get photonic crystal nanopatterns. Non-hydrolytic sol-gel process can make a UV curable and relatively high refractive index hybrid material, which can be cured without a significant shrinkage for nanoimprinting. Sol-gel process of heterogeneously functionalized silicon alkoxides can make the organically modified inorganic Si-O-Ti network very well. The UV-based nanoimprint technique utilizes transparent templates and UV curable high refractive index materials to allow pattern replication at room temperature and very low pressure. UV-based nanoimprint technique is an efficient way to fabricate this sort of polymeric photonic crystal nanostructures.This work is supported by the Sol–Gel Innovation Project
(SOLIP) of the Ministry of Commerce, Industry and Energy of
Korea
Fabrication of low-loss waveguides using organic-inorganic hybrid materials
No full textThe fabrication of single and multimode waveguides and optical characteristics were investigated. The singlemode waveguide was fabricated by a laser direct writing technique and a multimode waveguide was produced by means of a direct UV patterning technique using organic-inorganic hybrid materials. The fabrication of waveguide channels with these techniques are of interest for simple processes. The resulting single and multimode waveguides exhibited a near rectangular shape and low optical loss. The average propagation losses of these waveguides were 0.07 dB/cm (at 850 nm) and 0.3 dB/cm (at 1310nm), respectively
Flexible Film Optical Waveguide with Little Bending Loss Fabricated by UV Moulding of Sol-Gel Hybrid Materials
No full textExperimental demonstration of 10 Gbit/s transmission with an optical backplane system using optical slots
No full textA practical optical backplane system was prepared with transmitter-receiver processing boards and an optical backplane made from polymeric-waveguide-embedded optical printed-circuit boards. Optical slots were used as connection components between the transmitter-receiver processing boards and the backplane board to permit easy and repeatable insertion and extraction of the boards with micrometer precision. We report 10 Gbit/s data transmission between an optical backplane and the transmitter-receiver processing boards. (c) 2005 Optical Society of America
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
- …
