1,354,076 research outputs found
HIS Design for an Environment-Robust UHF/UWB Antenna with 3D-Printed Inclusions
No full textThe necessity for autonomous energy devices to
monitor and locate items/people involves combining Ultra High
Frequency (UHF) transmissions for power and Ultra-Wideband
(UWB) signals for communication. To accomplish these
requirements, this article proposes the design and development
of a multipurpose antenna. The presence of a High Impedance
Surface (HIS) allows one-port spiral-dipole combination to
achieve insensitivity to the background platform while still
maintaining a low-profile stack-up structure; no back-radiations
within the entire frequency range, circular polarization in the
UWB band, and high efficiency in the UHF band. Furthermore,
for the proposed feeding mechanism, the usage of 3D printing
appears to be strategic for the structure’s robustness and for the
adopted feeding mechanism
A Hybrid RFID/Localization Antenna with HIS and 3D-Printed Inclusions
No full textThe need for tracking and localizing items/people through energy autonomous devices suggests the combined exploitation of Ultra High frequency (UHF) to supply power and Ultra-Wideband (UWB) signals for communication. This paper proposes the design and implementation of a versatile antenna to fulfil those requirements. The one-port spiral-dipole combination achieves the insensitivity to the background scenario through the presence of a High Impedance Surface (HIS) able to simultaneously guarantee unique performance, still maintaining a low-profile stack-up: no back-radiation in the entire frequency range, circular polarization in the UWB band, and high efficiency in the UHF one. The use of 3D printing reveals to be strategic for the robustness of the structure and for the adopted feeding mechanism
UHF and ISM Band MIMO Antenna for an Energy-Autonomous SWIPT system
No full textThis paper presents the design of a dual-port MIMO antenna that consists of two probe-fed radiating elements. One compact folded monopole for the UHF band matched from 840 to 945 MHz covering a bandwidth of 105 MHz, and a fully grounded patch antenna for the ISM band operating from 2.40 to 2.48 GHz, covering a bandwidth of 80 MHz. The isolation between
the two ports of the MIMO antenna is better than –20 dB. The proposed MIMO antenna is a suitable candidate for an energy autonomous SWIPT system
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
No full textWe 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
A Hybrid RFID/Localization Antenna with HIS and 3D-Printed Inclusions
No full textThe need for tracking and localizing items/people through energy autonomous devices suggests the combined exploitation of Ultra High frequency (UHF) to supply power and Ultra Wideband (UWB) signals for communication. This paper proposes the design and implementation of a versatile antenna to fulfil those requirements. The one-port spiral-dipolecombination achieves the insensitivity to the background scenario through the presence of a High Impedance Surface (HIS) able to simultaneously guarantee unique performance, still maintaining a low-profile stack-up: no back-radiation in the entire frequency range, circular polarization in the UWB band, and high efficiency in the UHF one. The use of 3D-printing reveals to be strategic for the robustness of the structure and for the adopted feeding mechanis
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
Author, publisher and bookseller : a tripartite synergy in Nigerian book industry
No full textThis work is about the roles of Author, Publisher and Bookseller in Book development in
Nigeria. The paper started by delving into the history of Book Publishing in Nigeria after
which it proceeded by defining who an author, a publisher, and a bookseller is and
expatiated on the indispensable roles of these key actors in Nigerian Book Industry and in
the emerging Information Society. Furthermore, the various constraints to book
development were identified while the paper advised on how the Book Industry can be
further promoted in Nigeria. However, the paper concluded and made recommendations
on how the Book sector can help in enhancing scholarship in the country
- …
