1,721,067 research outputs found
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
Changing passband on microstrip hairpin band-pass filter
Full text linkDue to copyright restrictions, the access to the full text of this article is only available via subscription.In this work, a microstrip hairpin band-pass filter is designed and simulated in Sonnet Suite, a 3-D Planar Electromagnetic simulation tool [1]. A microstrip hairpin band-pass filter in any desired pass band can be obtained by modifying the length of CL parameter
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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
New circuit configuration and control strategy of modular multilevel converter for large scale photovoltaic systems / Ahmed Ibrahim Ibrahim Abbas Ahmed Elsanabary
No full textPhotovoltaic (PV) energy markets have been widely spread and are becoming one of
the leading energy generation capacities globally. The development of grid-connected PV
systems is the main target as it exceeds 99 % of the PV installed capacity due to the
comparatively low cost and less maintenance compared to stand-alone systems.
Nevertheless, the traditional large-scale PV inverters suffer from power loss of the central
maximum power point tracking (MPPT) system, the lack of modularity, the low voltage
ratings, and limitation of the switch power ratings because of the use of central PV
inverters. Modular medium-voltage multilevel converters are very promising to solve the
problems of large-scale PV systems. However, the integration of multilevel converters
into large-scale PV systems suffers from unbalanced power generation during partial PV
shading conditions. This problem is fully addressed in the thesis, and a distinctive
structure of the modular multilevel converter (MMC) for grid-connected PV plant is
proposed. The proposed PV-MMC system provides direct connection of the PV arrays to
the converter submodules, scalability, independent MPPT, enhanced power quality, and
internal power flow capabilities. An energy balancing strategy to control the power flow
inside the PV-MMC converter is proposed. It controls the internally generated leg current
to balance the power flow inside the converter and inject a three-phase balanced current
into the grid. Afterward, a new circuit configuration of the PV-MMC system is proposed
to enhance the balancing capability of MMC under severe power unbalance conditions.
This circuit connects the upper and lower SMs of the MMC in parallel to the same PV
arrays through isolated dc-dc converters. Moreover, a modified control structure is
designed to control the proposed system, which is less complex and yet very effective compared to the other control structures. It deals only with the leg power unbalance
conditions and inject dc leg current into the phases to balance the power flow of the
converter. Simulation and Hardware-in-the-loop tests are performed to demonstrate the
performance of the proposed grid-connected PV-MMC systems. The obtained results
show the capability of the proposed systems to rebalance the power transfer inside the
converter and inject a three-phase balanced set of grid currents. In addition, excellent
dynamic performance of controllers, low measured harmonics (below 5 %), and low SM
voltage ripple (3.98%) are obtained. The objective of the thesis is achieved by
investigating the MMC for the application to grid connected large-scale PV systems. The
related analysis and comparisons show the capability and power quality of the proposed
PV-MMC systems. The proposed energy balancing strategy can eliminate the PV power
unbalance and work under different conditions of solar irradiances. Moreover, the
proposed circuit configuration provides extended balancing capability of the MMC up to
extreme conditions
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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