1,720,976 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
Use of RTDS to investigate the role of digital substation data for realising integrated network operator functions
Full text linkModellizzazione di un tratto di linea reale con i simulatori RTDS, applicazione del modello per studi sulla rete quali distanza di guasto, flussi di potenza e campionamento dei dati.ope
Adaptive protection solutions for future active power distribution networks
Full text linkPower distribution networks are undergoing a continuous evolution from being passive to active in nature, with increasing penetration of distributed generation and the introduction of active network management schemes to facilitate increased distributed generation connections, automatically manage and reconfigure the network, optimise voltages and power losses and improve power supply reliability. The purpose of the research presented in this dissertation is to investigate the protection challenges that this evolution will introduce to the functions of protecting distribution networks, to develop new solutions and implement and demonstrate them in the laboratory. To analyse the potential problems that may be introduced to traditional protection systems, a detailed analysis of the impact of distributed generation, network automation and islanded operation has been undertaken using a hardware in the loop simulation of a network model representative of typical UK rural distribution networks. This analysis has demonstrated certain protection challenges (and disproved others) associated with overcurrent and loss of mains protection of future active power distribution networks. Two solutions to the demonstrated challenges have been developed: a new adaptive overcurrent protection system with automatic settings calculation, which overcomes the demonstrated sensitivity, selectivity and coordination problems associated with overcurrent protection; and a novel adaptive inter-tripping scheme with back-up passive loss of mains protection, which overcomes the demonstrated sensitivity and stability problems associated with loss of mains protection. The developed protection solutions have been implemented on commercially available hardware and tested using an hardware in the loop simulation environment. The performance of both solutions has been compared to traditional overcurrent and loss of mains protection systems, which are configured in accordance with UK distribution network operator protection policy. The results of this comparison have shown the effectiveness of the developed solutions in overcoming the demonstrated protection problems associated with future active power distribution networks.Power distribution networks are undergoing a continuous evolution from being passive to active in nature, with increasing penetration of distributed generation and the introduction of active network management schemes to facilitate increased distributed generation connections, automatically manage and reconfigure the network, optimise voltages and power losses and improve power supply reliability. The purpose of the research presented in this dissertation is to investigate the protection challenges that this evolution will introduce to the functions of protecting distribution networks, to develop new solutions and implement and demonstrate them in the laboratory. To analyse the potential problems that may be introduced to traditional protection systems, a detailed analysis of the impact of distributed generation, network automation and islanded operation has been undertaken using a hardware in the loop simulation of a network model representative of typical UK rural distribution networks. This analysis has demonstrated certain protection challenges (and disproved others) associated with overcurrent and loss of mains protection of future active power distribution networks. Two solutions to the demonstrated challenges have been developed: a new adaptive overcurrent protection system with automatic settings calculation, which overcomes the demonstrated sensitivity, selectivity and coordination problems associated with overcurrent protection; and a novel adaptive inter-tripping scheme with back-up passive loss of mains protection, which overcomes the demonstrated sensitivity and stability problems associated with loss of mains protection. The developed protection solutions have been implemented on commercially available hardware and tested using an hardware in the loop simulation environment. The performance of both solutions has been compared to traditional overcurrent and loss of mains protection systems, which are configured in accordance with UK distribution network operator protection policy. The results of this comparison have shown the effectiveness of the developed solutions in overcoming the demonstrated protection problems associated with future active power distribution networks
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 methodology for on-site measurement of Voltage Transformer magnitude and phase ratio as a function of frequency
Full text linkInductive Voltage Transformers are commonplace in low and medium voltage power distribution networks and are important for network monitoring and protection. Their performance at frequencies above 50Hz, defined as maintaining transformer ratio and input/output phase relationship, is often completely unknown. It is also a challenge to remove VTs from existing installation points to test thoroughly for VT ratio and phase frequency response using the standard swept-sine variable frequency testing. To meet this challenge, the Power Networks Demonstration Centre (PNDC) has developed a technique which relies on a harmonic analysis of the relationship between the transformer input and output. In laboratory testing it has a speed and safety advantage over conventional techniques, while in the future it may allow comparison with known levels of harmonics distortion on the distribution network to calculate the performance at higher frequencies of VTs in-situ
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