1,720,954 research outputs found
Power system failures as a threat to safety in transport
No full textW artykule autor przedstawił wpływ awarii w systemach elektroenergetycznych na funkcjonowanie różnego rodzaju środków transportu. Brak zasilania w energię elektryczną, szczególnie w długim okresie czasu oraz na znacznym obszarze, powoduje powstanie chaosu komunikacyjnego, który może mieć bezpośredni wpływ na zagrożenie życia pasażerów. Autor zaproponował rozwiązania, które przynajmniej w pewnym stopniu, pozwolą ograniczyć chaos komunikacyjny powstający w przypadku
awarii krajowego systemu elektroenergetycznego.In the article, the author presents the impact of failures in power
systems on the functioning of various types of transport. An interruption in the power supply, especially over a long period of time and over a large area, creates communication chaos that can have a direct impact on the life threat to passengers. The author proposes solutions that limit the communication chaos arising in the event of a failure of the national power system
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Jakość energii elektrycznej w obwodach podstacji trakcyjnej prądu stałego
No full textRail transport in Poland uses direct current electric traction to power vehicles (locomotives and multiple units). It is therefore necessary to convert the AC voltage of the power system into the DC voltage of the traction system. The conversion of alternating voltage into direct voltage takes place in traction substations. Rectifier units installed at traction substations are used for this purpose. As a result, electric traction should be classified as non-linear consumers. In addition, the traction substation load changes dynamically. All this makes the electric traction a recipient generating a number of disturbances to the network. These disturbances affect the quality of electricity in the power system from which the traction substations are supplied, and the quality of energy in auxiliary and non-traction lines. The article presents the results of the analysis of measurements of electricity quality indicators recorded at selected points of the traction substation line. Parameters characterizing the quality of electricity were recorded, among others, in in the main line supplying the traction substation, non-traction needs line and auxiliary circuits. The presented article is another in a series of publications related to the assessment of the impact of DC electric traction on the power system.Transport kolejowy w Polsce wykorzystuje do zasilania pojazdów (lokomotyw i zespołów trakcyjnych) trakcję elektryczną prądu stałego. Konieczne jest zatem przekształcenie napięcia przemiennego systemu elektroenergetycznego na napięcie stałe systemu trakcyjnego. Zamiana napięcia przemiennego na napięcie stałe odbywa się w podstacjach trakcyjnych. Wykorzystywane do tego celu są zespoły prostownikowe zainstalowane na podstacjach trakcyjnych. Sprawia to, że trakcję elektryczną zaliczyć należy do obiorców o charakterze nieliniowym. Dodatkowo obciążenie podstacji trakcyjnej zmienia się w sposób dynamiczny. Wszystko to powoduje, że trakcja elektryczna jest odbiorcą generującym do sieci szereg zaburzeń. Zaburzenia te wpływają na jakości energii elektrycznej systemu elektroenergetycznego, z którego zasilane są podstacje trakcyjne oraz jakość energii w liniach potrzeb własnych i potrzeb nietrakcyjnych. Artykuł przestawia wyniki analizy pomiarów wskaźników jakości energii elektrycznej zarejestrowanych w wybranych punktach linii podstacji trakcyjnych. Parametry charakteryzujące jakość energii elektrycznej zarejestrowano m.in. w głównej linii zasilającej podstację trakcyjną, linii potrzeb nietrakcyjnych oraz obwodach potrzeb własnych. Prezentowany artykuł jest jednym z cyklu publikacji związanych z oceną oddziaływania trakcji elektrycznej prądu stałego na system elektroenergetyczny
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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