1,720,980 research outputs found
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
Monitoring of tailings dams with geophysical methods
No full textSeveral dam failure accidents have occurred during the last years and mine tailings dam failures are occurring at relatively high rates. Studies of past earth dam failures show embankment dam problems and failures are often related to internal erosion in one way or another. Geophysical methods have the potential of detecting internal erosion processes and anomalous seepage at an early stage of their development. The methods have been tested to monitor and investigate earth dams; however the methods have not been used very much in mine tailings dam. The present study has been conducted to test the applicability of geophysical methods, mainly electrical resistivity and self-potential (SP), for detecting anomalous seepage through mine tailing dams and monitoring the physical condition of the dam. Field measurements of resistivity and self-potential have been performed in the Kiruna, Aitik and Kristineberg tailings dams to look for streaming potentials, inhomogeneities and time variations of electrical properties and self-potentials. SP and resistivity measurements have also been carried out with fixed electrodes in the Kiruna and Kristineberg dam at a roughly monthly interval during one year starting in November 2003 and ending in October 2004. Laboratory measurements of resistivity have been carried out on different soil samples from the tailings dams to look for eventual changes in electrical properties with change in grain size and water content. The electric resistivity survey in the Kristineberg provides a good image of the subsurface resistivity distribution associated with filling materials and water table in the dam. The results of the electrical resistivity survey from 2004 on the Kristineberg tailings dam are fairly similar to those obtained from in 2003. The SP distribution in the dam also reveals that there are no significant changes in SP values from 2003 to 2004. The resistivity from the fixed electrodes indicates a seasonal variation in the apparent resistivity representing the freezing and thawing effect within in the dam. The SP measurements from the fixed electrode at the Kristineberg dam, shows fairly stable values during summer and more unstable during the winter probably due to change in contact resistance. The result from the 2002 SP measurements in the Kiruna dam reveals a general pattern of positive SP values at the downstream side, which is in agreement with the expected result of streaming potentials developed over the dam core. The dam was raised during the summer 2003 and new SP measurements were repeated thereafter during the autumns of 2003 and 2004 in the same areas as for the 2002 measurements. The results from 2003 measurements deviate from 2002 measurements; with in general, more negative potentials along the downstream slope. The potential distribution obtained from the 2004 measurements is compatible with the results obtained before the raising of the dam. The SP data from the fixed electrode shows unsteady physical conditions within the dam after increasing the height of the dam. The apparent resistivity from fixed electrode survey is much influenced by the variations of the pool level of the tailings pond. Some positive SP anomalies on the downstream slope of the IJ-dam at Aitik have been identified that could be related to the seepage through the dam. A distinct positive anomaly at the coordinate 7451330 north that continues to the toe of the downstream slope of the dam is generated from a known seepage of the water. The laboratory measurements on soil samples from the dams reveal a decrease in resistivity as finer particles are added to the samples that contained coarser fractions. Internal erosion may thus be reflected by increase in resistivity. This work has demonstrated the potential of using resistivity and self-potential methods for monitoring the physical condition, and the time changes in the condition of mine tailings dams.Godkänd; 2006; 20070108 (mlk)</p
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
Monitoring of tailings dams with geophysical methods [Elektronisk resurs]
No full textSeveral dam failure accidents have occurred during the last years and mine tailings dam failures are occurring at relatively high rates. Studies of past earth dam failures show embankment dam problems and failures are often related to internal erosion in one way or another. Geophysical methods have the potential of detecting internal erosion processes and anomalous seepage at an early stage of their development. The methods have been tested to monitor and investigate earth dams; however the methods have not been used very much in mine tailings dam. The present study has been conducted to test the applicability of geophysical methods, mainly electrical resistivity and self-potential (SP), for detecting anomalous seepage through mine tailing dams and monitoring the physical condition of the dam. Field measurements of resistivity and self-potential have been performed in the Kiruna, Aitik and Kristineberg tailings dams to look for streaming potentials, inhomogeneities and time variations of electrical properties and self-potentials. SP and resistivity measurements have also been carried out with fixed electrodes in the Kiruna and Kristineberg dam at a roughly monthly interval during one year starting in November 2003 and ending in October 2004. Laboratory measurements of resistivity have been carried out on different soil samples from the tailings dams to look for eventual changes in electrical properties with change in grain size and water content. The electric resistivity survey in the Kristineberg provides a good image of the subsurface resistivity distribution associated with filling materials and water table in the dam. The results of the electrical resistivity survey from 2004 on the Kristineberg tailings dam are fairly similar to those obtained from in 2003. The SP distribution in the dam also reveals that there are no significant changes in SP values from 2003 to 2004. The resistivity from the fixed electrodes indicates a seasonal variation in the apparent resistivity representing the freezing and thawing effect within in the dam. The SP measurements from the fixed electrode at the Kristineberg dam, shows fairly stable values during summer and more unstable during the winter probably due to change in contact resistance. The result from the 2002 SP measurements in the Kiruna dam reveals a general pattern of positive SP values at the downstream side, which is in agreement with the expected result of streaming potentials developed over the dam core. The dam was raised during the summer 2003 and new SP measurements were repeated thereafter during the autumns of 2003 and 2004 in the same areas as for the 2002 measurements. The results from 2003 measurements deviate from 2002 measurements; with in general, more negative potentials along the downstream slope. The potential distribution obtained from the 2004 measurements is compatible with the results obtained before the raising of the dam. The SP data from the fixed electrode shows unsteady physical conditions within the dam after increasing the height of the dam. The apparent resistivity from fixed electrode survey is much influenced by the variations of the pool level of the tailings pond. Some positive SP anomalies on the downstream slope of the IJ-dam at Aitik have been identified that could be related to the seepage through the dam. A distinct positive anomaly at the coordinate 7451330 north that continues to the toe of the downstream slope of the dam is generated from a known seepage of the water. The laboratory measurements on soil samples from the dams reveal a decrease in resistivity as finer particles are added to the samples that contained coarser fractions. Internal erosion may thus be reflected by increase in resistivity. This work has demonstrated the potential of using resistivity and self-potential methods for monitoring the physical condition, and the time changes in the condition of mine tailings dams.</p
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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