1,720,955 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
*WINNER* Effect of levee foundation coefficient of consolidation on the extent of the saturated zone after flooding for rapid drawdown analysis
No full textAs part of a broader research initiative exploring the extent of the saturation zone in levees due to flooding, this study investigates the effects of foundation properties on levee through-seepage. The coefficient of consolidation, cv dictates the response of levee and foundation soils to transient flow conditions and subsequently the extent of saturation in levees. Uncoupled transient seepage analysis from finite element methods was used to estimate parametrically the position of the phreatic surface in levees considering soil coefficient of consolidation, levee geometry and flood hydrograph. The results showed that the extent of the saturated zone for an impervious foundation was similar to that found for levees with cv higher than the foundation cv. The saturated zone tends to have an L-shape when a more pervious foundation is considered. Seepage from the retained water (Zone A) is not significantly affected by the presence of a pervious foundation. On the other hand, Zone B is influenced by the rate of seepage within the foundation and the levee properties. The results indicate that levee foundation conditions have the largest impact on levee through-seepage when the foundation has a higher cv than that of the levee itself. The study develops equations and chart which can be used to make appropriately conservative assumptions about the saturation zone within levees on pervious foundation prior to rapid drawdown. Cases where the levee has a higher cv than the foundation may be analyzed for RDD by assuming an impervious foundation
*WINNER* Unsaturated soil model effects on the propagation of the saturated zone in levees during flooding
No full textDesign of waterside slopes for rapid drawdown typically assumes an initial state of steady seepage prior to drawdown. However, levees built from low permeability soils are unlikely to reach this state during a flood, and a method has been developed to evaluate the degree of seepage propagation based on a linear approximation of the phreatic surface at end of flooding. For impervious foundation conditions, the degree of seepage propagation can be related to a time factor that is a function of the flood hydrograph, the soil coefficient of compressibility, and levee geometry. In addition, the post-flood saturated zone in levees depends on the soil water characteristic curve (SWCC) and hydraulic conductivity function (HCF), which are quite uncertain for unsaturated soils. This study parametrically compares results obtained using the Slide v. 8.0 Simple model to the Fredlund and Xing, and van Genuchten models for SWCC and HCF for levees with different flood, geometric and soil properties. The results show that the type of SWCC and HCF model selected has a significant effect on the predicted degree of seepage propagation, or the start-of-drawdown phreatic surface. For the same set of levee scenarios, the Simple model predicts significantly larger saturated zones within levees compared to those predicted using the Fredlund and Xing, and van Genuchten models. For more realistic assessment of levee seepage, van Genuchten is recommended. However, for cases where unsaturated soil properties are unknown or very uncertain, the Simple model may be appropriate
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
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
- …
