1,723,084 research outputs found
Seasonality of Growth in Grass-Clover Swards Under Repetitive Nitrogen Application
Full text linkThe cohabitation of grass and clover is possibly due to asynchrony in their growth patterns, and to the beneficial effects of fixed nitrogen (N) on grass. Incompatibility of clover persistence with N fertilisation has been frequently reported (Nassiri and Elgersma, 2002). However, limited information is available regarding the effect of repetitive application of N in mixed swards. This research aims to study the balance between species in response to application of increasing rates of N throughout the growing season
Scour downstream of rock-lined stilling basins
No full textLocal scour downstreams of a stilling basin with hydraulic jump has been investigated experimentally in the laboratory. The studies embraced both a smooth and a rock-lined bed to the stilling basin. Two rock sizes were used (22mm and 13mm median diameter). Three different sizes of sand (0.35mm, 0.5mm and 1.00mm median diameter) were used in the channel downstream.Tests were conducted to establish the hydraulic characteristics of the rock-lined stilling basin and the effect of scour development on the momentum balance of the jump also to determine the effect of rock size on the scour profile.Empirical equations based on the experimental data have been developed. The logarithmic law was found to be valid for velocity distribution, friction factor and Chezy coefficient. Equivalent sand roughness of the rock was found equal to 0.2 times the characteristic size of the rock.The momentum balance describing the formation of the hydraulic jump for a rigid boundary was adapted to define the formation of the hydraulic jump in the presence of the scour development.The characteristic features of the scoured bed in the equilibrium state have been analysed using dimensional analysis. It has been found that the dimensionless shape of the scour hole can be defined by a general equation. The maximum depth of scour and its distance from the downstream end of the stilling basin in terms of supercritical depth of flow have been found to vary with super-critical Froude number and roughness height.The investigation has shown that scour depth is much reduced downstream of rock-lined stilling basin as compared with a smooth lining. The average reduction of scour depth was about 33% and 18% for 22mm and 13mm rock, respectively. Correspondingly, the distance to the maximum scour depth was increased by about 40% and 15%, respectively. (D81693)</p
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
Finite information limit variance-covariance structures: Is the entire dataset needed for analysis?
No full textFinite Information Limit (FIL) variance-covariance structures for hierarchical data are introduced and examined: for such data, it is often possible to analyze only a sometimes very small subset, leading to considerable computation time gain, with almost no efficiency loss. A central example is compound-symmetry. A simple approach is proposed to detect this property in a given dataset
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
Resurgence of Urgent-Start Peritoneal Dialysis in COVID-19 and Its Application to Advanced Heart Failure
Full text linkDispelling 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
Décalé XI: City-fiction in Smoke and Steam
No full textDécalé XI: City-fiction in Smoke and Steam (Ormside Projects, London, 21 November 2024) presented an evening of experimental sound, moving image, and live performance exploring the intersections of urban landscape, fiction, ritual, and sonic futurity. The programme included new and existing works by Ashley Holmes & Jamal Sterrett (scored improv movement), Arash Nassiri & Saint Abdullah (Sound sculpture & scored expanded-cinema), Flora Yin-Wong (AV live set), Edmund Hardy (sci-fi poetry), Olukemi Lijadu (cinematic sonic portraits), and Chooc Ly (astral soundscape).
Curated by Chooc Ly Tan, Kadeem Oak, and Leïla Arenou, Décalé XI was supported by Fluxus Art Projects and Arts Council England. As part of the ongoing Décalé series, the event highlights the platform’s commitment to amplifying marginalised voices through interdisciplinary formats spanning sound, performance, moving image, and collective reflection
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