1,721,028 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
Aluminosilicate-coated silica sand for reactive transport experiments
Get PDFThesis (Ph.D.), Engineering Science, Washington State Universit
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
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Spatial suitability analysis for site selection of vineyards using biophysical models and computational intelligence
Get PDFThe goal of our study was to develop a comprehensive land-assessment system for grapevine (Vitis vinifera L.) suitability analysis with the ability to spatially incorporate biophysical information from the Pacific Northwest (PNW) region of the United States. The potential for using satellite remote-sensing products for estimating the key phenological metrics of several vineyards located in the Columbia Valley of Washington was first evaluated. Remote sensing products such as Land Surface Temperature (LST) and the Normalized Difference Vegetation Index (NDVI) were also used to estimate the near surface air temperature of the region, which has complex terrain. Our results indicated discrepancies in the bias distribution due to the type of landcover present. During the following phase of our study, daily weather data were obtained from the Gridded Surface Meteorological data-set from the University of Idaho (UI GSM) for a 30-year period (1983-2012). This weather dataset were utilized to compute several bio-climatic indices that were used in turn for characterizing weather dynamics of the American Viticultural Areas (AVA) located within the PNW. Previously established bio-climatic indices were also modified to improve the capture of the underlying weather phenomena of the region, and were then used for the development of the weather component of our land-assessment system. For the edaphic and topographic components of the system, soil data were obtained from the gSSURGO dataset and topographical component data were obtained from the National Elevation Dataset (NED). The potential for grape production in a region can be restricted by many parameters; therefore, land-cover and water rights information were also incorporated into our system. Fuzzy logic rules were used to transform the input parameters in to a common scale and to calculate the vineyard potential for the study area. Finally, our developed land-assessment system was evaluated with a comparison of the vineyard potential of established vineyards. The results of our study has proven that our system can be used as an accurate method to help decision makers, growers, and researchers gain a better understanding of the underlying biophysical parameters that contribute to the potential of various areas of the PNW for wine grape production
Correspondence between the Campbell and van Genuchten Soil-Water-Retention Models
No full textTwo methods are presented that allow converting the van Genuchten (VG) soil-water-retention (SWR) model parameters to equivalent parameters of the Campbell (C) model. The first method builds on an available solution to convert the VG model to an equivalent Brooks-Corey (BC) model, but accounts for the fact that the effective water content of the BC model and the C model are not the same, because the C model lacks the residual water content parameter, θr. The second method (II) relies on a curve-fitting exercise (minimizing the differences between the VG and C-SWR curves) to derive simultaneously the optimal capacity-matching point and SWR-matching point. Results indicate that the second method outperforms the first method and yields an improved equivalence. To bypass the time-consuming curve-fitting exercise, based on Method II two empirical regression equations are presented that allow rapid calculation of the two C-parameters, air-entry and Campbell-b, by the corresponding VG-SWR parameters
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Phosphorus leaching from manure-impacted soils affected by fluctuating water tables
Get PDFDispelling 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
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