1,720,960 research outputs found
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
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
Electrochemically Precipitated Struvite Effects on Soil Property and Crop Response
Full text linkPhosphorus (P) is a vital resource that is finite and only mineable in raw-material form in a few countries worldwide. Struvite (MgNH4PO4·6H2O) is a mineral that can be produced from wastewater that may provide a promising alternative source of fertilizer-P for crop production, but comprehensive characterizations of struvite behavior in various soils and responses of various crops are necessary. This study aimed to determine the (1) leaching potential, (2) vertical soil profile-P distribution, (3) wheat (Triticum aestivum), corn (Zea mays), and soybean (Glycine max) response, and (4) soil property changes over time of electrochemically precipitated struvite (ECST) compared to that of chemically precipitated struvite (CPST), monoammonium phosphate (MAP), triple superphosphate (TSP), and an amended control (UC) in loam (L), silt loam (SiL), silty clay loam (SiCL), and sandy loam (SL) soils from Arkansas (AR-L, -SiCL, and -SiL), Missouri (MO-SiL 1 and 2), and Nebraska (NE-SiL and -SL). Leachate properties differed (P \u3c 0.05) from their UC among soils and fertilizer-P sources over time. Leachate pH differed among soils, ranging from a change of 0.1 to 1.0, while water-soluble (WS)-P also differed (P \u3c 0.05) among soil-fertilizer-P-source-time combinations, but only in the AR-L, where TSP (2.0 to 6.6 mg L-1) consistently had larger WS-P difference than ECST (-0.04 to 3.1 mg L-1) in weeks 1 to 3. Vertical soil profile WS-P concentrations from the two struvite’s generally did not differ (P \u3e 0.05) and were similar to that of MAP, but greater than for TSP in the top 6 cm in four of the six soils. For all three crops, more than 50 % of the 35 plant properties per crop differed (P \u3c 0.05) among fertilizer-P sources within soils, while the other plant properties differed among soils or among fertilizer-P sources. Wheat, corn, and soybean dry matter (DM) response to ECST across crops and soils was complex. However, crop response from ECST was generally similar or greater than for CPST, MAP, TSP, and the UC across all soils, except for belowground wheat DM in the AR-SiL and MO-SiL 2. Similarly, the ECST had similar or larger tissue nutrient concentrations and uptakes to that for CPST, MAP, TSP, and the UC. Aboveground nitrogen (N), -P, and -magnesium (Mg) tissue concentrations and uptakes from ECST were generally similar to that for all soil-fertilizer-P source combinations. All but one (i.e., WS-Mg) parameter differed (P \u3c 0.05) among fertilizer-P sources within soils over time in a soil-incubation study. Soil-fertilizer combinations generally had an acidifying effect over time. Water-soluble soil-P change relative to the initial for ECST was generally similar or larger than for the other fertilizer-P sources. Results show that the use of recovered struvite materials as a fertilizer-P source has significant potential for a wide range of crops, while being environmentally protective, meaning recovered from wastewater and only partially soluble in water allowing for greater soil retention than MAP and TSP, thus reducing the risk of eutrophication in surface waters or P-loss through leaching. Further research is needed to fully understand the plant response to struvite use as a fertilizer-P source and the effects of its long-term use on soil properties and microbial communities, but the results so far are promising
Electrochemically Precipitated Struvite Effects on Soil Property and Crop Response
Full text linkPhosphorus (P) is a vital resource that is finite and only mineable in raw-material form in a few countries worldwide. Struvite (MgNH4PO4·6H2O) is a mineral that can be produced from wastewater that may provide a promising alternative source of fertilizer-P for crop production, but comprehensive characterizations of struvite behavior in various soils and responses of various crops are necessary. This study aimed to determine the (1) leaching potential, (2) vertical soil profile-P distribution, (3) wheat (Triticum aestivum), corn (Zea mays), and soybean (Glycine max) response, and (4) soil property changes over time of electrochemically precipitated struvite (ECST) compared to that of chemically precipitated struvite (CPST), monoammonium phosphate (MAP), triple superphosphate (TSP), and an amended control (UC) in loam (L), silt loam (SiL), silty clay loam (SiCL), and sandy loam (SL) soils from Arkansas (AR-L, -SiCL, and -SiL), Missouri (MO-SiL 1 and 2), and Nebraska (NE-SiL and -SL). Leachate properties differed (P \u3c 0.05) from their UC among soils and fertilizer-P sources over time. Leachate pH differed among soils, ranging from a change of 0.1 to 1.0, while water-soluble (WS)-P also differed (P \u3c 0.05) among soil-fertilizer-P-source-time combinations, but only in the AR-L, where TSP (2.0 to 6.6 mg L-1) consistently had larger WS-P difference than ECST (-0.04 to 3.1 mg L-1) in weeks 1 to 3. Vertical soil profile WS-P concentrations from the two struvite’s generally did not differ (P \u3e 0.05) and were similar to that of MAP, but greater than for TSP in the top 6 cm in four of the six soils. For all three crops, more than 50 % of the 35 plant properties per crop differed (P \u3c 0.05) among fertilizer-P sources within soils, while the other plant properties differed among soils or among fertilizer-P sources. Wheat, corn, and soybean dry matter (DM) response to ECST across crops and soils was complex. However, crop response from ECST was generally similar or greater than for CPST, MAP, TSP, and the UC across all soils, except for belowground wheat DM in the AR-SiL and MO-SiL 2. Similarly, the ECST had similar or larger tissue nutrient concentrations and uptakes to that for CPST, MAP, TSP, and the UC. Aboveground nitrogen (N), -P, and -magnesium (Mg) tissue concentrations and uptakes from ECST were generally similar to that for all soil-fertilizer-P source combinations. All but one (i.e., WS-Mg) parameter differed (P \u3c 0.05) among fertilizer-P sources within soils over time in a soil-incubation study. Soil-fertilizer combinations generally had an acidifying effect over time. Water-soluble soil-P change relative to the initial for ECST was generally similar or larger than for the other fertilizer-P sources. Results show that the use of recovered struvite materials as a fertilizer-P source has significant potential for a wide range of crops, while being environmentally protective, meaning recovered from wastewater and only partially soluble in water allowing for greater soil retention than MAP and TSP, thus reducing the risk of eutrophication in surface waters or P-loss through leaching. Further research is needed to fully understand the plant response to struvite use as a fertilizer-P source and the effects of its long-term use on soil properties and microbial communities, but the results so far are promising
Dispelling 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
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
- …
