1,721,206 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
Potential Use of Wollastonite as a Filler in UF Resin Based Medium-Density Fiberboard (MDF)
No full textUrea-formaldehyde (UF) resins are primary petroleum-based, increasing their potential environmental footprint. Identifying additives to reduce the total amount of resin needed without adversely affecting the panel properties could reduce these impacts. Wollastonite is a mineral containing calcium and silica that has been used as an additive in a variety of materials and may be useful as a resin extender. Nanoscale wollastonite has been shown to enhance the panel properties but is costly. Micron-scale wollastonite may be a less costly alternative. Medium-density fiberboards were produced by blending a hardwood furnish with UF alone, micron-sized wollastonite alone, or a 9:1 ratio of UF to wollastonite. Panels containing of only wollastonite had poor properties, but the properties of panels with 9:1 UF/wollastonite were similar to the UF-alone panels, except for the internal bond strength. The results suggest that small amounts of micron-sized wollastonite could serve as a resin extender. Further studies are suggested to determine if the micron-sized material has similar positive effects on the resin curing rate
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
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Biology of the carpenter ants Camponotus vicinus (Mayr) and Camponotus modoc (Wheeler) in western Oregon
Full text linkPest control operators in Oregon were surveyed to examine the occurrence of carpenter ants and other wood destroying organisms in structures. Carpenter ants frequently occurred in the coast and Willamette valley regions of the state and were associated with wetter, mesic habitats. To examine the effects of substrate and moisture on Camponotus vicinus and Camponotus modoc, I exposed inseminated queen ants to various substrates at differing humidities and exposed queens ants to a series of humidities. Camponotus vicinus intiated significantly more colonies in drier conditions than C. modoc. Camponotus vicinus also lived longer at lower humidities than C. modoc. Neither ant species could rear offspring in western redcedar. A survey of the yeasts associated with Camponotus vicinus revealed the yeast Debaryomyces polymorphus was frequently found in the buccal cavity and in colonies of these ants at two different locations. To examine the effects of exposure to this yeast on larval development in C. vicinus, I developed an artificial diet for this ant and tested this diet and variations of it on small satellite colonies of ants and larvae. Some of the artificial diets significantly affected larval development. Exposure of the small colonies and larvae to D. polymorphus showed that the yeast effected growth of some colonies fed deficient diets. Ants fed diets lacking B vitamins and cholesterol had heavier pupae and brood when exposed to live yeast than those not exposed
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The role of lytic enzymes in biocontrol of sapstain fungi
Full text linkThe biocontrol potential of Trichoderma harzianum strains
B-2A, B-8A, B-4B, B-15B, and B-41 and Serratia plymuthica was
evaluated using agar plates and wood wafers of unseasoned
ponderosa pine (Pinus ponderosa laws). All five isolates of
Trichoderma harzianum and Serratia plymuthica could inhibit
stain fungi growth in agar plates and exhibited bioprotectant
potential against sapstain fungi on wood wafers.
The production of chitinase and protease related to the
breakdown of stain fungal cell walls was studied in liquid media
and wood wafer cultures for test bioprotectants. Higher
chitinase activity was obtained in chitin-containing media.
Although the synthesis of chitinase was repressed by simple
carbon substrates in liquid media, chitinase activity was still
detected on wood wafer cultures when the bioprotectant was
pregrown on media containing these same carbon sources. No
protease activity was detected in liquid cultures, but protease activities were detected on wood wafer cultures.
The relationship between biocontrol performance and lytic
enzyme activities was evaluated using mixed cultures of
bioprotectants and stain fungi on wood wafers. Generally, fungal
stain inhibition increased with increases in chitinase.
Increasing chitinase activity above about 0.08 uU/m1 had a
minimal effect on fungal stain inhibition. Further statistical
analysis indicated that biocontrol efficacy appeared to be
related to LOG (chitinase activity) but not to LOG (protease
activity). No synergistic effects were found between protease
and chitinase in biocontrol of sapstain fungi.
The mechanisms for the biocontrol of sapstain fungi were
further studied using living bioprotectant cells and its
sterilized filtrate. Live cells effectively prevented
discoloration of wood wafers , while the filtrates generally
failed to inhibit stain fungi growth in wood wafers over a 4-
week incubation. Purified chitinase of Streptomyces griseus
partially inhibited spore germination of Ulocadium chartarum,
but varied with chitinase source. No inhibition of U. chartarum
spore germination occurred after treatment with purified
protease
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