1,720,963 research outputs found
Physical and chemical soil parameters and the number of individuals of the collembolan families [DATASET]
No full textFil: Sandler, Rosana Verónica. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina.Fil: Falco, Liliana Beatriz. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina.Fil: Di Ciocco, César Augusto. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina.Fil: Castro Huerta, Ricardo Andrés. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina.Fil: Saravia, Leonardo Ariel. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina.Fil: Coviella, Carlos Eduardo. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina.The database contains information about physical and chemical soil parameters, as well as the number of individuals of the collembolan families present in each sample.
Samples were taken from the same Argiudol soil in Buenos Aires province, Argentina, under three different levels anthropic impact: Natural grassland system (NG), Cattle grazing system (CG) and Intensive agriculture system (AG). Three replicates from each system were taken from each system at eight sampling dates over a two-year period.
For more information see:
Sandler, Rosana V., Liliana B. Falco, César A. Di Ciocco, Ricardo Castro Huerta, Leonardo A. Saravia, Carlos E. Coviella. 2018. Change of collembolan (Hexapoda: Collembola) community structure related to anthropic soil disturbance. Revista de la FCA UNCuyo 50(1): 217-231. Online: http://revista.fca.uncu.edu.ar/images/stories/pdfs/2018-01/Cp_15_Coviella.pd
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
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
Cambio de la estructura de la comunidad de colémbolos (Hexapoda: Collembola) en relación con el disturbio antrópico de los suelos
Get PDFIn order to evaluate the effects of the anthropic impact on the structure of de soil
collembolan community, three different soil uses were researched: agricultural fields (AG)
with 50 years of continuous farming, pastures entering the agricultural cycle (CG),
and naturalized grasslands (NG). The study was carried out in fields of Chivilcoy
(34°53'49 S, 60°01'09 W, elev. 60 m) and Navarro (34°51’30 S, 59°12’25 W, elev. 43 m),
Buenos Aires Province, Argentina. For each of the three uses, three fields were selected
as replicates, with three soil samples per replicate and sample date (10) for a total of 216
samples analyzed. Collembolans (Hexapoda: Collembola) were extracted and identified
to family level. Five families were found: Hypogastruridae, Onychiuridae, Isotomidae,
Entomobryidae, and Katiannidae. Soils were also characterized by means of physical
and chemical analyses. The index of degree of change of collembolan diversity was calculated
with the biological data. The results show that the biological index of degree of
change can detect soil use effects on the collembolan community. Somewhat surprisingly,
the index showed that the diversity of collembolans was higher in the high anthropic
impact site AG, followed by CG and lowest in NG. The results also show that collembolan
families respond differently to soil use. The families Hypogastruridae, Onychiuridae, and
Isotomidae presented differences between systems. Therefore, collembolan community
structure can be a useful tool to assess agricultural practices´ impacts on soil.Con el objetivo de evaluar el efecto que produce el impacto antrópico sobre la
estructura de la comunidad de colémbolos, tres usos diferentes del suelo fueron investigados:
campos de agricultura (AG) con 50 años de agricultura continua, pasturas
ingresando al ciclo agrícola (CG) y campos naturalizados (NG). El estudio fue llevado
a cabo en campos de los partidos de Chivilcoy (34°53'49 S, 60°01'09 W, elev. 60 m) y
Navarro de la provincia de Buenos Aires, Argentina. Para cada uno de los tres usos del
suelo, tres campos fueron seleccionados como réplicas. Cada muestreo consistió en
tres muestras de suelo por réplica y por fecha de muestreo (10) para un total de 216
muestras recolectadas y analizadas. Los colémbolos fueron extraídos de las muestras
e identificados a nivel de familia. Se identificaron cinco familias: Hypogastruridae,
Onychiuridae, Isotomidae, Entomobryidae y Katiannidae. Los suelos fueron además
caracterizados mediante análisis físicos y químicos. Con los datos biológicos se calculó
el índice de grado de cambio de la diversidad de colémbolos. Los resultados muestran
que el índice biológico del grado de cambio puede detectar los efectos del uso del suelo
sobre la comunidad de colémbolos. Sorpresivamente, el índice muestra que la diversidad
de colémbolos medida a través del índice de grado de cambio es más alta en los
sitios de mayor impacto antrópico (AG), seguido de CG y la menor diversidad en el sitio
de menor impacto (NG). Los resultados muestran además que las familias de colémbolos
responden de manera diferente al uso del suelo. Las familias Hypogastruridae,
Onychiuridae e Isotomidae presentaron diferencias entre los usos. En consecuencia, la
estructura de la comunidad de colémbolos puede ser una herramienta útil para evaluar
el impacto en el suelo de las prácticas agrícolas.Fil: Sandler, Rosana Veronica.
Universidad Nacional de LujánFil: Falco, Liliana B..
Universidad Nacional de LujánFil: Di Ciocco, César A..
Universidad Nacional de LujánFil: Castro Huerta, Ricardo.
Universidad Nacional de LujánFil: Coviella, Carlos E..
Universidad Nacional de Lujá
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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