1,721,992 research outputs found
Vegetative growth of two mulberry species (Morus multicaulis and M. alba) under greenhouse and field conditions
Get PDFMorus alba and Morus multicaulis, common ornamental species in Chile, were studied regarding their growth and dry matter production. In Santiago (Metropolitan Region), plants from vegetative propagation, one part growing under field conditions and the other in a plastic greenhouse were used; both with similar soil, water availability and cutting system (0.20 and 0.40 m). Periodically, four shoots per selected plant were measured for length, number of leaves and dry weight. Previously, a correlation between dry matter and foliar size (length, width, area) of each species was established to estimate the latter. Correlation coefficients obtained had a R2 higher than 0.60 whereas the length and width used to estimate foliar area had an R2 of 0.96 to M. multicaulis and 0.95 to M. alba when correlated to the real area measured. The growth curve for total weight was superior for M. multicaulis at the beginning, but at the end was greatest for M. alba. In the greenhouse there were more leaves per shoot in M. alba, and there were no differences between species in the field. The shoot length changed with environmental conditions, as it was better with M. alba in the greenhouse and with M. multicaulis in the field. It was concluded that M. alba is more sensitive to the temperature regimes used in this study
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
Vegetative growth of two mulberry species (Morus multicaulis and M. alba) under greenhouse and field conditions
No full textMorus alba and Morus multicaulis, common ornamental species in Chile, were studied regarding their growth and dry matter production. In Santiago (Metropolitan Region), plants from vegetative propagation, one part growing under field conditions and the other in a plastic greenhouse were used; both with similar soil, water availability and cutting system (0.20 and 0.40 m). Periodically, four shoots per selected plant were measured for length, number of leaves and dry weight. Previously, a correlation between dry matter and foliar size (length, width, area) of each species was established to estimate the latter. Correlation coefficients obtained had a R² higher than 0.60 whereas the length and width used to estimate foliar area had an R² of 0.96 to M. multicaulis and 0.95 to M. alba when correlated to the real area measured. The growth curve for total weight was superior for M. multicaulis at the beginning, but at the end was greatest for M. alba. In the greenhouse there were more leaves per shoot in M. alba, and there were no differences between species in the field. The shoot length changed with environmental conditions, as it was better with M. alba in the greenhouse and with M. multicaulis in the field. It was concluded that M. alba is more sensitive to the temperature regimes used in this study.En Morus alba y M. multicaulis, especies ornamentales comunes en Chile, se estudió su crecimiento y productividad en dos ambientes. Se trabajó en la Región Metropolitana, con plantas propagadas vegetativamente, la mitad plantada dentro de un invernadero de polietileno y la otra en ambiente natural, ambas con condiciones de suelo, disponibilidad de agua y sistema de corte (0,20 y 0,40 m) similares. Se midió periódicamente en cuatro brotes marcados por planta: el largo de éstos, el número de hojas formadas y su peso seco. Previamente se estableció una correlación entre el peso seco y el tamaño foliar (largo, ancho, área), en cada especie, con el fin de usar alguno de estos parámetros para estimar la materia seca. Los coeficientes de correlación obtenidos mostraron un R² superior a 0,60, por lo que se usó el largo y ancho, para estimar el área de hoja, y al correlacionar el área calculada con el área real medida se obtuvo 0,96 y 0,95, para M. multicaulis y M. alba, respectivamente. La curva de crecimiento en función del peso total por planta así estimado fue inicialmente superior enM. multicaulis, pero avanzada la estación, fue mayor enM. alba. En condiciones de invernadero se obtuvo una mayor cantidad de hojas formadas por brote para M. alba, y no se obtuvo diferencias entre ambas especies en el exterior. El largo de los brotes difiere en cuanto a la mejor condición ambiental para su crecimiento, que es el invernadero para M. alba y el exterior para M. multicaulis. Se concluye que M. alba es más sensible a los regímenes térmicos con que se trabajó
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
Survival rate analyses of <i>M. alba</i> in 2012 planted in the Xiaohe village WLFZ.
No full text<p>ND, not determined.</p><p>Survival rate analyses of <i>M. alba</i> in 2012 planted in the Xiaohe village WLFZ.</p
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
M-ALBA: A modelling framework to guide the optimization of membrane-assisted algae-bacteria systems
No full textInternational audienceThe M-ALBA model represents membrane-algae-bacteria photobioreactors.• Biomass retention increases biomass respiration rate, reducing algal productivity.• High SRT promotes retention of nitrifying bacteria enabling total nitrification. • Biomass retention increases treatment yield and reduces required area.</div
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