1,720,983 research outputs found
Effects of supplementary lighting and bending technique on growth, flowering and carbohydrate status of Rosa hybrida 'Frisco'
No full textThe effect of 2 supplementary lighting regimes (30 and 60 mu mol/m(2).s) and 2 cultural techniques (bending or decapitation) on the development of the new stems, dry-matter distribution and carbohydrate content of Rosa hybrida 'Frisco' plants was evaluated. Experiments were performed with single shoot rooted cuttings in a greenhouse compartment. Plants were grown at 18/16 degrees C day/night temperature and received a photoperiod of 18 hours. At each light level (30 and 60 mu mol/m(2).s) plants were randomly split in two groups depending on the harvesting technique. The primary shoot was either decapitated above the two most basal leaves with five leaflets or bended. Development of two shoots per plant was allowed. The analysis were performed on those two emerging shoots. The experiment was performed from January until March 1996, and was repeated for the decapitation treatment only, from March until May 1996.
Bending of the primary shoot resulted in significant longer stems and increased flower stem weight and flower stem diameter with no effect of the supplementary lighting on the flower stem quality at harvest. For decapitated plants, however, a supplementary lighting of 60 mu mol/m(2).s reduced significantly the percentage of flower abortion, increased the flower stem development rate and the flower stem weight in comparison with 30 mu mol/m(2).s.
The bending technique, in comparison to the decapitation method, results in faster shoot growth rate associated to higher glucose and fructose concentration in the apical part of the stem during the differentiation of the flower primordia and the shoot elongation phase
New Stability Theorems for Averaging and Their Application to Convergence Analysis of Adaptive Identification and Control Schemes
No full textRobust Parametric Identification of Sinusoidal Signals: an Input-to-State Stability Approach
No full text
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
Analysis of Adaptive Identifiers in the Presence of Unmodelled Dynamics: Averaging and Tuned Parameters
No full textDispelling 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
- …
