1,721,074 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
Photosynthesis in Ranunculus asiaticus L.: characterization in two Mediterranean hybrids under fluorescent white light
No full textRanunculus asiaticus L. is a quantitative long-day species, originating from Mediterranean area, grown in cold greenhouse for cut flowers and potted plants. Flowering in ranunculus is a complex process, strongly steered by the temperature and the photoperiod. Vernalization of rehydrated tuberous roots, used as propagation material, anticipates sprouting and leaf rosette formation and flowering. It is known that the time for flowering and the sensitivity to cold treatment vary in the numerous commercial hybrids, while no information seems to be available on the influence of vernalization on the photosynthetic process.
The aim of the experiment was to investigate the influence of two hybrids, MDR (medium earliness) and MBO (early flowering), and two preparation treatments of tuberous roots, only rehydration (Control, C) and rehydration plus vernalisation (V), on photosynthesis and photochemistry and photosynthetic pigments content in plants grown in pot in growth chamber, under controlled environment.
In control plants, photosynthesis was higher in MDR-C than in MBO-C, while the maximal PSII photochemical efficiency (Fv/Fm) slightly decreased in the first hybrid. MBO-C developed more leaves and a consequent higher plant leaf area.
Compared to only rehydration, vernalization of rehydrated tuberous roots increased the number of leaves and the plant leaf area in both the hybrids. The preparation treatment did not affect photosynthetic rate while it decreased the maximal PSII photochemical efficiency (Fv/Fm) in both the hybrids. A significant interaction was found between the hybrid and the preparation treatment in the content of photosynthetic pigments, which decreased in plants from vernalized tuberous roots compared to those from only rehydrated roots in MDR, while increased with vernalization in MBO
WEALTHY, A Wearable Health-Care System: New frontier on E-Textile
No full textA comfortable health monitoring system named
WEALTHY is presented. The system is based on a wearable
interface implemented by integrating fabric sensors, advanced
signal processing techniques and modern telecommunication
systems, on a textile platform. Conducting and piezoresistive
materials in form of fibre and yarn are integrated in a gar-
ment and used as sensors, connectors and electrode elements.
Simultaneous recording of vital signs allows extrapolation
of more complex parameters and inter-signal elaboration that
contribute to produce alert messages and patient table. The
purpose of this publication is to evaluate the performance
of the textile platform and the possibility of the simultane-
ous acquisition of several biomedical signals
An exact solution framework for multitrip vehicle-routing problems with time windows
Full text linkMultitrip vehicle-routing problems (MTVRPs) generalize the well-known VRP by allowing vehicles to perform multiple trips per day. MTVRPs have received a lot of attention lately because of their relevance in real-life applications - for example, in city logistics and last-mile delivery. Several variants of the MTVRP have been investigated in the literature, and a number of exact methods have been proposed. Nevertheless, the computational results currently available suggest that MTVRPs with different side constraints require ad hoc formulations and solution methods to be solved. Moreover, solving instances with just 25 customers can be out of reach for such solution methods. In this paper, we proposed an exact solution framework to address four different MTVRPs proposed in the literature. The exact solution framework is based on a novel formulation that has an exponential number of variables and constraints. It relies on column generation, column enumeration, and cutting plane. We show that this solution framework can solve instances with up to 50 customers of four MTVRP variants and outperforms the state-of-the-art methods from the literature
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