1,721,467 research outputs found
A new combination in Nasa (Loasaceae) from Mesoamerica
No full textAcuña-Castillo, Rafael, Weigend, Maximilian (2023): A new combination in Nasa (Loasaceae) from Mesoamerica. Phytotaxa 598 (2): 182-184, DOI: 10.11646/phytotaxa.598.2.8, URL: http://dx.doi.org/10.11646/phytotaxa.598.2.
Historia universal
Get PDFObra ilustrada con cromo-litografías, grabados en acero y boj, mapas, etc.Copia digital. España : Ministerio de Cultura. Subdirección General de Coordinación Bibliotecaria, d2024Rústica, deteriorada.Palau, III, 123, 42743, supone impreso el Tomo I en 1881.Registro de la Propiedad Intelectual: Ley de 1847: [sin número]; firma del depositante: "J. Luis Fraga"Sello: "Universidad Central, Artes y oficios, Biblioteca
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
Étude exploratoire des interactions mentales des étudiants de sixième sur la compréhension du concept de multiplication
No full textThis article presents the results of the investigation with the purpose of exploring how sixth-grade, high-school students built or interiorized the concept of multiplication from the beginning of their schooling up until present day.How to reference this article: FIGUEROA MOLINA, Roberto; UTRIA ECHEVERRÍA, Carlos; COLPAS CASTILLO, Rafael y ARAUJO PEREIRA, Antonio, “Estudio exploratorio de las interacciones mentales de los estudiantes de sexto grado sobre el entendimiento del concepto multiplicación”, Revista Educación y Pedagogía, Medellín, Universidad de Antioquia, Facultad de Educación, vol. XVII, núm. 43, (septiembre-diciembre), 2005, pp. 111-124.Received: september 2005Accepted: december 2005Este artículo presenta los resultados de la investigación cuyo propósito consistió en explorar cómo los estudiantes de sexto grado de bachillerato construyen o interiorizan el concepto multiplicación desde los inicios de su educación formal hasta la que actualmente poseen.Cómo citar este artículo: FIGUEROA MOLINA, Roberto; UTRIA ECHEVERRÍA, Carlos; COLPAS CASTILLO, Rafael y ARAUJO PEREIRA, Antonio, “Estudio exploratorio de las interacciones mentales de los estudiantes de sexto grado sobre el entendimiento del concepto multiplicación”, Revista Educación y Pedagogía, Medellín, Universidad de Antioquia, Facultad de Educación, vol. XVII, núm. 43, (septiembre-diciembre), 2005, pp. 111-124.Recibido: septiembre 2005Aceptado: diciembre 2005Cet article présente les résultats de la recherche dont le but consistait à explorer comment les étudiants de la sixième année du baccalauréat colombien construisent ou intériorisent le concept de multiplication depuis les débuts de leur éducation formelle jusqu'à ce qu'ils possèdent actuellement
3D bioprinted muscle-based bio-actuators: Force adaptability due to training
No full textThe integration of biological tissue and artificial materials plays a fundamental role in the development of biohybrid soft robotics, a subfield in the field of soft robotics trying to achieve a higher degree of complexity by taking advantage of the exceptional capabilities of biological systems, like self-healing or responsiveness to external stimuli. In this work, we present a proof-of-concept 3D bioprinted bio-actuator made of skeletal muscle tissue and PDMS, which can act as a force measuring platform. The 3D bioprinting technique, which has not been used for the development of bio-actuators, offers unique versatility by allowing a simple, biocompatible and fast fabrication of hybrid multi-component systems. Furthermore, we prove controllability of contractions and functionality of the bio-actuator after applying electric pulses by measuring the exerted forces. We observe an increased force output in time, suggesting improved maturation of the tissue, opening up possibilities for force adaptability or modulation due to prolonged electrical stimuli
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