1,724,753 research outputs found
Satellite system around the spiral galaxy NGC 5965
No full textWe have constituted a catalog of isolated giant galaxies surrounded by dwarf galaxies. From that catalog we have chosen to study the system of NGC 5965 and its fourteen companion galaxies.We have analysed the structure of the NGC 5965 system and its internal motions by a new statistical deprojection method using pairs of satellites, which allows us to identify a disk structure despite the absence of 3 among 6 phase-space coordinates and to obtain a statistical measurement of its thickness. This method is validated using numerical simulations.We find that eleven among the companion galaxies are, with a high probability, bound satellites lying in a disk-like structure of radius 1 Mpc and thickness Mpc, two are unbound or out of plane and one is probably an interloper at cosmological distance.We have found evidence that NGC 5965, a ( Mpc) distant galaxy, is surrounded by a low thickness disk-like system of satellites whose rotation velocity is constant up to about 200 kpc, then decreases beyond according to a Kepler law, up to 1 Mpc from the main galaxy
Satellite system around the spiral galaxy NGC 5965
No full textWe have constituted a catalog of isolated giant galaxies surrounded by dwarf galaxies. From that catalog we have chosen to study the system of NGC 5965 and its fourteen companion galaxies.We have analysed the structure of the NGC 5965 system and its internal motions by a new statistical deprojection method using pairs of satellites, which allows us to identify a disk structure despite the absence of 3 among 6 phase-space coordinates and to obtain a statistical measurement of its thickness. This method is validated using numerical simulations.We find that eleven among the companion galaxies are, with a high probability, bound satellites lying in a disk-like structure of radius 1 Mpc and thickness Mpc, two are unbound or out of plane and one is probably an interloper at cosmological distance.We have found evidence that NGC 5965, a ( Mpc) distant galaxy, is surrounded by a low thickness disk-like system of satellites whose rotation velocity is constant up to about 200 kpc, then decreases beyond according to a Kepler law, up to 1 Mpc from the main galaxy
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
No full textWe 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
Aplicación del análisis de modo y efecto de falla para controlar el ciclo de minado, Rampa 5965-SE Unidad Minera Yauricocha
No full textLa presente investigación propuso como objetivo general: Establecer la
influencia del análisis de modo y efecto de falla en el control del ciclo de minado de
la rampa 5965 SE, y la hipótesis a contrastar fue: La aplicación del análisis de modo
y efecto de falla de proceso permite el control del ciclo de minado de la rampa 5965
SE mediante el seguimiento constante en base a la detección de fallas en el
proceso, su evaluación y corrección.
El método de investigación general fue el científico, tipo aplicada, nivel
correlacional y de diseño experimental; la población estuvo constituida por las
rampas de desarrollo 5965 SE en el cuerpo Contacto Sur Medio, la muestra no
probabilística; conformada por la rampa 5965 SE, cuerpo Contacto Sur Medio del
nivel 1120 piso 05 en un tramo de 270 metros, unidad minera Yauricocha en la
zona V
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
- …
