1,720,984 research outputs found
Lightcurve analysis of 918 itha and 2008 Konstitutsiya
Get PDFPhotometric studies of 918 Itha and 2008 Konstitutsiyawere made in collaboration with observers in Australia and Argentina. The large geographic longitudinal differences between the two locations helped provide aunique solution for the synodic period for both asteroids: 918 Itha, 3.47393 ± 0.00006 h; 2008 Konstitutsiya11.2692 ± 0.0004 h.Fil: Oey, Julian. Kingsgrove Observatory; AustraliaFil: Colazo, Carlos Roberto. Observatorio El Gato; ArgentinaFil: Mazzone, Fernando Dario. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas, Fisicoquímicas y Naturales. Departamento de Matemática; ArgentinaFil: Chapman, Andrés. Observatorio Cruz del Sur; Argentin
Lightcurve analysis of 918 itha and 2008 Konstitutsiya
Get PDFPhotometric studies of 918 Itha and 2008 Konstitutsiyawere made in collaboration with observers in Australia and Argentina. The large geographic longitudinal differences between the two locations helped provide aunique solution for the synodic period for both asteroids: 918 Itha, 3.47393 ± 0.00006 h; 2008 Konstitutsiya11.2692 ± 0.0004 h.Fil: Oey, Julian. Kingsgrove Observatory; AustraliaFil: Colazo, Carlos Roberto. Observatorio El Gato; ArgentinaFil: Mazzone, Fernando Dario. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas, Fisicoquímicas y Naturales. Departamento de Matemática; ArgentinaFil: Chapman, Andrés. Observatorio Cruz del Sur; Argentin
Collaborative Asteroid Photometry and Lightcurve Analysis at Observatories OAEGG, OAC, EABA, and OAS
Get PDFSynodic rotation periods and amplitudes are reported for: 1874 Kacivelia, 15.951 ± 0.001 h, 0.21 ± 0.02 mag; 2055 Dvorak, 4.4052 ± 0.0003 h, 0.17 ± 0.04 mag; 2185
Guangdong, 21.089 ± 0.002 h, 0.19 ± 0.02 mag; and 8059 Deliyannis, 6.0041 ± 0.0003 h, 0.39 ± 0.04 mag. The absolute magnitude (H) and/or slope parameter (G)
for some of these asteroids are also reported.Fil: Mazzone, Fernando Dario. Universidad Nacional de Río Cuarto; Argentina. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Colazo, Carlos Roberto. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; ArgentinaFil: Mina, Federico. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; ArgentinaFil: Melia, Raúl. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; ArgentinaFil: Spagnotto, Julio. Observatorio El Catalejo; ArgentinaFil: Bernal, Alejandro. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentin
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
A WIDE-FIELD SURVEY FOR TRANSITING HOT JUPITERS AND ECLIPSING PRE-MAIN-SEQUENCE BINARIES IN YOUNG STELLAR ASSOCIATIONS
Get PDFThe past two decades have seen a significant advancement in the detection, classification, and understanding of exoplanets and binaries. This is due, in large part, to the increase in use of small-aperture telescopes (<20 cm) to survey large areas of the sky to milli-mag precision with rapid cadence. The vast majority of the planetary and binary systems studied to date consists of main-sequence or evolved objects, leading to a dearth of knowledge of properties at early times (<50 Myr). Only a dozen binaries and one candidate transiting Hot Jupiter are known among pre-main-sequence objects, yet these are the systems that can provide the best constraints on stellar formation and planetary migration models. The deficiency in the number of well characterized systems is driven by the inherent and aperiodic variability found in pre-main-sequence objects, which can mask and mimic eclipse signals. Hence, a dramatic increase in the number of young systems with high-quality observations is highly desirable to guide further theoretical developments. We have recently completed a photometric survey of three nearby (<150 pc) and young (<50 Myr) moving groups with a small-aperture telescope. While our survey reached the requisite photometric precision, the temporal coverage was insufficient to detect Hot Jupiters. Nevertheless, we discovered 346 pre-main-sequence binary candidates, including 74 high-priority objects for further study.Fil: Oelkers, Ryan J.. Vanderbilt University; Estados Unidos. Texas A&M University; Estados UnidosFil: Macri, Lucas M.. Texas A&M University; Estados UnidosFil: Marshall, Jennifer L.. Texas A&M University; Estados UnidosFil: Depoy, Darren L.. Texas A&M University; Estados UnidosFil: Garcia Lambas, Diego Rodolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; ArgentinaFil: Colazo, Carlos Roberto. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; ArgentinaFil: Stringer, Katelyn. Texas A&M University; Estados Unidos. Middle Tennessee State University; Estados Unido
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