1,721,001 research outputs found
Abundance variation of Porichthys margaritatus (Pisces: Batrachoididae) throughout thermic and bathymetric gradients in the central Mexican Pacific
No full textThree cruises, one in cach of the main stream patterns in the area, were made on the central Mexican Pacific continental slope (May-June 1995, November 1995, and March 1996). Seven trawl sampling sites were defined per cruise, and in each site four bathymetric levels were sampled (20, 40, 60, and 80 m). During the warmest seasons, the highest abundance of Porichthys margaritatus was at 60 m. When the temperature of the bottom water was lower, in March 1996, the highest abundance of P. margaritatus moved towards 40 m. The depths with greatest abundance fluctuated between 18 and 21°C, indicating a narrow temperature preference range. A Gaussian model was used to explain the relation between abundance and temperatura.Se analizaron tres cruceros de pesca demersal, uno por cada pauta principal de circulación marina en la zona (mayo-junio de 1995, noviembre de 1995, y marzo de 1996). Se determinaron siete sitios de muestreo en cada crucero y en cada sitio se muestrearon cuatro estratos batimétricos (20,40, 60 y 80 m). Durante la época cálida, las mayores abundancias de Porychthys nwrgaritatus se encontraron en 60 m. Cuando la temperatura de fondo fue mínima durante marzo de 1996, las mayores abundancias se desplazaron a 40 m de profundidad. La temperatura de máximas abundancias fluctuaron entre 18 y 21 °C, lo cual indica un estrecho rango de preferencia térmica. Se propone un modelo Gaussiano para explicar la relación entre la abundancia y la temperatura
Variation of the bathymetric distribution patterns of the macrobenthic fauna on the continental shelf off Jalisco and Colima, Mexico [Variaciön de los patrones de distribuciön batimétrica de la fauna macrobentönica en la plataforma continental de Jalisco y Colima, Mexico]
No full textThe abundance, in terms of number of individuals and biomass, of the invertebrate communities in one sector of the soft-bottom continental shelf off Jalisco and Colima (Mexico) was analyzed. The cruises were carried out during three hydroclimatic seasons, as defined by the surface current patterns
Variation of the bathymetric distribution patterns of the macrobenthic fauna on the continental shelf off Jalisco and Colima, Mexico [Variaci�n de los patrones de distribuci�n batim�trica de la fauna macrobent�nica en la plataforma continental de Jalisco y Colima, Mexico]
No full textThe abundance, in terms of number of individuals and biomass, of the invertebrate communities in one sector of the soft-bottom continental shelf off Jalisco and Colima (Mexico) was analyzed. The cruises were carried out during three hydroclimatic seasons, as defined by the surface current patterns
Various genotypes of Mycobacterium leprae from Mexico reveal distinct geographic distribution
No full textInto space, stars are the most common source of light. Planets, comets and other types of rocks reflect the incoming light from near stars. It's said that a planet is hidden when the light from the star is brighter than the reflected light from the planet. Vectorial Shearing Interferometer (VSI) is able to distinguish between the light coming from the planet and the light coming from the star, obtaining information the relative position of the planet. We present a simulated method to detect faint sources in the way of bright sources using a VSI based in the detection of the tilt of the wavefront coming from the planet. " 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).",,,,,,"10.1117/12.894929",,,"http://hdl.handle.net/20.500.12104/45663","http://www.scopus.com/inward/record.url?eid=2-s2.0-80053532256&partnerID=40&md5=4ec77a903451f39698175bfe92cf40ab",,,,,,,,"Proceedings of SPIE - The International Society for Optical Engineering",,,,"8154",,"Scopus",,,,,,"faint sources; Vectorial shearing interferometer; Wedge prisms",,,,,,"Vectorial shearing interferometer applied in the faint sources detection",,"Conference Paper"
"47416","123456789/35008",,,,"RITTER,STEVE",,"2011",,,,,,,,"10.1021/cen-v089n005.p120",,"0009-2347","http://hdl.handle.net/20.500.12104/45637","http://pubs.acs.org/doi/abs/10.1021/cen-v089n005.p120",,,,"American Chemical Society",,"5",,"Chemical & Engineering News Archive",,"120",,"89",,"ChemAbsS",,,,,,,,,,,,"newscripts",,"Journal Article"
"47430","123456789/35008",,"Godinez-Dominguez, E., Centre de Ecologia Costera Centro, Universitario de la Costa Sur, Universidad de Guadalajara Gómez, Parias 82, CP 48980, Jalisco, Mexico; González-Sansín, C., Centro de Investigaciones Marinas, Universidad de La Habana, Avenida Primera, 2008 Miramar La Habana, Cuba",,"Godinez-Dominguez, E
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
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