1,720,994 research outputs found
Grain size distributions in airborne dust, river-suspended loads, and marine sediments from southeastern Turkey (NE Mediterranean Sea)
No full textBetween February 2001 and January 2002, near the coast of Erdemli, southeastern Turkey, 7 airborne dust samples, 7 coastal river-suspended sediment samples, and 3 marine sediment cores were collected. The main objective of this study was to understand the interrelationships among the multisources, multitransportation paths, and changing depositional conditions around the continental shelf of the Lamas River delta. In addition to a detailed study of satellite photos to track atmospheric dust in the region, grain size analyses were conducted on airborne dust, riverine suspensions, and marine sediment (cores), and the results were interpreted using statistical data, such as mean, mode, sorting, skewness, and kurtosis. The bimodal grain size distributions of the airborne dust indicated higher rates of clayey silt accumulation between April and August when compared to the silt and sandy silt concentrations that occurred between September and March. This was explained by the presence of 2 different type source regions of Africa, although the transport mechanism was similar. Similarly, clayey silt was the dominant sedimentary material of the riverine suspensions and no major differences in the data were obtained. Grain size distribution in the 3 marine core samples reflected the presence of a modern deltaic system, where sandy silt and silty sand sediments of the inner shelf graded to clayey silt of the delta front on the midshelf, and further offshore, clayey silt sediments occurred on the outer shelf to form prodeltaic deposits. Grain size changes within the cores were explained in terms the varying source, transportation, and depositional conditions over time. As a result of this research, the contribution of atmosphere and stream sediment inputs to the Cilician Basin budget was investigated. It was thought that the results obtained in this study will contribute significantly to the different research (sedimentological, mineralogical, geochemical, etc.) to be conducted in the Eastern Mediterranean
Recent sedimentology and holocene evolution of the western shelf of the Mersin Bay (ne-Mediterranean Sea)
No full textPh.D. - Doctoral Progra
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
Kilikya Baseni'nin plio-kuvaterner sedimanları,mesinyen evaporitlerinin paleo-topografyası, ve tuz tektoniği, Kuzeydoğu Akdeniz
No full textM.S. - Master of Scienc
Geochemical, sedimantological and mineralogical characteristics of the Black Sea sediments in reference to paleoenvironment
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