1,721,203 research outputs found
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
The Impact of miRNAs in Health and Disease of Retinal Pigment Epithelium
No full textMicroRNAs (miRNAs), a class of non-coding RNAs, are essential key players in the control of biological processes in both physiological and pathological conditions. miRNAs play important roles in fine tuning the expression of many genes, which often have roles in common molecular networks. miRNA dysregulation thus renders cells vulnerable to aberrant fluctuations in genes, resulting in degenerative diseases. The retinal pigment epithelium (RPE) is a monolayer of polarized pigmented epithelial cells that resides between the light-sensitive photoreceptors (PR) and the choriocapillaris. The demanding physiological functions of RPE cells require precise gene regulation for the maintenance of retinal homeostasis under stress conditions and the preservation of vision. Thus far, our understanding of how miRNAs function in the homeostasis and maintenance of the RPE has been poorly addressed, and advancing our knowledge is central to harnessing their potential as therapeutic agents to counteract visual impairment. This review focuses on the emerging roles of miRNAs in the function and health of the RPE and on the future exploration of miRNA-based therapeutic approaches to counteract blinding diseases
The first farming communities in the Southwest European Coast: A traceological approach to the lithic assemblage of Vale Pincel I
No full textVale Pincel I is one of the most relevant sites for the study of the Neolithic transition in the Southwest Portuguese Coast. Despite that, the acidity of sediments prevented the conservation of the botanical and faunal materials at the site, limiting its interpretation. In this work, we present the results of the traceological analysis of the Vale Pincel I flaked stone assemblage; our objective is to advance a first reconstruction of the site economy on the basis of the working process observed by the microscopic observation of a sample of lithic tools. The results indicate that at Vale Pincel I crop-harvesting activities covered a primary role, suggesting an early onset of agricultural practices in Southwestern Portugal. Moreover, a variety of different production tasks have been detected, pointing toward the existence of a mixed type of economy in which farming interplayed with foraging and crafting practices. © 2016 Elsevier Inc
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
Thermal recovery from landfill biogas after energy exploitation
No full textBiogas generated in a Municipal Solid Wastes landfill is collected and, when economically advantageous, it is exploited in internal combustion engines to produce electric energy, also taking into account that at present, excellent transformation efficiencies are achievable, precisely 38-40 % of the biogas thermal content.
The flue gas deriving from combustion is at about 500 °C, in other terms it has still a valuable enthalpic content. In addition, the engines need lubrification and refrigeration loops, and intercooler devices to cool down the compressed gas mixture before entering the engines themselves. In this frame, thermal recovery is possible by modular heat exchangers: they produce hot water, cooling down respectively oil, water and gas. Moreover, the flue gas can be cooled from 500 °C to 180 °C.
In this paper, the Municipal landfill of Torino, Northern Italy, has been considered for a study on thermal recovery from biogas after its energy exploitation.
The considered recovery operations are:
- district heating
- absorption chilling
- sludge drying
- superheated steam production.
Different scenarios are possible, according seasonability, thermal level and quantities of recovery
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