1,721,232 research outputs found
Singular structure of the fundamental solution of the transport equation
No full textBondarenko, A.. (1997). Singular structure of the fundamental solution of the transport equation. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/3068
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
Convex bodies of constant width with exponential illumination number
No full textArman A. Convex bodies of constant width with exponential illumination number / A. Arman, A. Bondarenko, A. Prymak // Algebraic and geometric methods of analysis - 2023 : abstr. of the Intern. sci. conf., Odesa, 29 May - 1 June 2023 / [Odesa Nat. Univ. of Technology et al.] ; sci comm.: [Yu. Fedchenko, N. Konovenko et al.]. - Odesa, 2023. - P. 88-89
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
CATACLEAN the composite material for the passive degradation of indoor organic pollutants
No full textOrganic pollutants: use of diffusive and adsorptive processes for ecological risk assessment
No full textContaminated sites recovery is time consuming and involves increasingly high costs, despite in presence of limited economic resources availability. The existing legislation or guidelines currently stand on the total soil content of pollutants. Feature of soil pollution is that components of ground (organic mass, clay minerals) are capable to adsorb organic compounds and a part from them are kept irreversibly. At an identical total level of pollution the soil of various structures represent a various level of ecological risk. Therefore it should be possible to assess ecologically the risk of soil, evaluating the mobile fraction of pollutants by means of diffusive gradient technique in thin film (DGT) [1]. Principles of an estimation of ecological risk with DTG-device have been confirmed for the heavy metals determination [2].
In the given research there was a task to carry out tests of the above mentioned unit in conditions of soil pollution by organic compounds. In the case of hydrocarbon absorption it is necessary to replace the resin with an opportune adsorbent and to realize a diffusion layer transparent for organic pollutants. The device, realized by authors, consists of an assembly containing a layer of water-saturated adsorbent and a chamber of deionized water, confined between glass fiber filters, as diffusion layer. Such design allows diffusion of hydrocarbons from soil through soil solution to adsorbent. Thus there is a displacement of equilibrium and begins desorption from solid phase to soil solution.
In the case of correct selection of the adsorbent it is possible to estimate the quantity of pollutant, capable to resupply in soil solution. Values of the parameters, describing transport of hydrocarbons in a solution from soil solid phase, were received experimentally. The trend in time variation of these parameter show a law similar to that obtained in soil pollution by heavy metals ions. Hence, the principle of DGT technique can be also extended for an estimation of the ecological risk on soil pollution by organic compounds.
(1)Ruello, ML, Sileno, M, Sani, D, Fava, G. (2008) DGT use in contaminated site characterization. The importance of heavy metal site specific behaviour. Chemosphere, 70, 1135-1140
(2)Lehto, NJ, Sochaczewski, Ł, Davison, W, Tych, W, Zhang, H. (2008) Quantitative assessment of soil parameter (KD and TC) estimation using DGT measurements and the 2D DIFS model. Chemosphere, 71, 795-80
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