1,720,993 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
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
VIP: Interactions with NPY and FGF-2 in the modulation of postnatal hippocampal neurogenesis
No full textVasoactive intestinal peptide (VIP) is a 28 amino acid polypeptide that is a modulator of neurodevelopment. High levels of VIP and its receptors have been found in postnatal mammalian hippocampus and are influenced by different physiological and pathological conditions such as exercise, stress, spatial learning and epilepsy, which also affect hippocampal neurogenesis. We are investigating the hypothesis that VIP modulates the survival, proliferation and differentiation of stem cells and their progeny in the postnatal hippocampus.We have investigated the effect of VIP alone or in conjunction with NPY or FGF-2 in primary hippocampal neuronal cultures from postnatal rats (P7–9). Bromodeoxyuridine (BrdU) and Ki-67 were used as markers of cell proliferation. Ara-C was used to inhibit cell proliferation. Quantification of cell death was achieved using the nuclear stain 4?,6-diamidino-2-phenylindole (DAPI) and the cell death marker propidium iodide (PI). Immunohistochemistry was used to phenotype cells for nestin, GFAP, and class-III beta-tubulin.We have shown that VIP enhances the survival of postnatal nestin positive hippocampal stem cells and their progeny in a dose dependent manner. At micromolar concentrations, VIP increased cell proliferation and the labelling index. However, at nanomolar concentrations, we observed a purely trophic effect on both mitotic and non-mitotic cells. When cells were exposed to VIP in conjunction with the mitogens NPY or FGF-2, VIP abolished and decreased their proliferative effects respectively. Interestingly, the proportion of neuroblasts increased under VIP plus NPY conditions while the number of progenitor cells increased under VIP plus FGF-2 conditions.We conclude that VIP may be an important trophic factor for hippocampal neurogenesis and interacts with NPY and FGF-2 to modulate the proliferation of stem cells and the survival of their progeny. We suggest that these neuropeptides and others provide a novel control system for postnatal hippocampal neurogenesis depending on their differential release.<br/
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Critical review and economic feasibility analysis of electric energy storage technologies suited for grid scale applications
Full text linkRadical changes in production paradigms are affecting electric systems. This is due to Renewable Energy Sources (RES) introduction, which changed production from being centralized and dispatchable, to be more decentralized and unpredictable. Further transformations are expected as the RES share into electric grids will increase. RES further development will likely rely mostly on additional solar PV capacity, then relevant energy quantities will be needed to be shifted from day hours to evening and night hours. Such "Load Shifting" could be performed with Electric Energy Storage (EES) technologies. Few technologies suited for this are already commercially available, whereas others have been proposed. In this paper, the EES technologies suited for load shifting are reviewed with a focus on economic costs. After that, current and future EES economic feasibility are assessed by using Italian hourly energy prices from 2018. Since EES resulted to be currently uneconomic, the minimum price modification required to make EES feasible is calculated
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