1,720,982 research outputs found
An operational analysis of shell planting strategies for improving the survival of oyster larvae in the Chesapeake Bay
No full textMaryland's oyster fishery has declined dramatically since 1930. Meanwhile, recent studies have shown that careful management of the shell planting process can lead to increased oyster yields. This is due to the fact that oyster larvae that attach to fossil shells at the bottom of the Chesapeake Bay have a greatly enhanced likelihood of survival. In this paper, we indicate how linear programming and a rule-based heuristic can be used in tandem to determine effective sites and schedules for shell planting. In particular, linear programming is used to address the macro problem of deciding where to plant the shells, subject to high-level constraints. The rule-based heuristic addresses the micro problem of scheduling tugboats, barges, and the planting crew, subject to more detailed constraints.Computer Science, Information SystemsOperations Research & Management ScienceSCI(E)0ARTICLE3181-1963
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
Expression and role of P2X7 receptor splice variants in osteosarcoma
No full textThe P2X7 receptor for extracellular ATP was recently indicated as determinant in tumour formation, growth, vascularization and metastatization in different experimental cancer models. Despite the fact that P2X7 promotes osteogenesis affecting osteoblast proliferation and osteodeposition studie investigating P2X7 involvement in a primary bone tumor, such as osteosarcoma, were lacking. For these reasons, we examined P2X7 expression in human osteosarcomas. The receptor was detected by immunohistochemistry on an osteosarcoma tissue array using two difefrent anti-P2X7 antibodies: a monoclonal antibody directed against the extracellular loop of the molecule, and a polyclonal antibody recognizing the intracellular C-terminal tail. These two antibodies allow recognition of two different P2X7 splice variants: the full length P2X7A isoform and the C-terminal truncated P2X7B. Both these isoforms were related to a trophic activity in difefrent cell types. We showed a greater number of tmour specimens labelled by the monoclonal antibody (85%) with respect to the polyclonal one that labelled the 65% of the osteosarcoma samples, suggesting that P2X7B will be the most represented in osteosarcoma. These data prompted us to investigate the role of P2X7A and B in Te85 osteosarcoma cell line that does not endogenously express the receptor. Te85 were stably transfected with P2X7A, B or both. P2X7 transfected cells showed higher proliferation in absence of serum and more elevated NFATc1 levels than Te85 wt cells. In accordance to what suggested by osteosarcoma expression Te85 P2X7B transfected cells were those showing the highest proliferation rate. Moreover mRNA for RANK-L, the main regulator of osteoblast-osteoclast cross talk, was significantly decreased in all P2X7 transfected clones. Fianlly, osteodeposition was significantly decreased in Te85 P2X7B cells and increased in Te85 P2X7A+B clones. Taken together our data strongly suggets that both P2X7 isoforms have a role in osteosarcoma biology affecting tumour cell growth and interaction with osteoclasts together with osteodeposition
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
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
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