1,726,526 research outputs found
The influence of foreign gases on the intensities of the magnesium resonance lines 4571 and 2852
No full textThe Mg line 4571, 31S-33P1, is very weak in the arc while 2852, 31S-31P, is very intense. The life of the 33P1 state is calculated to be 4×10^(-3) sec., while 31P has a life of 3×10^(-9) sec. Collisions of second kind between excited Mg atoms reduce intensity of 4571 in the arc. At a vapor pressure of 10^(-4) mm, the time between collisions of the Mg atoms is 10^(-3) sec. The 4571 line should appear strong at this or lower vapor pressures. Vapor from solid Mg metal at 500°C was excited in an evacuated tube by an electrodeless short-wave discharge. The 4571 line appeared in the discharge as a fairly prominent line.
Effect of foreign gases on 4571. The noble gases enhanced this line, the intensity relative to the triplet 3838 increasing up to about 20 mm in argon and 10 mm in neon and helium and then remaining practically constant. At these pressures, argon increased the line 100 times, Ne about 70 times, and He about 40 times. N2 and CO increased 4571 up to the limit of pressure, about 2 mm, at which the discharge could be operated. H2 caused a slight increase at a pressure of about 2 mm.
Intensity-pressure curves for noble gases have been reproduced theoretically, proving the assumption that excited Mg atoms suffer collisions of the second kind with the walls, and that action of a noble gas in enhancing the 4571 line is due entirely to the slowing up of diffusion of Mg atoms in 23P1 state to the walls, and to its inefficiency in causing collisions of the second kind with excited Mg atoms.
Effect of foreign gases on 2852. All gases reduce 2852 and all singlets terminating on the 31P level. Increasing pressure of H2 reduces 2852 faster than the singlets. Dissociation of the H2 molecules by Mg atoms in 31P state reduces radiation from that state
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Linked collectors and determiners for: Coleção de Ascidiacea do Museu Nacional - UFRJ.
No full textNatural history specimen data linked to collectors and determiners held within, "Coleção de Ascidiacea do Museu Nacional - UFRJ". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/c6609a9b-1c94-4571-a419-8a90c365cc69">https://bionomia.net/dataset/c6609a9b-1c94-4571-a419-8a90c365cc69</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/c6609a9b-1c94-4571-a419-8a90c365cc69">https://gbif.org/dataset/c6609a9b-1c94-4571-a419-8a90c365cc69</a>. Formatted as a Frictionless Data package
Variations on the Author
No full text“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
No full textWe 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
No full textWe 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
A 4571 node 4762 edge directed weighted Bitcoin address subgraph
No full textThis dataset contains an address subgraph of the Bitcoin network comprising 4571 nodes and 4762 edges. Every line contains 2 Bitcoin addresses separated by a comma, followed by a Bitcoin amount. This represents a directed edge in this subgraph. This data was extracted from the Bitcoin transaction network by Phetsouvanh Silivanxay. The amount is computed by agglomerating the involvement of the nodes in different transactions as explained in the accompanying paper
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
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