1,723,637 research outputs found
Percentage of observed answer categories of QRPs across 6813 respondents.
No full textPercentage of observed answer categories of QRPs across 6813 respondents.</p
Vibrational predissociation of the ND3-Ar Van der Waals complex : comparison with NH3-Ar
No full textContains fulltext :
6813.pdf (Publisher’s version ) (Open Access
Purification and characterization of neurotoxin produced by Clostridium botulinum type C 6813
No full textThe toxin produced by Clostridium botulinum type C 6813 (C-6813) was purified 1,009-fold from the culture supernatant in an overall yield of 30%. The specific toxicity was 1.1 X 10(7) mouse minimum lethal doses per mg of protein. The toxin had a molecular weight of 144,000, composed of the light and heavy chains with molecular weights of 52,000 and 92,000, respectively, linked by one or two disulfide bond(s). The purified C-6813 toxin heavy and light chains reacted strongly with anti-type D heavy chain immunoglobulin G and anti-type C1 light chain immunoglobulin G, respectively. The amino acid compositions of C-6813 toxin heavy and light chains were more similar to those of type D heavy chain and type C1 light chain than to those of type C1 heavy chain and type D light chain, respectively. These results suggest that in the toxin produced by the type C strain at least two subtypes exist
LL-Chondrite Northwest Africa 6813: sampling an impact-cratered asteroid
No full textImpact cratering is one of the dominant geologic processes affecting asteroids. It results in shock-induced melting and the formation of impactites, including impact melt breccias. Meteoritic samples of these breccias possess petrologic and geochemical signatures that can be used to deduce the collisional evolution of the respective parent body, such as the timing of the event, shock metamorphic conditions during the impact, subsequent two-stage cooling, and an estimate of the size of the impact crater itself. In this study we analyzed the petrography and mineral chemistry of Northwest Africa (NWA) 6813 in order to elucidate its thermal and impact history. NWA 6813 was classified as an LL6 impact melt breccia [1], which is part of a group of ordinary chondrites whose impact lithologies remain poorly described
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
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
Video-rate or high-precision: A flexible range imaging camera
No full textA range imaging camera produces an output similar to a digital photograph, but every pixel in the image contains distance information as well as intensity. This is useful for measuring the shape, size and location of objects in a scene, hence is well suited to certain machine vision applications.
Previously we demonstrated a heterodyne range imaging system operating in a relatively high resolution (512-by-512) pixels and high precision (0.4 mm best case) configuration, but with a slow measurement rate (one every 10 s). Although this high precision range imaging is useful for some applications, the low acquisition speed is limiting in many situations. The system’s frame rate and length of acquisition is fully configurable in software, which means the measurement rate can be increased by compromising precision and image resolution.
In this paper we demonstrate the flexibility of our range imaging system by showing examples of high precision ranging at slow acquisition speeds and video-rate ranging with reduced ranging precision and image resolution. We also show that the heterodyne approach and the use of more than four samples per beat cycle provides better linearity than the traditional homodyne quadrature detection approach. Finally, we comment on practical issues of frame rate and beat signal frequency selection
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
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