1,721,349 research outputs found
Robb M. Thomson
No full textRobb M. Thomson
Inducted: 2000
Citation: For leadership of research on failures of and failure avoidance in materials and management of the NIST postdoctoral program.
Tenure: 1971-1995
Birth: 1925, El Paso, Texas
Education:
University of Chicago, MS, 1950
Syracuse University, PhD (Physics), 1953
Positions held:
Senior Research Scientist, Institute for Applied Technology
Program Coordinator for Failure Avoidance
NIST Post Doctoral Program Director
NBS/NIST Fellow, Materials Science and Engineering Laboratory
Post retirement: Emeritus Fellow
Honors:
U.S. Department of Commerce: Silver Medal, 1980; Gold Medal, 1987
Memberships:
American Physical Society (Fellow)
American Association for the Advancement of Science
American Society for Metals
American Institute of Metallurgical Engineers
Publications:
Author of technical papers, book chapters and encyclopedia articles on the theory of imperfections in solids and their mechanical properties and one book: Physics of Solids, McGra
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
Conical intersections as a mechanistic feature of organic photochemistry
No full textThe photochemical decay channel is the central point of a photochemical mechanism. The traditional view of the mechanism of a photochemical reaction assumes that the excited state reaction path is similar to the ground state path and the decay channel corresponds to an avoided crossing minimum (van der Lugt and Oosterhoff model). In contrast, we find that there is no evidence for a decay path via such an avoided crossing minimum and that excited state reaction paths are very different from those on the ground state. Rather, the photochemical decay channel corresponds to a conical intersection point and plays the central role in mechanistic photochemistry.
The nature of the conical intersection point and its mechanistic implications will be discussed for 3 illustrative types of photochemical reactions (2+2 cycloadditions, polyene electrocyclization/isomerisation, and the di-pi-methane rearrangement)
Predicting forbidden and allowed cycloaddition reactions: potential surface topology and its rationalization
No full textAppropriate 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
Following reaction paths in organic photochemistry: The special role of surface crossings
No full textIn this paper we discuss the mechanistic importance of surface crossings in various types of organic photochemical reactions which include the photocycloaddition of alkenes and the photochemistry of butadiene and acrolein. We discuss both the role of conical intersections which occur between states of the same multiplicity (most commonly singlet-singlet) and of intersystem crossings that occur between states of different multiplicity (typically singlet-triplet)
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
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