1,721,119 research outputs found
Effect of environment on notch fatigue initiation resistance in CMSX4
No full textCrack initiation at high temperatures has been studied in CMSX4 in both air and vacuum environments, to elucidate the effect of oxidation on the notch fatigue initiation process. In air, crack initiation occurred at sub-surface interdendritic pores in all cases. The sub-surface crack grows initially under vacuum conditions, before breaking out to the top surface. Lifetime is then critically dependent on initiating pore size and distance from the notch root surface. In vacuum conditions, crack initiation has been observed more consistently from surface or close-to-surface pores - indicating that surface oxidation is infilling/"healing" surface pores or providing significant local stress transfer to shift initiation to sub-surface pores
Ben Nealy Miller, M.D., oral history interview, April 7, 1995
No full textDr. Charles S. Bryan, M.D., conducted this oral history interview on April 7, 1995, at the headquarters of the South Carolina Medical Association (SCMA) in Columbia, South Carolina. In this interview, Dr. Ben Nealy Miller, M.D., discusses his childhood, educational and professional background, and his tenure as president of SCMA from 1970 until 1971. During the interview, Miller also discusses the issues encountered by SMCA during his tenure as president, particularly the socialization of medicine
InfoFair 1987- Event Photograph: Donald A. B. Lindberg, M.D., and Randolph A. Miller, M.D.
No full textInfoFair 1987- Presentation of the first biennial Priscilla M. Mayden Award by Donald A.B. Lindberg, M.D., Director, National Library of Medicine, to Randolph A. Miller, M.D., Associate Professor of Medicine, University of Pittsburgh. Thursday, February 26, 1987
InfoFair 1987- Event Photograph: Don Detmer, M.D.; Priscilla M. Mayden; Donald A.B. Lindberg, M.D.; Randolph A. Miller M.D.; Marsden S. Blois, M.D., Ph.D
No full textInfoFair 1987- Dinner and presentation of the first biennial Priscilla M. Mayden Award. Don Detmer, M.D.; Priscilla M. Mayden; Donald A.B. Lindberg, M.D.; Randolph A. Miller M.D.; Marsden S. Blois, M.D., Ph.D. Thursday, February 26, 1987
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
Comparison of low cycle (notch) fatigue behaviour at temperature in single crystal turbine blade materials
No full textThe scatter in notch fatigue lifetimes of CMSX4 at 650ºC and 725ºC in air and vacuum and with Rene N5 in air at 650ºC is compared under the same (plastic) notch strain range levels. Rene N5 shows shorter lifetimes under equivalent conditions and always exhibits multiple initiation sites. The role of interdendritic porosity in initiating fatigue in both alloys is identified, and the number of initiation sites is found to directly affect fatigue life. In air in CMSX4 and Rene N5, subsurface pores initiate fatigue, and this is believed to be due to the repeated in-filling of surface pores by oxidation product, reducing their associated stress concentration and effectively deactivating them as a fatigue initiation site. Tests in vacuum support this hypothesis as cracks do initiate at surface porosity under vacuum conditions. An attempt to evaluate initiating porosity distributions, has indicated a correlation between total area of initiating porosity and fatigue lifetime, which to some extent may allow for crack coalescence behaviour. A deterministic fracture mechanics based model has been proposed to allow for the effect of pore shape, size and position in determining subsequent fatigue life (and hence scatter). The predictions of the model have been assessed using full factorial design of experiments, assessing the effects of variability in pore shape, size and distance below the notch root, as well as the materials parameters (crack growth laws and Kmax) used in the lifing calculation. The model successfully explains some, but not all of the observed scatter in lifetimes
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
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