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Nickelbasis Superlegierung UDIMET 720 Li - Entstehung Mono- und Multimodaler Ausscheidungsverteilungen von Gamma Strich
No full textDas vorliegende Buch beschäftigt sich mit der Untersuchung der Ausscheidungsentwicklung im Werkstoff UDIMET 720 LI bei der kontinuierlichen Abkühlung aus dem lösungsgeglühten Zustand. Primäres Ziel ist es, die Ausscheidungskinetik und die Teilchenverteilung experimentell sowie theoretisch mit Hilfe der Simulationssoftware "MatCalc", zu untersuchen. Für die experimentelle Beschreibung des Mikrogefüges wurden 17 Proben mit unterschiedlichen Abkühlraten wärmebehandelt und mit Hilfe unterschiedlicher Methoden der Elektronenmikroskopie analysiert. Mittels einer digitalen Bildanalyse wurden diese Aufnahmen quantitativ ausgewertet und somit die Ausscheidungsparameter bestimmt. Die Ergebnisse wurden mit denen der Simulation verglichen und diskutiert. Abschließend wurden zwei Parameterstudien zum Zwecke der Darstellung der Sensibilität der Simulationsergebnisse auf die Eingabeparameter durchgeführt
Additive Fertigung am IMPE : von nachhaltigen Biopolymeren, funktionalen Keramiken und metallischen Hochleistungslegierungen bis hin zu Multimaterialanwendungen
No full textGoing 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
Additive Fertigung am IMPE : von nachhaltigen Biopolymeren, funktionalen Keramiken und metallischen Hochleistungslegierungen bis hin zu Multimaterialanwendungen
No full textNumerical Simulation of the Precipitation Kinetics of Nitrides and Carbides in Microalloyed Steel
No full textThe present work deals with the numerical simulation of the precipitation kinetics of nitrides and carbides during isothermal annealing of microalloyed steel. A newly developed model is employed, which takes into account the predominant precipitation of particles at grain boundaries, together with the classical treatment for randomly distributed precipitates in the grain interior. It is demonstrated, that the precipitation of nitrides and carbides can be modelled in a consistent way if simultaneous precipitation at grain boundaries and at dislocations is taken into account, dependent on chemical composition, grain size and annealing temperature. It is also demonstrated that, for consistent simulations, it is necessary to account for several physical mechanisms that are often neglected in this type of simulations, among them the precipitate/matrix volumetric misfit, the temperature dependent Young`s modulus, composition-, temperature- and size-dependent interfacial energies, as well as the ratio between bulk and grain boundary diffusion. Finally, a new simulation approach is presented for the calculation of the precipitation kinetics of microalloying phases during casting. It is shown that segregation effects during solidification play an important role and must be considered when doing precipitation kinetics calculations. All precipitation kinetics simulations are compared to independent experimental results from literature
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
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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