1,720,982 research outputs found
Detection of local recurrence with 3-tesla MRI after radical prostatectomy: A useful method for radiation treatment planning?
Full text linkBackground/Aim: Salvage radiotherapy improves biochemical control in patients with recurrence of prostate cancer after prostatectomy. Radiotherapy target volumes of the prostatic fossa are based on empirical data and differ between different guidelines. Localization of recurrence with multiparametric magnetic resonance imaging (MRI) might be a feasible approach to localize recurrent lesions. Patients and Methods: Twenty-one patients with biochemical recurrence after radical prostatectomy were included (median prostate-specific antigen (PSA) =0.17 ng/ml). Multi-parametric MRI was performed using a 3-T MR system. Results: Lesions were detected in seven patients with a median PSA of 0.86 ng/ml (minimum= 0.31 ng/ml). Patients without detectable recurrence had a median PSA of 0.12 ng/ml. All patients with detectable lesions responded to radiotherapy. Eleven out of 14 patients without detectable recurrence also responded. Plasma flow in suspicious lesions was correlated with PSA level. Conclusion: Detection of recurrence at the prostatic fossa with our approach was possible in a minority of patients with a low PSA level. Clinical relevance of plasma flow in suspicious lesions should be further investigated
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
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
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
In-situ Verformung von lamellaren metallischen Kompositen im Großkammer-Rasterelektronenmikroskop
Full text linkThe following thesis shows the influence of the layer-architecture of lamellar metallic composites. The large potential of such materials demands a thorough investigation of the underlying porperties of these and similar materials, which are partly already in use in aerospace applications. By combining Aluminum and Copper with the „Accumulative Roll Bonding“-process to a metallic composite, the influence of strength, strain-rate-sensitivity and the gradient of the Young’s Modulus was investigated. Furthermore, the crack initiation mechanism in copper was analyzed. The in depth study to investigate the layer-architecture of metallic composites was done by using the Large-Chamber Scanning-Electron-Microscope for in-situ investigations, as well as Nano indentation, static and dynamic investigation methods. The investigation showed that the stacking sequence of the different materials is of importance, as well as the strength difference between the utilized metals. During fatigue investigations it became clear, that the crack initiation mechanism is very important. For copper an in-depth investigation using EBSD, FIB-tomography and in-situ investigations in the Large-Chamber Scanning Electron Microscope have been performed. The investigation clearly shows the mechanism of crack initiation dependent on grain orientation, as well as evidence for grain boundary migration.Die folgende Arbeit untersucht den Einfluss der Lagenarchitektur von lamellaren metallischen Kompositen. Das große Potential derartiger Werkstoffe erfordert ein sorgfältiges erforschen der zugrundeliegenden Eigenschaften dieser und ähnlicher Werkstoffe, die zum Teil bereits heute im Flugzeugbau eingesetzt werden. Dafür wurden die Einzelwerkstoffe Aluminium und Kupfer mit Hilfe des „Accumulative Roll Bonding“-Prozesses zu lamellaren metallischen Werkstoffen hergestellt und deren Eigenschaften charakterisiert. Zudem wurde die Ermüdungsrissentstehung an Kupfer näher analysiert. Unter Zuhilfenahme der in-situ Verformung im Großkammer-Rasterelektronenmikroskop, der Nanoindentierung, sowie statischer und dynamischer Prüfungsmethoden wurden die verschiedenen Einflüsse der Werkstoffe und deren Stapelfolge untersucht. Dabei zeigt es sich, dass die Stapelfolge der unterschiedlichen Werkstoffe von besonderem Interesse ist. Auch auf die Kombination der Werkstoffe in Hinblick auf deren Dehnratenabhängigkeit, Festigkeit und auf den Gradienten des E-Modul zwischen den Lagen wird eingegangen. Der Unterschied in der Festigkeit der verwendeten Metalle ist eine der wichtigsten Einflussgrößen auf die unterschiedlichen Eigenschaften bei verschiedenen Stapelfolgen. Im Falle der Ermüdungsuntersuchung ist die unterschiedliche Rissentstehung von besonderem Interesse. So wurde exemplarisch am Kupfer der Mechanismus der Rissentstehung genauer mit Hilfe von EBSD, FIB Tomographie und Ermüdungsversuchen im Großkammer-Rasterelektronenmikroskop untersucht. Durch die intensive Analyse des Rissentstehungsmechanismus konnten neben der klaren Darstellung der Rissenstehung in Abhängigkeit der Kornorientierung auch Hinweise auf Korngrenzwanderung gefunden werden
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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