1,721,005 research outputs found
Osteoma of the frontoethmoidal sinuses: craniofacial resection and reconstructive strategy.
No full textFrontoethmoidal involvement by benign tumors may lead to aesthetic and functional sequelae. The key for removal of such lesions is a proper planned craniofacial approach based on the preoperative evaluation. If total extirpation requires resection of part of the forehead or orbit, immediate reconstruction is mandatory. In recent years, craniofacial techniques and strategies have become popular. Among these are the use of split cranial bone, rotation of skull bones, the use of galeal-pericranial flaps, and the introduction of internal rigid fixation. We present a case of frontoethmoidal osteoma treated with a combined craniofacial approach. For the reconstruction, modern principles of craniofacial surgery have been applied
Powder diffraction and synchrotron radiation.
No full textPowder diffraction is one of the fundamental techniques for the investigation of materials. Its sensitivity to long range order makes it ideal for the identification, quantification and structural characterization of crystalline phases. Powder diffraction experiments performed at synchrotron sources make ample use of the intrinsic characteristics of synchrotron radiation in terms of energy tunability, brilliance, natural divergence, and excellent signal/noise ratio. Synchrotron radiation powder diffraction (SR-PD) enhances and optimizes the traditional applications of laboratory XRPD, such as phase identification, phase quantification, texture analysis, and peak broadening analysis in terms of stress/strain. However, the properties of the synchrotron X-rays also allow a number of experiments not accessible with laboratory sources, especially in terms of time-resolution, the use of non-ambient sample environments, and simultaneous and combined experiments. The mapping of the physical, chemical, and crystallographic properties of the sample in 2D and 3D using smart combinations of diffraction imaging spectroscopy is the natural current evolution of many synchrotron instruments, and one that is bound to have a great
impact on many aspects of materials studies
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
Haemangioma of the zygoma. Report of two cases with a review of the literature
No full textZygomatic haemangioma is a rare benign neoplasm occurring most frequently in adult females. The authors, after reviewing the available literature, report two cases which presented with a swelling of the zygoma. Resection of the neoplasm, immediate reconstruction with cranial bone grafts and internal rigid fixation was the treatment of choice. Results two years after surgery are presented
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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