1,721,005 research outputs found
Digital radiology with storage phosphors in cephalometric study in orthodontics
No full textConventional radiology is continually modified with the development of digital systems which can be used for several types of radiologic examinations. Our study was aimed at evaluating the advantages of these new technologies in the orthodontic field, where the problems associated with image quality and radiation protection are major especially in young patients; the latter goal is achievable by dramatically reducing radiation dose and by avoiding repeating the exam. In our study, we compared lateral teleradiographs of the skull for cephalometric analysis obtained using conventional and digital diagnostic methods. The preliminary results demonstrated that the two imaging techniques did not differ relative to bone structure representation, even though the digital system provided better visualization of soft tissue structures. Computed radiography also allowed a marked reduction in the number of repeats and reduced radiation dose. The current disadvantages of this imaging method are the high initial cost of the equipment, reduced work rate, and the need of frequent technical assistance
APPLICAZIONE DEL RENDERING VOLUMETRICO CON TC SPIRARLE AD ALTA RISOLUZIONE NELLO STUDIO DELL’ARTICOLAZIONE TEMPOROMANDIBOLARE
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Osteoid osteoma of the jaw in Gardner's syndrome. A case report [Osteoma osteoide della mandibola nella sindrome di Gardner: Descrizione di un caso]
No full text[No abstract available
Mineral metabolism and calcitriol therapy in idiopathic juvenile osteoporosis
No full textIdiopathic juvenile osteoporosis is a rare cause of osteoporosis during childhood. We examined four children (three boys and one girl, ranging in age from 2.3 to 12.6 years) with idiopathic juvenile osteoporosis. All of these patients had normal serum calcium, ionized calcium, phosphate, magnesium, 25-hydroxyvitamin D, intact parathyroid hormone, and total and extractable calcitonin levels. 1,25-Dihydroxyvitamin D values were low in three patients and slightly decreased in one. Three children were treated with calcitriol (1,25 - dihydroxycholecalciferol) (0.50-mu-g/d in two and 0.25-mu-g/d in the other). The fourth patient was not treated because of parental refusal. Therapy reduced the fracture rate. Follow-up at 6 and 12 months showed a significant increase in bone mineralization, which reached normal values in two children after 12 months of treatment. No side effects of calcitriol therapy were observed. The untreated patient did not show an improvement of bone mineralization in the same time
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
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