1,720,956 research outputs found
Computed tomography study of pineal calcification in schizophrenia
No full textComputed tomography studies concerning pineal calcification (PG) in schizophrenia have been conducted mainly by one author who correlated this calcification with several aspects of the illness. On the basis of these findings the aim of the present study was to analyze size and incidence of pineal gland calcification by CT in schizophrenics and healthy controls, and to verify the relationship between pineal calcification and age, and the possible correlation with psychopathologic variables. Pineal calcification was measured on CT scans of 87 schizophrenics and 46 controls divided into seven age subgroups of five years each. No significant differences in PC incidence and mean size between patients and controls were observed as far as the entire group was considered. PC size correlated with age both in schizophrenics and controls. We found a higher incidence of PG in schizophrenics in the age subgroup of 21-25 years, and a negative correlation with positive symptoms of schizophrenia in the overall group. These findings could suggest a premature calcific process in schizophrenics and a probable association with 'non-paranoid' aspects of the illness. Nevertheless the potential role of this process possibly related to some aspects of the altered neurodevelopment in schizophrenia is still unclear. (C) 1999 Elsevier, Paris
Evaluation of physical properties of dredged sediments for beach nourishment.
No full textMany beaches along the coast of Emilia-Romagna Region are eroding, which threatens habitat, property, public infrastructure, and the tourist industry. Loss of sand can be attributed to natural factors such as storms, waves, currents, tides, wind, sand supply and quality, etc. Shortages of sediment can also arise from man-made activities including extensive sand mining of river beds, plus the large-scale destruction of natural shoreline defences for urban and tourist development.
Legislative and regulative constraints at national and regional level address these issues toward exploitation of offshore sand deposits to replenish beach erosion occurring at regional scale, but only few deposits are elected as potentially compatible with beach nourishment projects. On the other hand, some hundred thousands cubic meters of sediments regularly dredged from ports located along the regional shoreline, have been and are being disposed in rehandling facilities, namely, Confined Disposal Facilities (CDFs), and could represent an alternative source for beach nourishment material. One of the property of interest in the performance of replenishment/nourishment projects is the physical compatibility between the fill material and the ‘native’ material of the beach. Typically, grain size is the most commonly evaluated in trying to match a fill material with a native material mainly because of its potential mechanical performance within the hydrodynamics of the beach environment.
In this paper, a comparison of the grain size parameters of dredged sediments vs. nourishing beach sediments along Emilia-Romagna shoreline is presented. Surface sediment samples were taken from the beach at different depths along Lido di Dante shoreline (Ravenna, Italy) to characterize pre-nourishment conditions. Several representative composite samples were also taken from a confined disposal facility (CDF) located within the harbour area of Ravenna town. Standard grain-size analysis tests were conducted for all samples to obtain their grain-size distribution curves, which were then used to assess the compatibility of dredged sediments for beach nourishment. The results indicate that native beach sediments show variations in grain-size distribution from the profile of the beach face to the lower foreshore, but were dominated by medium and fine sands. Grain-size distributions of dredged material were quite similar, with some exceptions. Previous experiences suggest that similar composition of the native beach and filling material could help controlling the post-nourishment profile stability, and prediction of the required fill volume to provide the desired beach width can then be performed with a reasonable degree of accuracy
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
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