1,720,983 research outputs found
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
Platelet and lymphocyte benzodiazepine binding in patients with Alzheimer's disease
No full textPeripheral blood cells, such as platelets or lymphocytes, have been studied in the investigation of systemic derangements and central nervous system biochemical changes occurring in several neuropsychiatric disorders. In the present work, assaying platelet and lymphocyte peripheral-type benzodiazepine binding in patients with Alzheimer's disease (AD) and healthy controls, we found a significantly reduced number of cell receptors in patients' platelets and lymphocytes. These results are discussed with reference to central nervous system biochemical abnormalities in AD. Moreover, the lymphocyte binding data may represent an impairment of the immune response in AD, since lymphocyte surface peripheral-type benzodiazepine receptors seem to be related to immune function
LA NEUROPATIA DELLE PICCOLE FIBRE NERVOSE SENSORIE TRIGEMINALI CAUSA LA SINDROME DELLA BOCCA URENTE
No full text
Three-Dimensional Heat Transfer Modeling of a Moving Plate in Forming Process Applications
No full textA three-dimensional heat transfer model of glass plates heating and cooling has been developed to study their thermal tempering. The furnace being modeled is of a tunnel type, in which the glass plate alternates translational motions with back and forth mouvements with a specified law. An appropriate implementation of a moving (transient) convection/radiation boundary condition has been proposed to describe the heat transfer exchanged between the glass surfaces and the furnace environment. The model results have been experimentally validated by a scanning pyrometer which detects the pointwise temperature of the upper surface of the plate at the exit of the furnace. ©2004 American Institute of Physic
T-cell interferon-gamma binding in patients with dementia of Alzheimer type
No full textOBJECTIVE:
To study T-cell-dependent immune function in patients with dementia of the Alzheimer type (DAT).
DESIGN:
Assay interferon gamma binding on T lymphocytes in patients with DAT, as compared with healthy controls.
SETTING:
The study was performed on ambulatory patients in a tertiary care center, where patients were diagnosed as having DAT according to the National Institute of Neurological Disorders and Stroke criteria.
PATIENTS:
Thirty-five nondepressed patients with DAT (15 women and 20 men; mean [+/-SD] age, 68.6 +/- 15.8 years) were selected consecutively. They were drug free for at least 3 weeks and did not smoke. Illness severity was evaluated according to the Clinical Dementia Rating Scale. The control group comprised 35 age- and sex-matched, healthy nonsmoking subjects, with no family history of neuropsychiatric disorders.
RESULTS:
A significant reduction (P < .001) of T-lymphocyte interferon gamma binding was observed in patients with DAT as compared with healthy controls (611 +/- 19 [SE] vs 702 +/- 11 [SE] receptors per cell, respectively), whereas the dissociation constant (ligand-receptor affinity) values were similar in the 2 groups (1.1 +/- 0.06 [SE] and 1.2 +/- 0.06 [SE] nmol/L).
CONCLUSION:
These data demonstrate a derangement of the immune response in patients with DAT, since cell surface interferon gamma receptors seem to be related with T-lymphocyte immune function
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
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