1,721,020 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
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
Wet Aggregate Stability Index : precision assessment of Tiulin method trough an inter-laboratory test
No full textTo monitor the soil quality evolution and provide practical management solutions, rapid and effective tests of soil status have to be identified and quantitative information about their reliability provided. In this study, the precision of the Tiulin method for soil wet aggregate stability index (WASI) was evaluated through an inter-laboratory test, according to the validation procedure proposed by ISO 5725. Precision was expressed in terms of repeatability (sr) and reproducibility (sR) standard deviations with related limits (r and R). Six different soils, collected from three Italian agricultural areas, with different organic matter and clay contents, were chosen and six measurement replicates were carried out for each combination of soil and laboratory. The values of sr and s R, obtained after the detection of outliers according to the Grubbs (outliers in the means) and Cochran tests (outliers in the variances), ranged from 0.92 to 2.93 and from 1.42 to 12.31, respectively. The corresponding r and R ranged from 2.57 to 8.22 and from 3.98 to 34.48. No significant correlations were found either between WASI and r or between WASI and R. On the contrary the relative standard deviation of repeatability was inversely correlated (R 2 = 0.88, **p < 0.01) with soil organic matter. The precision is within the range of other chemical and biological methods and can be considered satisfactory. The results obtained in this study have demonstrated the suitability of the Tiulin method as a standard method for monitoring soil physical quality
Treatment of fever in neurosurgical patients
No full textEven moderate temperature elevations soon acute cerebral damage may markedly worsen initial brain injury. These effects may justify aggressive antipyretic treatment in neurosurgical intensive care unit (NICU). On the basis of a literature survey, it is observed that fever is extraordinarily common in the neurosurgical intensive care unit during the acute phase of subarachnoid hemorrhage, stroke, and traumatic brain injury. Several clinical studies also suggest worsened neurologic outcome in patients who are febrile compared to those who are not. Pyrexia is more frequent in infected than noninfected patients. Infections (mainly in the respiratory tract) are usually diagnosed in the majority of febrile NICU patients. Laboratory investigations are quite clear regarding the adverse effects of fever in terms not only of functional outcomes, but also histological and neurochemical injury. Even though fever may cause diagnostic confusion (central fever vs infectious), the potentially devastating effects of pyrexia in patients with cerebral diseases may proceed to treat in any case. An attempt to correct fever appears warranted in all patients with acute cerebral damage in order to obtain a better functional recovery and to limit maximally any further insult to the brain. Some of the more common and innovative methods to control body temperature in order to mitigate the detrimental effects of pyrexia following acute neurological injury are explored. Maintenance of normothermia appears to be a desirable therapeutic goal in managing the patients with damaged or at-risk brain tissue. However, it has not been established conclusively that the benefits of antipyretic therapy outweigh its risks and that despite a sound physiologic argument for controlling fever in the brain-injured patient, there is no evidence that doing so will improve their outcome
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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