1,721,027 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
Reducing the vertical transmission of HIV - Italian obstetricians often don't ask women to take test
No full textFare il vino nell'Italia antica. I palmenti rupestri (Documentario presentato nell'ambito della tavola rotonda "La cultura del vino nel Mediterraneo", EXPO Milano 2015)
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STUDY OF THE PORCINE ELECTRORETINOGRAM AS PRECLINICAL MODEL FOR THE TREATMENT OF THE HUMAN RETINA HEREDITARY DEGENERATIONS
No full textThe present work has the aim to analyze, for the first time, the physiological activity of the pig’s retina using a standardized human electoretinogram protocol approved by the International Society for Clinical Electrophysiology of Vision (ISCEV). The experiment was conducted at the Livestock and Animal Testing unit of the Physiology service of the Department of Veterinary Medical Sciences of the University of Bologna, in accordance with the national and international guidelines on animal experimentation. All procedures were examined by the Ethics Committee of the University of Bologna, authorized in derogate by the Ministry of Health and controlled by the Central Veterinary Service of the University of Bologna during the implementation phase. The subjects are 30 healthy females piglets of 3 months old and weighing 30 kg. The pre medication is performed using Azaperone (2mg/kg of Stresnil) by intramuscular injection behind the ear. Then, the Ketamine (20mg/Kg of Ketavet), Medetomidine (0,04mg/kg of Medetor) and Atropine (0.04 mg/kg of Atropine sulfate) mixture is injected intramuscularly. The subject is left alone until the loss of the righting reflex. Two drops of mydriatic (Tropicamide 1%) per eye are instilled to obtain the necessary paralysis of the pupil. The instrument used for the retinal exam, is a Ganzfeld Stimulator Model GS-MAX for use in humans. The electrical signal data is recorded, amplified and analyzed by the program EREV2000 previously set for ERG sessions running in series. The electrodes are ERG-jet metal conductor model to transfer the bioelectric signal to the amplifier and they are divided in: subcutaneous or inox needle and corneals. Four different light stimulations are sent in order to record the photoreceptors response and to compare the average amplitudes for each protocol with the human and mouse data present in literature. This study confirm that a high cone density and the particular pig’s photoreceptor topography allow this animal to be the better choice for experimental modelling of human cone diseases than mouse. Additionally, this wide data background is a good resource for researchers involved in ophthalmic studies to choose the correct animal model for their experiment and to use the smallest possible number of animals needed to obtain a scientifically valid result
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