1,721,049 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
Valutazioni clinico-chirurgiche e diagnostiche nelle lesioni delle mucose del cavo orale mediante biopsia ed esame isto-morfologico :analisi comparativa di due metodiche di prelievo.
No full textIn this study, the authors evaluated the clinical and histologic efficacy of electrosurgery (DTC 100) in performing excisional biopsy on benign mucosal lesions, in comparison with traditional surgery (scalpel and suture). For this aim, 40 biopsy specimens were selected and divided into 4 distinct groups: group A1, samples of oral lesions located on the genian mucosa and removed using DTC 100; group A2, samples of healthy genian mucosa removed using DTC 100, as control; group B1, samples of oral lesions located on the genian mucosa and removed using traditional surgery; group B2, samples of healthy genian mucosa removed using traditional surgery, as control. The clinical evaluation was carried out regarding symptomatology and bleeding after surgery, healing time, restitutio ad integrum. It gives positive results for the electrosurgical technique, in which the suture is not necessary. The histologic evaluation regarding the microscopical adequacy of specimens removed by means of electrosurgery shows better results than those from other authors; in fact, the presence of the cauterized margin compromize minimally the possibility of examining specimens of adequate size; the dimension of the cauterized margin also depends on various factors: the use of only the tomic function of the electroscalpel with the correct setting; the skill of the surgeon who should apply neither pressure or resistance; the speed of incision; the use, when possible, of acicular and thin blades
Thermographic monitoring of nests of nude mice in their early life: technical note
No full textIn this paper IRT (Infrared Thermographic Technique) has provided clear and replicable data about the surface temperature from the first hours of life until 5 days after birth of pups athymic Nude-Foxn1nu (nu/nu and nu/+). We initially hypothesized to use IRT to detect the phenotype of the pups from the very first hours of life, thinking that the presence (in mice nu/+) or absence (in mice nu/nu) of hair follicles could shield or less part of the emitted radiation.
The experimental phase of three months was carried out at the IRCCS Istituto "Mario Negri" in Milan, in compliance with institutional guidelines and international laws. Were used: Mice: 3 females Hsd: Nude-Foxn1nu athymic (nu/+) 6 weeks of age and 3 males Hsd: Nude-Foxn1nu athymic (nu/nu) 6 weeks of age; Cages: 3 IVC ventilated under positive pressure, at 75 air changes hour; Litter: Animal Bedding autoclaved. Usually the litter is changed every two weeks; Food: Global Diet Harlan. Administration ad libitum; Water: autoclaved. Administration ad libitum. Hood Laminar Flow: CS5 changing station.
Thermographic measurements are conducted 2 times per day (10:00 and 14:00). Per nest (mice 0-5 days) we sample 40 images taken in 10 minutes (one image every 15 seconds). For each shot the camera detects two image formats: ".IRI" (thermography) and ".JPEG" (visible) as a control. The instrument display allows to see in real time the quality of the thermographic image. We preferred to make the filming manually (the camera weight about 2 kg). Statistical analysis was performed on the same pool of pups but in a different ages. In the absence of effective thermogenic processes, the differences recorded between the two groups can be attributed to body size. Considering that the surface area decreases with increasing body weight and the heat loss per unit area is approximately constant and independent of the size and stature of the subjects in comparison, metabolic rate normalized to body weight decrease with increasing body weight the biggest-oldest pups lose less heat than littermates. The temperature of the nests (huddle) is very susceptible to the ambient temperature, to the presence of bedding and nest material. The physiological thermoregulation (BAT activity) and behavioral thermoregulation (huddling) do not allow autonomy thermoregulatory but help to slow the dissipation heat; the only way that the pups of 0-5 days of life can increase their body temperature is the transmission of heat from parents
Thermographic monitoring of nestsvof nude mice in their early life: technical note
No full textWe hypothesized to use Infrared Thermographic Technique (IRT) to detect the phenotype of athymic Nude-Foxn1 nu/nu and nu/þ mice from the very first hours of life, assuming that the presence (in nu/þ mice) or absence (in nu/nu mice) of hair follicles could completely shield or partially reduce the emitted radiation.
The experimental phase of three months was carried out at the IRCCS Istituto Mario Negri in Milano, in compliance with institutional guidelines and international laws. Were used: Mice: 3 females Hsd: Nude-Foxn1nu athymic (nu/þ) 6 weeks of age and 3 males Hsd: Nude-Foxn1nu athymic (nu/nu) 6 weeks of age; Cages: 3 IVCages working under positive pressure, at 75 air changes/hour; Bedding: autoclaved hard wood;
Food (Standard Diet Harlan) and water (autoclaved tap water) were administered ad libitum. Hood Laminar Flow: CS5 changing station. Nesting material: autoclaved wooden wool (aspen).
Thermographic measurements were conducted 2 times per day (10:00 and 14:00) starting from day 0 (day of birth) to day 5 in 2 nests (40 images in 10 minutes). For each shot the camera detects two image formats: “.IRI” (thermography) and “.JPEG” (visible) as a control. The instrument display allows
to see in real time the quality of thermographic images thus we preferred to make the filming manually instead of automatically in order to optimize the image’s quality. Statistical analysis was performed on the data obtained by the nests at different ages: day 0, 1, 2, 3, 4 and 5. We were not able to distinguish between nu/nu and nu/þ mice because they stayed all huddled together but we observed an increase in nests temperature between day 0 and day 5 where animals, mainly nude pups, are mostly exposed to heat loss. In absence of effective thermogenic processes, the higher temperature measured in 5 days old nests can be attributed to animals body size. The physiological thermoregulation (BAT activity) and behavioral thermoregulation (huddling) do not allow autonomy thermoregulatory but help to slow the dissipation heat; the only way that the 0 - 5 days old pups can increase their body temperature is the transmission of heat from parents. In this paper we have provided clear and replicable data about the usefulness of IRT in animal welfare monitoring
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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