1,721,032 research outputs found
Application of the Network Psychometric Framework to Measurement Burst Designs
No full textNetwork Psychometrics emerged in the last years as an approach that allows investigating how different elements of a system interact and how these interactions change across occasions. The present work aims to show the potentialities of the Network Psychometric framework to examine the stability of dynamics of change of psychological processes. Specifically, we tested the applicability of the recently introduced psychonetrics toolbox to (a) model within-subjects (both contemporaneous and temporal) and between-subject (stable individual differences) dynamics with data collected with a measurement burst design (MBD, two 14-day bursts); and (b) examine the temporal stability (or instability) of the process’ dynamics by directly comparing the two bursts in terms of both within and between parameters’ invariance. The illustrative example was about the process of meaning-making, whose dynamics of change were examined across two different contextual conditions during the COVID-19 pandemic. A step-by-step procedure to apply psychonetrics to MBDs is provided in an Open Science Framework project
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
Sensory analysis of virgin olive oil by means of organoleptic evaluation and electronic olfactory system
No full textDispelling 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
Alchil esteri e composti correlate in oli d'oliva vergini: loro evoluzione nel tempo
No full textThe quantitative determination of alkyl esters in extra virgin olive oil has been adopted in Europe by Reg. (EU) No 61/2011 as an official quality parameter, after being previously adopted by the International Olive Council (IOC), after a collaborative experimentation. The adoption of the limit aroused a lively debate, while for some it was considered too high, others reported the possibility of an increase of alkyl esters over the storage time of the oil. To investigate the matter, the "Società Italiana per lo Studio delle Sostanze Grasse" (SISSG - Italian Society for Fat Researchers) organized an experimental study in cooperation with several Italian olive oil companies: each one giving samples, filtered or not filtered, in bulk or bottled, of different origins. 18 samples of oil (13 in bulk and 5 bottled) were stored for 1 year. Every three months a number of analytical parameters were carried out to determine their quality: moisture, insoluble impurities, methyl esters, ethyl esters, methanol, ethanol, peroxide value, free acidity, UV absorption and sensory evaluation (panel test). All the analytical evaluations, with the exception of methanol and ethanol content (cited procedure), were carried out according to IOC, ISO or EU Official methods. The results highlighted that, within the samples used for this research, the concentration of ethyl alcohol was usually higher in Spanish oils (30-90 mg/kg) rather than Italian ones (1, 2-10, 5 mg/ kg), also free methanol was generally lower (never higher than 16, 5 mg/kg). The same trend has been observed for the fatty acid ethyl and methyl esters. It was also observed, only in oils containing amounts of ethanol and methanol respectively higher than 20 and 10 mg/kg and particularly for those of a low quality (virgin from the beginning of the study), had a relevant rise of alkyl esters during storage. On the contrary, it should be highlighted that samples of a high quality (characterized at T0 by a low content of ethyl esters) present, at the beginning and over the time of the study, amounts of free ethanol lower than 10 mg/kg (0, 3 mill mol) did not show any increment of ethyl esters during the conservation. Free acidity, even if different in the oil samples, seemed not to be a limiting or promoting factor for the esters increasing, suggesting that they could be both generated by ethanol or methanol esterification (with fatty acids) or transesterification (with triglycerides or partial glycerides). The formation during the conservations of ethyl and methyl esters appeared to be strongly related with the concentration of free alcohols in the oils, and, as long as ethanol can be solely produced by fermentation, ethyl esters are confirmed, between the two, the most important markers to determine the oil quality. This study confirms that the recent decision of IOC to delete the parameters "methyl esters" and related limit, as well as the "ratio ethyl esters/methyl esters" and maintain ethyl esters only, in the meantime lowering the limit . The occurence of ethyl esters infact, as well as free ethanol are markers of fermentation (low quality of olive fruits and of the extracted oil). Further studies are needed: - to verify the exact mechanism/s of esters formation in oil, - what are the limits of the related volatile compounds (in particular, ethanol and ethyl acetate) that can be suggested for extra virgin olive oils, - the most robust and simple method that should be used to determine these diagnostic volatiles
VIRULENCE-ASSOCIATED GENES IN AVIAN PATHOGENIC ESCHERICHIA COLI FROM LAYING HENS IN APULIA (SOUTHERN ITALY)
No full text1. Escherichia coli isolated from lesions (Avian Pathogenic E. coli - APEC) of layer hens affected by colibacillosis and from intestinal contents of clinically-healthy birds (Avian Faecal E. coli - AFEC) were serotyped. All the isolates were investigated for the presence of virulence genes to determine which genes were more closely related to those from lesions. 2. A number of different serogroups were detected, O78 being predominant among the isolates from colibacillosis. 3. E. coli isolated from lesions were not linked to a specific pathotype (set of common virulence genes). 4. The presence of the virulence genes, with the exception of astA, was associated more generally with APEC strains. 5. Statistically, genes such as cva/cvi, tsh, iss, irp2 and iucD were more related to isolates from colibacillosis. 6. It is suggested that the detection of these genes in a rapid and inexpensive test for field practitioners could provide useful information about the potential virulence of E. coli isolated in commercial layer flocks
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