1,721,304 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
Determination of β-agonists in urine samples at low μg/kg levels by means of pulsed amperometric detection at a glassy carbon electrode coupled with RP-LC
No full textA method for the determination of β-agonists was developed by combining the separation of analytes through high-performance liquid chromatography, with a reversed-phase column, coupled to the pulsed amperometric detection at a glassy carbon electrode. Preliminary experiments, using cyclic voltammetry, allowed for an understanding of the electrochemical behavior of clenbuterol, fenoterol, and terbutaline. By analyzing the electrochemical response, the conditions for detecting the analytes and for cleaning the working electrode were identified. The proposed potential-time profile was designed to prevent contamination of the carbon electrode following consecutive analyses, so ensuring a reproducible and sensitive quantitative determination. The waveform electrochemical parameters, including detection and delay times, have been optimized in terms of sensitivity, detection limits, and long-term response stability. The chromatographic separation was carried out using a C8 column in isocratic mode, and a mixture of acetic acid and acetonitrile. The optimized experimental conditions were used for the analysis of standard solutions and real samples. Detection limits, lower than the maximum residue limit set for clenbuterol by European directives, were obtained for all β-agonists investigated. The method validation was performed by evaluating the linearity, selectivity, precision, and recovery. Calf urine samples were used to verify the applicability of the proposed method, analyzing both enriched and naturally contaminated urine samples
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
Chemometric discrimination of X-ray irradiated mozzarella cheese based on the volatile profile by HS-SPME/GC-MS
No full textChemometric discrimination of X-ray irradiated mozzarella cheese
based on the volatile profile by HS-SPME/GC-MS
Zianni R.
1, Mentana A.2, Campaniello M. 2, Tomauiolo M. 2, Iammarino M.2, Centonze
D.3, Palermo C.1
1 Università di Foggia, Dipartimento di Medicina Clinica e Sperimentale, Via Napoli 25 - 71122 Foggia, Italy 2 Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata, Laboratorio Nazionale di Riferimento per il
trattamento degli alimenti e dei loro ingredienti con radiazioni ionizzanti, Via Manfredonia, 20 - 71121 Foggia, Italy
3 Università di Foggia, Dipartimento di Scienze Mediche e Chirurgiche, Via Napoli 25 - 71122 Foggia, Italy
AIM X-ray irradiation is a non-thermal technology employed to destroy and inactivate
pathogen and microbial contaminants in foodstuffs. To date, few analytical investigations have
been carried out on volatile profile of X-ray irradiated dairy products (Zianni et al., 2022). For
this reason, in this work, a Central Composite Design (CCD) for Response Surface
Methodology (RSM) was employed to optimise the HS-SPME parameters for investigating the
volatile organic compounds (VOCs) of irradiated mozzarella cheese. The best conditions were
applied to non irradiated and irradiated samples at three dose levels (1.0, 2.0 and 3.0 kGy),
the differences have been evaluated by means of a chemometric discrimination.
MATERIAL AND METHODS The X-ray radiation treatment was performed using a lowenergy X-ray irradiator. VOCs were sampled by HS-SPME and analysed by GC-MS.
The collected data were handled by Principal Component Analysis (PCA), Linear Discriminant
Analysis (LDA) and Partial Least Square-Discriminant Analysis (PLS-DA), to discriminate the
variation of volatile profiles among non-irradiated and irradiated samples.
RESULTS LDA and PLS-DA demonstrated that the X-ray irradiation treatment differently
affected the volatile classes of aroma mozzarella cheese. The results highlighted the
effectiveness of the volatolomic approach to evaluate the variations with respect to the
irradiation and to identify potential markers of X-ray treatment.
Keywords: Experimental design, Statistical analysis, Food irradiation, Volatile organic
compounds, HS-SPME/GC-MS
Contact person: Rosalia Zianni, [email protected]
ACKNOWLEDGMENT
Supported by funding from the Italian Ministry of Health, Project code GR-2018-
12367064.
REFERENCES
Zianni R (2022): An investigation using a validated method based on HS-SPME-GC-MS
detection for the determination of 2-dodecylcyclobutanone and 2-tetradecylcyclobutanone in Xray irradiated dairy products. LWT - Food Science and Technology, 153, 112466. doi:
https://doi.org/10.1016/j.lwt.2021.11246
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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