1,720,959 research outputs found
Disturbi soggettivi in operatori addetti dalla Risonanza Magnetica (RM): risultati preliminari in un campione pilota
No full textINTRODUZIONE
Alcuni studi nel personale addetto alla Risonanza Magnetica (RM) suggeriscono un’aumentata prevalenza di alcuni sintomi soggettivi quali sensazione di sapore metallico, vertigini e sensazione di movimento, nausea e cefalea, ed un possibile effetto su alcuni test neuro-comportamentali e neurofisiologici, reversibili dopo interruzione dell’esposizione (1,2,3,4). I dati sono però moto limitati. In questo lavoro presentiamo uno studio che stiamo avviando su tali sintomi in addetti alla RM, ed alcuni dati preliminari raccolti in un gruppo pilota per testare lo strumento.
MATERIALI E METODI
E' stato somministrato un questionario sulla presenza di disturbi soggettivi quali: sensazione di sapore metallico, vertigini e sensazione di movimento, nausea e cefalea, formulato sulla base dei risultati di precedenti studi. Verrà studiata l’esistenza di una relazione tra la prevalenza e l’intensità dei sintomi e l’entità e la durata dell’esposizione. I dati saranno confrontati con un gruppo di controllo. In questa sede vengono presentati alcuni risultati di un test preliminare di fattibilità.
RISULTATI
Sono stati raccolti 28 questionari, 15 partecipanti di sesso maschile e 13 di sesso femminile, tutti addetti a RM di potenza variabile da 1 Tesla (T) a 3T. La durata dell’attività lavorativa con apparecchiature RM è risultata molto variabile, da 1 a 22 anni (media 5,2 anni ± 5, DS).
Con questa premessa, sono riportati i dati sui sintomi soggettivi riferiti: delle 28 persone studiate, ben 25 hanno riferito di aver avuto, nel corso dell’ultimo anno, almeno uno dei sintomi indagati. Solo 6 operatori li hanno lamentati almeno una volta alla settimana, e solo 4 si sono fatte visitare da un medico a causa di tali disturbi. I sintomi più frequenti sono risultati: nausea (3 lavoratori), mal di testa, capogiri/vertigini e sonnolenza inusuale/stanchezza (2 lavoratori). 5 operatori ritenevano che la sintomatologia potesse essere causata/aggravata dal lavoro nei locali della RM. Per quanto riguarda il tempo richiesto per la regressione dopo l’allontanamento, nella maggioranza dei casi la comparsa avveniva dopo pochi minuti dall’inizio dell’esposizione, e la regressione entro 15-30 minuti.
CONCLUSIONI
Viene presentato uno studio mediante questionario, basato sui dati della letteratura più recente, volto ad indagare la prevalenza ed intensità di sintomi soggettivi in addetti alla RM. Le domande che vengono poste sono analoghe a quelle contenute in questionari in corso di raccolta in altre Nazioni Europee, in modo che i risultati siano confrontabili. Sono anche presentati i risultati di un test preliminare di fattibilità del questionario, basato sulla somministrazione in un gruppo di 28 volontari, non considerabili rappresentativi per la modesta numerosità e la modalità di raccolta
Linee Guida per la sorveglianza sanitaria dei lavoratori esposti a campi elettromagnetici
No full textTHE INDICATIONS OF THE ITALIAN ASSOCIATION OF MEDICAL RADIATION PROTECTION (AIRM) FOR THE HEALTH SURVEILLANCE OF WORKERS EXPOSED TO IONIZING RADIATION
No full text
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
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
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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