1,721,016 research outputs found
Valutazione di una modifica dell’attuale sistema di campionamento di polveri di legno duro
No full textIn questo lavoro è stata studiata una modifica originale del selettore IOM a tutt’oggi previsto dalle metodiche per la determinazione delle esposizioni professionali a polveri di legno duro.
I risultati sin qui ottenuti sono incoraggianti, in quanto eliminano o riducono fortemente la sovrastima – segnalata a suo tempo da uno degli autori e da altri ricercatori – tipica del selettore IOM nel caso di uso di macchine da taglio legno veloci e che rappresenta una fonte di errore notevole nelle determinazioni analitiche.
Il problema della determinazione della esposizione a polveri di legno duro è sicuramente di attualità, in considerazione dei seguenti aspetti:
- Classificazione delle polveri di legno duro come cancerogeni, ribadita nell’allegato XLII del D. Lgs. 81/2008;
- Esistenza di un valore limite ponderato sulle otto ore lavorative, ora contemplato dall’allegato XLIII dello stesso decreto, oggetto di severe e fondate critiche per il livello considerato eccessivamente elevato (5 mg/m3 riferito alla frazione inalabile), pur considerando il significato estremamente relativo di un valore limite professionale per cancerogeni;
- Criticità nella determinazione della frazione inalabile aerodispersa di polveri di legno duro in funzione dei vari sistemi di campionamento segnalata in diverse ricerche
Air and bone conduction brain stem responses in adults and infants
No full textAir and bone conduction brain stem responses were recorded in 20 adults and 20 infants (16-20 months postconceptional age) with normal hearing. The stimuli were administered using a shielded TDH-39 headphone and a standard B-70A vibrator. Our results show that adults and infants have similar air and bone conduction brain stem thresholds. The comparison of input latency functions obtained with air and bone conduction clicks indicates that the acoustic stimulus generated by the bone vibrator excites more apical regions than that stimulated by the air conduction transient. This is related to the spectrum of the bone conduction click which has an energy peak at 1-2 kHz. Furthermore we found that the difference in latency between adults and infants for air-conducted clicks decreases along with the stimulus intensity and the latencies tend to overlap near the threshold
Il traffico illecito di rifiuti
No full textIn the light of European regulatory changes, the conduct of illicit waste traffic has undergone significant changes. Interesting consequences result in tenuity of the fact
Abbandono di rifiuti
No full textThe abandonment of waste is a phenomenon that is difficult to control. First of all, there is no certain definition of abandonment and the nature of the concept of waste changes over time. Furthermore, the perpetrators of the crime often remain unknown and the cost of the intervention rests on the administrations. Particularly interesting are the consequences in terms of tenuousness of the fac
Valutazione delle caratteristiche fenomenologiche e psicopatologiche della tricotillomania in un gruppo clinico
No full textDichotic performance of Italian subjects tested with English and Italian stop consonant-vowel stimuli
No full text15 normal-hearing, right-handed Italian subjects were tested dichotically with Italian and English stop consonant plus vowel combinations (CVs). The stimuli were modified on a computer-based routine so that the pre-voicing of Italian voiced CVs was 30 ms long. In this condition, a significant right-ear advantage and a consistent lag effect were observed with both Italian and English stimuli. In addition, no significant differences between the two types of stimuli (English and Italian) were observed in the dichotic performances (except when using the 90-ms lag, which resulted in a significant difference in performance)
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
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