1,721,007 research outputs found
La gestione dei rifiuti e dei reflui negli allevamenti avicoli: aspetti legislativi e impiantistici
No full textNella presente trattazione si è affrontato un problema annoso per gli operatori del settore avicolo, cioè quello dello smaltimento dei rifiuti prodotti negli allevamenti.
Partendo da aspetti impiantistici e legislativi generali, sono stati definiti tutti i rifiuti di possibile produzione nell’allevamento avicolo, compresi quelli biologici, sanitari e gli imballaggi. Per ognuno di questi, quindi, sono state individuate le opzioni di smaltimento consentite dalla normativa vigente; una trattazione analoga è stata effettuata relativamente ai reflui.
L’analisi del settore evidenzia che, con uno studio specifico del ciclo produttivo dell’allevamento ed una conoscenza approfondita della legislazione vigente, è possibile trovare la soluzione più efficace ed economicamente vantaggiosa per l’allevatore, con il minimo impatto ambientale; le leggi in vigore tendono a promuovere il recupero dei rifiuti e il riciclo dei reflui, destinando solo minime parti allo smaltimento o alla depurazione mediante metodologie che potrebbero risultare passive ed onerose per i singoli e per la collettività. Pertanto, le soluzioni impiantistiche e operative da adottare per la progettazione di nuovi allevamenti, o per l’adattamento di quelli pre-esistenti devono essere studiate con questa filosofia.
D’altra parte, nel settore agro-alimentare l’esigenza di una conoscenza approfondita delle problematiche tecnico-legislative è particolarmente avvertita, in quanto l’interpretazione della normativa risulta molto meno immediata, in relazione al confine più labile che sussiste fra i sottoprodotti, gli scarti, i rifiuti ed i reflui che si possono produrre
A novel signal processing method for TSA applications
No full textA novel development of the thermoelastic stress analysis (TSA) technique for testing mechanical components under the random load condition is presented. The method proposed does not need a reference signal to reduce the amount of noise in the thermoelastic images, allowing an easier application of the TSA to the real working condition of mechanical components. Noise is filtered out by means of a numerical algorithm based on the hypothesis that a random thermoelastic signal can be approximated with a harmonic signal. Some notched specimens under the pseudo-random load condition have been tested using either the proposed method or a commercial one (DeltaTherm. data processing procedure). Results obtained with both methods are in good agreement
Comparison of local strain measurements done by strain gage and differential thermographic technique
No full textGoing 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
On the feasibility of thermoelastic stress analysis on rapid prototyping models
No full textThis work discusses application of the thermoelastic technique to the stress analysis of Rapid Prototyping (RP) models. The aim is to evaluate the possibility of conducting complete and effective structural tests on prototypes made by means of stereolithography (SLA). The analyzed material is an RP Cure 600 ND epoxy resin. A statistical approach was followed to evaluate the sensitivity of the thermoelastic behaviour of the material to some SLA characteristic parameters. In addition, the effect of load cycle frequency on thermoelastic signal was also analyzed. The experimental work included forty-eight tests on ASTM standardized specimens. A new testing procedure was developed for resin-made models. The new method is based on the application of a loading ramp to SLA standard specimens and on the acquisition of the infrared signal. The thermoelastic constant K is determined using the thermographic signal temporal slope. Results for an engine bracket are presented in the paper
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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