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Confronto tra fissazione transcondilica metallica e riassorbibile nella ricostruzione del LCA con semitendinoso e gracile duplicati. Studio prospettico randomizzato
No full textFEM Analysis of ROPS for Agricultural Self-Moving Machines
No full textThe high number of accidents due to a rolling over of agricultural machineries increases the interest of researchers and organisations for standardisation in this field. In the Fifties, standards to test rolling over protective structures (ROPS) for tractors were designed and approved, the same was not defined for agricultural self-moving machines. In the present work an analysis of different categories of agricultural self-moving machines is executed with the goal of evaluating the possibility to introduce ROPS solutions used in tractors. Three categories of agricultural self-moving machines were chosen in function of their dimensions, mass, operations performed, and their diffusion on the Italian and European market. On each machine, an evaluation of the capability to adopt a solution to protect the conducers from rolling over, like to tractors, was analysed. The ROPS design was obtained using a dedicated software to evaluate the resistance of the structures installed at the moment to protect conducers only from environmental aspects, and to design structures able to resist the load cycle imposed by the standards. The results have shown a low resistance level of the structures used at the moment on the machines chosen for the tests. The structures able to sustain the loads imposed by the standards are not too different with regards to dimensions, but an increase of the resistance of the materials or an increase of the thickness of the mountings is necessary
Attività di Plodia interpunctella(Hbn.) nelle fasi di produzione e stoccaggio di un prodotto dolciario
No full textVarious aspects concerning possible infestations of Plodia interpunetella (Hbn.) in a confectionery product (panforte) have been evaluated, such as: susceptibility of ingredients and finished product, survival of eggs inside the packing, and resistance of the package to the insect attack. P. interpunctella shows a strong ability to develop on almonds and pistachios while it cannot reach the adult stage on candies, powdered sugar and spices mixture. Therefore, panforte without candies and the one without dusting with powdered sugar are the most susceptible to the development of the moth, compared to the traditional one. Survival of the eggs, during the cooling phase, is observed when the temperature of panforte surface is 40°C. The packing of panforte is composed of: a primary wrapping of polycoupled [PET(12μm)-Al(8,5μm)-LDPE (60μm)]; a box in thin cardboard; a thermoretractable covering (PVC). Packaging in polycoupled shows a sufficient mechanical resistance if attacked from outside, while it can be pierced from inside near the welds. The outer covering in PVC, if properly welded, prevents larvae from entering
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
Evaluation of testing procedures for ROPS fitted on self-propelled agricultural machinery
No full textFatalities and serious injuries resulting from rollover accidents involving tractors and self-propelled agricultural machinery often occur in the field. Since 1974 tractors have been fitted with Roll-Over Protective Structure (ROPS) according to the requirements of the EC directive 74/150 EEC. On the contrary rollover protection of the driver was not required for self-propelled agricultural machinery until recently. The recognized potential risk of rollover for these machines, currently considered by the EC Directive 2006/42/EC, has led to manufactures implementing ROPS on new or existing self-propelled agricultural machinery, such as grape harvesters and sprayers. Consequently there is a need to develop standard strength tests for these applications. Nowadays ROPS tests involving agricultural machinery are carried out according to the ROPS testing procedure studied for tractors and/or earth-moving machinery.
An evaluation of the applicability of the tractor OECD ROPS Codes 4 and 8 to rollover protective structures retrofitted on in-use grape harvester was performed and the strength test results are presented and discussed.
The results showed that the Code 8 procedure was more suitable for evaluating the strength performance of the ROPS retrofitted on the tested grape harvesters. However the results demonstrated also some points where the testing procedures need to be modified in order to match the specific characteristics of the machinery considered
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