Search results for " meccanica"
showing 10 items of 819 documents
Evaluation of the efficiency of different harvesting methods of olives
2006
This paper reports the results of experimental tests carried out in Sicily about the harvesting of olives. Three varieties were selected (Biancolilla, Cerasuola and Nocellara del Belice); the tests were performed in three different periods with three different harvesting systems: manual, manual with pneumatic combs and mechanical harvesting. The aim of this study was to evaluate the work capacity and productivity of the three harvesting systems and the period maximising the mechanical harvesting efficiency. The damages caused to the trees after mechanical harvesting with a variable frequency shaker were also evaluated. Naturally fallen olives, Jean’s maturity index, detachment force, harves…
The Recovery of the Optimal Damping Constant by the MRF Damper
2009
In this paper was studied a method to analyze the recovering of optimal damping constant because of temperature increasing in a shock absorber. The increasing on temperature leads to decreasing that constant by mean dynamic viscosity such to modify the dynamic behavior of a 2DOF system built-up by sprung and unsprung mass. A MagnetoRheological damper was designed according with the desired optimal damping constant once fixed temperature design. It was seen that the increasing of temperature this constant is lost. As MagnetoRheological-Fluids allows us to increase the viscosity, we use a control signal by a state feedback of reduced order to create a such magnetic induction field to recover …
Speciale CRA: il rapporto Oxfam
2014
oxfam
Pane buono, ma con meno sale
2016
articolo redazionale
Il patentino per la conduzione delle macchine agricole
2013
Il patentino per la conduzione delle macchine agricole
Effect of different soil management in sloping vineyards on soil penetration resistance.
2013
In environments characterized by steep slopes or arranged in terraces, among the shallow tillage systems, rototilling is extensively used. However, the effect of the repeated use of rototilling has a considerable influence on soil characteristics; it appears finely powdered, soft and without structure. In order to limit these inconveniences, an innovative self-propelled machine equipped with working tools as a spade, to be used in steep slopes or arranged in terraces areas, was designed by the Mechanics Section of the SAF (Scienze Agrarie e Forestali) Department of the University of Palermo in cooperation with Agrotec company, Padua, Italy. The aim of this study is to compare the effects of…
Soil physical-mechanical properties evaluation in different tillage systems
2014
In environments characterized by steep slopes or arranged in terraces, among the shallow tillage systems, rototilling is extensively used. However, the effect of the repeated use of ro-totilling has a considerable influence on soil characteristics; it appears finely powdered, soft and without structure. In order to limit these inconveniences, an innovative self-propelled machine equipped with working tools as a spade, to be used in steep slopes or arranged in terraces areas, was designed by the Mechanics Section of the Department of Agricultural and Forest Sciences, University of Palermo, in cooperation with Agrotec company, Padua, Italy. The aim of this study is to compare the effects of t…
Simona Romagnoli madrina della marmellata di pere e limoni
2014
possibilità della trasformazione di alcune varietà di pere in marmellata
Design of a Hybrid Electric Power-Split Transmission for Braking Energy Recovery in a Drilling Rig
2022
Despite the promising potential of the hybrid electric power-split layout, its broader market penetration is prevented by the large number of feasible solutions and the constructive complexity, which overcomplicate the design process. Moreover, due to the lack of relevant literature references, the power-split transmissions design is even more difficult if concerning applications outside the automotive and agricultural sectors. In this paper, a general parametric model already available in the literature to design a single-mode power-split transmission with up to two planetary gear sets and six ordinary gear sets was applied to hybridize an oil drilling rig to recover energy braking during …
Precison Farming: l’Agricoltura 4.0
2016
Relazione presentata a Bologna il 9 novembre, presso il palazzo dei Congressi dell’Ente Fiere di Bologna, in occasione della 42esima manifestazione dell’EIMA, il Corso per Giornalisti dell’UNAGA dal titolo: ” Ruolo e responsabilità del giornalista nel promuovere la lotta allo spreco attraverso l’utilizzo delle nuove tecnologie”