Search results for " meccanica"
showing 10 items of 819 documents
Positioning Accuracy Comparison of GNSS Receivers Used for Mapping and Guidance of Agricultural Machines
2020
Global Navigation Satellite Systems (GNSS) allow the determination of the 3D position of a point on the Earth&rsquo
Confronto energetico e produttivo tra diverse tipologie di minicaseifici.
2011
Confronto energetico e produttivo tra diverse tipologie di minicaseifici.
Consumi energetici in diverse tipologie di minicaseifici
2001
Recent regulations about the food health and safety and methods of milk processing obliged most sheep farmers not to process it on their own. Therefore, in Sicily most sheep breeders sold their milk to some small dairies. On the contrary, if sheep breeders had modern plants for processing also small amounts of milk in some suitable farm rooms, they could earn the additional value, due to cheese and ricotta sale. The agricultural Mechanics and Food Industry Sections of the Department of Engineering and Technologies in Agriculture and Forestry (ITAF) of Palermo University measured and assessed the consumptions of fuel electrical energy in some small dairies of 200 and 300 l capacity, in order…
Consumi energetici in diverse tipologie di minicaseifici
2001
Innovation for the Italian agricultural and food industry sector
2020
The food industry is one of the largest energy consumers in the world, with 95 EJ/year. In this context, in Europe the amount of energy needed to cultivate, process, package and bring food to the homes of citizens reached 285 Mtoe in 2015, of which 14 Mtoe due to the Italian agricultural and food system. With the aim of favoring a drastic reduction in energy consumption, the European Commission, and the main international agencies, ie: FAO, OECD, UN over the last decade have aligned on the need to develop policies to support energy efficiency, renewable energies and sustainable technologies in order to minimize the use of fossil fuels and to reduce the final energy consumption, especially i…
Three-mode pneumatic management of marine U-tank systems
2012
Abstract This paper deals with a new pneumatic control strategy for the roll damping enhancement of marine U-tank stabilizers. The proposed technique consists in a three-mode operation, where the control is active only within a limited resonant range around the ship natural frequency, whereas the control valves are kept closed in the remaining frequency range. Moreover the connection valve between the two air chambers is either closed or partially opened for the low or high frequencies, respectively. The pressurized air for the active control is fed by a turbo-blower set aboard and operates accelerating the motion of the water mass in the U-duct. The theoretical analysis is conducted in the…
Il paesaggio urbano come strategia di comunicazione
2014
Convegno Nazionale A.I.D.T.P.G.
Coupling Mechanics of Antikythera Gearwheels
2012
This paper discusses the gear coupling mechanics of the ancient Antikythera mechanism, among whose distinctive characteristics was the triangular shaping of the teeth. The engagement of the tooth pairs is analyzed in detail, estimating the temporal variation of the speed ratio due to the back and forth shifting of the relative instant center. The admissibility of the theoretical contact points is carefully checked, and the magnitude of the successive tooth collisions is calculated together with the energy losses arising from the particular nature of the coupling. Some interesting results are that only one tooth pair turns out to be active at each time instant and the real path may belong on…
Approximate Closed-Form Solutions for the Shift Mechanics of Rubber Belt Variators
2009
The mechanical behavior of V-belt variators during the speed ratio shift is different from the steady operation as a gross radial motion of the belt is superimposed to the circumferential motion. The theoretical analysis involves equilibrium equations similar to the steady case, but requires a re-formulation of the mass conservation condition making use of the Reynolds transport theorem. The mathematical model of the belt-pulley coupling implies the repeated numerical solution of a strongly non-linear differential system. Nevertheless, an attentive observation of the numerical diagrams suggests simple and useful closed-form approximations for the four possible working modes of any pulley, o…
Biodiversity and dairy traits of lactic acid bacteria from foliage of aromatic plants before and after dehydration process monitored by a smart senso…
2020
ABSTRACT The main hypothesis of this work was to evaluate the presence of lactic acid bacteria (LAB) intrinsically resistant to plant essential oils in sage (Salvia officinalis L.) and laurel (Laurus nobilis), for future applications in functional cheese production by addition of aromatic herbs. The effect of the drying process on the viability of LAB was evaluated with three biomass densities (3, 4 and 5 kg/m2). The drying densities did not affect weight loss, but influenced the levels of LAB of sage and laurel. A total of 10 different strains of Enterococcus faecium, Enterococcus mundtii, Enterococcus raffinosus and Leuconostoc mesenteroides were identified from laurel, while sage did not…