Search results for " meccanica"
showing 10 items of 819 documents
Dispositivo di smorzamento del rollio per imbarcazioni all’ancora o alla deriva con motori spenti
2015
La presente invenzione si riferisce ad un nuovo dispositivo di smorzamento del rollio, inseribile e disinseribile, per imbarcazioni all’ancora o alla deriva con motori spenti. Novel roll damping device for a vessel, in particular when the vessel is anchored or drifting with the engines off
Joint Influence of Transverse Compression and Shear-Flexural Stiffness on Rubber V-Belt Mechanics
2009
The elasto-mechanical behavior of a rubber V-belt in the neighborhood of the seating and unseating regions of the pulley is affected by the transverse belt compliance, which produces a gradual radial penetration into the groove and by the shear-flexural deformation, which arches the belt line along the free strand away from the ideal straight path. These effects are always analyzed separately in the literature, but are in close correlation with each other. This lecture describes the matching between the free strand and the wrap region, showing a remarkable reduction of the belt arching and of the contact losses, with respect to the conventional theory.
Valutazione della vita a fatica di giunti complessi saldati tramite Friction Stir Welding
2010
On the biomechanical function of scaffolds for engineering load-bearing soft tissues
2009
Replacement or regeneration of load-bearing soft tissues has long been the impetus for the development of bioactive materials. While maturing, current efforts continue to be confounded by our lack of understanding of the intricate multi-scale hierarchical arrangements and interactions typically found in native tissues. The current state of the art in biomaterial processing enables a degree of controllable microstructure that can be used for the development of model systems to deduce fundamental biological implications of matrix morphologies on cell function. Furthermore, the development of computational frameworks which allow for the simulation of experimentally derived observations represe…
Functional design of power-split CVTs: An uncoupled hierarchical optimized model
2017
Abstract This paper provides a new model for the preliminary design of compound power-split CVTs. Unlike the existing models, the presented method allows the engineers to prioritize functionality and efficiency of the transmission, while delaying the choice of the involved gear sets’ layout as long as possible. The design approach follows a specific priority order, and each step deals with one particular issue, without mutual interference. A smart design-chart eases the assessment and the comparison of the only eligible alternatives, and eventually leads to a final feasible constructive scheme, which can be an excellent concept for further optimization and implementation. Moreover, the mode…
A closed-form solution for natural frequencies of thin-walled cylinders with clamped edges
2016
Abstract This paper presents an approximate closed-form solution for the free-vibration problem of thin-walled clamped–clamped cylinders. The used indefinite equations of motion are classic. They derive from Reissner׳s version of Love׳s theory, properly modified with Donnell׳s assumptions, but an innovative approach has been used to find the equations of natural frequencies, based on a solving technique similar to Rayleigh׳s method, on the Hamilton׳s principle and on a proper constructions of the eigenfuctions. Thanks to the used approach, given the geometric and mechanical characteristics of the cylinder, the model provides the natural frequencies via a sequence of explicit algebraic equat…
"Agrointernational Quality" per favorire l'internazionalizzazione delle aziende agricole Siciliane
2012
Le aziende di piccole e medie dimensioni spesso non riescono ad intervenire attivamente nei mercati internazionali, per cui si rende necessario che le transazioni siano rese più semplici e veloci, mediante, la riduzione delle formalità e l’armonizzazione delle procedure amministrative e commerciali. In altri termini occorre attuare una “trade facilitation”, cioè la semplificazione e l’armonizzazione delle procedure e dei flussi informativi, mediante lo sviluppo di software multimediali e di portali web, in grado di fornire alle imprese agricole informazioni e soluzioni applicative sulla normativa, sulle procedure, sulla documentazione accompagnatoria (sia qualitativa che fiscale), sulle sch…
Meccanizzazione dei vigneti e degli oliveti nelle aree a forte declività o terrazzate. Il caso Pantelleria. Un'analisi tecnologica e socio-economica
2008
A low-cost multispectral imaging system for the characterisation of soil and small vegetation properties using visible and near-infrared reflectance
2022
Current Proximal Sensing technologies are based on multispectral imaging systems able to capture images in a few spectral bands, usually centred in VIS and NIR regions, to derive vegetation indices. However, most of such systems lack an internal radiometric calibration to estimate the actual reflectance of the observed target, making them sensitive to the local radiative environment and requiring a per-session calibration against a reference target. To overcome such dependence, the instrument described adopts an active illumination of the target surface, allowing the monitoring of soil and low vegetation surfaces by a radiometrically pre-calibrated imaging camera. The system, driven by a mi…
Metodo per il monitoraggio di superfici vegetali
2019
Si descrive un metodo da impiegare per la caratterizzazione delle coperture vegetali. A method to be used for the monitoring of vegetation surfaces is described, which includes the use of a device for measuring the spectral reflectance of vegetation using images acquired with a lightening system based on visible and infrared monoband LEDs and including devignetting, image cropping, radiometric calibration procedures and calculation of reflectance values and vegetation indices.