Search results for " meccanica"

I sistemi di posizionamento GPS in commercio

1998

Un sistema innovativo per il controllo delle gelate

2009

Sperimentazione ed attuazione di un sistema innovativo per il controllo delle gelate in campo.

Injury Evaluation in Teenage Cyclist-Vehicle Crash by Multibody Simulation

2014

Information on impact locations, impact situations and cyclist and pedestrian dynamics in impacts with passenger cars is fundamental for the development of effective solutions to improve cyclist and pedestrian protection. Accidentology research shows that cyclists typically have a higher impact location than the pedestrian, with a larger share of injuries from the windscreen area. Majority of accidents in Palermo, in the last years, happens at urban street (84%) that involve teenager (6.4%). In this paper simulation study captures dynamics and injuries to head and chest for teenager between a generic bicycle and a car model that is suitable for pedestrian or cyclist safety. Multibody simula…

Proposal of a Nomenclature for Hydrogeological Instability Risks and Case Studies of Conservative Soil Tillage for Environmental Protection

2022

In order to implement environmental protection, within the Soil Cadastre, previously proposed as a multipurpose inventory that aims to promote sustainable soil uses, the hydrogeological instability caused by human activities is the focus of this work. These activities can be aimed at sustainable agricultural soil use or the building of roads to allow the access to the fields. The soil’s hydrogeological instability causes the unsustainable use and management of a cadastral parcel. Therefore, the aim of this work is to propose a nomenclature for hydrogeological instability risks, as well as the best practices of conservative soil tillage in case studies, in order to reduce environmental impac…

A survey to evaluate safety in protected crops in western Sicily

2017

Protected crops in the Mediterranean area has reached advanced production systems, but they should solve environmental, energy and money problems. The greenhouse, in fact, is a system characterized by high energy inputs with a reduced environmental sustainability compared to extensive farming and intensive open field. In Sicily, the area dedicated to annual greenhouse cultivation is 8,200 ha with a total number of farms greater than 6,000; although the sector is of great importance in the Sicilian economy, issues as workplace, food and environmental safety are often overlooked. A survey was carried out with the aim of identifying the possibilities to improve environmental, work and food saf…

Automatic Landing System for Civil Unmanned Aerial System

2013

In spite of a number of potentially valuable civil UAS applications The International Regulations prohibit UAS from operating in the National Air Space. Maybe the primary reasons are safety concerns. In fact their ability to respond to emergent situations involving the loss of contact between the aircraft and the ground station poses a serious problem. Therefore, to an efficient safe insertion of UAS in the Civil Air Transport System one important element is their ability to perform automatic landing afterwards the failure. Moreover, the mathematical model of ground effect is usually neither included in the model of the aircraft during takeoff and landing nor in the design requirements of t…

Mathematical Model of Unmanned Aircraft In Ground Effect for Optimal Collision Avoidance

2011

The fundamental aim of the present paper is to model the aerodynamic characteristics of an Unmanned Aerial Vehicle(UAV) flying in ground effect. The second aim is to determine the relationship between the optimal avoidance maneuver and the control to execute it. In fact, this relationship is basilar to the development of a guidance scheme capable of approximating the optimal trajectory in real time. In the first part of this work ,a non-linear model is built in order to model the aerodynamic characteristics of an UAV flying In Ground Effect. To use a single model in the whole range of flying altitude, aerodynamic coefficients are modeled by means of hyperbolic equations. In particular, thes…

Mechanical properties of carbon nanotube fibres: St Venant’s principle at the limit and the role of imperfections

2015

Abstract Carbon nanotube (CNT) fibres, especially if perfect in terms of their purity and alignment, are extremely anisotropic. With their high axial strength but ready slippage between the CNTs, there is utmost difficulty in transferring uniformly any applied force. Finite element analysis is used to predict the stress distribution in CNT fibres loaded by grips attached to their surface, along with the resulting tensile stress–strain curves. This study demonstrates that, in accordance with St Venant’s principle, very considerable length-to-diameter ratios (∼103) are required before the stress becomes uniform across the fibre, even at low strains. It is proposed that lack of perfect orienta…

State of the Art on Degree Study Programs in Agricultural/Biosystems Engineering in EU

2021

The process of international harmonisation of the degree study programs in Agricultural/Biosystems Engineering (ABE) was started by Prof. Giuseppe Pellizzi during CIGR 1989 Conference and was continued by Prof. Pierluigi Febo in EU, within EurAgEng SIG RD12 - Education and Communication, and also within CIGR WG1 - Agricultural Engineering University Curricula Harmonization. Then, four thematic networks were effective: 1) USAEE-TN (University Studies of Agricultural Engineering in Europe - A Thematic Network), comprising 31 HEIs (Higher Education Institutions) from 27 countries, from 2002 to 2006; 2) Consortium POMSEBES (Policy Oriented Measures in Support of the Evolving Biosystems Engineer…

Notes on Elia Ovazza, professor of TMM in Palermo since the end of 19-th century

2013

In this lecture the figure of Elia Ovazza, professor of TMM in Palermo since the end of 19-th century, is presented with a valuable legacy as referring to his activity in teaching, research, design and technology transfer with short biographical notes