Nonlinear control of multibody flexible mechanisms: A model-free approach

In this paper a novel nonlinear controller for position and vibration control of flexible-link mechanisms is introduced. The proposed control strategy is model-free and does not require the measurement of the elastic deformation of the mechanism, since the control relies only on the knowledge of the angular position of the actuator and on its time derivative, which can be measured simply with a quadrature encoder. The conditions for the closed-loop stability are evaluated using Lyapunov theory. The performance of the proposed technique is evaluated on a four-bar flexible-link mechanism. Superior vibration damping and more accurate trajectory tracking is obtained in comparison with a PD controller and a fractional order controller, which relies on the same set of measurement as the proposed nonlinear controller

Risk management in solitary agricultural work: new technologies for handling emergency and falls from great heights (SHADE)

Solitary work and agricultural activities are the scenarios of a large number of severe injuries and deaths, also because first aid may be difficult to achieve in isolated locations. This work proposes a technology available on smartphones that allows triggering an emergency call when a fall from height or an unconsciousness state is detected. The results of several tests, which include different detection algorithms and scenarios, are reported in this work. Tests performed with the aid of a dummy have allowed developing a reliable algorithm for the detection of dangerous situations. This system is available as an Android application

Coastal zone evolution of the Marche Region (Adriatic Sea-Italy)

Coastal zon

THE EVOLUTION OF THE MARCHE REGION COASTAL ZONE (ADRIATIC SEA) AND THE CLIMATE CHANGE

non disponibil

Tooth Extraction in Patients on Oral Anticoagulants: Prospective Study Conducted in 108 Brazilian Patients

Introduction. Dental treatment performed in patients receiving continuous oral anticoagulant drug therapy is becoming increasingly common in dental offices. For these patients it is imperative to carry out careful anamnesis, as well as a multiprofessional clinical evaluation with regard to the risk and control of hemorrhagic or thromboembolic episodes. Objectives and Material and Methods. The aim is to evaluate postextraction hemorrhagic or thromboembolic episodes in patients who have been on anticoagulant medications for an uninterrupted period of 48 months. Results. Among the 108 patients evaluated, 215 extractions were performed in which there was only one case of postoperative bleeding. Warfarin was used by 98 patients; Warfarin associated with salicylic acetic acid by 9 patients and salicylic acetic acid in only 1 patient. As regards the serologic tests performed, International Normalized Ratio (INR) ranged from 0.8 to 4.9, with a mean of 3.15. Conclusion. Extractions in patients on oral anticoagulants must be performed in the least traumatic manner possible. It is not necessary to stop anticoagulant therapy to perform extractions. Local hemostasis techniques, such as obliterative sutures alone are sufficient to prevent hemorrhagic complications

Prospects for detecting Gamma-Ray Bursts with the Cherenkov Telescope Array

The Large Area Telescope (LAT) on the Fermi gamma-ray satellite telescope observes Gamma-Ray Bursts (GRBs) at energies above 100 MeV. Thanks to a new detection algorithm and a new event reconstruction, it is expected to publish a catalogue with more than 100 GRBs. This work aims at revising the prospects for GRB alerts with the Cherenkov Telescope Array (CTA) based on the new LAT results. We start by considering the simulation of the observations with the full CTA of two extremely bright events, the long GRB 130427A and the short GRB 090510; then we investigate how these GRBs would be observed by different subsamples of the array pointing to different directions, adopting the \u201ccoupled divergent\u201d mode

Prospects for Gamma-Ray Burst detection by the Cherenkov Telescope Array

The Large Area Telescope (LAT) on the Fermi satellite is expected to publish a catalogue with more than 100 Gamma-Ray Bursts (GRBs) detected above 100MeV thanks to a new detection algorithm and a new event reconstruction. This work aims at revising the prospects for GRB detection with the Cherenkov Telescope Array (CTA) based on the new LAT results. We start considering the simulation of the observations with the full CTA of 10 bright GRBs detected by Fermi LAT. In the future we plan to investigate how these GRBs would be observed by different subsamples of the array pointing to different directions

Unidades piloto do sistema de produção integrada de feijão comum (Phaseolus vulgaris L.) em plantios irrigados.

O Projeto de Produção Integrada de Feijão Comum pertence ao Sistema Agropecuário de Produção Integrada (SAPI), do Ministério da Agricultura, Pecuária e Abastecimento (MAPA). É coordenado pela Embrapa Arroz e Feijão, em parceria com universidades, empresas públicas e privadas de assistência técnica e extensão rural, indústrias (beneficiamento e processamento), cooperativas e produtores. A implantação das Unidades Piloto tem como objetivo comparar os sistemas de produção integrada e convencional de feijão comum, analisando-se quanto ao impacto ambiental e aos aspectos socioeconômico e financeiro