116,701 research outputs found
“Esposizione ambientale ed occupazionale a piombo inorganico: studio degli effetti tossici conseguenti alle dosi correnti e delle relative misure preventive”
No full textin Atti del Convegno Nazionale Esposizione ambientale ed occupazionale a piombo inorganico: studio degli effetti tossici conseguenti alle dosi correnti e delle relative misure preventive, a cura di P. Apostoli, G. Neri, L. Alessio, Brescia, 28-29 giugno 200
Measurement Procedures for the Electrical Characterization of Oxide Thin Films
No full textThis paper describes a measurement system for the electrical characterization of oxide thin films. Such films can be produced using plasma-sputtering processes and permit the realization of a large set of high-performance components, such as capacitors, active devices, sensors, and protective coatings. The electrical properties of the oxide films, which have a thickness of less than 1 μm, are difficult to measure since very high resistances (on the order of gigaohms) and small capacitances (on the order of picofarads) are expected for contact areas smaller than 1 mm2. The measurement system and the procedures described in this paper represent an alternative solution to the commercial devices, which usually employ a mercury probe for performing the contact with the specimen under characterization. Furthermore, the proposed system can be used not only to estimate the electrical properties of a single point but to evaluate the uniformity of oxide films on large specimens as well. The experimental results reported refer to valve-metal-based oxide films deposited in a lab-scale capacitively coupled parallel-plate reactor and show the effectiveness of the proposed procedure
Nicholas Mann, Petrarca, edizione italiana a cura di G.C. Alessio e L.C. Rossi. Premessa di G. Velli
No full textL.E.D., Milan
A Wireless Sensor Network for Cold-Chain Monitoring
No full textThis paper deals with a wireless sensor network that was specifically designed to monitor temperature-sensitive products during their distribution with the aim of conforming to the cold-chain assurance requirements. The measurement problems and the constraints that have been encountered in this application are initially highlighted, and then, an architecture that takes such problems into account is proposed. The proposed architecture is based on specifically designed measuring nodes that are inserted into the products to identify their behavior under real operating conditions, e.g., during a typical distribution. Such product nodes communicate through a wireless channel with a base station, which collects and processes the data sent by all the nodes. A peculiarity of the product nodes is the low cost, which allows the information on the cold-chain integrity to be provided to the final customer. The results that refer to the functional tests of the proposed system and to the experimental tests performed on a refrigerated vehicle during a distribution are reporte
Recensione di Immanuel Kant, Elementi metafisici della Dottrina della virtù, a cura di Francesca Fantasia e Carmelo Alessio Meli, Milano, Mimesis, 2023
No full textRecensione di una recente traduzione degli Elementi metafisici della Dottrina della virtù di I. Kant, a cura di Francesca Fantasia e Carmelo
Alessio Meli
Handheld-Impedance-Measurement System with seven-decade capability and potentiostatic function
No full textThis paper describes design and test of a new impedance-measurement system for nonlinear devices that exhibits a seven-decade range and works down to a frequency of 0.01 Hz. The system is specifically designed for electrochemical measurements, but the proposed architecture can be employed in many other fields where flexible signal generation and analysis are required. The system employs an unconventional signal generator based on two pulsewidth modulation (PWM) oscillators and an autocalibration system that allows uncertainties of less than 3% to be obtained over a range of 1 kΩ to 100 GΩ. A synchronous demodulation processing allows the noise superimposed to the low-amplitude input signals to be made negligibl
Ultrasonic distance sensor improvement using a two-level neural network
No full textThis paper discusses the performance improvement that a neural network can provide to a contactless distance sensor based on the measurement of the time of flight (TOF) of an ultrasonic (US) pulse. The sensor, which embeds a correction system for the temperature effect, achieves a distance uncertainty (rms) of less than 0.5 mm over 0.5 m by using a two-level neural network to process the US echo and determine the TOF in the presence of environmental acoustic noise. The network embeds a "guard" neuron that guards against gross measurement errors, which would be possible in the presence of high environmental noise
Nicholas Mann, Petrarca, edizione italiana a cura di G.C. Alessio e L.C. Rossi. Premessa di G. Velli, L.E.D., Milano 1993
No full text- …
