1,721,045 research outputs found
Gruppo Misure Elettriche ed Elettroniche : atti del XXIX Congresso Nazionale. Monopoli, 2-5 settembre 2012
No full textSiamo giunti al XXIX Congresso Nazionale del GMEE. Il gruppo di ricercatori di Misure Elettriche ed Elettroniche, prima come gruppo informale del CNR e, da quasi dieci anni, come associazione, coglie questa occasione per fare annualmente il punto sullo stato della ricerca nel proprio settore, ma non solo. Quest'anno il convegno ritorna per la terza volta in Puglia, a conferma della consolidata tradizione dei ricercatori di questa regione nello scenario misuristico nazionale. Dopo l'eccellente esperienza di Genova, anche quest'anno il convegno è in parte co-gestito con gli amici e colleghi del Gruppo di Misure Meccaniche e Termiche, gruppo con cui siamo oramai fusi a livello di settore concorsuale, e con cui cercheremo di creare un connubio ancora più stretto nei prossimi anni
High accuracy testbed for thermoelectric module characterization
No full textIn this paper, we present an improved version of the unified method (UM) for thermo-electric modules (TEM) characterization with the aim to reduce the overall parameters uncertainty. The parameters that make up the commonly accepted figure of merit Z or zT are mainly affected by temperature related uncertainty, which also significantly limit the precision of the test conditions and thus the reliability of derived models. To overcome these limitations, we conceived a novel and simplified measurement setup that relies at the same time on thermistor technology rather than thermocouple and on a lower number of required components. The improved setup, exploits a solid calibration procedure to reduce the uncertainty in temperature measurements from 1.4 ◦C typical of a J-type thermocouple (Class 1 IEC-EN 60584-2) to 0.027 ◦C with calibrated thermistors, leading to a previously unachievable millidegree-precision temperature control and to an uncertainty drop of two orders of magnitude in all the temperature-derived measurements. Such improvement has a direct feedback on both the αS and Θ, leading to a drop of a least one order of magnitude for a ΔT of 3 ◦C and more than 44 times for the latter at 30 ◦C. As result, the figure of merit zTcan now be determined with an uncertainty equal to 0.58%
Wireless Sensor Networks for Environmental Monitoring
Full text linkIn this editorial, an overview of the content of the Special Issue on “Wireless Sensor Networks for Environmental Monitoring” is provided [...
STIMA PARAMETRICA E CARATTERIZZAZIONE METROLOGICA DEL MODELLO A DUE DIODI PER PANNELLI FOTOVOLTAICI
No full textA Technique to Improve the Image Quality in Computer Tomography
No full textThe purpose of this paper is to assess the effect of different noise reduction filters on computed tomography (CT) images. In particular, denoising filters based on the combination of Gaussian and Prewitt operators and on anisotropic diffusion are proposed. Simulation results show that the proposed techniques increase the image quality and allow the use of a low-dose CT protocol
Laboratories practices in engineering educational courses: the problem of thermocouple cold junction compensation with calibration error correction
No full textIn this paper the preliminary work of laboratory practices developed for didactic purposes for undergraduate courses at the Engineering Faculty of Polytechnic of Bari is presented.
The educational purposes of these experiments can be summarized as follow:
- to grant students the opportunity to verify theoretical arguments introduced in theoretical lessons;
- to give technical skills;
- to integrate research work and educational programs promoting the insertion of student in the scientific community.
In this paper a technical solution useful to measure temperature by means of thermocouples is described; the main goal of the proposed technique is that it employs only one programmable multimeter and some devices commonly available in university laboratories
Optimization Techniques in the Magnetic Resonance Imaging
No full textThe main purpose of this work is to analyze the Magnetic Resonance Imaging (MRI) methodologies used in non-invasive clinical investigation, with the aim of developing suitable denoising filtering techniques to improve the image quality and to allow the reduction of the acquisition time during an health examination. In this way the number of tests that can be performed in the same amount of time can be increased.
This work was carried out in collaboration with the staff of Martina Franca Hospital (Italy), which provided ourselves the material necessary for the development of the simulation algorithm and the sample images on which the algorithm has been tested
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