L'uso della piattaforma Moodle al Politecnico di Torino

La piattaforma Moodle è in uso presso il Politecnico di Torino da almeno 5 anni, con finalità tra di loro molto diverse che spaziano dal Test di Ammissione per tutti i corsi nell'area dell'Ingegneria, ai test di livello per l'inserimento negli insegnamenti della Lingua Inglese, alla verifica della conoscenza della Lingua Italiana per gli studenti stranieri, sino all'utilizzo che sotto descriveremo a titolo di esempio, come parte dell'esame di un insegnamento curricular

Generation of CO2 gas mixtures by dynamic dilution for the development of gaseous certified reference materials

The use of Certified Reference Materials (CRMs) is of utmost importance to achieve the comparability and traceability of data, which are essential features of measurement results in environmental and climate fields. The present paper focuses on the generation of gas mixtures at known composition of carbon dioxide at atmospheric amount-of-substance fraction in synthetic air by means of a dynamic dilution system, designed and implemented at the Istituto Nazionale di Ricerca Metrologica (INRiM). The validation of the dynamic system in terms of amount-of-substance fraction is presented. The system was also used to verify the carbon dioxide amount-ofsubstance fraction of a suite of gas mixtures gravimetrically prepared at INRiM in the framework of the EMPIR Joint Research Project 19ENV05 – STELLAR. Dynamic dilution proved to be an effective tool for the preparation and certification of CRMs for gaseous pollutants (i.e. carbon dioxide, nitrogen oxides) relevant for monitoring environmental pollution and climate changes

Realizzazioni di connessioni per gli impianti di alta tensione installati nei laboratori INRIM

Il presente rapporto tecnico descrive le attività di progettazione/ realizzazione di connessione per impianti di taratura/prova in alta tensione, portate avanti dai tecnici INRIM. La necessità di realizzare connessioni personalizzate è legata alla specificità delle attività svolte all’interno dei laboratori. L’attività di progettazione e realizzazione descritta può essere schematizzata nei seguenti passi:  Individuazione dei circuiti da realizzare;  Definizione dei livelli di tensione di interesse;  Progettazione dei componenti e loro realizzazione;  Realizzazione dei circuiti all’interno dei laboratori.This technical report describes the design/development of custom leads for high voltage calibration/test laboratories, carried out by INRIM technicians. The need of develop custom connection systems are related to the wide range of test/calibration activities. The design and development activities consist of several steps:  Finding out of the circuits to be realized;  Definition of relevant voltage levels;  Design and manufacturing of components;  Set up of circuits inside the laboratories

Realisation and validation of a dilution device for the generation of different isotopic compositions of CO2

Il presente rapporto tecnico descrive l’attività svolta all’INRIM nell’ambito del progetto EMPIR 16ENV06 “Metrology for Stable Isotope Reference Standards - SIRS”, per la realizzazione di un sistema di diluizione dinamica atto a generare materiali di riferimento di CO2 a frazioni molari a livello atmosferico, aventi differente composizione isotopica nell’intervallo (-48/ -8) ‰ VPDB per il δ13C e (-27/ +2) ‰ VPDB per il δ18O. Lo scopo di questa attività è stata la realizzazione di un sistema per generare miscele aventi composizione isotopica e incertezze obiettivo analoghe ai materiali di riferimento “statici” realizzati nel progetto SIRS. Questi materiali di riferimento dinamici verranno utilizzati per validare i materiali di riferimento statici e per studiare la stabilità e il frazionamento delle miscele. La validazione, descritta nel presente rapporto tecnico, è stata incentrata in particolare sullo studio delle prestazioni della camera di miscelamento, che rappresenta il cuore del sistema di diluizione. Il sistema è stato testato in termini di frazione molare, mediante un analizzatore infrarosso non dispersivo. Le miscele di CO2 a frazione molare ambiente, generate all’interno della camera, hanno mostrato una buona ripetibilità con valori di scarto tipo pari a (0.18-0.20 μmol·mol-1). La validazione in termini di composizione isotopica sarà oggetto di un successivo rapporto tecnico.This technical report describes the activity carried out at INRIM within the EMPIR project 16ENV06 “Metrology for Stable Isotope Reference Standards - SIRS”, for the realisation of a dilution device for generating dynamic reference materials of CO2 at ambient mole fractions, with different isotopic compositions to cover the range (-48 to -8) ‰ vs VPDB for δ13C and (-27 to +2) ‰ vs VPDB for δ18O. The aim of the activity was to realise a system to generate mixtures with isotopic composition and target uncertainties as the static reference materials realised in the SIRS project. These dynamic reference materials will be used to validate the static reference materials and to study stability and fractionation of the mixtures. The validation of the dilution system, described in the present technical report, was focused on the performances of the mixing chamber, which represents the core of the system. The system was tested in terms of amount fraction, by using a Non-Dispersive Infrared analyser. The CO2 mixtures at ambient amount fraction, produced inside the chamber, proved to be repeatable with standard deviations of (0.18-0.20 μmol·mol-1). The validation in terms of isotopic composition will be described in a subsequent technical report

Realisation and preliminary validation of a dilution device for the generation of CO2 gas mixtures

The present paper describes the activity carried out at Istituto Nazionale di Ricerca Metrologica (INRIM) within the EMPIR Joint Research Project 16ENV06 “Metrology for Stable Isotope Reference Standards - SIRS”, for the realisation of a dilution device for generating dynamic mixtures of CO2 at ambient mole fractions. The aim of the activity was to realise a system able to generate mixtures with isotopic composition and target uncertainties as the static gravimetric reference materials realised in the SIRS project. These dynamic reference materials can be used to validate the static reference materials and for stability and fractionation studies. The dilution system was realised and a preliminary validation was carried out, focusing on the performances of the mixing chamber, which represents the core of the system. The system was tested in terms of amount fraction, by using a Non-Dispersive Infrared analyser

Metrological features of the Large Piston Prover at INRIM

INRIM realizes its flow rate standard using three distinct facilities, aimed at measuring different flow rate ranges; in particular, for the largest flow range rate (10–2600 L/min) a piston prover is used. This machine is of the volumetric type, therefore its traceability can be obtained through dimensional calibration of the piston, which has a nominal diameter of 1000 mm and a nominal stroke of 1200 mm. The present paper describes in detail the features of the standard, its traceability chain and the uncertainty budget of the measurements it can perform. The uncertainty budget directly determines the Calibration and Measurement Capabilities claim in the range available to the test rig. A detailed analysis of the various uncertainty components will be presented and discussed. Special attention will be dedicated to the dimensional calibration of the piston, since it is of paramount importance for the determination of the main uncertainty component. This calibration is particularly challenging since, due to the large size of the piston, it must be carried on in-situ, thereby requiring a set of special adaptations with respect to a standard calibration of a cylinder. It will be shown that the calibration of the piston recently performed is in good accordance with the one that was carried out at the piston initial installation in 1999, thus confirming the stability of the standard

G-LAS a ring laser goniometer for angular metrology

Accurate measurement of angles down to the nanoradian level is required in precision mechanical industry, as well in geodesy, astronomy and experimental physics. G-LAS (GyroLaser Angular Standard) is the new transportable prototype of goniometer, based on a ring laser gyroscope mounted on a precision turntable, that is presently under test in a collaboration between INRIM and INFN. The target is to achieve an accuracy of the order of 10 nrad, being the accuracy of the most precise existing angular encoders at the level of some 100 nra

The INRIM - INFN Ring Laser Gyroscope for Planar Angle Metrology Application

We present the main characteristics of a new kind of laser goniometer being developed by a collaboration between INRIM and INFN. The target is an absolute accuracy of 10 nrad, being the present accuracy of the most precise angular encoders at the level of some 100 nrad. Our key idea is to setup a square laser cavity of 0.5 m in side, making use of the last generation dielectric super-mirrors employed in the larger gyroscopes for seismology and geophysics