IMEKO Event Proceedings

   

Page 1 of 888 Results 1 - 10 of 8878

M. P. van der Beek, R. van den Brink
'GAS OIL PISTON PROVER', PRIMARY REFERENCE VALUES FOR (HIGH- PRESSURE) GAS-VOLUME, RESULTS

The paper describes the design, measurement results and uncertainty analyses of the hydraulic driven piston-prover system which is in operation at VSL since 2008. The 12 meter long, 0.6 m bore piston-prover is used for the realization of Reference Values for Gas-Volume at pressures between 1 and 65 bar(a) and ‘any’ type of Gas. The principle is based on the displacement of a piston acting as a Gas-Oil separator. The standard has a flow-rate range from 5 to 230 m3/h. The system is designed to calibrate reference meters. The Calibration and Measurement Capability (CMC) of the system is proven smaller than 0.1% (k = 2). The paper also explains the coherence between the Gas-Oil Piston-Prover and other traceability generators and ‘flow rate bootstrapper systems’.

G. Barbato, G. Brondino, M. Galetto, G. Vicario
'ZERO POINT' IN THE EVALUATION OF MARTENS HARDNESS UNCERTAINTY

The Instrumented Indentation Test is based on simultaneous recording of force and indentation depth, obtained during test cycle. The force-depth curve, describing the indentation pattern, is typically formed by two parts having the “zero-point” in common, i.e. the first contact point between the indenter and the surface of test piece. The zero-point determination is a crucial aspect for Martens Hardness evaluation, so that relevant ISO standard suggests to estimate it by extrapolation of polynomial fitted functions. In this paper a new model, based on a segmented function, is proposed. This approach implies the use of maximum likelihood estimator for parameters determination. The corresponding uncertainty is provided through the covariance matrix of the regression model.

T. Rubin, I. Silander, C. Forssén, J. Zakrisson, E. Amer, D. Szabo, T. Bock, A. Kussicke, C. Günz, D. Mari, R. M. Gavioso, M. Pisani, D. Madonna Ripa, Z. Silvestri, P. Gambette, D. Bentouati, G. Garberoglio, M. Lesiuk, M. Przybytek, B. Jeziorski, J. Setina, M. Zelan, O. Axner
‘QUANTUM-BASED REALIZATIONS OF THE PASCAL’: STATUS AND PROGRESS OF THE EMPIR-PROJECT: QUANTUMPASCAL

The QuantumPascal (QP) project combines the capabilities of 12 European institutions to enable traceable pressure measurements utilizing quantum-based methods that evaluate the number density instead of force per area to target the wide pressure range between 1 Pa and 3 MPa. This article summarizes the goals and results since the project start in June 2019.

Dilhermando Augusto de Mello, Luciana A. Almeida Carvalho
"IT IS NOT FORBIDDEN TO DREAM… NOR TO COUNT TALES" METROLOGY EDUCATION FOR THE YOUTH

XVIII IMEKO World Congress presents the paper METROLOGY EDUCATION FOR THE YOUTH. The work addresses among one forms playful to present the metrology fundamentals and the main scientists who contributed with their discoveries, research and measurements, throughout the evolution of the human being and the technology.

M. P. van der Beek, I. J. Landheer
"NMi TraSys", THE ULTIMATE CARRIER & MULTIPLIER FOR THE UNIT OF VOLUME FOR HIGH-PRESSURE NATURAL GAS

The paper describes the newly developed "NMi TraSys" - NMi Traceability System. This travelling carrier & multiplier of traceability has been realized to embody a significant part of the Dutch National traceability-chain for high-pressure gas-flow measurements. The number of contributions of uncertainty as well as their values, due to "copy-losses" and "installation-effects" during the traditional transfer of traceability from one facility to another, are decreased.
First results are presented about observed repeatability and reproducibility, uncertainties and consistency checks. The device will include in time, reference values of three different independently realized primary standards (viz. DDD - Dynamic Displacement Device, GOPP – Gas-Oil Piston-Prover and NMi TraSys itself). With internal harmonization processes at NMi VSL with "input" reference values from the three other primary standards, viz. DDD-conventional, DDD-extended pressure level and GOPP, the aim of 0,1% uncertainty at 4.000 m³ / h and p = 60 bar is within reach. This will improve the uncertainty as well as the stability of the Dutch National reference values considerably.
NMi TraSys will be used as a set of Travelling Reference Meters, creating an efficient availability of stable and validated Harmonized Reference Values for high-pressure gas-flow.

Jerzy Nabielec
“BLIND” CORRECTION OF THE ME ASUREMENT DYNAMIC ERROR – SIMULATION INVESTIGATIONS OF THE SECOND-ORDER SYSTEM

The paper presents a measuring system, which performs auto-correction of dynamic errors caused by its analogue input circuits. Input signal is used for selfidentification of the system parameters. Influence of sampling frequency and A/D converter resolution on the correction efficiency has been investigated. A range of the system analogue part parameters variation, which allows for the efficient correction, has been determined. A measure, which determines the effectiveness of correction as related to the measurement result without the correction has been introduced. Investigation has been carried out for the second-order inertial plants.

Iulian Ilies, Mihai Munteanu, Radu A. Munteanu
“Intelligent” Controller Algorithm for Load Distribution Enhancement of IEEE 802.11 INTER-WLAN Traffic

This paper analyses the possibility to have a dedicated signaling channel for triggering load balancing mechanism based on relevant specific traffic parameters analysis (e.g. throughput, EIRP, Antenna Gain). Compared to classic algorithms, the signaling channel brings the advantage of distributed “effort” between Access Points and Controllers. Experiments were performed with Matlab and the results show the network performance enhancement in terms of Load and Throughput. The proposed signaling channel shows effectiveness of the load distribution enhancing also the network performance.

Komyo Kariya, Shigeru Takayama
“MEASUREMENT SCIENCE” AND EDUCATION TO CULTIVATE SCIENTIFIC BASIC KNOWLEDGE OF PEOPLE

We had already expressed the importance of “Measurement Science” .on the education to rise up the scientific sense for the people live in the society carried on natural science, technique and information. It is the liberty to apply how “Science” to the Education, an answer is in this paper. And we had reported the contents by some papers. This paper suggests the usefulness of application of “Measurement Science” for the stage 1 and stage 2 education (Compulsory Education) and the stage 3 education (Semi-Compulsory Education), when classify National Education in 5 stages.

A. Sabatini, A. Moschitta, P. Carbone
ΣΔ-BASED REMOVAL OF UNWANTED SPECTRAL COMPONENTS FOR SINEWAVE SYNTHESIS

This paper addresses the generation of spectrally pure sinewaves by combining the feedback structure of a ΣΔ loop with digital cancellation of unwanted spectral components in the output signal. In particular, the non-linearities of the in-loop Digital to Analog Converter (DAC) are compensated by applying a digital pre-distortion to the DAC input, and the feedback architecture is used to enhance the performance of the all digital estimation and cancellation algorithm.

Elisa Bonacini, Davide Tanasi
#iziTRAVELSicilia: a participatory storytelling project

The aim of this paper is to present the participatory project "Sicilia Beni Culturali" on the izi.TRAVEL platform, launched in May 2016 and well known on social media as #iziTRAVELSicilia. Recognized as a facilitator of best practice digital promotion and valorization through storytelling and crowdsourcing culture, it has already involved thousands of people. With over 150 audio guides produced on the platform in just over a year, #iziTRAVELSicilia has become a real model of participation in co-creation of cultural values, by practicing the principles set out by the Faro Convention. In this paper we briefly present the project and the example of the Roman Villa of Durrueli and how this platform was and can be furtherused for the dissemination of existing 3D models and for new 3D models, such as those made by the USF - CVAST virtualization project in Sicily.

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