Search results for "Instrument"

Study of the response of phenol compounds exposed to thermal neutrons beams for Electron Paramagnetic Resonance dosimetry

2015

Abstract This paper reports the results regarding a new organic compound (IRGANOX ® 1076 phenols) with and without low content (5% by weight) of gadolinium oxide (Gd 2 O 3 ) for Electron Paramagnetic Resonance (EPR) dosimetry of neutron beams. The dependence of EPR signal as function of neutron dose was investigated in the fluence range studied between 10 11  cm −2 to 10 14  cm −2 . We evaluated also the effect of gadolinium on 60 Co gamma photon sensitivity of this organic compound. Our analysis showed that a low concentration of gadolinium oxide (of the order of 5% of the total mass of the dosimeter) can enhance the thermal neutron sensitivity more than 10 times with a small reduction of …

The measurement of impurities in silicon for solar cell production

2012

The power conversion efficiency of solar cells is largely dependent on impurity levels in silicon. In the current investigations two sample preparation methods of silicon had been used before analysis - acid dissolution at atmospheric pressure and pressured microwave assisted technique. Quantification of impurities in solar silicon was done by inductively coupled plasma mass spectrometry and electrothermal atomic spectrometry. Microwave assisted dissolution of solar silicon was more effective compared to the traditional dissolution method on the hot plate, but complete dissolution of impurities and silicon matrix was achieved with a nitric and hydrofluoric acid mixture. The mass of solar si…

Twenty Years of Airborne Water Vapor and Total Water Measurements of a Diode Laser Based Photoacoustic Instruments

2020

We present relevant issues collected over twenty years of development and operation of an airborne water vapour / total water detector based on photoacoustic spectroscopy. The WaSulHygro instrument possesses high selectivity, short response time, and wide dynamic range, that are key requirements against trace gas measurement systems for applications in atmospheric sciences. Besides the major properties of WaSul-Hygro we discuss our efforts to develop a robust instruments that have proved its long-term reliability over the last fifteen years operating on-board a commercial aircraft within the framework of the CARIBIC project.2

Les instruments fiscaux de la RSE

2013

National audience

Sull’applicabilità in materia tributaria della penalità di mora prevista dal codice di procedura civile

2021

Nel giudizio tributario di annullamento, se a volte la rimozione dell’atto dichiarato illegittimo risulta già pienamente satisfattiva, altre volte potrebbe non essere sufficiente, rendendosi necessaria un’attività in positivo dell’amministrazione, consistente, ad esempio, nella cancellazione dell’iscrizione a ruolo, o di un provvedimento cautelare già adottato. In ambito processual-civilistico l’art. 614 bis c.p.c. prevede uno strumento di coazione indiretta, finalizzato a stimolare l’esecuzione spontanea delle sentenze di condanna all’adempimento di obbligazioni diverse dal pagamento delle somme di denaro. All’interno del decreto sul processo tributario non si rinviene alcuna norma che dis…

Metrological performances of voltage and current instrument transformers in harmonics measurements

2018

In the new electrical system scenario, the increasing presence of non-linear loads and renewable energy sources makes the measurement of harmonics an essential task. The accuracy of harmonic measurement firstly depends on the used instrument transformers for voltage and current sensing. Since the behavior of instrument transformers in non-sinusoidal conditions is not always well defined, this paper presents an experimental study on the metrological performances of current and voltage instrument transformers (CTs and VTs) in the presence of harmonics. Proper tests procedures are defined and measurement setups are developed for both CTs and VTs calibration. The analysis is carried out by usin…

Current transformers effects on the measurement of harmonic active power in LV and MV networks

2011

The harmonic active power is used to determine the location of polluting loads, the direction of harmonic power flow and to estimate how consequential a certain current harmonic source is. The highest uncertainties, when measuring harmonic active power, are introduced by the current and voltage transducers. This paper presents experimental results which show the impact of current transformers (CTs) on the accuracy of the harmonic power measurements. An expression for the evaluation of the power error in distorted conditions was developed which can be easily utilized in the case of linear current transducers. It is shown how CTs cannot be considered linear transducers and how the higher the …

Nederland en het einde van de Belle Epoque. Internationaal recht als instrument van vredeshandhaving

2006

Self-Efficacy Between Previous and Current Mathematics Performance of Undergraduate Students: An Instrumental Variable Approach to Exposing a Causal …

2021

PurposeSelf-efficacy has been argued theoretically and shown empirically to be an essential construct for students’ improved learning outcomes. However, there is a dearth of studies on its causal effects on performance in mathematics among university students. Meanwhile, it will be erroneous to assume that results from other fields of studies generalize to mathematics learning due to the task-specificity of the construct. As such, attempts are made in the present study to provide evidence for a causal relationship between self-efficacy and performance with a focus on engineering students following a mathematics course at a Norwegian university.MethodThe adopted research design in the presen…

Musculoskeletal pain in professional orchestra instrumentalists and its determinants: a Polish pilot study

2022

Introduction: This study aimed to assess pain in professional musicians playing various instruments, as well as to analyse the relationships between the intensity and frequency of pain and the duration of playing the instrument and somatic variables. Materials and methods: A cross-sectional study was conducted between 60 professional musicians, who were divided into 3 groups: cellists, violinists, and musicians playing wind instruments. Pain intensity was assessed using the visual analogue scale (VAS). The respondents also assessed the frequency of musculoskeletal disorders, the location of pain, the number of hours of playing the instrument per week, and the playing experience in years. In…