1,720,960 research outputs found
Raman spectroscopy for inline analysis of combustion processes
No full textA novel approach for cost-effective and time resolved combustion gas diagnostics based on spontaneous Stokes Raman spectroscopy is presented in this document.
The proposed instrument uses a multi-pass configuration designed to increase the scattering generation, giving information about gas species concentrations, including H2 and N2 that are not commonly available from analysis with absorption spectroscopy techniques. The system performs calibrated analysis providing both qualitative and quantitative information about the gas composition. Depending on the application, the device can work with spectra integration time from 0.15 s up to 10 s, with a Raman spectrum ranging from the H2 rotational peak at Raman shift of 587 cm−1 up to the H2 vibrational peak at cm−1, covering all the Raman emissions of major combustion species. The device response was characterized with a working pressure from 0.7 bar to 7.5 bar; The instrument prototype has been made completely transportable and ready to be operated in relevant industrial environments (TRL6).
The work presented in this thesis was carried out at the Institute of Photonics and Nanotechnologies of the Italian National Research Council (CNR-IFN), Padua branch, in collaboration with the PhD Course in Space Sciences, Technologies, and Measurements of the Center of Studies and Activities for Space - CISAS G.Colombo, University of Padua
Raman Spectroscopy for Temporally Resolved Combustion Gas Diagnostics
No full text: A novel approach for cost-effective and temporally resolved in-line combustion gas diagnostics based on spontaneous Stokes Raman spectroscopy is presented in this paper. The proposed instrument uses a multipass configuration designed to increase the scattering generation, giving information about gas species concentrations, including H2 and N2 that are not commonly available from analysis with absorption spectroscopy techniques. The system performs calibrated analysis providing both qualitative and quantitative information about the gas composition. Depending on the application, the device can work with spectra integration time from 0.15 s up to 10 s, with a Raman spectrum ranging from the H2 rotational peak at Raman shift of 587 cm-1 up to the H2 vibrational peak at 4156 cm-1, covering all the Raman emissions of major combustion species. The device response was characterized by a working pressure from 0.7 to 7.5 bar. The instrument prototype has been made completely transportable, designed to operate using a gas sampling system, and ready to be operated in relevant industrial in-line environments
Multipass Raman spectroscopy applied to qualitative and quantitative combustion gas diagnostic
No full textThis paper introduces a novel laser-based system designed for real-time Raman spectroscopy applied to in-line combustion diagnostics. While Raman spectroscopy is a well-established technique for solid and liquid analysis, its application to gas samples is challenging due to their low density, which limits the intensity of Raman scattering. To address this issue, our system utilizes a multipass cell, strategically designed to enhance signal generation and its collection. The instrument performs calibrated analysis, providing qualitative and quantitative information about gas composition. Depending by the application, the system can work with spectra integration time ranging from 0.15 s up to 10 s. This study has demonstrated that Raman spectroscopy can be a useful tool for combustion diagnostics, as it can operate fast enough to follow the time scale of combustion phenomena
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Evaluating the flux of cosmic protons along the orbit of a Compton gamma-ray space telescope
Full text linkThe purpose of this work is to derive the required data for the design of a nano satellite for MeV gamma-ray astrophysics by the University of Padova.
The main concern is to describe the flux of trapped and primary protons along a near equatorial orbit. This is of interest since protons can activate spacecraft’s materials and therefore cause a significant instrumental background.
Lo scopo di questa tesi è quello di ricavare informazioni per il design di un nano satellite per astrofisica a raggi gamma per l'Università degli studi di Padova.
L'argomento principale è la caratterizzazione dei flussi di protoni primari ed intrappolati lungo un'orbita quasi equatoriale. Questo aspetto risulta di interesse in quanto i protoni possono attivare i materiali del satellite provocando degli effetti di background non trascurabili.ope
Satellite localization for gamma-ray pulsar observations in Low Earth Orbit
Full text linkThe purpose of this thesis work is the design, development and performance evalu-ation of a satellite's localization filter based on the GPS technology. One possibleapplication is a proposed CubeSat demonstrator for MeV gamma-ray astrophysicsbeing investigated at the University of Padova. For the development and test theFermiGamma-Ray Space Telescope mission istaken as reference application
Satellite localization for gamma-ray pulsar observations in Low Earth Orbit
Full text linkThe purpose of this thesis work is the design, development and performance evalu-ation of a satellite's localization filter based on the GPS technology. One possibleapplication is a proposed CubeSat demonstrator for MeV gamma-ray astrophysicsbeing investigated at the University of Padova. For the development and test theFermiGamma-Ray Space Telescope mission istaken as reference application.ope
Evaluating the flux of cosmic protons along the orbit of a Compton gamma-ray space telescope
Full text linkThe purpose of this work is to derive the required data for the design of a nano satellite for MeV gamma-ray astrophysics by the University of Padova.
The main concern is to describe the flux of trapped and primary protons along a near equatorial orbit. This is of interest since protons can activate spacecraft’s materials and therefore cause a significant instrumental background.
Lo scopo di questa tesi è quello di ricavare informazioni per il design di un nano satellite per astrofisica a raggi gamma per l'Università degli studi di Padova.
L'argomento principale è la caratterizzazione dei flussi di protoni primari ed intrappolati lungo un'orbita quasi equatoriale. Questo aspetto risulta di interesse in quanto i protoni possono attivare i materiali del satellite provocando degli effetti di background non trascurabili
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