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2493. Vers une connaissance microscopique de la structure de verres de phosphate P2O5Nicolas Richard, Luigi Giacomazzi, Nikita S. Shcheblanov, Layla Martin-Samos, Nadege Ollier, 2020, poljudni članek Opis: Les propriétés d’amplification de la lumière des ions terres rares permettent en les incluant comme dopants dans le cœur des fibres optiques d’obtenir des sources laser et des amplificateurs de lumière compacts. Pour réduire la tendance à l’agrégation des terres rares qui diminuent leurs propriétés amplificatrices, le phosphore est employé comme co-dopant dans ces fibres. Cet article montre comment les méthodes de simulation à l’échelle atomique
peuvent aider a' l'optimisation de ce co-dopage en contribuant a' une meilleure comprehension de la structure des verres phosphates
[1] et des défauts qui leur sont liés [2]. Au CEA-DAM, ces resultats serviront aussi dans le cadre d'etudes sur le developpement de fibres optiques pour des mesures de dosimetrie radiative.
Ključne besede: glasses, P2O5, point defects, ab-initio
Objavljeno v RUNG: 18.09.2020; Ogledov: 2920; Prenosov: 0
Gradivo ima več datotek! Več... |
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2499. Characterization of the Magnetic Anisotropy of Hard Magnetic Nanoparticles by Singular Point Detection TechniqueC. De Julian Fernandez, D. Mishra, R. Cabassi, F. Bolzoni, M. Petrecca, M. Albino, M Saura-Muzquiz, Petra Jenuš, A. Quesada, M Christensen, T Schliesch, B Belec, C Sangregorio, F Albertini, 2020, objavljeni povzetek znanstvenega prispevka na konferenci Ključne besede: nanomagnetism
Objavljeno v RUNG: 15.09.2020; Ogledov: 2614; Prenosov: 0
Gradivo ima več datotek! Več... |
2500. Performance of microAethalometers: Real-world Field Intercomparisons from Multiple Mobile Measurement Campaigns in Different Atmospheric EnvironmentsHoney Alas, Thomas Mueller, Kay Weinhold, Sascha Pfeifer, Kristina Glojek, Asta Gregorič, Griša Močnik, Luka Drinovec, Francesca Costabile, Martina Ristorini, A. Wiedensohler, 2020, izvirni znanstveni članek Opis: Small aethalometers are frequently used to measure equivalent black carbon (eBC) mass concentrations in the context of personal exposure and air pollution mapping through mobile measurements (MM). The most widely used is the microAethalometer (AE51). Its performance in the laboratory and field is well documented, however, there is not sufficient data in the context of its performance in different environments. In this investigation, we present the characterization of the performance of the AE51 through field unit-to-unit intercomparisons (IC), and against a reference absorption photometer from three MM campaigns conducted in drastically different environments. Five IC parameters were considered: i) study area, ii) location of IC, iii) time of day, iv) duration of IC, and v) correction for the filter-loading effect. We can conclude that it is crucial where and how long the IC have been performed in terms of the correlation between the mobile and reference instruments. Better correlations (R2 > 0.8, slope = 0.8) are achieved for IC performed in rural, and background areas for more than 10 minutes. In locations with more homogenous atmosphere, the correction of the loading effect improved the correlation between the mobile and reference instruments. In addition, a newer microAethalometer model (MA200) was characterized in the field under extreme cold conditions and correlated against another MA200 (R2 > 0.8, slope ≈ 1.0), AE51(R2 > 0.9, slope ≈ 0.9), and a stationary Aethalometer (AE33) across all wavelengths (R2 > 0.8, slope ≈ 0.7). For MA200, the loading effect was more pronounced, especially at the lower wavelengths, hence the correction of the loading effect is essential to improve the correlation against the AE33. The MA200 and AE51 proved to be robust and dependable portable instruments for MM applications. Real-world quality assurance of these instruments should be performed through field IC against reference instruments with longer durations in areas of slowly changing eBC concentration.
Ključne besede: Portable instruments, Mobile monitoring, Black carbon, Instrument intercomparisons
Objavljeno v RUNG: 15.09.2020; Ogledov: 2684; Prenosov: 184
 Celotno besedilo (3,54 MB) |
