1. Performance of the Cherenkov Telescope Array in the presence of cloudsMario Pecimotika, Saptashwa Bhattacharyya, Barbara MARČUN, Judit Pérez Romero, Samo Stanič, Veronika Vodeb, Serguei Vorobiov, Gabrijela Zaharijas, Marko Zavrtanik, Danilo Zavrtanik, Miha Živec, 2021, published scientific conference contribution Abstract: The Cherenkov Telescope Array (CTA) is the future ground-based observatory for gamma-ray astronomy at very high energies. The atmosphere is an integral part of every Cherenkov telescope. Di˙erent atmospheric conditions, such as clouds, can reduce the fraction of Cherenkov photons produced in air showers that reach ground-based telescopes, which may a˙ect the performance. Decreased sensitivity of the telescopes may lead to misconstructed energies and spectra. This study presents the impact of various atmospheric conditions on CTA performance. The atmospheric transmission in a cloudy atmosphere in the wavelength range from 203 nm to 1000 nm was simulated for di˙erent cloud bases and di˙erent optical depths using the MODerate resolution atmospheric TRANsmission (MODTRAN) code. MODTRAN output files were used as inputs for generic Monte Carlo simulations. The analysis was performed using the MAGIC Analysis and Reconstruction Software (MARS) adapted for CTA. As expected, the e˙ects of clouds are most evident at low energies, near the energy threshold. Even in the presence of dense clouds, high-energy gamma rays may still trigger the telescopes if the first interaction occurs lower in the atmosphere, below the cloud base. A method to analyze very high-energy data obtained in the presence of clouds is presented. The systematic uncertainties of the method are evaluated. These studies help to gain more precise knowledge about the CTA response to cloudy conditions and give insights on how to proceed with data obtained in such conditions. This may prove crucial for alert-based observations and time-critical studies of transient phenomena.
Keywords: Cherenkov Telescope Array, very-high energy gamma rays, MODerate resolution atmospheric TRANsmission code, MAGIC Analysis and Reconstruction Software
Published in RUNG: 18.09.2023; Views: 601; Downloads: 4
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2. Protein quality control for improved data reproducibility and reliabilityKim Remans, Ario De Marco, Nick Berrow, Mario Lebendiker, Maria Garcia-Alai, Stefan Knauer, Andre Matagne, Anne Perret, Stephan Uebel, Bertrand Raynal, 2022, published scientific conference contribution abstract Keywords: protein quality, evaluation assays, biophysical methods
Published in RUNG: 13.04.2023; Views: 809; Downloads: 0
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3. Biopolymers produced by treating waste brewer’s yeast with active sludge bacteria : the qualitative analysis and evaluation of the potential for 3D printingGregor Drago Zupančič, Anamarija Lončar, Sandra Budžaki, Mario Panjicko, 2022, original scientific article Keywords: brewers’ yeast, active sludge bacteria, anaerobic digestion, biogas potential, biopolymer, 3D printing
Published in RUNG: 01.08.2022; Views: 1550; Downloads: 23
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4. A dual-wavelength photothermal aerosol absorption monitor : design, calibration and performanceLuka Drinovec, Uroš Jagodič, Luka Pirker, Miha Škarabot, Mario Kurtjak, Kristijan Vidović, Luca Ferrero, Bradley Visser, Jannis Röhrbein, Ernest Weingartner, Daniel M. Kalbermatter, Konstantina Vasilatou, Griša Močnik, 2022, original scientific article Abstract: There exists a lack of aerosol absorption measurement techniques with low uncertainties and without artefacts. We have developed the two-wavelength Photothermal Aerosol Absorption Monitor (PTAAM-2λ), which measures the aerosol absorption coefficient at 532 and 1064 nm. Here we describe its design, calibration and mode of operation and evaluate its applicability, limits and uncertainties. The 532 nm channel was calibrated with ∼ 1 µmol mol−1 NO2, whereas the 1064 nm channel was calibrated using measured size distribution spectra of nigrosin particles and a Mie calculation. Since the aerosolized nigrosin used for calibration was dry, we determined the imaginary part of the refractive index of nigrosin from the absorbance measurements on solid thin film samples. The obtained refractive index differed considerably from the one determined using aqueous nigrosin solution. PTAAM-2λ has no scattering artefact and features very low uncertainties: 4 % and 6 % for the absorption coefficient at 532 and 1064 nm, respectively, and 9 % for the absorption Ångström exponent. The artefact-free nature of the measurement method allowed us to investigate the artefacts of filter photometers. Both the Aethalometer AE33 and CLAP suffer from cross-sensitivity to scattering – this scattering artefact is most pronounced for particles smaller than 70 nm. We observed a strong dependence of the filter multiple scattering parameter on the particle size in the 100–500 nm range. The results from the winter ambient campaign in Ljubljana showed similar multiple scattering parameter values for ambient aerosols and laboratory experiments. The spectral dependence of this parameter resulted in AE33 reporting the absorption Ångström exponent for different soot samples with values biased 0.23–0.35 higher than the PTAAM-2λ measurement. Photothermal interferometry is a promising method for reference aerosol absorption measurements.
Keywords: aerosol absorption, calibration, black carbon
Published in RUNG: 28.06.2022; Views: 1181; Downloads: 25
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5. Protein purification strategies must consider downstream applications and individual biological characteristicsKim Remans, Mario Lebendiker, Celeste Abreu, Mariano Maffei, Shaila Sellathurai, Marina May, Ondrej Vanek, Ario De Marco, 2022, review article Keywords: protein purification, quality control, protein functionality
Published in RUNG: 08.04.2022; Views: 1448; Downloads: 193
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6. Experimental dataset - A dual-wavelength photothermal aerosol absorption monitor: design, calibration and performanceLuka Drinovec, Uroš Jagodič, Luka Pirker, Miha Škarabot, Mario Kurtjak, Kristijan Vidović, Luca Ferrero, Bradley Visser, Jannis Röhrbein, Ernest Weingartner, Daniel Kalbermatter, Konstantina Vasilatou, Tobias Bühlmann, Celine Pascale, Thomas Müller, Alfred Wiedensohler, Griša Močnik, complete scientific database of research data Keywords: photothermal interferometer, aerosol light absorption coefficient
Published in RUNG: 14.01.2022; Views: 1782; Downloads: 28
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7. All’interfaccia tra prosodia e struttura informativa : la realizzazione prosodica dell’informazione data in tedesco e in italiano L2Cinzia Avesani, Giuliano Bocci, Mario Vayra, Alessandra Zappoli, 2013, published scientific conference contribution Abstract: Germanic and Romance languages differ in the way they assign prosodic prominence within the domain of the utterance in the discourse structure. Italian relies on the hierarchical phonological structure and assigns the prosodic prominence to the metrical head on the right. On the other hand, German assigns prominence combining both the phonological structure and the pragmatic information, considering the degree of activation of a specific referent. Referents that have not been previously mentioned introduce New information in the discourse. New information is marked with prominent pitch patterns. On the contrary, referents that have been already mentioned are cognitively activated in the mind of the hearer and they represent Given information. Given information has been proven to be most frequently deaccented in Germanic languages. In this study, we show that native speakers of Italian, Second Language learners of German, show to have difficulties in the acquisition of the Deaccentuation pattern, and are affected by prosodic transfer from their L1. The L1 prosodic system not being sensitive to the pragmatic cues can assign prominence on a metrical head even if the referent is Given within Discourse. On the contrary, we show that native speakers of German, learning Italian as a second language show to acquire more easily the prosodic pattern of Italian.
Keywords: Pitch Accents, Prosody, L2 acquisition, Transfer, Given Information, Deaccenting, German, Italian
Published in RUNG: 12.01.2022; Views: 1600; Downloads: 0
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8. Prosody and information status in Italian and German L2 intonationCinzia Avesani, Giuliano Bocci, Mario Vayra, 2015, independent scientific component part or a chapter in a monograph Abstract: In this work, we address the systemic difference in the prosodic strategies of accentuation at the utterance level of Italian and German, belonging respectively to Romance and Germanic languages. In particular, we address the Interlanguage properties of the speech produced by adult Second Language Learners of the two languages analyzing their production in semi-spontaneous elicitation contexts.
We focus on the acquisition of the interplay of phonological and discourse structure occurring in German causing Given Information to be prosodically deaccented, because already cognitively activated in the mind of the interlocutor. The Deaccentuation contour is prosodically realized as a flat low pitch contour and is pragmatically assigned in Germanic languages to a non-focused element, even in positions that metrically would require the positioning of a Nuclear Pitch Accent. This strategy is not reported in Italian, causing referents that align to the position of the prosodic metrical head to be standardly pitch-accented. Deaccentuation, is hard to acquire and subject to prosodic transfer when produced by L2 learners native speakers of Italian, especially when aligning with the metrical head requiring accentuation. Italian L2 speakers of German show to accent Given referents because adopting the Italian accentuation strategy, while German L2 speakers of Italian seem to accommodate more easily the accentuation pattern in L2. We provide a possible explanation in light of the Differential Markedness Hypothesis that considers the number of parameters to be acquired by the L2 speakers.
Keywords: pitch accents, deaccentuation, German, Italian, discourse structure, L2 acquisition, prosody
Published in RUNG: 14.12.2021; Views: 1615; Downloads: 0
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9. The mapping between prosody and information structure in German and in Italian L2 learners : who tranfers what?Cinzia Avesani, Giuliano Bocci, Mario Vayra, Alessandra Zappoli, 2013, published scientific conference contribution abstract Keywords: prosody, information status, german, italian, L2 acquisition, Deaccentuation
Published in RUNG: 14.12.2021; Views: 1506; Downloads: 37
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