41. Spectroscopic analysis of the strongly lensed SN Encore : constraints on cosmic evolution of Type Ia supernovaeS. Dhawan, Justin Pierel, M. Gu, A. B. Newman, C. Larison, M. Siebert, Tanja Petrushevska, F. Poidevin, S. W. Jha, W. Chen, 2024, original scientific article Abstract: Abstract
Strong gravitational lensing magnifies the light from a background source, allowing us to study these sources in detail. Here, we study the spectra of a z = 1.95 lensed Type Ia supernova SN Encore for its brightest Image A, taken 39 days apart. We infer the spectral age with template matching using the supernova identification (SNID) software and find the spectra to be at 29.0 ±5.0 and 37.4 ±2.8 rest-frame days post maximum respectively, consistent with separation in the observer frame after accounting for time-dilation. Since SNe Ia measure dark energy properties by providing relative distances between low- and high-z SNe, it is important to test for evolution of spectroscopic properties. Comparing the spectra to composite low-z SN Ia spectra, we find strong evidence for similarity between the local sample and SN Encore. The line velocities of common SN Ia spectral lines, Si II 6355 and Ca II NIR triplet are consistent with the distribution for the low-z sample as well as other lensed SNe Ia, e.g. iPTF16geu (z = 0.409)and SN H0pe (z = 1.78). The consistency between the low-z sample and lensed SNe at high-z suggests no obvious cosmic evolution demonstrating their using as high-z distance indicators, though this needs to be confirmed/refuted via a larger sample. We also find that the spectra of SN Encore match the predictions for explosion models very well. With future large samples of lensed SNe Ia e.g. with the Vera C. Rubin Observatory, spectra at such late phases will be important to distinguish between different explosion scenarios.
Keywords: Encore
Published in RUNG: 29.10.2024; Views: 248; Downloads: 1
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42. Characterization of sustainable biocompatible materials based on chitosan : cellulose composites containing sporopollenin exine capsulesDorota Korte, Mohanachandran Nair Sindhu Swapna, Hanna Budasheva, Patricia Cazón, Manisha Chhikara, Tina Škorjanc, Carmen Tripon, Alexandra Farcas, Egon Pavlica, Chieu D. Tran, Mladen Franko, 2024, original scientific article Keywords: material characterization, biocompatible materials, chitosan, sporopollenin exine capsules, beam deflection spectrometry
Published in RUNG: 29.10.2024; Views: 218; Downloads: 0
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44. Atmospheric black carbon in the metropolitan area of La Paz and El Alto, Bolivia: concentration levels and emission sourcesValeria Mardoñez-Balderrama, Griša Močnik, Marco Pandolfi, Robin L. Modini, Fernando Velarde, Laura Renzi, Angela Marinoni, Jean-Luc Jaffrezo, Isabel Moreno R., Diego Aliaga, 2024, original scientific article Abstract: Abstract. Black carbon (BC) is a major component of submicron particulate matter (PM), with significant health and climate impacts. Many cities in emerging countries lack comprehensive knowledge about BC emissions and exposure levels. This study investigates BC concentration levels, identifies its emission sources, and characterizes the optical properties of BC at urban background sites of the two largest high-altitude Bolivian cities: La Paz (LP) (3600 m above sea level) and El Alto (EA) (4050 m a.s.l.), where atmospheric oxygen levels and intense radiation may affect BC production. The study relies on concurrent measurements of equivalent black carbon (eBC), elemental carbon (EC), and refractory black carbon (rBC) and their comparison with analogous data collected at the nearby Chacaltaya Global Atmosphere Watch Station (5240 m a.s.l). The performance of two independent source apportionment techniques was compared: a bilinear model and a least-squares multilinear regression (MLR). Maximum eBC concentrations were observed during the local dry season (LP: eBC = 1.5 ± 1.6 µg m−3; EA: 1.9±2.0 µg m−3). While eBC concentrations are lower at the mountain station, daily transport from urban areas is evident. Average mass absorption cross sections of 6.6–8.2 m2 g−1 were found in the urban area at 637 nm. Both source apportionment methods exhibited a reasonable level of agreement in the contribution of biomass burning (BB) to absorption. The MLR method allowed the estimation of the contribution and the source-specific optical properties for multiple sources, including open waste burning.
Keywords: black carbon, aerosol absorption, source apportionment, mass absorption cross-section
Published in RUNG: 29.10.2024; Views: 229; Downloads: 0
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45. Photothermal infrared radiometry and thermoreflectance - unique strategy for thermal transport characterization of nanolayersAnkur Chatterjee, Mohanachandran Nair Sindhu Swapna, Ameneh Mikaeeli, Misha Khalid, Dorota Korte, Andreas D. Wieck, Michal Pawlak, 2024, original scientific article Keywords: thermoreflectance, thermal anisotropy, photothermal radiometry, frequency domain thermoreflectance (FDTR)
Published in RUNG: 28.10.2024; Views: 229; Downloads: 0
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46. Prospects for a survey of the galactic plane with the Cherenkov Telescope ArrayK. Abe, Saptashwa Bhattacharyya, Judit Pérez Romero, Samo Stanič, Veronika Vodeb, Serguei Vorobiov, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, Miha Živec, 2024, original scientific article Abstract: Approximately one hundred sources of very-high-energy (VHE) gamma rays are known in the Milky Way, detected with a combination of targeted observations and surveys. A survey of the entire Galactic Plane in the energy range from a few tens of GeV to a few hundred TeV has been proposed as a Key Science Project for the upcoming Cherenkov Telescope Array Observatory (CTAO). This article presents the status of the studies towards the Galactic Plane Survey (GPS). We build and make publicly available a sky model that combines data from recent observations of known gamma-ray emitters with state-of-the-art physically-driven models of synthetic populations of the three main classes of established Galactic VHE sources (pulsar wind nebulae, young and interacting supernova remnants, and compact binary systems), as well as of interstellar emission from cosmic-ray interactions in the Milky Way. We also perform an optimisation of the observation strategy (pointing pattern and scheduling) based on recent estimations of the instrument performance. We use the improved sky model and observation strategy to simulate GPS data corresponding to a total observation time of 1620 hours spread over ten years. Data are then analysed using the methods and software tools under development for real data. Under our model assumptions and for the realisation considered, we show that the GPS has the potential to increase the number of known Galactic VHE emitters by almost a factor of five. This corresponds to the detection of more than two hundred pulsar wind nebulae and a few tens of supernova remnants at average integral fluxes one order of magnitude lower than in the existing sample above 1 TeV, therefore opening the possibility to perform unprecedented population studies. The GPS also has the potential to provide new VHE detections of binary systems and pulsars, to confirm the existence of a hypothetical population of gamma-ray pulsars with an additional TeV emission component, and to detect bright sources capable of accelerating particles to PeV energies (PeVatrons). Furthermore, the GPS will constitute a pathfinder for deeper follow-up observations of these source classes. Finally, we show that we can extract from GPS data an estimate of the contribution to diffuse emission from unresolved sources, and that there are good prospects of detecting interstellar emission and statistically distinguishing different scenarios. Thus, a survey of the entire Galactic plane carried out from both hemispheres with CTAO will ensure a transformational advance in our knowledge of Galactic VHE source populations and interstellar emission.
Keywords: very-high-energy gamma rays, Cherenkov Telescope Array Observatory, CTAO Galactic Plane Survey, galactic cosmic rays, pulsar wind nebulae, supernova remnants, galactic PeVatrons, binary systems, diffuse emission
Published in RUNG: 28.10.2024; Views: 243; Downloads: 0
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47. La letteratura slovena prodotta in Italia in un contesto interculturale : l'esempio di GoriziaAna Toroš, 2023, independent scientific component part or a chapter in a monograph Abstract: The article presents a brief account of Slovene literature in the territory of present-day Friuli Venezia Giulia in Italy. The central part of the article focuses on the literature of Gorizia authors about Gorizia, as literature in a distinctly intercultural context. To this end, some literary works spatially located in the city of Gorizia and written in four different languages - Slovene, Italian, Friulian and German - are examined in more detail, looking for their spatial and ideological overlaps.
Keywords: Gorizia, A. Gradnik, S. Gregorčič, F. Bevk, C. Macor, C. R. Michestaedter, F. K. Zimmermann, Ivo Volkmar
Published in RUNG: 25.10.2024; Views: 258; Downloads: 0
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48. Ivo Andrić in SlovenkeDarko Ilin, 2023, published scientific conference contribution Abstract: V prvem delu članka je predstavljena Andrićeva reprezentacija Slovenk v potopisnem in esejističnem diskurzu v ZNAMENJU OB POTI (ZNAKOVI PORED PUTA, 1976) in tekstu O POČITNICAH V SLOVENIJI (O LETOVANJU U SLOVENIJI, 1981). Njegovi opisi slovenske ženske so analizirani z vidika študijev spolov in ženskih podob v cilju razumevanja pomena izpostavljenih značilnosti Andrićevih Slovenk. Drugi del članka je posvečen povezanosti Iva Andrića z ženskami slovenskega literarnega sistema. Poudarjeno je nekaj ključnih točk, kot so Andrićev prevod Vide Jeraj v srbohrvaščino, njegovo pismo ob smrti Zofke Kveder ter odzivi Mire Mihelič in Zlate Vokač na njegovo delo.
Keywords: recepcija, reprezentacija žensk, srbski književniki
Published in RUNG: 25.10.2024; Views: 196; Downloads: 0
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49. Nickel-decorated ZnO nanoparticles for effective solar reduction of hexavalent chromium and removal of selected pharmaceuticalsMiha Ravbar, Ksenija Maver, Tilen Knaflič, Iztok Arčon, Nataša Novak Tušar, Urška Lavrenčič Štangar, Andraž Šuligoj, 2025, original scientific article Abstract: The efficient visible light driven photocatalytic reduction of hexavalent chromium, Cr(VI) was demonstrated using ZnO nanoparticles (NPs) decorated with oxo-clusters of transition metals. The ZnO NPs were synthesized by a facile one-pot solvothermal synthesis followed by a fast microwave-assisted (MW) grafting of transition metals on the surface of NPs. Nickel was found to be the most active transition metal for photocatalytic activity as demonstrated by reduction of Cr(VI) to Cr(III). The optimally grafted samples contained 0.5 wt% Ni and increased photocatalytic activity by almost one-fold. The oxo-clusters did not enter the lattice of ZnO but rather resided on the surface and their efficient bonding to the ZnO surface was proved by Raman, TEM and X-Ray absorption techniques. Influence of MW power was studied and shown that excessive power load leads to formation of elongated structures of ZnO which decreases the photocatalytic activity. It was demonstrated by measuring fluorescent radical products that electrons, efficiently transferred via oxygen, were the main active species in combination with the unchanged oxidation power of holes and • OH in the grafted samples. The applicability of the materials was tested in immobilized plug flow photoreactor system degrading five pharmaceuticals simultaneously where their long-term use was shown.
Keywords: Zinc oxide, Pharmaceuticals, Grafting, Cr(VI), Zn XANES, Zn EXAFS
Published in RUNG: 24.10.2024; Views: 245; Downloads: 3
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50. Življenje sužnjev v obdobju starega Rima ter njihove omembe na epigrafskih spomenikih v provincialnem mestu Celeja : diplomsko deloLuka Podgornik, 2024, undergraduate thesis Abstract: Delo zavzema raziskovanje suženjskega vsakdana v času starega Rima ter omembe sužnjev na epigrafskih spomenikih v nekdanjem rimskem provincialnem mestu Celeja.
Rimsko cesarstvo je bilo v svojem času zelo razvito, zato so rimski voditelji iz dneva v dan želeli več, tako v razvitosti kot tudi pri geografski širitvi. Ker pa je bilo idej veliko, delovne sile, ki bi jih uresničila pa ne, so v Rimu začeli uveljavljati družbenogospodarsko ureditev, ki je danes poznana pod terminom suženjstvo.
Keywords: diplomske naloge, obdobje starega Rima, suženjstvo, suženjska dela, gladiatorji, gladiatorske šole, Kolosej, krščanstvo, epigrafski spomeniki, Celeia
Published in RUNG: 24.10.2024; Views: 184; Downloads: 4
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