31. Massive stars exploding in a He-rich circumstellar medium - X : flash spectral features in the Type Ibn SN 2019cj and observations of SN 2018jmtZ.-Y. Wang, A. Pastorello, K. Maeda, A. Reguitti, Y.-Z. Cai, D. Andrew Howell, S. Benetti, Mateusz Bronikowski, E. Concepcion, Tanja Petrushevska, 2024, izvirni znanstveni članek Opis: We present optical and near-infrared observations of two Type Ibn supernovae (SNe), SN\,2018jmt and SN\,2019cj. Their light curves have rise times of about ten days, reaching an absolute peak magnitude of $M_g$(SN\,2018jmt) = $-$19.07 pm 0.37 and $M_V$(SN\,2019cj) = $-$18.94 pm 0.19 mag, respectively. The early-time spectra of SN\,2018jmt are dominated by a blue continuum, accompanied by narrow (600$-$1000 km $) He i lines with the P-Cygni profile. At later epochs, the spectra become more similar to those of the prototypical SN Ibn 2006jc. At early phases, the spectra of SN\,2019cj show flash ionisation emission lines of C iii N iii and He ii superposed on a blue continuum. These features disappear after a few days, and then the spectra of SN\,2019cj evolve similarly to those of SN\,2018jmt. The spectra indicate that the two SNe exploded within a He-rich circumstellar medium (CSM) lost by the progenitors a short time before the explosion. We modelled the light curves of the two SNe Ibn to constrain the progenitor and the explosion parameters. The ejecta masses are consistent with either what is expected for a canonical SN Ib (sim 2 odot $) or for a massive Wolf Rayet star ($>$ sim 4 M$_ odot $), with the kinetic energy on the order of $10^ $ erg. The lower limit on the ejecta mass ($>$ sim 2 M odot $) argues against a scenario involving a relatively low-mass progenitor (e.g. $M_ ZAMS $ sim 10 M$_ odot $). We set a conservative upper limit of sim 0.1 M$_ odot $ for the 56Ni masses in both SNe. From the light curve modelling, we determined a two-zone CSM distribution, with an inner, flat CSM component and an outer CSM with a steeper density profile. The physical properties of SN\,2018jmt and SN\,2019cj are consistent with those expected from the core collapse of relatively massive envelope-stripped stars.
Ključne besede: supernovae
Objavljeno v RUNG: 06.11.2024; Ogledov: 180; Prenosov: 3
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33. Spremljanje vhodnega materiala in kontrola kakovosti skozi proizvodni proces : diplomsko deloIvan Devetak, 2024, diplomsko delo Ključne besede: diplomske naloge, kakovost, vhodna kontrola, reklamacije, certifikati, Futon, proizvodni proces, merilni pripomočki, tehnične risbe, informacijski sistem Infor
Objavljeno v RUNG: 05.11.2024; Ogledov: 185; Prenosov: 3
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34. Uvajanje novega izdelka na izbrani ciljni trg, primer teranov liker Srdelin : diplomsko deloRok Frančeškin, 2024, diplomsko delo Opis: Domačija Srdelin iz Tomaja na Krasu ima bogato tradicijo v pridelovanju vinske sorte refošk, vina teran ter teranovega likerja. Bogato znanje v pridelavi se je uspešno prenašalo in nadgrajevalo iz generacije v generacijo, vse do današnjega časa, ko je domači pridelek teranov liker dosegel stopnjo dovršenosti v okusu in tehnologiji pridelave, da ga je mogoče ponuditi širši javnosti. Domačija Srdelin že prodaja svoje izdelke v obliki dopolnilne dejavnosti in jih v omejenih količinah že trži. Srdelinov liker se na trgu razlikuje po svoji dolgi tradiciji pridelave in inovativnosti okusov in postopka staranja. S posebnimi tehnikami proizvodnje se lahko pohvali z gladkejšo teksturo in intenzivnejšimi okusi.
Diplomsko delo vsebuje strategijo prodaje teranovega likerja Srdelin za izbrani ciljni trg. Metodološki del diplomskega dela vsebuje podrobno opredelitev osnovnih pojmov. Podrobneje je opisan razvoj in uvajanje novih izdelkov na trg, predstavljen pa je tudi model razvojnega procesa po Kotlerju.
V eksperimentalnem delu je podrobneje predstavljen izdelek in njegova pridelava. V tem delu je predstavljena analiza trga z obstoječimi izdelki in konkurenti domačije. Predstavljeni so ključni uporabniki teranovega likerja. Na tem področju je bila izvedena SWOT analiza, predstavljeni so profili ciljnega kupca (buyer persona) predstavljeni pa so še glavni elementi diverzifikacije izdelka.
Ključne besede: diplomske naloge, teranov liker, alkoholne pijače, kras, teran, likerji, domačija Srdelin
Objavljeno v RUNG: 05.11.2024; Ogledov: 171; Prenosov: 0
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36. Łukasiewicz anti fuzzy subalgebras of BCK/BCI-algebrasJeong Gi Kang, Hashem Bordbar, 2025, izvirni znanstveni članek Opis: The subalgebra of BCK/BCI-algebra using Łukasiewicz anti fuzzy set
introduced by Jun is studied in this article. The concept of Łukasiewicz anti
fuzzy subalgebra of a BCK/BCI-algebra is introduced, and several properties are
investigated. The relationship between anti fuzzy subalgebra and Łukasiewicz anti
fuzzy subalgebra is given, and characterization of a Łukasiewicz anti fuzzy subalgebra
is discussed. Conditions are found in which a Lukasiewicz anti fuzzy set is a
Lukasiewicz anti fuzzy subalgebra Finally, conditions under which ⋖-subset, Υsubset, and anti-subset become subalgebra are explored.
Ključne besede: anti fuzzy subalgebra, Łukasiewicz anti fuzzy set, Łukasiewicz anti fuzzy, subalgebra, Υ-subset, anti subset
Objavljeno v RUNG: 30.10.2024; Ogledov: 288; Prenosov: 0
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37. 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, izvirni znanstveni članek Opis: 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.
Ključne besede: Encore
Objavljeno v RUNG: 29.10.2024; Ogledov: 247; Prenosov: 1
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38. 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, izvirni znanstveni članek Ključne besede: material characterization, biocompatible materials, chitosan, sporopollenin exine capsules, beam deflection spectrometry
Objavljeno v RUNG: 29.10.2024; Ogledov: 216; Prenosov: 0
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40. 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, izvirni znanstveni članek Opis: 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.
Ključne besede: black carbon, aerosol absorption, source apportionment, mass absorption cross-section
Objavljeno v RUNG: 29.10.2024; Ogledov: 227; Prenosov: 0
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