161. Do Slavic secondary imperfectives contain multiple theme vowels?Stefan Milosavljević, Marko Simonović, Boban Arsenijević, Petra Mišmaš, Franc Marušič, Rok Žaucer, 2021, published scientific conference contribution abstract Keywords: Slavic, morphology, secondary imperfectives, theme vowels
Published in RUNG: 17.05.2021; Views: 1989; Downloads: 62
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164. The energy spectrum of ultra-high energy cosmic rays measured at the Pierre Auger Observatory and at the Telescope ArrayOlivier Deligny, Andrej Filipčič, Gašper Kukec Mezek, Jon Paul Lundquist, Samo Stanič, Marta Trini, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, Lukas Zehrer, 2019, published scientific conference contribution Keywords: ultra-high energy cosmic rays (UHECR), UHECR energy spectrum, Pierre Auger Observatory, Telescope Array
Published in RUNG: 10.05.2021; Views: 1965; Downloads: 67
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165. Measurement of the fluctuations in the number of muons in extensive air showers with the Pierre Auger ObservatoryA. Aab, Andrej Filipčič, Gašper Kukec Mezek, Jon Paul Lundquist, Samo Stanič, Marta Trini, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, Lukas Zehrer, 2021, original scientific article Keywords: ultra-high energy cosmic rays, extensive air showers (EAS), EAS muonic component, hadronic interaction models, Pierre Auger Observatory
Published in RUNG: 29.04.2021; Views: 2140; Downloads: 0
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167. Calibration of the underground muon detector of the Pierre Auger ObservatoryA. Aab, Andrej Filipčič, Jon Paul Lundquist, Samo Stanič, Marta Trini, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, Lukas Zehrer, 2021, original scientific article Abstract: To obtain direct measurements of the muon content of extensive air showers with energy above 10[sup]16.5 eV, the Pierre Auger Observatory is currently being equipped with an underground muon detector (UMD), consisting of 219 10 m[sup]2-modules, each segmented into 64 scintillators coupled to silicon photomultipliers (SiPMs). Direct access to the shower muon content allows for the study of both of the composition of primary cosmic rays and of high-energy hadronic interactions in the forward direction. As the muon density can vary between tens of muons per m[sup]2 close to the intersection of the shower axis with the ground to much less than one per m[sup]2 when far away, the necessary broad dynamic range is achieved by the simultaneous implementation of two acquisition modes in the read-out electronics: the binary mode, tuned to count single muons, and the ADC mode, suited to measure a high number of them. In this work, we present the end-to-end calibration of the muon detector modules: first, the SiPMs are calibrated by means of the binary channel, and then, the ADC channel is calibrated using atmospheric muons, detected in parallel to the shower data acquisition. The laboratory and field measurements performed to develop the implementation of the full calibration chain of both binary and ADC channels are presented and discussed. The calibration procedure is reliable to work with the high amount of channels in the UMD, which will be operated continuously, in changing environmental conditions, for several years.
Keywords: ultra-high energy cosmic rays, extensive air showers (EAS), EAS muonic component, Pierre Auger Observatory, underground muon detector, detector calibration
Published in RUNG: 14.04.2021; Views: 2684; Downloads: 139
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168. Analiza nabavnih virov v podjetju Ebm-papst in nadgradnja procesa odločanja z uporabo večkriterijskega odločitvenega modela : magistrsko deloMarko Peric, 2021, master's thesis Abstract: V magistrskem delu obravnavamo analizo nabavnih virov in nadgrajujemo proces odločanja z uporabo večkriterijskega odločitvenega modela. V izbranem podjetju Ebm-papst so se zaradi vedno večje konkurenčnosti in v želji kreiranja nabavnih prihrankov lotili iskanja novih nabavnih virov na področju jugovzhodne Evrope za blagovno skupino aluminijastih odlitkov. Z analizo smo ugotovili, da imajo v podjetju definiran zgolj proces ocenjevanja obstoječih dobaviteljev, zato smo se lotili nadgradnje procesa izbora novega dobavitelja. V prvem koraku smo na podlagi pregleda strokovne literature empirično proučili ter izpostavili najpomembnejše kriterije pri izboru novega dobavitelja. Ti so bili izbrani na podlagi matrike SPM in PPM. Za pridobivanje podatkov smo uporabili kvantitativno in kvalitativno znanstvenoraziskovalno metodo. Analizo smo opravili na podlagi izpolnjenih vprašalnikov ter ocenjevanj, opravljenih med obiskom pri dobaviteljih. Opravljen pa je bil tudi nestrukturiran globinski intervju s petimi strokovnjaki, nabavniki aluminijastih odlitkov. Zaradi kompleksnosti smo problem odločanja razdelili na dve stopnji. V prvi stopnji smo definirali izločitvene kriterije in s t testom preverili hipotezi. Pripravili smo odločitveni model z uporabo metode DEX ter definirali štiri strategije pristopa do novih dobaviteljev pri vključevanju teh v panel dobaviteljev, kar bo imelo praktične implikacije za izbrano podjetje in širše. Opravili smo vrednotenje dvanajstih dobaviteljev ter na podlagi praktičnih testov ocenili razviti model ter predlagali tudi izboljšave, vezane na model. V zaključku smo podali predloge izboljšav za celoten proces izbora novih dobaviteljev v izbranem podjetju.
Keywords: metoda DEX, dobavitelji, management, nabava, trženje, večkriterijsko odločanje, magistrske naloge
Published in RUNG: 22.03.2021; Views: 3433; Downloads: 156
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169. Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagationH. Abdalla, H. Abe, Fabio Acero, A. Acharyya, R. Adam, Christopher Eckner, Samo Stanič, Serguei Vorobiov, Gabrijela Zaharijas, Marko Zavrtanik, Danilo Zavrtanik, Miha Živec, 2021, original scientific article Abstract: The Cherenkov Telescope Array (CTA), the new-generation ground-based observatory for γ astronomy, provides unique capabilities to address significant open questions in astrophysics, cosmology, and fundamental physics. We study some of the salient areas of γ cosmology that can be explored as part of the Key Science Projects of CTA, through simulated observations of active galactic nuclei (AGN) and of their relativistic jets. Observations of AGN with CTA will enable a measurement of γ absorption on the extragalactic background light with a statistical uncertainty below 15% up to a redshift z=2 and to constrain or detect γ halos up to intergalactic-magnetic-field strengths of at least 0.3 pG . Extragalactic observations with CTA also show promising potential to probe physics beyond the Standard Model. The best limits on Lorentz invariance violation from γ astronomy will be improved by a factor of at least two to three. CTA will also probe the parameter space in which axion-like particles could constitute a significant fraction, if not all, of dark matter. We conclude on the synergies between CTA and other upcoming facilities that will foster the growth of γ cosmology.
Keywords: Cherenkov Telescope Array, active galactic nuclei, gamma-ray experiments, axions, extragalactic magnetic fields
Published in RUNG: 02.03.2021; Views: 2276; Downloads: 71
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170. Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centreA. Acharyya, R. Adam, C. Adams, I. Agudo, A. Aguirre-Santaella, Christopher Eckner, Samo Stanič, Serguei Vorobiov, Gabrijela Zaharijas, Marko Zavrtanik, Danilo Zavrtanik, Miha Živec, 2021, original scientific article Keywords: dark matter, gamma ray, astrophysics
Published in RUNG: 26.02.2021; Views: 2391; Downloads: 141
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