51. |
52. |
53. |
54. |
55. Analiza finančne uspešnosti gospodarskih družb v občini Ajdovščina in občini Vipava : magistrsko deloAndreja Petrič, 2022, master's thesis Abstract: Namen magistrskega dela je bil raziskati in preučiti strokovno literaturo konstrukta uspešnosti ter prikaz meril in kazalnikov, s pomočjo katerih je uspešnost mogoče ugotavljati. Analizo smo opravili s pomočjo enajstih dostopnih kazalnikov o uspešnosti v javno dostopni bazi GVIN Bisnode. V empiričnem delu smo opravili sistematičen pregled izbranih finančnih meril in kazalnikov v 111 podjetjih v občinah Ajdovščina in Vipava za obdobje 2019 ter jih medsebojno primerjali in komentirali. Iz vsake gospodarske dejavnosti smo pridobili maksimume, minimume, srednje vrednosti in odstopanje določenega rezultata pri naslednjih kazalnikih: dodana vrednost, EBITDA, ROE, ROA, gospodarnost poslovanja, denarni cikel in enostavni denarni tok. Ob koncu empiričnega dela smo predstavili ključne rezultate in jim dodali analizo srednje vrednosti vseh rezultatov in odstopanje. V zaključnem delu magistrske naloge smo podali predloge za morebitno nadaljnje raziskovanje iz vsebinskega in metodološkega vidika.
Keywords: Ajdovščina, Vipava, analize, finančni kazalniki, management, podjetja, uspešnost, magistrske naloge
Published in RUNG: 24.01.2022; Views: 2190; Downloads: 107
 Full text (1,30 MB)
This document has many files! More... |
56. |
57. Tidal Disruption Events seen through the eyes of Vera C. Rubin ObservatoryKatja Bučar Bricman, 2021, doctoral dissertation Abstract: Tidal Disruption Events (TDEs) are rare transients, which are considered to be promising tools in probing supermassive black holes (SMBHs) and their environments in quiescent galaxies, accretion physics, and jet formation mechanisms. The majority of $\approx$ 60 detected TDEs has been discovered with large field of view time-domain surveys in the last two decades. Currently, about 10 TDEs are discovered per year, and we expect this number will increase largely once the Legacy Survey of Space and Time (LSST) at Vera C. Rubin Observatory begins its observations.
In this work we demonstrate and explore the capabilities of the LSST to study TDEs. To begin with, we simulate LSST observations of TDEs over $10$ years of survey duration by including realistic SED models from MOSFiT into the simulation framework of the LSST. SEDs are then converted into observed fluxes and light curves are simulated with the LSST observing strategy minion_1016. Simulated observations are used to estimate the number of TDEs the LSST is expected to observe and to assess the possibility of probing the SMBH mass distribution in the Universe with the observed TDE sample. We find that the LSST has a potential of observing ~1000 TDEs per year, the exact number depending on the SMBH mass distribution and the adopted observing strategy. In spite of this large number, we find that probing the SMBH mass distribution with LSST observed TDEs will not be straightforward, especially at the low-mass end. This is largely attributed to the fact that TDEs caused by low-mass black holes ($\le 10^6 M_\odot$) are less luminous and shorter than TDEs by heavier SMBHs ($> 10^6 M_\odot$), and the probability of observationally missing them with LSST is higher.
Second, we built a MAF TDE metric for photometric identification of TDEs based on LSST data. We use the metric to evaluate the performance of different proposed survey strategies in identifying TDEs with pre-defined identification requirements. Since TDEs are blue in color for months after peak light, which separates them well from SNe and AGN, we include u-band observations as one of the criteria for a positive identification. We find that the number of identified TDEs strongly depends of the observing strategy and the number of u-band visits to a given field in the sky. Observing strategies with a larger number of u-band observations perform significantly better. For these strategies up to 10% of LSST observed TDEs satisfy the identification requirements.
Keywords: Ground-based ultraviolet, optical and infrared telescopes
Astronomical catalogs, atlases, sky surveys, databases, retrieval systems, archives, Black holes, Galactic nuclei (including black holes), circumnuclear matter, and bulges, Infall, accretion, and accretion disks
Published in RUNG: 03.01.2022; Views: 2698; Downloads: 60
Full text (124,61 MB) |
58. GRB 191016A : a highly collimated gamma-ray burst jet with magnetized energy injectionM. Shrestha, Iain A. Steele, S. Kobayashi, N. Jordana-Mitjans, R. J. Smith, H. Jermak, Dirk Arnold, Carole G. Mundell, Andreja Gomboc, Cristiano Guidorzi, 2022, original scientific article Keywords: astronomija, astrofizika, izbruhi sevanja gama
Published in RUNG: 03.01.2022; Views: 1467; Downloads: 37
 Link to full text
This document has many files! More... |
59. |
60. |
