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131.
First utilization of magnetically-assisted photocatalytic iron ▫$oxide-TiO_2$▫ nanocomposites for the degradation of the problematic antibiotic ciprofloxacin in an aqueous environment
Josip Radić, Gregor Žerjav, Lucija Jurko, Perica Bošković, Lidija Fras Zemljič, Alenka Vesel, Andraž Mavrič, Martina Gudelj, Olivija Plohl, 2024, original scientific article

Abstract: The emergence of antimicrobial resistance due to antibiotics in the environment presents significant public health, economic, and societal risks. This study addresses the need for effective strategies to reduce antibiotic residues, focusing on ciprofloxacin degradation. Magnetic iron oxide nanoparticles (IO NPs), approximately 13 nm in size, were synthesized and functionalized with branched polyethyleneimine (bPEI) to obtain a positive charge. These IO-bPEI NPs were combined with negatively charged titanium dioxide NPs (TiO2@CA) to form magnetically photocatalytic IO-TiO2 nanocomposites. Characterization techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), infrared spectroscopy (IR), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), electrokinetic measurements, and a vibrating sample magnetometer (VSM), confirmed the successful formation and properties of the nanocomposites. The nanocomposites exhibited a high specific surface area, reduced mobility of photogenerated charge carriers, and enhanced photocatalytic properties. Testing the photocatalytic potential of IO-TiO2 with ciprofloxacin in water under UV-B light achieved up to 70% degradation in 150 min, with a degradation rate of 0.0063 min−1. The nanocomposite was magnetically removed after photocatalysis and successfully regenerated for reuse. These findings highlight the potential of IO-TiO2 nanocomposites for reducing ciprofloxacin levels in wastewater, helping curb antibiotic resistance.
Keywords: photocatalytic degradation, magnetic iron oxide-TiO2 nanocomposites, hetero-agglomeration, multifunctionality, antibiotic ciprofloxacin, antimicrobial resistance
Published in RUNG: 09.09.2024; Views: 436; Downloads: 6
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132.
133.
Search for a signal from dark matter sub-halos with the galactic plane survey of CTA Observatory : master's thesis
Zoja Rokavec, 2024, master's thesis

Abstract: Dark matter (DM), known to be a dominant matter component in the Universe, has been searched for extensively, yet remains undetected. One of the promising avenues of detecting a DM signal is to observe the so called ’DM sub-halos’ within our galaxy. These sub-halos, which are numerous within the Milky Way, are formed by the clustering of DM, as predicted by cosmological simulations, and most of them lack baryonic matter counterparts, making them challenging to detect. How- ever, the annihilation or decay of Weakly Interacting Massive Particles (WIMPs), a leading candidate for DM, within these sub-halos is expected to produce very high-energy (VHE) photons (called gamma-rays) at TeV energies, offering possible indirect DM detection. In this thesis, we focus on the Galactic Plane Survey (GPS) of the Cherenkov Tele- scope Array Observatory (CTAO), an upcoming ground-based gamma-ray obser- vatory, which promises unprecedented sensitivity and resolution in the detection of cosmic gamma-ray sources in the ∼ 30 GeV to ∼ 100 TeV energy range. As dark sub-halos are expected to appear as unidentified (point) sources in the CTAO GPS data, we employ a machine learning (ML)-based approach, the AutoSour- ceID framework, leveraging U-shaped networks (U-Nets) and Laplacian of Gaus- sian (LoG) filter, for automatic source detection and localization, and apply it to simulated GPS data. We establish detection thresholds for U-Nets trained on dif- ferently scaled counts (counts, square root or log of counts) and identify which approach offers best results (in terms of flux sensitivity and location accuracy). Our findings suggest that using log-scaled counts yields a factor of 1.7 lower flux threshold compared to counts alone. In addition, we compare our ML outcomes with traditional methods; however, this comparison is not straightforward, as ML and traditional approaches fundamentally differ in their methodologies and un- derlying assumptions. Nevertheless, The flux threshold obtained using log-scaled counts is comparable to that of the traditional likelihood-based detection method implemented in the Gammapy library, although further study is needed to estab- lish a more definitive comparison. These preliminary results also suggest that the flux threshold for detecting 90% of true sources with the ML approach is approx- imately two times lower than the sensitivity reported for the GPS in the CTAO publication. Although these results are not directly comparable due to differences in methodology, they hint that ML methods may offer superior performance in certain scenarios. Furthermore, we discuss the implications of our results on the sensitivity to DM sub-halos, improving it by a factor of 4, highlighting the possi- bility of detecting at least one sub-halo with a cross section approximately ⟨σv⟩ = 2.4 × 10−23 cm3 /s.
Keywords: Cherenkov Telescope Array Observatory, dark matter, sub-halos, machine learning, gamma-rays, master's thesis
Published in RUNG: 06.09.2024; Views: 468; Downloads: 7
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134.
Kako je razvoj novih tehnologij vplival na filmsko industrijo : diplomsko delo
Staš Zupanc, 2024, undergraduate thesis

Abstract: Rast in napredek filmske industrije sta se skozi leta skokovito širila. Očetje filma, kot so Edison, Muybridge in brata Lumiere, so že pred več kot 100 leti ustvarili temelje, na katerih gradimo še danes. Razvoj novih tehnologij, kot so uporaba zvoka v filmu, barvne slike ter kasneje še računalniško ustvarjenih vidnih učinkov, je imelo in še ima zelo močan pozitivni vpliv na celotno filmsko industrijo. Digitalne filmske kamere in digitalna video montaža sta precej poenostavili produkcijo filmov ter režiserjem odprla popolnoma nova obzorja idej. Meja za takšne ali drugačne presežne izjemnosti v filmih je postala le avtorjeva ustvarjalnost. Finančni in logistični problemi so se zmanjšali, celotna proizvodnja avdio vizualnih vsebin pa je postala dostopna tudi širši javnosti. Kljub vsej tehnologiji in trenutni zlati dobi filma, pa se z uporabo umetne inteligence stalen razvoj filmskega sveta še dolgo ne bo ustavil.
Keywords: zgodovina filma, filmska industrija, filmski trak, digitalizacija, filmske kamere, montaža, ustvarjalnost, umetna inteligenca, pametni telefoni, spletne podlage, diplomske naloge
Published in RUNG: 05.09.2024; Views: 517; Downloads: 8
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135.
Gases
Alojz Kodre, Iztok Arčon, Jana Padežnik Gomilšek, 2024, scientific entry in dictionary, encyclopaedia or lexicon

Abstract: X-ray absorption spectroscopy of gases is seldom used for structural analysis, except in as much as the extended X-ray absorption fine-structure (EXAFS) signal is used to monitor some specific molecular process. Gas spectroscopy, however, has been the main tool in the systematic study of higher-order photoabsorption processes, multielectron photoexcitations (MEEs), which were introduced with an experiment at the K edge of argon. Along with noble gases, where MEEs are studied in the pure form, free of the structural signal, measurements have been extended to monatomic metal vapours, although at the cost of considerable experimental difficulties. Several types of absorption cells have been devised, among them the ceramic double cell and the heat-pipe cell for experiments in the low-energy region. In a high-temperature oven with considerable technical refinement, edge profiles of nonvolatile metals were measured up to 2500 K. Edge profiles and MEEs, which are strongly dependent on electron correlation, provide sensitive tests of the theory of atomic and molecular structure.
Keywords: X-ray absorption spectroscopy, absorption cells, gas and vapour samples, multielectron photoexcitation, effects of electron correlation
Published in RUNG: 05.09.2024; Views: 494; Downloads: 4
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136.
How stars get thorn apart by supermassive black holes
Andreja Gomboc, 2024, published scientific conference contribution abstract (invited lecture)

Keywords: astronomija, črne luknje, observatorij Vere Rubin
Published in RUNG: 03.09.2024; Views: 453; Downloads: 3
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137.
Videorazglednica iz Urugvaja in predstavitev Agustine De Vera, nove rezidentke v humanistični rezidenci Branislave Sušnik : Medvode, 12. 9. 2023
Barbara Pregelj, 2023, other performed works

Abstract: Dogodek v Knjižnici Medvode
Keywords: Urugvaj, video, Branislava Sušnik, humanistična rezidenca
Published in RUNG: 02.09.2024; Views: 463; Downloads: 3
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138.
Okrogla miza o skupinskem prevajanju dela Grigor in čebela Juana Kruza Igerabideja : Ljubljana, Vrt Lili Novy, 6. 6. 2024
Barbara Pregelj, 2024, other performed works

Abstract: Sodelujejo študentke in študent hispanistike s FF in obe mentorici.
Keywords: prevajanje, skupnostno prevajanje, baskovska literatura
Published in RUNG: 02.09.2024; Views: 503; Downloads: 3
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139.
Potovanje k literaturi s pomočjo bralnomotivacijskih strategij : predavanje na bralnem seminarju Vesolje med vrsticami: kako ponuditi otrokom literaturo kot dogodek, Ljubljana, 30. 5. 2023
Barbara Pregelj, 2023, unpublished conference contribution

Abstract: Na predavanju so bile praktično predstavljene bralnomotivacijske strategije M. Sarto in delo z literarnimi besedili.
Keywords: strategije, motiviranje za branje, Malinc, M. Sarto
Published in RUNG: 02.09.2024; Views: 430; Downloads: 3
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140.
Katalonska književnost pri nas: avtorji, prevodi, publika : okrogla miza v okviru Dnevov katalonske književnosti, 6. 4. 2023
Barbara Pregelj, 2023, other performed works

Abstract: Pogovor o prevodih katalonskih avtorjev v slovenščino ter položaju katalosnke literature na Iberskem polotoku.
Keywords: prevodi, katalonska literatura, S. Škrabec, V. Rot
Published in RUNG: 30.08.2024; Views: 497; Downloads: 3
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