1. Strongly lensed supernovae, the past and the future : lecture at the University of Cambridge, 26. 6. 2024Tanja Petrushevska, 2024, invited lecture at foreign university Abstract: The searches and observations of supernovae (SNe) have been motivated by the fact that they are exceptionally useful for various astrophysical and cosmological applications. Most prominently, Type Ia SNe (SNe Ia) have been used as distance indicators showing that the expansion rate of the Universe is accelerating. The strong gravitational lensing effect provides another powerful tool and occurs when a foreground mass distribution is located along the line of sight to a background source. It can happen so that galaxies and galaxy clusters can act as “gravitational telescopes”, boosting the faint signals from distant SNe and galaxies. Thanks to the magnification boost provided by the gravitational telescope, we are able to probe galaxies and SNe that otherwise would be undetectable. Therefore, the combination of the two tools, SNe and strong lensing, in the single phenomenon of strongly lensed SNe, provides a powerful simultaneous probe of several cosmological and astrophysical phenomena. By measuring the time delays of strongly lensed supernovae and having a high-quality strong lensing model of the galaxy cluster, it is possible to measure the Hubble constant with competitive precision. In this talk, I will present some of the past and recent results that have been possible due to the observations of strongly lensed supernovae and anticipate what we can expect in the future from the upcoming telescope surveys, such as the Vera C. Rubin Observatory and Nancy G. Roman Space Telescope.
Keywords: supernova, strong lensing, Hubble constant
Published in RUNG: 26.06.2024; Views: 1; Downloads: 2
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2. Enhancing optical biosensing : comparing two physical treatments for GPTES chemical functionalization of cyclo-olefin copolymer foilBarbara Ressel, Jurij Urbančič, Marco Beltrami, Erik Betz-Güttner, Cinzia Cepek, Martina Conti, Ayesha Farooq, Patrizia Melpignano, 2024, original scientific article Abstract: Cyclo-olefin-copolymer (COC) transparent films are currently the best choice for micro-fluidic bio-sensors for point-of-care diagnostic applications using optical signal detection. However, while the optical and mechanical properties of this polymer are extremely good, the adhesion of the bio-probes on this surface is not optimal, due to its chemical structure, that presents only saturated carbon bonds. The deposition of organo-silane molecules on the COC surface is one of the most effective ways to overcome this problem. But, for the surface functionalization, a surface physical treatment is necessary before the chemical modification of the COC surface. In this paper a comparison of the effectiveness of two different physical treatments, oxygen plasma and UV-ozone, is reported. In particular, the exposure time of the UV-Ozone treatment has been selected to avoid the problem of auto-fluorescence of the modified COC surface, that was observed also for relatively short UV exposure (around 10 minutes). An investigation of the reactive radicals created on the surface after the physical treatments and the following chemical modification with the organo-silane molecule (GPTES) has been performed using X-ray photoemission spectroscopy. The surface energy and morphology of the films have been also measured by contact angle and optical profilometry. Finally, the bio-probes adhesion performances of the COC surfaces obtained with the two physical treatments and the chemical modification were tested in a fluorescence-based assay, using an organic light emission diode to excite the fluorescence. We observed that the UV-ozone treatment allows to obtain a siloxane network with some reactive epoxy radicals on the COC surface, however, their quantity and distribution are less important and homogeneous than in the oxygen plasma treated surfaces.
Keywords: cyclo-olefin-copolymers, organo-silane, oxygen plasma, UV-ozone, XPS, OLED
Published in RUNG: 26.06.2024; Views: 0; Downloads: 0
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3. Tunable emissive ▫$CsPbBr_3 /Cs_4PbBr_6$▫ quantum dots engineered by discrete phase transformation for enhanced photogating in field-effect phototransistorsHan Xiao, Siyuan Wan, Lin He, Junlong Zou, Andraž Mavrič, Yixi Wang, Marek Piotrowski, Anil Kumar Bandela, Paolo Samorì, Zhiming M. Wang, 2024, original scientific article Abstract: Precise control of quantum structures in hybrid nanocrystals requires advancements in scientific methodologies. Here, on the design of tunable CsPbBr3/Cs4PbBr6 quantum dots are reported by developing a unique discrete phase transformation approach in Cs4PbBr6 nanocrystals. Unlike conventional hybrid systems that emit solely in the green region, this current strategy produces adjustable luminescence in the blue (450 nm), cyan (480 nm), and green (510 nm) regions with high photoluminescence quantum yields up to 45%, 60%, and 85%, respectively. Concentration‐dependent studies reveal that phase transformation mechanisms and the factors that drive CsBr removal occur at lower dilutions while the dissolution–recrystallization process dominates at higher dilutions. When the polymer‐CsPbBr3/Cs4PbBr6 integrated into a field‐effected transistor the resulting phototransistors featured enhanced photosensitivity exceeding 105, being the highest reported for an n‐type phototransistor, while maintaining good transistor performances as compared to devices consisting of polymer‐CsPbBr3 NCs.
Keywords: crystallization mechanisms, dilution-induced kinetic trapping, photogating effect, phototransistors, quantum dots
Published in RUNG: 26.06.2024; Views: 18; Downloads: 0
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4. Prenova sistema reševanja reklamacij v podjetju Led Luks d.o.o. : diplomsko deloVid Sirk, 2024, undergraduate thesis Abstract: Učinkovito upravljanje reklamacij je ključnega pomena za ohranjanje zadovoljstva strank in dolgoročni uspeh podjetja. Podjetja, ki imajo dobro organiziran sistem sprejema in obdelave reklamacij, lahko hitro in učinkovito rešujejo težave strank, kar poveča zaupanje v podjetje. Poleg tega lahko s pomočjo zbranih podatkov o reklamacijah izboljšujejo kakovost izdelkov in storitev ter povečujejo konkurenčnost na trgu.
V diplomskem delu se s pomočjo digitalizacije osredotočamo na optimizacijo sistema reševanja reklamacij v podjetju Led Luks, d. o. o. Najprej so predstavljene prednosti digitalizacije, nato pa je opisan postopek načrtovanja in izdelove aplikacije za upravljanje reklamacij. V nadaljevanju so predstavljeni začetno stanje v podjetju, končno stanje po implementaciji sistema ter ocena učinkovitosti novega sistema. Namen diplomskega dela je prikazati izboljšanje stanja po implementaciji nove metode za obravnavo reklamacij in predstaviti prednosti, ki jih ta prinaša. Primer izboljšave se kaže v času vrnitve reklamacijskih vprašalnikov, ki so bili poslani strankam, saj se je ta skrajšal z enega dne in pol na en dan. To za stranke pomeni eno tretjino krajšo čakalno dobo za odgovor.
Keywords: diplomske naloge, reklamacije, podjetja, digitalizacija, RMA
Published in RUNG: 26.06.2024; Views: 12; Downloads: 0
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5. Processing feature assignment in Bulgarian : lecture at the Beyond Agreement Workshop, Geneve, 20. 6. 2024Danil Khristov, Penka Stateva, Julie Franck, Dávid György, Arthur Stepanov, 2024, unpublished conference contribution Keywords: Sentence processing, psycholinguistics, memory, feature assignment, Bulgarian
Published in RUNG: 26.06.2024; Views: 21; Downloads: 0
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9. Analiza 90 slovenskih romanov in opusa Ivana Cankarja z računalniško stilometrijoIvana Zajc, 2024, original scientific article Abstract: Članek predstavi oddaljeno branje slovenske književnosti iz obdobij slovenskega literarnega realizma in moderne. Prvi del članka vsebuje prikaz rezultatov računalniške stilometrične analize korpusa 90 slovenskih romanov iz omenjenih obdobij, izvedene v programskem okolju R s paketom Stylometry with R. Analiza je pokazala, da je ključni signal, po katerem se vključeni romani medsebojno razlikujejo, avtorski, pri čemer najbolj izstopajo romani Pavline Pajk in Ivana Cankarja. Ker je izstopanje najbolj izrazito pri Pavlini Pajk, članek predstavi tudi stilometrično raziskavo besedišča, ki je za njene romane najznačilnejše. Na tej podlagi članek ponudi sklep, da k specifičnosti njenih romanov med drugim prispeva žanr sentimentalnega ljubezenskega romana, ki zaznamuje njen opus. V drugem delu članka je z isto metodo analiziran Cankarjev literarni opus, v korpus pa so poleg romanov vključena tudi njegova druga dela iz različnih ustvarjalnih obdobij. Iz rezultatov analize sta razvidna obdobni in žanrski razvoj Cankarjevega literarnega sloga.
Keywords: slovenski roman, oddaljeno branje, računalniška stilometrija, digitalna humanistika
Published in RUNG: 24.06.2024; Views: 93; Downloads: 3
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10. Veliki podatki, male literature : (predgovor)Lucija Mandić, Ivana Zajc, 2024, preface, editorial, afterword Keywords: digitalna humanistika, digitalni obrat, digitalna literarna veda, književnost
Published in RUNG: 24.06.2024; Views: 90; Downloads: 2
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