1761. Normal covers of 2-arc-transitive graphs of prime-power orderMarston D. E. Conder, Primož Potočnik, 2025, original scientific article Abstract: In a paper by Cai Heng Li in Bull. London Math. Soc. 33 (2001), it was suggested that ‘non-basic’ $2$-arc-transitive graphs of prime-power order that occur as normal covers of smaller $2$-arc-transitive graphs might be rare and difficult to construct. This note describes some of the background to Li’s suggestion, and gives some examples of small valency, and then goes on to show that in fact there are infinitely many examples of valency $d$, for every integer $d \ge 2$. It is also noted that the hypercubes $(Q_n)$ for $n \ge 4$ even, together with a $2$-arc-transitive group $G$ of index $2$ in ${\rm Aut}(Q_n)$, show that the claims of Corollary 1.2 in the above paper by Li are not quite correct.
Keywords: graphs, s-arc-transitive, normal cover
Published in DiRROS: 07.07.2025; Views: 327; Downloads: 199
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1763. An analysis of PIRLS 2021 mode effects : differences in reading achievement related to the assessment mode for PIRLS 2021 in Croatia and SloveniaEva Klemenčič Mirazchiyski, Plamen Mirazchiyski, Ines Perović, 2025, independent scientific component part or a chapter in a monograph Abstract: This chapter analyzes the differences in reading achievements related to different assessment modes (digital and paper) among students in Croatia and Slovenia using IEA’s Progress in International Reading Literacy Study (PIRLS) 2021 data. It focuses on the relationship various ICT-related variables may have with the reading achievement by the mode of administration. The findings revealed no significant differences in average reading scores between the two modes, with both education systems showing similar outcomes. Although differences in achievement between the two modes could not be detected, nuances emerged regarding the association between ICT variables and reading achievement. Notably, ownership and the sharing of digital devices like smartphones indicated contrasting impacts for each country, suggesting country-specific digital divides. Additionally, while certain ICT resources seemed to marginally benefit reading scores, the general lack of significant disparities between digital and paper assessments highlights the complex interplay of factors influencing educational outcomes. Digital self-efficacy is related to reading achievement only in Slovenia. The study outlined in this chapter calls for nuanced understanding and policy interventions considering these subtle yet crucial differences.
Keywords: education, reading literacy, PIRLS 2001, reading achievement, assessment mode, digital self-efficacy, Croatia, Slovenia
Published in DiRROS: 07.07.2025; Views: 384; Downloads: 232
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1764. The impact of different types of self-regulation scaffolds on learning science with hypermediaAlenka Gril, Anja Podlesek, Luka Komidar, Alenka Kavčič, Katja Depolli Steiner, Sonja Pečjak, Tina Pirc, Melita Puklek Levpušček, Bojana Boh Podgornik, Aleš Hladnik, Ciril Bohak, Matevž Pesek, Žiga Lesar, Matija Marolt, Cirila Peklaj, 2025, original scientific article Abstract: Effective use of scaffolds in hypermedia should support students' self-regulated learning while considering their individual differences. Metacognitive and cognitive scaffolds, but not motivational scaffolds, have been extensively researched. There is no clear evidence that using only one type of scaffold is more effective than combining different types. The aim of this study was to determine if the use of different types of scaffolds and their combination in hypermedia predicts learning achievement over and above individual student differences. In the first phase of our quasi-experimental study, 443 ninth graders learned about visual perception in hypermedia. We measured their individual characteristics (grade point average [GPA], intelligence [IQ], learning time, and the number of learning strategies used) and their learning achievement and divided them into six comparable groups. In the second phase, the groups learned about olfactory perception using different scaffolds embedded in hypermedia: 6 cognitive, 6 metacognitive, 6 motivational, all 18 scaffolds together, a selected subset of 6 mixed scaffolds, and no scaffolds. We administered a pre-test and a post-test to assess what students learned, and collected data on students’ note-taking, self-reported use of learning strategies, and interest in the topic. Hierarchical regression analysis of data from 288 students revealed that students with a higher GPA, specific prior knowledge and interest in the topic, and those who used more self-regulation strategies learned more. Scaffolds did not significantly contribute to the prediction of learning outcomes. Implications for the research design of studies investigating the effects of learning scaffolds in hypermedia are discussed.
Keywords: vzgoja in izobraževanje, hipermedija, samoregulacijska ogrodja, samoregulirano učenje, učne strategije, učni dosežki, učenci, devetošolci, scaffolds, hypermedia, self-regulated learning, learning strategies, achievement
Published in DiRROS: 07.07.2025; Views: 433; Downloads: 273
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1767. Structural basis of G-quadruplex recognition by a camelid antibody fragmentMojca Pevec, Tadej Medved, Matic Kovačič, Neža Žerjav, Jernej Imperl, Janez Plavec, Jurij Lah, Remy Loris, San Hadži, 2025, original scientific article Published in DiRROS: 07.07.2025; Views: 413; Downloads: 218
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1768. Srbija na istorijskoj prekretnici 1944: slom monarhista i pobeda komunističkih snagaNemanja Dević, 2024, original scientific article Abstract: Srbija se je sredi leta 1944 znašla na zgodovinski prelomnici. Odločitev zaveznikov, da podprejo komunistično stran, je pripomogla k izidu večletne državljanske vojne in omogočila komunistom prevzem oblasti v državi. Partizanske sile, ki so iz Bosne in Črne gore prodrle v Srbijo, so uspele dotlej prevladujočemu četniškemu gibanju zadati več velikih porazov. Vmes so se krepile tudi lokalne partizanske sile, ki so iz gverilskih odredov po zgledu drugih delov države prerasle v divizije in korpuse NOVJ. Končno jim je septembra 1944 na pomoč priskočila Rdeča armada, ki je pospešila osvoboditev in ključno prispevala k izgonu nemških okupacijskih sil. V prispevku želimo na podlagi obstoječe literature in arhivskih virov podati pregled razmer v Srbiji poleti in jeseni 1944 ter izpostaviti ključne dejavnike, ki so pripeljali do partizanskega prevzema oblasti.
Keywords: Srbija, druga svetovna vojna, leto 1944, četniki, partizani
Published in DiRROS: 06.07.2025; Views: 348; Downloads: 122
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1769. Biorafinerijski potencial manjvrednega lesa rdečega bora (Pinus sylvestris L.) in robinije (Robinia pseudoacacia L.) za pridobivanje naravnih bioaktivnih učinkovin za zaščito lesaViljem Vek, Ida Poljanšek, Urša Osolnik, Peter Hrovatič, Angela Balzano, Miha Humar, Primož Oven, 2025, review article Abstract: S prispevkom želimo predstaviti glavne rezultate in povzetek znanstvenih dognanj, do katerih smo prišli z dvema nacionalnima podoktorskima projektoma ob podpori takratnega Ministrstva za izobraževanje, znanost in šport Republike Slovenije (MIZŠ) ter Javne agencije za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije (ARIS). Analizirali smo biorafinerijski potencial manjvrednega lesa rdečega bora (Pinus sylvestris L.) in robinije (Robinia pseudoacacia L.) za ekstrakcijo naravnih bioaktivnih spojin. Les grč in jedrovine smo uporabili kot biomaso za ekstrakcijo polifenolnih ekstraktivov, ki smo jih nato uporabili v naravno osnovanih pripravkih za zaščito lesa. Rezultati so pokazali, da hidrofilni ekstraktivi grč bora in jedrovine robinije zavirajo glivni razkroj lesa in imajo velik potencial kot biocidne komponente in antioksidanti v naravno osnovanih zaščitnih pripravkih. Nadaljnje raziskave antioksidativnih in protiglivnih lastnosti ekstraktivov lesa in skorje so v teku.
Keywords: robinija, rdeči bor, grče, les, manjvredna drevesna biomasa, ekstrakcija, polifenoli, naravni fungicidi in antioksidanti, biorafinerija, krožno biogospodarstvo
Published in DiRROS: 04.07.2025; Views: 747; Downloads: 293
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1770. Leseni daljnovodni drogovi – analiza vzrokov za prezgodnji razkroj na območju SlovenijeMiha Humar, Boštjan Lesar, Nace Kregar, Simon Drnovšek, 2025, original scientific article Abstract: Študija se osredotoča na analizo vzrokov za prezgodnji propad lesenih daljnovodnih drogov v severovzhodni Sloveniji, kjer je bilo zabeleženih več primerov hitrega glivnega razkroja drogov, kljub načrtovani življenjski dobi 30 do 50 let. Drogovi so bili izdelani iz lesa rdečega bora in impregnirani z baker-etanolaminskim biocidnim proizvodom. Namen raziskave je bil oceniti stanje stoječih drogov in preučiti ključne vzroke za njihovo prezgodnjo degradacijo na primeru dveh podrtih drogov. Uporabljene metode vključujejo uporabo rezistografa za določanje razkrojenosti lesa po preseku, izolacija izvrtkov za določanje penetracije in retencije. Poleg tega je bila opravljena mikroskopska in hiperspektralna analiza na vzorcih lesa za natančno karakterizacijo razkroja. Rezultati so pokazali, da je bila impregnacija lesa večinoma nezadostna, kar je vodilo v razširjen razkroj, zlasti na območjih, kjer je v les prodrlo premalo biocidnega proizvoda oziroma ni bila prepojena celotna beljava borovih drogov. Pospešen propad drogov je posledica delovanja gliv rjave trohnobe. Raziskava poudarja potrebo po izboljšani impregnaciji in rednem nadzoru drogov za zagotavljanje njihove življenjske dobe in s tem povezano zanesljivostjo oskrbe z električno energijo.
Keywords: daljnovodni drogovi, impregnacija, bakrovi biocidni proizvodi, glivni razkroj, rezistograf, penetracija, retencija
Published in DiRROS: 04.07.2025; Views: 763; Downloads: 318
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