1. Izgradnja priključnega SN kablovoda med TP Bele Vode Štakne, tč. 249 in TP Smrekovec (nadomestna) : diplomsko deloZoran Oblak, 2025, undergraduate thesis Abstract: V današnjem času je javnost prepričana, da je električna energija nekaj samoumevnega, vendar pa je realnost povsem drugačna. Pri opravljanju svojega dela pri podjetju Elektro Celje d.d. smo ob nepredvidenih izpadih in izklopih ob vzdrževanju deležni kritik odjemalcev električne energije. Zato tudi odločitev, da se deli srednjenapetostnega daljnovoda, ki pretežno poteka po gozdni površini, pokablira.
Naloga obravnava rekonstrukcijo srednjenapetostnega omrežja med TP Bele Vode Štakne, tč. 249 in TP Smrekovec (nadomestna). Projekt zajema vključevanje nove nadomestne transformatorske postaje s pripadajočim nizkonapetostnim omrežjem in rekonstrukcijo dotrajanega prostozračnega srednjenapetostnega omrežja. Rekonstrukcija je bila izvedena s kabliranjem. V projektu je zajeta izvedba del, uporaba potrebnega materiala in predviden finančni okvir rekonstrukcije srednjenapetostnega omrežja ter vključitev nove nadomestne transformatorske postaje. Cilj diplomske naloge je predstavitev rekonstrukcije dela srednjenapetostnega omrežja DV Lokovica med TP Bele vode Štakne, tč. 249 in TP Smrekovec(nadomestna), ki se napaja iz RTP Velenje.
Keywords: srednje napetostno omrežje, rekonstrukcija, podzemno omrežje, elementi srednje napetostnega omrežja.
Published in DKUM: 09.05.2025; Views: 0; Downloads: 4
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2. In-plane deformation behavior and the open area of rotating squares in an auxetic compound fabricPolona Dobnik-Dubrovski, Nejc Novak, Matej Borovinšek, Matej Vesenjak, Zoran Ren, 2022, original scientific article Abstract: A conventional compound fabric was used to develop a modern, multifunctional material
with an auxetic behaviour and a tailored open area for particle filtration. Such material was produced
using traditional textile technology and laser cutting, to induce a rotating squares unit geometry. The
behaviour was investigated of three different rotating unit cell sizes. The laser slit thickness and the
length of the hinges were equal for all three-unit cells. The tensile properties, Poisson’s ratio and
auxetic behaviour of the tested samples were investigated, especially the influence of longitudinal
displacement on the fabric’s open area and the filtered particle sizes (average and maximum). Results
show that the developed compound fabric possesses an average negative Poisson’s ratio of up to
−1, depending on the applied auxetic geometry. The larger rotating cell size samples offer a higher
average negative Poisson’s ratio and a higher breaking strength due to the induced slits. The findings
highlight the usefulness of patterned cuts in conventional textile materials to develop advanced
auxetic textile materials with tailored geometrical and mechanical properties.
Keywords: compound textile material, auxetic structure, open area, filtration, mechanical properties, Poisson’s ratio
Published in DKUM: 25.03.2025; Views: 0; Downloads: 3
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3. Mechanism elucidation of high-pressure generation in cellular metal at high-velocity impactMasatoshi Nishi, Shigeru Tanaka, Akihisa Mori, Matej Vesenjak, Zoran Ren, Kazuyuki Hokamoto, 2022, original scientific article Abstract: Cellular metals exhibit diverse properties, depending on their geometries and base materials. This study investigated the mechanism of high-pressure generation during the high-velocity
impact of unidirectional cellular (UniPore) materials. Cubic UniPore copper samples were mounted
on a projectile and subjected to impact loading using a powder gun to induce direct impact of samples.
The specimens exhibited a unique phenomenon of high-pressure generation near the pores during
compression. We elucidate the mechanism of the high-pressure phenomenon and discuss the pore
geometries that contribute to the generation of high pressures.
Keywords: cellular metal, high-pressure, high-velocity impact, computational simulation, metal jet
Published in DKUM: 24.03.2025; Views: 0; Downloads: 2
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5. Enhancing the properties and morphology of starch aerogels with nanocelluloseMilica Pantić, Mariusz Nowak, Gregor Lavrič, Željko Knez, Zoran Novak, Irena T. Žižović, 2024, original scientific article Keywords: starch aerogels, cellulose, supercritical impregnation, xanthohumol, usnic acid
Published in DKUM: 15.01.2025; Views: 0; Downloads: 4
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6. Urgentni kardiovaskularni zapleti po cepljenju proti COVIDU-19Aljaž Malec, 2024, master's thesis Abstract: Uvod: Ob množični uporabi cepiv proti COVIDU-19 se je izkazalo, da se pri nekaterih cepljenjih pojavljajo tudi nevarni kardiovaskularni neželeni učinki. S pomočjo pregleda literature smo želeli raziskati urgentne kardiovaskularne zaplete po cepljenju proti COVIDU-19.
Metode: Izvedli smo pregled, analizo ter sintezo literature, pridobljene v mednarodnih podatkovnih bazah PubMed, MEDLINE, SAGE in Web of Science. Vključili smo polno dostopne znanstvene pregledne članke v slovenskem in angleškem jeziku, brez časovne omejitve, ki so vključevale ljudi. S pomočjo PRISMA diagrama smo prikazali potek pregleda. Vključene raziskave smo prikazali v evalvacijski tabeli, jih kritično ovrednotili s pomočjo evalvacijskega orodja JBI ter izvedli opisno sintezo.
Rezultati: V analizo smo vključili 21 raziskav, 8 sistematičnih pregledov in 13 narativnih pregledov. Medtem ko ima večina cepljenih posameznikov ničelne ali blage neželene učinke, obstajajo dokazi, ki kažejo, da lahko majhno skupino cepljenih posameznikov prizadenejo pomembni urgentni kardiovaskularni zapleti.
Diskusija in zaključek: Naš pregled omogoča vpogled v povezavo med cepljenjem proti COVIDU-19 in pojavnostjo urgentnih kardiovaskularnih zapletov, vendar ima določene omejitve. Velik del pregledane literature sestavljajo narativni in nesistematični pregledi, ki so informativni, a lahko vsebujejo subjektivnost in pomanjkanje stroge metodologije. To je vplivalo na celovitost in uravnoteženost naših ugotovitev, saj bi sistematični pregledi in metaanalize zagotovili močnejše in objektivnejše dokaze o varnosti in neželenih učinkih cepiva proti COVIDU-19.
Keywords: cepljenje, COVID-19, urgentni kardiovaskularni zapleti, cepiva proti COVIDU-19
Published in DKUM: 11.12.2024; Views: 0; Downloads: 48
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7. Development of novel hybrid TPMS cellular lattices and their mechanical characterisationNejc Novak, Oraib Al-Ketan, Matej Borovinšek, Lovre Krstulović-Opara, Reza Rowshan, Matej Vesenjak, Zoran Ren, 2021, original scientific article Abstract: Uniform lattices composed of one type of lattice structure repeated periodically have been extensively investigated in literature for their mechanical and physical properties. Their promising properties, which include a desirable combination of high strength, stiffness and toughness, suggest that hybrid structures made of two or more lattice types can exhibit even more advantageous and desired properties. In this work, the mechanical properties of hybrid cellular structures designed using implicit functions are investigated both experimentally and numerically. Two proposed samples are investigated comprised of a Gyroid and a Diamond unit cells hybridised linearly and radially. First, a finite element computational model was utilised in LS-DYNA to capture the mechanical properties of the additively manufactured constituent lattices (i.e., Gyroid and Diamond) made of stainless steel 316L and tested under dynamic and quasi-static loading conditions. The model was validated for three different relative densities. Then, the validated computational model was then tested to predict the mechanical behaviour of the proposed hybrid lattices. Finally, the proposed hybrid lattices were fabricated and mechanically tested to obtain their mechanical properties. A good agreement between experimental and computational results was achieved. The validated computational models will be used to evaluate other designs of TPMS lattices and their crashworthiness performance for protective equipment applications.
Keywords: cellular materials, triply periodical minimal surface, hybrid lattices, experimental testing, computational modelling, multi-morphology
Published in DKUM: 27.11.2024; Views: 3; Downloads: 11
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9. 10. Nacionalna konferenca o varnosti v lokalnih skupnostih : Mirna, varna in inkluzivna družba ter varnost v lokalnih skupnostih2024, proceedings of peer-reviewed scientific conference contributions (domestic conferences) Abstract: Zbornik prispevkov predstavlja recenzirane prispevke, ki so bili predstavljeni na 10. Nacionalni konferenci o varnosti v lokalnih skupnostih v Kočevju v novembru 2024. Glavna tema konference je varnost v lokalnih skupnostih, poudarek letošnje konference pa je na mirni, varni in inkluzivni družbi. Prispevki so rezultat raziskovanja v okviru programske skupine Fakultete za varnostne vede Univerze v Mariboru »Varnost v lokalnih skupnostih – primerjava ruralnih in urbanih okolij« in sodelovanja s praktiki iz policije in lokalnih skupnosti. Prispevki se osredotočajo na različne vidike zagotavljanja varnosti in zaznave groženj v lokalnih skupnostih, reševanje težav v multikulturnih skupnostih, značilnosti kriminalitete in preventivne ukrepe, preprečevanje mladoletniškega prestopništva, stališča do kaznovanja, kibernetsko varnost in trajnostni razvoj. Prispevki pa hkrati predstavljajo tudi primere dobrih praks.
Keywords: varnost, inkluzivnost, lokalne skupnosti, Slovenija, konferenca
Published in DKUM: 22.11.2024; Views: 0; Downloads: 27
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10. Behaviour of cellular metamaterials under impact loading conditions : doctoral disertationYunus Emre Yilmaz, 2024, doctoral dissertation Abstract: This doctoral thesis investigates cell-size-graded metallic and non-metallic Triply Periodic
Minimal Surface (TPMS) structures' behavior under varying loading rates. Using experimental
tests, analytical calculations, and advanced computer simulations, the research explores the
interplay between material properties, cell size grading, and deformation mechanisms under
different strain rates. The study focuses on enhancing the Direct Impact Hopkinson Bar (DIHB)
setup for accurate force and displacement measurements and pioneering a method for
quantifying inertial forces, critical at high strain rates.
Key findings show that cell-size grading significantly affects deformation patterns, with initial
deformation occurring in regions with smaller and lower stiffness cells across different loading
rates and TPMS geometries. The research also highlights topology's influence on mechanical
response, with photopolymer-based diamond structures showing superior energy absorption
and gas-atomized steel structures favoring gyroid configurations. This underscores the
importance of considering both topology and base material selection during TPMS design. The
study demonstrates the increasing prominence of inertial forces as deformation rates rise,
impacting structural response and failure likelihood in TPMS structures.
These insights inform the design of optimized cellular metamaterials for high-performance
applications requiring superior energy absorption and structural integrity under high loading
rates. The research advances material characterization techniques and computational
modelling capabilities, contributing to the development of next-generation cellular
metamaterials for broader engineering applications.
Keywords: Triply Periodic Minimal Surfaces, TPMS, Cell-size-grading, Impact, High-strainrate, Digital Image Correlation
Published in DKUM: 17.10.2024; Views: 0; Downloads: 32
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