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1.
Ferrite-based magnets by high pressure consolidation
Cesár De Julián Fernández, Blaž Belec, Aleksander Učakar, Petra Jenuš, 2023, published scientific conference contribution abstract

Abstract: M-type hexaferrite magnets constitute together the rare-earth magnets the most employed magnets in the world. Even if ferrite magnets have smaller energy product and lower magnetization saturation than rare-earth permanent magnets (PMs), currently ferrite magnets represent the most widely used PMs, covering 80% of the PM market production [1,2]. Recently, a strong effort is being performed to improve the magnetic properties of ferrites with the scope of substituting partially rare-earth magnets. Most of the strategies involve the nanostructuration of the ferrites and/or the development of hybrid compounds [3]. A bottleneck for the production of these magnets is that standard sintering process requires high temperatures and oxidizing atmosphere that produces the destruction of the nanostructure and several chemical changes. Different novel strategies as out-of-equilibrium or cold sintering processes are mainly considered[2,4]. In our presentation we will show the production of dense ferrite-based magnets by high pressure multi-Anvil press at low temperatures. This press applies quasi-isotropic pressures in the range up to 20 GPa and temperatures up to 1200°C. We demonstrate that the consolidation of micrometric hexaferrite (SrFe12O19) powders is possible at temperatures below 1000°C, below the standard sintering temperatures. In addition, dense hybrid magnets were obtained composed of micrometric hexaferrites and soft high magnetization metal Fe or FeCo NPs applying pressures up to 6 GPa and low temperatures (250°C). A deep study, including structural, morphological and magnetic characterizations, has been performed to determine the influence of the temperature and pressure consolidation conditions in the properties of these novel magnets. Magnetic characterizations show that hybrid magnets exhibit larger magnetization than ferrites and single step hysteresis loops. Single Point Detection characterizations indicate that the anisotropy field of the hybrid magnets is similar to that of the ferrite magnets. These results suggest that the two moieties componing the high pressure consolidated magnets have similar properties than the original micro and nano powders, but they are magnetic coupled during the reversal process. High pressure consolidation appears as a promising technique to obtain nano-based metal-oxide hybrid magnets with promising hard properties.
Keywords: ferrite magnets, high pressure consolidation, low temperatures
Published in RUNG: 19.10.2023; Views: 673; Downloads: 5
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2.
Least-square fit : written report
Aleksander Đorđević, 2021, research project (high school)

Keywords: least-square fit, non-linear regression, Levenberg-Marquardt algorithm
Published in RUNG: 28.06.2021; Views: 2130; Downloads: 0
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3.
Jeziki ne izumirajo zaradi lepotnih napak, ampak zaradi neuporabe : 55. študijski dnevi Draga
2020, radio or television broadcast, podcast, interview, press conference

Abstract: Pogovor o 55. študijskih dnevih Draga 2020.
Keywords: slovenski jezik, Italija, uporaba
Published in RUNG: 10.02.2021; Views: 1907; Downloads: 81
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Energetska učinkovitost in inteligentna raba energije na čistilnih napravah : (primer CČN Kranj)
Aleksander Mulec, Drago Papler, Jelka Kopše, Miha Erklavec, 2019, published professional conference contribution

Keywords: čistilne naprave, ekologija, ekonomika, optimizacija
Published in RUNG: 26.05.2020; Views: 2320; Downloads: 0
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7.
Determination of Dissolved Iron Redox Species in Freshwater Sediment using DGT Technique Coupled to BDS
Hanna Budasheva, Aleksander Kravos, Dorota Korte, Arne Bratkič, Yue Gao, Mladen Franko, 2019, original scientific article

Abstract: In this work we have developed a novel method for determination of iron redox species by the use of diffusive gradients in thin-film (DGT) technique coupled to photothermal beam deflection spectroscopy (BDS). The combination of both methods achieved low limit of detection (LOD) of 0.14 μM for Fe (II) ions. The total Fe concentration determined in the Vrtojbica river sediment (Slovenia, Rožna Dolina, 5000 Nova Gorica) was 49.3 μgL–1. The Fe (II) and Fe (III) concentra- tion amounted to 12.8 μgL–1 and 39.9 μgL–1, respectively. Such an approach opens new opportunities for monitoring the content of iron species in natural waters and sediments and provides highly sensitive chemical analysis and an accurate qualitative and quantitative characteristic of the materials under study.
Keywords: Beam deflection spectroscopy, diffusive gradients in thin-film technique, iron redox species, photothermal techniques, sediment
Published in RUNG: 26.02.2019; Views: 3614; Downloads: 114
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Symmetries in nonlinear PDE of slow dense granular flow
Aleksander Grm, 2006, published professional conference contribution abstract

Keywords: nelinearne parabolične enačbe, simetrije, parcialne diferencialne enačbe
Published in RUNG: 15.10.2013; Views: 5100; Downloads: 35
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10.
Marketing izdelkov iz furnirja
Aleksander Boškin, 2006, undergraduate thesis

Abstract: V diplomski nalogi smo celovito preučili marketing izdelkov iz furnirja, opravili smo podrobno tržno raziskavo, kjer smo analizirali obstoječe odjemalce ter anketirali potencialne odjemalce. Najprej smo na podlagi pridobljenega znanja in teoretičnih osnov predstavili pojma raziskava trga ter razvoj in uvajanje novega izdelka na trg. V nadaljevanju naloge smo predstavili izdelke, ki so predmet raziskave, načrtovali in izvedli natančno raziskavo trga za omenjene izdelke in opredelili položaj obravnavane organizacije na slovenskem trgu. V naslednjem poglavju smo obravnavali koncept segmentiranja in pozicioniranja izdelkov z opisom marketinškega spleta. Posebno pozornost smo namenili določanju možnih odjemalcev za nov izdelek, ter določanju ciljnih skupin za katere smo analizirali njihove značilnosti in potrebe. Z izsledki naloge z uporabo pravilno načrtovane politike in izbrane marketinške strategije bomo pripomogli k boljši prodaji izdelkov iz furnirja.
Keywords: diplomske naloge, marketing, tržne raziskave, izdelki, furnir
Published in RUNG: 15.10.2013; Views: 5801; Downloads: 445
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