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64. High-temperature stabilization of bulk amorphous Al2O3Andraž Mavrič, Mattia Fanetti, Gregor Mali, Matjaž Valant, 2018, original scientific article Abstract: We present a method for high temperature stabilization of bulk amorphous aluminium oxide. The stabilization is achieved by dispersing polysilane dendritic molecules in aluminium hydroxide gel, which upon thermal treatment gives amorphous aluminium oxide stable up to 900 °C. The dispersed macromolecules covalently bind to the alumina matrix and induce homogeneously distributed strain fields that keep the alumina amorphous. The thermal conversion of the precursor system was followed by thermogravimetry with an evolved gas analysis, infrared spectroscopy and 29Si NMR. The amorphous structure of aluminium oxide was confirmed with an X-ray and electron diffraction. Additionally, the amorphous state was supported by presence of penta-coordinated aluminium detected by 27Al NMR and a low bandgap measured by a UV–visible absorption spectroscopy.
Keywords: Amorphous aluminium oxide, Polysilane, Nanocomposite, Stabilization
Published in RUNG: 30.07.2018; Views: 6262; Downloads: 25
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65. Primjena pivskog tropa u proizvodnji bioplinaMario Panjicko, Gregor Drago Zupančič, Marina Tišma, Bruno Zelić, 2017, independent scientific component part or a chapter in a monograph Abstract: Pivarska industrija je veliki generator otpadnih tokova. Pivski trop, kao jedan od tri glavna otpada toka, po kemijskom je sastavu lignocelulozni materijal. Zbog sve većeg porasta cijena energije i povećane brige za očuvanjem okoliša, u zadnje vrijeme se provode brojna istraživanja procesa anaerobne razgradnje (anaerobne digestije) pivskog tropa u svrhu proizvodnje bioplina.
Bioplin proizveden prilikom procesa anaerobne razgradnje sastoji se najvećim dijelom od metana (CH4) i ugljikovog dioksida (CO2), s malim udjelima sumporovodika (H2S) i amonijaka (NH3) te plinova koji se mogu naći u tragovima, kao što su vodik (H2), dušik (N2), ugljikov monoksid (CO), zasićeni ili halogenirani ugljikovodici te kisik (O2).
Osnovni problem primjene pivskog tropa u procesu anaerobne razgradnje u svrhu proizvodnje bioplina je njegov složen kemijski sastav. Strukturna kompleksnost lignina, njegova kemijska stabilnost i netopljivost posebice otežavaju proces anaerobne razgradnje.
U ovom pregledu prikazane su osnove procesa anaerobne razgradnje, vrste reaktora za provedbu procesa anaerobne razgradnje te su opisane mogućnosti primjene pivskog tropa u procesu anaerobne razgradnje.
Keywords: anaerobna razgradnja, bioreaktori, lignoceluloza, bioplin, pivski trop
Published in RUNG: 23.04.2018; Views: 6587; Downloads: 0
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66. À MON SEUL DÉSIR : Muzejski torkov večerNarvika Bovcon, Aleš Vaupotič, Vanja Mervič, Katja Mihurko, Gregor Jug, other performed works Abstract: Muzejski torkov večer na Gradu Kromberk, 28. novembra 2017 ob 19. uri.
Predstavitev knjige umetnika in razstava À MON SEUL DÉSIR.
V okviru dogodka bodo potekali:
razstava knjige umetnika s povečanimi stranmi (v aplikaciji Layar),
3D vizualizacije zgodovine literarnih avtoric (skuplture in grafika),
predavanje Katje Mihurko Poniž o projektu “Potujoči teksti”, ki je podlaga za umetniški intervenciji,
degustacija hrane, ki je narejena po receptih literarnih avtoric (Gregor Jug iz domačije Lisjak, Zalošče).
Sodelujejo: Narvika Bovcon, Vanja Mervič, Aleš Vaupotič in prof. Katja Mihurko Poniž.
Keywords: À MON SEUL DÉSIR, predavanje, predstavitev knjige umetnika, literarne avtorice, umetnikova predstavitev, kulinarični dogodek
Published in RUNG: 05.03.2018; Views: 4723; Downloads: 0
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68. Corn silage fungal-based solid-state pretreatment for enhanced biogas production in anaerobic co-digestion with cow manureMarina Tišma, Mirela Planinc, Ana Bucić Kojić, Mario Panjičko, Gregor Drago Zupančič, Bruno Zelić, 2018, original scientific article Abstract: The objective of this research was to use white-rot fungus Trametes versicolor for corn silage pretreatment and to investigate the effect of pretreatment on biogas productivity. Semi-continuous pilot-scale experiment, comprised of two experimental phases, was carried out. In the first phase, operational conditions of the full-scale biogas plant were reproduced at pilot-scale. In that phase, the reactor was daily fed with the mixture of cow manure,
digestate from industrial postfermentor, corn grits and ensiled corn silage, and the average methane generation
rate was 0.167 m3 CH4 per kgVS. In the second phase, corn grits and ensiled corn silage were replaced with corn
silage pretreated with T. versicolor, and the average methane generation rate increased up to 0.236 m3 per CH4 kgVS. The results of this study suggest that application of fungal-based solid-state pretreated corn silage has positive
effect on pH stability and increase the biogas productivity.
Keywords: Semi-continuous anaerobic co-digestion
Fungal-based pretreatment
Corn silage
Cow manure
Published in RUNG: 17.01.2018; Views: 5088; Downloads: 0
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69. A Mechanistic Study of Magnesium Sulfur BatteriesAna Robba, Alen Vižintin, Jan Bitenc, Gregor Mali, Iztok Arčon, Matjaž Kavčič, Matjaž Žitnik, Klemen Bučar, Giuliana Aquilanti, Charlotte Martineau-Corcos, Anna Randon-Vitanova, Robert Dominko, 2017, original scientific article Abstract: Magnesium sulfur batteries are considered as attractive energy storage devices due to the
abundance of electrochemically active materials and high theoretical energy density. Here we
report the mechanism of a Mg-S battery operation, which was studied in the presence of
simple and commercially available salts dissolved in a mixture of glymes. The electrolyte
offers high sulfur conversion into MgS in the first discharge with low polarization. The
electrochemical conversion of sulfur with magnesium proceeds through two well-defined
plateaus, which correspond to the equilibrium between sulfur and polysulfides (high-voltage
plateau) and polysulfides and MgS (low-voltage plateau). As shown by XANES, RIXS and
NMR studies, the end discharge phase involves MgS with Mg atoms in a tetrahedral
environment resembling the wurtzite structure, while chemically synthesized MgS crystalizes
in the rock-salt structure with octahedral coordination of magnesium.
Keywords: magnesium, sulfur, rechargeable batteries, XAS, NMR
Published in RUNG: 19.10.2017; Views: 5711; Downloads: 0
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