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* old and bolonia study programme


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Strong events in the sand-pile model
Alexander Shapoval, M. Shnirman, 2004, original scientific article

Abstract: Here is a sand-pile introduced by Bak et al. The system accumulates particles one by one. From time to time it topples. Every toppling initiates an event. The distribution of the events' size follows a power law for all the events except the strongest ones. The fraction of the strongest events does not depend on the system length. The number of particles and their clustering increase before the strongest events.
Found in: ključnih besedah
Summary of found: ...distribution of the events' size follows a power law for all the events except the...
Keywords: sandpile, prediction, power-law
Published: 19.04.2021; Views: 1028; Downloads: 0
.pdf Fulltext (180,33 KB)

The BTW mechanism on a self-similar image of a square
Alexander Shapoval, M. Shnirman, 2012, original scientific article

Found in: ključnih besedah
Summary of found: ...sandpile, power-law probability distribution, universality class...
Keywords: sandpile, power-law probability distribution, universality class
Published: 19.04.2021; Views: 1077; Downloads: 0
.pdf Fulltext (414,17 KB)

Crossover phenomenon and universality: from random walk to deterministic sand-piles through random sand-piles
Alexander Shapoval, M. Shnirman, 2005, original scientific article

Found in: ključnih besedah
Summary of found: ...sandpile, universality class, power-law exponent...
Keywords: sandpile, universality class, power-law exponent
Published: 19.04.2021; Views: 1219; Downloads: 0
.pdf Fulltext (378,24 KB)

Sand density as sandpile descriptor
Alexander Shapoval, M. Shnirman, 2008, original scientific article

Found in: ključnih besedah
Summary of found: ...sandpile, critical density, power law exponent...
Keywords: sandpile, critical density, power law exponent
Published: 19.04.2021; Views: 1244; Downloads: 0
.pdf Fulltext (431,08 KB)

Links between HX-groups and hypergroups
Babatunde Oluwaseun Onasanya, Irina Elena Cristea, Michal Novak, 2021, original scientific article

Found in: ključnih besedah
Summary of found: ...HX-group, hyperstructure theory, Chinese hypergroupoid, EL-hyperstructure, power sets...
Keywords: HX-group, hyperstructure theory, Chinese hypergroupoid, EL-hyperstructure, power sets
Published: 03.06.2021; Views: 1163; Downloads: 0
.pdf Fulltext (321,00 KB)

1/x distribution in a close proximity of the Bak-Tang-Wiesenfeld sandpile
Alexander Shapoval, other performed works

Found in: ključnih besedah
Keywords: sandpile, scale-free distribution, power-law
Published: 09.07.2021; Views: 1130; Downloads: 0
.pdf Fulltext (3,85 MB)

Monitoring the success of the performance of a travel agency with the Power BI tool
Riste Ristov, 2022, undergraduate thesis

Abstract: In today’s times, when digitalisation is advancing in all areas, travel agencies need to follow trends to optimise their work as much as possible and stay competitive. Business information systems provide a more detailed insight into business processes and their operation, which helps monitor progress and adapt to possible changes to achieve the best results in the business world. Travel agencies need a quality business information system that helps employees shift from using basic office tools to more modern and effective systems for reporting and monitoring work performance. Data is the basis on which agencies adjust, optimise and build their business. Data is available in huge quantities and a variety of formats. Raw data that is not organised into a meaningful whole cannot bring added value to the company. The thesis aims to use Power BI as a tool for editing and integrating databases in travel agencies, as well as their visualisation and display, which is understandable for the user. With the help of the tool, we will create a report which will help the travel agency improve its business and make critical decisions that are critical for success.
Found in: ključnih besedah
Keywords: Travel agency, business information system, data, database, Power BI, visualisation
Published: 30.09.2022; Views: 430; Downloads: 37
.pdf Fulltext (1,26 MB)
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Correlation between FeCl2 electrolyte conductivity and electrolysis efficiency
Luin Uroš, Valant Matjaz, Arčon Iztok, 2022, published scientific conference contribution abstract

Abstract: The electrolysis efficiency is an important aspect of the Power-to-Solid energy storage technology (EST) based on the iron chloride electrochemical cycle [1]. This cycle employs an aqueous FeCl2 catholyte solution for the electro-reduction of iron. The metal iron deposits on the cathode. The energy is stored as a difference in the redox potential of iron species. Hydrogen, as an energy carrier, is released on demand over a fully controlled hydrogen evolution reaction between metallic Fe0 and HCl (aq) [1]. Due to these characteristics, the cycle is suitable for long-term high-capacity and high-power energy storage. In a previous work [2] we revealed that the electrolyte conductivity linearly increases with temperature. Contrary, the correlation between the electrolyte concentration and efficiency is not so straightforward. Unexpectedly small efficiency variations were found between 1 and 2.5 mol dm-3 FeCl2 (aq) followed by an abrupt efficiency drop at higher concentrations. To explain the behavior of the observed trends and elucidate the role of FeCl2 (aq) complex ionic species we performed in situ X-ray absorption studies. We made a dedicated experimental setup, consisting of a tubular oven and PMMA liquid absorption cell, and performed the measurements at the DESY synchrotron P65 beamline. The XAS investigation covered XANES and EXAFS analyses of FeCl2 (aq) at different concentrations (1 - 4 molL-1) and temperatures (25 - 80 °C). We found that at low temperature and low FeCl2 concentration the octahedral first coordination sphere around Fe is occupied by one Cl ion at a distance of 2.33 (±0.02) Å and five water molecules at a distance of 2.095 (±0.005) Å [3]. The structure of the ionic complex gradually changes with an increase in temperature and/or concentration. The apical water molecule is substituted by a chlorine ion to yield a neutral Fe[Cl2(H2O)4]0. The transition from the single charged Fe[Cl(H2O)5]+ to the neutral Fe[Cl2(H2O)4]0 causes a significant drop in the solution conductivity, which well correlates with the existing conductivity models [3]. [1] M. Valant, “Procedure for electric energy storage in solid matter. United States Patent and Trademark Office. Patent No. US20200308715,” Patent No. US20200308715, 2021. [2] U. Luin and M. Valant, “Electrolysis energy efficiency of highly concentrated FeCl2 solutions for power-to-solid energy storage technology,” J. Solid State Electrochem., vol. 26, no. 4, pp. 929–938, Apr. 2022, doi: 10.1007/S10008-022-05132-Y. [3] U. Luin, I. Arčon, and M. Valant, “Structure and Population of Complex Ionic Species in FeCl2 Aqueous Solution by X-ray Absorption Spectroscopy,” Molecules, vol. 27, no. 3, 2022, doi: 10.3390/molecules27030642.
Found in: ključnih besedah
Summary of found: ...efficiency is an important aspect of the Power-to-Solid energy storage technology (EST) based on the iron...
Keywords: Iron chloride electrochemical cycle, Power-to-Solid energy storage, XANES, EXAFS, electrical conductivity, electrolyte complex ionic species structure and population
Published: 26.09.2022; Views: 364; Downloads: 0
.pdf Fulltext (27,64 MB)

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