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The Influence of Increased Moderator Temperature on the Nuclear Characteristics of the NPP Krško
Marjan Kromar, Bojan Kurinčič, 2019, objavljeni znanstveni prispevek na konferenci

Opis: NPP Krško safety analysis has been performed in such a way to allow operation with primary system average coolant temperature - Tavg inside a prescribed range, which constitute the socalled operating window. The Tavg window enables certain flexibility to select an optimum value within the Tavg range taking into account safety, operational and economical considerations. Increase of the reactor coolant temperature in general improves thermodynamic efficiency of the Pressurized Water Reactor (PWR) plant yielding to increase in the electricity production. However, higher temperature causes lower water density in the reactor core altering the neutron moderation and consequently neutron transport in the reactor. This impact on the nuclear core characteristics is investigated for the NPP Krško reactor core.
Ključne besede: pressurized water reactor, nuclear design calculations, reactor coolant temperature optimization, critical boron concentration, Nuclear Powe Plant Krško
Objavljeno v DKUM: 05.12.2023; Ogledov: 216; Prenosov: 12
.pdf Celotno besedilo (18,06 MB)
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Use of active elements for providing suitable voltage profiles and prevent overloads in radial distribution networks
Marko Vodenik, Matej Pintarič, Gorazd Štumberger, 2022, izvirni znanstveni članek

Opis: The article deals with the issue of providing suitable voltage profiles and preventing congestion of network elements in distribution networks. Active network elements and network users’ energy flexibility services are used to provide a suitable voltage profile and prevent congestion in distribution networks. The discussed active network elements include a transformer with on-load tap changer, reactive power compensation devices, energy storage systems, distributed energy resources, and network users’ energy flexibility services, where the active consumers adjust their consumption, production and storage of energy. Based on the Backward Forward Sweep load flow computation method, the case studies are performed for the discussed low voltage distribution network, where the measurement results were available. The case studies for preventing overload of the distribution transformer are performed using a battery energy storage system and network users’ energy flexibility services. The case studies for providing suitable voltage profiles are performed using all listed active elements and a combination of different active elements. In addition, to provide suitable voltage profiles, the existing conductors are replaced with conductors of a larger cross-section. Technically acceptable solutions that can provide a suitable voltage profile and prevent the overloading of network elements in the most demanding operating conditions are presented in this article.
Ključne besede: voltage profile, radial distribution network, load flow calculations, active network elements, energy flexibility
Objavljeno v DKUM: 30.10.2023; Ogledov: 397; Prenosov: 4
.pdf Celotno besedilo (5,24 MB)
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Ensemble Docking Coupled to Linear Interaction Energy Calculations for Identification of Coronavirus Main Protease (3CLpro) Non-Covalent Small-Molecule Inhibitors
Marko Jukič, Dušanka Janežič, Urban Bren, 2020, izvirni znanstveni članek

Opis: SARS-CoV-2, or severe acute respiratory syndrome coronavirus 2, represents a new strain of Coronaviridae. In the closing 2019 to early 2020 months, the virus caused a global pandemic of COVID-19 disease. We performed a virtual screening study in order to identify potential inhibitors of the SARS-CoV-2 main viral protease (3CLpro or Mpro). For this purpose, we developed a novel approach using ensemble docking high-throughput virtual screening directly coupled with subsequent Linear Interaction Energy (LIE) calculations to maximize the conformational space sampling and to assess the binding affinity of identified inhibitors. A large database of small commercial compounds was prepared, and top-scoring hits were identified with two compounds singled out, namely 1-[(R)-2-(1,3-benzimidazol-2-yl)-1-pyrrolidinyl]-2-(4-methyl-1,4-diazepan-1-yl)-1-ethanone and [({(S)-1-[(1H-indol-2-yl)methyl]-3-pyrrolidinyl}methyl)amino](5-methyl-2H-pyrazol-3-yl)formaldehyde. Moreover, we obtained a favorable binding free energy of the identified compounds, and using contact analysis we confirmed their stable binding modes in the 3CLpro active site. These compounds will facilitate further 3CLpro inhibitor design.
Ključne besede: COVID-19, SARS-CoV-2, Mpro, 3CLpro, 3C-like protease, virtual screening, inhibitors, in silico drug design, free-energy calculations
Objavljeno v DKUM: 10.12.2020; Ogledov: 1108; Prenosov: 174
.pdf Celotno besedilo (2,99 MB)

Solution of the problem of critical path’s finding in Excel on the basis of reducing it to ordinary transportation task
Mimo Drašković, Ludmila Malyaretz, Oleksandr Dorokhov, 2016, samostojni znanstveni sestavek ali poglavje v monografski publikaciji

Opis: The problem of determining the critical path for the scheduling tasks has been considered. An original technique for practical calculations using the available Solver add-on in Excel has been described. The proposed approach is based on reducing the task to solving the ordinary transportation problem, in particular to the problem of finding the longest path. Examples of solutions with the test input data and corresponding screenshots are given. The practical steps of the user’s action in the process of direct solution in Excel are consistently described. The analysis of the results of the proposed method has been performed and presented. It is established that presented method for calculating the critical path requires minimal efforts from the users, regardless of the dimension of the tasks.
Ključne besede: task scheduling, transportation tasks, calculations, critical path, Excel, Solver, software tools
Objavljeno v DKUM: 09.05.2018; Ogledov: 1036; Prenosov: 84
.pdf Celotno besedilo (377,09 KB)
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Testing the sustainability of growth of the LJSEX in the January 2000 to May 2010 period
Aleš Ahčan, 2011, izvirni znanstveni članek

Opis: In this paper we analyse the behaviour of the LJSEX, the main index of the Ljubljana Stock Exchange, in the period from January 2000 till May 2010. More precisely, we test for the presence of bubbles and antibubbles and try to determine whether or not a bubble could have been predicted (both the formation and the date of the bubble burst). Second, we also employ techniques used to model antibubbles to forecast the future behaviour of the LJSE index. Besides modelling index dynamics for the aforementioned period, we also seek to determine the factors that led to the bubble forming and later bursting. We find that the bubble could have been forecasted at least several months in advance. On the other hand, a very precise date of the crash seems harder to identify. By more closely analysing the interplay between interest rates, credit activity and the LJSEX, we conclude that there is a clear connection between decreasing interest rates, increased credit activity and the formation of a stock bubble. If there is a clear correlation between the early phase of a bubble and increased credit activity of the banking sector, the link between the end of the bubble and the restriction of credit activity is less pronounced. By fitting the extended antibubble model from (Johansen 1999a) we obtain the values of parameters that give us some indication of the future behaviour of the LJSEX. Based on these results we conclude that in the next few years we are likely to experience a period of increased volatility with no clear increasing or decreasing growth pattern.
Ključne besede: exchange, interest rate, business mathematics, calculations, models
Objavljeno v DKUM: 22.01.2018; Ogledov: 1125; Prenosov: 350
.pdf Celotno besedilo (698,29 KB)
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