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Food Waste to Energy through Innovative Coupling of CHP and Heat Pump
Jan Drofenik, Danijela Urbancl, Darko Goričanec, Zdravko Kravanja, Zorka Novak-Pintarič, 2023, izvirni znanstveni članek

Opis: This paper presents the conceptual design of a technological solution for the efficient conversion of food waste into heat and power. The distribution and composition of food loss and waste at different stages of the food supply chain in Slovenia and their potential for biogas production were determined. It was found that more than 50% of food waste comes from households. Therefore, a small plant was designed to convert food waste into biogas, which was innovatively coupled with a combined heat and power (CHP) unit and a heat pump. This doubles the amount of heat generated compared to conventional cogeneration. Based on the capacity of a micro commercial CHP unit, 3330 households (about 8000 residents) would supply food waste. The heat generated could replace 5% of the natural gas used for domestic water heating. The payback period would be 7.2 years at a heat price of about 80 EUR/MWh, however, for municipalities with more than 40,000 inhabitants the payback period would be reduced to less than 3 years. The cost price of the heat generated by this system would be about 25 EUR/MWh, taking into account the government subsidy for the operation of the CHP unit.
Ključne besede: food waste to energy, biogas, combined heat and power, CHP, heat pump, efficiency, conceptual design, preliminary economic assessment, sensitivity analysis
Objavljeno v DKUM: 16.02.2024; Ogledov: 49; Prenosov: 0
.pdf Celotno besedilo (19,44 MB)
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Designing a safe and inclusive housing environment for older adults : assessment of nursing home preparedness for post-COVID era
Vesna Žegarac Leskovar, Vanja Skalicky Klemenčič, 2023, izvirni znanstveni članek

Opis: The main objective of the study is to verify whether architectural design elements afect mental and physical health from the perspective of nursing homes’ preparedness to face unpredictable situations, such as the COVID-19 pandemic, which gave rise to the need of rethinking the design of nursing homes to provide quality living environments that enable older adults to live healthy, safe, and socially inclusive lives. During the COVID-19 pandemic, nursing homes were among the most critical types of housing. Various safety measures were taken to protect the physical health of residents, which, at the same time, had a negative impact on their mental health, mainly due to isolation and social distancing. The current study was carried out using both quantitative and qualitative research methods. A literature review, a detailed analysis of selected nursing homes, an online survey of nursing home managers, and on-site work served as the basis for the development of the comprehensive design quality assessment tool “Safe and Connected”, which was further tested on four selected case studies. The cases were selected on the basis of seven independent variables, i.e. nursing home capacity, residential density, foor area, the year of construction and typology, purpose-built construction regarding use and location, and one dependent variable, i.e. nursing home infection rate. The assessment results of the SC tool were verifed against two additional analyses: infection rate data and a resident quality of life survey. The results show the coincidence of the “Safe and Connected” design quality marks and rates of infected residents and quality of life survey results for the observed nursing homes. It can be concluded that the design of the residential environment is identifed as one of the possible factors infuencing the quality of life in nursing homes. Furthermore, understanding the architectural design elements involved in the perception of risks for, and well-being of, residents may be helpful for decision makers, managers, architects, and investors to make sensible decisions when planning and maintaining nursing home facilities in the post-COVID era.
Ključne besede: architectural design, quality of life, older adults, nursing homes, post-COVID era, thermal comfort
Objavljeno v DKUM: 26.01.2024; Ogledov: 64; Prenosov: 4
.pdf Celotno besedilo (1,85 MB)

Tourism experience in accessible tourism : designing a mobile application for the deaf and hard of hearing
Tjaša Alegro, Marica Ilić, Milica Rančić Demir, 2022, samostojni znanstveni sestavek ali poglavje v monografski publikaciji

Opis: How someone experiences a tourist experience depends on several factors. This article will focus on ways to ensure active participation and thus a pleasant and memorable experience for people with disabilities, specifically people with hearing problems – the deaf and hard of hearing. With the development of ICT technology, the possibilities for developing tourist products intended for the deaf and hard of hearing are even greater and can be friendlier to them. Various mobile applications complement a city’s tourist products and services and are more than a welcome help for people with special needs. With an innovative Design Thinking method suitable for planning projects or designing services or products intended for end users, we designed an idea for a mobile application for Ljubljana that is tailored to deaf and hard of hearing tourists, as Slovenia does not yet have a similar application. We designed the product idea based on an overview of good practices. Through five phases of the Design Thinking method, we analysed the indispensable elements of the mobile application for deaf and hard of hearing tourists and evaluated it through the HEART framework matrix developed for user experience assessment.
Ključne besede: experience, measuresaccessible tourism, deaf, hard of hearing, Design Thinking
Objavljeno v DKUM: 17.01.2024; Ogledov: 60; Prenosov: 7
.pdf Celotno besedilo (19,75 MB)
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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: 165; Prenosov: 7
.pdf Celotno besedilo (18,06 MB)
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Towards a Catalogue of Self-Sovereign Identity Design Patterns
Špela Čučko, Vid Keršič, Muhamed Turkanović, 2023, izvirni znanstveni članek

Opis: Self-sovereign identity (SSI) is a user-centric, decentralised identity approach that provides a means for identification, authentication, and authorisation without the involvement of external entities, responsible for identity provisioning and management in current centralised and federated approaches. In general, the basic building blocks of an SSI system include decentralised identifiers, verifiable credentials, identity wallets, a verifiable data registry, and three main actors: issuer, identity holder, and verifier. Even though the SSI field is dominated by proposals, SSI systems can be implemented in different ways, which is reflected in the absence of a well-defined architecture. Thus, the best implementation is still a matter of research, the requirements of the individual system, and its field of application. However, well-designed and implemented systems are crucial to avoiding failures, speeding up the development process, ensuring high quality, and the broader adoption of SSI solutions. Hence, the main objective of this study was to identify design patterns and good practices of the SSI ecosystems by reviewing and analysing the literature, technical documentation, and existing SSI implementations. Therefore, the study is built on existing knowledge, and presents a comprehensive catalogue of thirty-five SSI design patterns that can serve as a starting point for a possible SSI system design.
Ključne besede: self-sovereign identity, decentralised identity, design patterns, decentralised identifiers, verifiable credentials, blockchain, verifiable data registry, identity wallets
Objavljeno v DKUM: 05.12.2023; Ogledov: 178; Prenosov: 20
.pdf Celotno besedilo (2,31 MB)
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Development of mathematical models in explicit form for design and analysis of axial flux permanent magnet synchronous machines
Franjo Pranjić, Peter Virtič, 2020, izvirni znanstveni članek

Opis: This article proposes a methodology for the design of double-sided coreless axial flux permanent magnet synchronous machines, which is based on a developed model for calculating the axial component of the magnetic flux density in the middle of the distance between opposite permanent magnets, which also represents the middle of the stator. Values for different geometric parameters represent the input data for the mathematical model in explicit form. The input data are calculated by using a simplified finite element method (FEM), which means that calculations of simplified 3D models are performed. The simplified model consists of two rotor disks with surfacemounted permanent magnets and air between them, instead of stator windings. Such a simplification is possible due to similar values of permeability of the air and copper. For each simplified model of the machine the axial component of the magnetic flux density is analyzed along a line passing through the center of opposite permanent magnets and both rotor disks. Values at the middle of the distance between the opposite permanent magnets are the lowest and are therefore selected for the input data at different stator, rotor disks and permanent magnets (PM) thicknesses. Such input data enable the model to consider the nonlinearity of materials.
Ključne besede: axial flux, analysis, coreless, development, design, explicit form, finite element method, mathematical models, permanent magnet, synchronous
Objavljeno v DKUM: 01.12.2023; Ogledov: 278; Prenosov: 10
.pdf Celotno besedilo (2,70 MB)
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Design of Tetra-Peptide Ligands of Antibody Fc Regions Using In Silico Combinatorial Library Screening
Marko Jukič, Sebastjan Kralj, Anja Kolarič, Urban Bren, 2023, izvirni znanstveni članek

Opis: Abstract Peptides, or short chains of amino-acid residues, are becoming increasingly important as active ingredients of drugs and as crucial probes and/or tools in medical, biotechnological, and pharmaceutical research. Situated at the interface between small molecules and larger macromolecular systems, they pose a difficult challenge for computational methods. We report an in silico peptide library generation and prioritization workflow using CmDock for identifying tetrapeptide ligands that bind to Fc regions of antibodies that is analogous to known in vitro recombinant peptide libraries’ display and expression systems. The results of our in silico study are in accordance with existing scientific literature on in vitro peptides that bind to antibody Fc regions. In addition, we postulate an evolving in silico library design workflow that will help circumvent the combinatorial problem of in vitro comprehensive peptide libraries by focusing on peptide subunits that exhibit favorable interaction profiles in initial in silico peptide generation and testing.
Ključne besede: peptide design, in silico combinatorial library, peptide combinatorial library, peptide library design, high-throughput virtual screening, peptide molecular docking, antibody purification, peptide drug design, recombinant peptide libraries
Objavljeno v DKUM: 01.12.2023; Ogledov: 151; Prenosov: 11
.pdf Celotno besedilo (8,11 MB)
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Towards trusted data sharing and exchange in agro-food supply chains: design principles for agricultural data spaces
Martina Šestak, Daniel Copot, izvirni znanstveni članek

Opis: In the modern agricultural landscape, realizing data’s full potential requires a unified infrastructure where stakeholders collaborate and share their data to gain insights and create business value. The agricultural data ecosystem (ADE) serves as a crucial socio-technical infrastructure, aggregating diverse data from various platforms and, thus, advertising sustainable agriculture and digitalization. Establishing trustworthy data sharing and exchange in agro-food value chains involves socioeconomic and technological elements addressed by the agricultural data space (ADS) and its trust principles. This paper outlines key challenges to data sharing in agro-food chains impeding ADE establishment based on the review of 27 studies in scientific literature. Challenges mainly arise from stakeholders’ mistrust in the data-sharing process, inadequate data access and use policies, and unclear data ownership agreements. In the ADE context, interoperability is a particularly challenging topic for ensuring the long-term sustainability of the system. Considering these challenges and data space principles and building blocks, we propose a set of design principles for ADS design and implementation that aim to mitigate the adverse impact of these challenges and facilitate agricultural data sharing and exchange.
Ključne besede: data sharing and exchange, agro-food supply chain, design principles, agricultural data space, agricultural data ecosystem
Objavljeno v DKUM: 30.11.2023; Ogledov: 194; Prenosov: 9
.pdf Celotno besedilo (948,02 KB)
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Geometry design and analysis of an electric bus for the interior ther-mal modelling
Costica Nituca, Gabriel Chiriac, Georgel Gabor, Ilie Nucǎ, Vadim Cazac, Marcel Burduniuc, 2021, izvirni znanstveni članek

Opis: The heating, ventilation and air-conditioning (HVAC) system represents the main auxiliary load for any type of bus. Being the most significant energy-consuming auxiliary load for the electric bus, it must be given special attention in an electric bus system design. To study the heat transfer and thermal optimization for passenger comfort in the electric bus computer-aided design (CAD) is used. The geometry of an electric bus interior is designed considering the main components of the vehicle: passenger cabin, driver’s cabin, windows, walls, and seats. Materials of the same type as those used in the real bus are considered for the geometry model. Based on the heat transfer theory, a thermal model and simulations are made for the heat transfer inside the electric bus. The simulated data are compared with measurement data, and based on these, it can be concluded that the thermal model of the electric bus can be validated and used further for a wide variety of thermal simulation types.
Ključne besede: heat transfer, electric bus, passenger comfort, geometry design, thermal modelling
Objavljeno v DKUM: 13.11.2023; Ogledov: 130; Prenosov: 3
.pdf Celotno besedilo (1,04 MB)
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