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Slow growth storage of Berula erecta in vitro - effect of sucrose, sorbitol and temperature
Jana Ambrožič-Dolinšek, Sanja Oblonšek, Terezija Ciringer, 2022, izvirni znanstveni članek

Opis: It has been established that in vitro storage of Berula erecta (Huds.) Coville by slow growth would rationalize the culture maintenance by reducing the number of transfers to fresh medium. Attempts of slow growth were made while maintaining viability by adding sugars and sugar alcohols to the MS medium and lowering the culture temperature in the growth chambers. The effect of low temperatures (13°C and 4°C), different combinations and concentrations of sorbitol (20, 40 g L-1) and sucrose (30, 40 g L-1), and light was tested to determine the viability and ability of B. erecta to recover growth. Increasing sucrose concentration did not inhibit or slow growth. At 23 ± 2°C, the addition of 20 g L-1 sorbitol successfully inhibited growth, while the addition of 40 g L-1 sorbitol resulted in plant senescence after two months of culturing. Storage of B. erecta at 13°C did not effectively inhibit growth and recovery ability in any treatment. The most effective way to maintain B. erecta for long-term slow growth storage in tissue culture while retaining a high level of viability with minimal growth was to culture the plants at 4°C in the dark. This kept the plants viable and capable of regeneration for several months.
Ključne besede: slow growth storage, viability, sucrose, sorbitol, temperature, Berula erecta
Objavljeno v DKUM: 23.05.2024; Ogledov: 122; Prenosov: 4
.pdf Celotno besedilo (878,32 KB)
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A novel autonomous vehicle-based storage and retrieval system with movable lifts
Banu Y. Ekren, Tone Lerher, Boris Jerman, 2023, objavljeni znanstveni prispevek na konferenci

Opis: This paper presents a novel autonomous vehiclebased storage and retrieval system with movable lifts (AVS/RS/ML) as an alternative automated warehousing technology to tier-captive shuttle-based storage and retrieval systems (SBS/RS). The proposed system aims to provide a costeffective, highly efficient, and adaptable solution for warehouse operations utilizing automated guided vehicles (AGVs) capable of travelling both inside and outside the warehouse. We simulate and analyse the system's performance based on its initial investment cost, throughput capacity, and average utilization of AGVs and movable lifts (MLs) under different warehouse designs.
Ključne besede: automated warehousing, AVS/RS, movable lifts with AGVs, storage and retrieval sequences, performance analyses
Objavljeno v DKUM: 19.02.2024; Ogledov: 167; Prenosov: 7
.pdf Celotno besedilo (869,23 KB)
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Comparative analysis of batteries for photovoltaic systems : bachelor's thesis
Kristina Gočanin, 2023, diplomsko delo

Opis: Renewable energies represent unlimited power sources that are significantly reducing greenhouse emissions. The possibilities and advantages of abundantly available solar energy are immense. However, some challenges are preventing solar energy from reaching its full potential regarding its efficiency and energy storage. Therefore, the main focus of this thesis is on electrochemical storage systems. The aim is to compare the currently leading technology – Li-ion battery to the most recent breakthrough in storage systems – the solid-state battery. The thesis includes a comparative analysis of the mentioned technologies, as well as the theoretical part that introduces solar energy and photovoltaic systems with their main components.
Ključne besede: photovoltaic system, energy storage, analysis, Li-ion battery, solid-state battery
Objavljeno v DKUM: 30.01.2024; Ogledov: 338; Prenosov: 28
.pdf Celotno besedilo (2,35 MB)

Analysis of photovoltaic system with battery storage in winter period
Jan Lokar, Peter Virtič, 2019, objavljeni znanstveni prispevek na konferenci

Opis: Energy sources as a solar, wind and water energy are used in production of electrical energy. Their biggest advantage is that they are renewable and they are sustainable. On the other hand, production from renewable energy sources is limited by environmental conditions. Production of photovoltaic systems are dependent on solar radiation, temperature, incidence angle, shadowing and other variable quantities. That is why designing of photovoltaic system is complex. In this paper a photovoltaic system production analysis and consumption analysis in residential house are presented. With real measured data the consumption and production are compared and energy balance equations, battery charge and discharge model are defined and behaviour of battery storage system through the one day are analysed. In addition, the reactive energy production and consumption are also analysed.
Ključne besede: photovoltaic system, battery storage
Objavljeno v DKUM: 05.12.2023; Ogledov: 210; Prenosov: 14
.pdf Celotno besedilo (607,39 KB)
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Experimental validation of a dynamic photovoltaic/thermal collector model in combination with a thermal energy storage tank
Klemen Sredenšek, Sebastijan Seme, Bojan Štumberger, Miralem Hadžiselimović, Amor Chowdhury, Zdravko Praunseis, 2021, izvirni znanstveni članek

Opis: The primary objective of this paper is to present a dynamic photovoltaic/thermal collector model in combination with a thermal energy storage tank. The added value of the proposed model is the use and integration of existing dynamic models for describing the entire photovoltaic/thermal system. The presented model was validated using measurements on the experimental system located at the Institute of Energy Technology, Faculty of Energy Technology, University of Maribor. The validation was carried out based on three different weather conditions—sunny, cloudy, and overcast. The validation results were evaluated using the normalized root mean square error and mean absolute percentage error for the temperature and output power of the photovoltaic/thermal collector and the temperature of the thermal energy storage tank. The model results concurred with the measurements, as the average mean absolute percentage error values for the temperature and output power of the photovoltaic/thermal collector and thermal energy storage tank temperature were 5.82%, 1.51%, and 7.58% respectively.
Ključne besede: photovoltaic/thermal collector, thermal energy storage tank, dynamic modeling, temperature distribution, output power
Objavljeno v DKUM: 13.11.2023; Ogledov: 250; Prenosov: 13
.pdf Celotno besedilo (8,22 MB)
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The energy self-sufficiency of the research facility at the institute of energy technology
Nejc Friškovec, Manja Obreza, Klemen Sredenšek, Sebastijan Seme, 2022, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: photovoltaic system, battery storage system, energy self-sufficiency, research facility
Objavljeno v DKUM: 27.10.2023; Ogledov: 412; Prenosov: 4
.pdf Celotno besedilo (14,78 MB)
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Recent advances in the development of automotive catalytic converters: a systematic review
Laura Robles-Lorite, Ruben Dorado Vicente, Eloisa Torres Jiménez, Gorazd Bombek, Luka Lešnik, 2023, pregledni znanstveni članek

Opis: Despite the current boost in the use of electric vehicles to reduce the automotive sector’s footprint, combustion vehicles are and will be present in our cities in both the immediate and long term. In this sense, catalytic converters, which are exhaust gas post-treatment systems for vehicle emission control, are critical for complying with increasingly stringent environmental regulations. This work proposes a systematic review to identify the most relevant knowledge regarding the parameters (materials, geometries, and engine conditions), conditions (cold start, oxygen storage, and deactivation), and mathematical models to consider in the design of catalytic converters. The Scopus database contains 283 records related to this review’s objective. After applying the inclusion and exclusion criteria, 65 reports were retrieved for evaluation. A table was created to present the results and prepare this manuscript. The evaluation revealed that the following topics were active: the study of non-noble catalyst materials, as well as new substrate materials and geometries, for designing more compact and cost-effective catalytic converters; the development of strategies to improve conversion during cold starts; and the development of accurate and fast estimation models.
Ključne besede: automotive converters, catalytic converters, emissions reduction, exhaust gas post-treatment, catalyst deactivation, oxygen storage, numerical models
Objavljeno v DKUM: 06.09.2023; Ogledov: 377; Prenosov: 24
.pdf Celotno besedilo (532,89 KB)
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Cost and performance comparison of tier-captive SBS/RS with a novel AVS/RS/ML
Banu Y. Ekren, Tone Lerher, Melis Küçükyaşar, Boris Jerman, 2023, izvirni znanstveni članek

Opis: This paper introduces a novel autonomous vehicle-based storage and retrieval system that utilizes movable lifts (AVS/RS/ML), proposed as an alternative to the tier-captive shuttle-based storage and retrieval system (SBS/RS). The newly proposed system aims to provide an affordable solution with highly utilised AGVs, that can also perform operations out of warehouse. The performance of this novel system is compared with the equivalent tier-captive SBS/RS warehouse design, where each shuttle is dedicated in a specific tier in that design. The comparison is based on the initial system investments costs, throughput rates, and average utilisation of lifts/MLs in the system. Collision prevention rules are also applied to AVS/RS/ML, and its performance is tested through simulation. The results show that the tier-captive SBS/SR system becomes cost-efficient under high throughput rate requirements, while the AVS/RS/ML technology is preferred for relatively moderate and low process rate requirements. The unit-cost per month performance metric of AVS/RS/ML is less sensitive to an increase in number of tiers in the system, compared to the tier-captive SBS/RS case, indicating that AVS/RS/ML may be promising for high-tier warehouse system designs.
Ključne besede: warehouse design, warehousing systems, materials handling, novel autonomous vehicle-based storage and retrieval system, movable lifts
Objavljeno v DKUM: 23.06.2023; Ogledov: 304; Prenosov: 18
.pdf Celotno besedilo (1,14 MB)
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