1. The effect of biochar applied alone and in combination with mineral and organic fertilisers on the yield of white cabbage and soil propertiesManfred Jakop, Nataša Belšak Šel, Erik Rihter, Tjaša Cenčič, Dušan Klinar, Denis Stajnko, Silva Grobelnik Mlakar, 2023, original scientific article Abstract: The study aimed to investigate the effectiveness of biochar application on fertile soils in a temperate climate during the first year of application. The field trial was conducted on a nutrient-rich silt loam soil at two experimental sites in north-eastern Slovenia (Biš and Skorba). The effect of biochar applied alone or in combination with compost or mineral fertiliser on soil properties and yield of white cabbage was studied. In addition to the control (C), the soil received five treatments including biochar (B; 1.5 t/ha), compost (CO; 1.5 t/ha), biochar-mixed compost (BCO; 3.0 t/ha), standard mineral fertilisers (NPK; NPK 0.35 t/ha, potassium sulphate 0.25 t/ha and calcium ammonium nitrate 0.25 t/ha) and combined application of half the amount
of NPK and BCO (NPK+BCO). The results showed that the applied treatments had no significant influence on the measured soil chemical parameters, except for the amount of total organic carbon, electrical conductivity and pH in Biš and total carbon in Skorba. All investigated parameters (cabbage head weight, head circumference, total and market yield) were higher at the experimental site Skorba. Statistically significant differences were found only at the experimental site Biš, where the treatment influenced all parameters (p < 0.01), except for the head circumference of the cabbage. The NPK and NPK+BCO treatments produced significantly higher total yields (66.7 t/ha and 65.8 t/ha, respectively) and marketable yields (53.2 t/ha and 51.8 t/ha, respectively) compared to the other treatments (41.3-52.6 t/ha and 30.5-42.4 t/ha, respectively). Although the differences between the other treatments were insignificant, a trend of decreasing cabbage yields towards CO > BCO > B was observed. Similar results were also obtained when analysing the average data of the two experimental sites.
Keywords: biochar, soil amendments, fertilisers, soil chemical properties, cabbage yield
Published in DKUM: 23.04.2025; Views: 0; Downloads: 0
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2. Konstruiranje premične naprave za nalaganje palic : diplomsko deloAlen Oset, 2024, undergraduate thesis Abstract: V diplomskem delu je predstavljen postopek konstruiranja 3D modela dvigala za železne palice. Ta bo rešil problem napornega in nevarnega ročnega nalaganja palic v podajalno napravo. S pomočjo teoretičnih osnov o varnosti strojev in raziskave trga nalagalnikov palic smo izbrali tri različne dvižne mehanizme. Iz ocen ekonomske in tehnične vrednosti je bil izbran mehanizem verižnega elevatorja. S preračunom dimenzioniranja smo izbrali velikost elektro motorja in verig ter z metodo končnih elementov preverili nosilnost nosilcev palic. Na koncu so predstavljene značilnosti delovanja dvigala palic s premičnim zalogovnikom.
Keywords: varnost strojev, verižni elevator, analiza trga, konstruiranje
Published in DKUM: 11.04.2025; Views: 0; Downloads: 24
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3. Zasnova vpenjalnega sistema za obdelavo kovaških obreznih orodij z žično erozijo : diplomsko deloMaks Mikša, 2024, undergraduate thesis Abstract: Diplomsko delo se ukvarja z izboljšanjem procesa žične elektro erozijske obdelave (WEDM) v podjetju Marovt d.o.o.. Glavni cilj naloge je konstruiranje in izdelava namenske vpenjalne naprave, za hitrejše in hkrati natančnejše vpenjanje obdelovancev. Naprava odpravlja potrebo po večkratnem centriranju in merjenju, kar znatno skrajšuje čas obdelave in povečuje učinkovitost. Vpenjalna naprava je izdelana iz nerjavečega jekla. Rezultati diplomskega dela so izboljšanje delavnih procesov, zmanjšanje proizvodnih stroškov in povečanje konkurenčnosti podjetja.
Keywords: žična elektro erozijska obdelava, kovanje, obrezovanje, vpenjalni sistemi, mehanska obdelava
Published in DKUM: 11.04.2025; Views: 0; Downloads: 14
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4. School-based exercise programs for promoting cardiorespiratory fitness in overweight and obese children aged 6 to 10Stefan Mijalković, Dušan Stanković, Mario Tomljanović, Maja Batez, Maki Grle, Ivana Grle, Ivan Brkljačić, Josip Jularić, Goran Sporiš, Suzana Žilič Fišer, 2022, review article Abstract: The aim of this study was to conduct a systematic review of the school-based exercise
programs for promoting cardiorespiratory fitness in overweight and obese children aged 6 to 10.
Electronic databases (Web of Science and PubMed) were used as searching tools for collecting
adequate studies published in the past 20 years. A total of 13 studies met the criteria for inclusion in
this review, with a total of 2810 participants, both male and female. According to the results of this
systematic review, overweight and obese children aged 6 to 10 who underwent certain interventions
had their CRF improved. Furthermore, evidence suggested that interventions carried out during
a longer period of time suggested led to greater improvement of cardiorespiratory fitness than
a shorter one, but the level of cardiorespiratory fitness gradually decreases after the intervention.
Keywords: physical activity, physical fitness, motor competence, children, health, monitoring and promoting, sport, sedentary behavior, obesity, well-being
Published in DKUM: 07.04.2025; Views: 0; Downloads: 3
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5. A novel system for quasi-continuous THz signal transmission and receptionAndrej Sarjaš, Blaž Pongrac, Dušan Gleich, 2022, original scientific article Abstract: This paper presents a novel system for generating and receiving quasi-continuous (QC)
TeraHertz (THz) waves. A system design and theoretical foundation for QC-THz signal generation
are presented. The proposed QC-THz system consists of commercially available photo-conductive
antennas used for transmission and reception of THz waves and a custom-designed QC optical
signal generator, which is based on a fast optical frequency sweep of a single telecom distributedfeedback laser diode and unbalanced optical fiber Michelson interferometer used for a high-frequency
modulation. The theoretical model for the proposed system is presented and experimentally evaluated. The experimental results were compared to the state-of-the-art continuous-wave THz system. The comparison between the continuous-wave THz system and the proposed QC-THz system
showed the ability to transmit and receive QC-THz waves up to 300 GHz. The upper-frequency limit
is bounded by the length of the used Michelson interferometer. The presented design of THz signal
generation has a potential for industrial application because it is cost-efficient and can be built using
commercially available components.
Keywords: quasi-continuous, terahertz, photoconductive antenna, wave emittance, wave detection
Published in DKUM: 01.04.2025; Views: 0; Downloads: 2
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6. Toward embedded system resources relaxation based on the event-triggered feedback control approachAndrej Sarjaš, Dušan Gleich, 2022, original scientific article Abstract: The paper describes an event-triggered nonlinear feedback controller design. Event triggering is a real-time controller implementation technique which reduces embedded system utilization
and relaxes task scheduling of the real-time system. In contrast to classic time implementation
techniques, the event-triggered execution is validated regarding the introduced triggering policy.
The triggering rule is a boundary, where the last task value is preserved until the rule is violated.
In the given paper, two different event-triggered strategies are designed for the class of dynamic
systems with integral behavior. Both methods are based on sliding mode controller design, where the
triggering rule of the first design involves only a partial state vector, which is a direct consequence of
the triggering rule derivation throughout the Lyapunov stability analysis. In the second approach,
the sliding mode controller is designed upon prior stabilized systems with the additional term, which
enables derivation of the triggering rule based on the whole state vector. The second approach offers
better closed-loop performance and higher relaxation of the system utilization. The selection of
triggering boundary is related closely to the derived minimal inter-event time, which impacts the
computational burden of the real-time system and closed-loop performance directly. The derived
controllers are compared with the classic sample and hold implementation techniques. The real-time
results are presented, and system performances are confirmed regarding embedded system task
relaxation, lowering the computational intensity and preserving closed-loop dynamics.
Keywords: sliding mode control, event-triggered control, lowering computational intensity, task relaxation
Published in DKUM: 28.03.2025; Views: 0; Downloads: 7
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7. 44th International Conference on Organizational Science Development : Human Being, Artificial Intelligence and Organization, Conference Proceedings2025, proceedings of peer-reviewed scientific conference contributions (international and foreign conferences) Abstract: The 44th International Scientific Conference on the Development of Organisational Science was focused on developing and advancing knowledge in the organisational sciences, with a focus on the contemporary challenges and opportunities of our time. On the one hand, it is humans who have woven the knowledge of organisations and will continue to enrich the knowledge of organisations in the future. On the other hand, we need to take into account the situational factors and the wider environment that are intrinsic to understanding organisations. The title of this year's conference is: Human being, Artificial Intelligence and the Organisation. The society we live in today is going through a period of great change in various areas of our lives. Although our pace sometimes stops, the forces of the environment do not. The pace of change often no longer surprises us. But the pillars of our action, the achievements of human society, are something of which we can be justly proud. Artificial intelligence is one of the forces that has entered our everyday lives in many places in recent times. Where are the opportunities and where are the dangers of artificial intelligence, where is human intelligence still a significant step ahead of artificial intelligence?
Keywords: organization, human being, artificial intelligence, changes, organizational development
Published in DKUM: 20.03.2025; Views: 0; Downloads: 25
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8. Distributed energy resource operation analysis using discrete event-simulationBojan Rupnik, Dušan Kragelj, Simona Šinko, Tomaž Kramberger, 2020, original scientific article Abstract: This paper presents a discrete-event simulation (DES) approach for simulation of distributed energy resources (DER). The DES approach provides means to adapt the energy workloads of the system according to any variations of demands that can occur due to temperature regulation requirements or operational demands. Along with a basic model based on a concrete DER configuration, additional models are presented and analysed in order to demonstrate the adaptability of the DES approach to analyse alternative configurations. The models were tested on historical energy consumption data in order to provide the expected workloads and costs. Models are capable to predict the amount of three different energies and cost for the company based on the inside and outside temperatures.
Keywords: cost, discrete-event simulation, distributed energy resources, energy efficiency, hospitals, logistics
Published in DKUM: 10.03.2025; Views: 0; Downloads: 8
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9. Poslovni načrt za odprtje kozmetičnega salona za manikiro Rock your nailsMateja Vukota, 2022, undergraduate thesis Abstract: Vsakodnevno smo obkroženi z ljudmi, ki so sami podjetniki ali pa si to vsaj želijo biti. Posledično nam je pojem podjetništva poznan, vendar pogosto ne vemo, kje in predvsem kako bi začeli našo podjetniško pot v svetu, v katerem je podjetnikov že mnogo. Naš namen je bil sestaviti ustrezen poslovni načrt za odprtje kozmetičnega podjetje Rock your nails.
V teoretičnem delu smo se osredotočili na pregled tako domače kot tudi tuje literature, ki nam je v pomoč pri spoznavanju pojmov, kot so podjetje, podjetnik in poslovni načrt. Slednji nam je tudi vodilo za zapis poslovnega načrta za kozmetični salon. V raziskovalnem delu smo predstavili že ustanovljeno kozmetično podjetje M – cosmetics, kjer so nam tudi omogočili eno izmed metod raziskovanja, intervju z direktorico podjetja. Le-ta nam je v veliko pomoč tako pri pisanju poslovnega načrta kot tudi pri odprtju lastnega podjetja. Z analizo odgovorov in dobljenih podatkov iz ankete smo odgovorili na zastavljena raziskovalna vprašanja, ki so se navezovala na starost strank, storitve, ki si jih želijo obiskovati ter dejavnike, ki vplivajo na obisk storitve.
Skozi analizo rezultatov smo spoznali, katere so naše potencialne stranke in predvsem kaj si le-te želijo pri kozmetičnih salonih. Spoznali smo pomembnost poslovnega načrtovanja v večletnem obdobju, predvsem na področju širitve kozmetičnega salona. Naša ugotovitev je bila, da je poslovni načrt pomagal pri odprtju novega kozmetičnega salona Rock your nails.
Keywords: poslovni načrt, podjetje, podjetnik
Published in DKUM: 21.02.2025; Views: 0; Downloads: 46
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10. Energetska učinkovitost in trajnost visokonapetostnih sistemov : diplomsko deloDušan Popović, 2024, undergraduate thesis Abstract: Diplomsko delo se osredotoča na pomen trajnostnega razvoja energetskih sistemov, zlasti vioskonapetostnih sistemov, ki so ključni za stabilno oskrbo z energijo. Avtor raziskuje, kako izboljšati učinkovitost teh sistemov in zmanjšati njihov ekološki vpliv. Poudarek je na prehodu k obnovljivim virom energije, povečanju energetske učinkovitosti ter vključevanju naprednih tehnologij, kot so pametna omrežja. Delo se ukvarja tudi s političnimi in ekonomskimi izzivi pri uvajanju trajnostnih praks v energetskem sektorju ter pomembnostjo mednarodnega sodelovanja in inovacij za doseganje trajnostnega razvoja.
Keywords: Energija, učinkovitost, visokonapetostni sistemi
Published in DKUM: 07.02.2025; Views: 0; Downloads: 10
Full text (1,09 MB) |
