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1.
6th International Conference En-Re Energy & Responsibility : Book of Extended Abstracts
2024

Opis: In the context of escalating climate challenges, the EnRe conference is dedicated to exploring pathways to climate neutrality and the sustainable green transition. The conference is focused on the development and implementation of innovations supporting the transformation of energy systems, industrial systems, and living systems, all with the goal of creating a sustainable future with net-zero emissions. The conference brings together experts, researchers, policymakers, and business leaders to share their experiences, research, and visions. The aim of the conference is to foster collaboration and exchange of ideas, and to collectively develop comprehensive approaches and strategies for achieving climate neutrality. This conference is not just a knowledge exchange, but also a platform for encouraging concrete actions that will ensure a greenerand more sustainable future for our next generations to come.
Ključne besede: alternative energy systems, dynamic tariffing, electrical machines and drives, energy conversions, financing energy projects, nuclear energy, conventional energy systems, climate changes - climate pan, mathematical methods in engineering, micro and nano energy, low-carbon technologies and strategies, renewable energy technologies heating and cooling systems, smart buildings, cities and networks, policies and strategies for renewable energy sources, energy efficiency and the climate
Objavljeno v DKUM: 17.05.2024; Ogledov: 83; Prenosov: 18
.pdf Celotno besedilo (10,40 MB)
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High strain-rate deformation analysis of open-cell aluminium foam
Anja Mauko, Mustafa Sarıkaya, Mustafa Güden, Isabel Duarte, Matej Borovinšek, Matej Vesenjak, Zoran Ren, 2023, izvirni znanstveni članek

Opis: This study investigated the high-strain rate mechanical properties of open-cell aluminium foam M-pore®. While previous research has examined the response of this type of foam under quasi-static and transitional dynamic loading conditions, there is a lack of knowledge about its behaviour under higher strain rates (transitional and shock loading regimes). To address this gap in understanding, cylindrical open-cell foam specimens were tested using a modified Direct Impact Hopkinson Bar (DIHB) apparatus over a wide range of strain rates, up to 93 m/s. The results showed a strong dependency of the foam's behaviour on the loading rate, with increased plateau stress and changes in deformation front formation and propagation at higher strain rates. The internal structure of the specimens was examined using X-ray micro-computed tomography (mCT). The mCT images were used to build simplified 3D numerical models of analysed aluminium foam specimens that were used in computational simulations of their behaviour under all experimentally tested loading regimes using LS-DYNA software. The overall agreement between the experimental and computational results was good enough to validate the built numerical models capable of correctly simulating the mechanical response of analysed aluminium foam at different loading rates.
Ključne besede: Open-cell aluminium foam, Micro-computed tomography, High-strain rate, Direct impact hopkinson bar, Digital image correlation, Computer simulation
Objavljeno v DKUM: 06.12.2023; Ogledov: 330; Prenosov: 28
.pdf Celotno besedilo (3,28 MB)
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4.
ARM-Based Video Intercom System with Next-Gen Human Presence Detection using Deep Learning : magistrsko delo
Mario Gavran, 2022, magistrsko delo

Opis: This master's thesis presents an advanced video system with human presence detection based on deep learning and an ARM microcontroller. The objective of the thesis is to develop a system that works as a smart video intercom, which could be installed, e.g. on the entrance door, and autonomously alert the owner that a guest is in front of the door. The main goal is to use an AI algorithm, namely the neural network model on a constrained device, such as an ARM microcontroller, as their main advantage is lower power consumption and cost. The thesis also describes commonly used methods to reduce the power and memory footprint and to implement and accelerate the deep learning algorithms more effectively. Further, the most notable deep learning hardware and some general platforms are described in more detail. The thesis also presents the development of a human presence detection system based on an ARM microcontroller, VGA camera, and LCD, where Tensorflow Lite Micro, an open-source C++ framework for deploying deep learning models to embedded platforms and a pre-trained neural network model for person presence detection are used.
Ključne besede: TensorFlow Lite Micro, Video intercom system, ARM Cortex-M microcontroller, Human presence detection, Neural network
Objavljeno v DKUM: 08.07.2022; Ogledov: 689; Prenosov: 52
.pdf Celotno besedilo (7,86 MB)

5.
Razvijanje naravoslovnih in digitalnih kompetenc v fiziki z bbc micro:bit-om : magistrsko delo
Peter Bernad, 2022, magistrsko delo

Opis: Načrtovanje osnovnošolskih fizikalnih poskusov je lahko velik izziv, če nas zanima ustrezna zahtevnost ter učinkovitost izvedbe. Pri tem si lahko pomagamo z razpoložljivimi orodji in pripomočki, saj lahko denimo kompleksne fizikalne poskuse podpremo z različnimi računalniškimi animacijami, videoposnetki in simulacijami. Menimo, da je pri fizikalnih poskusih ključnega pomena tudi razvijanje naravoslovne pismenosti, naravoslovnih kompetenc in povezovanje fizikalnih pojavov z vsakdanjim življenjem. Poleg krepitve naravoslovne pismenosti ne smemo pozabiti na digitalne kompetence, ki bi jih učenci morali usvajati pri vsakem predmetu. V magistrskem delu predstavimo razvoj naravoslovnih in digitalnih kompetenc skozi fizično računalništvo z uporabo mikrokrmilnika BBC Micro:bit. Najprej predstavimo namen in primere eksperimentalnega dela pri pouku osnovnošolske fizike s poudarkom na fizikalnem računalništvu. Nato predstavimo zbirko vaj, ki smo jo najprej pilotno testirali z devetošolci in glede na rezultate izboljšali za osrednje testiranje. Na koncu podamo rezultate glede učinkovitosti zbirke vaj in razmislek o možni vključitvi v pouk fizike. Rezultati kažejo, da je zbirka vaj učinkovita, vendar bi bila potrebna še bolj poglobljena analiza glede optimalne vključitve zbirke poskusov v obvezni predmet fizika zaradi časovnih omejitev.
Ključne besede: BBC Micro:bit, eksperimentalno delo, fizično računalništvo, pouk fizike, naravoslovne kompetence, digitalne kompetence
Objavljeno v DKUM: 15.06.2022; Ogledov: 730; Prenosov: 42
.pdf Celotno besedilo (2,94 MB)

6.
5th International Conference EnRe - Energy & Responsibility : book of extended abstracts
2022, zbornik

Opis: The tendency to improve energy devices, the impact of environmental factors and the development of new technologies for the exploitation of sustainable resources contribute to the fact that we have witnessed intensive energy development in the last decade. The two most important Slovenian energy pools, located in Velenje and Krško, are at the turning point of renovation, and are facing major challenges in the design and planning of modern energy devices. The current generation faces a great ethical responsibility to leave their descendants a world with as little human impact on the environment as possible. Therefore, communication between experts and researchers, discussion and exchange of different views for the future is of the utmost importance, which is exactly the purpose of the EnRe Conference.
Ključne besede: renewable energy and energy storage systems, classic energy systems, policies and strategies for RES, alternative energy systems, energy conversions, energy transfer, electrical machine, thermal machines, mathematical methods in energy engineering, environmental protection, micro and nano energetics, hydrogen technologies, low carbon technologies and strategies, nuclear energy, smart buildings, smart cities and smart grids
Objavljeno v DKUM: 09.06.2022; Ogledov: 1287; Prenosov: 89
.pdf Celotno besedilo (14,78 MB)
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Gradivo je zbirka in zajema 17 gradiv!

7.
Vizualizacija procesa preoblikovanja s krmilnikom in mikro zaslonom : diplomsko delo
Bojan Vidovič, 2018, diplomsko delo

Opis: Diplomsko delo opisuje avtomatizacijo in vizualizacijo elektropnevmatskega sistema z mikro krmilnikom ter mikro zaslonom na dotik. Predstavljeni so tako postopki programiranja in vizualizacije procesa kakor tudi uporabljena strojna oprema Siemens S7-200 ter Micro Panel – SIMATIC TP 177micro. Pričujoče delo opisuje tudi povezave z resničnim sistemom, različne možnosti uporabe programske opreme SIMATIC WinCC Flexible Advanced in težave, s katerimi se lahko pri uporabi srečujemo, poleg tega pa še programski paket STEP 7-Micro/WIN, uporabljen za programiranje krmilnika. Po korakih so predstavljene tudi informacije ter postopki, potrebni za konfiguracijo programov in strojne opreme ter povezavo med njimi.
Ključne besede: PLK, HMI, elektropnevmatski sistem, STEP 7-Micro/WIN, Siemens SIMATIC S7-200, Siemens SIMATIC WinCC flexible Advanced, Micro Panel – SIMATIC TP 177micro.
Objavljeno v DKUM: 26.09.2018; Ogledov: 1114; Prenosov: 110
.pdf Celotno besedilo (2,34 MB)
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8.
Micro-scale responses of granular materials under different confining pressures using the discrete element method
Mahmud Sazzad, 2016, izvirni znanstveni članek

Opis: Biaxial compression tests were carried out on assemblies of ovals to study the micro-scale responses of granular materials under different confining pressures using the discrete element method (DEM). A total of 8450 ovals were generated in a rectangular frame without any overlap. Four dense samples were prepared from the initially generated sparse sample under different confining pressures. The simulated results yield a stress-straindilatancy behaviour similar to that observed in sands under different confining pressures. The evolution of the different microparameters and their inter-relationships are established. When the confining pressure is relatively high, the difference between the coordination number and the effective coordination number is very small; however, the difference is apparent for a low confining pressure. The microtopology of the granular assembly at several important states of shear is also reported. It is noted that the topological distribution of the granular materials is confining- pressure dependent. The normalized void-cell number is a minimum under the lowest confining pressure, whereas the same number is a maximum under the highest confining pressure. A linear relationship is observed between the normalized void-cell number and the effective coordination number, regardless of the confining pressures. The evolution of the deviatoric fabric for different confining pressures is measured and the macro-micro relationship is presented.
Ključne besede: microstructures, confining pressure, fabric, microtopology, coordination number, macro-micro relationship
Objavljeno v DKUM: 15.06.2018; Ogledov: 1447; Prenosov: 92
.pdf Celotno besedilo (440,72 KB)
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9.
A comparison between conventional triaxial and plane-strain compression on a particulate system using 3D DEM
Mahmud Sazzad, Kiichi Suzuki, 2012, izvirni znanstveni članek

Opis: Granular materials such as sand are subjected to different stress paths depending on the in-situ conditions. For example, a granular system under the foundations experiences conventional triaxial compression (CTC), while it experiences plane-strain compression (PSC) in the case of the embankment of roads. Due to the difference in the stress paths, the behavior of granular materials also becomes different. This paper aims at comparing the behavior of granular materials under CTC and PSC conditions using the 3D discrete-element method (DEM). An isotropically compressed dense sample consisting of 8000 spheres was prepared numerically using periodic boundaries. The CTC and PSC tests were simulated using the same isotropically compressed dense sample to compare and explore the macro- and micro-mechanical responses of granular materials without any bias from the initial fabric of the numerical sample. Qualitatively, the simulated stress-strain responses are consistent with that observed in the experimental studies. The dilatancy index is found to be independent of the stress paths used in the present study. The b value (defined as b = (σ2 − σ3)/(σ1 − σ3) where σ1, σ2 and σ3 are the stresses in the x1 -, x2 - and x3 - directions, respectively) - axial strain curve has a close similarity with the stress ratio - axial strain curve for the PSC test. The evolution of the coordination number and the sliding contact fraction is independent of the stress paths. A link between the macro- and micro-quantities is observed and a unique macro-micro relationship is noticed, regardless of the stress paths applied in this study.
Ključne besede: conventional triaxial compression, plane-strain compression, micro response, DEM
Objavljeno v DKUM: 13.06.2018; Ogledov: 1161; Prenosov: 61
.pdf Celotno besedilo (257,70 KB)
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10.
An analysis of corruption in microenterprises
Mladen Tomašič, 2009, izvirni znanstveni članek

Opis: The purpose of this study is to present the research work made whilst studying the presence of corruption in the operations of Slovenian micro-enterprises. Our study builds on research which we carried out in 2005 and compares the findings of both studies. We wish to present our findings to public experts for a professional assessment and provide a basis for further work. We hope that in this way we can contribute to the development of new guidelines for the preparation of further analysis, the causes and elimination or at least limitation of corruption in business operations. Notable studies, which address corporate corruption in Slovenia, are non-existent. The results have confirmed the basic research hypothesis that the presence of corruption in the micro-business environment compared to a previous study in the last five years has increased.
Ključne besede: micro-enterprise, micro-entrepreneur, corruption, corruptness
Objavljeno v DKUM: 28.11.2017; Ogledov: 943; Prenosov: 287
.pdf Celotno besedilo (1,09 MB)
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