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Amina Uglješa, 2023, magistrsko delo

Opis: Hydrogen is playing an important role in many sectors of modern economy (green vehicles, energy conversion and storage in electrical grids, processing industry). Solid oxide electrolysis cell (SOEC) is an emerging technology for the production of hydrogen from steam and electrical energy as well as for renewable energies storage. Unfortunately, operating at high current and electrical transients cause degradation that leads to premature end of life. A remedy is to implement a hardware module capable to perform online condition monitoring and optimization of SOEC systems resulting in improved overall performance and extended lifetime. That is expected to significantly expand their deployment on the market. However, very little has been done so far. The H2020 project REACTT seems to be one of the first attempts to build an embedded system for monitoring, diagnosis, prognostics, and control (MDPC) for SOEC system. The underlying master's thesis contributes to the REACTT project in the segment related to the supervision of different modules of the MDPC system. The supervisor module is aimed to orchestrate the operation of various functional modules (agents) such as data acquisition, system optimization, diagnosis, prognostics, and mitigation. The thesis focuses on the design of the supervisor module and its implementation on a control platform based on Raspberry Pi 4. The main contributions of the thesis are twofold. First, the dynamic operation of the supervisor modelled by using the state transition diagram (STD). Second, the code for implementation of the supervisor on the target platform done in Python in a way that complies with the requirements imposed in the project.
Ključne besede: supervisor, module, agent, method, solid oxide electrolysis cell system, diagnosis, prognostics, real-time optimization, Python programming, state transition diagram
Objavljeno v RUNG: 20.06.2023; Ogledov: 412; Prenosov: 8
.pdf Celotno besedilo (2,94 MB)

A comparative study of nanolaminate CrN/Mo2N and CrN/W2N as hard and corrosion resistant coatings
Marco Beltrami, Andraž Mavrič, Simone Dal Zilio, Mattia Fanetti, Gregor Kapun, Marco Lazzarino, Orfeo Sbaizero, Miha Čekada, 2013, izvirni znanstveni članek

Opis: Nanolaminate coatings (NLC) consisting of alternated CrN coupled with either cubic tungsten nitride (β-W2N) or molybdenum nitride (γ-Mo2N) were deposited on cold worked tool steel substrates using reactive DC reactive magnetron sputtering for improved mechanical and corrosion resistance. The CrN/γ-Mo2N and CrN/β-W2N nanolaminate systems were found to perform better than the corresponding single-layer systems, with both mechanical and electrochemical properties improving by decreasing the individual layer thickness from 100 to 5 nm. The CrN/β-W2N NLC combined the high hardness value of W2N with the low corrosion current of CrN. The CrN/γ-Mo2N NLC showed synergistic improvements consisting of both higher hardness and lower corrosion currents with respect to the constituent materials alone. The dependence of mechanical and corrosion properties on the bilayer period is discussed in terms of the grain size, residual stresses and texture of the constituent materials and the nanostructured character of the multilayer architecture.
Ključne besede: Nanolayered coatings, Transition metal nitrides, Sputtering, Nanoindentation, Corrosion resistance, Mechanical properties
Objavljeno v RUNG: 12.01.2023; Ogledov: 548; Prenosov: 0
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Helix-coil theory to process experimental data for short polypeptides in solvent
Knarik Yeritsyan, Matjaz Valant, Artem Badasyan, 2022, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: Zimm-Bragg model, helix-coil transition, thermal unfolding, chain length
Objavljeno v RUNG: 10.10.2022; Ogledov: 573; Prenosov: 0
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Higgs boson decay into two photons at ATLAS : diploma seminar
Bojana Stefanoska, 2022, raz. nal. na višji ali visoki šoli

Ključne besede: Higgs boson, ATLAS detector, photon decay channel, photons, ferromagnetic phase transition
Objavljeno v RUNG: 25.08.2022; Ogledov: 832; Prenosov: 0
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Solutions of the Ising model : written report
Jaka Strajn, 2022, raz. nal. na višji ali visoki šoli

Ključne besede: Ising model, transfer matrix method, mean-field model, variational principle, ferromagnetic phase transition
Objavljeno v RUNG: 15.06.2022; Ogledov: 857; Prenosov: 0
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System size dependence in the Zimm-Bragg model : partition function limits, transition temperature and interval
Artem Badasyan, 2021, izvirni znanstveni članek

Opis: Within the recently developed Hamiltonian formulation of the Zimm and Bragg model we re-evaluate several size dependent approximations of model partition function. Our size analysis is based on the comparison of chain length N with the maximal correlation (persistence) length ξ of helical conformation. For the first time we re-derive the partition function of zipper model by taking the limits of the Zimm–Bragg eigenvalues. The critical consideration of applicability boundaries for the single-sequence (zipper) and the long chain approximations has shown a gap in description for the range of experimentally relevant chain lengths of 5–10 persistence lengths ξ. Correction to the helicity degree expression is reported. For the exact partition function we have additionally found, that: at N/ξ ≈ 10 the transition temperature T m reaches its asymptotic behavior of infinite N; the transition interval ∆T needs about a thousand persistence lengths to saturate at its asymptotic, infinite length value. Obtained results not only contribute to the development of the Zimm–Bragg model, but are also relevant for a wide range of Biotechnologies, including the Biosensing applications.
Ključne besede: Zimm-Bragg model, helix-coil transition, zipper model
Objavljeno v RUNG: 17.06.2021; Ogledov: 1544; Prenosov: 76
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Dissecting Mott and charge-density wave dynamics in the photoinduced phase of 1T-TaS[sub]2
Alberto Simoncig, Matija Stupar, Barbara Ressel, Tanusree Saha, Primož Rebernik Ribič, Giovanni De Ninno, 2021, izvirni znanstveni članek

Opis: The two-dimensional transition-metal dichalcogenide 1T−TaS2 is a complex material standing out for its puzzling low temperature phase marked by signatures amenable to both Mott-insulating and charge-density wave states. Electronic Mott states, coupled to a lattice, respond to coherent optical excitations via a modulation of the lower (valence) Hubbard band. Such dynamics is driven by strong electron-phonon coupling and typically lasts for tens of picoseconds, mimicking coherent structural distortions. Instead, the response occurring at the much faster timescale, mainly dominated by electronic many-body effects, is still a matter of intense research. By performing time- and angle-resolved photoemission spectroscopy, we investigated the photoinduced phase of 1T−TaS2 and found out that its lower Hubbard band promptly reacts to coherent optical excitations by shifting its binding energy towards a slightly larger value. This process lasts for a time comparable to the optical pump pulse length, mirroring a transient change of the onsite Coulomb repulsion energy (U). Such an observation suggests that the correction to the bare value of U, ascribed to the phonon-mediated screening which slightly opposes the Hubbard repulsion, is lost within an interval of a few tens of femtoseconds and can be understood as a fingerprint of electronic states largely decoupled from the lattice. Additionally, these results enforce the hypothesis, envisaged in the current literature, that the transient photoinduced states belong to a sort of crossover phase instead of an equilibrium metallic one.
Ključne besede: ultrafast phenomena, time resolved photoemission, strongly correlated systems, transition metal dichalcogenide
Objavljeno v RUNG: 13.04.2021; Ogledov: 1857; Prenosov: 0
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Seeing words on the screen, Béla Balázs, "Fraeulein Else" and the emergence of the film script
Eszter Polonyi, prispevek na konferenci brez natisa

Ključne besede: film history, sound transition, Elizabeth Bergner, film theory, history of medicine
Objavljeno v RUNG: 11.12.2020; Ogledov: 1882; Prenosov: 0
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Mind the Wall: animated short films from Central and Eastern Europe reflecting on the year 1989
Eszter Polonyi, vabljeno predavanje na konferenci brez natisa

Ključne besede: film history, animation, Central Eastern European cultural history, cultural politics of political transition
Objavljeno v RUNG: 11.12.2020; Ogledov: 1727; Prenosov: 0
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Postcommunism as a Contradictory Combination of Competing Elements
Gal Kirn, 2015, recenzija, prikaz knjige, kritika

Ključne besede: postcommunist cinema, transition in Eastern films, postcommunism
Objavljeno v RUNG: 19.08.2020; Ogledov: 1700; Prenosov: 0
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