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1.
Numerical analysis of a wind turbine blade with different software
Gorazd Hren, 2019, izvirni znanstveni članek

Opis: The development of wind power generation technology recognises the wind turbine blade design and manufacturing as crucial for its performance. The laboratory size wind turbine blade was analysed, considering the 3D printing plastic material for blades. Applying the structural dynamic equations of blades, the aero-elastic model of the rotating rotor and the numerical simulation method of the deflections are presented under the aerodynamic loads and centrifugal forces. Based on the parameters of aerofoil and the geometrical parameters of blade, 3D model of the blade was established with the modelling software. Then the model was introduced into computational flow dynamics software to carry out the loads on the blade and further into numerical structural analysis. The analysis was performed in two different software packages. Design of wind turbine blades depends on high precision, reliable and robust numerical predictions of performance where the plug-in software is found to be inadequate for nontrivial problems.
Ključne besede: computational fluid dynamics, numerical analysis, structural analysis, wind turbine blade
Objavljeno v DKUM: 22.02.2024; Ogledov: 39; Prenosov: 0
.pdf Celotno besedilo (1,68 MB)
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2.
Reconstruction of a fluid bed device for separating granular material from the grinding process of rapid antigen tests
Miha Jordan, Tilen Švarc, Peter Majerič, Rebeka Rudolf, Matej Zadravec, 2023, izvirni znanstveni članek

Opis: The article includes the study and reconstruction of a fluid bed device with the purpose of separating the granular material from the grinding process of rapid antigen tests. The following techniques were performed, with the purpose of characterisation of the ground particles: sieve analysis, X-ray fluorescence spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy and transmission electron microscopy. The paper includes experimental testing of a simplified separation process with zeolite spheres and paper strips, supported by a numerical model. The flow conditions’ impact on the behaviour and interactions of particles of the considered problem were simulated using coupled computational fluid dynamics (CFD) and the discrete element method (DEM) approach. The separation process of zeolite spheres and paper strips was found to be efficient. The simulation results showed the appropriate behaviour of the particles during the process. We explained the results’ deviations, and we also presented the shortcomings and possible improvements. Further research is required to define the adequacy of the process, while using actual ground material of rapid antigen tests.
Ključne besede: rapid antigen tests, nanomaterials, fluidised bed, computational fluid dynamics, discrete element method, characterisation
Objavljeno v DKUM: 05.01.2024; Ogledov: 142; Prenosov: 8
.pdf Celotno besedilo (4,21 MB)
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3.
Influence of Numerical Mesh Type on Airfoil Aerodynamic Characteristics
Marko Pezdevšek, Matej Fike, Andrej Predin, Gorazd Hren, 2019, objavljeni znanstveni prispevek na konferenci

Opis: In this paper, we will examine how different mesh types affect the aerodynamic characteristic of an airfoil. The airfoil used for this paper was the NREL S809. Three different mesh types were created, a blocked structured mesh, an unstructured mesh and a hybrid mesh containing a blocked structured mesh near the surface of the airfoil and an unstructured mesh on the outside perimeter. Steady state simulations were performed for angles of attack between 0°and 22°. Lift and drag coefficient for all created meshes were compared to experimental results from literature. From angles of attack between 2° and 8° all three meshes predict similar lift and drag coefficients. We encountered problems with convergence for the unstructured mesh at angles of attack higher than 8°. Structured and hybrid mesh had similar lift and drag coefficients across all angles of attack.
Ključne besede: computational fluid dynamics, NREL S809, structured mesh, unstructured mesh, hybrid mesh
Objavljeno v DKUM: 04.12.2023; Ogledov: 154; Prenosov: 9
.pdf Celotno besedilo (18,06 MB)
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4.
Vpliv kritičnih dejavnikov uspeha na uvedbo ERP rešitve Microsoft Dynamics Business Central
Laura Jurgec, 2023, magistrsko delo

Opis: Podjetja za uspešno poslovanje potrebujejo orodje, ki jim pomaga pri avtomatizaciji in upravljanju njihovih osnovnih poslovnih procesov. To orodje so celovite informacijske rešitve oziroma rešitve ERP. Rešitve ERP pomagajo pri pretoku podatkov med različnimi oddelki podjetja, kot so finance, nabava, prodaja, proizvodnja itd., in ker so podatki shranjeni v skupni bazi podatkov, vsi oddelki vidijo enake podatke, zaradi česar ne more priti do podvajanja podatkov. Rešitve ERP lahko korenito izboljšajo učinkovitost poslovanja podjetja, zato se vse več podjetij odloča za njihovo uvedbo, vendar pa se mnogokrat zgodi, da je uvedba neuspešna. Z namenom, da bi bilo čim manj neuspešnih uvedb rešitev ERP, so bili vpeljani t. i. kritični dejavniki uspeha, ki nam pomagajo oziroma nas vodijo do opredelitve tistega, kar nam največ pomeni. Na te izsledke se nato osredotočimo tudi pri sami uvedbi rešitve ERP. Na začetku magistrskega dela smo se osredotočili na rešitve ERP na splošno, torej opredelili njihove značilnosti in določili najpogostejše module, medsebojno primerjali rešitve ERP, nameščene na lokaciji in v oblaku, opisali arhitekturno rešitev, predstavili ponudnike, njihove prednosti in slabosti ter trende, ki jih lahko pričakujemo v prihodnje. V nadaljevanju smo podrobneje opisali proces uvedbe rešitve ERP, kjer smo predstavili faze in življenjski cikel uvedbe, korake do uspešne uvedbe, metodologije vodenja projektov in pristope pri uvedbi rešitev ERP. V nadaljevanju magistrskega dela smo se osredotočili na kritične dejavnike uspeha. Ker vemo, da so rešitve ERP lahko nameščene na lokaciji ali v oblaku, smo preučili članke z obeh področij. Ker je računalništvo v oblaku razmeroma nova tehnologija, obstaja manj člankov na to temo, zato smo se osredotočili na zgolj enega, medtem ko smo za rešitve ERP, nameščene na lokaciji, preučili sedem člankov. Ker je na trgu mnogo ponudnikov rešitev ERP, smo na koncu magistrskega dela osredotočili na rešitev Business Central. V tem delu smo podrobneje opisali značilnosti rešitve Business Central, njene module in arhitekturo ter proces uvedbe s pomočjo metodologije Sure Step, prav tako smo ugotovili, kateri so kritični dejavniki uspeha, ki pozitivno vplivajo na uspešnost uvedbe rešitev ERP na splošno kot tudi na uspešnost specifične rešitve ERP Business Central.
Ključne besede: rešitve ERP, Business Central, kritični dejavniki uspeha, KDU, Microsoft Dynamics, Dynamics 365
Objavljeno v DKUM: 25.10.2023; Ogledov: 180; Prenosov: 13
.pdf Celotno besedilo (2,03 MB)

5.
Delovanje erp rešitev v računalniškem oblaku
Nina Margon, 2013, diplomsko delo

Opis: V 21. stoletju je tehnološki napredek dosegel že zelo veliko. Pojavljati so se začeli vedno novi in novi trendi, ki silijo podjetja k spreminjanju in posodabljanju svojega poslovanja in k novim trendom, ki jih narekuje trg. Podjetja, ki se slabo prilagajajo razmeram na trgu, so običajno tista, ki ne preživijo in jih pokoplje konkurenca. Ravno iz tega razloga je potrebno, predvsem za podjetja, spremljati trg na katerem se nahajajo in se mu prilagajati, zaznati spremembe in jih čim prej odpraviti, da podjetje lahko nemoteno posluje naprej ter jih konkurenca ne prehiti.
Ključne besede: Računalništvo v oblaku, ERP rešitve, Cloud Computing, SAP, Microsoft Dynamics NAV
Objavljeno v DKUM: 18.10.2023; Ogledov: 219; Prenosov: 5
.pdf Celotno besedilo (7,46 MB)

6.
Fluctuating number of energy levels in mixed-type lemon billiards
Črt Lozej, Dragan Lukman, Marko Robnik, 2021, izvirni znanstveni članek

Opis: In this paper, the fluctuation properties of the number of energy levels (mode fluctuation) are studied in the mixed-type lemon billiards at high lying energies. The boundary of the lemon billiards is defined by the intersection of two circles of equal unit radius with the distance 2B between the centers, as introduced by Heller and Tomsovic. In this paper, the case of two billiards, defined by B = 0.1953, 0.083, is studied. It is shown that the fluctuation of the number of energy levels follows the Gaussian distribution quite accurately, even though the relative fraction of the chaotic part of the phase space is only 0.28 and 0.16, respectively. The theoretical description of spectral fluctuations in the Berry-Robnik picture is discussed. Also, the (golden mean) integrable rectangular billiard is studied and an almost Gaussian distribution is obtained, in contrast to theory expectations. However, the variance as a function of energy, E, behaves as - E, in agreement with the theoretical prediction by Steiner.
Ključne besede: nonlinear dynamics, quantum chaos, mixed-type systems, energy level statistics, lemon billiards, billiards
Objavljeno v DKUM: 13.10.2023; Ogledov: 294; Prenosov: 8
.pdf Celotno besedilo (1,40 MB)
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7.
Quantum chaos in triangular billiards
Črt Lozej, Giulio Casati, Tomaž Prosen, 2022, izvirni znanstveni članek

Opis: We present an extensive numerical study of spectral statistics and eigenfunctions of quantized triangular billiards. We compute two million consecutive eigenvalues for six representative cases of triangular billiards, three with generic angles with irrational ratios with π, whose classical dynamics is presumably mixing, and three with exactly one angle rational with π, which are presumably only weakly mixing or even nonergodic in case of right triangles. We find excellent agreement of short- and long-range spectral statistics with the Gaussian orthogonal ensemble of random matrix theory for the most irrational generic triangle, while the other cases show small but significant deviations which are attributed either to a scarring or superscarring mechanism. This result, which extends the quantum chaos conjecture to systems with dynamical mixing in the absence of hard (Lyapunov) chaos, has been corroborated by analyzing distributions of phase-space localization measures of eigenstates and inspecting the structure of characteristic typical and atypical eigenfunctions.
Ključne besede: quantum physics, quantum chaos, quantum scars, wave chaos, billiards, chaos and nonlinear dynamics, ergodic theory
Objavljeno v DKUM: 12.10.2023; Ogledov: 121; Prenosov: 24
.pdf Celotno besedilo (11,21 MB)
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8.
Primernost uporabe erp rešitve microsoft dynamics nav v izbranem malem podjetju
Dana Obretan, 2023, diplomsko delo

Opis: ERP rešitve so postale v zadnjih letih poslovanja podjetij vitalni del poslovanja. Cilj informacijske rešitve je »posredovati prave informacije ob pravem času na pravo mestu s čim nižjimi stroški«. Informacijske rešitve danes uporablja večino malih, srednjih in velikih podjetij. Čeprav so mala podjetja bolj enostavna in manj kompleksna, pa še ne pomeni, da so vse ERP rešitve zanje primerne. Ena izmed primernih ERP rešitev za mala podjetja je Microsoft Dynamics NAV, ki je namenjen malim in srednje velikim podjetjem. Ta pomaga avtomatizirati in povezati prodajo, nabavo, računovodstvo, proizvodnjo in upravljanje zalog. Pokriva vse procese od financ, nabave, vodenja, skladiščenja, poroči in analiz. Ker je prilagodljiv, ga je mogoče prilagoditi potrebam in panogi podjetja. Naredili smo raziskavo informacijskih potreb malega podjetja, malih podjetij nasploh ter ponudbo Microsoft Dynamics NAV. Ugotovili smo, da Microsoft Dynamics NAV ne more zadovoljevati vsem informacijskim potrebam podjetja, ampak večino kriterijev vseeno zadovoljuje in je posledično primeren tako za mala podjetja kot tudi za mala podjetja z razvitim proizvodnim programom. Seveda pa zadovoljeni kriteriji niso dovolj dober pogoj za izbiro informacijske rešitve. Ker se informacijskih rešitev v podjetju ne zamenja na vsakih nekaj let, je potrebno ugotoviti, ali tudi videz informacijske rešitve, strokovna podpora, cena in drugi faktorji ustrezajo podjetju in uporabnikom rešitve.
Ključne besede: ERP rešitev, informacijska rešitev, Microsoft Dynamics NAV
Objavljeno v DKUM: 04.10.2023; Ogledov: 375; Prenosov: 12
.pdf Celotno besedilo (1,17 MB)

9.
The benefits, costs and feasibility of a low incidence COVID-19 strategy
Thomas Czypionka, Emil Nafis Iftekhar, Barbara Prainsack, Viola Priesemann, Simon Bauer, André Calero Valdez, Sarah Cuschieri, Enrico Glaab, Eva Grill, Jenny Krutzinna, Christos Lionis, Helena Machado, Carlos Martins, George N Pavlakis, Matjaž Perc, Elena Petelos, Martyn Pickersgill, Alexander Skupin, Eva S. Schernhammer, Ewa Szczurek, Sotirios Tsiodras, Peter Willeit, Paul Wilmes, 2022, izvirni znanstveni članek

Opis: In the summer of 2021, European governments removed most NPIs after experiencing prolonged second and third waves of the COVID-19 pandemic. Most countries failed to achieve immunization rates high enough to avoid resurgence of the virus. Public health strategies for autumn and winter 2021 have ranged from countries aiming at low incidence by re-introducing NPIs to accepting high incidence levels. However, such high incidence strategies almost certainly lead to the very consequences that they seek to avoid: restrictions that harm people and economies. At high incidence, the important pandemic containment measure ‘test-trace-isolate-support’ becomes inefficient. At that point, the spread of SARS-CoV-2 and its numerous harmful consequences can likely only be controlled through restrictions. We argue that all European countries need to pursue a low incidence strategy in a coordinated manner. Such an endeavour can only be successful if it is built on open communication and trust.
Ključne besede: disease dynamics, exponential growth, virality, strategy
Objavljeno v DKUM: 25.09.2023; Ogledov: 394; Prenosov: 17
.pdf Celotno besedilo (495,32 KB)
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10.
Advances in monitoring and understanding the dynamics of suspended-sediment transport in the river Drava, Slovenia: an analysis more than a decade-long
Janja Kramer Stajnko, Renata Jecl, Matjaž P. Nekrep, 2023, izvirni znanstveni članek

Opis: Managing sediment transport in streams is crucial to the surface water resource development strategy and has several implications for flood risk and water management, hydropower use, and balancing river morphology. This paper summarises the movement and behaviour of suspended sediment within the Slovenian portion of the River Drava, covering a span of thirteen years from 2005 to 2018. An analysis of relevant data collected during this period is also presented. Suspended-sediment dynamics strongly depend on flow velocity, seasonal variations in sediment sources, and human interventions in the riverbed. The transportation of material in the River Drava results in the accumulation of sediments in reservoirs and riverbeds, consequently impeding the natural hydrological cycle by reducing the outflow into aquifers. The 2018 high-water event is analysed in terms of the dependence of concentration of suspended sediments on discharge, where counterclockwise hysteresis was observed, providing an essential clue to the origin of sediment. Sediments from the River Drava in Slovenia are managed with some conventional processes and are mainly deposited or reintegrated into rivers and aquatic ecosystems. Some additional sediment management strategies with long-term solutions for efficient and comprehensive water management, hydropower, and ecological problems are proposed.
Ključne besede: sediment transport, streams, suspended sediment dynamics, suspended sediment transport, river Drava, sediment management, monitoring, water management
Objavljeno v DKUM: 13.09.2023; Ogledov: 313; Prenosov: 17
.pdf Celotno besedilo (4,52 MB)
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