1. Zgodnja mobilizacija in okrevanje pacientov po operacijah s področja abdominalne kururgijeJure Horvat, 2025, undergraduate thesis Abstract: Uvod: Operacije s področja abdominalne kirurgije so zaradi napredka tehnologije in zdravstvene oskrbe vse pogostejše. Kljub temu pa so zapleti po večjih abdominalnih posegih še vedno pogosti, v razponu od 30 % do 60 %. Zgodnja pooperativna mobilizacija, kot ključni del protokolov ERAS, dokazano zmanjšuje zaplete in pospešuje okrevanje. Kljub uveljavljenim smernicam še vedno primanjkuje strukturiranih protokolov za spremljanje in izvajanje zgodnje mobilizacije. Namen zaključnega dela je analizirati vpliv zgodnje mobilizacije na okrevanje pacientov po operacijah s področja abdominalne kirurgije.
Metode: Izveden je bil pregled literature z uporabo metode analize, kompilacije, komparacije in sinteze. Viri so bili iskani v podatkovnih bazah PubMed, CINAHL Ultimate, ScienceDirect in Cochrane Library. Potek iskanja je prikazan s PRISMA diagramom, glavne ugotovitve pa so bile pridobljene s vsebinsko analizo.
Rezultati: Identificiranih je bilo 74 člankov, v podrobno analizo pa je bilo vključenih šest raziskav. Rezultati so pokazali, da zgodnja mobilizacija skrajša hospitalizacijo, izboljša oksigenacijo, spanec, zadovoljstvo pacientov in zmanjša utrujenost.
Razprava in zaključek: Zgodnja mobilizacija ima pomemben potencial za izboljšanje zdravstvene oskrbe. Vključene raziskave so potrdile pozitivne fiziološke in funkcionalne učinke zgodnje mobilizacije, vendar različni pristopi raziskav otežujejo neposredno primerjavo rezultatov. Več raziskav je potrebnih za oceno dolgoročnih koristi in morebitnih tveganj.
Keywords: zgodnja mobilizacija, okrevanje, pacienti, abdominalna kirurgija
Published in DKUM: 27.06.2025; Views: 0; Downloads: 13
 Full text (1,27 MB) |
2. Poučevanje predmeta šport z vidika kompetenc razrednih učiteljevJurij Planinšec, Črtomir Matejek, 2020, original scientific article Abstract: Namen raziskave je bil ugotoviti, ali se učitelji razrednega pouka čutijo dovolj kompetentne za izvajanje predmeta šport ter kako je kompetentnost povezana z delovno dobo in športno dejavnostjo učiteljev. Raziskava je temeljila na neslučajnostnem namenskem vzorcu 220 učiteljev razrednega pouka. Rezultati kažejo, da učitelji razrednega pouka najvišje vrednotijo kompetence, ki se nanašajo na načrtovanje, organizacijo, izvedbo in evalvacijo pouka športa. Manj kompetentne se čutijo predvsem, ko gre za vključevanje otrok s posebnimi potrebami v športno vadbo. Športno najbolj dejavni učitelji in tisti z najdaljšo delovno dobo kompetence ocenjujejo višje kot manj športno dejavni učitelji in tisti z manj delovne dobe.
Keywords: športna vzgoja, učitelji, strokovno usposabljanje, profesionalni razvoj, razredni pouk, razredni učitelji, predmetno specifične kompetence
Published in DKUM: 26.06.2025; Views: 0; Downloads: 3
Full text (254,19 KB)
This document has many files! More... |
3. A coupled multilevel vial lyophilization model for the pressure coupling in a freeze dryerBlaž Kamenik, Jure Ravnik, Timi Gomboc, Matej Zadravec, Matjaž Hriberšek, 2025, original scientific article Abstract: With computational modeling of lyophilization in vials, the pressure coupling between the sublimation front and the drying chamber has traditionally been calculated using a simplified mass transfer resistance model in the form of a model, which takes into account the headspace and the stopper in a simplified way. In developing a 3D CFD-based digital twin of lyophilization in vials, a need arises for a mass flow rate-dependent vial headspace/stopper model, as it enables a more accurate calculation of the pressure conditions above the shelf as well as pressure conditions directly at the sublimation front, the latter directly affecting the sublimation mass transfer rate as well as the temperature inside the product, which is crucial for determining the risk of product collapse. The local pressure variations at a shelf level affect the heat transfer conditions due to heat conduction in the low pressure environment of the drying chamber. In the present work the development of a coupled multilevel vial lyophilization model for the freeze-drying of vials is reported, with the time-dependent 1D heat and mass transfer model at the vial level coupled with the time-dependent 3D low-pressure CFD model of the flow of the water vapor–air mixture in the drying chamber heated by the shelves. A direct pressure coupling between the sublimation front and the drying chamber space in form of vial type specific headspace/stopper resistance model is implemented. The developed multilevel lyophilization model is used to study the pressure build-up above the shelf and the headspace of the vial and its influence on the product temperature at the bottom of the vial using simulations carried out for different chamber pressures (6 Pa and 22 Pa), shelf temperatures (−20 oC and +10 oC) and vial types (10R and 15R). By implementing previously developed vial headspace/stopper pressure resistance models, the computational results show that the pressure build-up above the shelf and vial headspace significantly affect the product temperature at the bottom of the vial, especially at low chamber pressures ( Pa) and small gap sizes between the rubber stopper and the shelf above it. The increased pressure outside the vial leads also to higher heat transfer by conduction, which is particularly pronounced at the central shelf positions and within smaller shelf gaps. These results underline the importance of using a coupled multilevel model when analyzing the relationship between the local pressure variations above the shelf and their direct influence on product drying conditions, further improving the predictive capabilities of CFD based multilevel lyophilization models, especially with respect to detecting the product collapse temperature.
Keywords: freeze-drying, conjugate heat and mass transfer, computational fluid dynamics, multi-scale modeling
Published in DKUM: 17.06.2025; Views: 0; Downloads: 7
Full text (4,01 MB)
This document has many files! More... |
4. Advancing nanofluid numerical modelling: A novel Euler–Lagrange method with experimental validationNejc Vovk, Blaž Kamenik, Elif Begum Elcioglu, Erdem Ozyurt, Ziya Haktan Karadeniz, Alpaslan Turgut, Jure Ravnik, 2025, original scientific article Abstract: We present a novel approach to numerical modelling of thermal nanofluids based on the Euler–Lagrange method. This approach overcomes the challenge of extremely fine temporal discretization, which previous Euler–Lagrange nanofluid numerical models struggled to address, while also avoiding the need for too many Lagrangian nanoparticles. A numerical uncertainty assessment method is adapted for the proposed approach. The model is validated with a simple verification case and applied to simulate a closed natural circulation loop heat exchanger operating with heating power ranging from 10 W to 50 W and nanoparticle volume fractions of 0.5% to 2%, using an Al2O3–water nanofluid. Results are compared with experimental temperature measurements and an Euler–Euler implementation of the same nanofluid. The model is also applied to simulate the natural convection inside a vertical enclosure, studied experimentally by other authors. The proposed novel approach demonstrates agreement with both experimental data and the Euler–Euler implementation, effectively capturing the overall behaviour of nanofluids. We establish, that the interplay of multiple transport phenomena, that occur in nanofluid operated devices, can be difficult to completely reproduce numerically within the framework of current modelling assumptions.
Keywords: Euler–Lagrange nanofluid modelling, numerical uncertainty assessment, natural convection loop simulation, nanoparticle concentration analysis, nanofluid heat transfer
Published in DKUM: 17.06.2025; Views: 0; Downloads: 7
Full text (3,33 MB)
This document has many files! More... |
5. Primerjava športnih dejavnosti učencev iz Maribora in Novega SadaJasmina Jančič, Jurij Planinšec, 2018, original scientific article Abstract: Namen raziskave je bil ugotoviti, koliko in na kakšen način so športno dejavni učenci iz Maribora in Novega Sada ter ali obstaja razlika v športni dejavnosti učencev iz omenjenih mest. V raziskavo sta bila vključena 202 učenca 4., 5., 6. in 7. razredov osnovnih šol, in sicer 100 učencev iz Novega Sada ter 102 učenca iz Maribora; od tega je bilo 96 deklet in 106 fantov. Za zbiranje podatkov smo uporabili anketni vprašalnik, ki so ga učenci izpolnjevali v maternem jeziku. Dobljene podatke smo obdelali s programom SPSS 21, pri tem smo uporabili χ²-preizkus in t-preizkus. Rezultati kažejo, da obstajajo statistično pomembne razlike med učenci iz Maribora in učenci iz Novega Sada pri obiskovanju športnih interesnih dejavnosti v šoli, pri športnem udejstvovanju z družinskimi člani ter v neorganiziranih športnih dejavnostih. Pri obiskovanju organiziranih izvenšolskih športnih dejavnosti pa ni bilo statistično pomembne razlike. Sklenemo lahko, da so učenci iz Maribora v povprečju športno dejavnejši kot učenci iz Novega Sada.
Keywords: športna vzgoja, šolski šport, gibalna aktivnost, gibalna dejavnost, Slovenija, Srbija, učenci, osnovne šole
Published in DKUM: 04.06.2025; Views: 0; Downloads: 3
Full text (231,37 KB)
This document has many files! More... |
6. Ellipsoidal soft micro-particles suspended in dilute viscous flowJana Wedel, Matjaž Hriberšek, Jure Ravnik, Paul Steinmann, 2025, original scientific article Abstract: Soft particles in viscous flows are prevalent both in nature and in various industrial applications. Notable examples include biological cells such as blood cells and bacteria as well as hydrogels and vesicles. To model these intriguing particles, we present an extension of our recent, efficient, and versatile pseudo-rigid body approach, originally developed for initially spherical soft particles suspended in arbitrary macroscale viscous flows. The novel extension allows modeling the barycenter and shape dynamics of soft initially non-spherical, i.e. ellipsoidal particles by introducing a novel shape and orientation tensor. We consider soft, micrometer-sized, ellipsoidal particles deforming affinely. To this end, we combine affine deformations (as inherent to a pseudo-rigid body) and the Jeffery-Roscoe model to analytically determine the traction exerted on a soft ellipsoidal particle suspended locally in a creeping flow at the particle scale. Without loss of generality, we assume nonlinear hyperelastic material behavior for the particles considered. The novel extension of our recent numerical approach for soft particles demonstrates that the deformation and motion of the particles can be accurately reproduced also for ellipsoidal particles and captures results from the literature, however, at drastically reduced computational costs. Furthermore, we identify both the tumbling and trembling dynamic regime for soft ellipsoidal particles suspended in simple shear flow again capturing results from the literature. Our extended approach is first validated using experimental and numerical studies from the literature for quasi-rigid as well as soft particles, followed by a comparison of the effects of particle deformability for some well-known fluid flow cases, such as laminar pipe flow, lid-driven cavity flow, and a simplified bifurcation. We find that taking particle deformability into account leads to notable deviations in the particle trajectory compared to rigid particles, with increased deviations for higher initial particle aspect ratio. Furthermore, we demonstrate that our approach can track a statistically relevant number of soft particles in complex flow situations.
Keywords: soft particles, Lagrangian particle tracking, pseudo-rigid bodies, point-particle method
Published in DKUM: 19.05.2025; Views: 0; Downloads: 3
Full text (4,82 MB)
This document has many files! More... |
7. Razvoj in oblikovanje rekreacijskega vozila : diplomsko deloMatija Perš, 2025, undergraduate thesis Abstract: V diplomski nalogi je predstavljen razvoj in oblikovanje rekreacijskega vozila s poudarkom na optimizaciji notranje postavitve, stabilizacijskega sistema in električni samooskrbi. Razvili smo modularno notranjo opremo ki omogoča prilagodljivost in maksimalno izrabo prostora. Uporabili smo računalniško podprto konstruiranje(CAD) v programu Creo. Električni sistem temelji na Mastervolt inverterju, ki zagotavlja avtonomno napajanje. Rezultati kažejo, da vozilo ponuja visoko funkcionalnost in udobje za uporabnike, hkrati pa omogoča energetsko neodvisnost in stabilno uporabo na različnih terenih
Keywords: Rekreacijsko vozilo, razvoj, predelava
Published in DKUM: 08.05.2025; Views: 0; Downloads: 0 |
8. |
9. Rekonstrukcija mehanizma in optimizacija izkoristka replike : magistrsko deloJure Pajžlar, 2025, master's thesis Abstract: V magistrski nalogi je predstavljena raziskava trga podobnih airsoft replik z namenom določitve osnove za predelavo replike. Opisano je delovanje replike ter izbira posameznih komponent za nadgradnjo replike na želene parametre. Povzet je postopek izvedbe nadgradnje, prav tako pa je izvedena ekonomska analiza, ki določa končno ceno predelane replike. V okviru naloge je bil izveden eksperiment, ki je preučeval vpliv mase kroglic in dolžine cevi na izhodno kinetično energijo. Vpliv je bil potrjen z uporabo testiranja variacij parametrov. Na podlagi rezultatov meritev sta bili določeni optimalna masa kroglice in dolžina cevi za repliko, ki je predmet naloge.
Keywords: Airsoft replika, kinetična energija, rekonstrukcija, analiza, optimizacija
Published in DKUM: 24.04.2025; Views: 0; Downloads: 23
Full text (5,12 MB) |
10. Modeliranje prenosa sedimenta v akumulacijskem jezeru Melje : diplomsko deloPrimož Kranjc, 2024, undergraduate thesis Abstract: Nestanovitnost dežja pojasnjuje neenakomerno porazdelitev količine vodnih virov skozi vse leto. Z gradnjo jezov in akumulacijskih jezer želimo izravnati to ne enakomerno porazdelitev vodnih virov in s tem povečati zagotovljenost vode. Akumulacijska jezera se najpogosteje izkoriščajo kot skladišča pitne vode ali shrambo hidroelektrične energije. Takšen jez ne predstavlja ovire le vodi v reki ampak tudi sedimentu, ki ga reka prenaša dol vodno. Sediment se začne kopičiti v rezervoarju in s časom zniža kapaciteto shranjene vode v rezervoarju in s tem škodi glavni vlogi rezervoarja; shranjevanju vode. Sedimentacija je glavni problem vzdrževanja akumulacijskih jezer saj ga je treba redno odstranjevati. Odstranjevanje sedimenta iz akumulacijskega jezera ni enostavno, razmisliti moramo o tem kje ga bomo odstranili, v kolikšni količini (vsega ali le delno) in v kakšnih časovnih razmakih je odstranjevanje najbolj ekonomično. Diplomska naloga se navezuje na sedimentacijo v akumulacijskem jezeru Melje. Z izdelavo hidravličnega modela v programski opremi HEC-RAS ugotavljamo vpliv usedlin na tok v reki Dravi in oblikujemo smernice za odstranjevanja sedimenta v rezervoarju. Simulacije so pokazale, da se na tem območji najbolj splača prečrpavanje sedimenta v kanal. Potrebno bo dodatna študija za potrditev sklepa.
Keywords: prenos sedimenta, HEC-RAS, oblikovanje podatkov, 2D modeliranje toka, vzdrževanje akumulacijskega jezera
Published in DKUM: 11.04.2025; Views: 0; Downloads: 13
Full text (6,79 MB) |
