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Hybrid polylactic-acid–pectin aerogels : synthesis, structural properties, and drug release
Gabrijela Horvat, Klara Žvab, Željko Knez, Zoran Novak, 2023, izvirni znanstveni članek

Opis: Wound-dressing materials often include other materials stimulating wound healing. This research describes the first formulation of biodegradable hybrid aerogels composed of polylactic acid and pectin. The prepared hybrid material showed a highly porous structure with a surface area of 166 +/- 22.6 m(2)center dot g(-1). The addition of polylactic acid may have decreased the surface area of the pure pectin aerogel, but it improved the stability of the material in simulated body fluid (SBF). The pure pectin aerogel showed a high swelling and degradation ratio after 3 h. The addition of the polylactic acid prolonged its stability in the simulated body fluid from 24 h to more than one week, depending on the amount of polylactic acid. Biodegradable aerogels were loaded with indomethacin and diclofenac sodium as model drugs. The entrapment efficiencies were 63.4% and 62.6% for indomethacin and diclofenac sodium, respectively. Dissolution of both drugs was prolonged up to 2 days. Finally, sodium percarbonate and calcium peroxide were incorporated into the bioaerogels as chemical oxygen sources, to evaluate oxygen generation for potential wound healing applications.
Ključne besede: hybrid aerogels, bioaerogel, pectin, polylactic acid, wound healing
Objavljeno v DKUM: 20.02.2024; Ogledov: 59; Prenosov: 0
.pdf Celotno besedilo (2,62 MB)
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Privacy and data protection concerns in the regulatory framework of Slovenian energy law
Zoran Dimović, 2023, izvirni znanstveni članek

Opis: The implementation of smart energy systems (SES) in the Slovenian energy sector has raised significant privacy and data protection concerns. The collection and processing of personal data from energy consumers, as well as cybersecurity threats, pose risks that must be addressed. The legal framework governing privacy and data protection in the energy field in Slovenia is based on the GDPR, ZOEE, ZVPot-1, ZVOP-2 and others, which impose significant obligations on entities processing personal data. To mitigate these risks, exact terminology must be used to implement privacy, data protection and also cybersecurity measures and ensure compliance with the legal framework.
Ključne besede: cybersecurity, data protection, energy law, green and digital transformation, privacy protection
Objavljeno v DKUM: 20.02.2024; Ogledov: 54; Prenosov: 0
.pdf Celotno besedilo (456,29 KB)
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Dynamic characterisation of novel three-dimensional axisymmetric chiral auxetic structure
Anja Mauko, Yunus Emre Yilmaz, Nejc Novak, Tomáš Doktor, Matej Vesenjak, Zoran Ren, 2024, izvirni znanstveni članek

Opis: The study presents an extensive mechanical and computational characterisation of novel cellular metamaterial with axisymmetric chiral structure (ACS) at different strain rates. The Direct Impact Hopkinson Bar (DIHB) testing device was used for impact testing up to 21 m/s striker speed, which was insufficient to reach the shock deformation regime. Thus, using computational simulations to estimate the structure behaviour at high strain rates was necessary. Experimental and computational results showed that all ACS structures exhibit a nominal stress–strain relationship typical for cellular materials. As the loading conditions shifted to a dynamic regime, the micro–inertia effect became increasingly pronounced, leading to a corresponding rise in structure stiffness. The Poisson's ratio in all ACS increases gradually, making them superior to traditional cellular materials, which experience a sudden increase in Poisson's ratio during loading. Additionally, the study found that the structures exhibited a rise in the auxetic effect with an increase in strain rate, highlighting the benefits of axisymmetric structures in high-loading regimes. Overall, the obtained results provide valuable insights into the mechanical properties of ACS under different loading regimes and will contribute to further design improvements and the fabrication of novel ACS metamaterials.
Ključne besede: axisymmetric chiral structure, auxetic, chiral unit cell, impact testing, dynamic characterisation, finite element simulations
Objavljeno v DKUM: 15.02.2024; Ogledov: 50; Prenosov: 4
.htm Celotno besedilo (164,25 KB)
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HPC innovation for European SMES : H2020-JTI-EuroHPC-2019-2
Janez Langus, Jure Pocrnjič, Janez Langus, Zoran Ren, Miran Ulbin, Matej Borovinšek, Nejc Novak, Anja Mauko, končno poročilo o rezultatih raziskav

Objavljeno v DKUM: 12.02.2024; Ogledov: 78; Prenosov: 2
.pdf Celotno besedilo (935,94 KB)

Modelling of fatigue microfracture in porous sintered steel using a phase-field method
Zoran Tomić, Tomislav Jarak, Tomislav Lesičar, Nenad Gubeljak, Zdenko Tonković, 2023, izvirni znanstveni članek

Opis: Porosity in sintered materials negatively affects its fatigue properties. In investigating its influence, the application of numerical simulations reduces experimental testing, but they are computationally very expensive. In this work, the application of a relatively simple numerical phase-field (PF) model for fatigue fracture is proposed for estimation of the fatigue life of sintered steels by analysis of microcrack evolution. A model for brittle fracture and a new cycle skipping algorithm are used to reduce computational costs. A multiphase sintered steel, consisting of bainite and ferrite, is examined. Detailed finite element models of the microstructure are generated from high-resolution metallography images. Microstructural elastic material parameters are obtained using instrumented indentation, while fracture model parameters are estimated from experimental S–N curves. Numerical results obtained for monotonous and fatigue fracture are compared with data from experimental measurements. The proposed methodology is able to capture some important fracture phenomena in the considered material, such as the initiation of the first damage in the microstructure, the forming of larger cracks at the macroscopic level, and the total life in a high cycle fatigue regime. However, due to the adopted simplifications, the model is not suitable for predicting accurate and realistic crack patterns of microcracks.
Ključne besede: sintered steel, microcracks, fatigue, phase-field method, porosity
Objavljeno v DKUM: 09.02.2024; Ogledov: 88; Prenosov: 7
.pdf Celotno besedilo (8,81 MB)
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Green Processing of Neat Poly(lactic acid) Using Carbon Dioxide under Elevated Pressure for Preparation of Advanced Materials : A Review (2012–2022)
Stoja L. Milovanović, Ivana Lukic, Gabrijela Horvat, Zoran Novak, Sulamith Frerich, Marcus Petermann, Carlos A. García-González, 2023, pregledni znanstveni članek

Opis: This review provides a concise overview of up-to-date developments in the processing of neat poly(lactic acid) (PLA), improvement in its properties, and preparation of advanced materials using a green medium (CO2 under elevated pressure). Pressurized CO2 in the dense and supercritical state is a superior alternative medium to organic solvents, as it is easily available, fully recyclable, has easily tunable properties, and can be completely removed from the final material without post-processing steps. This review summarizes the state of the art on PLA drying, impregnation, foaming, and particle generation by the employment of dense and supercritical CO2 for the development of new materials. An analysis of the effect of processing methods on the final material properties was focused on neat PLA and PLA with an addition of natural bioactive components. It was demonstrated that CO2-assisted processes enable the control of PLA properties, reduce operating times, and require less energy compared to conventional ones. The described environmentally friendly processing techniques and the versatility of PLA were employed for the preparation of foams, aerogels, scaffolds, microparticles, and nanoparticles, as well as bioactive materials. These PLA-based materials can find application in tissue engineering, drug delivery, active food packaging, compostable packaging, wastewater treatment, or thermal insulation, among others.
Ključne besede: aerogels, drying, foaming, impregnation, particle generation, PLA
Objavljeno v DKUM: 06.02.2024; Ogledov: 82; Prenosov: 4
.pdf Celotno besedilo (5,02 MB)
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Vizualizacija na gradbišču s pomočjo BIM in razširjene resničnosti : magistrsko delo
Kaja Pevec, 2024, magistrsko delo

Opis: V zadnjem letu je veliko govora o BIM pristopu v gradbeništvu v Sloveniji, saj bo ta kmalu zakonsko obvezen (po GZ-1) za vse projekte financirane z javnimi sredstvi, in sicer od 1. januarja 2025. V tujini, v posameznih državah, je BIM pristop že nekaj let v stalni uporabi v praksi, zaradi boljšega razumevanja in upravljanja gradbenih procesov. Pri nas pa smo se začeli zavedati pomena in prednosti BIM pristopa v zadnjih nekaj letih, predvsem zaradi mednarodnih smernic, evropskih projektov in strategij ter vedno večjega poudarka na digitalizaciji. Vedno večji pomen na gradbišču ima tudi razširjena resničnost (extended reality), ki zajema VR (virtual reality), AR (augmented reality) in MR (mixed reality), saj predvsem slednji dve omogoča interaktivno vizualizacijo na gradbiščih, kar vpliva na izboljšanje produktivnosti, kakovosti in varnosti gradbenih projektov. V magistrskem delu smo za vizualno spremljanje skladnosti načrtov oziroma BIM modela z dejanskim stanjem na gradbišču uporabili čelado Trimble XR10 z vizirjem HoloLens 2, ki sta jo razvili podjetji Trimble in Microsoft za gradbeno industrijo. Primerjali smo tudi prednosti in slabosti tradicionalnega pristopa v primerjavi z naprednim pristopom, ki vključuje uporabo BIM in MR.
Ključne besede: gradbeništvo, vizualizacija, BIM pristop, razširjena resničnost, gradbišče
Objavljeno v DKUM: 30.01.2024; Ogledov: 105; Prenosov: 24
.pdf Celotno besedilo (6,05 MB)

Spremljanje gradnje s pomočjo 4D in 5D informacijskega modela : magistrsko delo
Matic Bračič, 2024, magistrsko delo

Opis: V sodobni gradbeni industriji je uporaba informacijskega modeliranja gradenj (Building Information Modeling - BIM) postala ključnega pomena za učinkovito načrtovanje, izvedbo in upravljanje gradbenih projektov. BIM je digitalni pristop, ki omogoča ustvarjanje celovitega in interaktivnega BIM modela objekta, v katerem so vse informacije in podatki o gradbenem projektu združeni na enem mestu. S tem omogoča celovit pogled na projekt, povečuje sodelovanje med deležniki in optimizira procese v gradbeni industriji. V magistrskem delu bomo s pomočjo programske opreme Bexel Manager izdelali 4D in 5D BIM model gradbenega projekta Center Rotovž sklop knjižnica. Ustvarjeni bodo 4D (geometrijski in časovni podatki) in 5D (geometrijski in stroškovni podatki) BIM modeli, ki omogočajo boljše razumevanje in upravljanje projekta. Cilj raziskave je ovrednotiti prednosti uporabe BIM modela za vodenje gradbenih projektov. S pomočjo praktičnega primera gradbenega projekta bomo analizirali, kako BIM pristop izboljšuje natančnost, učinkovitost in ekonomičnost vodenja gradbenih projektov.
Ključne besede: gradbeništvo, BIM pristop, spremljanje gradnje, digitalizacija, Bexel Manager
Objavljeno v DKUM: 29.01.2024; Ogledov: 161; Prenosov: 19
.pdf Celotno besedilo (4,46 MB)

Barbara Pavlakovič, Marko Koščak, Zoran Ožbolt, Vladimir Čeligoj, 2021, predgovor, uvodnik, spremna beseda

Objavljeno v DKUM: 24.01.2024; Ogledov: 42; Prenosov: 2
.pdf Celotno besedilo (103,35 MB)
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Načrtovanje sistema centralnega ogrevanja hiše : diplomsko delo
Zoran Popović, 2023, diplomsko delo

Opis: Učinkovita raba energije je izjemno pomembna za zmanjševanje energetskih potreb v stavbah in ključna v boju proti podnebnim spremembam, pri trajnostnem razvoju ter prehodu v nizkoogljično družbo. V diplomski nalogi so predstavljene različne vrste sistemov centralnega ogrevanja, opisane so njihove značilnosti ter osnovne komponente. Praktični del diplomske naloge zajema zasnovo sodobne stanovanjske hiše in načrtovanje energetsko učinkovitega sistema centralnega ogrevanja z lesno biomaso. V praktičnem delu naloge je vsebina osredotočena na analizo energetske učinkovitosti, določitev potrebne toplote za ogrevanje ter izračun projektne toplotne moči s pomočjo programskih orodij KI Energija in Audytor 7.0 PRO. Pridobljeni rezultati izvedenih analiz bodo ključni za sam postopek načrtovanja sistema centralnega ogrevanja. Usklajenost teoretičnih konceptov in praktičnega izvajanja omogoča celovit vpogled v proces načrtovanja ter obravnavo ekonomskih in energetskih vidikov sistema centralnega ogrevanja.
Ključne besede: energetska učinkovitost, sistemi centralnega ogrevanja, načrtovanje, KI Energija, Audytor HL
Objavljeno v DKUM: 18.01.2024; Ogledov: 101; Prenosov: 11
.pdf Celotno besedilo (4,26 MB)

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