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ǂThe ǂcorrosion resistance of dental Ti6Al4V with differing microstructures in oral environments
Mirjam Bajt Leban, Tadeja Kosec, Matjaž Finšgar, 2023, izvirni znanstveni članek

Opis: The impact of the microstructural properties of a Ti6Al4V alloy on its electrochemical properties, as well as the effect of the α- and β-phases present within it, is still unclear. With the introduction of new, emerging technologies, such as selective laser melting and post heat treatments, the effect of the microstructure on an alloy's corrosion properties has become increasingly interesting from a scientific perspective. When these alloys are produced through different methods, despite an identical chemical composition they have diverse microstructures, and consequently display varying resistance to corrosion. In the present research study, Ti–6Al–4V alloy specimens produced by three different processes, leading to the formation of three different microstructures were investigated: heat treated specimen fabricated by selective laser melting, wrought and cast specimens. The impact of the microstructure of these alloys when immersed in artificial saliva was studied through the use of various electrochemical techniques, by microscopical examinations, and time-of-flight secondary ion mass spectrometry. Corrosion properties were investigated by the measurement of open circuit potential, linear polarization, and potentiodynamic curve measurements followed by microscopical examinations, and time-of-flight secondary ion mass spectrometry examination was conducted to reveal spatial distribution of alloying species on oxide film. It was found that the difference between specimens containing an α+β microstructure was small and not dependent on the aspect ratio of the β-phase, alloy grain size, and vanadium partitioning coefficient, but rather on the size, shape, and content of this phase.
Ključne besede: Ti6Al4V, dental alloy, microstructure, corrosion resistance, heat treatment, ToF-SIMS
Objavljeno v DKUM: 07.05.2024; Ogledov: 48; Prenosov: 2
.pdf Celotno besedilo (8,12 MB)
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3.
Thermal treatment of raw and pre-treated wastes from the paper industry
Aleksandra Petrovič, Christoph Hochenauer, Matej Zazijal, Lidija Čuček, Darko Goričanec, Danijela Urbancl, 2023, izvirni znanstveni članek

Opis: In this study, the thermal treatment of two types of waste from the paper industry was investigated, paper mill sludge and sewage sludge from biological wastewater treatment plants. Hydrothermal carbonisation (HTC) and torrefaction were investigated as sustainable alternatives for solid biofuel production. Untreated samples and samples chemically pre-treated with alcoholic vinegar were subjected to torrefaction at 350 °C in N2 atmosphere, and the exhaust gases were analysed. HTC was performed at 250 °C with a residence time of 4 h. The feedstocks and the biochars produced were characterised by different analytical methods, and the effects of pre-treatment on fuel properties were studied. Both processes, HTC and torrefaction, showed inspiring results in the production of biofuels from paper industry wastes under the tested experimental conditions. A positive influence of pre-treatment on fuel properties (higher heating value, carbon content) of the obtained char was observed, and changes in the gas phase during torrefaction were observed.
Ključne besede: thermal treatment of waste, wastewater treatment, hydrothermal carbonisation
Objavljeno v DKUM: 18.04.2024; Ogledov: 89; Prenosov: 0
.pdf Celotno besedilo (1,15 MB)
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Improving decentralized economic growth and reducing energy consumption in the European Union with the application of ecologically oriented innovations
Niko Natek, Boštjan Krajnc, 2020, strokovni članek

Opis: This article presents applicable approaches for supporting the transition towards sustainable decentralized economic development within the European Union, based on the concept of supporting the development and market uptake of eco-innovations. The main topic addressed is achieving a more effective market uptake of ecologically oriented innovations facilitated through matchmaking, as well as knowledge and technology transfer between key actors of the innovation process.
Ključne besede: Energy efficiency, Ecology, Innovation, Economy, waste-water treatment, constructed wetlands, green-house gas emissions, EU
Objavljeno v DKUM: 15.11.2023; Ogledov: 307; Prenosov: 4
.pdf Celotno besedilo (803,56 KB)
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6.
Recent advances in the development of automotive catalytic converters: a systematic review
Laura Robles-Lorite, Ruben Dorado Vicente, Eloisa Torres Jiménez, Gorazd Bombek, Luka Lešnik, 2023, pregledni znanstveni članek

Opis: Despite the current boost in the use of electric vehicles to reduce the automotive sector’s footprint, combustion vehicles are and will be present in our cities in both the immediate and long term. In this sense, catalytic converters, which are exhaust gas post-treatment systems for vehicle emission control, are critical for complying with increasingly stringent environmental regulations. This work proposes a systematic review to identify the most relevant knowledge regarding the parameters (materials, geometries, and engine conditions), conditions (cold start, oxygen storage, and deactivation), and mathematical models to consider in the design of catalytic converters. The Scopus database contains 283 records related to this review’s objective. After applying the inclusion and exclusion criteria, 65 reports were retrieved for evaluation. A table was created to present the results and prepare this manuscript. The evaluation revealed that the following topics were active: the study of non-noble catalyst materials, as well as new substrate materials and geometries, for designing more compact and cost-effective catalytic converters; the development of strategies to improve conversion during cold starts; and the development of accurate and fast estimation models.
Ključne besede: automotive converters, catalytic converters, emissions reduction, exhaust gas post-treatment, catalyst deactivation, oxygen storage, numerical models
Objavljeno v DKUM: 06.09.2023; Ogledov: 322; Prenosov: 23
.pdf Celotno besedilo (532,89 KB)
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Strain indicators in the assessment of systolic myocardial function in aboy [!] with hypertrophic cardiomyopathy : a case report
Nadezhda Chernykh, Alla Tarasova, Olga Groznova, 2020, drugi znanstveni članki

Ključne besede: 2D speckle-tracking, strain, hypertrophic cardiomyopathy, early treatment, children
Objavljeno v DKUM: 24.01.2023; Ogledov: 368; Prenosov: 40
.pdf Celotno besedilo (121,67 KB)
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8.
Evaluation of successful treatment of patients with unilateral functional crossbite
Anita Fekonja, Jasmina Šijanec Kebrič, 2021, izvirni znanstveni članek

Opis: Unilateral functional crossbite (UFCB) is one of the most common malocclusions in the deciduous and early mixed dentition stage. It is accompanied by lateral mandibular shift and mandibular midline deviation due to the narrow maxillary dental arch. The aim of this study was to assess the effects of early correction of UFCB with the Fränkel (FR–3) functional regulator.
Ključne besede: Unilateral functional crossbite, facial asymmetry, orthodontic treatment, Fränkel functional regulator, 616.31
Objavljeno v DKUM: 22.01.2023; Ogledov: 423; Prenosov: 47
.pdf Celotno besedilo (999,54 KB)
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