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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, original scientific article

Abstract: 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.
Keywords: thermal treatment of waste, wastewater treatment, hydrothermal carbonisation
Published in DKUM: 18.04.2024; Views: 11; Downloads: 0
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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, professional article

Abstract: 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.
Keywords: Energy efficiency, Ecology, Innovation, Economy, waste-water treatment, constructed wetlands, green-house gas emissions, EU
Published in DKUM: 15.11.2023; Views: 247; Downloads: 4
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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, review article

Abstract: 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.
Keywords: automotive converters, catalytic converters, emissions reduction, exhaust gas post-treatment, catalyst deactivation, oxygen storage, numerical models
Published in DKUM: 06.09.2023; Views: 295; Downloads: 23
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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, short scientific article

Keywords: 2D speckle-tracking, strain, hypertrophic cardiomyopathy, early treatment, children
Published in DKUM: 24.01.2023; Views: 355; Downloads: 39
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Evaluation of successful treatment of patients with unilateral functional crossbite
Anita Fekonja, Jasmina Šijanec Kebrič, 2021, original scientific article

Abstract: 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.
Keywords: Unilateral functional crossbite, facial asymmetry, orthodontic treatment, Fränkel functional regulator, 616.31
Published in DKUM: 22.01.2023; Views: 380; Downloads: 47
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Catheter-directed thrombolytic therapy for lower-extremity deep vein thrombosis: a case report
Aja Pajnik Snoj, Andrej Markota, 2022, short scientific article

Keywords: catheter-directed thrombolysis, deep vein thrombosis, percutaneous interventional treatment, phlegmasia cerulea dolens
Published in DKUM: 17.01.2023; Views: 434; Downloads: 35
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Hemorrhagic stroke in children: a case report
Tanja Dukić Vuković, Mirjana Miksić, Tomaž Šeruga, Janez Ravnik, 2022, short scientific article

Keywords: hemorrhagic stroke, arteriovenous malformation, treatment
Published in DKUM: 17.01.2023; Views: 465; Downloads: 42
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Preparation of Three Dimensional Structures of Polysaccharide Derivatives for Application in Regenerative Medicine : doctoral disertation
Andreja Dobaj-Štiglic, 2022, doctoral dissertation

Abstract: Biocompatible polysaccharide scaffolds with controllable pore size, good mechanical properties, and no hazardous chemical crosslinkers are desirable for long-term tissue engineering applications. Despite decades of development of novel scaffolds, there are still many challenges to be solved regarding their production and optimization for specifically engineered tissues. Herein, we have fabricated several three-dimensional (3D) scaffolds using polysaccharide or polysaccharide-protein composite hydrogels or inks for 3D printing, featuring strong shear thinning behavior and adequate printability. The inks, composed of various combinations of chitosan, nanofibrillated cellulose, carboxymethyl cellulose, collagen, and citric acid, were 3D printed, freeze-dried, and dehydrothermally heat-treated to obtain dimensionally and mechanically stable scaffolds. The heat-assisted step induced the formation of covalent amide and ester bonds between the functional groups of chosen polysaccharides and protein collagen. Citric acid was chosen as a non-hazardous and „green” crosslinker to further tailor the mechanical properties and long-term stability of the scaffolds. We have investigated how the complexation conditions, charge ratio, dehydrothermal treatment, and degree of crosslinking influence the scaffolds' chemical, surface, swelling, and degradation properties in the dry and hydrated states. The compressive strength, elastic modulus, dimensional stability and shape recovery of the (crosslinked) scaffolds increased significantly with balanced charge ratio, dehydrothermal treatment, and increased concentrations of citric acid crosslinker and collagen concentrations. The prepared crosslinked scaffolds promoted (clustered) cell adhesion and showed no cytotoxic effects, as determined by cell viability assays and live/dead staining with human bone tissue-derived osteoblasts and human adipose tissue-derived mesenchymal stem cells. The water-based and non-hazardous crosslinking methods presented here can be extended to all polysaccharide- or polysaccharide-protein-based materials to develop cell-friendly scaffolds with tailored properties suitable for various tissue engineering applications.
Keywords: chitosan, carboxymethyl cellulose, nanofibrillated cellulose, citric acid, collagen, freeze drying, 3D printing, dehydrothermal treatment
Published in DKUM: 11.10.2022; Views: 535; Downloads: 145
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