Iskanje po repozitoriju

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Ključne besede: Kozmos, konstruktivizem, ekspresionizem, kraška poetika, slovenska avantgarda
Objavljeno v DiRROS: 17.05.2026; Ogledov: 25; Prenosov: 10
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Povzetek: As clay deposits become scarce, the brick industry is increasingly seeking additives or substitutes. This study investigates a high- plasticity clay that requires an opening agent, for which was used 10 wt.% of processed steel slag Ekominit S1. Ceramic- technological tests were performed to determine the compressive strength, density and porosity. The addition of Ekominit S1 increased the total porosity by 5% in samples fired at 950 °C, and by 4% in samples fired at 1050 °C, while the compressive strength decreased by 36% in the samples fired at 950 °C and by 38% in those fired at 1050 °C compared to the reference material. Although the mechanical properties were lower than those of the reference, the benefit is reduced shrinkage. The processed steel slag could be incorporated successfully into bricks, which would also reduce the environmental impact of this sector by using secondary products instead of virgin materials.
Ključne besede: clay bricks clay bricks, compressive strength, porosity, opening agent, steel slag
Objavljeno v DiRROS: 15.05.2026; Ogledov: 56; Prenosov: 27
Celotno besedilo (1,09 MB)
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Povzetek: The study investigates alkali-activated fly ash (FA) composites reinforced with keratin-based fibres from Chesapeake Bay Retrievers. To increase reactivity, the FA was milled and sieved below 125 μm, while the fibres were incorporated at two mass ratios (1 m% and 5 m%) relative to the FA as part of the preliminary study. Mechanical tests on 3-day-old composites showed that the addition of 1 m% fibres improved performance significantly, increasing the compressive strength by almost 50% (to ~70 MPa) and bending strength by over 30%. In contrast, the addition of 5 m% fibres resulted in a “hairy”, low-binder structure with reduced geometric density and compressive strength. Nevertheless, the fibre- rich composite displayed a unique cushioning effect that restored shape under cyclic pressure, suggesting potential for non-structural applications such as pathways or insulation. The results demonstrated that small additions of keratin fibres can improve the performance of AAM, but excessive fibre content compromises its strength.
Ključne besede: alkali-activated materials, fly ash, keratin-based fibres, Chesapeake Bay Retriever, circular economy
Objavljeno v DiRROS: 15.05.2026; Ogledov: 58; Prenosov: 36
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Povzetek: Our study was designed to investigate research integrity among scientists actively working in biomedicine. Using the unique opportunity of the Alliance for Life Sciences, a networking initiative of leading research institutions and universities in Central and Eastern Europe, we organized our own in-depth survey on research integrity in the countries involved. We employed a standardized questionnaire consisting of 19 closed questions with simple, multiple-choice, or scaled responses to explore the situation regarding research integrity at Alliance for Life Sciences member institutions. The questionnaire was in English language and was administered through the Qualtrics platform anonymously. Finally, 10 institutions from 10 different countries participated in the study and the aggregated group of respondents consisted of 752 scientists. First, the analysis of the obtained data included descriptive frequencies of the responses to all types of questions. Second, the construction and analysis of the model of latent variables was included to verify assumptions about individual aspects of the observed behavior and their interrelationships. Confirmatory factor analysis was applied to verify the domain structure, followed by multivariate analysis of variance to assess the effects of institutional affiliation, gender, seniority, and ethics training. Our data provide the first systematic description of research integrity at the biomedical research institutions in 10 Central and Eastern European countries. Because the majority of our respondents were experienced researchers, our study is really valuable for mapping the state of research integrity in participating countries. The descriptive part of the results brings a detailed insight into the research environment in relation to research integrity, as well as recent and former personal experiences with scientific misconduct. It also covers the personal acceptability of various forms and consequences of scientific misconduct and personal estimations of scientific misconduct. The unique findings of our study came from the model showing the correlations between latent and higher-order variables, which reflect relevant domains of the questionnaire. Moreover, seniority and ethics training were identified as predictors of adherence to the principles of research integrity. These results emphasized the importance of the favorable research environment regarding scientific integrity, which is apparently interconnected with the incidence of various forms of misconduct as experienced recently or in the past. Our study using a model of latent variables yielded unique results that clearly showed the importance of fostering a favorable research environment, especially through systematic education in research integrity and available institutional policies that both reduce the risk of scientific misconduct.
Ključne besede: biomedical research, fabrication, falsification, plagiarism, questionable research practices, research environment, research integrity, scientific fraud, scientific misconduct
Objavljeno v DiRROS: 15.05.2026; Ogledov: 53; Prenosov: 32
Celotno besedilo (4,56 MB)
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Povzetek: This review highlights a significant gap in the multi-pollutant characterisation of ultrafine particulate matter (PM <0.1 µm), focusing on metal(oid)s and polycyclic aromatic hydrocarbons (PAHs). Fractionation mechanisms, sampling protocols and analytical methods are examined with an emphasis on integrating quality assurance measures to ensure high-quality data and facilitate cross-study comparability. Based on studies published between 2010 and 2025, research has largely focused on the analysis of pollutants bound to PM2.5 or PM10. Only 5% of the studies addressed ultrafine particles (UFPs), which have the greatest toxicological impacts. The measurement of both pollutant groups within a single sampling campaign was rare (14% of the studies). The reliability of analytical data was rarely evaluated. Only 33% of the studies employed certified reference materials for quality control and method validation. Microwave-assisted digestion and ultrasound-assisted extraction were commonly used for sample preparation prior to the determination of metal(oid)s and PAHs, by inductively coupled plasma mass spectrometry and gas chromatography–mass spectrometry, respectively. Both pollutant groups exhibited strong seasonal variability, with elevated concentrations observed during heating periods in cold seasons, as well as associated with fine PM and UFPs, fractions that exhibit high bioaccessibility. Smaller PM fractions were associated with anthropogenic sources, including fossil fuel and biomass combustion, traffic and industrial emissions, while coarse PM reflected naturally-derived crustal material. Overall, these findings highlight the importance of uniform and comprehensive protocols for sampling UFPs and quantifying associated pollutants, which are essential for reliable data and effective urban air quality control strategies aimed at mitigating emissions.
Ključne besede: particulate matter, urban air quality, sampling protocols, analytical methods, metal(oid)s, polycyclic aromatic hydrocarbons
Objavljeno v DiRROS: 15.05.2026; Ogledov: 62; Prenosov: 47
Celotno besedilo (2,27 MB)
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