1. Estimation of measurement uncertainty for determination of sulphate content in cement by an alternative approachLina Završnik, Sabina Dolenec, 2016, izvirni znanstveni članek Povzetek: The precise and accurate determination of sulphate levels in cement is of utmost importance due to the potential occurrence of internal sulphate attack in concrete, which affects the latter’s durability, and thus, also the safety of concrete constructions. The estimated measurement uncertainty provides a level of confidence in the experimental results, and enables the comparison of data, both between different laboratories and between different methods. This paper presents an alternative approach to the estimation of measurement uncertainty in the determination of sulphate in cement, based on the use of proficiency testing data. The calculations used in this procedure refer to the estimation of reproducibility within-laboratory component of the analysis of control samples, as well as of the bias component of sulphate content data for different types of Portland cement derived from several proficiency testing trials.
Ključne besede: cement, sulphate, measurement uncertainty, alternative approach
Objavljeno v DiRROS: 03.03.2025; Ogledov: 0; Prenosov: 2
 Celotno besedilo (366,74 KB)
Gradivo ima več datotek! Več... |
2. Current and future role of instrumentation and monitoring in the performance of transport infrastructure slopesJ. A. Smethurst, Alister Smith, S. Uhlemann, C. Wooff, J. Chambers, P. Hughes, Stanislav Lenart, H. Saroglou, Sarah Springman, H. Löfroth, D. Hughes, 2016, izvirni znanstveni članek Povzetek: Instrumentation is often used to monitor the performance of engineered infrastructure slopes. This paper looks at the current role of instrumentation and monitoring, including the reasons for monitoring infrastructure slopes, the instrumentation typically installed and parameters measured. The paper then investigates recent developments in technology and considers how these may change the way that monitoring is used in the future, and tries to summarize the barriers and challenges to greater use of instrumentation in slope engineering. The challenges relate to economics of instrumentation within a wider risk management system, a better understanding of the way in which slopes perform and/or lose performance, and the complexities of managing and making decisions from greater quantities of data.
Ključne besede: geotechnical monitoring, climate change, pore pressures, displacements
Objavljeno v DiRROS: 03.03.2025; Ogledov: 0; Prenosov: 2
Celotno besedilo (2,40 MB)
Gradivo ima več datotek! Več... |
3. Growth manipulation in electrodeposition of compact and mesoporous electron transport layers for enhanced efficiency and stability in carbon-based perovskite solar cellsTecush Mohammadi, Dimitris A. Chalkias, Nigel Willy Van de Velde, Andrej Race, Elias Stathatos, Boštjan Genorio, Blaž Likozar, Ivan Jerman, 2025, izvirni znanstveni članek Ključne besede: perovskite solar cell, electron transport layer, TiO2 electrodeposition, compact layer, mesoporous layer, photovoltaic performance
Objavljeno v DiRROS: 03.03.2025; Ogledov: 7; Prenosov: 12
Celotno besedilo (2,37 MB)
Gradivo ima več datotek! Več... |
4. Improved adhesion and biocompatibility of chitosan-coated super-hydrophilic PVC polymer substrates for urothelial cathetersAlenka Vesel, Helena Motaln, Miran Mozetič, Dane Lojen, Nina Recek, 2025, izvirni znanstveni članek Povzetek: Chitosan is a water-soluble polysaccharide with good adherence to negatively charged surfaces and reported antimicrobial and anti-inflammatory properties. Coating the surfaces of medical devices with chitosan is a promising strategy for harnessing these benefits. However, the surface properties of commercial polymers need to be altered to enable the bonding of thin chitosan films. In this study, the adhesion of chitosan onto plasma-treated polyvinyl chloride (PVC) and the metabolic activity of urothelial cells on chitosan-coated medical-grade PVC used for the synthesis of urinary catheters were evaluated. To improve the adhesion of chitosan onto the PVC catheters, PVC samples were made “super-hydrophilic”. PVC substrates were briefly treated with a powerful hydrogen plasma and weakly ionised oxygen plasma afterglow to obtain a chlorine-free surface film, which was rich in oxygen functional groups, followed by incubation of the plasma-treated substrates in an aqueous solution of chitosan. Then, urothelial RT4 cells were seeded on the treated and untreated PVC substrates, and their metabolic activity, confluency, and cell morphology were examined. X-ray photoelectron spectroscopy was used to measure the nitrogen concentration, which corresponded to the chitosan concentration on the substrate. The results showed that the substrates were uniformly covered by a thin layer of chitosan only on plasma-treated surfaces and not on untreated surfaces. Moreover, the chitosan coating provided a stimulated environment for cell adhesion and growth. In conclusion, the chitosan-coated super-hydrophilic PVC substrate shows potential to improve the overall performance and safety of medical devices such as urinary catheters.
Ključne besede: medical-grade PVC, chitosan coating, urinary catheter, urothelial cells, cytotoxicity, adhesion, biocompatibility
Objavljeno v DiRROS: 28.02.2025; Ogledov: 46; Prenosov: 20
Celotno besedilo (14,65 MB)
Gradivo ima več datotek! Več... |
5. Structural Insights and hydrogen retention in amorphous and crystalline tungsten oxide filmsJanez Zavašnik, Vasyl Shvalya, Kristof Kremer, Thomas Schwarz-Selinger, Wolfgang Jacob, 2025, izvirni znanstveni članek Povzetek: We investigated structural characteristics of and hydrogen isotope interactions with thermally and electro chemically synthesized tungsten oxide (W-oxide) thin films (≤50 nm). Specifically, we assessed whether elec trochemically synthesized W-oxide could serve as a suitable proxy for thermally grown films in hydrogen interaction studies. The W-oxide thin films were exposed to low-energetic atomic deuterium (D) to explore the hydrogen uptake, retention, and intercalation effects of the W-oxide structure. The W-oxides were characterized using grazing incidence X-ray diffraction (GI-XRD), scanning and transmission electron microscopy (SEM, TEM), Raman spectroscopy, and Fourier-transform infrared spectroscopy (FTIR) before and after deuterium exposure. The thermally grown W-oxides are crystalline, composed of orthorhombic WO3, while the electrochemically grown W-oxides are amorphous with nanocrystalline domains. Deuterium retention studies revealed that the electrochemically grown W-oxides show higher initial D retention compared with their thermally grown coun terparts and lower D release over time during storage, suggesting stronger D binding within the amorphous matrix. Using ion beam analysis, we quantified the deuterium retention and examined the depth-resolved reduction of the oxide within the films following deuterium exposure
Objavljeno v DiRROS: 28.02.2025; Ogledov: 60; Prenosov: 20
Celotno besedilo (12,30 MB) |
6. |
7. |
8. Autochthonous conifers of family Pinaceae in Europe : broad review of morpho-anatomical and phytochemical properties of needles and genetic investigationsBiljana M. Nikolić, Dalibor Ballian, Zorica S. Mitić, 2024, pregledni znanstveni članek Povzetek: Gymnosperms are a very old and small group of plants compared to angiosperms. Contemporary science recognizes about 650 extant conifers worldwide. This review focuses on species of the Pinaceae family found in Europe. There are 23 species from the genera Abies, Larix, Picea, and Pinus. Some of them are widespread in Europe, but others have fragmented and limited distribution and are classified as relic, endemic, or endangered. The aim of this review is providing cumulative information about the variability of needle morpho-anatomy, terpenes, and n-alkanes, as well as the genetics of the Pinaceae species, native to Europe. The first morpho-anatomical examinations of needles were conducted in the 19th century. A lot of species have been investigated up to now, but the population variability of many conifer species is still not known. The composition and abundance of terpenes differ between genera and families but also within the same genus, pointing to their taxonomic importance. n-Alkanes on the needle wax surfaces of conifers are sometimes very useful markers of species and population variability. The most abundant n-alkanes in Abies species are nonacosane (C29), hentriacontane (C31), or heptacosane (C27), whereas in Larix decidua and the majority of Picea species, C31 is predominant. C31 and C29 are the dominant n-alkanes in the genus Pinus. The most extensive population-genetic studies of European representatives of the Pinaceae family have focused on Abies alba, Picea abies, Pinus nigra, and Pinus sylvestris, but also examined endemic species such as Abies borisii-regis, A. cephalonica, A. nebrodensis, and Picea omorika. These studies hold significant practical value in assessing species’ evolutionary potential, devising strategies for long-term species conservation, identifying centers of diversity, detecting relict and ancestral populations, unveiling cryptic species and hybrids, and elucidating the taxonomic significance of species. These investigations are of great value not only on the biodiversity level, but also on the levels of ecology, physiology, taxonomy, and evolution.
Ključne besede: Europe, Pinaceae, conifers, needle morphology, needle anatomy, terpenes, n-alkanes, genetic markers
Objavljeno v DiRROS: 27.02.2025; Ogledov: 77; Prenosov: 52
Celotno besedilo (1013,69 KB)
Gradivo ima več datotek! Več... |
9. |
10. |
