1171. Integralni opis svetil in svetlobnih virovKatja Malovrh Rebec, Marta Klanjšek Gunde, Friderik Knez, 2015, original scientific article Abstract: Celostno vrednotenje svetilk in svetlobnih virov upošteva tako svetlobnotehnične kot tudi fotobiološke ter okoljske učinke, ki jih povzročajo tovrstni proizvodi. Fotobiološko vrednotenje počasi dobiva jasnejše oblike, saj so raziskave v zadnjem času ponudile ustrezne parametre za njihovo vrednotenje. Premiki pa se dogajajo tudi na okoljskem področju in gledetrajnostnosti rabe svetilk in virov. Okoljske deklaracije produktov (EPD - Environmental Product Declaration), ki opisujejo vplive proizvodov na okolje, so namenjene predvsem komunikaciji med podjetji (B2B - business-to-business). Skladne so s standardom ISO 14025. Pri razsvetljavi se srečamo z ožjo temo, in sicer trajnostnostjo gradnje in gradbenih proizvodov. Pri tem se ne sprašujemo le, kakšna je raba energije v času uporabe proizvoda, temveč tudi, koliko energije je v proizvod vgrajene v času nastajanja ter kaj se zgodi, ko proizvod zavržemo. Deklaracija EPD torej temelji na oceni celotnega življenjskega cikla ali LCA-analizi (Life Cycle Assessment). Pripravili smo podrobnejšo analizo in interpretacijo 5 primerov EPD-jev svetil različnih proizvajalcev. V nekatera svetila so vgrajeni LED-viri (Philips, Zumtobel), v druga pa kompaktne fluorescenčne sijalke CFL (Thorn) ali metalhalogenidni viri (We-Ef Leuchten), obravnavamo tudi primer za predstikalno napravo (Tridonic). Primerljivost rezultatov ostaja velik izziv.
Keywords: svetlobna tehnika, svetila, tehnične zahteve, okoljske zahteve
Published in DiRROS: 05.09.2025; Views: 272; Downloads: 115
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1172. Mechanical and microstructural characterization of geopolymer synthesized from low calcium fly ashSabina Dolenec, Vilma Ducman, 2015, original scientific article Abstract: This study deals with the mechanical and microstructural characterization of geopolymers synthesized from locally available fly ash. A low calcium fly ash was activated using a sodium silicate solution. Samples were characterized by means of flexural and compressive tests, Fourier Transform Infrared (FTIR) spectroscopy, X-ray powder diffraction (XRD), and scanning electron microscopy(SEM). Porosity and pore size distributions were identified using mercury intrusion porosimetry and gas sorption. The compressive strength of the produced geopolymers, which is in the range of 1.6 to 53.3 N/mm2, is strongly related to the water content as well as SiO2/Na2O mass ratio of an alkali activator. The compressive strength significantly increased with decreases in the water content and increased silicon concentration used for the synthesis of geopolymers.
Keywords: geopolymers, fly ash, microstructure, mechanical properties
Published in DiRROS: 05.09.2025; Views: 353; Downloads: 187
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1173. Evaluation of various retrofitting concepts of building envelope for offices equipped with large radiant ceiling panels by dynamic simulationsSabina Jordan, Jože Hafner, Tilmann E. Kuhn, Andraž Legat, Martina Zbašnik-Senegačnik, 2015, original scientific article Abstract: In order to achieve significant savings in energy and an improved level of thermal comfort in retrofitted existing buildings, specific retrofitting concepts that combine new technologies and design need to be developed and implemented. Large radiant surfaces systems are now among the most promising future technologies to be used both in retrofitted and in new low-energy buildings. These kinds of systems have been the topic of several studies dealing with thermal comfort and energy utilization, but some specific issues concerning their possible use in various concepts for retrofitting are still poorly understood. In the present paper, some results of dynamic simulations, with the transient system simulation tool (TRNSYS) model, of the retrofitted offices equipped with radiant ceiling panels are presented and thoroughly analysed. Based on a precise comparison of the results of these simulations with actual measurements in the offices, certain input data for the model were added, so that the model was consequently validated. The model was then applied to the evaluation of various concepts of building envelopes for office retrofitting. By means of dynamic simulations of indoor environment it was possible to determine the benefits and limitations of individual retrofitting concepts. Some specific parameters, which are relevant to these concepts, were also identified.
Keywords: radiant ceiling panels, heating, cooling, modelling, dynamic simulation, retrofitting concepts
Published in DiRROS: 05.09.2025; Views: 286; Downloads: 162
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1174. Railway bridge weigh-in-motion systemAleš Žnidarič, Jan Kalin, Maja Kreslin, Peter Favai, Przemyslaw Kolakowski, 2016, published scientific conference contribution Abstract: The paper provides an overview of the development of a railway bridge weigh-in-motion (B-WIM) system, one of the first of its kind for weighing trains in motion. A steel truss bridge in Poland was used for testing the system. Four trains which passed over the bridge were weighed in a rail yard in Warsaw. The conventional road B-WIM system was adapted to calculate the weights of the train carriages using the measured response from the test bridge and the accuracy of the system was assessed. Initial result showed that weights of one of the four trains of known weight were predicted very accurately, but accuracy of the other three trains was poor, with calculated carriage weights deviating by as much as 30% from their actual values. An in-depth analysis showed that these trains were changing velocity as they traversed the bridge and that the large errors were directly correlated to this changing velocity. The standard B-WIM algorithm, which assumed a constant velocity during the passage of a vehicle or train, was adjusted to allow for the effect of this changing velocity. The results improved dramatically, with the vast majority of the calculated wagon weights falling within 5% of their actual values. Further developments tailored the B-WIM algorithm for weighing trains, including the system interface that employs graphics of locomotives and wagons. The development of the railway B-WIM has been a success and has demonstrated that calculations of train weights using instrumented bridges can be efficiently performed.
Keywords: accuracy, B-WIM, measurement error, train, weigh-in-motion
Published in DiRROS: 05.09.2025; Views: 257; Downloads: 109
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1175. Long-term post-event processes and major reactivation of a complex landslide: 2000–2023 evolution of the Ciprnik landslide, Julian Alps, SloveniaAndrej Novak, Marko Vrabec, Andrej Šmuc, 2025, original scientific article Abstract: The Ciprnik complex landslide in the Planica valley (NW Slovenia) happened on 19. 11. 2000 as a translation slip-debris flow-hyperconcentrated flow event. It was triggered by a combination of the local geological structure (highly fractured beds dipping parallel to the surface), lithology (alternation of thin bedded carbonates and fine-grained clastics), and record-breaking monthly rainfall (613.6 mm in the month of the event). Twenty-three years later, on the night from 24. to 25. 10. 2023, large parts of the landslide reactivated during intense short-duration rainfall, which has a relatively common occurrence (104.2 mm in 24 h). We use 2006–2023 time series of photogrammetrically derived digital elevation models generated from aerial photographs and unmanned aerial vehicle surveys, sedimentological analysis, and meteorological data to (1) analyze decade-scale post-event processes on the Ciprnik landslide following the initial sliding event in November 2000 and (2) to study the October 2023 event and compare it to the November 2000 event. We find that after the initial November 2000 event, the area of the Ciprnik landslide remained unstable with an average annual erosion rate of 1000 to 3500 m3 of sediment. The 2023 event measured 26,000 m3 and, despite a different triggering rainfall, again occurred as a translation slip-debris flow-hyperconcentrated flow event exhibiting a strong fining down of sediment (from muddy-sandy-gravel to sandy-silt). This study demonstrates the complexity of triggering thresholds in the aftermath of the main mass movement event. Even in the later events, which have the same transport mechanisms as the original event, the triggering precipitation can differ considerably in duration and magnitude.
Keywords: complex landslide, translational slip, debris flow, hyperconcentrated flow, UAV, granulometry
Published in DiRROS: 04.09.2025; Views: 144; Downloads: 101
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1176. Different glycosylation profiles of cystatin F alter the cytotoxic potential of natural killer cellsEmanuela Senjor, Martina Pirro, Urban Švajger, Mateja Prunk, Jerica Sabotič, Anahid Jewett, Paul J. Hensbergen, Milica Perišić, Janko Kos, 2024, original scientific article Abstract: Cystatin F, a cysteine peptidase inhibitor, is a potent modulator of NK cytotoxicity. By inhibiting granule-mediated cytotoxicity pathway, cystatin F induces formation of non-functional NK cell stage, called split-anergy. We show that N-glycosylation determines the localization and cellular function of cystatin F. Cystatin F mostly exhibited high-mannose glycosylation in U-937 cells, both high-mannose and complex glycosylation in NK-92 and primary NKs, and predominantly complex glycosylation in super-charged NKs. Manipulating N-glycosylation with kifunensine increased high-mannose glycosylation of cystatin F and lysosome localisation, which decreased cathepsin C activity and reduced NK cytotoxicity. Mannose-6-phosphate could significantly reduce the internalization of extracellular cystatin F. By comparing NK cells with different cytotoxic potentials, we found that high-mannose cystatin F was strongly associated with lysosomes and cathepsin C in NK-92 cell line. In contrast, in highly cytotoxic super-charged NKs, cystatin F with complex glycosylation was associated with the secretory pathway and less prone to inhibit cathepsin C. Modulating glycosylation to alter cystatin F localisation could increase the cytotoxicity of NK cells, thereby enhancing their therapeutic potential for treating cancer patients.
Keywords: cystatin F, immunosuppression, NK cells, N-Glycosylation
Published in DiRROS: 04.09.2025; Views: 314; Downloads: 93
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1177. Cysteine cathepsins as therapeutic targets in immune regulation and immune disordersEmanuela Senjor, Janko Kos, Milica Perišić, 2023, review article Abstract: Cysteine cathepsins, as the most abundant proteases found in the lysosomes, play a vital role in several processes—such as protein degradation, changes in cell signaling, cell morphology, migration and proliferation, and energy metabolism. In addition to their lysosomal function, they are also secreted and may remain functional in the extracellular space. Upregulation of cathepsin expression is associated with several pathological conditions including cancer, neurodegeneration, and immune-system dysregulation. In this review, we present an overview of cysteine-cathepsin involvement and possible targeting options for mitigation of aberrant function in immune disorders such as inflammation, autoimmune diseases, and immune response in cancer.
Keywords: cysteine cathepsins, inflammation, autoimmune diseases, cancer
Published in DiRROS: 04.09.2025; Views: 370; Downloads: 180
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1178. New inhibitors of cathepsin V impair tumor cell proliferation and elastin degradation and increase immune cell cytotoxicityAna Mitrović, Emanuela Senjor, Marko Jukič, Lara Bolčina, Mateja Prunk, Matic Proj, Milica Perišić, Stanislav Gobec, Janko Kos, 2022, original scientific article Abstract: Cathepsin V is a human lysosomal cysteine peptidase with specific functions during pathological processes and is as such a promising therapeutic target. Peptidase inhibitors represent powerful pharmacological tools for regulating excessive proteolytic activity in various diseases. Cathepsin V is highly related to cathepsin L but differs in tissue distribution, binding site morphology, substrate specificity, and function. To validate its therapeutic potential and extend the number of potent and selective cathepsin V inhibitors, we used virtual high-throughput screening of commercially available compound libraries followed by an evaluation of kinetic properties to identify novel potent and selective cathepsin V inhibitors. We identified the ureido methylpiperidine carboxylate derivative, compound 7, as a reversible, selective, and potent inhibitor of cathepsin V. It also exhibited the most preferable characteristics for further evaluation with in vitro functional assays that simulate the processes in which cathepsin V is known to play an important role. Compound 7 exerted significant effects on cell proliferation, elastin degradation, and immune cell cytotoxicity. The latter was increased because compound 7 impaired conversion of immunosuppressive factor cystatin F to its active monomeric form. Taken together, our results present novel potent inhibitors of cathepsin V and provide new hit compounds for detailed development and optimization. Further, we demonstrate that cathepsin V is a potential target for new approaches to cancer therapy.
Published in DiRROS: 04.09.2025; Views: 269; Downloads: 181
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