1. Optimized mix design and fire resistance of geopolymer recycled aggregate concrete under elevated temperaturesBright Asante, Bo Wang, Libo Yan, Bohumil Kasal, 2025, izvirni znanstveni članek Opis: This study investigates the performance of fly ash-based geopolymer recycled aggregate concrete (GRAC) as a sustainable alternative to Ordinary Portland Cement (OPC) concrete, focusing on its compressive strength and behavior under high-temperature exposure (150 °C, 300 °C, 600 °C, and 900 °C). The research emphasizes the use of 100 % recycled concrete aggregates as a replacement for natural aggregates, with samples cured at ambient conditions and at 60 °C in an oven. Key factors, including water content and curing conditions, were evaluated to determine their influence on compressive strength and thermal stability. Results indicate that water content is the primary factor governing compressive strength, while recycled aggregates contribute to a secondary but notable effect. GRAC maintained up to 65 % of its initial strength after exposure to 600 °C, though strength degradation and severe cracking occurred at 900 °C. Oven-cured samples showed fewer surface cracks but experienced slightly higher mass loss than room-cured counterparts. This study highlights the potential of GRAC as an environmentally friendly material capable of withstanding moderate thermal conditions, providing significant contributions to green construction practices and the reuse of construction and demolition waste.
Ključne besede: geopolymer, recycled aggregate concrete, elevated temperature
Objavljeno v RUP: 23.12.2025; Ogledov: 204; Prenosov: 2
 Celotno besedilo (11,27 MB)
Gradivo ima več datotek! Več... |
2. Tight toughness variant condition for fractional k-factorsWei Gao, Weifan Wang, Yaojun Chen, 2026, izvirni znanstveni članek Opis: The toughness t(G) of graph G is formalized as the minimum ratio of |S| and ω(G − S) over all vertex subsets S subject to ω(G − S) > 1. As the unique variant parameter of toughness, τ(G) is formulated as the minimum ratio of |S| and ω(G − S) − 1 traversing all the vertex subset S restricted to ω(G − S) ≥ 2. The extant contributions reveal that there is a substantial correlation between toughness and fractional factors. However, there is still a paucity of solid studies on toughness variants τ(G). This work provides several theoretical underpinnings for the tight toughness variant bound for a graph G which admits a fractional k-factor. To be specific, a graph G has a fractional k-factor if τ(G) > k for k ≥ 3 and if τ(G)>3/2 for k = 2. The sharpness of the given bounds is explained by counterexamples.
Ključne besede: graph, toughness, toughness variant, fractional k-factor
Objavljeno v RUP: 21.12.2025; Ogledov: 261; Prenosov: 0
Celotno besedilo (1,11 MB) |
3. Is the Environmental Kuznets Curve Still Relevant in the Modern Context? : Insights From Air Pollutants in Chinese CitiesJun Wang, Shinah Park, Gulsah Akar, 2025, izvirni znanstveni članek Opis: This study investigated the presence of EKC-like relationships between various socioeconomic variables and air pollution indicators across 151 Chinese cities, analysed by quadratic regression models and geographic weighted regression (GWR) analysis. The results present critical insights into the applicability and limitations of the EKC. Only Air Quality Index, Nitrogen Dioxide (NO2), and Fine Particulate Matter (PM2.5) show statistically significant correlations with one socioeconomic variable, respectively, in an EKC-like pattern which is meaningful in reality. GWR coefficients serve as a diagnostic tool to identify those burdened cities where stricter emissions standards, greener industrial practices, or economic restructuring should be prioritized. The spatial dependencies challengethe EKC’s assumption of isolated environmental-economic dynamics. Stricter environmental regulations in developed areas often lead to the displacement of polluting activities to regions with laxer standards. Policy efforts in tackling air pollution should focus on directly reducing emissions through localized, technology-based interventions rather than relying on economic growth to eventually improve air quality. Spatially targeted policies informed by city-specific patterns are essential, as pollution outcomes are shaped by regional industrial structures, population density, and cross-boundary spillover effects.
Ključne besede: Air pollution, City development, Industrialization, Sustainable development, Carbon Neutral
Objavljeno v RUP: 18.12.2025; Ogledov: 192; Prenosov: 1
Celotno besedilo (808,13 KB)
Gradivo ima več datotek! Več... |
4. Interlaboratory study of automated sorption measurements in wood : method for correcting systematic errors with the commonly used 0.002% min[sup] -1 stop criterionSamuel L. Zelinka, Samuel V. Glass, Natalia Farkas, Emil Engelund Thybring, Michael Altgen, Lauri Rautkari, Simon F. Curling, Jinzhen Cao, Yujiao Wang, Tina Künniger, Matthew Schwarzkopf, 2025, izvirni znanstveni članek Opis: Many studies that use an automated sorption balance to determine a water vapor sorption isotherm for wood collect data until the moisture content change is less than or equal to 0.002% min−1 (20 µg g−1 min−1). This stop criterion has been claimed to give errors in equilibrium moisture content (EMC) predictions of less than 0.001 g g−1 but over the past 10 years, studies have shown that the actual errors can be greater than 0.01 g g−1 because the measurements are stopped well before equilibrium is reached. Despite the large errors associated with this stop criterion, it remains popular due to the speed at which isotherms can be measured. This paper utilizes data from a worldwide interlaboratory study on automated sorption balances to develop a correction method for estimating EMC of western larch (Larix occidentalis Nutt.) from the moisture content corresponding to the 20 µg g−1 min−1 criterion. The study uses data from 72 relative humidity absorption steps with hold times of 7–10 days from 21 different laboratories and eight different instrument models. EMC is defined based on the inherent mass stability of automated sorption balances determined in the first part of this interlaboratory study. On average the sorption process is less than 80% complete when the 20 µg g−1 min−1 criterion is reached, resulting in a mean absolute error (MAE) of 0.006 g g−1. The correction equation for estimating EMC reduces the MAE to 0.001 g g−1. The analysis presented in this paper, along with the correction equation, can be considered for certain use cases to reduce systematic errors and shorten measurement times.
Ključne besede: water vapor sorption, dynamic vapor sorption, sorption isotherms, equilibrium moisture content, interlaboratory study
Objavljeno v RUP: 14.11.2025; Ogledov: 362; Prenosov: 5
Celotno besedilo (3,09 MB)
Gradivo ima več datotek! Več... |
5. Understanding and predicting the geographic distributions of phlebotomine sand flies in and around EuropeDanyang Wang, Anouschka R. Hof, Kevin D. Matson, Frank van Langevelde, Edwin Kniha, Vít Dvořák, Ognyan Mikov, Ivelina Katerinova, Simona Tchakarova, Maria Antoniou, Jorian Prodhomme, Denis Sereno, Vladimir Ivović, Katja Adam, 2025, izvirni znanstveni članek Opis: Climate and land-use changes influence the transmission of vector-borne diseases by affecting the distribution and survival of disease vectors. Numerous diseases are transmitted by phlebotomine sand flies (Diptera: Psychodidae: Phlebotominae), including leishmaniasis. Several major sand fly-borne diseases are responsible for high global disease burdens and high socio-economic costs. In Europe, over 20 known sand fly vector species are largely confined to the Mediterranean Basin, yet records of sand fly presence further north increase. Global warming is predicted to drive the spread of sand flies to large areas of Europe in the 21th century, an effect likely to be exacerbated by anthropogenic factors. However, the constraints to the geographic distributions of sand flies are not well understood. This study aims to increase the understanding of the drivers of the geographic distributions of sand flies, using species distribution modelling to systematically test links between sand fly occurrences and climatic, land-use, lithological, biodiversity and human population variables in Europe and adjacent Mediterranean regions. We found that moisture is the most important environmental variable both in explaining and in predicting sand fly occurrences. The projected suitable habitats are larger than the current known sand fly distributions, and these habitats are expected to expand due to changes in climate and land-use.
Ključne besede: climate change, land-use, moisture, phlebotomine sand fly, species distribution modelling, suitable habitat
Objavljeno v RUP: 06.11.2025; Ogledov: 374; Prenosov: 8
Celotno besedilo (2,53 MB)
Gradivo ima več datotek! Več... |
6. |
7. Interlaboratory study of the quality of water vapor sorption data for wood from automated sorption balancesSamuel L. Zelinka, Samuel V. Glass, Natalia Farkas, Emil Engelund Thybring, Michael Altgen, Lauri Rautkari, Simon F. Curling, Jinzhen Cao, Yujiao Wang, Tina Künniger, Matthew Schwarzkopf, 2025, izvirni znanstveni članek Opis: Automated sorption balances are widely used for characterizing the interaction of water vapor with hygroscopic materials. This paper is part of an interlaboratory study investigating the stability and performance of automated sorption balances. A previous paper in this study investigated the mass, temperature, and relative humidity (RH) stability of automated sorp- tion balances by looking at the mass change of a non-hygroscopic sample over time. In this study, we examine the mass stability of wood samples held at constant RH for seven to ten days after a step change. The reason for the long hold times was to collect data to “operational equilibrium” where the change in mass is on the order of the inherent operational stability of the instrument. A total of 80 datasets were acquired from 21 laboratories covering absorption with final RH levels ranging from 10 to 95%. During these long hold times, several unusual behaviors were observed in the mass-vs-time curves. Deviations from expected sorption behavior were examined by fitting the data to an empirical sorption kinetics model and calculating the root mean square error (RMSE) between the observed and smoothed behavior. Samples that had a large RMSE relative to the median RMSE of the other datasets often had one of several types of errors: abrupt disturbances, diurnal oscillations, or long-term mass decline during an absorption step. In many cases, mass fluctuations were correlated with changes in the water reservoir temperature of the automated sorption balance. We discuss potential errors in sorption measurements on hygroscopic materials and suggest an acceptable level of RMSE for sorption data.
Ključne besede: water vapor sorption, dynamic vapor sorption, sorption isotherms, interlaboratory study
Objavljeno v RUP: 25.07.2025; Ogledov: 551; Prenosov: 2
Celotno besedilo (2,87 MB)
Gradivo ima več datotek! Več... |
8. |
9. Advancements in thermochemical modification of wood for bioenergy and biomaterial applicationsDavid Brian DeVallance, Xinfeng Xie, Tianmiao Wang, Jingxin Wang, 2020, samostojni znanstveni sestavek ali poglavje v monografski publikaciji Ključne besede: carbonization, woody biomass, thermochemical pretreatment, carbonized wood, biochar, torrefaction, densified biomass, wood pellets
Objavljeno v RUP: 29.03.2020; Ogledov: 5620; Prenosov: 70
 Povezava na celotno besedilo |
10. |
