1. Comparison of Slovenian traditional plum materials with genetic resources from the Slovenian plant genetic bankTina Ternjak, 2024, izvirni znanstveni članek Opis: The Slovenian Plant Gene Bank (SPGB) of the Faculty of Agriculture and Life Sciences houses approximately 250 accessions of stone fruit, with most of the material belonging to the species Prunus domestica L. and Prunus cerasifera Ehrh. The main objectives of this study using a set of 11 SSR primers were: 1. to determine the genetic structure of the traditional Slovenian in situ plum material in comparison to the ex situ the SPGB collection; 2. to identify unique material among the in situ collected accessions; 3. to gain insight into the genetic relationship between the two studied species. The genetic structure of 60 plum samples was analyzed using Principal Coordinate Analysis (PCoA) and Bayesian model-based analysis. PCoA separated the P. cerasifera and P. domestic accessions, while Bayesian model-based analysis revealed that many accessions of P. domestica and P. cerasifera shared a common ancestral history. The ex situ material showed greater genetic diversity as it was distributed over more populations than the in situ material. Promising in situ genotypes, especially from the Prekmurje and Lower Styria, were identified as valuable additions to enrich the existing collection.
Ključne besede: plum, Prunus domestica L., Prunus cerasifera Ehrh., SSR markers, genetic structure
Objavljeno v DKUM: 23.04.2025; Ogledov: 0; Prenosov: 0
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2. On-line foreign object detection using double DD coils in an inductive wireless power transfer systemNataša Prosen, Miro Milanovič, Jure Domajnko, 2022, izvirni znanstveni članek Opis: This paper proposes an on-line method for foreign object detection in a double DD coil
system. The foreign object is detected by real-time measurement of the mutual inductance between
the transfer pads. Measurement of the mutual inductance between coils can be performed at the
start, during initialisation, or during the wireless power transfer. The coils in the double DD coil
structure can be used separately; one coil can be used for power transfer and the other can be used
for the mutual inductance measurement. The mutual inductance measurement is based on the
voltage measurement across the open circuit receiver coil. The measured value of mutual inductance
between the transmitter and the receiver pad can be used in a control algorithm and in a foreign
object detection algorithm. Additionally, a 2DDq coil structure can be used as a replacement for the
double DD coil structure, which increases the power transfer density. The DD coils in the double DD
coil structure can also be driven using two phase-shifted voltages, which enables better location and
detection of foreign objects. The method also helps to differentiate the mutual inductance change due
to the distance change from the mutual inductance change due to the presence of a foreign object.
Ključne besede: WPT, double DD coil structure, mutual inductance measurement, coupling coefficient measurement, FOD, on-line measurement
Objavljeno v DKUM: 01.04.2025; Ogledov: 0; Prenosov: 2
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3. Control of an inductive power transfer system using a double coil structureNataša Prosen, Mitja Truntič, Jure Domajnko, 2022, izvirni znanstveni članek Opis: This paper presents the design of the control of the system using a double DD coil structure.
The double DD coil is a layered coil structure that consists of two single DD coils, rotated to each other
by 90◦. A large-signal and small-signal model of the proposed IPT system are designed for control
synthesis. The small-signal model is derived from the large-signal using harmonic approximation
and the extended describing functions (EDF). For the small-signal model, voltage and current control
schemes were proposed for the purpose of wireless battery charging. The robustness of the control is
tested on a small-scale IPT system using double DD coils and resistive load. The results are evaluated
at different reference voltages, currents, loads and coupling coefficients.
Ključne besede: wireless power transfer, double DD coil structure, voltage control, IPT with multiple coils
Objavljeno v DKUM: 28.03.2025; Ogledov: 0; Prenosov: 2
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4. In-plane deformation behavior and the open area of rotating squares in an auxetic compound fabricPolona Dobnik-Dubrovski, Nejc Novak, Matej Borovinšek, Matej Vesenjak, Zoran Ren, 2022, izvirni znanstveni članek Opis: A conventional compound fabric was used to develop a modern, multifunctional material
with an auxetic behaviour and a tailored open area for particle filtration. Such material was produced
using traditional textile technology and laser cutting, to induce a rotating squares unit geometry. The
behaviour was investigated of three different rotating unit cell sizes. The laser slit thickness and the
length of the hinges were equal for all three-unit cells. The tensile properties, Poisson’s ratio and
auxetic behaviour of the tested samples were investigated, especially the influence of longitudinal
displacement on the fabric’s open area and the filtered particle sizes (average and maximum). Results
show that the developed compound fabric possesses an average negative Poisson’s ratio of up to
−1, depending on the applied auxetic geometry. The larger rotating cell size samples offer a higher
average negative Poisson’s ratio and a higher breaking strength due to the induced slits. The findings
highlight the usefulness of patterned cuts in conventional textile materials to develop advanced
auxetic textile materials with tailored geometrical and mechanical properties.
Ključne besede: compound textile material, auxetic structure, open area, filtration, mechanical properties, Poisson’s ratio
Objavljeno v DKUM: 25.03.2025; Ogledov: 0; Prenosov: 3
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5. Seismic resistance of existing buildings with added light timber structure storeysJurij Jančar, Trajče Zafirov, Miroslav Premrov, Bruno Dujič, Viktor Hristovski, 2022, izvirni znanstveni članek Opis: In the presented paper, the problem of vertical expansions is treated in terms of seismic resistance of structures with added storeys. A large parametric study has been performed, confirming the impact of different number of added storeys, and the change of their stiffness, on the seismic response of structures. The paper shows examples of how stiffness in light timber frame and cross laminated timber structures can be easily altered just by changing the type and distribution of fasteners. Known procedures are used to calculate the stiffness of the wall elements of a light timber frame system, and a new procedure is developed for determining the stiffness of cross laminated timber wall elements. The study shows how changing the stiffness of the vertical expansion can have a significant impact on the seismic response and that, in some cases, vertical expansion can have a favourable effect on seismic resistance, despite a minor increase in the mass of the structure.
Ključne besede: added storeys, seismic resistance, light timber structure
Objavljeno v DKUM: 12.03.2025; Ogledov: 0; Prenosov: 2
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6. Use of Lignin, Waste Tire Rubber, and Waste Glass for Soil StabilizationSüleyman Gücek, Cahit Gürer, Bojan Žlender, Murat V. Taciroğlu, Burak E. Korkmaz, Kürşat Gürkan, Tamara Bračko, Borut Macuh, Rok Varga, Primož Jelušič, 2024, izvirni znanstveni članek Opis: The complex interactions between soil and additives such as lignin, glass powder, and rubber tires were investigated using principles of material and soil mechanics. Previous research has mainly focused on individual additives in clay soils. In contrast, this study investigates soil improvement with two different types of waste materials simultaneously. The improvement of soil properties by hybrid waste materials was evaluated using several laboratory tests, including the standard Proctor test, the unconfined compressive strength test, the California Bearing Ratio (CBR) test, and cyclic triaxial tests. The aim of this research is to identify key parameters for the design and construction of road pavements and to demonstrate that improving the subgrade with hybrid waste materials contributes significantly to the sustainability of road construction. The mechanical and physical properties were evaluated in detail to determine the optimal mixtures. The results show that the most effective mixture for the combination of waste glass powder and rubber tires contains 20% glass powder and 3% rubber tires, based on the dry weight of the soil. For the combination of waste glass powder and lignin, the optimum mixture consists of 15% glass powder and 15% lignin, based on the dry weight of the soil. These results provide valuable insights into the sustainable use of waste materials for soil stabilization in road construction projects.
Ključne besede: soil stabilization, waste glass, tire rubber waste, lignin, hybrid waste usage, mechanical
properties, pavement structure
Objavljeno v DKUM: 28.02.2025; Ogledov: 0; Prenosov: 3
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7. A link between species abundance and plant strategies for semi-natural dry grasslandsNataša Pipenbaher, 2024, izvirni znanstveni članek Opis: Due of the potential of species to determine ecosystem properties, it is important to understand how species abundance influences community assembly. Using vegetation surveys on 35 dry grasslands in north-east Slovenia, we defined dominant (8) and subordinate (61) plant species. They were compared on 14 traits to test for differences in community-weighted mean (CWM) and functional diversity (FD). We found that dominants and subordinates differed strongly in their functional traits. Dominants showed higher leaf dry matter content and a more pronounced stress tolerance strategy and were all clonal with a large proportion of species with rhizomes and a rich bud bank, while other species showed a higher specific leaf area, a longer flowering period and more ruderals. For most traits, FD was higher in subordinates. Our results suggest that dominants drive community structure by limited susceptibility to non-competitive processes. Dominants may have positive effects on subordinates by mitigating environmental stressors. Subordinates are able to assemble together by being dissimilar and use different fine-scale niches that are engineered and homogenised by dominants. Our results show that there are fundamental differences in the relative importance of ecological processes between dominant and subordinate plants in species-rich grasslands, which is also important for their conservational management.
Ključne besede: species coexistence, biodiversity, community assembly, species dominance, subordinate species, Festuco-Brometea, plant functional traits, community structure
Objavljeno v DKUM: 26.02.2025; Ogledov: 0; Prenosov: 3
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8. Integrated optimization framework for a biomass supply network and steam Rankine cycleMonika Dokl, Zdravko Kravanja, Lidija Čuček, 2024, izvirni znanstveni članek Opis: The optimization of biomass supply chains is becoming increasingly important, especially for low-density biomass feedstocks that have limited market value and require efficient handling and logistics. This study addresses this issue by proposing an integrated approach to optimize biomass supply chain networks for energy production with the steam Rankine cycle. The approach takes into account the inherent variability of feedstock availability and energy market values, to ensure adaptability to fluctuating conditions. The biomass supply network is formulated as a mixed-integer nonlinear programming problem, where the optimization objective is to maximize the economic viability of the system. The optimal configuration of the supply network includes the selection of biomass supply zones and storage facilities, the transportation links, and the optimization of the process variables within the conversion plants, taking into account the variable heat demand. The optimization approach is applied to a hypothetical case study of a relatively small region in Slovenia. The results show the economic viability of biomass utilization with a net present value of almost 300 MEUR, generating about 4 MW of electricity and 65 MW of heat. The uncertainties of the biomass supply, the fluctuations in product prices and the spatial scope of the case study are evaluated in addition. This analysis highlights and discusses the impact of these factors on the economic performance of the biomass supply chain network.
Ključne besede: copper(II) coordination compounds, methylamines, crystal structure, magnetic properties, thermogravimetric analysis
Objavljeno v DKUM: 31.01.2025; Ogledov: 0; Prenosov: 3
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9. The correlation between demographic development and land-use changes in SloveniaUroš Horvat, Igor Žiberna, 2020, izvirni znanstveni članek Opis: The paper focuses on determining the degree of correlation between land-use changes and demographic development in Slovenia. The authors conclude that there is still insufficient evidence in the literature for a correlation between these two processes, because quantitative studies addressing these links are very rare and mostly cover small and specific areas. In the case of Slovenia, Spearman’s correlation coefficients are quite low, which confirms that land-use change processes are complex and not dependent solely on individual demographic and socioeconomic factors. Despite the low correlation coefficients, our findings indicate that changes in land use are significantly influenced by changes in age structure and population growth. In areas with population growth the share of arable land is shrinking, whereas in areas with depopulation and a rising aging index the share of partially overgrown land is growing. In the following analysis, the authors focus their analysis on a case study of the Mura and Central Slovenia statistical regions, which lie on opposite poles with regard to development, and thus show differing trends in land-use changes.
Ključne besede: land use, geography, agricultural land, arable land, afforestation, demography, age structure, Slovenia
Objavljeno v DKUM: 23.01.2025; Ogledov: 0; Prenosov: 12
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