1. Do agri-environmental schemes reduce farm greenhouse gas emissions? : evidence from SloveniaŠtefan Bojnec, Imre Fertő, 2026, izvirni znanstveni članek Opis: Reducing greenhouse gas (GHG) emissions from agriculture is a key objective of the European Union's Green Deal and is among considerations of the Common Agricultural Policy (CAP). Agri-environmental schemes (AES) are the main CAP instruments to promote more sustainable farming, yet their short-term climate effectiveness remains uncertain. This study provides the first farm-level evidence for Slovenia on whether AES participation reduces GHG emission intensity and whether effects differ across production systems. Using a balanced panel of 227 farms from the Farm Accountancy Data Network (2014–2021), we estimate dynamic treatment effects of AES adoption on net carbon dioxide-equivalent emissions per hectare, applying modern difference-in-differences (DiD) estimators for staggered adoption and extensive robustness checks, including alternative estimators, placebo tests, and dynamic conditioning. Results show that AES adopters had higher pre-adoption emission intensity, consistent with targeted uptake by higher-emission farms. However, estimated reductions in emission intensity during the first one to two years after adoption are small, statistically insignificant, and robust across specifications. These findings suggest that broad, practice-based AES may not deliver immediate, measurable climate benefits at the farm level, either because effects take longer to materialize or because current schemes are insufficiently targeted to high-emission sources. Policies that combine more precise targeting, climate-specific measures, and long-term monitoring may be needed to unlock the full climate mitigation potential of AES.
Ključne besede: agri-environmental schemes, greenhouse gas emissions, difference-in-differences, agricultural policy evaluation, Slovenia
Objavljeno v RUP: 13.04.2026; Ogledov: 210; Prenosov: 10
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3. Cubes of symmetric designsVedran Krčadinac, Mario Osvin Pavčević, Kristijan Tabak, 2025, izvirni znanstveni članek Opis: We study n-dimensional matrices with {0, 1}-entries (n-cubes) such that all their 2-dimensional slices are incidence matrices of symmetric designs. A known construction of these objects obtained from difference sets is generalized so that the resulting n-cubes may have inequivalent slices. For suitable parameters, they can be transformed into n-dimensional Hadamard matrices with this property. In contrast, previously known constructions of n-dimensional designs all give examples with equivalent slices.
Ključne besede: symmetric design, difference set, Hadamard matrix
Objavljeno v RUP: 21.10.2025; Ogledov: 442; Prenosov: 1
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4. Assessing the economic effects of agri-environmental schemes on farm input useImre Fertő, Štefan Bojnec, 2025, objavljeni povzetek znanstvenega prispevka na konferenci (vabljeno predavanje) Opis: . This study assesses the economic impacts of agri-environmental schemes (AES) on farm-level input expenditures, particularly fertilizers, crop protection products, and energy, in Hungary from 2014 to 2020. Employing advanced econometric methodologies, including Synthetic Difference-inDifferences (SDID), Synthetic Control (SC), and traditional Difference-in-Differences (DiD), the analysis addresses the complex challenges posed by staggered AES adoption and significant farm-level heterogeneity. The findings indicate no statistically significant overall change in expenditures for fertilizers, crop protection, and energy. Nonetheless, detailed temporal analysis reveals nuanced dynamics. During the initial phases of AES implementation, transitional inefficiencies are evident, indicating adaptation challenges and associated costs as farmers adjust to new environmental requirements. These initial costs stem from administrative burdens, the need for training, and investments in sustainable practices such as precision agriculture and integrated pest management (IPM). Over subsequent years, the results exhibit stabilization or slight increases in input expenditures rather than substantial cost savings. Such trends suggest that while AES may encourage environmentally sustainable farming practices, the expected economic benefits from reduced inputs—due to input substitution or increased efficiency—may not be immediate or uniformly achievable. Indeed, more precise and environmentally-friendly alternatives to traditional chemical inputs, despite their ecological advantages, can incur higher short-term costs. Further analysis highlights considerable heterogeneity in AES impacts across different farm sizes and adoption timing. Larger, more technologically advanced farms display a relatively smaller incremental cost increase, benefiting from economies of scale and superior resource access, yet these differences are minor and statistically inconclusive. Early adopters, defined as farms participating in AES from the scheme’s initial stages, showed no systematic economic advantage or disadvantage compared to later adopters, indicating a consistent adaptation pattern across all participating farms. Robustness checks, including random treatment falsification tests and analyses on never-treated farms, reinforce the credibility of the findings, affirming that observed AES impacts genuinely reflect causal relationships rather than selection biases or confounding factors. The study concludes that the complex interplay between policy design, farm structure, market dynamics, and adaptation processes can obscure immediate economic outcomes. Therefore, it underscores the need for more tailored AES interventions that consider farm-specific constraints, transitional costs, and longterm adaptation dynamics. Additionally, integrating broader sustainability indicators—biodiversity, soil quality, and resilience metrics—could yield a more comprehensive evaluation of AES efficacy. This research contributes important empirical evidence to ongoing discussions regarding the economic viability and environmental effectiveness of AES within diverse agricultural landscapes. Policymakers are encouraged to account for initial adaptation phases, support targeted technological and management innovations, and embrace regionally customized strategies to optimize both ecological and economic outcomes of AES policies.
Ključne besede: agri-environmental schemes, input expenditures, synthetic difference-in-differences, policy evaluation
Objavljeno v RUP: 18.08.2025; Ogledov: 756; Prenosov: 4
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5. Partial geometries with regular automorphism groups : master’s thesisAdisa Hodžić, 2024, magistrsko delo Ključne besede: (near-) linear space, projective plane, affine plane, partial geometry, generalized quadrangle, strongly regular graph, partial difference set, automorphism group
Objavljeno v RUP: 25.12.2024; Ogledov: 2227; Prenosov: 50
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6. On the balanced upper chromatic number of finite projective planesZoltán L. Blázsik, Aart Blokhuis, Štefko Miklavič, Zoltán Lóránt Nagy, Tamás Szőnyi, 2021, izvirni znanstveni članek Ključne besede: projective planes, balanced upper chromatic number, difference sets, planar functions, probabilistic method
Objavljeno v RUP: 18.01.2021; Ogledov: 2881; Prenosov: 41
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7. Full characterization of generalized bent functions as (semi)-bent spaces, their dual, and the Gray imageSamir Hodžić, Wilfried Meidl, Enes Pašalić, 2018, izvirni znanstveni članek Ključne besede: generalized bent functions, Zq-bent functions, Gray maps, dual of generalized bent function, relative difference sets
Objavljeno v RUP: 08.06.2018; Ogledov: 3817; Prenosov: 106
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8. Karakterizacija posplošnih zlomljenih funkcij in nekatere druge kriptografske teme : doktorska disertacijaSamir Hodžić, 2017, doktorska disertacija Ključne besede: generalized bent functions, Zq-bent functions, Gray maps, (relative) difference sets, (generalized) Marioana-McFarland class, stream ciphers, filtering generator, guess and determine cryptanalysis, tap positions, (fast) algebraic attacks, algebraic immunity, derivatives, linear structures, planar mappings
Objavljeno v RUP: 09.11.2017; Ogledov: 4571; Prenosov: 67
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9. Distance-regular Cayley graphs on dihedral groupsŠtefko Miklavič, Primož Potočnik, 2005, izvirni znanstveni članek Opis: The main result of this article is a classification of distance-regular Cayley graphs on dihedral groups. There exist four obvious families of such graphs, which are called trivial. These are: complete graphs, complete bipartite graphs, complete bipartite graphs with the edges of a 1-factor removed, and cycles. It is proved that every non-trivial distance-regular Cayley graph on a dihedral group is bipartite, non-antipodal, has diameter 3 and arises either from a cyclic di#erence set, or possibly (if any such exists) from a dihedral difference set satisfying some additional conditions. Finally, all distance-transitive Cayley graphs on dihedral groups are determined. It transpires that a Cayley graph on a dihedral group is distance-transitive if and only if it is trivial, or isomorphic to the incidence or to the non-incidence graph of a projective space ▫$\mathrm{PG}_{d-1} (d,q)$▫, ▫$d \ge 2$▫, or the unique pair of complementary symmetric designs on 11 vertices.
Ključne besede: mathematics, grah theory, distance-regular graph, distance-transitive graph, Cayley graph, dihedral group, dihedrant, difference set
Objavljeno v RUP: 10.07.2015; Ogledov: 5345; Prenosov: 118
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10. Distance-regular Cayley graphs on dihedral groupsŠtefko Miklavič, Primož Potočnik, 2007, izvirni znanstveni članek Opis: The main result of this article is a classification of distance-regular Cayley graphs on dihedral groups. There exist four obvious families of such graphs, which are called trivial. These are: complete graphs, complete bipartite graphs, complete bipartite graphs with the edges of a 1-factor removed, and cycles. It is proved that every non-trivial distance-regular Cayley graph on a dihedral group is bipartite, non-antipodal, has diameter 3 and arises either from a cyclic di#erence set, or possibly (if any such exists) from a dihedral difference set satisfying some additional conditions. Finally, all distance-transitive Cayley graphs on dihedral groups are determined. It transpires that a Cayley graph on a dihedral group is distance-transitive if and only if it is trivial, or isomorphic to the incidence or to the non-incidence graph of a projective space ▫$\mathrm{PG}_{d-1} (d,q)$▫, ▫$d \ge 2$▫, or the unique pair of complementary symmetric designs on 11 vertices.
Ključne besede: mathematics, grah theory, distance-regular graph, distance-transitive graph, Cayley graph, dihedral group, dihedrant, difference set
Objavljeno v RUP: 15.10.2013; Ogledov: 6323; Prenosov: 107
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