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Ljubljana-Leoben graph theory seminar
2017, druge monografije in druga zaključena dela

Opis: The booklet contains the abstracts of the talks given at the 30th Ljubljana-Leoben Graph Theory Seminar that was held at the Faculty of Natural Sciences and Mathematics in Maribor between 13-15 September, 2017. The seminar attracted more than 30 participants from eight countries, all of which are researchers in different areas of graph theory. The topics of the talks encompass a wide range of contemporary graph theory research, notably, various types of graph colorings (b-coloring, packing coloring, edge colorings), graph domination (rainbow domination, Grundy domination, graph security), distinguishing problems, algebraic graph theory, graph algorithms, chemical graph theory, coverings, matchings and also some classical extremal problems. Beside the abstracts of the four invited speakers (Csilla Bujtás, Premysl Holub, Jakub Przybyło, Zsolt Tuza), the booklet contains also the abstracts of 18 contributed talks given at the event.
Ključne besede: mathematics, discrete mathematics, graph theory, Ljubljana-Leoben seminar, Maribor, Slovenia
Objavljeno: 08.12.2017; Ogledov: 247; Prenosov: 36
.pdf Celotno besedilo (457,62 KB)
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Type II string theory on Calabi-Yau manifolds with torsion and non-Abelian discrete gauge symmetries
Volker Braun, Mirjam Cvetič, Ron Donagi, Maximilian Poretschkin, 2017, izvirni znanstveni članek

Opis: We provide the first explicit example of Type IIB string theory compactification on a globally defined Calabi-Yau threefold with torsion which results in a four-dimensional effective theory with a non-Abelian discrete gauge symmetry. Our example is based on a particular Calabi-Yau manifold, the quotient of a product of three elliptic curves by a fixed point free action of Z(2) x Z(2). Its cohomology contains torsion classes in various degrees. The main technical novelty is in determining the multiplicative structure of the (torsion part of) the cohomology ring, and in particular showing that the cup product of second cohomology torsion elements goes non-trivially to the fourth cohomology. This specifies a non-Abelian, Heisenberg-type discrete symmetry group of the four-dimensional theory.
Ključne besede: string field theory, conformal field models, string theory, discrete symmetries
Objavljeno: 08.03.2018; Ogledov: 475; Prenosov: 170
.pdf Celotno besedilo (355,78 KB)
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Discrete symmetries in Heterotic/F-theory duality and mirror symmetry
Mirjam Cvetič, Antonella Grassi, Maximilian Poretschkin, 2017, izvirni znanstveni članek

Opis: We study aspects of Heterotic/F-theory duality for compactifications with Abelian discrete gauge symmetries. We consider F-theory compactifications on genus-one fibered Calabi-Yau manifolds with n-sections, associated with the Tate-Shafarevich group Z(n). Such models are obtained by studying first a specific toric set-up whose associated Heterotic vector bundle has structure group Z(n). By employing a conjectured Heterotic/F-theory mirror symmetry we construct dual geometries of these original toric models, where in the stable degeneration limit we obtain a discrete gauge symmetry of order two and three, for compactifications to six dimensions. We provide explicit constructions of mirror-pairs for symmetric examples with Z(2) and Z(3), in six dimensions. The Heterotic models with symmetric discrete symmetries are related in field theory to a Higgsing of Heterotic models with two symmetric abelian U(1) gauge factors, where due to the Stuckelberg mechanism only a diagonal U(1) factor remains massless, and thus after Higgsing only a diagonal discrete symmetry of order n is present in the Heterotic models and detected via Heterotic/F-theory duality. These constructions also provide further evidence for the conjectured mirror symmetry in Heterotic/F-theory at the level of fibrations with torsional sections and those with multi-sections.
Ključne besede: discrete symmetries, F-theory, string duality, superstrings, heterotic strings
Objavljeno: 08.03.2018; Ogledov: 471; Prenosov: 160
.pdf Celotno besedilo (510,30 KB)
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Rural geography in Slovenia
Stanko Pelc, Vladimir Drozg, 2009, pregledni znanstveni članek

Opis: The paper shows an overview of theoretical and conceptual directions in Slovene Rural Geography. The first part of the paper deals with the changes in understanding of the term rural area, and the second part discusses some theoretical concepts. The last chapter provides an overview of the most often researched topics in the field of Rural Geography in Slovenia.
Ključne besede: rural geography, theory of geography, Slovenia
Objavljeno: 19.03.2018; Ogledov: 110; Prenosov: 27
.pdf Celotno besedilo (114,76 KB)
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Urbanisation, urban environmental quality, national socio-economic conditions and diseases burden in Africa
Richard Ingwe, 2013, izvirni znanstveni članek

Opis: The investigation of socio-economic, political and environmental aspects of urbanization in Africa is gaining research attention. Most recently, information on the patterns in urbanization, population growth, slumisation, among other aspects of urban Africa within the past quarter of a century or thereabout were reported. While this report elucidated on the relevant challenges, it was restricted to the regional patterns of the variables investigated. This report indicates that more information on the sub-regional aspects of these variables is required to elucidate on urban planning in the region and its sub-regions. Here, the ways forward in investigating these issues and variables underlying them are outlined. The theoretical, methodological, spatial and temporal aspects or requirements of the proposed research are discussed to provide a compass for future research.
Ključne besede: urbanization, population dynamics, Africa, sub-regions, socio-economic conditions, environment, theory, method, slumisation
Objavljeno: 10.04.2018; Ogledov: 332; Prenosov: 32
.pdf Celotno besedilo (301,56 KB)
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Individual's resistance regarding BPM initiative
Mirjana Pejić Bach, Vesna Bosilj-Vukšić, Daila Suša-Vugec, 2017, izvirni znanstveni članek

Opis: Though the individual’s resistance is very often considered a significant barrier to BPM success, the literature on that topic is quite scarce. With the aim to shed light on this topic, we have conducted research of a Croatian insurance company. We examined the impact of individual’s resistance regarding BPM initiative using the theory of reasoned action. Structural equation model was developed using the data collected by the survey among company employees. The results indicate that subjective norms are positively related to the individual’s resistance regarding BPM initiative, while positive initial belief regarding BPM initiative tends to decrease the probability of resistance to change.
Ključne besede: business process management, theory of reasoned action, individual’s resistance, insurance company, change management, Croatia
Objavljeno: 03.05.2018; Ogledov: 148; Prenosov: 61
.pdf Celotno besedilo (837,86 KB)
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Neoliberal metaphor as a quasi-economic paradigm in function of vulgarized institutional monism and an experiment of interest
Veselin Drašković, 2014, znanstvena monografija

Opis: We live in a time that according neoliberalism (as an ideology, doctrine, philosophy, theory and metaphor) in global and local boundaries manifests itself as an immoral, inhumane, brutal, chaotic, crisis and hegemonic system (order) of power, governance, violence, exploitation and greed. This is the time when everything is relativized, thanks to neoliberalism, paradoxically and ironically, due to interests and rhetorical absolutism of freedom and market. The reason for writing this manuscript is not just analysis, explanation and critique of neoliberalism and its forms, but also the cause of its evolution towards vulgarized quasi-neoliberal model. The aim of this manuscript is to point out: - neoliberal causes of the permanent and crisis transition, which caused major problems and deformities, and created a new dogma with uncertain lifetime, - inadequate civilizational environment, etatistic tradition and the creation of a quasi-institutional conditions that have enabled the introduction of new elitist (to a certain extent and sense of totalitarian) system under the mask of neoliberalism, - the fact that forcing of quasi-neoliberalism is a privilege of unreasonable and/or highly interest oriented “reformists”, because delaying changes means delaying development, - the difference between rhetoric and practice, ie. between the story of liberal democracy (which promotes the rights of individuals, human and social freedoms and human rights, as opposed to collectivism, totalitarianism and authoritarian policies) and quasi-neoliberal economic policies (global and transitional), that were dominant worldwide and paradoxically violates all liberal principles, and e) the use of state as a screen for expressing expansive nomenclature interests and non-market appropriation of its significant resources. The aim is to point to the existence and functioning of the vicious circle of crisis (global and transitional), created by the following relation: theoretical neoliberalism as an institutional monism – its vulgarization, dogmatisation and subjectivity in practice – through manifestation of freedom of operation and connectivity of supranational and national elites – tycoonisation and the criminalization of the economy and society – reproduction of the crisis. This article is not written to point out the culprits or their recognition, but only the phenomenological and ontological critique of quasi-institutional monism and advocating the institutional pluralism, which I believe is civilizational and development imperative. For the purpose of warning, this manuscript suggests a critical review and consideration of ending (eliminating) the abuse of neoliberal theoretical concepts into practical interest purposes, ending a deadly, sophisticated and dogmatic neoliberal metaphor for numerous national and state troubles and anti-developmental contradictions. I came to the conclusion that neoliberalism is merely a metaphor that conceptually generates a conglomerated complex and contradictory context, which has its own doctrinal, terminological, institutional, developmental, cognitive, strategic, interest, redistributive, ownership, civilizational, geopolitical and ideological meaning and numerous practical quasi-manifestations.
Ključne besede: neoliberalism, quasi-neoliberal model, crisis, quasi-institutional monism, institutional pluralism, economic theory
Objavljeno: 08.05.2018; Ogledov: 184; Prenosov: 49
.pdf Celotno besedilo (921,75 KB)
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Analytical method for the analysis of stone-columns according to the Rowe dilatancy theory
Boštjan Pulko, Bojan Majes, 2006, izvirni znanstveni članek

Opis: In this paper a new analytical method to analyse the behaviour of rigid foundations stabilized by end bearing stone-columns is proposed. The stone column and the surrounding soil are treated in axial symmetric conditions as a unit cell. The stone column is assumed to behave as an Mohr-Coulomb rigid-plastic material with non-associative flow rule according to the Rowe stress dilatancy theory and the soil as an elastic material. These common assumptions, combined with equilibrium and kinematic conditions, lead to the simple analytical closed-form solution for the prediction of the behaviour for rigid footings resting on stone-column reinforced ground. The parametric study is presented to show the effect of dilatancy of the granular material on the deformations and stresses in the ground and its beneficial effect on settlement reduction. The results of the new method are compared with some already known analytical methods and some published field test results and observations.
Ključne besede: ground improvement, stone columns, ground settlements, dilatancy theory
Objavljeno: 17.05.2018; Ogledov: 236; Prenosov: 23
.pdf Celotno besedilo (307,66 KB)
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Design of geometry and numerical simulation of the operating characteristic of the rotor of the wind turbine
aljaž Janič, 2018, diplomsko delo

Opis: The diploma thesis consists of design and numerical simulation of the wind turbine. Geometries are designed according to two theories, the Betz theory and the Schmitz theory. I used Solidworks for 3D modeling of the both rotors. Using Ansys software package, we performed numerical simulations of a rigid body for two different wind speed regimes. We were interested in the angular velocity of the spinning blades, which in combination with moment give us power.
Ključne besede: Renewable energy, wind energy, numerical simulation, wind turbine, blade design, Betz and Schmitz theory
Objavljeno: 09.08.2018; Ogledov: 318; Prenosov: 80
.pdf Celotno besedilo (2,19 MB)

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