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1.
Honey, there´s something on my mind --- : adverse consequences of negative and positive work rumination on attention to the partner, and the advantage of talking about it
Julia Schoellbauer, Sara Tement, Christian Korunka, 2023, izvirni znanstveni članek

Opis: In the contemporary 24/7 working society, the separation of work and private life is increasingly turning into an unrealizable ideal. Ruminating about work outside the work context lets work spill over into private lives and afects the dynamics of workers’ private relationships. Although negative work rumination was linked to couples’ reduced relationship satisfaction, little is known about the mechanism of action and the impact of positive work rumination. Drawing on the load theory of selective attention, we hypothesize that both negative and positive work rumination occupy attentional resources and thus reduce workers’ attention to the partner on the same day. Lower levels of attention to the partner, in turn, should relate to lower levels of both partners’relationship satisfaction. However, sharing the work-related thoughts with the partner might support the resolution of the work issue the worker is ruminating about, which releases attentional resources and thus bufers the negative association between rumination and attention to the partner. We conducted a daily diary study and the fndings based on 579 daily dyadic observations from 42 dualearner couples support the proposed cognitive spillover-crossover mechanism and the bufer mechanism of thought-sharing. We conclude that negative and positive work rumination takes up scarce attentional resources and thus jeopardizes relationship quality. However, sharing thoughts with one’s partner seems to be a useful strategy for couples to maintain or even increase their relationship satisfaction in the light of work rumination.
Ključne besede: Diary study, Dyadic research, Relationship quality, Psychological availability, Spillover-crossover, Actor-partner interdependence mode, family conflict, perceptual load, relationship satisfaction, marital, quality, daily-diary, couples, stress, experiences depression, crossover, Psychology
Objavljeno v DKUM: 20.02.2024; Ogledov: 47; Prenosov: 1
.pdf Celotno besedilo (989,06 KB)
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2.
Effect of residual stresses on fatigue strength on the smooth and splined parts of spring torsion bars
Vinko Močilnik, Jožef Predan, Nenad Gubeljak, 2023, izvirni znanstveni članek

Opis: The article discusses the effect of residual stresses on the fatigue strength of torsion bars by using the Dang Van fatigue criterion, at the stress concentration at the root of the tooth and at the smooth part of the torsion bar. Residual compressive stresses were induced on the surface during the technological processes by cold surface rolling and torsional pre-strain (pre-setting) to the plastic range, to increase the elastic linear range and to reduce the stress state during torsional loading. Normally, the stress reduction in the torsion bar at the mounting point is provided by the increased diameter of the splined part, compared to the smooth part of the torsion bar. In the case of a small difference between the diameter of the splined and the smooth parts of the torsion bar, a fatigue crack can be initiated in the notch, which causes the torsion bar to break during operation after a few hundred loading cycles. FEM stress analysis of a torsion bar was performed in the article. The actual residual stresses were measured by the non-destructive X-ray method at the place of stress concentration on the smooth and splined parts with a notch of the torsion bar, and Dang Van’s failure criterion was used to determine the fatigue behavior during torsional loading. Therefore, in the paper, the three methods were combined to determine the optimum lifetime of a torsion bar exposed to the required cyclic torque. The results of the analysis showed that the residual compressive stresses are useful up to a certain limit where the retarded fatigue crack initiation occurred, but a further increase of compressive stress caused an increase of the maximum shear stresses, which, in turn, caused the initiation of fatigue and failure at the splined part of the torsion bar before achieving the required number of cycles.
Ključne besede: Dang Van fatigue criterion, torsion bars, pre-setting, high-cycle fatigue, residual stress
Objavljeno v DKUM: 30.11.2023; Ogledov: 198; Prenosov: 10
.pdf Celotno besedilo (7,29 MB)
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3.
International transmission of conventional and unconventional monetary policy and financial stress shocks from the euro area to Russia
Silvo Dajčman, Alenka Kavkler, Sergey Merzlyakov, Sergey E. Pekarski, Dejan Romih, 2022, izvirni znanstveni članek

Opis: This paper studies the international transmission of the euro area´s monetary policy and financial stress to Russia. The results show that financial stress in the euro area damages Russian economic activity and stock prices, but not its trade balance. The contractionary euro area monetary policy shock decreases Russian GDP, leads to real appreciation of the euro against the Russian rouble, damages Russian stock prices, but does not significantly affect the trade balance between countries. We also found that the Central Bank of the Russian Federation adjusts to monetary policy shocks in the euro area.
Ključne besede: conventional monetary policy, unconventional monetary policy, financial stress, Russia, international transmission
Objavljeno v DKUM: 26.09.2023; Ogledov: 244; Prenosov: 19
.pdf Celotno besedilo (1,85 MB)
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4.
The effect of the Ala16Val mutation on the secondary structure of the manganese superoxide dismutase mitochondrial targeting sequence
Matic Broz, Veronika Furlan, Samo Lešnik, Marko Jukič, Urban Bren, 2022, izvirni znanstveni članek

Opis: Manganese Superoxide Dismutase (MnSOD) represents a mitochondrial protein that scavenges reactive oxygen species (ROS) responsible for oxidative stress. A known single nucleotide polymorphism (SNP) rs4880 on the SOD2 gene, causing a mutation from alanine to valine (Ala16Val) in the primary structure of immature MnSOD, has been associated with several types of cancer and other autoimmune diseases. However, no conclusive correlation has been established yet. This study aims to determine the effect of the alanine to valine mutation on the secondary structure of the MnSOD mitochondrial targeting sequence (MTS). A model for each variant of the MTS was prepared and extensively simulated with molecular dynamics simulations using the CHARMM36m force field. The results indicate that the alanine variant of the MTS preserves a uniform α-helical secondary structure favorable for the protein transport into mitochondria, whereas the valine variant quickly breaks down its α-helix. Thus, the alanine MTS represents the more active MnSOD variant, the benefits of which have yet to be determined experimentally.
Ključne besede: manganese superoxide dismutase, polymorphism rs4880, mutation Ala16Val, molecular dynamics simulations, oxidative stress
Objavljeno v DKUM: 21.08.2023; Ogledov: 229; Prenosov: 9
.pdf Celotno besedilo (5,14 MB)
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5.
Validation of boundary element method for assessment of weld joints accounting for notch stress : magistrsko delo
Rok Skerbiš, 2022, magistrsko delo

Opis: Robust, automated mesh generation on arbitrary weld joint geometries, using finite element method (FEM) is a problematic task. It was previously discovered, that an arbitrary weld joint geometry can be parameterized inside a CAD environment [1], however when it comes to domain discretization and boundary conditions assignment, the parameterized approach becomes too demanding inside FEM. This results in long FEM model preparation times and sometimes in problems with the parametric model itself, which leads to a need for an additional numerical method - boundary element method (BEM), which overcomes this issue and is beneficial in this case. BEM is a numerical method, that in addition to other applications finds a use in the elasto-mechanic problems, where the only concern is the boundary of the considered geometric domain. Since notch stress calculations of weld joints fall into this category, their calculation can be carried out with it. Since there is not much available information on whether or not such calculations are a suitable alternative for the currently used FEM, this thesis had to be confirmed through a structured and step by step procedure. First, a notch mesh quality study has been made, then other entities followed. It was discovered that BEM is applicable to the problem and capable of calculating results with sufficient quality. Furthermore, the parameter driven approach and automated calculation provide for additional advantageous potentials.
Ključne besede: weld joint, boundary element method, finite element method, spatial discretization, notch stress
Objavljeno v DKUM: 02.11.2022; Ogledov: 400; Prenosov: 0
.pdf Celotno besedilo (4,62 MB)

6.
ǂThe ǂimpact of climate change on urban thermal environment dynamics
Igor Žiberna, Nataša Pipenbaher, Daša Donša, Sonja Škornik, Mitja Kaligarič, Lučka Kajfež-Bogataj, Zalika Črepinšek, Jaša Veno Grujić, Danijel Ivajnšič, 2021, izvirni znanstveni članek

Opis: The human population is increasing. The ongoing urbanization process, in conjunction with climate change, is causing larger environmental footprints. Consequently, quality of life in urban systems worldwide is under immense pressure. Here, the seasonal characteristics of Maribor's urban thermal environment were studied from the perspectives of surface urban heat island (SUHI) and urban heat island (UHI) A remote sensing thermal imagery time series and in-situ measurements (stationary and mobile) were combined with select geospatial predictor variables to model this atmospheric phenomenon in its most intensive season (summer). Finally, CMIP6 climate change scenarios and models were considered, to predict future UHI intensity. Results indicate that Maribor's UHI intensity maximum shifted from winter to spring and summer. The implemented generalized additive model (GAM) underestimates UHI intensity in some built-up parts of the study area and overestimates UHI intensity in green vegetated areas. However, by the end of the century, UHI magnitude could increase by more than 60% in the southern industrial part of the city. Such studies are of particular concern, in regards to the increasing frequency of heat waves due to climate change, which further increases the (already present) heat stress in cities across the globe.
Ključne besede: urbanizacija, mestni toplotni otoki, poletni vročinski stres, GAM, CMIP6, urbanisation, urban heat island, summer heat stress
Objavljeno v DKUM: 02.09.2022; Ogledov: 518; Prenosov: 17
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7.
The psychodynamic processes related to the involvement in peacekeeping missions : experiences of Slovenian police officers
Branko Lobnikar, Špela Vesel, Emanuel Banutai, 2011, izvirni znanstveni članek

Opis: Purpose: The purpose of this paper is to review the decade of Slovenian police officer’s experiences with international peacekeeping operations. The main goal of police officers, involved in these missions, is to prevent conflicts between opposite sites, to implement basic agreements, protect humanitarian missions and reinforce policing operations in the conflict area. The purpose of the paper is to acknowledge the lessons learned while planning and implementing further cooperation of Slovenian police officers in peacekeeping (police) operations. The main purpose of the paper is to analyze the consequences of deployment to peacekeeping missions for police officers as well as their family members (partners and children) by analyzing the psychodynamic processes related to the involvement in peacekeeping missions. Design/Methods/Approach: The paper is based on the review of literature. The empirical part of the paper presents the results of the research on a small sample of police officers (n = 36) and their family members (n = 25 partners + 35 children). Findings: Police peacekeepers should be well prepared for different stress situations; they are exposed to various stress factors before, during, and after serving in a mission. That is why training and reintegration programmes are of great importance. We establish that respondents assess that deployment to a peacekeeping mission has a positive and negative impact on the relationships between family members. As many as ¾ of mission members believe deployment can have a positive impact above all in the sense of strengthening the emotional ties between partners, increased mutual trust and strengthening of the partnership. For them, deployment to a peacekeeping mission is a challenge and personal experience, which can change the way they see the world. 2/3 of partners state similar positive impacts and they also believe that there is more trust between the partners after the experience with the peacekeeping mission, they treasure their time together and thus represent bigger support for each other in difficult times. As the most common problem, respondents perceived marital problems and the occurrence of negative feelings among family members (anger, avoidance, judgment ...). A large share of respondents stressed problems with children. 43.8% of respondents also named depression as a problem. Research limitations/implications: The findings are limited to the Slovenian police and their police officer’s experiences, serving in various police peacekeeping missions and their family members. Practical implications: Based on lessons learned this paper complements the results of different surveys of the researched topic. The results cannot be completely generalized, although some findings could also be useful to similar police organizations in Europe. Originality/Value: This paper addresses and explores different small scale surveys, conducted on sampled Slovenian police officers who served in peacekeeping missions and their family members. Findings could be of interest for the general as well as expert audience.
Ključne besede: police, police officer’s family, peacekeeping missions, Slovenia, stress, training and reintegration programmes, SE Europe
Objavljeno v DKUM: 05.05.2020; Ogledov: 1041; Prenosov: 55
.pdf Celotno besedilo (624,54 KB)
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8.
Personality profiles and stress-coping strategies of Slovenian military pilots
Maja Meško, Damir Karpljuk, Mateja Videmšek, Iztok Podbregar, 2009, izvirni znanstveni članek

Opis: The performance of a pilot also depends on the pilot's personality profile and their stresscoping style. In our study we aimed to analyze, by means of the Big Five Questionnaire (BFQ) and the Coping Responses Inventory (CRI), the personality profiles, stress-coping strategies and the relationship between them among Slovenian military pilots. The study involved 120 respondents: 30 of whom were military pilots in the experimental group, while the other 90 were in the control groups. The control groups included sport pilots, the general population and soldiers with no involvement in aviation. The members of the control group were selected with regard to the characteristics of the experimental group members, so that both groups were equivalent in terms of relevant factors (e.g. gender, age, health state, level of education etc), thus participating in a study of equivalent pairs. A statistical analysis identified statistically significant differences between the groups in the following BFQ dimensions: energy, conscientiousness and emotional stability; in the dimensions of CRI 'cognitive avoidance' (cognitive effort to avoid realistic consideration of a problem); and 'emotional discharge or emptying' (behavioural attempts to alleviate tension by venting negative emotions). Results revealed that certain personality characteristics were differentially and significantly related to specific stress coping strategies adopted by military pilots.
Ključne besede: military pilots, Slovenia, personality, personality traits, coping behavior, coping, stress
Objavljeno v DKUM: 19.03.2020; Ogledov: 931; Prenosov: 28
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9.
Influence of temperature on epigenetic changes of common duckweed (Lemna minor L.) in aseptic culture
Stella Prelovšek, 2018, magistrsko delo

Opis: Epigenetics is a study of heritable changes in gene expression and function that do not change the DNA sequence itself. One of the commonly described epigenetic modifications is DNA methylation where a methyl group is added to the fifth carbon of the cytosine (Lim & Maher, 2010). This may lead to gene silencing, regulation of gene expression and allows for plant plasticity to changing environment (Verhoeven et al., 2010). Epigenetic variation is often studied in species with asexual reproduction, due to the absence of genetic variation between individuals and because clonal species do not go through a germline and meiosis between generations which epigenetic resetting occurs. Lemna minor, also known as common duckweed, is the smallest flowering macrophyte that consist of modified leaf structures (fronds) and one hanging root. It is known for its rapid asexual reproduction (Ziegler et al., 2015). Daughter fronds are genetically identical to the mother plant and are produced without involvement of male or female germlines. Fast asexual reproduction makes Lemna minor a perfect candidate to study epigenetic effects of de novo gene regulatory evolution. The aim of this project is to screen divergence of environmentally-induced DNA methylation between different experimental treatments over multiple generations. The aim of this project is to screen divergence of temperature-induced DNA methylation between different experimental treatments over multiple generations. Results show that, temperature stress has a strong influence on L. minor growth and reproduction, and induces significant change in the DNA methylation in the CG and CHG methylation context. Temperature-induced DNA methylation was inherited over multiple clonal generation of L. minor in the CHG contexts, although since we did not detect any performance difference the functional consequences of this DNA methylation are unclear. This study contributes to the knowledge of environmentally-induced DNA methylation changes, which is essential regarding the increasing frequency of global climate changes.
Ključne besede: DNA methylation, duckweed, epigenetics, epiGBS, abiotic stress, transgenerational inheritance, asexual reproduction
Objavljeno v DKUM: 29.01.2019; Ogledov: 1458; Prenosov: 127
.pdf Celotno besedilo (2,81 MB)

10.
Work-Home conflict and strain: the role of work-related smartphone use, job insecurity and segmentation preferences
Tjaša Srnko, 2018, magistrsko delo

Opis: Nowadays, through organisational and technological changes, organizations expect availability and work from their employees not just during working hours, but also in their free time. Work can be done from anywhere and at any time, also with the help of smartphones, which is one of the main constructs of the current research. If the employee is working from home on their smartphone, this can have an important contribution to managing work and private life, and also to strain. The individual’s preference of whether to segment his or her work from home also plays an important role in experiencing internal conflicts. As the motivation for work-related smartphone use is not fully clear, job insecurity was additionally explored as a potential predictor. In an online study, conducted in Austria, we collected data from 454 participants of different ages, gender and working backgrounds. For the analysis, multiple moderated regression and mediation analyses were used. Results showed significant relations between work-home interference and strain but no significant results between those constructs while adding work-related smartphone use. Segmentation preferences did not have an influence on the relationship between work-home interference and strain. Job insecurity was revealed to be related to work-related smartphone use and smartphone use to work-home interference. Smartphone use was also found to partially mediate the path from job insecurity to work-home interference. Finally, to prevent negative outcomes of strain, work-home interference and job insecurity, organizations should focus on: providing culture that fits their employees, try to plan availability free time and provide a clear communication.
Ključne besede: Smartphone use, work-home interference, strain, stress, job insecurity, segmentation preferences
Objavljeno v DKUM: 14.01.2019; Ogledov: 1599; Prenosov: 126
.pdf Celotno besedilo (863,72 KB)

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