Large-scale incorporation of new energy generation units based on renewable sources, such as wind and photovoltaic power, drastically alters the structure of the power system. Because of the intermittent nature of these sources, switching in grids (connection and disconnection) occurs much more frequently than with conventional sources. As a result, the power system will inevitably experience a large number of transients, which raises questions about the stability of the system and the quality of the electrical energy. Therefore, measuring various types of transients in power system is crucial for stability, power quality, fault analysis, protection design, and insulation design. Transient recorders that are currently used are generally expensive and only suitable for particular locations in power systems. The number of installed transient recorders is insufficient for a comprehensive analysis of problems that may occur. Hence, it is important to have inexpensive and efficient transient recorders that can be installed at multiple points in the power system on various types of objects. It is also essential to have a transient record database with open access, which can be used by researchers to develop new analysis techniques based on artificial intelligence. This paper proposes an inexpensive measurement and acquisition system designed to record transient phenomena on different objects within the power system. The system is designed to use autonomous power, a standardized data acquisition module, a low-budget system for transmitting recorded transient events to the server via mobile network, and a sensor system adapted to the object where transients are recorded. The proposed system is designed to be used for all types of objects in the power system where transients may occur, such as power lines, transmission towers, surge arresters, and transformers. All components of the system are described, and the system is tested under laboratory conditions. The modular nature of the system allows customization to the specifics of the location in power system by choosing appropriate components. The calibration method of the custom designed Rogowski coil is described. The cost analysis of the proposed system and power consumption analysis are performed. The results show that the system’s performance meets application requirements at a low cost.

The focus of the authors’ interest is the criminal offense of embezzlement in the service, which we classify in the catalogue of corrupt criminal offences, by its nature, operationalization method, consequences and other specificities. In addition, it is a criminal offense from the catalogue of premeditated criminal offenses, so the paper pays due attention to the interconnection and cumulative conditionality of objective and subjective elements, that is, the action of execution and the subjective component. Special attention is directed to the discovery of the existence of this criminal offense, i.e. the realistic discovery possibilities and capacities, then the objectivesubjective concept based on the legal description of this criminal offense, and the aspect of gathering the necessary evidence in connection with establishing the existence of the criminal offense and guilt, considering the restrictive legal requirements. The complexity of discovering and proving this criminal offense arises from the very nature of this criminal offense and certain specificities that are directly related to the way it is operationalized. The criminal law autonomy and independence, as well as the clear differentiation of this criminal offense in relation to other related criminal offences, are emphasized in order to avoid (possible) wrong identifications, and with the aim of a better and more comprehensive understanding of the very nature of this criminal offence

Abstract Islanded microgrids with low-inertia distributed energy resources (DERs) are prone to frequency fluctuations. With the increasing integration of DERs in microgrids, the complexity of control and stability has also increased. Moreover, the integration of DERs into microgrids may result in a power imbalance between energy supply and demand during sudden changes in load or energy generation. This can cause frequency variations in the microgrid, which could have disastrous consequences such as equipment damage or even blackouts. This paper proposes a control strategy to ensure the efficient operation of an islanded hybrid microgrid consisting of a PV generator, battery energy storage system (BESS), and emergency diesel generator. According to Energy Exchange Model proposed in this paper, the hybrid system presented operates independently without being connected to the electrical grid, where the PV system and BESS act as the main energy sources, while the emergency diesel generator provides active power backup with voltage and frequency regulation. The novel in this paper is also that DER aids in frequency regulation during active power transients by delivering and absorbing active power in accordance with the inverter's suggested P droop control strategy. In this way inverter droop control decreases system frequency nadir emulating so called “synthetic inertia”. To design both the islanded hybrid system and the proposed control strategy, the MATLAB/Simulink environment is utilized. Based on the results, it can be concluded that the analyzed microgrid system is capable of maintaining stability and operating efficiently in a range of operating conditions.

Abstract Voltage unbalance is common issue encountered in low voltage distribution networks, caused by uneven allocation of single-phase customers among phases. This paper analyses part of real low voltage distribution network in Bosnia and Herzegovina. The impact of single-phase customers and single-phase connected micro photovoltaic power plants (MPPP-s) were analysed. To reduce unbalance and improve voltage profiles, Phase Balance Optimization toolbox in DIgSILENT PowerFactory software was performed in six scenarios with different distribution of customers and different percentage of penetration of MPPS-s. The aim was to find method with least number of changes in customer and photovoltaic phase connection that fits within defined limits of voltage variations and voltage unbalance of European standard for power quality (EN 50160). Conclusion is that MPPP-s cause voltage increases in the network, as well as an increase in voltage unbalance, but these effects can be mitigated by proper distribution of customer loads and MPPS-s among phases.

This paper is about the parameter identification of an energy based hysteresis model from measurements by employing automatic differentiation and neural networks. We first introduce the energy based hysteresis model and the parameters which are to be identified. Then we show how the model can benefit from automatic differentiation. After that we incorporate a parametrization of the energy based hysteresis model via distribution functions and identify the parameters of the distribution function. Then, the hysteresis model is sampled and the generated datasets are used to train neural networks to predict the hysteresis parameters. The described methods are tested and verified on synthetic as well as measurement data.

Abstract In the dynamic field of power systems, integrating distributed generation (DG) sources like solar photovoltaic (PV) plants is crucial for enhancing reliability and fostering sustainability. However, this integration poses voltage profile management challenges in electrical grids. This study investigates voltage profile optimization in Bosnia and Herzegovina’s Gračanica network, focusing on a medium voltage feeder with 68 buses. Using DIgSILENT PowerFactory software, six scenarios with different configurations of solar plants are analyzed for their impact on voltage profiles and power losses. Results show that while DG integration offers benefits, incorrect sizing or placement can increase power losses. Optimal DG benefits are linked to specific sizes and locations. This research emphasizes the need for balancing PV generation with load demands and provides insights for optimal PV plant size and output to minimize negative impacts. These findings aid energy planners and policymakers in implementing distributed solar PV in medium voltage networks.

Open access implies the idea of scientific information dissemination over the Internet that is free to the end user. The higher education and university libraries’ mission is to connect people and information, and the goals of open access help librarians respond to users' information queries more quickly. This paper presents the basic concepts of open access with an emphasis on creating an open access journal through ten steps. The open access portal at the University of Sarajevo is also presented within the paper, as well.

Due to their exceptional properties and cost effectiveness, polyamides or nylons have emerged as widely used materials, revolutionizing diverse industries, including industrial 3D printing or additive manufacturing (AM). Powder-based AM technologies employ tonnes of polyamide microplastics to produce complex components every year. However, the lack of comprehensive toxicity assessment of particulate polyamides and polyamide-associated chemicals, especially in the light of the global microplastics crisis, calls for urgent action. This study investigated the physicochemical properties of polyamide-12 microplastics used in AM, and assessed a number of toxicity endpoints focusing on inflammation, immunometabolism, genotoxicity, aryl hydrocarbon receptor (AhR) activation, endocrine disruption, and cell morphology. Specifically, microplastics examination by means of field emission scanning electron microscopy revealed that work flow reuse of material created a fraction of smaller particles with an average size of 1-5 µm, a size range readily available for uptake by human cells. Moreover, chemical analysis by means of gas chromatography high-resolution mass spectrometry detected several polyamide-associated chemicals including starting material, plasticizer, thermal stabilizer/antioxidant, and migrating slip additive. Even if polyamide particles and chemicals did not induce an acute inflammatory response, repeated and prolonged exposure of human primary macrophages disclosed a steady increase in the levels of proinflammatory chemokine Interleukin-8 (IL-8/CXCL-8). Moreover, targeted metabolomics disclosed that polyamide particles modulated the kynurenine pathway and some of its key metabolites. The p53-responsive luciferase reporter gene assay showed that particles per se were able to activate p53, being indicative of a genotoxic stress. Polyamide-associated chemicals triggered moderate activation of AhR and elicited anti-androgenic activity. Finally, a high-throughput and non-targeted morphological profiling by Cell Painting assay outlined major sites of bioactivity of polyamide-associated chemicals and indicated putative mechanisms of toxicity in the cells. These findings reveal that the increasing use of polyamide microplastics may pose a potential health risk for the exposed individuals, and it merits more attention.

SUMMARY The aim of the study was to determine changes in body mass index (BMI) and in the prevalence of overweight and obesity in Serbian adult population. Data for this study were obtained from three National Health Interview Surveys, carried out as cross-sectional, nationally representative surveys in 2000, 2006 and 2013. The values of p for trends of sociodemographic and health related behavioral characteristics, of BMI distribution, and of overweight and obesity prevalence were determined by univariate and multivariate linear and logistic regression analyses, with year of survey as a continuous variable. The mean values of BMI and standard deviations in surveys were 26.09±3.92, 26.28±4.02 and 26.87±4.33 in men, and 25.91±5.25, 25.77±5.22 and 26.35±5.58 in women, respectively (trend p<0.001 both). The prevalence of obesity was 14.3%, 16.5% and 21.4% in men, and 20.0%, 19.7% and 23.3% in women, respectively (trend p<0.001 both). The prevalence of overweight did not change significantly during the observed period. In conclusion, the prevalence of obesity showed an increasing trend in both men and women, demanding targeted public health interventions.

BACKGROUND Epidemiological studies suggest that the maternal diet quality during pregnancy may influence the risk of neurodevelopmental disorders in the offspring. Here we investigated the associations between maternal intake of dietary fiber and ADHD symptoms in early childhood. METHODS We used longitudinal data of up to 21,852 mother-father-child trios (49.2% females) from the Norwegian Mother, Father, and Child Cohort Study. The relationships between maternal fiber intake during pregnancy and offspring ADHD symptoms at ages three, five, and eight years were examined using: a) multivariate regression (overall levels of ADHD symptoms), b) latent class analysis (subclasses of ADHD symptoms by sex at each age), and c) latent growth curves (longitudinal change in offspring ADHD symptoms). Covariates were ADHD polygenic scores in child and parents, total energy intake and energy-adjusted sugar intake, parental ages at birth of the child, and socio-demographic factors. RESULTS a) Higher maternal prenatal fiber intake was associated with lower offspring ADHD symptom scores at all examined ages (βage3=-0.14(95%CI -0.18, -0.10); βage5=-0.14(-0.19, -0.09); βage8=-0.14(-0.20, -0.09)). b) Of the derived low/middle/high subclasses of ADHD symptoms, fiber was associated with lower risk of belonging to middle subclass for boys and girls, and to high subclass for girls only (middle: ORboys 0.91(0.86-0.97)/ORgirls 0.86 (0.81-0.91); high ORgirls 0.82 (0.72-0.94)). c) Maternal fiber intake and rate of change in child ADHD symptoms across ages were not associated. CONCLUSIONS A low prenatal maternal fiber intake may increase symptom levels of ADHD in childhood, independently of genetic predisposition to ADHD, unhealthy dietary exposures, and socio-demographic factors.

BACKGROUND Regional wall motion abnormality (RWMA) is considered a sensitive and specific marker of ischemia during stress echocardiography (SE). However, ischemia is a multifaceted entity associated with either coronary artery disease (CAD) or angina with normal coronary arteries (ANOCA), a distinction difficult to make using a single sign. We aimed to evaluate the diagnostic potential of the ABCDE-SE protocol for CAD detection. METHODS From the 2016-2022 SE-2030 study data bank, we selected 3229 patients (age= 66±12 years, 2089, 65% males), with known CAD (n=1792) or ANOCA (n= 1437). All patients were studied with both ABCDE-SE protocol and with coronary angiography, within 3 months. Step A assesses RWMA; step B, B-lines/diastolic function; step C, left ventricular contractile reserve; step D, coronary flow velocity reserve (CFVR) in the left anterior descending artery; step E, heart rate reserve. RESULTS SE response ranged from score 0 (all steps normal) to score 5 (all steps abnormal) . In CAD, the rate of abnormal results was 347 for A (19.4%), 547 (30.5%) for B, 720 (40.2%) for C, 615 (34.3%) for D, and 633 (35.3%) for E step. In ANOCA, the rate of abnormal results was 81 (5.6%) for A, 429 (29.9%) for B, 432 (30.1%) for C, 354 (24.6%) for D, and 445 (31.0%) for E step. The dominant "solitary phenotype" was step B in 109 (9.1%) patients. CONCLUSION Stress-induced ischemia presents with a wide range of diagnostic phenotypes, highlighting its complex nature. Utilizing a comprehensive approach such as the advanced ABCDE score, which combines multiple markers, proves to be more valuable than relying on a single marker in isolation.

The appearance of asymmetric loading in the low voltage power distribution network has a negative effect on the voltage profile and power quality. In order to successfully analyze the conditions of the low voltage power supply, this paper presents simulated and analyzed voltage disturbances along the distribution network radial lines for the occurrence of different three-phase power system loading. In the simulation, the influence of asymmetric loading, section length and character of loads on the measured values is presented. The effects of distributed or concentrated loads at individual points of the power lines in terms of the voltage conditions improving were specifically considered.

Triterpenes are very important secondary metabolites with wide structural diversity and significant role in pharmacy and medicine.In the present research, a comparative study of pharamacological activities of the triterpene fractions obtained from several plant species belonging to Lamiaceae family, was carried out. In-vitro anti-proliferative activity was performed using a standardproliferation assay based on tetrazolium salts. In vitro anti-inflammatory activity of triterpene fractions was determined by an assay of inhibition of albumin denaturation. In general, the triterpene fractions obtained from plant species belonging to Lamiaceae family showed a strong anti-proliferative activity and anti-inflammatory activity.The triterpene fraction of Rosmarini folium showed the strongest anti-proliferative activity (GI50range from 4 to 37 μg/ml) and the strongest anti-inflammatory activity in the range from 57.27% to 80.69%. This comparative study provides scientific evidence to support the traditional use of Lamiacae plant species for medical purposes as anti-inflammatory and anti-proliferative medicines.

Previous research has established that during all phases of a crisis, people resort to different means of communication in order to get more information (McIntyre et al., 2012, Nelson et al., 2009, Lachlan et al., 2009), in order to reduce uncertainty ( Lachlan et al., 2010), and to gain a sense of control over the situation (Lachlan et al., 2016). At the beginning of the 21st century, mass communication is taking on new forms. The exponential growth and affirmation of the Internet as a very important channel for communication has minimized the influence of traditional media. Digitization processes, interactivity, multimedia, connection and networking of a large number of people and expediency in the dissemination of information enabled the wide use of social networks in times of crisis. In the first part of the paper, previous research on the use of social networks in crisis communication was synthesized, through the presentation of best practices for effective communication. The second part of the paper provides a detailed analysis of the use of social networks on the example of the war in Ukraine, answering two important questions: 1. how are social networks used to spread competing national narratives and disinformation in times of crisis? and 2. what is the role of social media owners and government policies in limiting disinformation?

: Phenolic aldehydes and their derivatives found in nature are well-known for their potential biological activity. In this study, four 1-substituted 1,2,3,4-tetrahydroisoquinolines (THIQs) derived from phenolic aldehydes were synthesized by phosphate buffer mediated Pictet-Spengler reaction. All derivatives were chemically and structurally characterized by elemental CHN analysis and spectroscopic methods (IR, HR-ESI-MS, 1 H-and 13 C-NMR). 1-Substituted THIQs derived from 3,4-dihydroxybenzaldehyde and 4-hydroxy-3-methoxybenzaldehyde were described for the first time. In order to cover the diversity of the mechanistic approach, but also to establish the relationship between structure and activity, antioxidant activity was examined by five different in vitro methods, namely: neutralization and reduction of stable free radicals 2,2-diphenyl-1-picrylhydrazyl and radical cation derived from [(2,2´-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)], ferric reducing antioxidant power, oxygen radical absorbance capacity, and ability to chelate Fe(II) ions. In vitro inhibition of acetylcholinesterase (AChE) was examined by the Ellman's colorimetric method, while computer-simulated docking was used to reveal the preferred binding site and major interaction between AChE and THIQs. Antibacterial testing was examined using the agar well method and results were presented in the form of zones of inhibition (mm).