High-Precision Contactless Stereo Acoustic Monitoring in Polysomnographic Studies of Children.

This paper focuses on designing a robust stereophonic measurement set-up for sound sleep recording. The system is employed throughout the night during polysomnographic examinations of children in a pediatric sleep laboratory at a university hospital. Deep learning methods were used to classify the sounds in the recordings into four categories (snoring, breathing, silence, and other sounds).

Enhancing Fatigue Lifetime of Secondary AlZn10Si8Mg Alloys Through Shot Peening: Influence of Iron Content and Surface Defects.

The rising demand for aluminium and environmental concerns highlight the need for a circular economy using recycled alloys. This study examines the effect of shot peening on the high-cycle fatigue life of secondary AlZn10Si8Mg alloys with different iron contents: Alloy A (0.14 wt.

Influence of Strain Rate on the Strain-Induced Martensite Transformation in Austenitic Steel AISI 321 and Barkhausen Noise Emission.

This study investigates the evolution of strain-induced martensite (SIM) and its effect on magnetic Barkhausen noise (MBN) in AISI 321 austenitic stainless steel subjected to uniaxial tensile testing. Using X-ray diffraction and the Barkhausen noise technique, the formation and distribution of SIM were analysed as functions of plastic strain and strain rate. The results show that MBN is primarily governed by plastic deformation and strain rate rather than residual stress.

Crack-Mitigating Strategy in Directed Energy Deposition of Refractory Complex Concentrated CrNbTiZr Alloy.

The conventional manufacturing of refractory complex concentrated alloys (RCCAs) for high-temperature applications is complicated, particularly when material costs and high melting points of the materials processed are considered. Additive manufacturing (AM) could provide an effective alternative. However, the extreme temperatures involved represent significant challenges for manufacturing defect-free alloys using this approach.

Long-Term and Seasonal Trends in the Mode of Accumulation of Elements in the Bodies of Aquatic Insect Larvae.

Aquatic insect larvae in high mountain streams reflect natural changes in water chemistry, making them effective bioindicators of ecosystem health. Changes in element accumulation in the bodies of larvae from the functional feeding groups scrapers and predators were monitored over a 5-year period (2019-2023). We aimed to evaluate long-term and seasonal trends in the accumulation of selected elements and to assess whether these patterns were linked to hydrological conditions or reflected post-disturbance recovery.

AI-Driven fetal distress monitoring SDN-IoMT networks.

The healthcare industry is transforming with the integration of the Internet of Medical Things (IoMT) with AI-powered networks for improved clinical connectivity and advanced monitoring capabilities. However, IoMT devices struggle with traditional network infrastructure due to complexity and eterogeneous. Software-defined networking (SDN) is a powerful solution for efficiently managing and controlling IoMT.

A low-cost portable system for 3-Axis measurement of static and extremely low frequency magnetic fields.

Magnetic fields play a crucial role in modern science and technology - yet precise and accessible tools for their measurement remain limited, especially for small laboratories, educators, or independent researchers. This paper introduces a novel, open-source magnetic field measurement system based on three-axis sensors for monitoring both direct and extremely low frequency magnetic fields. The device features a modular hardware design centered around a custom PCB, enabling flexible analog filtering, Bluetooth data transmission, and offline LCD visualization.

Method for Extracting Arterial Pulse Waveforms from Interferometric Signals.

This paper presents a methodology for extracting and simulating arterial pulse waveform signals from Fabry-Perot interferometric measurements, emphasizing a practical approach for noninvasive cardiovascular assessment. A key novelty of this work is the presentation of a complete Python-based processing pipeline, which is made publicly available as open-source code on GitHub (git version 2.39.

Cyber resilience conceptual model for European Union NIS2 standards implementation in Slovakia.

The use of modern information and communication technologies in the business environment, as well as in everyday life has become common. However, with the dynamic development of these technologies, the risk of their abuse is also increasing. In this context, cyber resilience is coming into focus.

Research of the possibility of using beams with corrugated walls in a passenger rail car frame.

The material of the article provides a scientific evaluation of the feasibility of using beams with corrugated walls in the passenger rail car frame structure. Such a decision will allow to reduce the material amount of the passenger rail car sprung mass while maintaining the conditions of strength and operational reliability. Existing versions of beams with corrugated walls are analysed.

Effect of fuel feeding cycle adjustments on emissions in spruce pellet combustion with the application of a four-tube electrostatic precipitator.

Air quality protection and emission reduction are essential for ensuring a high quality of life and public health. This study evaluates the influence of fuel dosage on the performance of an automatic pellet boiler, focusing on heat output, gaseous emissions (carbon monoxide, nitrogen and sulfur oxides), particulate matter and the efficiency of an electrostatic precipitator. Fuel dosage was adjusted through supply/standstill ratios in seconds (11/15, 14/20, 18/25, 22/30, 25/35), and a four-tube precipitator was designed, increasing the collection surface area by 1.

Traces elements in feces of Eurasian otters from the mountain stream Javorinka (Slovakia).

The aim of this study was to evaluate the concentrations of elements and heavy metals (Hg, P, S, Cl, K, Ca, Ti, Cr, Mn, Fe, Cu, Zn, Se, Rb, Sr, Zr, Mo, Sb, Ba, and Pb) in fecal samples of the river otter (Lutra lutra) which inhabits the Javorinka mountain stream in the High Tatras, part of the Western Carpathians in Slovakia. Javorinka serves as a model stream with minimal human impact. As a predator, the otter is a suitable bioindicator of the environment it inhabits.

Properties of Selected Additive Materials Used to Increase the Lifetime of Tools for Crushing Unwanted Growths Using Hardfacing by Welding Technology.

This article focuses on the possibilities of increasing the service life of tools for crushing unwanted growths. One way to increase their service life is to increase the hardness and resistance to abrasive wear of exposed surfaces of the tool, which are their face and back. At the same time, however, care must be taken to ensure that the shape and weight of the tool is not altered after the additive has been hardfaced on.

Experimental Verification of the Model for Estimating the Corrosion Current of Reinforcement in an RC Element.

This article includes tests of the deflection and load-bearing capacity of reinforced concrete beams exposed to chloride ions. This work forms part of the verification of a newly developed model for estimating the intensity of the corrosion current of the reinforcement, which assumes the possibility of estimating the corrosion parameter based on a detailed analysis of the element deformation. The model assumes the use of the inverse problem, which is based on the analysis of deflection as a result of the partial impact of the corrosion process on the main reinforcement in the reinforced concrete element.

Using the Spark Plug as a Sensor for Analyzing the State of the Combustion System.

This article presents a method that uses a spark plug as a sensor to monitor an internal combustion engine. In addition, the voltage sensors measured the high voltage at the spark plugs using a non-contact method. Monitoring can now be performed in a simple way in real time, along with data processing.

Thermodielectric Properties of Polyurethane Composites with Aluminium Nitride and Wurtzite Boron Nitride Microfillers: Analysis Below and near Percolation Threshold.

This study explores microcomposites' thermodielectric properties-thermal conductivity (keff) and dielectric permittivity (εr)-across filler concentrations from 1 wt% (φ≈0.0035) to 60 wt% (φ≈0.45) spanning the pre- (φ<0.

Photoplethysmography imaging to assess facial perfusion under simulated hypovolemia.

This study evaluates the potential of photoplethysmography imaging (PPGI) with automated facial tracking for detecting hemodynamic and autonomic changes induced by lower-body negative pressure (LBNP). The goal is to assess whether PPGI-derived facial perfusion variations are related with stroke volume (SV), systemic vascular resistance (SVR), heart rate variability (HRV), and autonomic responses to progressive hypovolemia.Twenty-four healthy adults (8 females, 16 males; aged 28.

Semantic knowledge graph fusion for fake news detection: Unifying content-based features and evidence-based analysis in the COVID-19 infodemic.

In the era of digital communication, the rapid spread of information has brought both benefits and challenges. While it has democratized access to knowledge, it has also led to an increase in fake news, with significant societal repercussions. The COVID-19 pandemic has exacerbated this issue, resulting in what the World Health Organization has termed an "infodemic.

The proliferation rates of HT-1080 human fibrosarcoma cells can be accelerated or inhibited by weak static and extremely low frequency magnetic fields.

Introduction: Weak static and low-frequency magnetic fields (MFs) have been hypothesized to influence biological systems through mechanisms involving nuclear spin coupling. This study investigates how such fields modulate the proliferation of HT-1080 fibrosarcoma cells.

Methods: HT-1080 cells were exposed in vitro for 4 days to weak MFs with a 10 μT amplitude and frequencies between 12 Hz and 33 Hz, superimposed on a 45 μT static background field.

Thermal Degradation of Face Mask Waste through Pyrolysis at Different Temperatures for Value-Added Products.

The widespread use of protective face masks to prevent the transmission of viral diseases has led to a significant increase in plastic waste. This study investigates the conversion of disposable face masks into valuable solid, oil, and gas products through pyrolysis. Two types of disposable masks were used as input materials: FFP2 face masks and ordinary face masks.

Modelling the Ki67 Index in Synthetic HE-Stained Images Using Conditional StyleGAN Model.

Hematoxylin and Eosin (HE) staining is the gold standard in histopathological examination of cancer tissue, representing the first step towards cancer diagnosis. The second step is a series of immunohistochemical stainings, including cell proliferation markers called the Ki67 index. Deep learning models offer promising solutions for improving medical diagnostics, while generative models provide additional explainability of predictive models that is essential for their adoption in clinical practice.

An Innovative Approach to Occupational Risk Assessment in OHS: A Case Study on the Verification of the ALrisk Model in Manufacturing Enterprises in Slovakia.

The issue of occupational health and safety (OHS) is currently a pressing and essential challenge for improving production processes and workplace environments, particularly in manufacturing enterprises. With increasing demands for efficiency and workplace safety, it is crucial to implement innovative approaches that enhance accident prevention and safeguard employees' health. These approaches contribute to the long-term sustainability of enterprises and reduce costs associated with workplace injuries and occupational diseases.

Experimental and Numerical Analysis of Rotary Friction Welding for Al-Cu Joints: Effects of Friction Time on Plastic Deformation and Joint Integrity.

The principles of the friction welding (FW) process of the two different non-ferrous metals, aluminum and copper, are presented in this paper. Considering that the bimetallic Al-Cu joints find applications in electrical engineering, as well as in other industrial fields, the basic characteristics and compatibility of these metals are discussed, along with the influence of various parameters on the properties of their friction welded joints. The experimental study involved rotation friction welding (RFW), which was used to weld aluminum and copper samples.

Long-term changes in chemical components in the meadow pipit (Anthus pratensis) in the formerly heavily polluted Eastern Sudetes Mountains.

The Eastern Sudetes Mountains (Northern Moravia, Czech Republic) were among the most polluted regions of Europe due to toxic metal depositions and acid rain, until the desulfurization of emissions from coal power stations and reduction of heavy industry which took place in the 1990s. This study provides a comparison of data on the levels of calcium, lead, cadmium, and aluminum in soil, meadow pipit (Anthus pratensis) nestlings, and their available diet in 1994-1999 and in 2017-2019. The soil pH and exchangeable amount of calcium and lead increased slightly.

Using of human capital management in small andrr medium-sized enterprises in context of Industry 4.0.

Human capital management (HCM) helps manage and develop human capital (HC) in businesses through investments that increase the value of HC and contribute to improving the financial situation of companies. Industry 4.0 (4IR) presents new challenges especially for small and medium-sized enterprises (SMEs).