VSB - Technical University of Ostrava

Oxygen Evolution Electrocatalysts with Trinuclear, Mixed‐Valence Iron Motifs on Electronically Aligned Carbon Dots

ABSTRACT The oxygen evolution reaction (OER), a bottleneck for water electrolysis, remains limited by the adsorbate scaling relations and sluggish interfacial electron transfer (IET). We address these challenges by anchoring mixed‐valence Fe 3+ /Fe 2+ motifs on aspartic‐acid–deri...

Mastodon: the command center for large-scale lineage-tracing microscopy datasets

Understanding development in living organisms requires following the divisions, movements, and fates of cells. While advances in microscopy have enabled whole-embryo imaging at the cellular level, extracting and analyzing cell lineages from these massive datasets remains a signif...

Physical viability of the massive pulsar PSR J0952–0607 within a polytropic framework

We develop a relativistic model for one of the most massive pulsars, PSR J0952-0607, by constructing exact solutions of Einstein’s field equations (EFEs) within the framework of the generalized Tolman–Kuchowicz (GTK) spacetime. The stellar interior is modeled as anisotropic matte...

Application of soliton theory to plasma confinement and fluid transport: analytical and numerical results for the Akbota equation

Abstract In this paper, an analytical and numerical analysis of the integrable Akbota equation, which is a nonlinear wave equation applicable in the areas of plasma physics and fluid dynamics, is performed. With the help of traveling wave transformation, the governing set of equa...

MEE-Net: a lightweight CNN with interpretability assessment for cardiomegaly detection from chest X-rays on edge devices

Abstract Cardiomegaly is a clinically important indicator of cardiovascular risk, yet its detection from chest radiographs remains challenging due to inter-observer variability and the limited deployability of current deep learning models in resource-constrained settings. To addr...

Content-aware malicious website detection using multilingual BERT

Abstract Malicious website detection traditionally relies on URL analysis, but this is limited as attackers can create clean-looking links, abuse URL shorteners, or even hijack trusted websites. To address this gap, we shift the focus from analyzing technical artifacts to underst...

One-Pot Synthesis of Triazine-Embedded Hierarchically Porous Organosilica Polymers via Tandem Condensation for Carbon Capture and Conversion

Abstract A simple one-step route for designing three covalently bonded porous organosilica polymers via tandem condensation, bearing an adjustable triazine moiety and N–Si cooperative microenvironments, has been reported for the first time. In contrast to the traditional methods...

A unified fixed point approach for enriched bivariate mappings with applications to volterra systems and fractional-order chaos

We develop a unified fixed point theory for enriched bivariate contractions in ordered Banach spaces and in ordered convex metric spaces. Two classes of mappings are introduced and analysed: enriched bivariate Ciric-Reich-Rus contractions ( 𝒞 B C R R C e ) and enriched bivariate...

Mathematical modeling of chikungunya transmission dynamics and control using disease-driven machine learning

Abstract The Chikungunya virus (CHIKV) is a significant vector-borne threat; however, few models successfully integrate rigorous theoretical guarantees with efficient, reliable predictive tools. This study aims to address this gap by introducing a nonlinear seven-compartment huma...

Metal-coordinated water-assisted enhanced proton conductivity of robust Ni(II)-based 3D/2D metal-organic frameworks

MOFs are considered as frontline support materials for obtaining high proton conduction under humid conditions. This study deals with a 3D and a 2D single-crystal Ni-MOFs. The open-network 3D Ni-MOF (Ni-NDC-BPYH), constructed from 2,6-napthalenedicarboxylic acid (2,6-NDC) and 1,2...

Advanced design of highly efficient graphene-based Ti-GaSb-Si based solar absorber for mining related applications optimized using machine learning

The solar absorber is a necessity in renewable energy applications; it has been widely used and investigated in various materials and layer configurations. Analysis of the design and materials, with height as a parameter, can be developed for effective solar absorber design as a...

The numerical solution of 2D elastoplastic contact problems by dual mortar method, dualization, and optimal quadratic programming solvers

This paper contributes a novel and complete pipeline for solving 2D elastoplastic contact problems by integrating dual mortar methods for contact handling, the von Mises criterion with bilinear isotropic hardening for modeling plasticity, and optimal quadratic programming algorit...

Influence of FFF Substrate Material and 3D-Printed Surface Morphology on the Formation of Electrodeposited Copper Layers

Electrodeposition of metallic coatings represents a promising approach for extending the functional properties of additively manufactured polymer components. However, the resulting coating morphology may be influenced not only by the deposition conditions but also by the material...

Stochastic delay derivatives of Newcastle disease application in epidemic model: Stability analysis and approximation

The illicit trade in wildlife for pet purposes poses a direct risk to animal populations through overharvesting, but it also serves as an indirect conduit for the spread of contagious diseases. The present study assessed the effects of the hypothetical release of captured, infect...

Heat accumulation in solid materials during the combustion of solid fuels

Abstract This study focuses on the experimental evaluation of the effect of heat accumulation on the course of heat output of wood-burning stoves using wood logs. The motivation comes from the unstable nature of batch combustion, which leads to significant fluctuations in heat su...

Advanced biorefinery integration in kraft pulp mills: BECCS pathways, commercial failure analysis, and the carbon price threshold for subsidy-free viability

Kraft pulp mills are increasingly viewed as strategic platforms for decarbonization because they combine biogenic carbon flows, chemical recovery infrastructure, and opportunities for heat and material integration within a circular bioeconomy. However, prior reviews have focused...

Utilization of Recycled Brick Aggregate in Cementitious Composites: Mechanical Performance, Cement Matrix Solidification Effect and Life Cycle Assessment

The growing production of construction and demolition waste has been stimulating the need to look for sustainable alternatives to natural aggregate used in the production of cement composites. This study evaluates the potential use of recycled brick material as a substitute for n...

Sustainable Polymer Additive Manufacturing Across Scales: A Critical Review of Pallet-Scale Structural Opportunities and Membrane Feed Spacers

Additive manufacturing (AM) can support more sustainable polymer production, but the benefit is conditional on process energy, material chemistry, build yield, post-processing, service life, repair, and end-of-life recovery. This critical integrative review compares three polymer...

Impact of stochasticity and time delay on stuxnet virus propagation in critical control systems

A complex computer worm that was first discovered in 2010, Stuxnet targeted industrial control systems and led to physical sabotage of production processes all without being detected. Symantec estimates that over 100,000 computers were infected by the malware, with around 60% of...

Comparative Study of Hydrometallurgical and Pyrometallurgical ZnO Recovery from Mixed Metallurgical Sludge

The recovery of zinc from mixed steelmaking and blast furnace sludge was investigated through a direct comparison of the hydrometallurgical acetic acid leaching process and pyrometallurgical processing using coke dust as a reductive agent, with particular emphasis on the structur...