We characterised the microstructure of sandstone from the Msene locality (Czech Republic) by combining X-ray computed micro-tomography, back-scattered electron imaging, chemical composition analysis and textural analysis and gas permeation. Both, 2D and 3D images were commonly processed by linking an&...

The paper presents two-scale numerical algorithms for stress–strain analysis of porous media featured by self-contact at pore level. The porosity is constituted as a periodic lattice generated by a representative cell consisting of elastic skeleton and a void pore. Unilateral frictionless co...

We are concerned with the existence and qualitative properties of traveling wave solutions for a quasilinear reaction-diffusion equation on the real line. We consider a non-Lipschitz reaction term of Fisher-KPP type and a discontinuous diffusion coefficient that allows for degenerations and ...

In this paper, a fluid–structure interaction (FSI) solver with neural-network-based fluid-flow prediction is proposed. This concept is applied to the problem of vortex-induced vibration of a cylinder. The majority of studies that are concerned with fluid-flow prediction using neural networks solv...

This paper deals with flow field prediction in a blade cascade using the convolution neural network. The convolutional neural network (CNN) predicts density, pressure and velocity fields based on the given geometry. The blade cascade is modeled as a single interblade channel with p...

Temperature-driven genesis of morphology and structure of vanadium nanoparticle films fabricated by magnetron-based gas aggregation sources has been investigated. Three temperature regions were identified. In the first one which covers the range from room temperature to approximately 200 °C, the ...

Design: A cross-sectional study conducted between September 2016 and September 2019. Settings and participants: A total of 241 undergraduate midwifery students in a convenience sample participated in this study at a Faculty of Health Care Studies (in the Czech Republic). Methods: Data w...

Recent applications in Earth sciences require geoid models to be determined with a sub-centimetre internal error. Regional models of the geoid are usually determined using discrete gravity values measured at and/or outside the Earth, and global models of the Earth gravity field and...

In this paper, we propose an innovative Federated Learning-inspired evolutionary frame- work. Its main novelty is that this is the first time that an Evolutionary Algorithm is employed on its own to directly perform Federated Learning activity. A further novelty resides in the fact...

Rotating machinery supported on journal bearings is affected by forces due to rotating unbalance and pressure gradients in the oil film. The interaction of these forces can evoke nonlinear behaviour, including asynchronous motion and even chaos. This work attempts to characterise the su...

In this work we study existence, asymptotic behaviour and stability properties of O(m) ×O(n)-invariant solutions of the Allen-Cahn equation Δu +u(1 −u2) =0 in Rm×Rn with m, n ≥2 and m +n ≥8. We exhibit four families of solutions whose nodal sets are smooth logarithmic cor...

We construct new families of two-ended O(m) × O(n)-invariant solutions to the Allen–Cahn equation Δu + u − u3=0 in RN+1, with N ≥ 7, whose zero level sets diverge logarithmically from the Lawson cone at infinity. The construction is based on a careful study of the&#x...

Rotating unbalance is one of the key reasons for high vibration levels in turbochargers. The current studies consider the rotating unbalance as a series of static (force) unbalances and acknowledge the importance of their allocation and orientation. However, the displaced mass or materi...

We present a three-dimensional particle-based computer simulation of high-power impulse magnetron sputtering (HiPIMS) discharges which enables us to simulate the transport of atoms and ions in the discharge and the corresponding plasma parameters. A numerical algorithm is used to constrain the&#x...

The paper deals with the role of Al in thin film metallic glasses based on Cu and Zr. We employ a combination of molecular dynamics simulations of the atom-by-atom growth process with magnetron sputtering. We use the previously studied composition Cu0.46Zr0.54 as a starting po...

In the first one in this series of two papers, we have proved that every 3‐connected {K(1,3), N(1,3,3)}‐free graph is Hamilton‐connected. In this paper, we continue in this direction by proving that every 3‐connected {K(1,3), X}‐free graph, where X ∈ {N(1,1,5), N(2,2,3)}, is Hamilt...

The paper focuses on local phenomena modelling in the ball-and-socket pivot of tilting pad journal bearings. It provides an in-depth analysis of the influence of nonlinear normal force and friction forces generated in the pivot on the dynamic behaviour of the bearing. Contemporary ...

We study the effect of nitrogen content on functional properties, thermal stability, and oxidation resistance of hard and optically transparent amorphous Hf‒Y‒Si‒B‒C‒N coatings prepared by pulsed magnetron sputtering. Ab-initio simulations are performed to link the experimentally obtained properties with&#...

Introduction: Artificial neural networks are becoming an essential technology in data analysis, and their influence is starting to permeate the field of medicine. Experimental surgery has been a long-term subject of study of our lab; this is naturally reflected in our interest in o...

A new method for 5-axis flank milling of free-form surfaces is proposed. Existing flank milling path-planning methods typically use on-market milling tools whose shape is cylindrical or conical, and is therefore not well-suited for meeting fine tolerances for manufacturing of benchmark free-...