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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 139
Chlebicka, Iwona , Drábek, Pavel , Kalamajska, Agnieszka
Caccioppoli-type estimates and Hardy-type inequalities derived from weighted p-harmonic problems

We obtain Caccioppoli-type estimates for nontrivial and nonnegative solutions to anticoercive partial differential inequalities of elliptic type involving weighted p-Laplacian. Using Caccioppoli-type estimates, we obtain several variants of Hardy-type inequalities in weighted Sobolev spaces.

Bizzarri, Michal , Lávička, Miroslav , Vršek, Jan
Linear computational approach to interpolations with polynomial Minkowski Pythagorean hodograph curves

Methods using Pythagorean hodographs both in Euclidean plane and Minkowski space are often used in geometric modelling when necessary to solve the problem of rationality of offsets of planar domains. A main justification for studying and formulating approximation and interpolation algorithms ...

Bobkov, Vladimír , Drábek, Pavel , Ilyasov, Yavdat
On partially free boundary solutions for elliptic problems with non-lipschitz nonlinearities

We show that the elliptic equation with non-Lipschitz right-hand side, considered on a smooth star-shaped domain Ω subject to zero Dirichlet boundary conditions, might possess a nonnegative ground state solution which violates Hopf’s maximum principle only on a nonempty subset Γ of the&...

Hynčík, Luděk , Bońkowski, Tomasz
Helmet to head coupling by multi-body system

Bobkov, Vladimír
Asymptotic relation for zeros of cross-product of Bessel functions and applications

Let $a_{\nu,k}$ be the $k$-th positive zero of the cross-product of Bessel functions $J_\nu(R z) Y_\nu(z) - J_\nu(z) Y_\nu(R z)$, where $\nu\geq 0$ and $R>1$. We derive an initial value problem for a first order differential equation whose solution $\alpha(x)...

Holečková, Irena , Kletečka, Jakub , Štěpánek, David , Žídek, Slavomír , Bludovský, David , Pouska, Jan , Mautner, Pavel , Přibáň, Vladimír
Cognitive impairment measured by event-related potentials during early and late postoperative period following intravenous or inhalation anaesthesia

This study investigated modification in cognitive function following inhalation (IA) and total intravenous (TIVA) anaesthesia measured using auditory ERPs (Event Related Potentials). Methods : Auditory ERPs examination with N1, P3a and P3b component registration was carried out one day before sur...

Santiago, J.A. , Fernández-Martínez, I. , Kozák, Tomáš , Čapek, Jiří , Wennberg, A. , Molina-Aldareguia, J.M. , Bellido-González, V. , González-Arrabal, R. , Monclús, M.A.
The influence of positive pulses on HiPIMS deposition of hard DLC coatings

Diamond-like Carbon (DLC) coatings were deposited by a novel HiPIMS method that incorporates positive voltage pulses at the end of the conventional HiPIMS discharge. Different positive voltage amplitudes were used to evaluate the effect of this operation mode on the discharge process an...

Jurčík, Adam , Bednář, David , Byška, Jan , Marques, Sérgio Manuel , Furmanová, Katarína , Daniel, Lukáš , Kokkonen, Piia Pauliina , Brezovský, Jan , Strnad, Ondřej , Štourač, Jan , Pavelka, Antonín , Maňák, Martin , Damborský, Jiří , Kozlíková, Barbora
CAVER Analyst 2.0: Analysis and Visualization of Channels and Tunnels in Protein Structures and Molecular Dynamics Trajectories

Motivation: Studying the transport paths of ligands, solvents, or ions in transmembrane proteins and proteins with buried binding sites is fundamental to the understanding of their biological function. A detailed analysis of the structural features influencing the transport paths is also imp...

Marek, Patrice , Vávra, František
Comparison of Home Team Advantage in English and Spanish Football Leagues

Home team advantage in sports is widely analysed phenomenon. This paper builds on results of recent research that -- instead of points gained -- uses goals scored and conceded to describe home team advantage. Using this approach, the home team advantage is random variable that...

Šedivá, Blanka , Marek, Patrice
Stability analysis of optimal mean-variance portfolio due to covariance estimation

The objective of this paper is to study the stability of the mean-variance portfolio optimization. The results of the mean-variance optimal selection problem are very sensitive to the model parameters (portfolio calibration window and frequency of portfolio rebalancing). There are presented ...

Bizzarri, Michal , Lávička, Miroslav , Kosinka, Jiří , Vršek, Jan
A direct and local method for computing polynomial Pythagorean-normal patches with global G1 continuity

We present a direct and local construction for polynomial G1 spline surfaces with a piece-wise Pythagorean normal (PN) vector field. A key advantage of our method is that the constructed splines possess exact piece-wise rational offsets without any need for reparametrisations, which in&...

Volek, Jonáš
Násobnost kritických bodů funkcionálů se sedlovou geometrií

We study the multiplicity of critical points for continuously differentiable functionals on real Banach spaces. We prove that a functional which satisfies the assumptions of the Saddle Point Theorem and moreover is bounded from below has at least three critical points. Apparently, there...

Rendlová, Zdeňka
The dynamic behavior of the fast rotating system in dependence on operating parameters of bearing supports

Typical components of many industrial devices are rotating parts. In case of automotive engines, turbochargers are used in order to increase the engine efficiency. These turbochargers are understood as relatively small rotating parts working in aggressive conditions. Although they are usually...

Polach, Pavel , Hajžman, Michal , Bulín, Radek
Selected problems solved in Pilsen using multibody dynamics

The paper informs on some problems solved during approximately past twenty years in Pilsen using multibody simulations. Naturally, the list of activities is not comprehensive, it concerns activities of the authors in Výzkumný a zkušební ústav Plzeň s.r.o. and in the Department of M...

Pecka, Aleš , Bublík, Ondřej , Vimmr, Jan
FlowPro: multipurpose CFD software written in Java

FlowPro is a multipurpose open-source CFD software, which is being developed by the researchers of the Department of Mechanics of the Faculty of Applied Sciences at the University ofWest Bohemia. FlowPro is designed to solve various non-linear systems of hyperbolic-parabolic partial differen...

Lukeš, Vladimír , Zemčík, Hana
Identification of material parameters using homogenization approach and SfePy software

The finite element solver SfePy and Python modules are used to identify the material parameters of the carbon fibers and the epoxy matrix which constitute a unidirectional long-fiber composite. The mathematical model of the heterogeneous structure is base on two-scale homogenization method&#...

Jansová, Magdalena , Kališ, Vladimír , Rušavý, Zdeněk , Raisanen, Sari , Lobovský, Libor , Laine, Katariina
Velikost hlavičky plodu a vliv manuální perineální protekce

The aim of this study was to evaluate whether a previously identified modification of Viennese method of perineal protection remains most effective for reduction of perineal tension in cases with substantially smaller or larger fetal heads.

Lužar, Borut , Mockovčiaková, Martina , Soták, Roman
Hvězdný chromatický index subkubických grafů

A star edge-coloring of a graph is a proper edge-coloring without bichromatic paths and cycles of length four. We consider the list version of this coloring and prove that the list star chromatic index of every subcubic graph is at most 7, answering the question of D...

Bizzarri, Michal , Lávička, Miroslav , Vršek, Jan
Piecewise rational approximation of square-root parameterizable curves using the Weierstrass form

In this paper we study situations when non-rational parameterizations of planar or space curves as results of certain geometric operations or constructions are obtained, in general. We focus especially on such cases in which one can identify a rational mapping which is a double...

Bizzarri, Michal , Lávička, Miroslav , Kosinka, Jiří
Skinning and blending with rational envelope surfaces

We continue the study of rational envelope (RE) surfaces. Although these surfaces are parametrized with the help of square roots, when considering an RE patch as the medial surface transform in 4D of a spatial domain it yields a rational parametrization of the domain’s boundar...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 139