Václav Papež

Prof. Václav Papež

Electronic Devices
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Academic Career Length

16Years (2011-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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22 April 2021 in Materials
Verified
Journal Article
Open access
PDF file
KKKarel Künzel
Karel Künzel
VPVáclav Papež
Václav Papež
KCKristýna Carrera
Kristýna Carrera
PKPetr Konrád
Petr Konrád
MMMichal Mára
Michal Mára
Radoslav SovjákRadoslav Sovják
Radoslav Sovják
This paper deals with the description, measurement, and use of electromagnetic properties of ferromagnetic fibres used as dispersed fibre reinforcement in composite mixtures. Firstly, the fibres’ magnetic properties are shown, and a method of measuring the hysteresis loop of fibres is proposed. The results from the measurements are presented and a discussion of the influence of measured parameters on the fibres’ orientation in a magnetic field is performed. Furthermore, methods of non-destructive estimation, of their amount and orientation in the composite specimens, are discussed. The main experimental goal of this paper is to show the relationship between this non-destructive method’s results and the destructive flexural strength measurements. The method is sensitive enough to provide information related to fibre reinforcement.
24 December 2021 in Materials
Verified
Journal Article
Open access
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Kateřina NovákováKateřina Nováková
Kateřina Nováková
KCKristýna Carrera
Kristýna Carrera
PKPetr Konrád
Petr Konrád
KKKarel Künzel
Karel Künzel
VPVáclav Papež
Václav Papež
Radoslav SovjákRadoslav Sovják
Radoslav Sovják
The efficiency of fibre reinforcement in concrete can be drastically increased by orienting the fibres using a magnetic field. This orientation occurs immediately after pouring fresh concrete when the fibres can still move. The technique is most relevant for manufacturing prefabricated elements such as beams or columns. However, the parameters of such a field are not immediately apparent, as they depend on the specific fibre reaction to the magnetic field. In this study, a numerical model was created in ANSYS Maxwell to examine the mechanical torque acting on fibres placed in a magnetic field with varying parameters. The model consists of a single fibre placed between two Helmholtz coils. The simulations were verified with an experimental setup as well as theoretical relationships. Ten different fibre types, both straight and hook-ended, were examined. The developed model can be successfully used to study the behaviour of fibres in a magnetic field. The fibre size plays the most important role together with the magnetic saturation of the fibre material. Multiple fibres show significant interactions.
1 October 2011
Verified
Conference Paper
Closed access
VPVáclav Papež
Václav Papež
SPStanislava Papezova
Stanislava Papezova
This paper describes a wire resistor with the resistance of several hundreds ohms, with a power dissipation up to several hundreds watts. In a high frequency band, it shows maximum frequency reflection coefficient values with respect to the nominal resistance value of about 0.1, and which reaches a third order IM distortion products close to -130dBc at the dissipation power.
28 May 2026 in Measurement Science and Technology
Verified
Journal Article
Open access
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VPVáclav Papež
Václav Papež
KKKarel Künzel
Karel Künzel
PKPetr Konrád
Petr Konrád
KCKristýna Carrera
Kristýna Carrera
Petr KonvalinkaPetr Konvalinka
Petr Konvalinka
The mechanical performance of fiber-reinforced concrete is critically dependent on the orientation and concentration of its reinforcing fibers. This paper presents a non-destructive method for diagnosing ferromagnetic (steel) fiber parameters especially suited for large planar specimens. The proposed technique utilizes an electromagnetic measurement system using electrical coils with commercial LCR meters, but also a novel custom-made meter suitable for factory environments, offering a practical solution for quality control in the prefabrication of high-performance structural elements. This study details the theoretical background, experimental setup, methodology and provides an evaluation of the diagnostic system’s effectiveness and accuracy. The experiments were performed using steel fiber specimens with cardboard as a carrier. This allows for the exact placement and orientation of the fibers in a matrix that has negligible influence on the magnetic field, similar to plain concrete. The results demonstrate a strong correlation between the electromagnetic measurements and the actual fiber parameters, confirming the method’s reliability.
17 May 2022 in International Journal of Computational Methods and Experimental Measurements
Verified
Journal Article
Open access
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KTKristýna Takáčová
Kristýna Takáčová
KKKarel Künzel
Karel Künzel
VPVáclav Papež
Václav Papež
PKPetr Konrád
Petr Konrád
MMMichal Mára
Michal Mára
Radoslav SovjákRadoslav Sovják
Radoslav Sovják
This paper explores the practical possibility of using a magnetic field to orient steel fibres in a fresh concrete matrix. This process leads to...
1 June 2017
Verified
Conference Paper
Closed access
JZJan Zak
Jan Zak
VPVáclav Papež
Václav Papež