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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 24
Moskovchenko, Alexey , Švantner, Michal , Vavilov, Vladimir P. , Chulkov, Arsenii O.
Characterizing Depth of Defects with Low Size/Depth Aspect Ratio and Low Thermal Reflection by Using Pulsed IR Thermography

This study is focused on the quantitative estimation of defect depth by applying pulsed thermal nondestructive testing. The majority of known defect characterization techniques are based on 1D heat conduction solutions, thus being inappropriate for evaluating defects with low aspect ratios. ...

Martan, Jiří , Prokešová, Lucie , Moskal, Denys , de Faria, B. C. Ferreira , Honner, Milan , Lang, Vladislav
Heat accumulation temperature measurement in ultrashort pulse laser micromachining

Ultrashort pulse laser micromachining is affected by the heat accumulation resulting from the residual heat from previous laser pulses on the sample surface. Up to now, most of the works analysed the accumulation by numerical modelling. The present work focussed on development and ...

Vangaever, Stijn , Van Thielen, Joost , Hood, Jeremy , Olver, John , Honnerová, Petra , Heynderickx, Geraldine J. , Van Geem, Kevin M.
The effect of refractory wall emissivity on the energy efficiency of a gas-fired steam cracking pilot unit

The effect of high emissivity coatings on the radiative heat transfer in steam cracking furnaces is far from understood. To start, there is a lack of experimental data describing the emissive properties of the materials encountered in steam cracking furnaces. Therefore, spectral normal&...

Kališ, Vladimír , Rušavý, Zdeněk , Havelková, Linda , Zítka, Tomáš , Tolar, David , Ismail, Khaled M.
Metrics of perineal support (MOPS) study

Background: Manual perineal protection (MPP) is an intrapartum intervention suggested to protect perineal integrity during childbirth. Proper execution of MPP is complex and evaluation of its true contribution is difficult in the clinical setting because of the large number of obstetric vari...

Muzika, Lukáš , Švantner, Michal , Houdková Šimůnková, Šárka , Šulcová, Petra
Application of flash-pulse thermography methods for quantitative thickness inspection of coatings made by different thermal spraying technologies

Flash-pulse thermography is a nondestructive testing method, which is based on thermal excitation and response analysis of a tested sample. It is the traditional method for a non-destructive inspection of discontinuities and inhomogeneities at a sample surface, which is also applicable for&#...

Moskovchenko, Alexey , Vavilov, V. P. , Švantner, Michal , Muzika, Lukáš , Houdková Šimůnková, Šárka
Active IR Thermography Evaluation of Coating Thickness by Determining Apparent Thermal Effusivity

Pulsed thermography is a common technique for nondestructive testing (NDT) of materials. This study presents the apparent effusivity method for the quantitative evaluation of coating thickness in a one-sided thermal NDT procedure. The proposed algorithm is based on determining a threshold va...

Moskovchenko, Alexey , Vavilov, V. P. , Bernegger, Raphael , Maierhofer, Christiane , Chulkov, Arsenii O.
Detecting Delaminations in Semitransparent Glass Fiber Composite by Using Pulsed Infrared Thermography

Thanks to its good strength/mass ratio, a glass fibre reinforced plastic (GFRP) composite is a common material widely used in aviation, power production, automotive and other industries. In its turn, active infrared (IR) nondestructive testing (NDT) is a common inspection technique for&...

Pérez, Rosalina , Querejeta, Amaia L. , Corres, María Ángeles , Muñoz, Josemari Maria , Grande, Hans Jürgen , Honnerová, Petra
Thermal behaviour of vitreous ceramic coatings obtained by electrophoretic deposition

In this study, three different vitreous ceramic coatings have been designed to improve radiation heat transfer and thereby increase the thermal efficiency of fired heaters or furnaces working at high temperatures. The vitreous ceramic coatings were produced through Electrophoretic Deposition tech...

Schmailzl, Anton , Käsbauer, Johannes , Martan, Jiří , Honnerová, Petra , Schäfer, Felix , Fichtl, Maximilan , Lehrer, Tobias , Tesař, Jiří , Honner, Milan , Hierl, Stefan
Measurement of core temperature through semi-transparent polyamide 6 using scanner-integrated pyrometer in laser welding

Predicting the core temperature during welding is an ambitious aim in many research works. In this work, a 3D-scanner with integrated pyrometer is characterized and used to measure the temperature during quasi-simultaneous laser transmission welding of polyamide 6. However, due to welding&#x...

Martan, Jiří , Moskal, Denys , Smeták, Ladislav , Honner, Milan
Performance and Accuracy of the Shifted Laser Surface Texturing Method

Shifted laser surface texturing method (sLST) was developed for increasing of production speed of functional surface textures to enable their industrial applicability. In this work, the shifted method is compared with classic methods on real texturing example with focus on achieving highest&...

Muzika, Lukáš , Švantner, Michal , Moskal, Denys
Experimental investigation of time-power transformation method for flash-pulse thermographic testing

The paper deals with flash-pulse thermography, which is one of the most used thermographic inspection methods. The method is based on flash excitation of an inspected object and an analysis of its thermal response recorded by an infrared camera. This paper deals with a time-po...

Švantner, Michal , Muzika, Lukáš , Houdková Šimůnková, Šárka
Quantitative inspection of coating thickness by flash-pulse thermography and time-power transformation evaluation

sample. Its application to coatings can indicate a presence of local thickness variations; however, it mostly does not bring any quantitative information about the thickness of the coatings. This contribution is focused on a quantification of the thermographic inspection, which would make&#x...

Švantner, Michal , Študent, Josef , Veselý, Zdeněk
Continuous walking-beam furnace 3D zonal model and direct thermal-box barrier based temperature measurement

Numerical simulation of industrial reheating furnaces belongs to important procedures for an optimization of their designand processing parameters. A 3D numerical model of a continuous gas burners heated walking-beam furnace is introduced in this paper. The main benefit of the model is ...

Matějíček, Jiří , Vilémová, Monika , Moskal, Denys , Mušálek, Radek , Krofta, Jan , Janata, Marek , Kutílek, Zdeněk , Klečka, Jakub , Heuer, Simon , Martan, Jiří , Nardozza, Emanuele , Houdková Šimůnková, Šárka , Dorow-Gerspach, Daniel
The Role of Laser Texturing in Improving the Adhesion of PlasmaSprayed Tungsten Coatings

Švantner, Michal , Muzika, Lukáš , Houdková Šimůnková, Šárka
Quantitative inspection of coatings thickness by time-power transformation flash pulse thermographic method

Thermographic testing is an inspection method, which primary indicates a presence of discontinuities in a tested sample. Its application to coatings can indicate a presence of local thickness variations; however, it mostly does not bring a quantitative information about a thickness of t...

Lyphout, Christophe , Bolelli, Giovanni , Karhanová, Eva , Sato, Kazuto , Yamada, Junya , Houdková Šimůnková, Šárka , Lusvarghi, Luca , Manfredini, Tiziano
Influence of hardmetal feedstock powder on the sliding wear and impact resistance of High Velocity Air-Fuel (HVAF) sprayed coatings

The present work aimed to clarify how the characteristics of WC-CoCr hardmetal feedstock powders, namely thegrain size of the WC carbides and of the binder and the compressive strength of the sintered aggregates, affect the dry sliding wear and impact resistance of coatings deposit...

Moskal, Denys , Martan, Jiří , Kučera, Martin
Shifted Laser Surface Texturing (sLST) in Burst Regime

High laser-scanning speed and high precision are two opposite parameters for effective laser surface texturing (LST). Application of a sequence of laser pulses (called burst) helps to increase the processing effectivennes and speed, but precision control of laser pulses arriving becomes a&#x...

Martan, Jiří , Moskal, Denys , Kučera, Martin
Laser surface texturing with shifted method—Functional surfaces at high speed

Laser surface texturing is a promising technology for future wide application of functional surfaces with specific properties like hydrophobic, antibacterial, adhesive, selfcleaning, anticorrosion, light absorbing, low friction, etc. Great advancements have been made in this field in last years, but&#...

Cizek, Jan , Brožek, Vlastimil , Chráska, Tomáš , Lukáč, František , Medricky, Jan , Mušálek, Radek , Tesar, Tomas , Šiška, Filip , Antos, Z. , Čupera, Jan , Matějková, Michaela , Spotz, Zdeněk , Houdková Šimůnková, Šárka , Kverka, Miloslav
Silver-Doped Hydroxyapatite Coatings Deposited by Suspension Plasma Spraying

Pure hydroxyapatite suspension was produced by wet chemical synthesis. Using a hybrid water-stabilized torch, a series of HA coatings were produced on SS304 and Ti6Al4V substrates and their properties were characterized by SEM, EDX and XRD techniques. After deposition, the amorphous phase&#x...

Mertl, Jiří , Žáčková, Eva , Řepová, Barbora
Quality of life of patients after total laryngectomy: the struggle against stigmatization and social exclusion using speech synthesis

In this article, we deal with the problem of potential stigmatization and social exclusion of people that have voice/speech problems due to neck cancer, especially those who have lost their voice because of total laryngectomy, and we analyze how this potential stigmatization could&...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 24