Libor Sitek

Shaping of rock specimens for testing of uniaxial tensile strength by high speed abrasive water jet: First experience

Libor Sitek, Josef Foldyna

Standard shapes of specimens are used for testing of uniaxial tensile strength of metals. However, direct determination of uniaxial tensile strength of rocks and rock-like materials was often unfeasible because required shapes of specimens are impossible to create by conventional shaping methods. …

cz (code pays fourni par la source)

Rock cutting by pulsing water jets

Josef Foldyna, Libor Sitek, Petr Martinec, Jiří Ščučka et autres

Generation of pulsations in high-speed water jets enables to increase the cutting performance of water jets due to the fact that the impact pressure generated by an impact of slug of water on the target material is considerably higher than the stagnation …

cz, pl (code pays fourni par la source)

Comparison of material erosion under air and submerged conditions using a high-energy self-excited modulated water jet

Zdeněk Říha, Michal Zeleňák, F. Miranda, Akash Nag et autres

cz (code pays fourni par la source)

Comparison of model initialization methods in machine learning for thin-section rock image classification

Magdalena Habrat, Libor Sitek, M. Młynarczuk

Microscopic rock image analysis aids geotechnical and geological studies, often with computational methods. The growing availability of image data has led to the widespread adoption of automation in image analysis. However, the lack of large, publicly available datasets has hindered the development …

pl, cz (code pays fourni par la source)

Study of Erosion Wear of PVD-Coated Focusing Tubes in AWJ Cutting Process

Petr Hlaváček, Libor Sitek, Michal Zeleňák

cz (code pays fourni par la source)

Use of Accelerated-Hydro-Abrasive-Cavitation-Erosion (AHACE) Method to Investigate the Erosion Resistance of Rocks to Fast Flowing Liquids

Libor Sitek, Petr Hlaváček, Petr Martinec, Lenka Bodnárová et autres

cz (code pays fourni par la source)

Topaz as a Potential Abrasive for Cutting and Surface Treatment of Materials by AWJ Technology

Petr Martinec, Libor Sitek, František Veselovský, Petr Hlaváček et autres

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The Principles of Evaluating the Risk of Rock and Gas Outburst in Copper Ore Mines

Norbert Skoczylas, Katarzyna Kozieł, Libor Sitek

Abstract Rock and gas outburst is one of the most significant natural hazards faced by the mining industry. In the last decade, this issue has appeared in firm rock mining (including copper ore mines) in addition to coal mining. A number of …

pl, cz (code pays fourni par la source)

Topaz quartzolite (greisen) in North Bohemia – potential source of the natural abrasive

Petr Martinec, Petr Hlaváček, Libor Sitek, Josef Foldyna et autres

Topazolite (greisen) is a rock formed essential by quartz and topaz, with accessory white mica, tourmaline, sulphides (molybdenite and arsenopyrite), wolframite and cassiterite. This rock was found in the Krkonoše and Jizera Mountains in the western Sudetes. In Poland, this metasomatic rock …

Utilising of water hammer effect for surface roughening of Ti6Al4V

Dagmar Klichová, Akash Nag, Jakub Poloprudský, Josef Foldyna et autres

Abstract There are many technological ways to activate biocompatible surfaces, but in some cases, there are not reliable for elderly patients. It has been found that surfaces created using pulsating water jets have a structure similar to trabecular bone structures. Such a …

cz, de, ch, sk (code pays fourni par la source)

Methods for the behaviour analysis of continuous flat water jet structures

Michal Zeleňák, Zdeněk Říha, Helena Votavová, Josef Foldyna et autres

cz (code pays fourni par la source)

Rock and Gas Outbursts in Copper Mines: Use of Brazilian Tests to Evaluate the Work of Disintegration of Rock Resulting from Stresses Produced by Gas Present in its Porous Structure

Katarzyna Kozieł, A. Nowakowski, Libor Sitek, Norbert Skoczylas

pl, cz (code pays fourni par la source)