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[citace_text] => ŠNAJDER, J.; BEDNAŘÍK, J. Czech Sign Language Single Hand Alphabet Classification with MediaPipe. ENGINEERING MECHANICS 2022. Engineering Mechanics .... Prague: Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, 2022. p. 381-384. ISBN: ISBN 978-80-86246-51. ISSN: 1805-8256.
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[citace_rtf] =>
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author="Jan {Šnajder} and Josef {Bednařík}",
title="Czech Sign Language Single Hand Alphabet Classification with MediaPipe",
booktitle="ENGINEERING MECHANICS 2022",
year="2022",
journal="Engineering Mechanics ....",
number="1",
pages="381--384",
publisher="Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences",
address="Prague",
doi="10.21495/512381",
isbn="ISBN 978-80-86246-51",
issn="1805-8256",
url="https://www.engmech.cz/improc/2022/381.pdf"
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[nazev_en] => Czech Sign Language Single Hand Alphabet Classification with MediaPipe
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of the EA4T steel, which were subjected to cyclic loading. The methodology of constant plastic
component of CTOD along the crack front was used in finite element modeling. Results confirm
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author="Radek {Kubíček} and Tomáš {Oplt} and Tomáš {Vojtek} and Luboš {Náhlík} and Pavel {Hutař}",
title="Crack Front Shape Based on Plastic Component of CTOD",
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publisher="Czech Technical University in Prague",
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[citace_text] => VOJTEK, T.; KUBÍČEK, R.; POKORNÝ, P.; JAMBOR, M.; HUTAŘ, P. CONCEPTUAL PROBLEMS WITH FATIGUE CRACK CLOSURE AND PLASTICITY: INFLUENCE OF CYCLIC SOFTENING. Sixth IJFatigue & FFEMS Joint Workshop Characterisation of Crack/Notch Tip Fields under Static, Dynamic or Cyclic loading - Book of Abstracts. Zagreb: University of Zagreb, 2022. p. 32-32. ISBN: 978-953-7738-83-9.
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author="Tomáš {Vojtek} and Radek {Kubíček} and Pavel {Pokorný} and Michal {Jambor} and Pavel {Hutař}",
title="CONCEPTUAL PROBLEMS WITH FATIGUE CRACK CLOSURE AND PLASTICITY: INFLUENCE OF CYCLIC SOFTENING",
booktitle="Sixth IJFatigue & FFEMS Joint Workshop Characterisation of Crack/Notch Tip Fields under Static, Dynamic or Cyclic loading - Book of Abstracts",
year="2022",
pages="32--32",
publisher="University of Zagreb",
address="Zagreb",
isbn="978-953-7738-83-9",
note="Abstract"
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[nazev] => Universal Procedure for Correction of Plasticity Effect in Hole‑Drilling Uniform Residual Stress Measurement
[nazev_orig] => Universal Procedure for Correction of Plasticity Effect in Hole‑Drilling Uniform Residual Stress Measurement
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[popis] => Background The hole-drilling method is a well-known and widely used technique for the determination of residual stresses, but is limited to materials with linear elastic behaviour. This can be a problem when high residual stresses are measured, since a local yielding can occur due to stress concentration around the drilled hole. Objective If the residual stress exceeds about 80% of the material yield stress, the error caused by the plasticity effect becomes significant. In order to correctly evaluate high uniform residual stresses, a universal procedure for a correction of the plasticity effect is introduced. Methods The procedure uses a neural network and is capable of correcting any combination of uniform residual stresses with magnitudes up to the material yield stress. It also covers a wide range of material parameters, hole diameters, and strain gauge rosettes and it is independent of the orientation of the strain gauge rosette. Results The correction procedure was tested by more than a million randomly generated stress states that covered the entire range of input parameters and performs remarkably well, since the error of the corrected residual stresses is negligible even for the states with residual stress magnitudes equal to the material yield stress. Conclusions The proposed correction extends the application range of the hole-drilling method to high uniform residual stresses and therefore can be very useful for practical measurements.
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[klicova_slova] => Hole-drilling method; Residual stress; Plasticity efect; Correction procedure; Neural network; Finite element
simulations
[klicova_slova_orig] => Hole-drilling method; Residual stress; Plasticity efect; Correction procedure; Neural network; Finite element
simulations
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[citace_text] => HALABUK, D.; NÁVRAT, T. Universal Procedure for Correction of Plasticity Effect in Hole‑Drilling Uniform Residual Stress Measurement. Experimental Mechanics, 2022, vol. 62, no. 8, p. 1267-1287. ISSN: 0014-4851.
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author="Dávid {Halabuk} and Tomáš {Návrat}",
title="Universal Procedure for Correction of Plasticity Effect in Hole‑Drilling Uniform Residual Stress Measurement",
journal="Experimental Mechanics",
year="2022",
volume="62",
number="8",
pages="1267--1287",
doi="10.1007/s11340-022-00869-z",
issn="0014-4851",
url="https://link.springer.com/article/10.1007/s11340-022-00869-z"
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[nazev_en] => Universal Procedure for Correction of Plasticity Effect in Hole‑Drilling Uniform Residual Stress Measurement
[popis_en] => Background The hole-drilling method is a well-known and widely used technique for the determination of residual stresses, but is limited to materials with linear elastic behaviour. This can be a problem when high residual stresses are measured, since a local yielding can occur due to stress concentration around the drilled hole. Objective If the residual stress exceeds about 80% of the material yield stress, the error caused by the plasticity effect becomes significant. In order to correctly evaluate high uniform residual stresses, a universal procedure for a correction of the plasticity effect is introduced. Methods The procedure uses a neural network and is capable of correcting any combination of uniform residual stresses with magnitudes up to the material yield stress. It also covers a wide range of material parameters, hole diameters, and strain gauge rosettes and it is independent of the orientation of the strain gauge rosette. Results The correction procedure was tested by more than a million randomly generated stress states that covered the entire range of input parameters and performs remarkably well, since the error of the corrected residual stresses is negligible even for the states with residual stress magnitudes equal to the material yield stress. Conclusions The proposed correction extends the application range of the hole-drilling method to high uniform residual stresses and therefore can be very useful for practical measurements.
[klicova_slova_en] => Hole-drilling method; Residual stress; Plasticity efect; Correction procedure; Neural network; Finite element
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title="Engineering Mechanics 2022",
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note="Holding a conference"
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(
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[nazev] => The Prediction of Fatigue Life of Notched Specimens
[nazev_orig] => The Prediction of Fatigue Life of Notched Specimens
[duvernost_udaju_id] => S
[popis] => The contribution presents a method for
lifetime predictions of components with notches.
The method was developed using experimental data
gained on smooth and notched samples and numerical
analysis of notched specimens. The method employs
approaches of generalized fracture mechanics and uses
a critical length parameter. Emphasis is placed on the
area of gigacycle fatigue.
[popis_orig] => The contribution presents a method for
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The method was developed using experimental data
gained on smooth and notched samples and numerical
analysis of notched specimens. The method employs
approaches of generalized fracture mechanics and uses
a critical length parameter. Emphasis is placed on the
area of gigacycle fatigue.
[klicova_slova] => Wöhler curve; fatigue life; notches; generalized
fracture mechanics; stress distribution; gigacycle fatigue
[klicova_slova_orig] => Wöhler curve; fatigue life; notches; generalized
fracture mechanics; stress distribution; gigacycle fatigue
[url] => https://dspace.vsb.cz/handle/10084/145933
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[citace_html] => KOZÁKOVÁ, K.; KLUSÁK, J. The Prediction of Fatigue Life of Notched Specimens. Sborník vědeckých prací Vysoké školy báňské – Technické univerzity Ostrava, 2021, vol. 21, no. 2, p. 29-35. ISSN: 1213-1962.
[citace_rtf] =>
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author="Kamila {Kozáková} and Jan {Klusák}",
title="The Prediction of Fatigue Life of Notched Specimens",
journal="Sborník vědeckých prací Vysoké školy báňské – Technické univerzity Ostrava",
year="2021",
volume="21",
number="2",
pages="29--35",
doi="10.35181/tces-2021-0010",
issn="1213-1962",
url="https://dspace.vsb.cz/handle/10084/145933"
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lifetime predictions of components with notches.
The method was developed using experimental data
gained on smooth and notched samples and numerical
analysis of notched specimens. The method employs
approaches of generalized fracture mechanics and uses
a critical length parameter. Emphasis is placed on the
area of gigacycle fatigue.
[klicova_slova_en] => Wöhler curve; fatigue life; notches; generalized
fracture mechanics; stress distribution; gigacycle fatigue
[vysledek_datum] => 2021-12-31T00:00:00+01:00
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[citace_text] => 38th Danubia-Adria Symposium on Advances in Experimental Mechanics (DAS38). Poros (20.09.2022)
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[citace_rtf] =>
[citace_bibtex] => @misc{BUT179446,
title="38th Danubia-Adria Symposium on Advances in Experimental Mechanics (DAS38)",
year="2022",
url="https://www.38danubia.org/",
note="Holding a conference"
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[nazev_en] => 38th Danubia-Adria Symposium on Advances in Experimental Mechanics (DAS38)
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[vysledek_id] => 179447
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[nazev] => Wear Measurement of the Water-Lubricated Tilting-Pad Journal Bearing: Comparison of PEEK and CuBe materials
[nazev_orig] => Wear Measurement of the Water-Lubricated Tilting-Pad Journal Bearing: Comparison of PEEK and CuBe materials
[duvernost_udaju_id] => S
[popis] => Hydrodynamic tilting-pad journal bearings are
used in high-speed applications with vibration
resistance requirements. Tilting-pad bearings
consist of three or more pads which can be tilted.
Due to this feature, these bearings have much higher
stability in operation than other fixed geometry
hydrodynamic bearings. Increasingly, bearings
lubricated with lower viscosity fluids such as water
are becoming more popular, allowing them to be
used in clean applications without polluting the
environment with oil particles. Wear on the
bearing sliding surfaces is also an important factor
in these applications, not only in terms of bearing
life but also in terms of lubricant contamination.
Therefore, this paper is focused specifically on
bearing wear measurement.
[popis_orig] => Hydrodynamic tilting-pad journal bearings are
used in high-speed applications with vibration
resistance requirements. Tilting-pad bearings
consist of three or more pads which can be tilted.
Due to this feature, these bearings have much higher
stability in operation than other fixed geometry
hydrodynamic bearings. Increasingly, bearings
lubricated with lower viscosity fluids such as water
are becoming more popular, allowing them to be
used in clean applications without polluting the
environment with oil particles. Wear on the
bearing sliding surfaces is also an important factor
in these applications, not only in terms of bearing
life but also in terms of lubricant contamination.
Therefore, this paper is focused specifically on
bearing wear measurement.
[klicova_slova] => wear measurement; tilting-pad journal bearing; water-lubricated; CuBe; PEEK
[klicova_slova_orig] => wear measurement; tilting-pad journal bearing; water-lubricated; CuBe; PEEK
[url] =>
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[ins_ts] => 2025-09-22
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[identifikator] => ISBN 978-618-86278-0-2
[identifikator_popis] => ISBN - Proceedings of 38th Danubia-Adria Symposium on Advances in Experimental Mechanics
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[citace_text] => POKORNÝ, J.; NÁVRAT, T.; VAJDÁK, M. Wear Measurement of the Water-Lubricated Tilting-Pad Journal Bearing: Comparison of PEEK and CuBe materials. In Proceedings of 38th Danubia-Adria Symposium on Advances in Experimental Mechanics. Poros: Greek Society of Experimental Mechanics of Materials, 2022. 2 p. ISBN: 978-618-86278-0-2.
[citace_html] => POKORNÝ, J.; NÁVRAT, T.; VAJDÁK, M. Wear Measurement of the Water-Lubricated Tilting-Pad Journal Bearing: Comparison of PEEK and CuBe materials. In Proceedings of 38th Danubia-Adria Symposium on Advances in Experimental Mechanics. Poros: Greek Society of Experimental Mechanics of Materials, 2022. 2 p. ISBN: 978-618-86278-0-2.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT179447,
author="Jan {Pokorný} and Tomáš {Návrat} and Michal {Vajdák}",
title="Wear Measurement of the Water-Lubricated Tilting-Pad Journal Bearing: Comparison of PEEK and CuBe materials",
booktitle="Proceedings of 38th Danubia-Adria Symposium on Advances in Experimental Mechanics",
year="2022",
pages="2",
publisher="Greek Society of Experimental Mechanics of Materials",
address="Poros",
isbn="978-618-86278-0-2"
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[poznamka_metriky] =>
[nazev_en] => Wear Measurement of the Water-Lubricated Tilting-Pad Journal Bearing: Comparison of PEEK and CuBe materials
[popis_en] => Hydrodynamic tilting-pad journal bearings are
used in high-speed applications with vibration
resistance requirements. Tilting-pad bearings
consist of three or more pads which can be tilted.
Due to this feature, these bearings have much higher
stability in operation than other fixed geometry
hydrodynamic bearings. Increasingly, bearings
lubricated with lower viscosity fluids such as water
are becoming more popular, allowing them to be
used in clean applications without polluting the
environment with oil particles. Wear on the
bearing sliding surfaces is also an important factor
in these applications, not only in terms of bearing
life but also in terms of lubricant contamination.
Therefore, this paper is focused specifically on
bearing wear measurement.
[klicova_slova_en] => wear measurement; tilting-pad journal bearing; water-lubricated; CuBe; PEEK
[vysledek_datum] => 2022-09-20T00:00:00+02:00
)
[10] => Array
(
[vysledek_id] => 179466
[vysledek_druh_id] => CONPA
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[nazev] => VALIDATION OF CRACK LENGTH MEASUREMENT METHOD WITH DIGITAL IMAGE CORRELATION FOR FATIGUE TESTS
[nazev_orig] => VALIDATION OF CRACK LENGTH MEASUREMENT METHOD WITH DIGITAL IMAGE CORRELATION FOR FATIGUE TESTS
[duvernost_udaju_id] => S
[popis] => Digital image correlation (DIC) as a nondestructive contactless technique for real-time surface deformations measurement have become a powerful tool in various applications. It still has great potential in areas such as fracture mechanics (FM), where crack length is important to evaluate fatigue properties of the material, often measured by travelling microscope. The test is frequently stopped and the microscope is manually used,
which takes a long time and the result is strongly dependent on the technician. Automated DIC measurement could help to solve these issues.
Therefore, this paper is focused on validation of the method, which would enable such automation and could be more robust and accurate than currently used DIC methods for crack length measurement.
[popis_orig] => Digital image correlation (DIC) as a nondestructive contactless technique for real-time surface deformations measurement have become a powerful tool in various applications. It still has great potential in areas such as fracture mechanics (FM), where crack length is important to evaluate fatigue properties of the material, often measured by travelling microscope. The test is frequently stopped and the microscope is manually used,
which takes a long time and the result is strongly dependent on the technician. Automated DIC measurement could help to solve these issues.
Therefore, this paper is focused on validation of the method, which would enable such automation and could be more robust and accurate than currently used DIC methods for crack length measurement.
[klicova_slova] => Digital image correlation; DIC; Crack length measurement; Crack opening displacement; COD; Inflection point
[klicova_slova_orig] => Digital image correlation; DIC; Crack length measurement; Crack opening displacement; COD; Inflection point
[url] =>
[oecd_obor_id] => 20302
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[odpovedny_utvar_nazev] => Ústav mechaniky těles, mechatroniky a biomechaniky
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[originalni_jazyk] => en
[schvalil_id] => 254501
[schvaleno] => 2023-03-01
[vykazovat_riv] => 1
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[slozka_id] =>
[posledni_diagnostika] =>
[vycet_osob] => ŠČERBA, B.; ADAMEC, T.; NÁVRAT, T.
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[ins_ts] => 2025-09-22
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[identifikator] => ISBN 978-618-86278-0-2
[identifikator_popis] => ISBN - Proceedings of 38th Danubia-Adria Symposium on Advances in Experimental Mechanics
[riv_dodavka_id] => 2990
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[citace_text] => ŠČERBA, B.; ADAMEC, T.; NÁVRAT, T. VALIDATION OF CRACK LENGTH MEASUREMENT METHOD WITH DIGITAL IMAGE CORRELATION FOR FATIGUE TESTS. In Proceedings of 38th Danubia-Adria Symposium on Advances in Experimental Mechanics. Poros: Greek Society of Experimental Mechanics of Materials, 2022. 2 p. ISBN: 978-618-86278-0-2.
[citace_html] => ŠČERBA, B.; ADAMEC, T.; NÁVRAT, T. VALIDATION OF CRACK LENGTH MEASUREMENT METHOD WITH DIGITAL IMAGE CORRELATION FOR FATIGUE TESTS. In Proceedings of 38th Danubia-Adria Symposium on Advances in Experimental Mechanics. Poros: Greek Society of Experimental Mechanics of Materials, 2022. 2 p. ISBN: 978-618-86278-0-2.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT179466,
author="Bořek {Ščerba} and Tomáš {Adamec} and Tomáš {Návrat}",
title="VALIDATION OF CRACK LENGTH MEASUREMENT METHOD WITH DIGITAL IMAGE CORRELATION FOR FATIGUE TESTS",
booktitle="Proceedings of 38th Danubia-Adria Symposium on Advances in Experimental Mechanics",
year="2022",
pages="2",
publisher="Greek Society of Experimental Mechanics of Materials",
address="Poros",
isbn="978-618-86278-0-2"
}
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[poznamka_metriky] =>
[nazev_en] => VALIDATION OF CRACK LENGTH MEASUREMENT METHOD WITH DIGITAL IMAGE CORRELATION FOR FATIGUE TESTS
[popis_en] => Digital image correlation (DIC) as a nondestructive contactless technique for real-time surface deformations measurement have become a powerful tool in various applications. It still has great potential in areas such as fracture mechanics (FM), where crack length is important to evaluate fatigue properties of the material, often measured by travelling microscope. The test is frequently stopped and the microscope is manually used,
which takes a long time and the result is strongly dependent on the technician. Automated DIC measurement could help to solve these issues.
Therefore, this paper is focused on validation of the method, which would enable such automation and could be more robust and accurate than currently used DIC methods for crack length measurement.
[klicova_slova_en] => Digital image correlation; DIC; Crack length measurement; Crack opening displacement; COD; Inflection point
[vysledek_datum] => 2022-09-20T00:00:00+02:00
)
[11] => Array
(
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[nazev] => Achievable accuracy of resonating nanomechanical systems for mass sensing of larger analytes in GDa range
[nazev_orig] => Achievable accuracy of resonating nanomechanical systems for mass sensing of larger analytes in GDa range
[duvernost_udaju_id] => S
[popis] => Measurement of larger analytes such as many chemical and biological structures or viruses in gigadalton (GDa) range is a reminding fundamental task in analytical chemistry and life sciences, which can be possibly resolved with the resonating nanomechanical systems. Common approaches to mass sensing with these systems model the bound analyte as a point particle and assume the analyte does not change the vibrational mode shapes. However, for larger analytes their stiffness and size not only affect the resonant frequencies but also cause the significant changes in the vibrational mode shapes making their measurement highly challenging and still under-explored problem. Here, we develop a 3D model capable to accurately predict the resonant frequencies and vibrational mode shapes of the resonating nanomechanical systems with the bound analyte of arbitrary properties and size. Then, we examine in details the impact of analyte properties, size and its position of attachment on the resonant frequencies and vibrational mode shapes and, correspondingly, resolve a dispute over the achievable detection limits of the nanomechanical systems, especially for mass sensing of larger analytes. Furthermore, we identify three different sensing regimes, that is, the ultra-light, light and heavy, for which the effects of the analyte mass, stiffness, its size and the position of attachment on the accuracy of the determined mass can be separated. For the ultra-light regime (mass ratio < 10-3) the analyte stiffness and its size affect notably the resonant frequencies, the point mass approximation is inaccurate and the analyte can be identified by its mass and stiffness. For the light regime the point mass approximation is accurate, while for the heavy one (mass ratio > 2 center dot 10- 2) the mass effect dominates the frequency response and alters the vibrational mode shapes which, for the common approaches, yields the errors in the determined analyte mass. Finally, we also propose an easily accessible approach for the identification of larger analytes (in GDa range) that does not require the advanced computational tools or experimental setup, applicable to the majority of the clamped-clamped ends resonating nanomechanical systems.
[popis_orig] => Measurement of larger analytes such as many chemical and biological structures or viruses in gigadalton (GDa) range is a reminding fundamental task in analytical chemistry and life sciences, which can be possibly resolved with the resonating nanomechanical systems. Common approaches to mass sensing with these systems model the bound analyte as a point particle and assume the analyte does not change the vibrational mode shapes. However, for larger analytes their stiffness and size not only affect the resonant frequencies but also cause the significant changes in the vibrational mode shapes making their measurement highly challenging and still under-explored problem. Here, we develop a 3D model capable to accurately predict the resonant frequencies and vibrational mode shapes of the resonating nanomechanical systems with the bound analyte of arbitrary properties and size. Then, we examine in details the impact of analyte properties, size and its position of attachment on the resonant frequencies and vibrational mode shapes and, correspondingly, resolve a dispute over the achievable detection limits of the nanomechanical systems, especially for mass sensing of larger analytes. Furthermore, we identify three different sensing regimes, that is, the ultra-light, light and heavy, for which the effects of the analyte mass, stiffness, its size and the position of attachment on the accuracy of the determined mass can be separated. For the ultra-light regime (mass ratio < 10-3) the analyte stiffness and its size affect notably the resonant frequencies, the point mass approximation is inaccurate and the analyte can be identified by its mass and stiffness. For the light regime the point mass approximation is accurate, while for the heavy one (mass ratio > 2 center dot 10- 2) the mass effect dominates the frequency response and alters the vibrational mode shapes which, for the common approaches, yields the errors in the determined analyte mass. Finally, we also propose an easily accessible approach for the identification of larger analytes (in GDa range) that does not require the advanced computational tools or experimental setup, applicable to the majority of the clamped-clamped ends resonating nanomechanical systems.
[klicova_slova] => Nanomechanical resonator; Mass sensing; Heavy mass spectrometry; FEM; Resonant frequency
[klicova_slova_orig] => Nanomechanical resonator; Mass sensing; Heavy mass spectrometry; FEM; Resonant frequency
[url] => https://www.sciencedirect.com/science/article/pii/S0020740322002636?pes=vor
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[nadrazena_soucast_nazev] => Fakulta strojního inženýrství
[originalni_jazyk] => en
[schvalil_id] => 17485
[schvaleno] => 2022-10-12
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[slozka_id] =>
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[vycet_osob] => STACHIV, I.; MACHŮ, Z.; ŠEVEČEK, O.; JENG, Y.; LI, W.; KOTOUL, M.; PRÁŠEK, J.
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[druh_popis] => Článek v odborném periodiku je obsažen v databázi Web of Science společností Thomson Reuters s příznakem „Article“, „Review“ nebo „Letter“
[stav] => Schválený
[vysledek_kategorie_id] => PV
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[ins_ts] => 2025-09-22
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[identifikator] => ISSN 0020-7403
[identifikator_popis] => ISSN - International Journal of Mechanical Sciences (GB)
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[citace_text] => STACHIV, I.; MACHŮ, Z.; ŠEVEČEK, O.; JENG, Y.; LI, W.; KOTOUL, M.; PRÁŠEK, J. Achievable accuracy of resonating nanomechanical systems for mass sensing of larger analytes in GDa range. International Journal of Mechanical Sciences, 2022, vol. 224, no. červen, p. 1-15. ISSN: 0020-7403.
[citace_html] => STACHIV, I.; MACHŮ, Z.; ŠEVEČEK, O.; JENG, Y.; LI, W.; KOTOUL, M.; PRÁŠEK, J. Achievable accuracy of resonating nanomechanical systems for mass sensing of larger analytes in GDa range. International Journal of Mechanical Sciences, 2022, vol. 224, no. červen, p. 1-15. ISSN: 0020-7403.
[citace_rtf] =>
[citace_bibtex] => @article{BUT179484,
author="STACHIV, I. and MACHŮ, Z. and ŠEVEČEK, O. and JENG, Y. and LI, W. and KOTOUL, M. and PRÁŠEK, J.",
title="Achievable accuracy of resonating nanomechanical systems for mass sensing of larger analytes in GDa range",
journal="International Journal of Mechanical Sciences",
year="2022",
volume="224",
number="červen",
pages="1--15",
doi="10.1016/j.ijmecsci.2022.107353",
issn="0020-7403",
url="https://www.sciencedirect.com/science/article/pii/S0020740322002636?pes=vor"
}
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[nazev_en] => Achievable accuracy of resonating nanomechanical systems for mass sensing of larger analytes in GDa range
[popis_en] => Measurement of larger analytes such as many chemical and biological structures or viruses in gigadalton (GDa) range is a reminding fundamental task in analytical chemistry and life sciences, which can be possibly resolved with the resonating nanomechanical systems. Common approaches to mass sensing with these systems model the bound analyte as a point particle and assume the analyte does not change the vibrational mode shapes. However, for larger analytes their stiffness and size not only affect the resonant frequencies but also cause the significant changes in the vibrational mode shapes making their measurement highly challenging and still under-explored problem. Here, we develop a 3D model capable to accurately predict the resonant frequencies and vibrational mode shapes of the resonating nanomechanical systems with the bound analyte of arbitrary properties and size. Then, we examine in details the impact of analyte properties, size and its position of attachment on the resonant frequencies and vibrational mode shapes and, correspondingly, resolve a dispute over the achievable detection limits of the nanomechanical systems, especially for mass sensing of larger analytes. Furthermore, we identify three different sensing regimes, that is, the ultra-light, light and heavy, for which the effects of the analyte mass, stiffness, its size and the position of attachment on the accuracy of the determined mass can be separated. For the ultra-light regime (mass ratio < 10-3) the analyte stiffness and its size affect notably the resonant frequencies, the point mass approximation is inaccurate and the analyte can be identified by its mass and stiffness. For the light regime the point mass approximation is accurate, while for the heavy one (mass ratio > 2 center dot 10- 2) the mass effect dominates the frequency response and alters the vibrational mode shapes which, for the common approaches, yields the errors in the determined analyte mass. Finally, we also propose an easily accessible approach for the identification of larger analytes (in GDa range) that does not require the advanced computational tools or experimental setup, applicable to the majority of the clamped-clamped ends resonating nanomechanical systems.
[klicova_slova_en] => Nanomechanical resonator; Mass sensing; Heavy mass spectrometry; FEM; Resonant frequency
[vysledek_datum] => 2022-06-15T00:00:00+02:00
)
[12] => Array
(
[vysledek_id] => 179960
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[nazev] => Investigation of Microstructure and Mechanical Properties of
SLM-Fabricated AlSi10Mg Alloy Post-Processed Using Equal
Channel Angular Pressing (ECAP)
[nazev_orig] => Investigation of Microstructure and Mechanical Properties of
SLM-Fabricated AlSi10Mg Alloy Post-Processed Using Equal
Channel Angular Pressing (ECAP)
[duvernost_udaju_id] => S
[popis] => With the aim of improving the excellent mechanical properties of the SLM-produced
AlSi10Mg alloy, this research focuses on post-processing using ECAP (Equal Channel Angular Pressing).
In our article, two different post-processing strategies were investigated: (1) low-temperature
annealing (LTA) and subsequent ECAP processing at 150 C; (2) no heat treatment and subsequent
ECAP processing at 350 C, 400 C and 450 C. The microstructure and mechanical properties of this
alloy were analyzed at each stage of post-treatment. Metallographic observations, combined with
SEM and EBSD studies, showed that the alloys produced by SLM have a unique cellular microstructure
consisting of Si networks surrounding the Al-based matrix phase. Low-temperature annealing
(LTA), followed by ECAP treatment, facilitated the microstructural evolution of the alloy with partial
breakup of the Si network and observed nucleation of -Si precipitates throughout the Al matrix.
This resulted in a Vickers microhardness of 153 HV and a yield strength of 415 MPa. The main results
show that post-processing of SLM-produced AlSi10Mg alloys using ECAP significantly affects the
microstructural evolution and mechanical properties of the alloy.
[popis_orig] => With the aim of improving the excellent mechanical properties of the SLM-produced
AlSi10Mg alloy, this research focuses on post-processing using ECAP (Equal Channel Angular Pressing).
In our article, two different post-processing strategies were investigated: (1) low-temperature
annealing (LTA) and subsequent ECAP processing at 150 C; (2) no heat treatment and subsequent
ECAP processing at 350 C, 400 C and 450 C. The microstructure and mechanical properties of this
alloy were analyzed at each stage of post-treatment. Metallographic observations, combined with
SEM and EBSD studies, showed that the alloys produced by SLM have a unique cellular microstructure
consisting of Si networks surrounding the Al-based matrix phase. Low-temperature annealing
(LTA), followed by ECAP treatment, facilitated the microstructural evolution of the alloy with partial
breakup of the Si network and observed nucleation of -Si precipitates throughout the Al matrix.
This resulted in a Vickers microhardness of 153 HV and a yield strength of 415 MPa. The main results
show that post-processing of SLM-produced AlSi10Mg alloys using ECAP significantly affects the
microstructural evolution and mechanical properties of the alloy.
[klicova_slova] => AlSi10Mg alloy; equal channel angular pressing (ECAP); microstructure; microhardness;
yield strength; scanning electron microscopy; electron backscatter diffraction (EBSD)
[klicova_slova_orig] => AlSi10Mg alloy; equal channel angular pressing (ECAP); microstructure; microhardness;
yield strength; scanning electron microscopy; electron backscatter diffraction (EBSD)
[url] => https://www.mdpi.com/1996-1944/15/22/7940
[oecd_obor_id] => 20501
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[odpovedny_utvar_nazev] => Ústav mechaniky těles, mechatroniky a biomechaniky
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[nadrazena_soucast_nazev] => Fakulta strojního inženýrství
[originalni_jazyk] => en
[schvalil_id] => 182808
[schvaleno] => 2023-02-10
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[citace_text] => SNOPIŇSKI, P., APPIAH, A.N.S., HILŠER, O.,KOTOUL, M. Investigation of Microstructure and Mechanical Properties of SLM-Fabricated AlSi10Mg Alloy Post-Processed Using Equal Channel Angular Pressing (ECAP). Materials, 2022, vol. 15, no. 22, p. 7940-7940. ISSN: 1996-1944.
[citace_html] => SNOPIŇSKI, P., APPIAH, A.N.S., HILŠER, O.,KOTOUL, M. Investigation of Microstructure and Mechanical Properties of SLM-Fabricated AlSi10Mg Alloy Post-Processed Using Equal Channel Angular Pressing (ECAP). Materials, 2022, vol. 15, no. 22, p. 7940-7940. ISSN: 1996-1944.
[citace_rtf] =>
[citace_bibtex] => @article{BUT179960,
author="Michal {Kotoul}",
title="Investigation of Microstructure and Mechanical Properties of
SLM-Fabricated AlSi10Mg Alloy Post-Processed Using Equal
Channel Angular Pressing (ECAP)",
journal="Materials",
year="2022",
volume="15",
number="22",
pages="7940--7940",
doi="10.3390/ma15227940",
url="https://www.mdpi.com/1996-1944/15/22/7940"
}
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[nazev_en] => Investigation of Microstructure and Mechanical Properties of
SLM-Fabricated AlSi10Mg Alloy Post-Processed Using Equal
Channel Angular Pressing (ECAP)
[popis_en] => With the aim of improving the excellent mechanical properties of the SLM-produced
AlSi10Mg alloy, this research focuses on post-processing using ECAP (Equal Channel Angular Pressing).
In our article, two different post-processing strategies were investigated: (1) low-temperature
annealing (LTA) and subsequent ECAP processing at 150 C; (2) no heat treatment and subsequent
ECAP processing at 350 C, 400 C and 450 C. The microstructure and mechanical properties of this
alloy were analyzed at each stage of post-treatment. Metallographic observations, combined with
SEM and EBSD studies, showed that the alloys produced by SLM have a unique cellular microstructure
consisting of Si networks surrounding the Al-based matrix phase. Low-temperature annealing
(LTA), followed by ECAP treatment, facilitated the microstructural evolution of the alloy with partial
breakup of the Si network and observed nucleation of -Si precipitates throughout the Al matrix.
This resulted in a Vickers microhardness of 153 HV and a yield strength of 415 MPa. The main results
show that post-processing of SLM-produced AlSi10Mg alloys using ECAP significantly affects the
microstructural evolution and mechanical properties of the alloy.
[klicova_slova_en] => AlSi10Mg alloy; equal channel angular pressing (ECAP); microstructure; microhardness;
yield strength; scanning electron microscopy; electron backscatter diffraction (EBSD)
[vysledek_datum] => 2022-11-10T00:00:00+01:00
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[nazev] => ROLLER PUMP CONTROLLED BY NEURAL NETWORK: EXPERIMENTAL STUDY UNDER PHYSIOLOGICAL CONDITIONS
[nazev_orig] => ROLLER PUMP CONTROLLED BY NEURAL NETWORK: EXPERIMENTAL STUDY UNDER PHYSIOLOGICAL CONDITIONS
[duvernost_udaju_id] => S
[popis] => The paper aims at exploitation of neural networks to create a required pulse wave in a compliant hydraulic circuit, representing arterial architecture. The pulse wave is evoked with a roller pump with its rotation speed controlled by a step motor. Peripheral resistance is created by a system of compliant silicon tubes mimicking arterial tree. The measured pressure waves in two positions and their derivatives will be exploited as datasets to train the neural network and, in the end, to reach a more physiological shape of the pulse wave than can be reached by a manual setting.
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[klicova_slova] => Physiological waveform; Neural network; Roller pump
[klicova_slova_orig] => Physiological waveform; Neural network; Roller pump
[url] => https://www.compbiomed.net/getfile.php?type=16/site_documents&id=CMBE%202022%20Proceedings%20volume1.pdf
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[identifikator] => ISBN 978-0-9562914-6-2 ISSN 2227-9385
[identifikator_popis] => ISBN - CMBE22 7th International Conference on Computational & Mathematical Biomedical Engineering ISSN - 7th International Conference on Computational and Mathematical Biomedical Engineering – CMBE2021 (IT)
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[citace_text] => JAGOŠ, J.; KOHÚT, J.; KOHÚT, J.; FORMÁNEK, M.; BURŠA, J. ROLLER PUMP CONTROLLED BY NEURAL NETWORK: EXPERIMENTAL STUDY UNDER PHYSIOLOGICAL CONDITIONS. CMBE22 7th International Conference on Computational & Mathematical Biomedical Engineering. 7th International Conference on Computational and Mathematical Biomedical Engineering – CMBE2021. Cardiff, United Kingdom: Computational and scientific consultancy services Ltd, 2022. p. 389-392. ISBN: 978-0-9562914-6-2. ISSN: 2227-9385.
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[citace_rtf] =>
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author="Jiří {Jagoš} and Jiří {Kohút} and Jan {Kohút} and Martin {Formánek} and Jiří {Burša}",
title="ROLLER PUMP CONTROLLED BY NEURAL NETWORK: EXPERIMENTAL STUDY UNDER PHYSIOLOGICAL CONDITIONS",
booktitle="CMBE22 7th International Conference on Computational & Mathematical Biomedical Engineering",
year="2022",
journal="7th International Conference on Computational and Mathematical Biomedical Engineering – CMBE2021",
pages="389--392",
publisher="Computational and scientific consultancy services Ltd",
address="Cardiff, United Kingdom",
isbn="978-0-9562914-6-2",
issn="2227-9385",
url="https://www.compbiomed.net/getfile.php?type=16/site_documents&id=CMBE%202022%20Proceedings%20volume1.pdf"
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