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135 Publications


2024 | Journal Article | LibreCat-ID: 51518
O. K. Aimiyekagbon, A. Bender, T. Hemsel, and W. Sextro, “Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions,” Electronics, vol. 13, no. 3, Art. no. 521, 2024, doi: 10.3390/electronics13030521.
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2023 | Conference Abstract | LibreCat-ID: 47234
B. Sehlmeyer, R. Kampmann, C. Scheidemann, T. Hemsel, and M. Getzlaff, “Burst Mode of Ultrasonic Resonant Oscillations for Stimulation and Destruction of Tumor Cells,” in Frühjahrstagung 2023, Sektion Kondensierte Materie (SKM), Dresden, 2023.
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2023 | Conference Abstract | LibreCat-ID: 47235
R. Kampmann, B. Sehlmeyer, C. Scheidemann, T. Hemsel, and M. Getzlaff, “Burst Mode Characteristics of an Ultrasonic Transducer for Treatment of Cancer Cells,” in Frühjahrstagung 2023, Sektion Kondensierte Marterie (SKM), Dresden, 2023.
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2023 | Conference Abstract | LibreCat-ID: 51117
C. Scheidemann, T. Hemsel, O. Friesen, L. Claes, and W. Sextro, “Influence of Temperature and Pre-Stress on the Piezoelectric Material Behavior of Ring-Shaped Ceramics,” presented at the 7th International Conference on Advanced Electromaterials (ICAE 2023), Jeju, Korea, 2023.
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2023 | Conference Abstract | LibreCat-ID: 51118
C. Scheidemann, T. Hemsel, O. Friesen, L. Claes, and W. Sextro, “Influence of Temperature and Pre-Stress on the Piezoelectric Material Behavior of Ring-Shaped Ceramics,” presented at the International Conference on Functional Materials & Devices 2023 (ICFMD 2023), Incheon, Korea, 2023.
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2023 | Conference Abstract | LibreCat-ID: 51119
C. Scheidemann, O. E. C. Hagedorn, T. Hemsel, and W. Sextro, “Experimental Investigation of Bond Formation and Wire Deformation in the Ultrasonic Wire Bonding Process,” presented at the International Conference on Functional Materials & Devices 2023 (ICFMD 2023), Jeju, Korea, 2023.
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2022 | Book Chapter | LibreCat-ID: 33500
T. Hemsel and J. Twiefel, “Piezoelectric Ultrasonic Power Transducers,” in Reference Module in Materials Science and Materials Engineering, Elsevier, 2022.
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2022 | Conference Paper | LibreCat-ID: 30371
O. E. C. Hagedorn, M. Broll, O. Kirsch, T. Hemsel, and W. Sextro, “Experimental Investigation of the Influence of different Bond Tool Grooves on the Bond Quality for Ultrasonic Thick Wire Bonding,” in CIPS 2022 - 12th International Conference on Integrated Power Electronics Systems, Berlin, 2022, pp. 138–143.
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2022 | Conference Paper | LibreCat-ID: 34104
C. Scheidemann, O. Kirsch, T. Hemsel, and W. Sextro, “Experimental Investigation of Multidimensional Ultrasonic Heavy Wire Bonding,” 2022, doi: 10.1109/estc55720.2022.9939478.
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2022 | Report | LibreCat-ID: 52045
C. Scheidemann, T. Hemsel, and W. Sextro, Modellbasierte Ermittlung optimaler Prozessparameter für neuartige Ultraschallbondverbindungen. LibreCat University, 2022.
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2021 | Journal Article | LibreCat-ID: 21436
R. Schemmel, V. Krieger, T. Hemsel, and W. Sextro, “Co-simulation of MATLAB and ANSYS for ultrasonic wire bonding process optimization,” Microelectronics Reliability, vol. 119, p. 114077, 2021, doi: https://doi.org/10.1016/j.microrel.2021.114077.
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2020 | Conference Paper | LibreCat-ID: 17355
R. Schemmel, C. Scheidemann, T. Hemsel, O. Kirsch, and W. Sextro, “Experimental analysis and modelling of bond formation in ultrasonic heavy wire bonding,” in CIPS 2020; 11th International Conference on Integrated Power Electronics Systems, 2020, pp. 1–6.
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2020 | Conference Paper | LibreCat-ID: 17706
R. Schemmel, V. Krieger, T. Hemsel, and W. Sextro, “Co-simulation of MATLAB and ANSYS for ultrasonic wire bonding process optimization,” 2020, doi: 10.1109/eurosime48426.2020.9152679.
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2019 | Conference Paper | LibreCat-ID: 14852
P. Dunst, P. Bornmann, T. Hemsel, W. Littmann, and W. Sextro, “Atomization of Fluids with Ultrasound,” in Conference Proceedings - The 4th Conference on MicroFluidic Handling Systems (MFHS2019), Enschede, The Netherlands, 2019, pp. 140–143.
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2019 | Conference Paper | LibreCat-ID: 15244
O. E. C. Hagedorn, D. Pielsticker, T. Hemsel, and W. Sextro, “Messung hochfrequenter In-Plane-Schwingungen mittels Laservibrometrie in räumlich eingeschränkten Umgebungen,” in 2. VDI-Fachtagung Schwingungen 2019, 2019.
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2019 | Conference Paper | LibreCat-ID: 10258
P. Dunst, T. Hemsel, P. Bornmann, W. Littmann, and W. Sextro, “Modellbasierte und experimentelle Charakterisierung von intensiven Ultraschall-Stehwellenfeldern für die Zerstäubung hochviskoser Flüssigkeiten,” in DAGA 2019, Rostock, 2019.
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2019 | Journal Article | LibreCat-ID: 10334
R. Schemmel, T. Hemsel, C. Dymel, M. Hunstig, M. Brökelmann, and W. Sextro, “Using complex multi-dimensional vibration trajectories in ultrasonic bonding and welding,” Sensors and Actuators A: Physical, vol. 295, pp. 653–662, 2019, doi: 10.1016/j.sna.2019.04.025.
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2018 | Journal Article | LibreCat-ID: 9990
P. Dunst, P. Bornmann, T. Hemsel, W. Littmann, and W. Sextro, “Vibration Assisted Dosing, Mixing and Transport of Dry Fine Powders,” ACTUATOR 2018; 16th International Conference on New Actuators, pp. 142–145, 2018.
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2018 | Journal Article | LibreCat-ID: 9991
P. Dunst, P. Bornmann, T. Hemsel, and W. Sextro, “Vibration-Assisted Handling of Dry Fine Powders,” Actuators 2018, 7(2)., pp. 1–11, 2018.
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2018 | Conference Paper | LibreCat-ID: 9992
C. Dymel et al., “Numerical and statistical investigation of weld formation in a novel two-dimensional copper-copper bonding process,” in (Proceedings of 7th Electronics System-Integration Technology Conference, Dresden, Germany), 2018, pp. 1–6.
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2018 | Conference Paper | LibreCat-ID: 9993
C. Dymel, R. Schemmel, T. Hemsel, W. Sextro, M. Brökelmann, and M. Hunstig, “Experimental investigations on the impact of bond process parameters in two-dimensional ultrasonic copper bonding,” in (Proceedings of 8th Electronics IEEE CPMT Symposium Japan (ICSJ 2018), Kyoto, Japan), 2018, pp. 41–44.
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2018 | Conference Paper | LibreCat-ID: 9998
R. Schemmel, T. Hemsel, and W. Sextro, “Numerical and experimental investigations in ultrasonic heavy wire bonding,” in 6th European Conference on Computational Mechanics (ECCM 6), 2018, pp. 1–12.
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2017 | Journal Article | LibreCat-ID: 9972
P. Dunst, T. Hemsel, and W. Sextro, “Analysis of pipe vibration in an ultrasonic powder transportationsystem,” elsevier, vol. Sensors and Actuators A 263, pp. 733–736, 2017.
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2017 | Conference Paper | LibreCat-ID: 9978
J. K. Kimotho, W. Sextro, and T. Hemsel, “Estimation of Remaining Useful Lifetime of Piezoelectric Transducers Based on Self-Sensing,” in IEEE Transactions on Reliability, 2017, pp. 1–10.
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2017 | Conference Paper | LibreCat-ID: 9982
R. Schemmel, T. Hemsel, and W. Sextro, “MoRFUS: Mobile Reinigungseinheit für Förderketten basierend auf Ultraschall,” in 43. Deutsche Jahrestagung für Akustik, 2017, pp. 611–614.
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2016 | Conference Paper | LibreCat-ID: 9958
P. Dunst, W. Sextro, P. Bornmann, T. Hemsel, and W. Littmann, “Transportation of dry fine powders by coordinated friction manipulation,” in PAMM Proc. Appl. Math. Mech. 16, 2016, pp. 635–636.
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2015 | Journal Article | LibreCat-ID: 9944
P. Bornmann, T. Hemsel, W. Sextro, G. Memoli, M. Hodnett, and B. Zeqiri, “Kavitationsdetektion mittels Self-Sensing-Ultraschallwandler,” tm - Technisches Messen, vol. 82, no. 2, pp. 73–84, 2015.
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2015 | Journal Article | LibreCat-ID: 9948
R. Kudo, P. Bornmann, T. Hemsel, and T. Morita, “Thick KNbO 3 films deposited by ultrasonic-assisted hydrothermal method,” Acoustical Science and Technology, vol. 36, no. 3, pp. 262–264, 2015.
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2014 | Conference Paper | LibreCat-ID: 9868
S. Althoff, J. Neuhaus, T. Hemsel, and W. Sextro, “Improving the bond quality of copper wire bonds using a friction model approach,” in Electronic Components and Technology Conference (ECTC), 2014 IEEE 64th, 2014, pp. 1549–1555.
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2014 | Conference Paper | LibreCat-ID: 9869
P. Bornmann, T. Hemsel, W. Sextro, G. Memoli, M. Hodnett, and B. Zeqiri, “Self-Sensing Ultrasound Transducer for Cavitation Detection,” in 2014 IEEE International Ultrasonics Symposium Proceedings, 2014, pp. 663–666.
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2014 | Journal Article | LibreCat-ID: 9874
T. Hemsel, P. Bornmann, T. Morita, C. Sondermann-Wölke, and W. Sextro, “Reliability analysis of ultrasonic power transducers,” Archive of Applied Mechanics, pp. 1–7, 2014.
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2014 | Journal Article | LibreCat-ID: 9876
M. Hunstig, T. Hemsel, and W. Sextro, “High-velocity operation of piezoelectric inertia motors: experimental validation,” Archive of Applied Mechanics, pp. 1–9, 2014.
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2014 | Journal Article | LibreCat-ID: 9878
G. Isobe, T. Maeda, P. Bornmann, T. Hemsel, and T. Morita, “Synthesis of lead-free piezoelectric powders by ultrasonic-assisted hydrothermal method and properties of sintered (K0.48Na0.52)NBO3 ceramics,” Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on, vol. 61, no. 2, pp. 225–230, 2014.
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2013 | Journal Article | LibreCat-ID: 9794
W. Al-Ashtari, M. Hunstig, T. Hemsel, and W. Sextro, “Increasing the power of piezoelectric energy harvesters by magnetic stiffening,” Journal of Intelligent Material Systems and Structures, vol. 24, no. 11, pp. 1332–1342, 2013.
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2013 | Journal Article | LibreCat-ID: 9795
W. Al-Ashtari, M. Hunstig, T. Hemsel, and W. Sextro, “Enhanced energy harvesting using multiple piezoelectric elements: Theory and experiments,” Sensors and Actuators A: Physical, vol. 200, pp. 138–146, 2013.
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2013 | Conference Paper | LibreCat-ID: 9796
W. Al-Ashtari, M. Hunstig, T. Hemsel, and W. Sextro, “Characteristics of Piezoelectric Energy Harvesters in Autonomous Systems,” in Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop, Hannover, Germany, 14.-17.7.2013, 2013, no. 05/2013, pp. 159–161.
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2013 | Conference Paper | LibreCat-ID: 9797
S. Althoff, J. Neuhaus, T. Hemsel, and W. Sextro, “A friction based approach for modeling wire bonding,” in IMAPS 2013, 46th International Symposium on Microelectronics, 2013.
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2013 | Conference Paper | LibreCat-ID: 9801
M. Hunstig, W. Al-Ashtari, T. Hemsel, and W. Sextro, “Leistungs- und Bandbreitensteigerung von Energy-Harvesting-Generatoren für Energieautarke Systeme,” in 9. Paderborner Workshop Entwurf mechatronischer Systeme, 2013, pp. 359–372.
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2013 | Conference Paper | LibreCat-ID: 9802
M. Hunstig, T. Hemsel, and W. Sextro, “High-Velocity Slip-Slip Operation of Piezoelectric Inertia Motors - Experimental Validation,” in Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop, 2013, pp. 16–18.
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2013 | Journal Article | LibreCat-ID: 9803
M. Hunstig, T. Hemsel, and W. Sextro, “Modelling the friction contact in an inertia motor,” Journal of Intelligent Material Systems and Structures, vol. 24, no. 11, pp. 1380–1391, 2013.
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2013 | Journal Article | LibreCat-ID: 9804
M. Hunstig, T. Hemsel, and W. Sextro, “Stick-slip and slip-slip operation of piezoelectric inertia drives - Part II: Frequency-limited excitation,” Sensors and Actuators A: Physical, vol. 200, pp. 79–89, 2013.
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2013 | Journal Article | LibreCat-ID: 9805
M. Hunstig, T. Hemsel, and W. Sextro, “Stick-slip and slip-slip operation of piezoelectric inertia drives - Part I: Ideal Excitation.,” Sensors and Actuators A: Physical, vol. 200, pp. 90–100, 2013.
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2013 | Special Issue | LibreCat-ID: 9863
T. Morita et al., Eds., Selected Papers from the 9th International Workshop on Piezoelectric Materials and Applications in Actuators, vol. 200. Elsevier, 2013, pp. 1–172.
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2013 | Journal Article | LibreCat-ID: 9866
K. Ohta, G. Isobe, P. Bornmann, T. Hemsel, and T. Morita, “Study on optimizing ultrasonic irradiation period for thick polycrystalline PZT film by hydrothermal method,” Ultrasonics, vol. 53, no. 4, pp. 837–841, 2013.
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2013 | Journal Article | LibreCat-ID: 9867
Y. Yokouchi, T. Maeda, P. Bornmann, T. Hemsel, and T. Morita, “Piezoelectric Properties of CuO-Doped (K,Na)NbO3 Lead-Free Ceramics Synthesized with Hydrothermal Powders,” Japanese Journal of Applied Physics, vol. 52, no. 7S, 2013.
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2012 | Journal Article | LibreCat-ID: 9781
W. Al-Ashtari, M. Hunstig, T. Hemsel, and W. Sextro, “Frequency tuning of piezoelectric energy harvesters by magnetic force,” Smart Materials and Structures, vol. 21, no. 3, p. 035019, 2012.
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2012 | Journal Article | LibreCat-ID: 9782
W. Al-Ashtari, M. Hunstig, T. Hemsel, and W. Sextro, “Analytical determination of characteristic frequencies and equivalent circuit parameters of a piezoelectric bimorph,” Journal of Intelligent Material Systems and Structures, vol. 23, no. 1, pp. 15–23, 2012.
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2012 | Conference Paper | LibreCat-ID: 9783
P. Bornmann, T. Hemsel, W. Sextro, T. Maeda, and T. Morita, “Non-perturbing cavitation detection / monitoring in sonochemical reactors,” in Ultrasonics Symposium (IUS), 2012 IEEE International, 2012, pp. 1141–1144.
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2012 | Conference Paper | LibreCat-ID: 9785
G. Isobe, R. Ageba, T. Maeda, P. Bornmann, T. Hemsel, and T. Morita, “Synthesis of piezoelectric materials by ultrasonic assisted hydrothermal method,” in AIP Conference Proceedings, 2012, vol. 1433, no. 1, pp. 569–572.
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2012 | Conference Paper | LibreCat-ID: 9788
T. Maeda, P. Bornmann, T. Hemsel, and T. Morita, “Piezoelectric applications of hydrothermal lead-free (K0.48Na0.52)NbO3 ceramics,” in Ultrasonics Symposium (IUS), 2012 IEEE International, 2012, pp. 194–195.
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