Team > Dr. rer. nat. Nico Langhof

Faculty of Engineering Science
Chair of Ceramic Materials Engineering

Publications

2024

Matteo Mor, Matthias Meiser, Nico Langhof, Antonio Vinci, Luca Zoli, Bettina Alber-Laukant, Stephan Tremmel, Stefan Schafföner, Diletta Sciti: Dry tribological behavior of 0/90° continuous carbon fiber reinforced ZrB₂ based UHTC-material. In: Journal of the European Ceramic Society, 44 (2024). - .
doi:10.1016/j.jeurceramsoc.2024.06.005

Ludwig Richtmann, Thorsten Opel, Marina Maier, Nico Langhof, Stephan Clemens: Establishment of a system to analyze effects of airborne ultra-fine particulate matter from brake wear on plants under realistic exposure conditions. In: Journal of Hazardous Materials, 469 (2024). - .
doi:10.1016/j.jhazmat.2024.134084

Melissa Moos, Claudia Möhl, Olaf Reichert, Gregor Ohnemüller, Nico Langhof, Stephan Baz, Thorsten Opel, Götz T. Gresser, Stefan Schafföner: Novel approach for ceramic matrix composites : Cf/PEEK hybrid yarn-based C/C-SiC. In: Journal of the European Ceramic Society, 44 (2024). - S. 130-141.
doi:10.1016/j.jeurceramsoc.2023.09.005

Jalena Best, Wolfgang Freudenberg, Nico Langhof, Stefan Schafföner: Processing-microstructure correlations in material extrusion additive manufacturing of carbon fiber reinforced ceramic matrix composites. In: Additive Manufacturing, 79 (2024). - .
doi:10.1016/j.addma.2023.103888

Ilaria Bombarda, Carolin Sitzmann, Tom Liensdorf, Nico Langhof, Stefan Schafföner: Tensile testing of yittria-stabilized zirconia ceramic tapes for solid oxide cells. In: International Journal of Hydrogen Energy, 50, Part C (2024). - S. 492-500.
doi:10.1016/j.ijhydene.2023.08.258

Wolfgang Freudenberg, Felix Wich, Jalena Best, Elena Moukhina, Tim Scherzer, Holger Ruckdäschel, Nico Langhof, Stefan Schafföner: Thermo-oxidative crosslinking of carbon fiber reinforced PEEK (Polyetheretherketone) for additive manufactured ceramic matrix composites. In: Advanced Manufacturing : Polymer & Composites Science, 10 (2024). - .
doi:10.1080/20550340.2024.2387422

2023

Dimitri Seidenath, Alfons Weig, Andreas Mittereder, Thomas Hillenbrand, Dieter Brüggemann, Thorsten Opel, Nico Langhof, Marcel Riedl, Heike Feldhaar, Oliver Otti: Diesel exhaust particles alter gut microbiome and gene expression in the bumblebee Bombus terrestris. In: Ecology and Evolution, 13 (2023). - .
doi:10.1002/ece3.10180

Stefan Flauder, Felix Wich, Jianjun Sha, Nico Langhof, Walter Krenkel, Stefan Schafföner: Effect of thermo-mechanical and low-cycle preloading on the strength of carbon fiber-reinforced ceramic matrix composites. In: Journal of the European Ceramic Society, 43 (2023). - S. 5474-5483.
doi:10.1016/j.jeurceramsoc.2023.05.037

Stefan Flauder, Nico Langhof, Walter Krenkel, Stefan Schafföner: Frictional performance of C/C-SiC materials at high loads : The role of composition and third-body. In: Open Ceramics, 14 (2023). - .
doi:10.1016/j.oceram.2023.100364

Felix Wich, Stefan Flauder, Natalie Schneider, Michael Fleck, Nico Langhof, Walter Krenkel, Stefan Schafföner: Processing properties and pyrolysis behavior of novolak-hexamethylenetetramine mixtures. In: Advanced Manufacturing : Polymer & Composites Science, 9 (2023). - .
doi:10.1080/20550340.2023.2187687

2022

Thorsten Opel, Walter Krenkel, Nico Langhof, Stefan Schafföner: Design, Manufacturing and Testing of a Metcal-Ceramic Hybrid Brake Disc. - (Vortrag), Veranstaltung: 23. Symposium Verbundwerkstoffe und Werkstoffverbunde - Verbund 2022, 20.-22.07.2022, Leoben, Österreich.

Thorsten Opel, Nico Langhof, Walter Krenkel, Stefan Schafföner: Development and Tribological Studies of an Aluminium-CMC Hybrid Brake Disc. - (Vortrag), Veranstaltung: Ceramics in Europe 2022, 10.-14. July 2022, Krakau, Polen.

Thorsten Opel, Nico Langhof, Walter Krenkel, Stefan Schafföner: Tribological Properties of Low Wear Ceramic Matrix Composite Friction Pairings compared to Standard Friction Pairings. - (Vortrag), Veranstaltung: EuroBrake 2022, 17.-19.05.2022, online.

Anja Holzinger, Magdalena Mair, Darleen Lücker, Dimitri Seidenath, Thorsten Opel, Nico Langhof, Oliver Otti, Heike Feldhaar: Comparison of fitness effects in the earthworm Eisenia fetida after exposure to single or multiple anthropogenic pollutants. In: Science of the Total Environment, 838, Part 3 (2022). - .
doi:10.1016/j.scitotenv.2022.156387

Thorsten Opel, Nico Langhof, Walter Krenkel: Development and tribological studies of a novel metal‐ceramic hybrid brake disc. In: International Journal of Applied Ceramic Technology, 19 (2022). - S. 62-74.
doi:10.1111/ijac.13826

Wei Zhou, Matthias Meiser, Felix Wich, Tom Liensdorf, Wolfgang Freudenberg, Yang Li, Nico Langhof, Walter Krenkel: Fiber orientation dependence of tribological behavior of short carbon fiber reinforced ceramic matrix composites. In: Journal of the American Ceramic Society, 105 (2022). - S. 538-552.
doi:10.1111/jace.18075

Stefan Flauder, Ilaria Bombarda, Roberto D’Ambrosio, Nico Langhof, Andrea Lazzeri, Walter Krenkel, Stefan Schafföner: Size effect of carbon fiber-reinforced silicon carbide composites (C/C-SiC) : Part 2 - tensile testing with alignment device. In: Journal of the European Ceramic Society, 42 (2022). - S. 1227-1237.
doi:10.1016/j.jeurceramsoc.2021.11.044

Nico Langhof: Walter Krenkel – CMC-pioneer and dedicated expert on ceramics. In: International Journal of Applied Ceramic Technology, 19 (2022). - S. 5-6.
doi:10.1111/ijac.13954

Wolfgang Freudenberg, Felix Wich, Nico Langhof, Stefan Schafföner: Additive manufacturing of carbon fiber reinforced ceramic matrix composites based on fused filament fabrication. In: Journal of the European Ceramic Society, 42 (2022). - S. 1822-1828.
doi:10.1016/j.jeurceramsoc.2021.12.005

2021

Thorsten Opel, Nico Langhof, Walter Krenkel, Stefan Schafföner: Metal-CMC Hybrid Brake Disc for E-Mobility. - (Vortrag), Veranstaltung: Friction 2021: European Symposium on Friction, Wear and Wear Protection, 18. - 19.11.2021, Online.

Thorsten Opel, Nico Langhof, Walter Krenkel, Stefan Schafföner: Metal-Ceramic Hybrid Brake Disc : Concept, Prototype, Testing. - (Vortrag), Veranstaltung: EuroBrake 2021, 17.-21. Mai 2021, .

Thorsten Opel, Nico Langhof, Walter Krenkel, Stefan Schafföner: C/SiC Hybrid Brake Disc with Metal Support Body for E-Mobility. - (Vortrag), Veranstaltung: Keramik 2021 : 96. DKG-Jahrestagung, 19.-21. April 2021, .

Matthias Riegraf, Ilaria Bombarda, Ferdinand Dömling, Tom Liensdorf, Carolin Sitzmann, Nico Langhof, Stefan Schafföner, Feng Han, Noriko Sata, Christian Geipel, Christian Walter, Rémi Costa: Enhancing the Mechanical Strength of Electrolyte-Supported Solid Oxide Cells with Thin and Dense Doped-Ceria Interlayers. In: ACS Applied Materials & Interfaces, 13 (2021). - S. 49879-49889.
doi:10.1021/acsami.1c13899

Dimitri Seidenath, Anja Holzinger, Klara Kemnitz, Nico Langhof, Darleen Lücker, Thorsten Opel, Oliver Otti, Heike Feldhaar: Individual vs. Combined Short-Term Effects of Soil Pollutants on Colony Founding in a Common Ant Species. In: Frontiers in Insect Science, 1 (2021). - .
doi:10.3389/finsc.2021.761881

Feng Han, Matthias Riegraf, Noriko Sata, Ilaria Bombarda, Tom Liensdorf, Carolin Sitzmann, Nico Langhof, Stefan Schafföner, Christian Walter, Christian Geipel, Rémi Costa: Properties and Performance of Electrolyte Supported SOFCs with EB-PVD Gd-Doped Ceria Thin-Films. In: ECS Transactions, 103 (2021). - S. 139-147.
doi:10.1149/10301.0139ecst

Stefan Flauder, Nico Langhof, Walter Krenkel, Stefan Schafföner: Size effect of carbon fiber-reinforced silicon carbide composites (C/C-SiC) : Part 1 – bending load and statistical effects. In: Journal of the European Ceramic Society, 41 (2021). - S. 6805-6814.
doi:10.1016/j.jeurceramsoc.2021.07.040

L. Klemenz, A. Richter, Nico Langhof, M. Göbbels: Structure and principles of oxidic hexaphases : A review. In: Open Ceramics, 7 (2021). - .
doi:10.1016/j.oceram.2021.100142

Stefan Flauder, Nico Langhof, Walter Krenkel: Tailored macro-pores during the formation of C/C-SiC via liquid phase pyrolysis. In: Journal of the European Ceramic Society, 41 (2021). - S. 2995-3001.
doi:10.1016/j.jeurceramsoc.2020.10.006

2020

Thorsten Opel, Stefan Zelder, Felix Wich, Nico Langhof, Walter Krenkel: Untersuchung und Bewertung unterschiedlicher Fügeverfahren keramischer Verbundwerkstoffe mit metallischen Tragkörpern. - (Vortrag), Veranstaltung: Mitgliederversammlung Ceramic Composites 2020, 06.10.2020, .

Carolin Sitzmann, Tom Liensdorf, Ferdinand Dömling, Nico Langhof, Walter Krenkel: Mechanische Charakterisierung von Festoxid-Brennstoffzellen. In: Keramische Zeitschrift, 72 (2020). - S. 48-53.
doi:10.1007/s42410-020-0122-3

Walter Krenkel, Thorsten Opel, Nico Langhof: Novel Ceramic/Metal Brake Discs. - (Vortrag), Veranstaltung: 44th International Conference Advanced Ceramics and Composites ICACC 2020, 26-31.1.2020, Daytona Beach, Florida, USA.

Tom Liensdorf, Rebecca Schoch, Marieluise Lang, Nico Langhof, Thomas Hochrein, Martin Bastian, Walter Krenkel: Silicon infiltrated silicon carbide from extruded thermoplastic wood polymer composites. In: International Journal of Applied Ceramic Technology, 17 (2020). - S. 3-10.
doi:10.1111/ijac.13404

2019

Thorsten Balzer, Nico Langhof, Walter Krenkel: Lightweight Metal-Ceramic Hybrid Brake Disc for Electric-Powered Vehicles : Concept and Prototype. - (Vortrag), Veranstaltung: 10th International Conference on High Temperature Ceramic Matrix Composites, 22.-26. Sept. 2019, Bordeaux.

Thorsten Balzer, Nico Langhof, Walter Krenkel: Lightweight Metal-Ceramic Hybrid Brake Disc for Electric-Powered Vehicles : Concept and Prototype. - (Vortrag), Veranstaltung: 22. Symposium Verbundwerkstoffe und Werkstoffverbunde, 26.-28. Juni 2019, Kaiserslautern.

Thorsten Balzer, Nico Langhof, Felix Wich, Walter Krenkel: Lightweight Metal-Ceramic Hybrid Brake Disc for Electric-Powered Vehicles. - (Poster), Veranstaltung: EuroBrake 2019, 21.-23. Mai 2019, Dresden.

Thorsten Balzer, Nico Langhof, Walter Krenkel, Reinhard Hackenschmidt, Frank Rieg: Lightweight Metal-Ceramic Hybrid Brake Disc for Electric-Powered Vehicles : Concept and Prototype. - (Vortrag), Veranstaltung: EuroBrake 2019, 21.-23. Mai 2019, Dresden.

Renato S. M. Almeida, Li Yang, Benjamin Besser, Peng Xiao, Wei Zhou, Alexander Brückner, Nico Langhof, Kamen Tushtev, Walter Krenkel, Kurosch Rezwan: Damage analysis of 2.5D C/C-SiC composites subjected to fatigue loadings. In: Journal of the European Ceramic Society, 39 (2019). - S. 2244-2250.
doi:10.1016/j.jeurceramsoc.2019.01.014

Tom Liensdorf, Nico Langhof, Walter Krenkel: Mechanical properties of PEEK-Derived C/SiC Composites with Different Fiber Lengths. In: Advanced Engineering Materials, 21 (2019). - .
doi:10.1002/adem.201800835

Carolin Spatz, Georg Puchas, Nico Langhof, Walter Krenkel: Neuartige Preformen aus hochsteifen technischen Fasern für Verbundkeramiken. In: Werkstoffe in der Fertigung, (2019). - S. 20-23.

Nadja Wolff, Nico Langhof, Walter Krenkel: Oxidation Behavior of Alumina Fiber Reinforced SiCO Composites for a Co-Firing Process on Steel Pipes. In: Advanced Engineering Materials, 21 (2019). - .
doi:10.1002/adem.201900233

2018

Stefan Flauder, Nico Langhof, Walter Krenkel: Frictional behavior and properties of fabric reinforced C/SiC brake pads on a steel brake disk. - (Vortrag), Veranstaltung: 14th International Ceramics Congress CIMTEC 2018, 04.-08.06.2018, Perugia, Italien.

Thorsten Balzer, Nico Langhof, Walter Krenkel: A Novel Approach for Small and Light Weight Hybrid Brake Discs for Electric-Powered Vehicles. - (Vortrag), Veranstaltung: EuroBrake 2018, 22.-24. Mai 2018, Den Haag.

Felix Wich, Thorsten Balzer, Nico Langhof, Walter Krenkel: A Novel Approach for Small and Light Weight Hybrid Brake Discs for Electric-Powered Vehicles. - (Poster), Veranstaltung: EuroBrake 2018, 22.-24. Mai 2018, Den Haag.

Carolin Spatz, Nico Langhof, Jens Schmidt, Walter Krenkel: CMC jackets for metallic pipes : a novel approach to prevent the creep deformation of thermo-mechanically loaded metals. In: Journal of the European Ceramic Society, 38 (2018). - S. 2954-2960.
doi:10.1016/j.jeurceramsoc.2018.01.018

Xiaojun Wu, Nico Langhof, Walter Krenkel, Rebecca Habath, Franziska Lenz: Effect of pyrolysis temperature on the microstructure and capillary infiltration behavior of carbon/carbon composites. In: Ceramics International, 44 (2018). - S. 16325-16332.
doi:10.1016/j.ceramint.2018.06.034

Walter Krenkel, Nico Langhof: New Approaches for the Manufacture of C/C-SiC Composite Materials. - (Vortrag), Veranstaltung: CIMTEC 2018, 4.6.-8.6.2018, Perugia, Italy.

2017

Stefan Flauder, Reinhard Hackenschmidt, Frank Rieg, Nico Langhof, Walter Krenkel: The properties and behavior of carbon fiber reinforced silicon carbide composite brake pads on a steel brake disk during a dynamometer test for frictional applications. - (Vortrag), Veranstaltung: 21. Symposium Verbundwerkstoffe und Werkstoffverbunde, 05.-07.07.2017, Bremen.

Jixiang Dai, Jianjun Sha, Junqi Shao, Yufei Zu, Mingkai Lei, Stefan Flauder, Nico Langhof, Walter Krenkel: In-situ growth of SiC nanostructures and their influence on anti-oxidation capability of C/SiC composites. In: Corrosion Science, 124 (2017). - S. 71-79.
doi:10.1016/j.corsci.2017.05.008

Florian Reichert, Ana Pérez-Mas, Daniel Barreda, Clara Blanco, Ricardo Santamaria, Christian Kuttner, Andreas Fery, Nico Langhof, Walter Krenkel: Influence of the carbonization temperature on the mechanical properties of thermoplastic polymer derived C/C-SiC composites. In: Journal of the European Ceramic Society, 37 (2017). - S. 523-529.
doi:10.1016/j.jeurceramsoc.2016.09.005

Jixiang Dai, Jianjun Sha, Yufei Zu, Junqi Shao, Mingkai Lei, Stefan Flauder, Nico Langhof, Walter Krenkel: Synthesis and growth mechanism of SiC nanofibres on carbon fabrics. In: CrystEngComm, 19 (2017). - S. 1279-1285.
doi:10.1039/C6CE02602H

2016

Walter Krenkel, Nico Langhof: Ceramic Matrix Composites for High Performance Friction Applications. In: Bill Lee, Rainer Gadow, Vojislav Mitic (Hrsg.): Proceedings of the IV Advanced Ceramics and Applications Conference. - Amsterdam : Atlantis Press, 2016.

Yuki Kubota, Kohei Fukuda, Hiroshi Hatta, Nico Langhof, Walter Krenkel, Yasuo Kogo: Crack development and deformation mechanisms of carbon-fiber-reinforced plastics at elevated temperatures. In: Engineering Fracture Mechanics, 153 (2016). - S. 244-258.
doi:10.1016/j.engfracmech.2015.12.004

Yang Li, Peng Xiao, Heng Luo, Renato S. M. Almeida, Zhuan Li, Wei Zhou, Alexander Brückner, Florian Reichert, Nico Langhof, Walter Krenkel: Fatigue behavior and residual strength evolution of 2.5D C/C-SiC composites. In: Journal of the European Ceramic Society, 36 (2016). - S. 3977-3985.
doi:10.1016/j.jeurceramsoc.2016.07.009

Nico Langhof, M. Rabenstein, Jens Rosenlöcher, Reinhard Hackenschmidt, Walter Krenkel, Frank Rieg: Full-ceramic brake systems for high performance friction applications. In: Journal of the European Ceramic Society, 36 (2016). - S. 3823-3832.
doi:10.1016/j.jeurceramsoc.2016.04.040

Nico Langhof, Walter Krenkel: Science Friction : Fabrication, evaluation and design of high performance C-fiber reinforced ceramic friction materials. In: Carbon Composites Magazin, (2016). - .

Yang Li, Peng Xiao, Zhuan Li, Wei Zhou, Tom Liensdorf, Wolfgang Freudenberg, Florian Reichert, Nico Langhof, Walter Krenkel: Strength evolution of cyclic loaded LSI-based C/C-SiC composites. In: Ceramics International, 42 (2016). - S. 14505-14510.
doi:10.1016/j.ceramint.2016.06.061

Yang Li, Peng Xiao, Zhuan Li, Wei Zhou, Tom Liensdorf, Wolfgang Freudenberg, Nico Langhof, Walter Krenkel: Tensile fatigue behavior of plain-weave reinforced Cf/C-SiC composites. In: Ceramics International, 42 (2016). - S. 6850-6857.
doi:10.1016/j.ceramint.2016.01.068

Walter Krenkel, Nico Langhof, Florian Reichert: Thermoplastic Carbon Precursors for Ceramic Matrix Composites. - (Vortrag), Veranstaltung: 9th International Conference on High Temperature Ceramic Matrix Composites (HTCMC 9), June 26-July 1, 2016, Toronto, Ontario, Canada.

2015

Florian Reichert, Nico Langhof, Walter Krenkel: The Evaluation of Thermoplastic Precursors for C/C-SiC Manufactured by Liquid Silicon Infiltration (LSI). In: Materials Science Forum, 825-826 (2015). - S. 232-239.
doi:10.4028/www.scientific.net/MSF.825-826.232

Walter Krenkel, Nico Langhof: Faserverbundkeramiken für Friktionsanwendungen. In: Kriegesmann, Jochen (Hrsg.): Technische Keramische Werkstoffe. Band 7. Kapitel 8.3.1.1. - Köln : Dt. Wirtschaftsdienst, 2015. - S. 1-38.

Florian Reichert, Nico Langhof, Walter Krenkel: Influence of Thermal Fiber Pretreatment on Microstructure and Mechanical Properties of C/C-SiC with Thermoplastic Polymer-Derived Matrices. In: Advanced Engineering Materials, 17 (2015). - S. 1119-1126.
doi:10.1002/adem.201500193

Herbert Seeger, Bernhard Langenbeck, Nico Langhof, Walter Krenkel: Schwerlastbremse
EP 15 18 14 41.5, (2015)

2014

Nico Langhof, Walter Krenkel: Innovative keramische Werkstoffe und Komponenten für stationäre Gasturbinen. - (Vortrag), Veranstaltung: 4. VDI-Fachkonferenz "Werkstoffe in der Kraftwerkstechnik", 04.-05. Juni 2014, Raunheim bei Frankfurt a.M., Deutschland.

Nico Langhof, Walter Krenkel: Druckrohre für Kraftwerke der Zukunft : Faserverstärkte Armierungen steigern die Effizienz von Dampfkraftwerken. In: Spektrum, 10 (2014). - S. 81.

Herbert Seeger, Bernhard Langenbeck, Jörg Sorhage, Walter Krenkel, Nico Langhof: Verfahren zur Herstellung einer Lamelle für eine Bremse beziehungsweise Kupplung sowie Lamelle
EP 14 18 2716.2, (2014-08-28)

2013

Yuuki Kubota, Kohei Fukuda, Hiroshi Hatta, Walter Krenkel, Nico Langhof: Defect and deformation mechanisms of carbon fiber reinforced phenolic ablators. - (Paper), Veranstaltung: 29th International Symposium on Space Technology and Science (ISTS 2013), 02.-09.06.2013, Nagoya-Aichi, Japan.

Nico Langhof, M. Rabenstein, Daniel A. Kunz, R. Hegermann, P. Goetz, R. Yarim, Jens Rosenlöcher, Rebecca Habath, Walter Krenkel: The Performance of C-Fiber Reinforced Ceramic Friction Pads (CMCs). In: Abendroth, Harald (Hrsg.): Proceedings of EuroBrake. - London : FISITA, 2013.

2012

Nico Langhof, Bettina Alber-Laukant, C. Greuel, M. Hilpert, A. Kozub, R. Voigt, Walter Krenkel: Fiber Reinforced Ceramic Friction Pads for Automotive Applications : The Dependence of Friction and Wear on Speed and Braking Pressure. In: EuroBrake 2012 Conference Proceedings. - London : FISITA, 2012.

Nico Langhof, Carolin Spatz, Martin Günthner, R. Voigt, Günter Motz, Walter Krenkel: Steigerung der Effizienz durch neuartige keramische Beschichtungen und keramische faserverstärkte Armierungen für Heißdampfrohre. In: Karl Maile (Hrsg.): 2. VDI Fachkonferenz Werkstoffe in der Kraftwerkstechnik. - Düsseldorf : VDI Wissensforum, 2012.

2011

Nico Langhof, Carolin Spatz, Martin Günthner, R. Voigt, Günter Motz, Walter Krenkel: Steigerung der Effizienz durch hochtemperaturbeständige keramische Beschichtungen und Verbundwerkstoffe. In: Maile, Karl (Hrsg.): VDI-Fachkonferenz Werkstoffe in der Kraftwerkstechnik. - Düsseldorf : VDI Wissensforum, 2011. - S. 121-138.

2010

Walter Krenkel, H. Mucha, Nico Langhof: Ceramic Matrix Composites for Friction Applications. - (Vortrag), Veranstaltung: 12th International Ceramics Congress (CIMTEC 2010), 06.-11.06.2010, Montecatini Terme, Italy.

Nico Langhof, H. Mucha, Walter Krenkel: The Effect of Additives on CMC-Friction Pads at Elevated Temperatures. In: Krenkel, Walter ; Lamon, J. (Hrsg.): High Temperature Ceramic Materials and Composites. - Berlin : AVISO Verl.-Ges., 2010. - S. 553-558.

Nico Langhof, R. Voigt, H. Mucha, Walter Krenkel: The Effect of Residual Silicon in CMC Brake Pads on Friction and Wear. In: Proceedings of the 6th European Conference on Braking. - Lille : 2010. - S. 71-78.

Faculty of Engineering Science
Chair of Ceramic Materials Engineering

Dr. rer. nat. Nico Langhof
Head of work group "Ceramic Matrix Composites"

95447 Bayreuth
Germany

Phone: +49 921/55 - 6505
E-mail: nico.langhof@uni-bayreuth.de