T. Graf, R. Fonk, S. Paessler, C. Bauer, J. Kallo, C. Willich, "Low pressure influence on a direct fuel cell battery hybrid system for aviation" International Journal of Hydrogen Energy, 2023, https://doi.org/10.1016/j.ijhydene.2023.09.003

P. Hoenicke, R. Khatri, C. Bauer, M. Osama, J. Kallo, C. Willich, "Influence of Low Pressures on the Performance of Lithium Ion Batteries for Airplane Applications", Journal of The Electrochemical Society, 2023, https://doi.org/10.1149/1945-7111/acdd1e

D. Frank, J. Schröter, C. Bauer, C. Willich, "Development of a control strategy for an air supply module for pressurizing fuel cells in airborne applications", International Journal of Hydrogen Energy, 2023, https://doi.org/10.1016/j.ijhydene.2023.05.204.

M. Staudacher, J. Kallo, C. Willich, C. Bauer, "Optimizing the control strategy of redundant motor-inverter systems for aircraft propulsion application", International Conference on Mechanical, Aerospace and Electronic Systems, Johannesburg, South Afric, November 2023  (best paper award)

C. Willich, T. Graf, R. Fonk, P. Hoenicke, C. Bauer, "A Direct Hybrid with Power Management for Aviation Applications", International Conference nRenewable Energy 2023, Paris, France, October 2023

D. Frank, C. Bauer, C Willich, "Modeling of the cathode air supply for a pressurized
hydrogen fuel cell system in airborne applications", Aerospace Europe Conference 2023, July 2023

R. Fonk, T. Graf, S. Paessler, C. Bauer and C. Willich. "Control logic for a direct hybrid-electric powertrain on a integrated modular avionics device," AIAA 2023-4535. AIAA AVIATION 2023 Forum. June 2023, https://doi.org/10.2514/6.2023-4535

T. Graf, R. Fonk, C. Bauer and C. Willich. "Dimensioning of a direct fuel cell battery hybrid system for an all-electric aircraft," AIAA 2023-4536. AIAA AVIATION 2023 Forum, June 2023, https://doi.org/10.2514/6.2023-4536

C. Willich, M. Schlick, C. Königsberger, P. Prickler, M. Aydin, O. Heilmann, “Assessing the future hydrogen demand in the mobility sector for the Ulm region in southern Germany”, EVS36 - Electric Vehicle Symposium & Exposition (EVS36), Sacramento, California, USA, June 2023. https://doi.org/10.5281/zenodo.8322646

C. Willich, M. Staudacher, F. Türk, C. Bauer, "Integrated temperature sensor for non-invasive temperature measurement". Open Access Repositorium der Universität Ulm und Technischen Hochschule Ulm, 2023, https://oparu.uni-ulm.de/xmlui/handle/123456789/51137

T. Graf, R. Fonk, J. Schröter, P. Hoenicke, C. Bauer, J. Kallo, C. Willich, "Investigation of a fuel cell hybrid system with a new modular test bench approach for all electric hybrid power train systems", Journal of Energy Storage, Volume 56, Part B, 2022, https://doi.org/10.1016/j.est.2022.105999

D. Frank, G. Neubauer, C. Bauer, J. Kallo, and C. Willich, “Exhaust Emission Measurements from a Spark-Ignition Engine Using Fuels with Different Ethanol Content for Aircraft Applications,” ACS Omega, Aug. 2022, doi: 10.1021/acsomega.2c02907

S. Bhattacharya, D. Anagnostou, P. Schwane, C. Bauer, J. Kallo, C. Willich, "A Flexible DC–DC Converter with Multi-Directional Power Flow Capabilities for Power Management and Delivery Module in a Hybrid Electric Aircraft", Energies 2022, 15, 5495. https://doi.org/10.3390/en15155495

S. Bhattacharya, C. Willich, J. Kallo, "Design and Demonstration of a 540 V/28 V SiC-Based Resonant DC–DC Converter for Auxiliary Power Supply in More Electric Aircraft", Electronics 11, no. 9: 1382, 2022 https://doi.org/10.3390/electronics11091382

J. Schröter, D. Frank, V. Radke, C. Bauer, J. Kallo, C. Willich, "Influence of Low Inlet Pressure and Temperature on the Compressor Map Limits of Electrical Turbo Chargers for Airborne Fuel Cell Applications", Energies 15, no. 8: 2896, 2022, https://doi.org/10.3390/en15082896

M. Hamid, B. Li, J. Xie, "Decommissioned batteries and their usage in multilevel inverters as an addition to the circular economy". Energy Storage. 2022;e327. doi:10.1002/est2.327

P. Hoenicke, R. Khatri, C. Willich, C. Bauer, M. Osama, “Influence of Aviation Conditions on Lithium-Ion Batteries”, 242nd ECS Meeting, October 9-13, 2022

D. Frank, J. Schröter, C. Bauer, C. Willich, “Air Supply Module for Pressurizing Fuel Cells in Airborne Applications”, 23rd World Hydrogen Energy Conference, 26-30 Juni 2022, Istanbul, Türkiye

S. Bhattacharya, L.-A. Grégoire, J. Kallo, M. Stevic, M. Garg, C. Willich, “FPGA-based Real-Time Simulation for LLC Resonant Converter Prototyping”, 2022 IEEE 13th International Symposium on Power Electronics for Distributed Generation Systems, 26-29 June 2022, Kiel, Germany

D. Gosh, C. Willich, J. Kallo, “Demonstration of a Novel Alternating Current Hybrid Concept for a Fuel Cell–Battery Hybrid Electric Aircraft”, Energies 2021, 14, 7350, 2021, https://doi.org/10.3390/en14217350 

P. Hoenicke, D. Gosh, A. Muhandes, S. Bhattacharya, C. Bauer, J. Kallo, C. Willich, “Power Management Control and Delivery Module for a Hybrid-electric Aircraft using Fuel Cell and Battery”, Energy Conversion and Management, Volume 244, 2021, https://doi.org/10.1016/j.enconman.2021.114445

J. Schröter, T. Graf, D. Frank, C. Bauer, J. Kallo, C. Willich, “Influence of pressure losses on compressor performance in a pressurized fuel cell air supply system for airplane applications”, International Journal of Hydrogen Energy, Volume 46, Issue 40, Pages 21151-21159, 2021, https://doi.org/10.1016/j.ijhydene.2021.03.218

J. Schröter, D. Steinbarth, Ch. Bauer, U. Reichmann, J. Kallo, C. Willich, “Climate and pressure chamber for simulation of flight conditions” Open Access Repositorium der Universität Ulm, http://dx.doi.org/10.18725/OPARU-38012

S. Bhattacharya, C. Willich, P. Hoenicke, J. Kallo, “A Novel Re-configurable LLC Converter for Electric Aircraft”, IEEE 2021 - Energy Conversion Congress & Exposition – Asia, online, 2021

D. Frank, G. Neubauer, C. Bauer, C. Willich, J. Kallo, “Exhaust Emission Measurement and Analysis of a Rotax 915 Aircraft Piston Engine with Conventional and Alternative Fuels”, Aerospace Europe Conference, 2021, Warsaw, Poland

P. Hoenicke, C. Willich, C. Bauer, M. Osama, and J. Kallo, “Simulation Model of Lithium Ion Battery Cells for Electrical Aircraft Applications Considering Electrical and Thermal Behavior”, 240th ECS Meeting 2021, online

G. Neubauer, D. Frank, C. Bauer, J. Kallo, C. Willich, “Exhaust Emission Measurements Applicable to the Hybrid Panthera”, 11th EASN Virtual Conference on “Innovation in Aviation & Space to the Satisfaction of the European Citizens”, 2021, online

P. Hoenicke, A. Muhandes, M. Staudacher, D. Ghosh, S. Bhattacharya, T. Graf, F. Tuerk, Ch. Bauer, J. Kallo, C Willich, “Development, Testing and Integration of a new Power Management Control and Delivery Module for a Hybrid Electric Aircraft”, 11th EASN Virtual Conference on “Innovation in Aviation & Space to the Satisfaction of the European Citizens”, 2021, online

 J. Schröter, V. Radke, D. Frank, C. Bauer, J. Kallo, C. Willich, “Influence of ambient pressure and temperature on compressor performance in a pressurized fuel cell air supply system for airplane applications”, 2nd International Hydrogen Aviation Conference IHAC, 2021 online

P. Thierer,  C. Willich, “Energiespeicherbedarf für die Integration von Erneuerbaren Energien ins Stromnetz,” in 16. Symposium Energieinnovation, Graz, Austria, 2020

D. Anagnostou, A. Muhandes, C. Willich, J. Kallo, “Challenges of DC insulating systems for airplanes”, COMSOL conference, 14-15-10.2020, online

D. Gosh, J. Kallo, C. Willich, "High Efficient Energy System for Electric Passenger Aircraft Propulsion", AIAA Scitech 2019 Forum, San Diego, California, USA, 2019

Ghosh D. et. al. (invited lecture 2019): A novel AC hybrid for hydrogen fuel cell propulsion system; More Electric Aircraft Europe, 28.-31.10.2019, Hamburg, Germany (2019)

D. Ghosh, C. Willich, J. Kallo, "Development of a novel AC hybrid concept for a fuel cell-battery hybrid electric aircraft with power electronics switches," 2018 14th International Conference on Power Electronics (CIEP), pp. 105-110, Cholula, Mexico, 2018