Research Stays Abroad

  Visiting period:

04.11.2019 – 29.11.2019

Visiting institution:

 KU Leuven, Belgium

 

Visiting scientists:

Prof. Sabine van Huffel

 

For my external research stay I visited the group of Professor Sabine van Huffel at the KU Leuven in Belgium. Her group is part of the STADIUS Center for dynamical systems, signal processing and data analytics. 

For four weeks I have been working on artifact removal for EEG signals. Previous research of the group focused mainly on multi-channel artifact removal, but I mainly dealt with behind-the-ear EEG consisting of only 4 electrodes. 

Altogether, I worked with a lot of different algorithms that can be used for single-channel measurements, especially variations of the EMD (Empirical Mode Decomposition) and Wavelet Transformation. I learned a lot about the advantages and disadvantages of the algorithms and the assumptions that have to be fulfilled for their usage. The aim is to apply the algorithms (single channel as well as multi-channel) to the ME sensor systems in a second step and thus to enhance the output signals in a non-stationary and non-linear fashion. 

At the last two days of my research stay I attended the annual IEEE EMBS Benelux chapter symposium, taking place in Leuven (Thursday) and in Brussels (Friday). The topic of the symposium was Artificial Intelligence in Healthcare.

I would like to thank Prof. van Huffel for the opportunity to visit her working group and for the insights into single- and multi-channel blind source separation techniques. Additionally, I would like to thank the German Research Foundation (DFG) for funding this research stay as part of the CRC 1261.

 

  Visiting period:

2019

Visiting institution:

DTU in Denmark, Lyngby near Copenhagen

Visiting scientists:

Prof. Hansen

 

For my research stay abroad, I stayed at the DTU in Denmark, Lyngby near Copenhagen. 

I was staying in the Department of Applied Mathematics and Computer Science in the Section for Scientific Computing under the supervision of Prof. Hansen.

I was dealing with the inverse computation for possible imaging systems for the project B7. I was provided with an easy to use toolbox for efficient computation of the inverse solution under given constraints. With this toolbox, the inversion of large datasets was possible in a short amount of time, which enabled the comparison between different imaging system geometries. I derived possible geometries for an imaging system that could potentially work for 3D imaging for the B7 project.  

During my research stay, I enjoyed the working surroundings and all the colleagues. From time to time we had board game sessions after work and played until past 10 pm. The food in the cafeteria was great and the summer in Denmark was very warm and I enjoyed the nice weather during the time of my stay.

Each week there was a talk from the members of the group, explaining their work. It was very interesting to hear about other imaging procedures and the approaches with which the models were investigated.

My research stay formed the basis for further research and widened my understanding of other fields that deal with imaging and inverse problems.

 

  Visiting period:

mid-November to mid-December 2017

Visiting institution:

Institute of Mechanics and Mechatronics of the Vienna University of Technology, Austria

Visiting scientists:

Prof. Kaltenbacher

 

From mid-November to mid-December 2017, I spent my research stay abroad in Vienna, Austria, where I had the opportunity to work at the Institute of Mechanics and Mechatronics of the Vienna University of Technology in the group of Prof. Kaltenbacher focusing on technical acoustics [1]. The group has a lot of experience in modelling and optimization of MEMS speakers, acoustic insulation, e.g. in the automotive area, and multi-physic systems such as surface acoustic wave (SAW) sensors. They are well experienced in developing FEM models due to their development of their own Finite Element simulation tool CFS++ (Coupled Field Simulation).

The exchange was very helpful to validate my complex SAW model with anisotropic material properties. The group provided access to their FEM tool and supported me in transferring my existing COMSOL SAW model to CFS++, so that I was able to confirm my COMSOL model.

One of the main objectives was to verify the rotated anisotropic st-cut quartz material model. Different simulation tools are using various coordinate system definitions and the definition of the rotation angle of the crystal itself is inconsistent in the literature. Hence, it was very helpful to implement the tensor rotation in both FEM tools in order to approve the used orientation and tensor rotation implementation.

A particular challenge was to implement perfectly matched layers (PML). These layers are necessary to prevent undesired reflections of the propagating mechanical waves at the model boundaries. During my stay, we expanded the PML implementation in their CFS++ to mechanical waves and my work resulted in a test case for that implementation.
Besides research, I was able to find some time for sightseeing in Vienna, i.e. for famous Schönbrunn Palace, Belvedere Palace, Hofburg etc. In addition, I was included into group activities, i.e. visiting Christmas markets.

I would like to thank Prof. Kaltenbacher for the opportunity to visit his work group and learn from their experience and Dr. Toth for his excellent support. I also would like to thank the German Research Foundation (DFG) for funding this research stay as part of the CRC 1261. 

 

  Visiting period:

11.04.2018-29.06.2018

Visiting institution:

University of South Australia, Adelaide, Australia

Visiting scientists:

Benjamin Thierry

 

From mid of April to end of June, I did my external research stay in Adelaide. Here I visited the NanoBioEngineering group of Benjamin Thierry at the Future Industries Institute at the University of South Australia in Adelaide. The group is interdisciplinary and focusses on the development and implementation of novel cancer biodiagnostic and prognostic technologies. There is a lot of work going on dealing with nanoparticles and microfluidic devices. In both areas I learned useful things for my work in the CRC 1261. 

I really enjoyed my stay in this group of nice people from all over the world. Everybody was extremely helpful and open-minded. Besides this, I really liked the meetings with Benjamin, which were very inspiring. Sometimes I missed having lunch together with the group but this was compensated with several after work activities with the whole group and single group members. 

During my last week in Australia I visited the Nanomedicine Conference in Sydney. A nice experience with many interesting talks about nanoparticles in biological applications and biosensors.

In Adelaide I lived most of the time in a very nice AirBnB Apartment. My hosts were from Vietnam and I had the possibility to taste many new flavours and spices. In the first month the weather was very nice. On my first weekend in Australia my hosts took me to the beach where we collected a lot of clams. Towards the end of my stay the weather was getting colder every day like it is usual in autumn downunder. This was the time were all the fruits in the beautiful garden were ripe and it was possible to have a glass of self-made orange juice in the morning. The only drawback was that the orange juice was nearly frozen since it was close to one degree. Briefly I would recommend everybody to go to Australia but If you will ever travel to South Australia during the summer in Europe pack your warm stuff since it is freezing cold – even inside the houses.

I would like to thank the DFG for funding this research stay through CRC 1261.

 

  Visiting period:

20.08.2018 – 28.09.2018 (6 weeks)

Visiting institution:

FEMTO-ST Institute, Besançon, France

Visiting scientists:

Enrico Rubiola, Jean-Michel Friedt

 

For my research stay abroad I visited the Institute FEMTO-ST in Besançon, France, which is a joint CNRS-University Bourgogne Franche-Comté research institute that carries out both fundamental and applied research in many fields of physics including optics, acoustics, robotics, automatics, time-frequency metrology, mechanics, and energy storage. For 6 weeks I have been working with the Time & Frequency Department under the supervision of Enrico Rubiola and Jean-Michel Friedt. They are outstanding experts in the fields of phase noise, surface acoustic wave (SAW) sensors, oscillators, and low noise instrumentation. Together with them I was able to further improve the noise floor of the readout electronics for our SAW magnetic field sensors as well as to develop an analytical noise model for the various types of readout systems. More particularly, a theory has been developed and verified by various measurements which allows to derive the ultimate limit of detection in both open-loop and closed-loop SAW sensor systems. So far, two journal papers have been written based on the work during the research stay. Because several further ideas emerged, this fruitful collaboration is still ongoing. I would like to take this opportunity to gratefully thank my hosts once again for their excellent support both during my stay and also afterwards. In addition, I also want to thank the German Research Foundation (DFG) for funding this research stay as part of the CRC 1261.

 

  Visiting period: 15.01.2018 - 15.02.2018 (1 months)
Visiting institution:

Institute Neél - CNRS

Hosting scientist:

Stefania Pizzini

 

For my research stay I decided to visit the Institute Neél – CNRS, more specifically the group of Micro & Nano Magnetism (MNM) headed by Stefania Pizzini. With 450 employees, the institute Néel is one of the leading institutions for research in condensed matter physics. The institute also makes a high amount of contribution into magnetism and spintronics, which is also the main research topic of the MNM group. 

Upon arrival, the group quickly integrated me into their working environment and helped me to understand, guide and teach their vastly researched topic, which is domain wall dynamics. During my stay, I learned about the dynamics of domain walls and domain wall motion manipulated by current pulses through spin transfer torque (STT). Additionally, I had the chance to collaborate with researchers from Spintec and gained much insight into spin related phenomena (many thanks to Laurent and Toshiki). The whole visit provided me with much needed knowledge and expertise that I will need for my PhD as for my future career path. The newly gained experience and insights will be a benefit for the future work within the project SFB 1261 in the analysis of domain wall behavior in the magnetostrictive layers of the sensors. Furthermore, with the work and obtained results during my stay in Grenoble a joint work publication is expected. With this, I would like to thank everyone that I had the pleasure meeting and working with, especially Jan and Stefania.

The city of Grenoble by itself is a really interesting place. Secluded   between mountains and wrapped in the spirit of the Alps the city provides beautiful sceneries and various possibilities of activities in nature. The city by itself with its somewhat historical look gives the person living there a feeling of calmness, however during the day trams full of people running every some minutes shows the hustle and bustle of the dynamical life there. Grenoble is a relatively large city providing many versatile infrastructure as also multiple shopping possibilities around the city center as well as on the outskirts of it. People there are friendly and eager to help, if a visiting person looks like a lost tourist. The city has its fair share of international character however, I would recommend knowing at least some French words before visiting Grenoble.

In conclusion, the research stay was a success and provided a very positive outcome for me on a personal and professional level. For the other participants of the SFB 1261 I would definitely recommend Institute Neél and Grenoble as a wonderful possibility for an external research stay.

I gratefully thank the DFG as part of the CRC 1261 for giving me the opportunity through their funding to conduct this external research stay.

Matic Klug

Contact

sfb1261@tf.uni-kiel.de

Chairman:

Prof. Dr. Eckhard Quandt

Kiel University
Institute for Materials Science

 

Internal server

 

CAU

Christian-Albrechts-Universität zu Kiel (CAU)

Christ.-Albrechts-Platz 4
D-24118 Kiel

UKSH

University Hospital Schleswig-Holstein, Campus Kiel (UKSH)

Arnold-Heller-Straße 3
D-24105 Kiel

ISIT

Fraunhofer Institute for Silicon Technology, Itzehoe (ISIT)

Fraunhoferstrasse 1
D-25524 Itzehoe  

IPN

IPN - Leibniz-Institut für die Pädagogik der Naturwissenschaften und Mathematik an der Universität Kiel

Olshausenstraße 62 
D-24118 Kiel

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