Talks for the CRC Members in 2021

by Robert Bergholz

Allgemeine, Viszeral-, Thorax-, Transplantations- u. Kinderchirurgie, UKSH Kiel
 

Invitation

To whom it may concern,

my name is Robert Bergholz and I am a pediatric surgeon at the UKSH Kiel.
I am interested in surgical research, especially things, instruments, techniques and devices that bring surgery forward and I want to implement new ideas rather than working on things that have been done before.
In my eyes - collaborating with you might end up in surgical devices that are being trackable and even can be steered by hand movements – things that are still missing in modern minimally invasive surgery and being on of the last frontiers in modern surgery.
I hope to meet as many of you in person to share with you my ideas, even if they are way out of being accessible.

Many greetings,
Robert Bergholz


Please note: The colloquium takes place - diverging from our regular colloquium schedule - on Wednesday, December 8th, at 5 pm.

 

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by Agnė Žukauskaitė

Fraunhofer Institute for Applied Solid State Physics, Freiburg
 

Abstract

Surface acoustic wave (SAW) technology offers a variety of applications from RF filters for mobile communication to biosensing. New fields, such as quantum acoustics are emerging as well. The key component in a SAW device is, of course, the medium through which the acoustic wave will travel. The mechanical, piezoelectric, and structural properties of the chosen material will affect the frequency, bandwidth, and quality factor of a SAW device. The wave is confined close to the surface, so due to lower production costs and easier manufacturing, thin piezoelectric films are widely used here. The emergence of aluminum scandium nitride (AlScN) in 2009 – a material with enhanced electromechanical coupling and piezoelectric properties – had a huge impact on recent thin-film based SAW research. AlScN is also CMOS compatible, high-temperature stable, and shares many other advantages of well-established parent material system AlN, making the transition to a new technology easier as well. In this presentation our recent AlScN material development efforts for going from textured to epitaxial to non-polar epitaxial thin films using magnetron sputtering epitaxy and the integration of AlScN into SAW resonators for RF applications will be discussed. The challenges as well as advantages of higher scandium concentrations in AlScN films will be addressed as well.

 

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by Ralf Brederlow

Lehrstuhl für Schaltungsentwurf, Technische Universität München
 

Abstract

There is an increasingly stronger interaction between microelectronics, applications, and new megatrends in our society: demographic changes (urbanization, health care), sustainability (resource and energy management) and digitalization (from miniaturization over the IoT towards ‘big data’).
This talk will discuss the role of microelectronic sensor circuits and systems in solving critical issues related to those megatrends. After an introduction into those problems, I will show both examples for sensor and for circuit technologies enabling these applications, discuss critical system aspects and how they can be solved by circuit design. To have further impact such electronic systems will need to evolve to a new class of sensor systems: sensor system data need evaluation in the application context to be useful to the society. Also, energy constraints, often given by the application, force us to process and transmit only the useful information. Artificial intelligence can and most likely will support such usefulness in future. Its capability for learning is an additional benefit here. Therefore in the last part I will discuss simple artificial intelligence algorithms, as well as how to make use of them not only in the application context, but also to enhance the performance of sensor systems.

 

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by Virginie Chamard

Aix-Marseille Université, CNRS, Centrale Marseille, Institut Fresnel UMR 7249, 13013 Marseille, France

 

Abstract

Imaging complex crystalline materials at the nanoscale is a major challenge of nanoscience, which calls for a microscopy method combining sensitivity to the crystalline properties, 3D imaging capability, in situ compatibility and high spatial resolution. In this context, the advents of x-ray lensless imaging methods, based on Bragg coherent diffraction, have opened promising perspectives [1] filling the gap between direct microscopies (AFM, SEM, TEM) and reciprocal-space based x-ray Bragg diffraction analysis.

Our group is leading the development of 3D Bragg ptychography microscopy [2], a coherent diffraction imaging method using synchrotron sources, and which merges concepts developed in inverse microscopy and crystallography. This modality is based on the acquisition of far-field Bragg coherent intensity patterns; It exploits the partially redundant information obtained by scanning a finite beam spot size transversally to the sample, while measuring the corresponding 3D far-field intensity diffraction pattern by scanning angularly the sample along the rocking curve. Instead of lenses, numerical tools are employed to retrieve the lost phase [3] and hence the complex-valued sample scattering contrast. Thereby, it ensures access to truly quantitative information, such as the crystalline displacement field, from which the 3D strain component and crystalline plane rotations can be derived, with nanoscale spatial resolution. 3D imaging of extended crystalline samples is then possible [2, 4], opening Bragg coherent diffraction microscopy to a large range of applications.

In this presentation, the general concepts of Bragg ptychography will be first detailed [2-4]. A series of applications of the methods to material science related problems will be shown to illustrate its interest [5-7]. Finally, perspectives in the framework of fourth generation synchrotron sources will be given [8].

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by Enrique Quiroga-González

Institute of Physics, BUAP. Puebla, Mexico

 

Abstract

"Etching is a common process to develop microlectronic devices. It consists of corroding in a controlled manner to sculpt in nano- or micro-sizes. For microelectronics, etching is commonly performed ionically or chemically, allowing to obtain profiles with different levels of anisotropy. Alternatively, one can also etch electrochemically, mainly producing pores; however, these pores can be modulated varying different parameters such voltage, current density, concentration and type of electrolyte, illumination, doping, and temperature.
A similar concept is Metal Assisted Chemical Etching (MACE), which takes advantage of a local electric field, but is an electroless technique. The electric field is generated by a metal-semiconductor junction; etching occurs in the semiconductor at the places where noble metal particles are deposited. It is a simple inexpensive technique, but it commonly produces just vertical structures. One of the main research areas of the Energy Lab at the Institute of Physics of BUAP is to add degrees of freedom to the MACE technique. It has been possible to modulate the diameter, shape, and direction of pores, and to produce new structures like micro-cones or nanowires. The new structures have been useful to develop new electronic or biomedical devices, and for energy storage."

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by Arash Atrsaei

Laboratory of Movement Analysis and Measurement, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland

 

Abstract

"Quantification of mobility is the key to monitor the progression of mobility disorders as well as the effect of an intervention. Inertial measurement units (IMUs) with dedicated algorithms can quantify postural transitions and gait as the two key aspects of mobility in an objective and continuous manner. Assessments performed in the clinic are more indicative of people’s best performance or capacity, while assessments performed at home represent mostly their actual performance. Yet the relationship between these two settings is not fully understood, both due to the existing gaps in technical algorithms as well as challenges in comparing two inherently different domains. To this end, in this talk, I firstly focused on developing and validating algorithms to quantify mobility in both clinical and domestic environments. The added clinical value of these IMU-based mobility assessments was shown in several populations with mobility impairments. Finally, by proposing novel approaches, I focused to bridge the gap between clinical and daily activity assessments."

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In collaboration with seven research associations of the CAU, the online film screening event “Picture a Scientist” was organized, followed by a panel discussion.

About the movie:

Who actually does science?

And why are still predominantly male scientists in our minds when talking about science?

In “Picture a Scientist” a female biologist, a chemist and a geologist take on these questions and take the audience on a journey through the experiences of their academic careers - as women of science.

What:                  Online movie “Picture a Scientist” and panel discussion

When:                  -> Movie: Sunday, 30 May 2021, 5:30 p.m.

                             - Tuesday, 1 June 2021, 5:30 p.m. (48h online access)

                            -> Panel discussion: Tuesday, 1 June 2021, 6:00 – 7:30 p.m.

Panel:                 Moderator Sabine Blackmore

                           Dr. Sonja Grimm (Researcher CRC 1266)

                           Prof. Hinrich Schulenburg (Professor for Evolutionary Ecology and Genetics)

                           Prof. Nahid Talebi (Professor for Solid State Physics)

Important:

  • The event is only open for our CRC members.
  • As the research associations have to pay per participant: Please register with your full name, so we can identify who belongs to which research association.



 

 

Date:     Thursday, June 3rd, 2021

Time:    4:30 - 6:00 pm

 

The two sides of the glass ceiling:

In politics, academia or industry, women in top leadership positions are still an exception.

Women climb the career ladder successfully for a few years, but at some point, and despite the same qualifications as their male colleagues, they reach a position where things don't go any further.

This is often caused by an invisible barrier, the so called “glass ceiling”.
Join Marion Knaths in an informative and entertaining talk, as she exposes the rules of the game between men and women that form and support this "glass ceiling".

Please note

For billing reasons: Please log in to the Zoom meeting with your full name, so we can identify how many members of the CRC participated.

We are looking forward to your participation.

by Sabine Van Huffel

KU Leuven, Dept of Electrical Engineering-ESAT, Stadius Center for Dynamical Systems, Signal Processing and Data Analytics, 3001 Leuven, Belgium

 

Abstract

After a general brief introduction of the BIOMED research group including the research topics under study, several key problems encountered in newborn brain protection in the Neonatal Intensive Care Unit (NICU) are highlighted each of which influences the mental development of the newborn. In particular, we will focus on

 

1. Monitoring abnormality of background Electro-EncephaloGraphy (EEG)

2. Automating seizure detection

3. Quantifying sleep-wake cycling stages from preterm to term 

4. Assessing preterm brain maturation using neural growth charts

5. Effects of perinatal stress  on EEG-based brain dysmaturity

 

Each key problem will be introduced including the main algorithms based on advanced signal processing and machine (deep) learning, together with the associated challenges before using these in clinical practice.  This research strongly benefits from a long-term collaboration with the Neonatal Intensive Care Unit of UZ Leuven, led by professor Gunnar Naulaers.

For more information and additional references, see www.esat.kuleuven.be/stadius/

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by Long-Qing Chen

Department of Materials Science and Engineering and Materials Research Institute, Penn State University, University Park, PA 16802, USA

 

Abstract

Materials research is largely concerned with the study and manipulation of the spatial and temporal evolution of structural, magnetic, electric polarization, and chemical domains in a material as well as their responses to external stimuli. Many of the existing applications of phase-field method have been focused on modeling, reproducing, and understanding the evolution of experimentally observed materials microstructures during processing and in-service conditions or to test analytical theories. This presentation will discuss a few examples on our recent attempts to employ the phase-field method to not only to interpret and understand experimentally observed ferroic domain patterns but also to provide guidance to experimental synthesis and characterization to discover new mesoscale domain states of ferroic materials or achieve dramatically enhanced properties. These include the theory-guided design of materials include the discovery of polar vortex lattices, skyrmions, and unusual negative capacitances in ferroelectric superlattices, synthesis of record-high piezoelectricity in ferroelectric relaxor ceramics and single crystals, and the discovery of simultaneous near-perfect light transparency and ultrahigh piezoelectricity through AC poling.

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Contact

gus@tf.uni-kiel.de

Chairman:

Prof. Dr. Gerhard Schmidt

Kiel University
Institute for Electrical Engineering and Information Engineering

 

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 

Olshausenstraße 62 
D-24118 Kiel

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