Stefan Gerth

Stefan Gerth
Fraunhofer Institute for Integrated Circuits IIS | IIS · Development Center for X-Ray Technology

PhD

About

30
Publications
6,778
Reads
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453
Citations
Additional affiliations
April 2016 - present
Fraunhofer Institute for Integrated Circuits IIS
Position
  • Group Leader
April 2013 - April 2016
Fraunhofer Institute for Integrated Circuits IIS
Position
  • scientific assistant
October 2008 - December 2012
Friedrich-Alexander-University of Erlangen-Nürnberg
Position
  • PhD Student
Education
October 2008 - March 2013
October 2003 - October 2008

Publications

Publications (30)
Article
Full-text available
Motivation: Within the field of bio-implants one topic deals with the in-vitro production of 3D tissues from cell cultures. A major challenge in the cultivation of biopreparations is the imitation of the vascular system with its surrounding tissue. Additiv manufacturing of such vascularisation could be supported with an adequate template from high-...
Chapter
This chapter addresses the technological parts of a CT system used for crop phenotyping. First, all of the hardware components are described and explained. Thus, it is shown how they are utilized for phenotyping purposes. After that, different system setups and ways of acquiring a CT dataset are shown. Additionally, the post processing of the gener...
Article
Full-text available
Background In India, raw peanuts are obtained by aggregators from smallholder farms in the form of whole pods and the price is based on a manual estimation of basic peanut pod and kernel characteristics. These methods of raw produce evaluation are slow and can result in procurement irregularities. The procurement delays combined with the lack of st...
Article
Full-text available
Despite the importance of storage root (SR) organs for cassava and the other root crops yield, their developmental origin is poorly understood. Here we use multiple approaches to shed light on the initial stages of root development demonstrating that SR and fibrous roots (FR) follow different rhizogenic processes. Transcriptome analysis carried out...
Article
This work explored 3D bioplotting to mimic the intrinsic hierarchical structure of natural articular cartilage. Alginate dialdehyde-gelatine (ADA-GEL) was used as a hydrogel ink to create hierarchically ordered scaffolds. In comparison to previously reported ADA-GEL compositions, we introduce a modified formulation featuring increased amounts of th...
Article
Full-text available
As a consequence of climate change, heat waves in combination with extended drought periods will be an increasing threat to crop yield. Therefore, breeding stress tolerant crop plants is an urgent need. Breeding for stress tolerance has benefited from large scale phenotyping, enabling non-invasive, continuous monitoring of plant growth. In case of...
Article
Full-text available
XXL-Computed Tomography (XXL-CT) is able to produce large scale volume datasets of scanned objects such as crash tested cars, sea and aircraft containers or cultural heritage objects. The acquired image data consists of volumes of up to and above $$\hbox {10,000}^{3}$$ 10,000 3 voxels which can relate up to many terabytes in file size and can conta...
Article
Full-text available
Background: Computed X-ray tomography (CTX) is a high-end nondestructive approach for the visual assessment of root architecture in soil. Nevertheless, in order to evaluate high-resolution CTX data of root architectures, manual segmentation of the depicted root systems from large-scale volume data is currently necessary, which is both time consumi...
Article
Full-text available
When dense granular matter is sheared, the strain is often localized in shear bands. After some initial transient these shear bands become stationary. Here, we introduce a setup that periodically creates horizontally aligned shear bands which then migrate upward through the sample. Using x-ray radiography we demonstrate that this effect is caused b...
Article
Full-text available
Background: Improving abiotic stress tolerance in wheat requires large scale screening of yield components such as seed weight, seed number and single seed weight, all of which is very laborious, and a detailed analysis of seed morphology is time-consuming and visually often impossible. Computed tomography offers the opportunity for much faster an...
Article
CdS nanoparticles in a glass matrix are attractive material for applications in numerous fields, especially optics. However, the growth kinetics of such nanoparticles and its effect on optical properties is still under investigation. Here, the influence of the heat treatment on the nanoparticles was investigated using SAXS and WAXS. The CdS nanopar...
Chapter
Additive manufacturing of hydrogel-based implants, as e.g for the human skull are becoming more important as they should allow a modelling of the different natural layers of the skullcap, and support the bone healing process. Nevertheless, the quality, structure and consistency of such 3D-printed hydrogel implants are important for the reliable pro...
Article
When investigating dynamical processes in granular systems, it is frequently necessary to measure the time-resolved local material density. Recently, x-ray radiography facilities became available in many laboratories and can be used to measure the volume fraction via the attenuation of x-ray radiation along the beam direction. Naïve application of...
Conference Paper
The application of the 3D mean-shift filter to 3D Computed Tomography Data enables the segmentation of internal traits. Specifically in maize seeds this approach gives the opportunity to separate the internal structure, for example the volume of the embryo, the cavities and the low and high dense parts of the starch body. To evaluate the mean-shift...
Article
Full-text available
One of the most challenging computer vision problems in the plant sciences is the segmentation of roots and soil in X-ray tomography. So far, this has been addressed using classical image analysis methods. In this paper, we address this soil–root segmentation problem in X-ray tomography using a variant of supervised deep learning-based classificati...
Presentation
Our world is three-dimensional, so 2D-based phenotyping methods are inevitably limited and leave out significant aspects of a plant. Employing 3D imaging methods can lead to more precise data, more complete coverage of the plant and even reveal insights that are not possible using other methods. The presentation shows a number of 3D contactless ac...
Article
de Für die Schwingprüfung und numerische Prozesssimulation wird eine hohe Anzahl an Prüfkörpern aus der Legierung AlSi7Mg0,3 hergestellt und mittels Computertomografie charakterisiert. Die experimentell gewonnenen Erkenntnisse zur Porosität werden in Zusammenhang mit den Herstellungsbedingungen gestellt, als maßgeblicher Parameter steht dabei der W...
Article
Small angle X-ray and neutron scattering on Cd and S doped glass annealed at 600 degrees C shows after the first 12 h nucleation and growth of spherical CdS nanoparticles with a radius of up to 34 +/- 4 angstrom. After the nucleation is completed after 24 h, further growth in this amorphous environment is governed by oriented particle attachment me...
Article
Full-text available
Roots are vital to plants for soil exploration and uptake of water and nutrients. Root performance is critical for growth and yield of plants, in particular when resources are limited. Since roots develop in strong interaction with the soil matrix, tools are required that can visualize and quantify root growth in opaque soil at best in 3D. Two moda...
Article
The increasing demand for light weight and efficiency of modern combustion engines requires sophisticated light alloys with improved high-temperature strength and creep resistance. Nowadays AlSi alloys are used for structural parts as these materials offer increased wear resistance and long-term stability under operating conditions. The heterogeneo...
Article
The interfacial structure and phase diagram of a micellar solution formed by the three block copolymer (EO20-PO70-EO20) also known as P123 solved in deuterated water close to a solid boundary is investigated with respect to temperature. We find a hysteretic behavior of the d-spacing of the micellar crystal and a spontaneous change in the lateral co...
Article
Aqueous solutions containing Cd2+ and S2- ions have been brought together in a T-mixer, and the formation of CdS nanoparticles has been monitored by ultrafast X-ray small angle scattering down to 0.2 ms. While no particle formation is observed for a laminar flow, their growth can be followed in-situ for conditions of turbulent flow.
Thesis
The adsorption of P123 at the solid-liquid interface is investigated under various conditions (temperature, concentration, shear) using time-of-flight neutron reflectivity. Different types of adsorption can be shown to exists. Several slabs are adsorbed on top of the native Si oxid layer. Their adsorption varies with temperature and concentration,...
Article
On a hydrophilic substrate the growth of a Bragg peak was observed at Q approximate to 0.05 angstrom(-1) which we attribute to a layering of micelles. This ordering is destroyed when the system is sheared. When shear is removed, it builds up and reaches equilibrium at ambient temperature after approximately 700s. However, there is a waiting time of...
Article
Our long term scientific interest is the understanding of the interface properties of flowing liquids on a microscopic level. Various mechanisms have been introduced to explain the origin of slip at a solid-liquid interface like the formation of a thin depletion layer or a molecular ordering of the liquid near the interface. Reflectometry (using x-...
Article
Full-text available
We present a neutron reflectivity study on interfaces in contact with flowing hexadecane, which is known to exhibit surface slip on functionalized solid surfaces. The single crystalline silicon substrates were either chemically cleaned Si(100) or Si(100) coated by octadecyl-trichlorosilane (OTS), which resulted in different interfacial energies. Th...

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Projects

Projects (7)
Project
Zur Vernetzung von Forschung und Wirtschaft hat das Fraunhofer-Institut für Integrierte Schaltungen IIS in Kooperation mit der Friedrich-Alexander-Universität Erlangen-Nürnberg und der Ludwig-Maximilians-Universität München unter weiterer Beteiligung der Fraunhofer-Institute IKS und IISB eine einzigartige Forschungsinfrastruktur in Bayern geschaffen: das ADA Lovelace Center for Analytics, Data and Applications. Es verbindet als Kooperationsplattform für Wissenschaft und Wirtschaft auf innovative Art KI-Forschung mit KI-Anwendungen. Das Besondere am ADA Lovelace Center ist tatsächlich die enge Verbindung aus Forschung und industrieller Anwendung: Mit der Art und Weise, wie wir unsere Kompetenzen, Methoden und Verfahren aus dem Bereich der Künstlichen Intelligenz in den Fragestellungen der Praxis einsetzen und an ihnen weiterentwickeln, wie wir an Projekte herangehen und wie wir mit unseren Partnern aus Industrie und Wissenschaft zusammenarbeiten, wollen wir den Zugang der Unternehmen zu umfassender KI-Expertise erleichtern und so schnell konkreten Nutzen für sie herstellen; und zwar über die Grenze des derzeit Machbaren hinaus. So wollen wir Unternehmen vom enormen Potenzial von KI überzeugen und KI in die industrielle Anwendung bringen: Das ADA Lovelace Center versteht sich als Multiplikator, um KI-Kompetenz in einem Unternehmen aufzubauen oder die vorhandene KI-Kompetenz zu stärken bzw. weiterzuentwickeln. Das wissenschaftliche Methodenspektrum, das wir im ADA Lovelace Center dafür einsetzen, ist sehr breit und die Auswahl der richtigen Methode abhängig vom Anwendungsfall. Immer aber geht es bei uns um Datenanalyse: von der klassischen Zustandsbeschreibung über Vorhersagen von Ereignissen bis hin zu entscheidungsbasierten Methoden, die z.B. automatisiert eine bestimmte Handlung auslösen sollen. Dazu binden wir übrigens neben den genannten regionalen Playern auch viele andere nationale und internationale Wissenschaftspartner ein. An folgenden Kompetenzsäulen wird geforscht: • Automatisches Lernen • Sequenzbasiertes Lernen • Erfahrungsbasiertes Lernen • Few Labels Learning • Erklärbares Lernen • Mathematische Optimierung • Semantik • Few Data Learning Eine Beschreibung zu den oben genannten Kompetenzsäulen kann unter diesem Link https://www.scs.fraunhofer.de/de/referenzen/ada-center.html#381039553 gefunden werden.