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252907

Research outputs

As an application-oriented research organisation, Fraunhofer aims to conduct highly innovative and solution-oriented research - for the benefit of society and to strengthen the German and European economy.

13381

Projects

Fraunhofer is tackling the current challenges facing industry head on. By pooling their expertise and involving industrial partners at an early stage, the Fraunhofer Institutes involved in the projects aim to turn original scientific ideas into marketable products as quickly as possible.

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Researchers

Scientific achievement and practical relevance are not opposites - at Fraunhofer they are mutually dependent. Thanks to the close organisational links between Fraunhofer Institutes and universities, science at Fraunhofer is conducted at an internationally first-class level.

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Institutes

The Fraunhofer-Gesellschaft is the leading organisation for applied research in Europe. Institutes and research facilities work under its umbrella at various locations throughout Germany.

Recent Additions

  • Publication
    Influence of surface preheating and pretreatment on the adhesion of laser-melted PEEK to aluminum substrates
    The high-performance polymer Polyether ether ketone (PEEK) is commonly used as friction-reducing coating in many areas of mechanical engineering. However, the coating of temperature-sensitive components is only possible to a limited extent due to the high hardness loss of the component during conventional oven processing at elevated temperatures to melt the PEEK layers. Alternatively, laser radiation can be used to melt the particulate PEEK layers and simultaneously reduce the thermal load on the substrate. A key challenge of these processes, however, lies in ensuring sufficient adhesion between the molten PEEK layer and the metal substrate. This study addresses the laser pretreatment of EN AW 6082 aluminum and investigates how the surface topography and preheating temperature of the substrate affect the adhesion behavior of the PEEK layer after laser-based melting as well as the hardness loss of the substrate during laser melting.
  • Publication
    Quantum approximate optimization algorithm for qudit systems with long-range interactions
    ( 2022-04-01)
    Deller, Yannick
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    Schmitt, Sebastian
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    Lewenstein, Maciej
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    Lenk, Steve
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    Federer, Marika
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    Jendrzejewski, Fred
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    Hauke, Philipp
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    Kasper, Valentin
    A frequent starting point of quantum computation platforms are two-state quantum systems, i.e., qubits. However, in the context of integer optimization problems, relevant to scheduling optimization and operations research, it is often more resource-efficient to employ quantum systems with more than two basis states, so-called qudits. Here, we discuss the quantum approximate optimization algorithm (QAOA) for qudits, layout its implementation in platforms with long-range interactions between qudits such as trapped ions, cold atomic mixtures, Rydberg atoms and atoms in cavities. We illustrate how the QAOA can be used to formulate a variety of integer optimization problems such as graph coloring problems or electric vehicle (EV) charging optimization. In addition, we comment on the implementation of constraints and describe three methods to include these into a quantum circuit of a QAOA by penalty contributions to the cost Hamiltonian, conditional gates using ancilla qubits, and a dynamical decoupling strategy. Finally, as a showcase of qudit-based QAOA, we present numerical results for a charging optimization problem mapped onto a max-$k$-graph coloring problem. Our work illustrates the flexibility of qudit systems to solve integer optimization problems.
  • Publication
    Development of a Metal-Based Lightweight Approach Consisting of Cold-Formable Magnesium Sheets in Combination with a Multi-Purpose Powder Coating System
    ( 2022-11-22)
    Victoria-Hernández, José
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    ;
    Vakulenko, Serhii
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    Gedan-Smolka, Michaela
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    Tuschla, Marcel
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    Letzig, Dietmar
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    Kwiatkowski, Lech
    This paper will give an overview about the development of a material system, which consists of a novel formable magnesium alloy that is provided with an effective corrosion protection coating. The corrosion protection is to be realized in the form of a forming stable powder coating, which can be applied in the coil coating process. To improve the tribological properties, additional additives are added to the powder coating. Within this paper, first results concerning tribological and forming behavior of the new lightweight material system are given. For the benchmark, the results are compared with commercially available AZ31 Mg alloy.

Most viewed

  • Publication
    Semi-automated inspection unit for ceramics
    ( 2016)
    Wolf, Christian
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    Lehmann, Andreas
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    Unglaube, Gregor
    A swept source optical coherence tomography system (SS OCT) combined with the convenience of automated scanning capabilities defines an innovative way to inspect large objects three-dimensional in high-resolution. The OCT is an optical, non-destructive and non-contact measurement technology, which generates unique object data with up to 2 mm axial resolution. Our inspection system with a three-axis robotic positioning system is capable of measuring large areas up to 400 mm in square instead of the limited field of view of existent OCT setups. It demonstrates the capability for in-depth and high-speed quality inspections on high performance ceramic electrolytes. This makes it possible to detect flaws, like cracks, pinholes or inclusions in such samples. Pristine used in medical applications, the relevance of OCT for testing of non-biological samples in manufacturing and research is increasing. We presented a combination of SS OCT and a semi-automated scanning robot, which is perfectly suited for high-resolution, in-depth and high-speed acquisition needed for in-line quality management of high-performance ceramics and other materials.
  • Publication
    Potentialanalyse selbst gemacht
    ( 2005)
    Keller, Mathias
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    Rittscher, Jens
    Betriebsdatenerfassung, BDE, ist die Grundlage zum Entdecken von Optimierungspotentialen im Unternehmen. Die BDE stellt bereits heute für viele Unternehmen der Herstellung und Weiterverarbeitung von Stahl eine technisch einfache und kostengünstige Möglichkeit dar, ihre Anlagenabläufe zu steuern. Gerade kleine und mittelständische Unternehmen aus der Stahlindustrie können sich mit einer Potentialanalyse aus eigener Kraft heraus optimieren.
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