TY - GEN A1 - Weißhaupt, David A1 - Funk, Hannes S. A1 - Sürgers, Christoph A1 - Fischer, Gerda A1 - Oehme, Michael A1 - Schwarz, Daniel A1 - Fischer, Inga Anita A1 - Slageren, Joris van A1 - Schulze, Jörg T1 - Formation of Mn5Ge3 on a Recess-Etched Ge (111) Quantum-Well Structure for Semiconductor Spintronics T2 - 44th International Convention on Information, Communication and Electronic Technology, MIPRO 2021, Opatija, Croatia, September 27 - Oct. 1, 2021 Y1 - 2021 SN - 978-1-6654-4761-4 U6 - https://doi.org/10.23919/MIPRO52101.2021.9596924. SN - 978-953-233-101-1 SP - 45 EP - 49 PB - Piscataway CY - IEEE ER - TY - BOOK A1 - Zundel, Stefan A1 - Blättel-Mink, Birgit A1 - Brohmann, Bettina A1 - Defila, Rico A1 - Di Giulio, Antonietta A1 - Fischer, Daniel A1 - Fuchs, Doris A1 - Gölz, Sebastian A1 - Götz, Konrad A1 - Homburg, Andreas A1 - Kaufmann-Hayoz, Ruth A1 - Matthies, Ellen A1 - Michelsen, Gerd A1 - Schäfer, Martina A1 - Tews, Kerstin A1 - Wassermann, Sandra T1 - Konsum-Botschaften : was Forschende für die gesellschaftliche Gestaltung nachhaltigen Konsums empfehlen Y1 - 2013 SN - 978-3-7776-2371-9 PB - Hirzel Verlag CY - Stuttgart ET - 1. Auflage ER - TY - GEN A1 - Schwartz, Bernhard A1 - Oehme, Michael A1 - Kostecki, Konrad A1 - Widmann, Daniel A1 - Gollhofer, Martin A1 - Körner, Roman A1 - Bechler, Stefan A1 - Fischer, Inga Anita A1 - Wendav, Torsten A1 - Kasper, Erich A1 - Schulze, Jörg A1 - Kittler, Martin T1 - Electroluminescence of GeSn/Ge MQW LEDs on Si substrate T2 - Optics Letters Y1 - 2015 U6 - https://doi.org/10.1364/OL40.003209 VL - 40 IS - 13 SP - 3209 EP - 3212 ER - TY - CHAP A1 - Fischer, Ulrich A1 - Voigt, Andre A1 - Tannert, Daniel A1 - Krautz, Hans Joachim T1 - Pressure and Temperature Influence on Alkine Electrolysis Performance T2 - Proceedings of 5th European PEFC and H2 Forum, Luzern, Schweiz, June/July 2015 Y1 - 2015 SN - 978-3-905592-19-1 PB - European Fuel Cell Forum AG CY - Luzern-Adligenswil ER - TY - CHAP A1 - Fischer, Ulrich A1 - Voigt, Andre A1 - Tannert, Daniel A1 - Krautz, Hans Joachim T1 - Influence of variable operating parameters on the process of the advanced alkaline pressurised electrolysis T2 - 9th International Renewable Energy Storage Conference and Exhibition (IRES 2015), 09 - 11 March 2015, Düsseldorf, Germany Y1 - 2015 PB - EUROSOLAR [u.a.] CY - Bonn ER - TY - CHAP A1 - Fischer, Ulrich A1 - Voigt, Andre A1 - Tannert, Daniel A1 - Krautz, Hans Joachim T1 - Druckelektrolyse zur Wasserstoffherstellung- eine Kurzübersicht zu energetischen Vor- und Nachteilen T2 - Nutzung regenerativer Energiequellen und Wasserstofftechnik 2015, 22. Symposium Nutzung Regenerativer Energiequellen und Wasserstofftechnik, Stralsund, 5. - 7. November 2015 Y1 - 2015 SN - 978-3-9817740-0-9 SP - 30 EP - 36 PB - Fachhochschule Stralsund CY - Stralsund ER - TY - CHAP A1 - Fischer, Ulrich A1 - Tannert, Daniel A1 - Voigt, Andre A1 - Ziems, Christian A1 - Krautz, Hans Joachim A1 - Barz, Mirko A1 - Dinkler, Konstantin T1 - Renewable Energy Storage by Hydrogen Production from Water Electrolysis T2 - Technical and Economic Aspects of Renewable Energies - Know-How Transfer as Development Opportunity for Southern Europe Y1 - 2016 SN - 978-3-86387-721-7 SP - 118 EP - 126 PB - Mensch und Buch CY - Berlin ER - TY - CHAP A1 - Fischer, Ulrich A1 - Krautz, Hans Joachim A1 - Wenske, Michael A1 - Tannert, Daniel A1 - Krüger, Perco A1 - Ziems, Christian A1 - Stolten, Detlef A1 - Emonts, Bernd T1 - Hydrogen Hybrid Power Plant in Prenzlau, Brandenburg T2 - Hydrogen Science and Engineering - Materials, Processes, Systems and Technology, Bd. 2 Y1 - 2016 SN - 978-3-5273323-8-0 SP - 1033 EP - 1052 PB - Wiley-VCH CY - Weinheim ER - TY - GEN A1 - Körner, Roman A1 - Schwarz, Daniel A1 - Fischer, Inga Anita A1 - Augel, Lion A1 - Bechler, Stefan A1 - Hänel, Linda A. A1 - Kern, Michael A1 - Oehme, Michael A1 - Rolseth, Erlend Granbo A1 - Schwartz, Bernhard A1 - Weißhaupt, David A1 - Zhang, Wogong A1 - Schulze, Jörg T1 - The Zener-Emitter: A Novel Superluminescent Ge Optical Waveguide-Amplifier with 4.7 dB Gain at 92 mA Based on Free-Carrier Modulation by Drect Zener Tunneling Monolithically Integrated on Si T2 - 2016 IEEE International Electronic Devices Meeting (IEDM), 3-7 Dec. 2016 Y1 - 2016 SN - 978-1-5090-3901-2 SN - 978-1-5090-3902-9 SP - 22.5.1 EP - 22.5.4 PB - IEEE CY - Piscataway, NJ ER - TY - GEN A1 - Boch, Steffen A1 - Allan, Eric A1 - Birkhofer, Klaus A1 - Bossdorf, Oliver A1 - Blüthgen, Nico A1 - Christ-Breulmann, Sabina A1 - Diekötter, Tim A1 - Dormann, Carsten F. A1 - Gossner, Martin M. A1 - Hallmann, Christine A1 - Hemp, Andreas A1 - Hölzel, Norbert A1 - Jung, Kirsten A1 - Klaus, Valentin H. A1 - Klein, Alexandra M. A1 - Kleinebecker, Till A1 - Lange, Markus A1 - Müller, Jörg A1 - Nacke, Heiko A1 - Prati, Daniel A1 - Renner, Swen C. A1 - Rothenwöhrer, Christoph A1 - Schall, Peter A1 - Schulze, Ernst-Detlef A1 - Socher, Stephanie A. A1 - Tscharntke, Teja A1 - Türke, Manfred A1 - Weiner, Christiane N. A1 - Weisser, Wolfgang W. A1 - Westphal, Catrin A1 - Wolters, Volkmar A1 - Wubet, Tesfaye A1 - Fischer, Markus T1 - Extensive und jährlich wechselnde Nutzungsintensität fördert den Artenreichtum im Grünland T2 - ANLIEGEN NATUR Y1 - 2016 UR - https://www.biom.uni-freiburg.de/mitarbeiter/dormann/boch2016anliegennatur.pdf SN - 1864-0729 VL - 38 IS - 1 SP - 86 EP - 95 ER - TY - GEN A1 - Schmidt, Thomas A1 - Ahrens, Christian A1 - Flege, Jan Ingo A1 - Jaye, Cherno A1 - Fischer, Daniel A. A1 - Falta, Jens T1 - Growth of Epitaxial 3,4,9,10-Perylene Tetracarboxylic Dianhydride on Bi-Terminated Silicon T2 - Journal of Physical Chemistry C N2 - The epitaxial quality of thin films crucially depends on their interaction with the substrate. Up to now, Ag-terminated Si(111) has been employed as the model substrate for the growth of 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) on semiconductors. In this study, we will show that Bi termination results in PTCDA films of superior epitaxial quality. We have studied the growth of PTCDA on bismuth-passivated Si(111) in detail by means of spot profile analysis of low-energy electron diffraction (SPA-LEED), X-ray photoemission spectroscopy (XPS), near-edge X-ray absorptionfine structure (NEXAFS), and scanning tunneling microscopy (STM). The XPS results reveal the presence of intact PTCDA molecules on the surface upon adsorption. NEXAFS data indicate the PTCDA molecules being oriented with their molecular plane parallel to the surface. STM shows a very smooth growth front of the PTCDA film, preserving the step structure of the substrate. High-resolution SPA-LEED data demonstrate the presence of a multidomain surface with a rich variety of PTCDA surface structures, which were identified to be most prominently herring-bone polytypes. However, in the monolayer range, quadratic brick-wall structures and a nearly square-like structure as well as a perylene-like structure have also been found. Despite the simultaneous presence of multiple domains, the individual domains show excellent lateral ordering, with larger domain sizes as compared to the case of Ag-terminated Si(111). KW - dianhydride KW - Bi-terminated silicon KW - spot profile analysis of low-energy electron diffraction (SPA-LEED) KW - X-ray photoemission spectroscopy (XPS) KW - near-edge X-ray absorptionfine structure (NEXAFS) KW - scanning tunneling microscopy (STM) Y1 - 2019 U6 - https://doi.org/10.1021/acs.jpcc.8b10396 SN - 1932-7447 SN - 1932-7455 VL - 123 IS - 12 SP - 7097 EP - 7109 ER - TY - GEN A1 - Tannert, Daniel A1 - Ziems, Christian A1 - Voigt, André A1 - Fischer, Ulrich A1 - Krautz, Hans Joachim T1 - Wasserstoff- und Elektrolyseforschung an der BTU Cottbus - Senftenberg T2 - VGB PowerTech Y1 - 2018 SN - 1435-3199 VL - 98 IS - 8 SP - 65 EP - 69 ER - TY - GEN A1 - Voigt, André A1 - Fischer, Ulrich A1 - Tannert, Daniel A1 - Krautz, Hans Joachim T1 - Analyse erneuerbarer P2H2 Energiesystemkonfigurationen unter Verwendung von Matlab T2 - Nutzung regenerativer Energiequellen und Wasserstofftechnik 2017 ; 24. Symposium Nutzung Regenerativer Energiequellen und Wasserstofftechnik, Stralsund, 09. bis 11. November 2017 Y1 - 2017 SN - 978-3-9817740-3-0 SP - 143 EP - 147 PB - HOST - Hochschule Stralsund CY - Stralsund ER - TY - GEN A1 - Fischer, Ulrich A1 - Voigt, André A1 - Tannert, Daniel A1 - Krautz, Hans Joachim T1 - Standortevaluierung und System-pfadanalyse im Forschungsprojekt WESpe – Wissenschaftliche Forschung zu Windwasserstoff-Energiespeichern T2 - Nutzung regenerativer Energiequellen und Wasserstofftechnik 2016 ; energie-symposium, 23. Symposium Nutzung Regenerativer Energiequellen und Wasserstofftechnik, Stralsund, 3. - 5. November 2016 Y1 - 2016 SN - 978-3-9817740-1-6 VL - 2016 SP - 143 EP - 147 PB - Fachhochschule Stralsund CY - Stralsund ER - TY - GEN A1 - Wanner, Manfred A1 - Birkhofer, Klaus A1 - Fischer, Thomas A1 - Shimizu, Miki A1 - Shimano, Satoshi D. A1 - Puppe, Daniel T1 - Soil Testate Amoebae and Diatoms as Bioindicators of an Old Heavy Metal Contaminated Floodplain in Japan T2 - Microbial Ecology Y1 - 2020 U6 - https://doi.org/10.1007/s00248-019- 01383-x SN - 1432-184X SN - 0095-3628 VL - 79 IS - 1 SP - 123 EP - 133 ER - TY - GEN A1 - Fischer, Inga Anita A1 - Clausen, Caterina J. A1 - Schwarz, Daniel A1 - Zaumseil, Peter A1 - Capellini, Giovanni A1 - Virgilio, Michele A1 - Da Silva Figueira, Maria Cecilia A1 - Birner, Stefan A1 - Koelling, Sebastian A1 - Koenraad, Paul M. A1 - Huang, Michael R. S. A1 - Koch, Christoph T. A1 - Wendav, Torsten A1 - Busch, Kurt A1 - Schulze, Jörg T1 - Composition analysis and transition energies of ultrathin Sn-rich GeSn quantum wells T2 - Physical Review Materials Y1 - 2020 U6 - https://doi.org/10.1103/PhysRevMaterials.4.024601 SN - 2475-9953 VL - 4 IS - 2 ER - TY - GEN A1 - Weißhaupt, David A1 - Funk, Hannes S. A1 - Kern, Michal A1 - Dettling, Marco M. A1 - Schwarz, Daniel A1 - Oehme, Michael A1 - Sürgers, Christoph A1 - Slageren, Joris van A1 - Fischer, Inga Anita A1 - Schulze, Jörg T1 - Weak localization and weak antilocalization in doped Ge1-ySny layers with up to 8% Sn T2 - Journal of Physics: Condensed Matter Y1 - 2021 U6 - https://doi.org/10.1088/1361-648X/abcb68 SN - 1361-648X VL - 33 IS - 8 ER - TY - GEN A1 - Bergmann, Fritz A1 - Ayasse, Markus A1 - Schlipf, Jon A1 - Mörz, Florian A1 - Weißhaupt, David A1 - Oehme, Michael A1 - Prucnal, Slawomir A1 - Kawaguchi, Yuma A1 - Schwarz, Daniel A1 - Fischer, Inga Anita A1 - Schulze, Jörg T1 - Plasmonic gratings from highly doped Ge1−ySny films on Si T2 - Journal of Physics D: Applied Physics Y1 - 2021 SN - 1361-6463 VL - 54 IS - 44 ER - TY - GEN A1 - Preußer, Daniel A1 - Bröring, Udo A1 - Fischer, Thomas A1 - Juretzek, Thomas T1 - Effects of antibiotics ceftriaxone and levofloxacin on the growth of Calliphora vomitoria L. (Diptera: Calliphoridae) and effects on the determination of the post-mortem interval T2 - Journal of Forensic and Legal Medicine N2 - The determination of the post-mortem interval (PMI) is one of the main tasks of forensic entomology, where growth and stages of development of arthropods are used for PMI determination. It is well acknowledged that maggot development is significantly influenced by temperature. Attention has also been paid to the microbial populations of the cadaver, because toxic substances contained in the substrate can influence the microorganisms and affect arthropods growth and development. However, little is known about the influence of antibiotics taken during lifetime of a person on insect development after that persons death. The aim of this study was to test the hypothesis that the antibiotics ceftriaxone and levofloxacin cause inhibition of growth and delay of pupation of the blow fly Calliphora vomitoria, which would then lead to an incorrect determination of the post-mortem interval in forensic cases. It was found that maggot development was delayed by levofloxacin mixed in minced pork, where a mixture of both antibiotics increased this effect. The maggot growth in the samples with ceftriaxone was not delayed. Pupation was delayed in treatments with a mixture of both antibiotics. The mortality was reduced by separate or combined application of ceftriaxone and levofloxacin, which we attribute to a bactericidal effect of the antibiotics on maggot pathogens. Depending on the concentration of the antibiotics, an underestimation of the post-mortem interval between 24 and 48 h could be suspected. We conclude that antibiotics need to be considered if instar stages are to be used to determine the PMI and that some antibiotics may improve the breeding conditions of maggots. KW - Antibiotics KW - Blowflies KW - Entomotoxicology KW - Post-mortem interval Y1 - 2021 U6 - https://doi.org/10.1016/j.jflm.2021.102207 SN - 1878-7487 SN - 1752-928X VL - 81 IS - 5 ER - TY - GEN A1 - Elogail, Yasmine A1 - Berkmann, Fritz A1 - Clausen, Caterina J. A1 - Fischer, Inga Anita A1 - Hänel, Linda A. A1 - Schwarz, Daniel A1 - Schulze, Jörg T1 - Investigation of Ge-Based P-Channel Planar-Doped Barrier FETs integrated on Si T2 - Microelectronics Journal Y1 - 2022 U6 - https://doi.org/10.1016/j.mejo.2022.105404 SN - 1879-2391 VL - 123 ER - TY - GEN A1 - Xie, Yufang A1 - Birowska, Magdalena A1 - Funk, Hannes S. A1 - Fischer, Inga Anita A1 - Schwarz, Daniel A1 - Schulze, Jörg A1 - Zeng, Yu-Jia A1 - Helm, Manfred A1 - Zhou, Shengqiang A1 - Prucnal, Slawomir T1 - Tuning of Curie temperature in Mn5Ge3 films T2 - Journal of Applied Physics Y1 - 2022 U6 - https://doi.org/10.1063/5.0066717 SN - 1089-7550 VL - 131 SP - 105102-1 EP - 105102-8 ER - TY - GEN A1 - Steuer, Oliver A1 - Schwarz, Daniel A1 - Oehme, Michael A1 - Schulze, J. A1 - Maczko, H. A1 - Kudrawiec, Robert A1 - Fischer, Inga Anita A1 - Heller, R. A1 - Hübner, R. A1 - Khan, M. M. A1 - Georgiev, Yordan M. A1 - Zhou, Shengqiang A1 - Helm, M. A1 - Prucnal, Slawomir T1 - Band-gap and strain engineering in GeSn alloys using post-growth pulsed laser melting T2 - Journal of Physics: Condensed Matter Y1 - 2022 U6 - https://doi.org/10.1088/1361-648X/aca3ea SN - 1361-648X VL - 35 IS - 5 ER - TY - GEN A1 - Preußer, Daniel A1 - Fischer, Thomas A1 - Juretzek, Thomas T1 - Effects of antibiotics ceftriaxone and levofloxacin on the growth of Protophormia terraenovae (Diptera: Calliphoridae) T2 - Forensic Science, Medicine and Pathology N2 - AbstractProtophormia terraenovae is a colonizer of decomposing bodies and is known to cause pre-mortem myiasis as the female flies lay eggs in uncleaned wounds. In this study the effects of different concentrations of antibiotics levofloxacin and ceftriaxone on maggot development, weight, length, and mortality were examined. The maggot length and weight were significantly increased by therapeutical doses of levofloxacin and ceftriaxone. The maggot development time was significantly decreased in every levofloxacin treatment compared to the control. The time to start pupation was significantly increased in the control compared to the antibiotic treatments. Levofloxacin significantly increased the survivability of the maggots. Every levofloxacin treatment significantly improved the rearing conditions for the maggots. Reaching the third instar was delayed by 24 h in the control compared to the Levo 3.57 treatment. The Pupation in the control was delayed by an average of 48 h compared to the Levo 3.57 treatment. The significantly reduced development time of the maggots in the antibiotic treatments might lead to an overestimation of the post-mortem interval and therefore an incorrect time of death determination. The improved rearing conditions may be an indication of the potential of a combined application of antibiotics and maggot therapy. KW - General Medicine KW - Pathology and Forensic Medicine Y1 - 2024 U6 - https://doi.org/10.1007/s12024-024-00804-9 SN - 1556-2891 SP - 1 EP - 13 ER - TY - GEN A1 - Preußer, Daniel A1 - Fischer, Thomas A1 - Juretzek, Thomas T1 - Effects of antibiotics ceftriaxone and levofloxacin on the growth of Lucilia sericata (Diptera: Calliphoridae) T2 - Medical and Veterinary Entomology N2 - Lucilia sericata is one of the most studied species in forensic entomology due to its widespread distribution, forensic importance as well as medical use. The growth and development stage of maggots is often used to determine the post-mortem interval in forensic cases. L. sericata can cause myiasis in humans who are not able to maintain personal hygiene due to age or medical condition and can therefore be used to determine the time period of neglect. The influence of the temperature on the maggot development has been examined in various studies. Different examinations on the effects of toxic substances on the maggot development and survival have been conducted in order to test the influence and resulting deviations. In this study, the effects of different therapeutical doses of the antibiotics ceftriaxone and levofloxacin were examined on L. sericata in order to determine and compare deviations in maggot development and survival. The used antibiotics did not significantly influence the maggot weight and length. A significant delay in the time of pupation has been determined in the treatments with high concentrations of levofloxacin. The mortality was significantly increased in all treatments with antibiotics compared to the control, whereby the survivability of all treatments remained over 80%. Because of the high doses needed to produce an effect, we concluded that an overestimation of the post-mortem interval is unlikely but higher antibiotic concentrations or possible interactions with other medications could increase the maggot development time. KW - antibiotics KW - blow flies KW - entomotoxicology KW - myiasis KW - post‐mortem interval Y1 - 2023 U6 - https://doi.org/10.1111/mve.12685 SN - 0269-283X SN - 1365-2915 VL - 37 IS - 4 SP - 805 EP - 815 ER - TY - GEN A1 - Berkmann, Fritz A1 - Povolni, Pavel A1 - Schwarz, Daniel A1 - Fischer, Inga Anita T1 - Influence of material and geometry parameters on resonance linewidths of plasmonic modes in gratings made from highly doped Ge1−xSnx T2 - Journal of Physics D: Applied Physics Y1 - 2024 U6 - https://doi.org/10.1088/1361-6463/ad67ea VL - 57 IS - 43 SP - 10 ER - TY - GEN A1 - Eisenhauer, Nico A1 - Frank, Karin A1 - Weigelt, Alexandra A1 - Bartkowski, Bartosz A1 - Beugnon, Rémy A1 - Liebal, Katja A1 - Mahecha, Miguel A1 - Quaas, Martin A1 - Al‐Halbouni, Djamil A1 - Bastos, Ana A1 - Bohn, Friedrich J. A1 - Brito, Mariana Madruga de A1 - Denzler, Joachim A1 - Feilhauer, Hannes A1 - Fischer, Rico A1 - Fritsche, Immo A1 - Guimaraes‐Steinicke, Claudia A1 - Hänsel, Martin A1 - Haun, Daniel B. M. A1 - Herrmann, Hartmut A1 - Huth, Andreas A1 - Kalesse‐Los, Heike A1 - Koetter, Michael A1 - Kolleck, Nina A1 - Krause, Melanie A1 - Kretschmer, Marlene A1 - Leitão, Pedro J. A1 - Masson, Torsten A1 - Mora, Karin A1 - Müller, Birgit A1 - Peng, Jian A1 - Pöhlker, Mira L. A1 - Ratzke, Leonie A1 - Reichstein, Markus A1 - Richter, Solveig A1 - Rüger, Nadja A1 - Sánchez‐Parra, Beatriz A1 - Shadaydeh, Maha A1 - Sippel, Sebastian A1 - Tegen, Ina A1 - Thrän, Daniela A1 - Umlauft, Josefine A1 - Wendisch, Manfred A1 - Wolf, Kevin A1 - Wirth, Christian A1 - Zacher, Hannes A1 - Zaehle, Sönke A1 - Quaas, Johannes T1 - A belowground perspective on the nexus between biodiversity change, climate change, and human well‐being T2 - Journal of Sustainable Agriculture and Environment N2 - Soil is central to the complex interplay among biodiversity, climate, and society. This paper examines the interconnectedness of soil biodiversity, climate change, and societal impacts, emphasizing the urgent need for integrated solutions. Human‐induced biodiversity loss and climate change intensify environmental degradation, threatening human well‐being. Soils, rich in biodiversity and vital for ecosystem function regulation, are highly vulnerable to these pressures, affecting nutrient cycling, soil fertility, and resilience. Soil also crucially regulates climate, influencing energy, water cycles, and carbon storage. Yet, climate change poses significant challenges to soil health and carbon dynamics, amplifying global warming. Integrated approaches are essential, including sustainable land management, policy interventions, technological innovations, and societal engagement. Practices like agroforestry and organic farming improve soil health and mitigate climate impacts. Effective policies and governance are crucial for promoting sustainable practices and soil conservation. Recent technologies aid in monitoring soil biodiversity and implementing sustainable land management. Societal engagement, through education and collective action, is vital for environmental stewardship. By prioritizing interdisciplinary research and addressing key frontiers, scientists can advance understanding of the soil biodiversity–climate change–society nexus, informing strategies for environmental sustainability and social equity. Y1 - 2024 U6 - https://doi.org/10.1002/sae2.12108 SN - 2767-035X VL - 3 IS - 2 PB - Wiley ER - TY - GEN A1 - Berkmann, Fritz A1 - Steuer, Oliver A1 - Ganss, Fabian A1 - Prucnal, Slawomir A1 - Schwarz, Daniel A1 - Fischer, Inga Anita A1 - Schulze, Jörg T1 - Sharp MIR plasmonic modes in gratings made of heavily doped pulsed laser-melted Ge1-xSnx T2 - Optical Materials Express Y1 - 2023 U6 - https://doi.org/10.1364/OME.479637 SN - 2159-3930 VL - 13 IS - 3 SP - 752 EP - 763 ER - TY - GEN A1 - Majed, Jihed Ben A1 - Schacht, Ralph A1 - Fischer, Tim A1 - Zajaczkowski, Marek A1 - May, Daniel A1 - Pareek, Kaushal Arun A1 - Zafar, Syed Ali T1 - Anwendung der Lock-in-Thermographie zur Defekterkennung in additiv gefertigten AMC Schweißnähten T2 - DGZfP 2025 : DGZfP-Jahrestagung 2025, 26.-28. Mai 2025 in Berlin N2 - Additiv gefertigte Aluminium-Matrix-Composite (AMC)-Materialien bieten durch ihr geringes Gewicht und ihre hohe Festigkeit signifikante Vorteile, führen aber während des Schweißvorgangs zu Porenbildung die die Festigkeit beeinflussen. Im Rahmen der Förderbekanntmachung „WIR! – Wandel durch Innovation in der Region“ des Bundesministeriums für Bildung und Forschung (BMBF) wird im Teilvorhaben „Inline-Prozesskettenentwicklung zum Reparieren von AMC-Werkstoffen sowie Porendetektion mittels aktiver IR-Thermographie zur Prozessüberwachung“ eine Machbarkeitsstudie zur Nutzung der Lock-in-Thermographie (LIT) zur Defekterkennung in AMC-Schweißnähten durchgeführt. Ziel der Machbarkeitsstudie ist es, die Anwendbarkeit der LIT für die Inline-Prozessüberwachung dieses Werkstoffs zu bewerten, da dessen thermische und mechanische Eigenschaften, darunter eine thermische Diffusivität von etwa 8,6 * 1E-5 m²/s, besondere Herausforderungen für die zerstörungsfreie Prüfung (ZfP) darstellen. Die LIT, bei der eine modulierte Wärmequelle verwendet wird, erlaubt die Erkennung von ‚subsurface‘ Defekten durch die Analyse der thermischen Wellen. Es werden verschiedene Algorithmen eingesetzt, um die thermischen Daten zu analysieren und die thermische Empfindlichkeit der verwendeten Kamera zu simulieren. Neben den experimentellen Untersuchungen werden FEM-Simulationen genutzt, um optimale Betriebsparameter wie Modulationsfrequenz und notwendige Laserleistung zu bestimmen. So konnten bereits zuverlässig Defekte ab 2 mm Größe bis zu 1,5 mm Tiefe unter der Oberfläche detektiert werden. Die FE-Simulationsergebnisse zeigen zudem, dass durch Anpassungen der Anregungsfrequenz sowie weiterer Parameter wie Energieeintrag, Kamerasensitivität und Auswertemethoden auch kleinere, tiefer liegende Defekte erkannt werden können. Die ersten Ergebnisse zeigen, dass die LIT auch für additiv gefertigte Metalllegierungen für die präzise Identifizierung verborgener Defekte einsetzbar ist und somit In-line zur Steigerung der Produktionssicherheit sowie der Produktqualität beitragen. KW - Zerstörungsfreie Prüfung KW - Lock-in-Thermographie KW - Defekterkennung KW - Aluminium-Matrix- Verbundwerkstoffe (AMC)-Schweißnaht KW - Numerische Simulation Y1 - 2025 U6 - https://doi.org/https://doi.org/10.58286/31221 SP - 1 EP - 10 PB - DGZfP CY - Berlin ER -