TY - CHAP A1 - Guido, Kramann T1 - AOGscript, Generative Code as Conceptual Artwork: Giving Space to Astonishment. Proceedings of xCoAx 2023 T2 - Konferenz: xCoAx 2023 11th Conference on Computation, Communication, Aesthetics & X Y1 - 2023 UR - https://2023.xcoax.org/xcoax2023.pdf SN - 978-989-9049-52-9 U6 - https://doi.org/10.34626/xcoax.2023 SP - 401 EP - 408 PB - i2ADS CY - Porto, Portugal ER - TY - JOUR A1 - Mikhailov, Ivan Igorevich A1 - Lamkin, I. A. A1 - Degterev, Aleksandr A1 - Degtereva, Mariya A1 - Pavlova, Marina A1 - Kurachkina, Marharyta A1 - Tarasov, S. A. A1 - Kuzmina, Ulyana T1 - Фоточувствительные структуры с каскадными концентраторами излучения на основе коллоидных квантовых точек халькогенидов металлов JF - Journal of the Russian Universities Radioelectronics N2 - The problem of increasing the efficiency of existing photodetectors and creating their new types attracts much research attention. Among new photodetector types are photosensitive structures based on cascade concentrators, whose operational principle involves the absorption of optical radiation followed by its reemission at a longer wavelength and radiation concentration onto a highly efficient small-area photodetector. The absorption and re-emission spectra of each cascade layer depend on the characteristics of the material used. Сolloidal quantum dots are among the most promising materials for cascade layers due to their manufacturing technology, which provides for accurate control over the photoluminescence maximum position. It seems highly relevant to develop and to study photosensitive structures with cascade concentrators of various shapes based on CdS, CdSe/ZnS, and PbS colloidal quantum dots. Aim . To develop photosensitive structures with a wide-range sensitivity spectrum based on concentrators containing arrays of metal chalcogenide CQDs and to study their characteristics. Materials and methods . Cascade photosensitive structures were manufactured based on layers made of polymethyl methacrylate and layers of colloidal quantum dots embedded in a polystyrene matrix. Results . Three-layer concentrators were manufactured with different colloidal quantum dots in each concentrator layers. A 22 % increase in the output power was observed for a three-layer cascade structure based on different cascade layer materials compared to a similar structure using a single layer concentrator. Conclusion . The conducted studies showed an increase in the efficiency of photosensitive structures with a cascade concentrator based on colloidal quantum dots of various types (CdS, CdSe/ZnS, and PbS) in the cascade layers. T2 - Photo-sensitive Structures with Cascade Radiation Concentrators Based on Colloidal Quantum Dots of Metal Chalcogenides Y1 - 2023 U6 - https://doi.org/10.32603/1993-8985-2023-26-2-78-88 SN - 2658-4794 VL - 26 IS - 2 SP - 78 EP - 88 PB - Saint Petersburg Electrotechnical University ER - TY - JOUR A1 - Vollmer, Michael T1 - So weit das Auge trägt JF - Physik in unserer Zeit N2 - Sichtweiten in der Atmosphäre reichen von wenigen Metern im Nebel bis zu einigen hundert Kilometern bei extrem guten Fernsichtbedingungen. Die zugrundeliegende Physik geht vom Wahrnehmungskontrast aus. Dieser ändert sich mit der Entfernung entlang der Sichtlinie zwischen Objekt und Auge aufgrund von Lichtstreuung und Absorption an den Bestandteilen der Atmosphäre. Dazu kommt bei der Fernsicht die Refraktion, die es erlaubt, auch über den durch die Kugelform der Erde geometrisch bedingten Horizont hinaus zu sehen. Y1 - 2023 UR - https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/piuz.202301675 U6 - https://doi.org/10.1002/piuz.202301675 SN - 1521-3943 VL - 54 IS - 5 SP - 222 EP - 230 PB - Wiley ER - TY - RPRT A1 - Goecke, Sven-Frithjof A1 - Müller, Alexander A1 - Ebert-Spiegel, Michael T1 - ECOWELD - Energiegeregeltes Metallschutzgas- und Laserschweißen : "Ingenieurnachwuchs" 2011 (Maschinenbau) : Ausschreibung der Förderlinie "Qualifizierung von Ingenieurnachwuchs an Fachhochschulen" 2011 im Rahmen des Programms "Forschung an Fachhochschulen" : Schlussbericht : Laufzeit des Vorhabens von: 01.08.2011 bis: 31.03.2015 Y1 - 2015 U6 - https://doi.org/10.2314/GBV:867121742 ER - TY - CHAP A1 - Schmidt, Marc-Peter A1 - Oseev, Aleksandr A1 - Engel, C. A1 - Brose, Andreas A1 - Aman, Alexander A1 - Hirsch, Sören T1 - A Novel Design and Fabrication of Multichannel Microfluidic Impedance Spectroscopy Sensor for Intensive Electromagnetic Environment Application T2 - Konferenz: The 28th European Conference on Solid-State Transducers (EUROSENSORS)/ Titel: Procedia Engineering 2014 Y1 - 2014 UR - https://linkinghub.elsevier.com/retrieve/pii/S187770581402387X U6 - https://doi.org/10.1016/j.proeng.2014.11.272 IS - 87 SP - 88 EP - 91 PB - Elsevier CY - Brescia, Italy ER - TY - CHAP A1 - Schmidt, Marc-Peter A1 - Oseev, Alexander A1 - Engel, C. A1 - Brose, Andreas A1 - Hirsch, Sören T1 - IMPEDANCE SPECTROSCOPY MICROFLUIDIC MULTICHANNEL SENSOR PLATFORM FOR LIQUID ANALYSIS T2 - Konferenz: International Conference on Miniaturized Systems for Chemistry and Life Sciences/ Titel: 18th International Conference on Miniaturized Systems for Chemistry and Life Sciences : (MicroTAS 2014); San Antonio, Texas, USA, 26 - 30 October 2014 / [CBMS] ; Vol. 4 Y1 - 2014 UR - http://rgdoi.net/10.13140/2.1.4254.8004 SN - 978-1-63439-697-4 U6 - https://doi.org/10.13140/2.1.4254.8004 IS - 4 SP - 1957 EP - 2577 PB - Curran CY - Red Hook, NY ER - TY - JOUR A1 - Schmidt, Marc-Peter A1 - Aman, Alexander A1 - Majcherek, Sören A1 - Hirsch, Sören T1 - Microwave Sensor for Mechanical Stress Measurement Based on Ferroelectric Graphene Nanosheet Composites JF - Procedia Engineering Y1 - 2014 UR - https://linkinghub.elsevier.com/retrieve/pii/S1877705814025144 U6 - https://doi.org/10.1016/j.proeng.2014.11.399 SN - 18777058 SP - 124 EP - 127 PB - Elsevier ER - TY - JOUR A1 - Aman, A. A1 - Majcherek, Soeren A1 - Schmidt, M. P. A1 - Orseev, A. A1 - Engel, C. A1 - Hirsch, Sören T1 - Behavior of Current Flow on Lead Zirconate Titanate Surfaces during Mechanical Impact JF - Research & Reviews: Journal of Material Sciences Y1 - 2016 UR - http://www.rroij.com/open-access/behavior-of-current-flow-on-lead-zirconate-titanate-surfacesduring-mechanical-impact-.php?aid=69107 U6 - https://doi.org/10.4172/2321-6212.1000137 SN - 23216212 IS - Ausgabe: 1/ Band: 4 PB - Research and Reviews ER - TY - CHAP A1 - Schmidt, Marc-Peter A1 - Oseev, Aleksandr A1 - Lucklum, Ralf A1 - Hirsch, Sören ED - Sánchez-Rojas, José Luis ED - Brama, Riccardo T1 - Technology towards a SAW based phononic crystal sensor T2 - Konferenz: SPIE Microtechnologies, Barcelona, Spain, 2015/ Titel: PROCEEDINGS VOLUME 9517 SPIE MICROTECHNOLOGIES | 4-6 MAY 2015 Smart Sensors, Actuators, and MEMS VII; and Cyber Physical Systems Y1 - 2015 UR - http://proceedings.spiedigitallibrary.org/proceeding.aspx?doi=10.1117/12.2178810 U6 - https://doi.org/10.1117/12.2178810 ER - TY - CHAP A1 - Oseev, Aleksandr A1 - Schmidt, Marc-Peter A1 - Lucklum, Ralf A1 - Zubtsov, Mikhail A1 - Hirsch, Sören T1 - Phononic crystal based liquid sensor governed by localized defect resonances T2 - Konferenz: IEEE Symposium (IUS) Ultrasonics, 2015/ Titel: 2015 IEEE International Ultrasonics Symposium (IUS) Y1 - 2015 UR - http://ieeexplore.ieee.org/document/7329492/ SN - 978-1-4799-8182-3 U6 - https://doi.org/10.1109/ULTSYM.2015.0053 SP - 1 EP - 4 PB - IEEE CY - Taipei, Taiwan ER - TY - CHAP A1 - Schmidt, Marc-Peter A1 - Oseev, Aleksandr A1 - Engel, Christian A1 - Brose, Andreas A1 - Hirsch, Sören T1 - A7.1 - Flexible free-standing SU-8 microfluidic impendance spectroscopy sensor for 3D molded interconnect devices application T2 - Konferenz: AMA Conferences 2015/ Titel: Proceedings SENSOR 2015 Y1 - 2015 UR - http://www.ama-science.org/doi/10.5162/sensor2015/A7.1 SN - 978-3-9813484-8-4 U6 - https://doi.org/10.5162/sensor2015/A7.1 SP - 151 EP - 155 PB - AMA Service GmbH CY - Nürnberg, Germany ER - TY - JOUR A1 - Aman, Alexander A1 - Majcherek, Soeren A1 - Hirsch, Sören T1 - Microwave Emission of Carbon Fibres During Electrical Breakdown JF - Sensor Letters Y1 - 2015 UR - http://openurl.ingenta.com/content/xref?genre=article&issn=1546-198X&volume=13&issue=1&spage=98 U6 - https://doi.org/10.1166/sl.2015.3408 SN - 1546198X, 15461971 IS - Ausgabe: 1/ Heft: 13 SP - 98 EP - 101 PB - American Scientific Publishers ER - TY - CHAP A1 - Brämer, Stefan A1 - Vieback, Linda A1 - Schiller, Gregor A1 - Hirsch, Sören T1 - Situiertes Lernen in der dualen Berufsausbildung. Entwicklung eines Lehr-Lern-Arrangements für den Ausbildungsinhalt „Sicherheit und Gesundheitsschutz bei der Arbeit“ T2 - Konferenz: 61. GfA-Frühjahrskongress, 2015/ Titel: Verantwortung für die Arbeit der Zukunft 61. GfA-Frühjahrskongress, 25. - 27.02.2015, Karlsruhe Y1 - 2015 SN - 978-3-936804-18-8 PB - GfA-Press CY - Dortmund ER - TY - JOUR A1 - Majcherek, Soeren A1 - Aman, A. A1 - Hirsch, Sören A1 - Schmidt, B. T1 - Silicon based in-situ measurement system for flex loads on MLCCs in PCB manufacturing chain JF - Sensors and Actuators A: Physical Y1 - 2015 UR - https://linkinghub.elsevier.com/retrieve/pii/S092442471530025X U6 - https://doi.org/10.1016/j.sna.2015.06.005 SN - 09244247 IS - 233 SP - 267 EP - 274 PB - Elsevier ER - TY - CHAP A1 - Revina, Aleksandra A1 - Kalabina, Elena A1 - Belyak, Olga T1 - Employee Engagement and Soft Skills in the Digitalization of the Economy. Preliminary Study Results T2 - Kumar, V., Kyriakopoulos, G.L., Akberdina, V., Kuzmin, E. (eds) Digital Transformation in Industry . DTI 2022. Lecture Notes in Information Systems and Organisation, vol 61. Springer, Cham N2 - The fast-paced digitalization and automation make hard skills acquired by employees in their academic study programs outdated and irrelevant very fast. Hence, researchers and practitioners have recently demonstrated a growing interest in studying soft skills in various settings, including leadership, education, and training. Additionally, in times of digital transformation, businesses are promoting employee engagement evermore, particularly in the present context of crises and instability. The research intends to investigate this issue from the viewpoint of employee soft skills. We specifically look into the link between employees’ soft skills and workplace engagement. While doing our research in two different countries, we distinguish between commercial and non-commercial organizations as well as add an international perspective. Based on an acknowledged European skills framework, we focus our study on such soft skills as teamwork, communication, and conflict management and use recognized surveys to quantify them. We use a well-known Gallup methodology to evaluate employee engagement. Using correlation analysis, we investigate the impact of the three selected skills on employee engagement while considering the organization type and country, factors that may play an important role in the digital transformation of businesses and companies. Y1 - 2023 U6 - https://doi.org/10.1007/978-3-031-30351-7_34 SP - 467 EP - 479 PB - Springer ER - TY - CHAP A1 - Markgraf, Klaus A1 - Dietrich, Benjamin A1 - Müller, Katja A1 - Flassig, Robert A1 - Flassig, Peter T1 - FINEconcepts - Wissenstransfer und Energiesystemoptimierung mithilfe des digitalen Zwillings T2 - NWK, HS Harz, 2023 N2 - Climate change, but also geopolitical circumstances, are moving topics such as energy efficiency and renewable energies more and more into the focus of the population, economy , and politics. As a result, the will to optimize new and existing energy systems extends from private individuals to companies and even entire communities. This work describes the development and usage of a new software called FINEconcepts which creates a digital twin of an energy system. This virtual model can then be used to optimize the energy system based on annual costs, CO2 emissions or other relevant criteria such as self-sufficiency. Because all system components, which include renewable technologies as well, can be added as a building block with chosen but changeable parameters, the software allows the user to explore and awaken interest and understanding of technologies that were previously considered too costly, irrelevant, or unrealistic. Implemented projects in small and large companies as well as in residential areas did prove, that the usage of FINEconcepts leads not only to more efficient energy systems by increasing the use of renewable energy, but also increased knowledge and understanding in terms of energy. Besides economics, ecology and security, understanding is an equally important factor in achieving a sustainable energy supply. Y1 - 2023 UR - https://www.hs-harz.de/dokumente/extern/Forschung/NWK2023/Beitraege/FINEconcepts_-_Wissenstransfer_und_Energiesystemoptimierung_mithilfe_des_digitalen_Zwillings.pdf SP - 428 EP - 435 PB - HS Harz ER - TY - JOUR A1 - Wang, Jing A1 - Harth, Kirsten A1 - Puzyrev, Dmitry A1 - Stannarius, Ralf T1 - The effect of obstacles near a silo outlet on the discharge of soft spheres JF - New Journal of Physics KW - fluid dynamics Y1 - 2022 U6 - https://doi.org/10.1088/1367-2630/ac8bea VL - 24 PB - IOP ER - TY - JOUR A1 - Missaoui, Amine A1 - Harth, Kirsten A1 - Trittel, Torsten A1 - Klopp, Christoph A1 - Stannarius, Ralf A1 - Lacaze, Emanuelle T1 - Shape instabilities of islands in smectic films under lateral compression JF - Soft Matter Y1 - 2022 U6 - https://doi.org/10.1039/D2SM00144F SN - 1744-6848 VL - 16 SP - 3193 EP - 3205 PB - Royal Society of Chemistry ER - TY - RPRT A1 - Kyba, Christopher C.M. A1 - Arroyo, Hector Linares A1 - Degen, Tobias A1 - Abascal, Angela A1 - Simoneau, Alexandre A1 - Kuffer, Monika A1 - Hölker, Franz A1 - Aubé, Martin A1 - Walczak, Ken A1 - Espey, Brian R. A1 - de Miguel, Alejandro Sánchez A1 - Jechow, Andreas A1 - Gyuk, Geza T1 - Night Watch Mission Description Document N2 - This is the Mission Description Document (MDD) for a future Earth observation satellite mission addressing visible band observations of nighttime lights. The mission driving science applications are for the remote sensing of electricity, energy, and ecological impacts via the observation of artificial light. The MDD covers the mission requirements justification from the high-level scientific objectives and societal benefits to measurement requirements at product level 1b, i.e. radiances at the top of the atmosphere. In providing justification for the individual requirements and their traceability to scientific objectives and societal challenges, we address Scientific Readiness Levels 1 to 3. The MDD is the outcome of the European Space Agency New Earth Observation Mission Ideas project "Night Watch". The Task Reports (TR) from the project are appended to the MDD, and are authored by the same group as the MDD itself. Y1 - 2024 U6 - https://doi.org/10.48440/gfz.b103-24052 SP - 1 EP - 156 PB - GFZ German Research Centre for Geosciences CY - Potsdam ER - TY - GEN A1 - Das, Atanu A1 - Chaurasia, Prashtan Kumar A1 - Mandal, Gopi K. A1 - Goecke, Sven-Frithjof A1 - De, Amitava T1 - Sample calculations to estimate joint distortion based on the published article "Analytical Estimation of Thermomechanical Distortion and Interface Layer Thickness for Gas Metal Arc Lap Joining of Dissimilar Sheets" N2 - A sample set of calculations is presented in this supplemental document to analytically estimate joint distortion for gas metal arc lap joining of aluminum and steel thin sheets following the published article "Analytical Estimation of Thermomechanical Distortion and Interface Layer Thickness for Gas Metal Arc Lap Joining of Dissimilar Sheets" Y1 - 2023 ER - TY - JOUR A1 - Das, Atanu A1 - Chaurasia, Prashtan Kumar A1 - Mandal, Gopi K. A1 - Goecke, Sven-Frithjof A1 - De, Amitava T1 - Analytical estimation of thermomechanical distortion and interface layer thickness for gas metal arc lap joining of dissimilar sheets JF - Welding in the World Y1 - 2023 U6 - https://doi.org/10.1007/s40194-01426-x SN - 432288 IS - 76/2023 SP - 33 EP - 49 PB - Springer Link ER - TY - JOUR A1 - Das, Atanu A1 - Goecke, Sven-Frithjof A1 - De, Amitava T1 - Joining of aluminium alloy and galvanized steel sheets multimaterial assembly using a gas metal arc based process JF - Tecnologia em Matalurgia, Materiais e Mineração Y1 - 2021 U6 - https://doi.org/10.4322/2176-1523.20212464 SN - 2176-1515 (PRINT) 2176-1523 (ONLINE) N1 - Band: 18 PB - ABM - Associação Brasileira de Metalurgia, Materiais e Mineração ER - TY - JOUR A1 - Chaurasia, Prashtan Kumar A1 - Goecke, Sven-Frithjof A1 - De, Amitava T1 - Real-time monitoring of temperature field, metal transfer and cooling rate during gas metal arc-directed energy deposition JF - Science and Technology of Welding and Joining Y1 - 2022 U6 - https://doi.org/10.1080/13621718.2022.2080447 SN - 13621718 IS - 27 SP - 512 EP - 521 PB - Taylor & Francis ER - TY - JOUR A1 - Goecke, Sven-Frithjof A1 - Makwana, Pinaac A1 - Shome, Mahadev A1 - De, Amitava T1 - Probing joint strength and distortion in gas metal arc lap joining of aluminum and steel sheets JF - Welding in the World Y1 - 2019 U6 - https://doi.org/10.1007/s40194-018-0653-z VL - 63 IS - 2 SP - 229 EP - 236 PB - Springer ER - TY - CHAP A1 - Goecke, Sven-Frithjof A1 - Seefeld, T. A1 - Tyralla, Dieter A1 - Krug, A. T1 - Monitoring and Control of the Heat Input in MAG-Laser-Hybrid Welding of High Strength Steel in Telescopic Crane Booms T2 - Konferenz: IEEE International Conference on Automation Science and Engineering (CASE), 2019/ Titel: 2019 IEEE 15th International Conference on Automation Science and Engineering (CASE): August 22-26, 2019, Vancouver, BC, Canada Y1 - 2019 SN - 978-1-72810-355-6 U6 - https://doi.org/10.1109/COASE.2019.8843219 PB - IEEE CY - Piscataway, New Jersey ER - TY - JOUR A1 - Makwana, Pinaac A1 - Goecke, Sven-Frithjof A1 - De, Amitava T1 - Real-time heat input monitoring towards robust GMA brazing JF - Science and Technology of Welding & Joining Y1 - 2019 U6 - https://doi.org/10.1080/13621718.2018.1470290 VL - 24 IS - 1 SP - 1 EP - 11 PB - Taylor & Francis ER - TY - JOUR A1 - Kuznetsov, Arthur A1 - Frorip, Aleksandr A1 - Sünter, Alar A1 - Kasvand, Nensi A1 - Korsakov, Vadim A1 - Konoplev, Georgii A1 - Stepanova, Oksana A1 - Rusalepp, Linda A1 - Anton, Dea A1 - Püssa, Tõnu A1 - Roasto, Mati A1 - Abramova, Liubov A1 - Kozin, Andrey A1 - Toom, Lauri A1 - Hirsch, Sören A1 - Mukhin, Nikolay ED - mdpi, T1 - Fast Protein and Metabolites (Nucleotides and Nucleosides) Liquid Chromatography Technique and Chemical Sensor for the Assessment of Fish and Meat Freshness JF - Chemosensors N2 - Fast protein and metabolite liquid chromatography (FPLMC) was introduced years ago to enable the easy separation of high-molecular compounds such as proteins from small molecules and the identification of the low-molecular substances. In this paper, the method is applied for the rapid evaluation of freshness and monitoring the aging of animal meat and fish. A novel chromatographic sensor was developed with a deep UV LED-based photometric detection unit (255–265 nm), an original flow cuvette and registration scheme; the processing of a chromatogram with the sensor takes approximately 15 min. Strict isochronism between the elution of ATP metabolites, mainly hypoxanthine (Hx) and inosine monophosphate (IMP), and the time of maturation of meat or fish, was discovered. A new freshness index H* = [Hx]/[IMP] was introduced, which is proportional to the instrumental delay time in the FPMLC chromatograms: the H* index < 0.5 indicates the presence of inosine monophosphate (IMP) and the high quality of the meat or fish. Reasonably strong correlations were revealed between data obtained by FPMLC and total volatile basic nitrogen TVB-N (for fish) or volatile fatty acids VFA (for meat) content. Moreover, putative nucleotide salvage and an increase in the concentration of IMP were observed in fish after heat treatment using the FPMLC sensor and NMR technique. Y1 - 2023 UR - https://www.mdpi.com/2227-9040/11/1/69 U6 - https://doi.org/10.3390/chemosensors11010069 SN - 2227-9040 IS - 1/2023 / Band 11 PB - MDPI ER - TY - JOUR A1 - Kuznetsov, Artur A1 - Frorip, Aleksandr A1 - Sünter, Alar A1 - Korsakov, Vadim A1 - Konoplev, Georgii A1 - Stepanova, Oksana A1 - Roschina, Natalia A1 - Ovsyannikov, Nikolay A1 - Lialin, Daniil A1 - Gerasimchuk, Roman A1 - Dmitriev, Alexander A1 - Mukhin, Nikolay A1 - Hirsch, Sören T1 - Optical Chemical Sensor Based on Fast-Protein Liquid Chromatography for Regular Peritoneal Protein Loss Assessment in End-Stage Renal Disease Patients on Continuous Ambulatory Peritoneal Dialysis JF - Chemosensors KW - optical chemical sensor KW - fast-protein liquid chromatography KW - UV LED KW - end-stage renal disease KW - peritoneal dialysis KW - peritoneal protein loss KW - albumin KW - point-of-care diagnostic devices Y1 - 2022 U6 - https://doi.org/10.3390/chemosensors10060232 VL - 10 IS - 6 PB - MDPI ER - TY - JOUR A1 - Konoplev, Georgii A1 - Agafonova, Darina A1 - Bakhchova, Liubov A1 - Mukhin, Nikolay A1 - Kurachkina, Marharyta A1 - Schmidt, Marc-Peter A1 - Verlov, Nikolay A1 - Sidorov, Alexander A1 - Oseev, Aleksandr A1 - Stepanova, Oksana A1 - Kozyrev, Andrey A1 - Dmitriev, Alexander A1 - Hirsch, Sören T1 - Label-Free Physical Techniques and Methodologies for Proteins Detection in Microfluidic Biosensor Structures JF - Biomedicines KW - label-free biosensor KW - microfluidics KW - proteins detection KW - optical biosensors KW - impedance spectroscopy KW - plasmon resonance KW - point-of-care KW - diagnostic devices Y1 - 2022 U6 - https://doi.org/10.3390/biomedicines10020207 SN - 2227-9059 VL - 10 IS - 2 SP - 207 PB - MDPI ER - TY - JOUR A1 - Koldeweij, Robin B. J. A1 - Kant, Pallav A1 - Harth, Kirsten A1 - Ruiter, Rielle de A1 - Gelderblom, Hanneke A1 - Snoeijer, Jacco H. A1 - Lohse, Detlef A1 - Limbeek, Michiel A. J. van T1 - Initial solidification dynamics of spreading droplets JF - Physical Review Fluids N2 - When a droplet is brought in contact with an undercooled surface, it wets the substrate and solidifies at the same time. The interplay between the phase transition effects and the contact-line motion, leading to its arrest, remains poorly understood. Here we reveal the early solidification patterns and dynamics of spreading hexadecane droplets. Total internal reflection imaging is employed to temporally and spatially resolve the early solidification behavior. With this, we determine the conditions leading to the contact-line arrest. We quantify the overall nucleation behavior, i.e., the nucleation rate and the crystal growth speed and show its sensitivity to the applied undercooling of the substrate. We also show that for strong enough undercooling it is the rapid growth of the crystals which determines the eventual arrest of the spreading contact line. By combining the Johnson-Mehl-Avrami-Kolmogorov nucleation theory and scaling relations for the spreading, we calculate the temporal evolution of the solid area fraction, which is in good agreement with our observations. Y1 - 2021 UR - https://link.aps.org/doi/10.1103/PhysRevFluids.6.L121601 U6 - https://doi.org/10.1103/PhysRevFluids.6.L121601 SN - 2469-990X IS - 12 PB - American Physical Society ER - TY - JOUR A1 - Stannarius, Ralf A1 - Harth, Kirsten T1 - The structure of disintegrating defect clusters in smectic C freely suspended films JF - Soft Matter N2 - Disclinations or disclination clusters in smectic C freely suspended films with topological charges larger than one are unstable. They disintegrate, preferably in a spatially symmetric fashion, into single defects with individual charges of +1, which is the smallest positive topological charge allowed in polar vector fields. While the opposite process of defect annihilation is well-defined by the initial defect positions, disintegration starts from a singular state and the following scenario including the emerging regular defect patterns must be selected by specific mechanisms. We analyze experimental data and compare them with a simple model where the defect clusters adiabatically pass quasi-equilibrium solutions in one-constant approximation. It is found that the defects arrange in geometrical patterns that correspond very closely to superimposed singular defect solutions, without additional director distortions. The patterns expand by affine transformations where all distances between individual defects scale with the same time-dependent scaling factor proportional to the square-root of time. Y1 - 2023 UR - https://pubs.rsc.org/en/content/articlelanding/2023/sm/d3sm00808h U6 - https://doi.org/https://doi.org/10.1039/d3sm00808h IS - 19 SP - 6109 EP - 6115 PB - Royal Society of Chemistry ER - TY - JOUR A1 - Klopp, Christoph A1 - Trittel, Torsten A1 - Harth, Kirsten A1 - Stannarius, Ralf T1 - Coalescence of biphasic droplets embedded in free standing smectic A films JF - Soft Matter N2 - We investigate micrometer-sized flat droplets consisting of an isotropic core surrounded by a nematic rim in freely suspended smectic A liquid-crystal films. In contrast to purely isotropic droplets which are characterized by a sharp edge and no long-range interactions, the nematic fringe introduces a continuous film thickness change resulting in long-range mutual attraction of droplets. The coalescence scenario is divided in two phases. The first one consists in the fusion of the nematic regions. The second phase involves the dissolution of a thin nematic film between the two isotropic cores. The latter has many similarities with the rupture of thin liquid films between droplets coalescing in an immiscible viscous liquid. Coalescence of biphasic droplets in free-standing smectic films is controlled in part by the rupture of a thin nematic membrane separating the isotropic droplet cores. Y1 - 2023 UR - https://pubs.rsc.org/en/content/articlelanding/2024/sm/d3sm01549a U6 - https://doi.org/10.1039/d3sm01549a SN - 1744-683X VL - 20 IS - 5 SP - 1036 EP - 1046 PB - Royal Society of Chemistry ER - TY - JOUR A1 - Vogel, Sven A1 - Wölfer, Christian A1 - Ramirez-Diaz, Diego A1 - Flassig, Robert A1 - Sundmacher, Kai A1 - Schwille, Petra T1 - Symmetry Breaking and Emergence of Directional Flows in Minimal Actomyosin Cortices JF - Cells N2 - Cortical actomyosin flows, among other mechanisms, scale up spontaneous symmetry breaking and thus play pivotal roles in cell differentiation, division, and motility. According to many model systems, myosin motor-induced local contractions of initially isotropic actomyosin cortices are nucleation points for generating cortical flows. However, the positive feedback mechanisms by which spontaneous contractions can be amplified towards large-scale directed flows remain mostly speculative. To investigate such a process on spherical surfaces, we reconstituted and confined initially isotropic minimal actomyosin cortices to the interfaces of emulsion droplets. The presence of ATP leads to myosin-induced local contractions that self-organize and amplify into directed large-scale actomyosin flows. By combining our experiments with theory, we found that the feedback mechanism leading to a coordinated directional motion of actomyosin clusters can be described as asymmetric cluster vibrations, caused by intrinsic non-isotropic ATP consumption with spatial confinement. We identified fingerprints of vibrational states as the basis of directed motions by tracking individual actomyosin clusters. These vibrations may represent a generic key driver of directed actomyosin flows under spatial confinement in vitro and in living systems. Y1 - 2020 UR - https://www.mdpi.com/2073-4409/9/6/1432 U6 - https://doi.org/10.3390/cells9061432 SP - 1 EP - 10 PB - MDPI ER - TY - JOUR A1 - Goschin, Tobias A1 - Vogel, Mathias A1 - Flassig, Robert T1 - Energy Technologies For Decarbonizing The Steel Processing Industry – A Numerical Study JF - IFAC-PapersOnLine N2 - This study analyzes approaches to decarbonize the energy supply of the secondary steel processing industry. Therefore, real data from a secondary steel production company is used in combination with state-of-the art low carbon energy supply technologies. Also, the use of waste heat from a pusher furnace for process integration is considered. The developed temporal process model allows holistic optimizing and expanding the steel making process system regarding techno-economic criteria. As we show, implementing the annual heat demand of a municipality shows that a nearly 100 % self-sufficient heat supply is possible. Y1 - 2022 UR - https://linkinghub.elsevier.com/retrieve/pii/S240589632200386X U6 - https://doi.org/https://doi.org/10.1016/j.ifacol.2022.07.001 VL - 55 IS - 9 SP - 1 EP - 5 PB - Elsevier ER - TY - CHAP A1 - Vogel, Mathias A1 - Goschin, Tobias A1 - Flassig, Robert T1 - Techno-economic analysis of excess wind energy utilization in the energy supply of residential quarters T2 - Konferenz: Symposium on Control of Power and Energy Systems (CPES), 2022/ Konferenzband:11th IFAC Symposium on Control of Power and Energy Systems (CPES 2022) Y1 - 2022 U6 - https://doi.org/10.32479/ijeep.8067 PB - Elsevier ER - TY - JOUR A1 - Trittel, Torsten A1 - Klopp, Christoph A1 - Harth, Kirsten A1 - Stannarius, Ralf T1 - Stability and Rupture of Liquid Crystal Bridges under Microgravity JF - Crystals KW - smectic liquid-crystals KW - Rayleigh-Plateau instability KW - TEXUS suborbital rocket KW - microgravity Y1 - 2022 U6 - https://doi.org/https://doi.org/10.3390/cryst12081092 VL - 12 IS - 8 PB - MDPI ER - TY - BOOK A1 - Kraska, Martin T1 - Engineering Calculations with SMath BT - First Steps N2 - Introduction to SMath Studio covering the topics installation, configuration, creating text and formulas, scientific units, graphics, embedded images. The tutorial takes approximately 2 hours to complete. KW - SMath KW - Software Y1 - 2025 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:522-opus4-33709 PB - Technische Hochschule Brandenburg CY - Brandenburg an der Havel ER - TY - CHAP A1 - Sigwarth, Timo A1 - Löwe, Katharina A1 - Beck, Eberhard A1 - Pelchen, Lutz A1 - Schrader, Thomas T1 - Conceptual ontology of prospective risk analysis in medical environments - the OPT-Model-Ontology T2 - 2015 IEEE Seventh International Conference on Intelligent Computing and Information Systems (ICICIS'15) : Faculty of Commuter & Information Sciences, Ain Shams University, Cairo, Egypt, 12-14 Dec. 2015 Y1 - 2015 SN - 978-1-5090-1950-2 SN - 978-1-5090-1949-6 U6 - https://doi.org/10.1109/IntelCIS.2015.7397202 SP - 88 EP - 93 PB - IEEE CY - Piscataway, NJ ER - TY - CHAP A1 - Schrader, Thomas A1 - Löwe, Katharina A1 - Pelchen, Lutz A1 - Beck, Eberhard T1 - Prospective, knowledge based clinical risk analysis: The OPT-model T2 - 2015 IEEE Seventh International Conference on Intelligent Computing and Information Systems (ICICIS) : Faculty of Commuter & Information Sciences, Ain Shams University, Cairo, Egypt, 12-14 Dec. 2015 Y1 - 2015 SN - 978-1-5090-1950-2 SN - 978-1-5090-1949-6 U6 - https://doi.org/10.1109/IntelCIS.2015.7397204 SP - 94 EP - 99 PB - IEEE CY - Piscataway, NJ ER - TY - JOUR A1 - Schumann, Sophia A1 - Stoilova, Velizara A1 - Bortoletto, Enrico A1 - Piva, Elisabetta A1 - Pacchini, Sara A1 - Mozzi, Gloria A1 - Jechow, Andreas A1 - Marion, Andrea A1 - Bertotto, Daniela A1 - Erlandson, Ann A1 - Hölker, Franz A1 - Greenberg, Larry A1 - Santovito, Gianfranco T1 - Impact of artificial light at night (ALAN) on cardiac function and acute oxidative stress physiology in migratory brown trout smolts JF - Environmental Pollution N2 - Light pollution poses significant ecological challenges for nocturnal animals reliant on natural light for migration, orientation, and circadian rhythms. The physiological effects of abrupt exposure to artificial light at night (ALAN) on migratory fish, such as the light experienced passing near illuminated infrastructures, remain poorly understood. This study investigates the physiological responses of brown trout (Salmo trutta) smolts to low-intensity (0.02 lx) and short-term (30 s) ALAN, simulating nocturnal migration light conditions near illuminated bridges. To evaluate the influence of social dynamics, trout were tested individually (solitary) or in groups of six. Using continuous cardiac monitoring with data storage tags, alongside analyses of oxidative stress markers and adenylate kinase (AK) activity in the heart, we identified distinct patterns of physiological responses. Solitary fish exhibited significant heart rate variability (HRV) increases following repeated ALAN exposure, suggesting impaired physiological regulation under repeated ALAN exposure. In contrast, trout in groups displayed consistently lower HRV over the entire 90-min experiment, implying that social dynamics likely influenced a sustained oxidative stress response, corroborated by increased AK activity. Oxidative stress markers further reflected social effects, with significant upregulation of key antioxidant enzymes (sod1, sod2, gpx1, gpx4) and elevated lipid peroxidation, identifying lipids as primary oxidative targets. The observed divergence between superoxide dismutase (SOD) activity and sod gene expression suggests adaptive post-transcriptional regulation to maintain redox balance under combined environmental and social stress. These findings reveal that social dynamics under ALAN can amplify physiological stress, potentially affecting migratory outcomes. Y1 - 2025 U6 - https://doi.org/10.1016/j.envpol.2025.126593 IS - 381 SP - 1 EP - 9 PB - Elsevier ER - TY - JOUR A1 - Kalinkat, Gregor A1 - Jechow, Andreas A1 - Schroer, Sibylle A1 - Hölker, Franz T1 - Nocturnal pandas: conservation umbrellas protecting nocturnal biodiversity JF - Trends in Ecology & Evolution N2 - Light pollution is an emerging ecological threat. To mitigate its negative consequences, creative inter- and transdisciplinary solutions and societal interactions are needed. To this end, we introduce nocturnal umbrella species representative of light-sensitive biodiversity whose protection will safeguard vital ecosystem services and a wide range of co-occurring species. Y1 - 2025 U6 - https://doi.org/10.1016/j.tree.2025.05.006 VL - 40 IS - 8 SP - 736 EP - 739 PB - Elsevier ER - TY - CHAP A1 - Kersten, Philipp A1 - Buzin, Johannes A1 - Hirsch, Sören T1 - Wireless Sensor Nodes for Condition Based Maintenance in Railway Systems T2 - IEEE Sensors Conference, Kobe, Japan, 2024 N2 - Ensuring the reliability, safety, and efficiency of railway systems is increasingly critical in global transportation networks. This paper addresses the necessity for advanced monitoring systems by introducing a multivariate energy-efficient wireless sensor node designed for proactive maintenance in rail applications. Y1 - 2024 UR - https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10784508 U6 - https://doi.org/10.1109/SENSORS60989.2024.10784508 SP - 1 EP - 4 PB - IEEE ER - TY - JOUR A1 - Vollmer, Michael A1 - Eberhardt, Wolfgang T1 - Ein einfaches Modell für die Vorhersage von CO2 Konzentrationen in der Atmosphäre in Abhängigkeit von globalen CO2 Emissionen JF - PhyDid B, Didaktik der Physik, Beiträge zur DPG-Frühjahrstagung N2 - Es wird das vielleicht einfachst mögliche Modell vorgestellt, mit dem zeitabhängige CO2 Konzent-rationen c(t) in der Atmosphäre ausgehend von verschiedenen globalen Emissionsszenarien für CO2berechnet werden. Dazu wird eine einzelne inhomogene lineare Differenzialgleichung 1. Ordnung hergeleitet, deren Parameter sich aus den quantitativen Daten des global carbon project sowie Mauna Loa Daten für CO2 Konzentrationen errechnen. Das Modell wird erstens getestet am Zeitraum 1960 bis 2020 mit vergleichsweise guter quantitativer Übereinstimmung zu Messdaten. Zweitens wird für zwei typische IPCC Emissions-Szenarien ein Vergleich der Modellvorhersagen mit denen der kom-plexen IPCC Earth-System-Klimamodelle diskutiert mit qualitativer Übereinstimmung des zeitli-chen Verlaufs. Drittens werden Ergebnisse einiger ausgewählter neuer Emissionsszenarien präsen-tiert. Ungeachtet einiger Abweichungen zu komplexeren Klimamodellen zeichnet sich unser Mo-dell durch zwei wichtige Vorteile für die Lehre aus. Zum einen ist es sehr einfach für Studierende und begabte Schüler nutzbar, da die erforderliche Lösung der Differentialgleichung bereits mit han-delsüblicher Tabellenkalkulationssoftware wie z.B. Excel programmiert werden kann. Dadurch ge-stattet es zum anderen auch sehr einfach, den zeitlichen Verlauf von Emissionsszenarien zu verän-dern und innerhalb weniger Sekunden Veränderungen aufgrund geänderter Eingaben zu berechnen. Insofern eignet sich das Modell sehr gut als Einstieg in das Thema Klimamodellierung in einführen-den Hochschulvorlesungen zum Themenbereich Kohlenstoffkreislauf und Klimawandel. In der Schule kann es gegen Ende der Sekundarstufe 2 beispielsweise im Projektunterricht zum Themen-komplex Nachhaltigkeit in Physik und/oder Mathematik eingesetzt werden Y1 - 2024 UR - https://ojs.dpg-physik.de/index.php/phydid-b/article/view/1411 SN - 2191-379X VL - 1 IS - 1 SP - 379 EP - 388 PB - FU Berlin ER - TY - JOUR A1 - Vollmer, Michael A1 - Eberhardt, Wolfgang T1 - A simple model for the prediction of CO2 concentrations in the atmosphere, depending on global CO2 emissions JF - European Journal of Physics N2 - We present a very simple model for estimating time dependent atmospheric CO2 concentrations c(t) from global carbon emission scenarios, serving as single input data. We derive a single linear differential equation of 1st order, based on parameters which are estimated from quantitative data of the global carbon project and Mauna Loa data for CO2 concentrations. The model is tested first by comparing it to the 1960–2021 period with reasonably good quantitative agreement and, second to two of the typical current IPCC scenarios with good qualitative agreement. Finally, some new emission scenarios are modelled. Despite several drawbacks concerning absolute quantitative predictions, there are two important advantages of the model. First, it can be easily executed by students already with simple programmable spreadsheet programs such as Excel. Second input emission scenarios can be changed easily and expected changes are immediately seen for discussion during undergraduate and graduate courses on the carbon cycle and climate change. Y1 - 2024 U6 - https://doi.org/10.1088/1361-6404/ad230d VL - 45 IS - 2 ER - TY - JOUR A1 - Klopp, Christoph A1 - Trittel, Torsten A1 - Stannarius, Ralf T1 - Coarsening of quasi two-dimensional emulsions formed by islands in free-standing smectic films JF - ChemPhysChem N2 - We study the coarsening behavior of assemblies of islands on smectic A freely suspended films in ISS microgravity experiments. The islands can be regarded as liquid inclusions in a two-dimensional fluid in analogy to liquid droplets of the discontinuous phase of an emulsion. The coarsening is effectuated by two processes, predominantly by island coalescence, but to some extend also by Ostwald ripening, whereby large islands grow at the expense of surrounding smaller ones. A peculiarity of this system is that the continuous and the discontinuous phases consist of the same material. We determine the dynamics, analyze the self-similar aging of the island size distribution and discuss characteristic exponents of the mean island growth. Y1 - 2024 U6 - https://doi.org/10.1002/cphc.202400166 VL - 25 IS - 12 SP - 1 EP - 12 PB - Wiley ER - TY - JOUR A1 - Vollmer, Michael T1 - Limitations of the eye and how to overcome them JF - Journal of Physics: Conference Series N2 - Human eyes have spatial, temporal, and spectral limitations which impose constraints on our perception. With appropriate optical devices and cameras, the limitations can be easily overcome. As a consequence, a huge variety of physical phenomena can be made accessible for teaching. Y1 - 2024 U6 - https://doi.org/10.1088/1742-6596/2750/1/012001 VL - 2750 IS - 1 SP - 1 EP - 10 ER - TY - JOUR A1 - Arslan, Eda A1 - Brücher, Viktoria A1 - Demir, Gokce A1 - Liekfeld, Anja T1 - Gender distribution of scientific contributions at German ophthalmological conferences - a baseline study T1 - Geschlechterverteilung bei wissenschaftlichen Beiträgen auf deutschen ophthalmologischen Kongressen – eine Bestandsaufnahme JF - Die Ophthalmologie N2 - The proportion of female ophthalmologists in Germany has risen to approximately 50% in recent years, and approximately 66% of medical students are women. This represents a reversal of the past situation with a male predominance. Despite this change, many international studies show that women are still underrepresented at scientific conferences, particularly among invited speakers, chairpersons, and program committees. This study aims to investigate whether these differences in gender representation are also reflected at German ophthalmological congresses and whether the situation has changed in recent years. MethodsData collection covered the years 2013, 2022, and 2023 and included the congresses of the five large German ophthalmological associations: the German Ophthalmological Society (DOG), German Ophthalmic Surgical Society (DOC), German Ophthalmological Academy (AAD), German Society of Cataract and Refractive Surgery (DGII) and the German Retinological Society (RG). Data were collected based on online programs and information provided by the offices and the managing committees. The numbers of female and male speakers and chairpersons were identified, as were the gender distributions of the specific program committees. Overall, the percentage of female speakers across all years and conferences surveyed averaged 25%, while female chairs averaged 17%. The percentage of females in the program committees ranged from 0% to 17%. There was an increase in the percentage of female speakers over 10 years (2013-2023). For the DOG (ptrend < 0.01) and the DOC (ptrend = 0.01) there was a significant rise, while it was highest at the DOG (37%) and lowest at the DGII (11%). The percentage of female chairs was in general lower than the percentage of female speakers for all conferences (between 11% and 26% in 2023). Only for the DOG was there a statistically significant increase over the 10 years (ptrend < 0.01). The representation of women as speakers and chairpersons at German ophthalmology conferences is low; these continue to be predominantly male dominated. Although there has been an increase in female representation over time, it remains lower than the overall proportion of women in the profession in 2023. Significant differences are observed between the various ophthalmological conferences. Further investigation into the underrepresentation of women at these conferences is necessary, and measures to encourage greater female participation at congresses should be implemented. N2 - In den letzten Jahren hat sich das Geschlechterverhältnis in der Augenheilkunde in Deutschland verändert. Derzeit sind etwa 50 % der in diesem Fach tätigen Ärztinnen und Ärzte weiblich, und bei den Medizinstudierenden liegt der Frauenanteil sogar bei rund 66 %. Diese Entwicklung stellt eine Umkehr des bisherigen Geschlechterverhältnisses im Sinne einer stärkeren Repräsentation von Frauen dar. Trotz dieser Veränderung zeigen zahlreiche internationale Studien, dass Frauen auf wissenschaftlichen Kongressen weiterhin unterrepräsentiert sind. Dies gilt insbesondere für ihre Beteiligung als geladene Rednerinnen, Vorsitzende von Sitzungen sowie als Mitglieder von Programmkommissionen. Diese Diskrepanz wirft die Frage auf, ob ähnliche Ungleichgewichte auch in Deutschland bestehen. Bisher gibt es keine systematische Untersuchung, die geschlechtsspezifische Unterschiede in der Repräsentation von Vortragenden, Vorsitzenden und Mitgliedern der Programmkommissionen auf ophthalmologischen Kongressen in Deutschland beleuchtet. Ziel dieser Studie ist es, das Ausmaß dieses Geschlechterunterschieds in der deutschen Ophthalmologie auf Kongressen zu untersuchen. Y1 - 2024 U6 - https://doi.org/10.1007/s00347-024-02154-x SN - 2731-7218 VL - 122 SP - 100 EP - 106 PB - Springer ER - TY - JOUR A1 - Degen, Jacqueline A1 - Storms, Mona A1 - Lee, Benjamin A1 - Jechow, Andreas A1 - Stoeckl, Anna A1 - Hoelker, Franz A1 - Jakhar, Aryan A1 - Walter, Thomas A1 - Walter, Stefan A1 - Mitesser, Oliver A1 - Hovestadt, Thomas A1 - Degen, Tobias T1 - Shedding light with harmonic radar: Unveiling the hidden impacts of streetlights on moth flight behavior JF - Proceedings of the National Academy of Sciences of the United States of America N2 - One of the most dramatic changes occurring on our planet is the ever- increasing extensive use of artificial light at night, which drastically altered the environment to which nocturnal animals are adapted. Such light pollution has been identified as a driver in the dramatic insect decline of the past years. One nocturnal species group experiencing marked declines are moths, which play a key role in food webs and ecosystem services such as plant pollination. Moths can be easily monitored within the illuminated area of a streetlight, where they typically exhibit disoriented behavior. Yet, little is known about their behavior beyond the illuminated area. Harmonic radar tracking enabled us to close this knowledge gap. We found a significant change in flight behavior beyond the illuminated area of a streetlight. A detailed analysis of the recorded trajectories revealed a barrier effect of streetlights on lappet moths whenever the moon was not available as a natural celestial cue. Furthermore, streetlights increased the tortuosity of flights for both hawk moths and lappet moths. Surprisingly, we had to reject our fundamental hypothesis that most individuals would fly toward a streetlight. Instead, this was true for only 4% of the tested individuals, indicating that the impact of light pollution might be more severe than assumed to date. Our results provide experimental evidence for the fragmentation of landscapes by streetlights and demonstrate that light pollution affects movement patterns of moths beyond what was previously assumed, potentially affecting their reproductive success and hampering a vital ecosystem service. Y1 - 2024 U6 - https://doi.org/10.1073/pnas.2401215121 VL - 121 IS - 42 PB - National Academy of Sciences ER - TY - JOUR A1 - Strachan, Laura M. A1 - Winkel, Carmen T1 - Oral Histories of Social, Cultural, and Environmental Changes in Saudi Arabia Before and After Saudi Aramco JF - Social Change N2 - Saudi Aramco’s influence upon the Kingdom of Saudi Arabia cannot be overstated. After the discovery of oil in 1938, a nationwide metamorphosis began to infiltrate desert communities, sleepy fishing villages, and traditional urban centres ultimately influencing the people and their environments in unimaginable ways. Becoming one of the world’s largest oil producers has meant the loss and/or transformation of traditional ways of life. Shepherds, pearl divers, fishermen, and farmers are today’s business owners, executives, and international leaders. How could the development of a single company influence a country and its populace so dramatically? Besides the financial gains, how were individuals, families, and ecosystems affected? What were some of the personal challenges experienced by Saudi citizens? In this paper, the authors address these questions and others using local Saudi knowledge. In total, 20 female university students who participated in an oral history project interviewed their family members to learn how Saudi Aramco affected them personally, their traditions, landscapes, and society more generally. Excerpts from the interviews are highlighted to expose the nuances experienced by the various research participants. Y1 - 2024 U6 - https://doi.org/10.1177/00490857241278782 VL - 54 IS - 4 SP - 561 EP - 576 PB - Sage ER - TY - JOUR A1 - Puzyrev, Dmitry A1 - Torsten, Torsten A1 - Harth, Kirsten A1 - Stannarius, Ralf T1 - Cooling of a granular gas mixture in microgravity JF - npj microgravity N2 - Granular gases are fascinating non-equilibrium systems with interesting features such as spontaneous clustering and non-Gaussian velocity distributions. Mixtures of different components represent a much more natural composition than monodisperse ensembles but attracted comparably little attention so far. We present the observation and characterization of a mixture of rod-like particles with different sizes and masses in a drop tower experiment. Kinetic energy decay rates during granular cooling and collision rates were determined and Haff’s law for homogeneous granular cooling was confirmed. Thereby, energy equipartition between the mixture components and between individual degrees of freedom is violated. Heavier particles keep a slightly higher average kinetic energy than lighter ones. Experimental results are supported by numerical simulations. Y1 - 2024 U6 - https://doi.org/10.1038/s41526-024-00369-5 VL - 10 IS - 1 SP - 1 EP - 9 PB - Springer CY - Brandenburg an der Havel ER -