TY - GEN A1 - Hoppe, Sebastian A1 - Mißler-Behr, Magdalena A1 - Greiffenberg, Steffen T1 - Business Process Management - Konzepte, Einsatzszenarien und Perspektiven Y1 - 2010 ER - TY - GEN A1 - Merbold, Sebastian A1 - Fischer, Steffen A1 - Egbers, Christoph T1 - Torque scaling in Taylor-Couette-Flow - An experimental investigation Y1 - 2011 ER - TY - CHAP A1 - Merbold, Sebastian A1 - Fischer, Steffen A1 - Egbers, Christoph T1 - Turbulent Couette-Taylor flow - An experimental investigation of the angular momentum flux Y1 - 2011 ER - TY - GEN A1 - Hantelmann, Cord A1 - Fritzsche, Sebastian A1 - Michailov, Vesselin A1 - Boywitt, Ralf A1 - Risse, Steffen A1 - Pöge, Matthias A1 - Vogelsang, Jörg A1 - Cramer, Heidi T1 - Geschweißte Konstruktionen aus Aluminiumschaumsandwich T2 - Schweißen und Schneiden N2 - Im vorgestellten Projekt wurden werkstoff- und konstuktionsgerechte Knotenformen aus Aluminiumschaumsandwich (engl. Aluminium Foam Sandwich, AFS) gestaltet und mit unterschiedlichen Schweißverfahren wie dem Metall-Inertgasschweißen und dem Rührreibschweißen gefügt und geprüft. Im Rahmen der Arbeiten stand dabei die schweißtechnische Verarbeitung von AFS mit anderen Produkten, wie den Strangpressprofilen oder dem Aluminiumvollmaterial, und deren Beanspruchbarkeit im Vordergrund. In umfangreichen Untersuchungen wurden hierzu sowohl die Verbindugsknoten selbst als auch der Sandwichverbund und die Einzelkomponenten des Sandwich, Schaum und Decklagen, anhand der statischen Festigkeit und Schwingfestigkeit bewertet. Zusätzlich wurden innere Schädigungsmechanismen betrachtet. Mit experimentellen und numerischen Nachweismethoden konnte die anwendungssichere Knotengestaltung, -anbindung und -berechnung der unterschiedlichen Verbindungstypen umgesetzt werden. Die Ergebnisse wurden im Rahmen der Nachweisführung gegenübergestellt und hinsichtlich eines praxisgerechten Einsatzes nach FKM-Richtlinie bzw. Eurocode9 bewertet. Mit den ermittelten Ergebnissen wurde die bisherige Gestaltungs- und Fügerichtlinie um neue Verbindungstypen erweitert. KW - Festigkeit KW - Reibschweißen KW - Richtlinien KW - Schutzgasschweißen KW - Werkstofffragen KW - Werkstoffkombination Y1 - 2023 SN - 0036-7184 VL - 75 IS - 12 SP - 912 EP - 922 ER - TY - GEN A1 - Hantelmann, Cord A1 - Fritzsche, Sebastian A1 - Michailov, Vesselin A1 - Boywitt, Ralf A1 - Risse, Steffen A1 - Paulinus, Dietmar T1 - Einsatz von Aluminiumschaum-Sandwich-Bauteilen in Schweißkonstruktionen T2 - Schweissen und Scheiden Y1 - 2016 SN - 0036-7184 VL - 68 IS - 3 SP - 106 EP - 114 ER - TY - GEN A1 - Recupido, Federica A1 - Lama, Giuseppe Cesare A1 - Steffen, Sebastian A1 - Dreyer, Christian A1 - Seidlitz, Holger A1 - Russo, Vincenzo A1 - Lavorgna, Marino A1 - De Luca Bossa, Ferdinando A1 - Silvano, Selena A1 - Boggioni, Laura A1 - Verdolotti, Letizia T1 - Efficient recycling pathway of bio-based composite polyurethane foams via sustainable diamine T2 - Ecotoxicology and Environmental Safety N2 - Aminolysis is widely recognized as a valuable chemical route for depolymerizing polymeric materials containing ester, amide, or urethane functional groups, including polyurethane foams. Bio-based polyurethane foams, pristine and reinforced with 40 wt% of sustainable fillers, were depolymerized in the presence of bio-derived butane-1,4-diamine, BDA. A process comparison was made using fossil-derived ethane-1,2-diamine, EDA, by varying amine/polyurethane ratio (F/A, 1:1 and 1:0.6). The obtained depolymerized systems were analyzed by FTIR and NMR characterizations to understand the effect of both diamines on the degradation pathway. The use of bio-based BDA seemed to be more effective with respect to conventional EDA, owing to its stronger basicity (and thus higher nucleophilicity), corresponding to faster depolymerization rates. BDA-based depolymerized systems were then employed to prepare second-generation bio-based composite polyurethane foams by partial replacement of isocyanate components (20 wt%). The morphological, mechanical, and thermal conductivity properties of the second-generation polyurethane foams were evaluated. The best performances (σ10 %=71 ± 9 kPa, λ = 0.042 ± 0.015 W∙ m-1 ∙K-1) were attained by employing the lowest F/A ratio (1:0.6); this demonstrates their potential application in different sectors such as packaging or construction, fulfilling the paradigm of the circular economy. KW - Health, Toxicology and Mutagenesis KW - Public Health, Environmental and Occupational Health KW - Pollution KW - General Medicine Y1 - 2024 U6 - https://doi.org/10.1016/j.ecoenv.2023.115758 SN - 0147-6513 VL - 269 ER - TY - GEN A1 - Hantelmann, Cord A1 - Fritzsche, Sebastian A1 - Michailov, Vesselin A1 - Boywitt, Ralf A1 - Risse, Steffen A1 - Paulinus, Dietmar T1 - Utilisation of aluminium foam sandwich components in welded structures T2 - Welding and Cutting Y1 - 2016 SN - 1612-3433 IS - 5 SP - 317 EP - 325 ER - TY - GEN A1 - Mai, Christian A1 - Marschmeyer, Steffen A1 - Peczek, Anna A1 - Kroh, Aleksandra A1 - Jose, Josmy A1 - Reiter, Sebastian A1 - Fischer, Inga Anita A1 - Wenger, Christian A1 - Mai, Andreas T1 - Integration Aspects of Plasmonic TiN-based Nano-Hole-Arrays on Ge Photodetectorsin a 200mm Wafer CMOS Compatible Silicon Technology T2 - ECS Transactions N2 - In this work we present the progress in regard to the integration of a surface plasmon resonance refractive index sensor into a CMOS compatible 200 mm wafer silicon-based technology. Our approach pursues the combination of germanium photodetectors with metallic nanohole arrays. The paper is focused on the technology development to fabricate large area photodetectors based on a modern design concept. In a first iteration we achieved a leakage current density of 82 mA/cm2 at reverse bias of 0.5 V and a maximum optical responsivity of 0.103 A/W measured with TE polarized light at λ = 1310 nm and a reversed bias of 1 V. For the realization of nanohole arrays we used thin Titanium nitride (TiN) layers deposited by a sputtering process. We were able to produce very homogenous TiN layers with a thickness deviation of around 10 % and RMS of 1.413 nm for 150 nm thick TiN layers. KW - plasmonics KW - nanohole array KW - germanium detector Y1 - 2022 U6 - https://doi.org/10.1149/10904.0035ecst SN - 1938-5862 VL - 109 IS - 4 SP - 35 EP - 46 ER - TY - GEN A1 - Neyret, Margot A1 - Le Provost, Gaëtane A1 - Boesing, Andrea Larissa A1 - Schneider, Florian D. A1 - Baulechner, Dennis A1 - Bergmann, Joana A1 - Vries, Franciska T. de A1 - Fiore-Donno, Anna Maria A1 - Geisen, Stefan A1 - Goldmann, Kezia A1 - Merges, Anna A1 - Saifutdinov, Ruslan A. A1 - Simons, Nadja K. A1 - Tobias, Joseph A. A1 - Zaitsev, Andrey S. A1 - Gossner, Martin M. A1 - Jung, Kirsten A1 - Kandeler, Ellen A1 - Krauss, Jochen A1 - Penone, Caterina A1 - Schloter, Michael A1 - Schulz, Stefanie A1 - Staab, Michael A1 - Wolters, Volkmar A1 - Apostolakis, Antonios A1 - Birkhofer, Klaus A1 - Boch, Steffen A1 - Boeddinghaus, Runa S. A1 - Bolliger, Ralph A1 - Bonkowski, Michael A1 - Buscot, François A1 - Dumack, Kenneth A1 - Fischer, Markus A1 - Gan, Huei Ying A1 - Heinze, Johannes A1 - Hölzel, Norbert A1 - John, Katharina A1 - Klaus, Valentin H. A1 - Kleinebecker, Till A1 - Marhan, Sven A1 - Müller, Jörg A1 - Renner, Swen C. A1 - Rillig, Matthias C. A1 - Schenk, Noëlle V. A1 - Schöning, Ingo A1 - Schrumpf, Marion A1 - Seibold, Sebastian A1 - Socher, Stephanie A. A1 - Solly, Emily F. A1 - Teuscher, Miriam A1 - Kleunen, Mark van A1 - Wubet, Tesfaye A1 - Manning, Peter T1 - A slow-fast trait continuum at the whole community level in relation to land-use intensification T2 - Nature Communications N2 - AbstractOrganismal functional strategies form a continuum from slow- to fast-growing organisms, in response to common drivers such as resource availability and disturbance. However, whether there is synchronisation of these strategies at the entire community level is unclear. Here, we combine trait data for 2800 above- and belowground taxa from 14 trophic guilds spanning a disturbance and resource availability gradient in German grasslands. The results indicate that most guilds consistently respond to these drivers through both direct and trophically mediated effects, resulting in a ‘slow-fast’ axis at the level of the entire community. Using 15 indicators of carbon and nutrient fluxes, biomass production and decomposition, we also show that fast trait communities are associated with faster rates of ecosystem functioning. These findings demonstrate that ‘slow’ and ‘fast’ strategies can be manifested at the level of whole communities, opening new avenues of ecosystem-level functional classification. KW - General Physics and Astronomy KW - General Biochemistry KW - General Chemistry KW - Multidisciplinary KW - Genetics and Molecular Biology Y1 - 2024 U6 - https://doi.org/10.1038/s41467-024-45113-5 SN - 2041-1723 VL - 15 IS - 1 ER -