TY - GEN A1 - Bundschuh, Jana A1 - Rappel, Herbert A1 - Bock, Andreas A1 - Balleisen, Ute A1 - Daiser, Markus A1 - Friedmann, Günter A1 - König, Werner A1 - Miltenberger, Tobias A1 - Müller, Manuela A1 - Müller, Robert A1 - Poeplau, Norbert A1 - Roosen, Alix A1 - Schlotter, Alexander A1 - Sedlmair, Christian A1 - Weiler, Michael A1 - Thewes, Christoph A1 - Brock, Christopher T1 - Effects of queen excluders on the colony dynamics of honeybees (Apis mellifera L.) under biodynamic management T2 - Apidologie N2 - The evaluation of beekeeping management practices (BMPs) is important for beekeepers worldwide because their choice affects health and survival of managed honeybee (A. mellifera L.) colonies and touches ethical and economic questions. This study focusses on queen excluders, a common hive addition in contemporary beekeeping. Its impacts are controversially discussed but have not been studied scientifically yet. Within a 4-year participatory on-farm experiment, we assessed the effects on colony dynamics in 64 hives in 8 apiaries during one season in Germany using the Liebefeld estimation method. We found no significant deviation for parameters of colony dynamics between hives managed with and without queen excluders. A qualitative decision-making tool (Pugh decision matrix) facilitated concept selection only for specific beekeepers. Y1 - 2024 UR - https://link.springer.com/article/10.1007/s13592-023-01041-9 U6 - https://doi.org/10.1007/s13592-023-01041-9 SN - 1297-9678 SN - 0044-8435 VL - 55 IS - 16 ER - TY - CHAP A1 - Müller, Steffen A1 - Danzeca, Salvatore A1 - Garcia Alía, Rubén A1 - Brugger, Markus A1 - Weigel, Robert A1 - Kölpin, Alexander T1 - Circuit design for a radiation tolerant 2.4 GHz synthesizer based on COTS components T2 - IEEE Topical Workshop on Internet of Space, 14-17 January 2018, Anaheim, California, USA Y1 - 2018 SN - 978-1-5386-1294-1 U6 - https://doi.org/10.1109/TWIOS.2018.8311400 SP - 13 EP - 16 PB - IEEE CY - Piscataway, NJ ER - TY - RPRT A1 - Thonicke, Kirsten A1 - Rahner, Eva A1 - Arneth, Almut A1 - Bartkowski, Bartosz A1 - Bonn, Aletta A1 - Döhler, Christian A1 - Finger, Robert A1 - Freitag, Jens A1 - Grosch, Rita A1 - Grossart, Hans-Peter A1 - Grützmacher, Kim A1 - Hartman Scholz, Amber A1 - Häuser, Christoph A1 - Hickler, Thomas A1 - Hölker, Franz A1 - Jähnig, Sonja C. A1 - Jeschke, Jonathan A1 - Kassen, Rees A1 - Kastner, Thomas A1 - Kramer-Schadt, Stephanie A1 - Krug, Cornelia A1 - Lakner, Sebastian A1 - Loft, Lasse A1 - Matzdorf, Bettina A1 - Meakins, Felicity A1 - De Meester, Luc A1 - Monaghan, Michael T. A1 - Müller, Daniel A1 - Overmann, Jörg A1 - Quaas, Martin A1 - Radchuk, Viktoriia A1 - Reyer, Christopher A1 - Roos, Christian A1 - Scholz, Imme A1 - Schroer, Sibylle A1 - Sioen, Giles Bruno A1 - Sommer, Simone A1 - Sommerwerk, Nike A1 - Tockner, Klement A1 - Turk, Zachary A1 - Warner, Barbara A1 - Wätzold, Frank A1 - Wende, Wolfgang A1 - Veenstra, Tonjes A1 - Voort, Hein van de T1 - 10 Must-Knows aus der Biodiversitätsforschung Y1 - 2022 U6 - https://doi.org/10.5281/zenodo.6257476 PB - Potsdam-Institut für Klimafolgenforschung e.V. (PIK) CY - Potsdam ER - TY - GEN A1 - Schob, Daniela A1 - Sagradov, Ilja A1 - Roszak, Robert A1 - Sparr, Holger A1 - Franke, Rainer A1 - Ziegenhorn, Matthias A1 - Kupsch, Andreas A1 - Leonard, Fabien A1 - Müller, Bernd R. A1 - Bruno, Giovanni T1 - Experimental determination and numerical simulation of material and damage behaviour of 3d printed polyamide 12 under cyclic loading T2 - Engineering Fracture Mechanics N2 - The material and damage behaviour of additively manufactured polyamide 12 under cyclic loading was characterized by cyclic tests and microstructure analysis by using microscopy, X-ray refraction, and computed tomography. The results were used to determine parameters for the viscoplastic material model by Chaboche and a damage model by Gurson-Tvergaard-Needleman. The temperature was monitored during the experiments and the self-heating effect was observed. By including this effect, a higher accuracy could be achieved with the results of mechanical experiments. KW - 3D printing Polyamide 12 KW - Chaboche model KW - GTN model KW - Material and damage behaviour KW - X-ray refraction KW - computed tomography Y1 - 2020 U6 - https://doi.org/10.1016/j.engfracmech.2019.106841 SN - 0013-7944 VL - 229 ER - TY - GEN A1 - Schob, Daniela A1 - Roszak, Robert A1 - Sagradov, Ilja A1 - Sparr, Holger A1 - Kupsch, Andreas A1 - Leonard, Fabien A1 - Müller, Bernd R. A1 - Bruno, Giovanni T1 - Experimental and numerical simulation of material and damage behaviour of 3d printed polyamide 12 under quasi-static-loading T2 - Archives of Mechanics N2 - In order to characterise the material and damage behaviour of additively manufactured polyamide 12 (PA12) under quasi-static load and to implement it in a numerical model, experiments under quasi-static load as well as microstructural investigations were carried out. Selective laser sintering (SLS) was used as the manufacturing process. For the classification of the material behaviour, quasi-static cyclic tests with holding times as well as tensile tests were performed. X-ray refraction and computed tomography (CT) were used to investigate the damage behaviour. The Chaboche model, which has already been applied for metallic materials under thermomechanical loading, served as the basis for the selection of the numerical material model. The same procedure was used for the selection of the damage model, where the Gurson–Tvergaard–Needleman (GTN) model was chosen, which was already used for porous metallic materials. The Chaboche model shows very good agreement with experimental results. Furthermore, the coupling with the GTN model allows a very good modelling of the damage behaviour. Finally, it could be shown that the selected models are suitable to simulate the material and damage behaviour of 3D printed PA12. KW - Polyamide 12 KW - 3D printing KW - Viscoplastic KW - Chaboche model KW - Damage KW - GTN model KW - X-ray refraction KW - Computed tomography Y1 - 2019 UR - https://am.ippt.pan.pl/am/article/viewFile/v71p507/pdf U6 - https://doi.org/10.24423/aom.3162 SN - 0373-2029 VL - 71 IS - 4-5 SP - 507 EP - 526 ER - TY - BOOK A1 - Hoffmann, Melanie A1 - Anders, Kenneth A1 - Fischer, Lars A1 - Böllmann, Jörg A1 - Brückner, Ardo A1 - Brunk, Ingo A1 - Donath, Helmut A1 - Donat, Ralf A1 - Elmer, Michael A1 - Güth, Mareike A1 - Häußler, Robert A1 - Mrzljak, Jadranka A1 - Mudra, Dieter A1 - Müller, Markus A1 - Peschel, Tim A1 - Pilz, Wilfried A1 - Sawade, Wolfgang A1 - Schonert, P. A1 - Siedschlag, Marina A1 - Siedschlag, Yvonne A1 - Wanner, Manfred A1 - Wöllecke, Jens ED - Hoffmann, Melanie ED - Anders, Kenneth ED - Fischer, Lars T1 - Kolonisten gesucht! Steckbriefe natürlicher und sozialer Besiedler der Bergbaufolgelandschaft Schlabendorfer Felder Y1 - 2010 PB - Büro für Landschaftskommunikation CY - Bad Freienwalde ER -