@misc{BundschuhRappelBocketal., author = {Bundschuh, Jana and Rappel, Herbert and Bock, Andreas and Balleisen, Ute and Daiser, Markus and Friedmann, G{\"u}nter and K{\"o}nig, Werner and Miltenberger, Tobias and M{\"u}ller, Manuela and M{\"u}ller, Robert and Poeplau, Norbert and Roosen, Alix and Schlotter, Alexander and Sedlmair, Christian and Weiler, Michael and Thewes, Christoph and Brock, Christopher}, title = {Effects of queen excluders on the colony dynamics of honeybees (Apis mellifera L.) under biodynamic management}, series = {Apidologie}, volume = {55}, journal = {Apidologie}, number = {16}, issn = {1297-9678}, doi = {10.1007/s13592-023-01041-9}, abstract = {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.}, language = {en} } @inproceedings{MuellerDanzecaGarciaAliaetal., author = {M{\"u}ller, Steffen and Danzeca, Salvatore and Garcia Al{\´i}a, Rub{\´e}n and Brugger, Markus and Weigel, Robert and K{\"o}lpin, Alexander}, title = {Circuit design for a radiation tolerant 2.4 GHz synthesizer based on COTS components}, series = {IEEE Topical Workshop on Internet of Space, 14-17 January 2018, Anaheim, California, USA}, booktitle = {IEEE Topical Workshop on Internet of Space, 14-17 January 2018, Anaheim, California, USA}, publisher = {IEEE}, address = {Piscataway, NJ}, isbn = {978-1-5386-1294-1}, doi = {10.1109/TWIOS.2018.8311400}, pages = {13 -- 16}, language = {en} } @techreport{ThonickeRahnerArnethetal., author = {Thonicke, Kirsten and Rahner, Eva and Arneth, Almut and Bartkowski, Bartosz and Bonn, Aletta and D{\"o}hler, Christian and Finger, Robert and Freitag, Jens and Grosch, Rita and Grossart, Hans-Peter and Gr{\"u}tzmacher, Kim and Hartman Scholz, Amber and H{\"a}user, Christoph and Hickler, Thomas and H{\"o}lker, Franz and J{\"a}hnig, Sonja C. and Jeschke, Jonathan and Kassen, Rees and Kastner, Thomas and Kramer-Schadt, Stephanie and Krug, Cornelia and Lakner, Sebastian and Loft, Lasse and Matzdorf, Bettina and Meakins, Felicity and De Meester, Luc and Monaghan, Michael T. and M{\"u}ller, Daniel and Overmann, J{\"o}rg and Quaas, Martin and Radchuk, Viktoriia and Reyer, Christopher and Roos, Christian and Scholz, Imme and Schroer, Sibylle and Sioen, Giles Bruno and Sommer, Simone and Sommerwerk, Nike and Tockner, Klement and Turk, Zachary and Warner, Barbara and W{\"a}tzold, Frank and Wende, Wolfgang and Veenstra, Tonjes and Voort, Hein van de}, title = {10 Must-Knows aus der Biodiversit{\"a}tsforschung}, publisher = {Potsdam-Institut f{\"u}r Klimafolgenforschung e.V. (PIK)}, address = {Potsdam}, doi = {10.5281/zenodo.6257476}, pages = {58}, language = {de} } @misc{SchobSagradovRoszaketal., author = {Schob, Daniela and Sagradov, Ilja and Roszak, Robert and Sparr, Holger and Franke, Rainer and Ziegenhorn, Matthias and Kupsch, Andreas and Leonard, Fabien and M{\"u}ller, Bernd R. and Bruno, Giovanni}, title = {Experimental determination and numerical simulation of material and damage behaviour of 3d printed polyamide 12 under cyclic loading}, series = {Engineering Fracture Mechanics}, volume = {229}, journal = {Engineering Fracture Mechanics}, issn = {0013-7944}, doi = {10.1016/j.engfracmech.2019.106841}, pages = {13}, abstract = {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.}, language = {en} } @misc{SchobRoszakSagradovetal., author = {Schob, Daniela and Roszak, Robert and Sagradov, Ilja and Sparr, Holger and Kupsch, Andreas and Leonard, Fabien and M{\"u}ller, Bernd R. and Bruno, Giovanni}, title = {Experimental and numerical simulation of material and damage behaviour of 3d printed polyamide 12 under quasi-static-loading}, series = {Archives of Mechanics}, volume = {71}, journal = {Archives of Mechanics}, number = {4-5}, issn = {0373-2029}, doi = {10.24423/aom.3162}, pages = {507 -- 526}, abstract = {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.}, language = {en} } @book{HoffmannAndersFischeretal., author = {Hoffmann, Melanie and Anders, Kenneth and Fischer, Lars and B{\"o}llmann, J{\"o}rg and Br{\"u}ckner, Ardo and Brunk, Ingo and Donath, Helmut and Donat, Ralf and Elmer, Michael and G{\"u}th, Mareike and H{\"a}ußler, Robert and Mrzljak, Jadranka and Mudra, Dieter and M{\"u}ller, Markus and Peschel, Tim and Pilz, Wilfried and Sawade, Wolfgang and Schonert, P. and Siedschlag, Marina and Siedschlag, Yvonne and Wanner, Manfred and W{\"o}llecke, Jens}, title = {Kolonisten gesucht! Steckbriefe nat{\"u}rlicher und sozialer Besiedler der Bergbaufolgelandschaft Schlabendorfer Felder}, editor = {Hoffmann, Melanie and Anders, Kenneth and Fischer, Lars}, publisher = {B{\"u}ro f{\"u}r Landschaftskommunikation}, address = {Bad Freienwalde}, pages = {52}, language = {de} }