@misc{BuchananLewisParisetal., author = {Buchanan, Erin M. and Lewis, Savannah C. and Paris, Bastien and Forscher, Patrick S. and Pavlacic, Jeffrey M. and Beshears, Julie E. and Drexler, Shira Meir and Gourdon-Kanhukamwe, Am{\´e}lie and Mallik, Peter R and Silan, Miguel Alejandro A. and Miller, Jeremy K. and IJzerman, Hans and Moshontz, Hannah and Beaudry, Jennifer L. and Suchow, Jordan W. and Chartier, Christopher R. and Coles, Nicholas A. and Sharifian, MohammadHasan and Todsen, Anna Louise and Levitan, Carmel A. and Azevedo, Fl{\´a}vio and Legate, Nicole and Heller, Blake and Rothman, Alexander J. and Dorison, Charles A. and Gill, Brian P. and Wang, Ke and Rees, Vaughan W. and Gibbs, Nancy and Goldenberg, Amit and Thi Nguyen, Thuy-vy and Gross, James J. and Kaminski, Gwena{\^e}l and von Bastian, Claudia C. and Paruzel-Czachura, Mariola and Mosannenzadeh, Farnaz and Azouaghe, Soufian and Bran, Alexandre and Ruiz-Fernandez, Susana and Santos, Anabela Caetano and Reggev, Niv and Zickfeld, Janis H. and Akkas, Handan and Pantazi, Myrto and Ropovik, Ivan and Korbmacher, Max and Arriaga, Patr{\´i}cia and Gjoneska, Biljana and Warmelink, Lara and Alves, Sara G. and de Holanda Coelho, Gabriel Lins and Stieger, Stefan and Schei, Vidar and Hanel, Paul H. P. and Szaszi, Barnabas and Fedotov, Maksim and Antfolk, Jan and Marcu, Gabriela-Mariana and Schr{\"o}tter, Jana and Kunst, Jonas R. and Geiger, Sandra J. and Adetula, Adeyemi and Kocalar, Halil Emre and Kielińska, Julita and Kačm{\´a}r, Pavol and Bokkour, Ahmed and Galindo-Caballero, Oscar J. and Djamai, Ikhlas and P{\"o}ntinen, Sara Johanna and AGESIN, Bamikole Emmanuel and Jerns{\"a}ther, Teodor and Urooj, Anum and Rachev, Nikolay R. and Koptjevskaja-Tamm, Maria and Kurfal{\i}, Murathan and Pit, Ilse L. and Li, Ranran and {\c{C}}oksan, Sami and Dubrov, Dmitrii and Paltrow, Tamar Elise and Ban{\´i}k, Gabriel and Korobova, Tatiana and Studzinska, Anna and Jiang, Xiaoming and Aruta, John Jamir Benzon R. and Vintr, J{\´a}chym and Chiu, Faith and Kaliska, Lada and Berkessel, Jana B. and T{\"u}mer, Murat and Morales-Izquierdo, Sara and Chuan-Peng, Hu and Vezirian, Kevin and Rosa, Anna Dalla and Bialobrzeska, Olga and Vasilev, Martin R. and Beitner, Julia and K{\´a}cha, Ondřej and Žuro, Barbara and Westerlund, Minja and Nedelcheva-Datsova, Mina and Findor, Andrej and Krupić, Dajana and Kowal, Marta and Askelund, Adrian Dahl and Pourafshari, Razieh and Đorđević, Jasna Milošević and Schmidt, Nadya-Daniela and Baklanova, Ekaterina and Szala, Anna and Zakharov, Ilya and Vranka, Marek A. and Ihaya, Keiko and Grano, Caterina and Cellini, Nicola and Białek, Michał and Anton-Boicuk, Lisa and Dalgar, Ilker and Ad{\i}g{\"u}zel, Arca and Verharen, Jeroen P. H. and Maturan, Princess Lovella G. and Kassianos, Angelos P. and Oliveira, Raquel and Čadek, Martin and Adoric, Vera Cubela and {\"O}zdoğru, Asil Ali and Sverdrup, Therese E. and Aczel, Balazs and Zambrano, Danilo and Ahmed, Afroja and Tamnes, Christian K. and Yamada, Yuki and Volz, Leonhard and Sunami, Naoyuki and Suter, Lilian and Vieira, Luc and Groyecka-Bernard, Agata and Kamburidis, Julia Arhondis and Reips, Ulf-Dietrich and Harutyunyan, Mikayel and Adetula, Gabriel Agboola and Allred, Tara Bulut and Barzykowski, Krystian and Antazo, Benedict G and Zsido, Andras N. and Šakan, Dušana Dušan and Cyrus-Lai, Wilson and Ahlgren, Lina Pernilla and Hruška, Matej and Vega, Diego and Manunta, Efisio and Mokady, Aviv and Capizzi, Mariagrazia and Martončik, Marcel and Say, Nicolas and Filip, Katarzyna and Vilar, Roosevelt and Staniaszek, Karolina and Vdovic, Milica and Adamkovic, Matus and Johannes, Niklas and Hajdu, Nandor and Cohen, Noga and Overkott, Clara and Krupić, Dino and Hubena, Barbora and Nilsonne, Gustav and Mioni, Giovanna and Solorzano, Claudio Singh and Ishii, Tatsunori and Chen, Zhang and Kushnir, Elizaveta and Karaarslan, Cemre and Ribeiro, Rafael R. and Khaoudi, Ahmed and Kossowska, Małgorzata and Bavolar, Jozef and Hoyer, Karlijn and Roczniewska, Marta and Karababa, Alper and Becker, Maja and Monteiro, Renan P. and Kunisato, Yoshihiko and Metin-Orta, Irem and Adamus, Sylwia and Kozma, Luca and Czarnek, Gabriela and Domurat, Artur and Štrukelj, Eva and Alvarez, Daniela Serrato and Parzuchowski, Michal and Massoni, S{\´e}bastien and Czamanski-Cohen, Johanna and Pronizius, Ekaterina and Muchembled, Fany and van Schie, Kevin and Sa{\c{c}}akl{\i}, Asl{\i} and Hristova, Evgeniya and Kuzminska, Anna O. and Charyate, Abdelilah and Bijlstra, Gijsbert and Afhami, Reza and Majeed, Nadyanna M. and Musser, Erica D. and Sirota, Miroslav and Ross, Robert M. and Yeung, Siu Kit and Papadatou-Pastou, Marietta and Foroni, Francesco and Almeida, In{\^e}s A. T. and Grigoryev, Dmitry and Lewis, David M. G. and Holford, Dawn L. and Janssen, Steve M. J. and Tatachari, Srinivasan and Batres, Carlota and Olofsson, Jonas K. and Daches, Shimrit and Belaus, Anabel and Pfuhl, Gerit and Corral-Frias, Nadia Sarai and Sousa, Daniela and R{\"o}er, Jan Philipp and Isager, Peder Mortvedt and Godbersen, Hendrik and Walczak, Radoslaw B. and Van Doren, Natalia and Ren, Dongning and Gill, Tripat and Voracek, Martin and DeBruine, Lisa M. and Anne, Michele and Očovaj, Sanja Batić and Thomas, Andrew G. and Arvanitis, Alexios and Ostermann, Thomas and Wolfe, Kelly and Arinze, Nwadiogo Chisom and Bundt, Carsten and Lamm, Claus and Calin-Jageman, Robert J and Davis, William E. and Karekla, Maria and Zorjan, Saša and Jaremka, Lisa M. and Uttley, Jim and Hricova, Monika and Koehn, Monica A and Kiselnikova, Natalia and Bai, Hui and Krafnick, Anthony J. and Balci, Busra Bahar and Ballantyne, Tonia and Lins, Samuel and Vally, Zahir and Esteban-Serna, Celia and Schmidt, Kathleen and Macapagal, Paulo Manuel L. and Szwed, Paulina and Zdybek, Przemysław Marcin and Moreau, David and Collins, W. Matthew and Joy-Gaba, Jennifer A. and Vilares, Iris and Tran, Ulrich S. and Boudesseul, Jordane and Albayrak-Aydemir, Nihan and Dixson, Barnaby James Wyld and Perillo, Jennifer T and Ferreira, Ana and Westgate, Erin C. and Aberson, Christopher L. and Arinze, Azuka Ikechukwu and Jaeger, Bastian and Butt, Muhammad Mussaffa and Silva, Jaime R. and Storage, Daniel Shafik and Janak, Allison P and Jim{\´e}nez-Leal, William and Soto, Jose A. and Sorokowska, Agnieszka and McCarthy, Randy and Tullett, Alexa M and Frias-Armenta, Martha and Ribeiro, Matheus Fernando Felix and Hartanto, Andree and Forbes, Paul A. G. and Willis, Megan L. and del Carmen Tejada R, Mar{\´i}a and Torres, Adriana Julieth Olaya and Stephen, Ian D and Vaidis, David C. and de la Rosa-G{\´o}mez, Anabel and Yu, Karen and Sutherland, Clare A. M. and Manavalan, Mathi and Behzadnia, Behzad and Urban, Jan and Baskin, Ernest and McFall, Joseph P. and Ogbonnaya, Chisom Esther and Fu, Cynthia H. Y. and Rahal, Rima-Maria and Ndukaihe, Izuchukwu L. G. and Hostler, Thomas J. and Kappes, Heather Barry and Sorokowski, Piotr and Khosla, Meetu and Lazarevic, Ljiljana B. and Eudave, Luis and Vilsmeier, Johannes K. and Luis, Elkin O. and Muda, Rafał and Agadullina, Elena and C{\´a}rcamo, Rodrigo A. and Reeck, Crystal and Anjum, Gulnaz and Venegas, M{\´o}nica Camila Toro and Misiak, Michal and Ryan, Richard M. and Nock, Nora L. and Travaglino, Giovanni A. and Mensink, Michael C. and Feldman, Gilad and Wichman, Aaron L. and Chou, Weilun and Ziano, Ignazio and Seehuus, Martin and Chopik, William J. and Kung, Franki Y. H. and Carpentier, Joelle and Vaughn, Leigh Ann and Du, Hongfei and Xiao, Qinyu and Lima, Tiago J. S. and Noone, Chris and Onie, Sandersan and Verbruggen, Frederick and Radtke, Theda and Primbs, Maximilian A.}, title = {The psychological science accelerator's COVID-19 rapid-response dataset}, series = {Scientific Data}, volume = {10}, journal = {Scientific Data}, number = {1}, publisher = {Springer Science and Business Media LLC}, issn = {2052-4463}, doi = {10.1038/s41597-022-01811-7}, pages = {1 -- 15}, language = {en} } @misc{BimboeseNicolayBryketal., author = {Bimb{\"o}se, Martin and Nicolay, Alexander and Bryk, Alexander and Schmidt, Karl-Heinz and Morche, David}, title = {Investigations on intra- and interannual coarse sediment dynamics in a high-mountain catchment}, series = {Zeitschrift f{\"u}r Geomorphologie : Supplementband}, volume = {55}, journal = {Zeitschrift f{\"u}r Geomorphologie : Supplementband}, number = {2}, doi = {10.1127/0372-8854/2011/0055S2-0046}, pages = {67 -- 81}, language = {en} } @inproceedings{PalekhovSchmidtHansmannetal., author = {Palekhov, Dmitry and Schmidt, Michael and Hansmann, Berthold and Palekhova, Ludmila and Kopylov, Andrey and Ivannikov, Alexander}, title = {Issues related to the organisation of university education towards sustainable development}, series = {Socio-Economic and Environmental Problems of the Mining Industry, Construction and Energy Sector, 10th International Conference on Problems the Mining Industry, Construction and Energy Sector, Tula, Russian Federation, 2014, Conference Proceedings, Vol. 1}, booktitle = {Socio-Economic and Environmental Problems of the Mining Industry, Construction and Energy Sector, 10th International Conference on Problems the Mining Industry, Construction and Energy Sector, Tula, Russian Federation, 2014, Conference Proceedings, Vol. 1}, editor = {Kovalev, Roman}, publisher = {Tula State University}, address = {Tula}, isbn = {978-57679-2923-8}, pages = {34 -- 51}, language = {ru} } @misc{JahnBlaudeckBaumannetal., author = {Jahn, Stephan F. and Blaudeck, Thomas and Baumann, Reinhard R. and Jakob, Alexander and Ecorchard, Petra and R{\"u}ffer, Tobias and Lang, Heinrich and Schmidt, Peer}, title = {Inkjet Printing of Conductive Silver Patterns by Using the First Aqueous Particle-Free MOD Ink without Additional Stabilizing Ligands}, series = {Chemistry of Materials}, volume = {22}, journal = {Chemistry of Materials}, number = {10}, issn = {1520-5002}, doi = {10.1021/cm9036428}, pages = {3067 -- 3071}, abstract = {The chemical and physical properties of [AgO2C(CH2OCH2)3H] (3) and its use as an aqueous, ligand-free MOD ink (MOD = metal-organic decomposition) for piezo inkjet printing is discussed. The printed, thermal, or photochemical sintered silver features are electrically conductive on glass (2.7 × 107 S m-1) and PET (PET = polyethylene terephthalate) substrates (1.1 × 107 S m-1) corresponding to 43\% and 18\% of the bulk silver conductivity. Conducted tape tests show the suitability of the ink for particularly polymer substrates. TG-MS studies demonstrate a two-step decomposition for the conversion of 3 to elemental silver. The structure of 3 in the solid state was determined by single X-ray structure determination.}, language = {en} } @misc{JahnJakobBlaudecketal., author = {Jahn, Stephan F. and Jakob, Alexander and Blaudeck, Thomas and Schmidt, Peer and Lang, Heinrich and Baumann, Reinhard R.}, title = {Inkjet printing of conductive patterns with an aqueous solution of [AgO2C(CH2OCH2)3H] without any additional stabilizing ligands}, series = {Thin Solid Films}, volume = {518}, journal = {Thin Solid Films}, number = {12}, issn = {0040-6090}, doi = {10.1016/j.tsf.2010.01.030}, pages = {3218 -- 3222}, abstract = {The use of silver(I)-2-[2-(2-methoxyethoxy)ethoxy]acetate, [AgO2C(CH2OCH2)3H], and its application as an aqueous metal-organic decomposition (MOD) inkjet ink is reported. The chemical and physical properties of the silver carboxylate and the ink formulated thereof are discussed. The ink meets all requirements of piezo driven inkjet printing. The printed features were converted into electrically conducting silver patterns by thermal or photo-thermal treatment. The conversion of [AgO2C(CH2OCH2)3H] to elemental silver follows a two-step decomposition as demonstrated by thermogravimetry-mass spectrometry (TG-MS) measurements. The measured conductivities of the printed features on glass and polyethylene-terephthalate (PET) are 2.7 × 107 S m-1 and 1.1 × 107 S m-1, respectively, which correspond to 43\% (glass) and 18\% (PET) of the bulk silver conductivity.}, language = {en} } @misc{PfisterSchaeferOttetal., author = {Pfister, Daniela and Sch{\"a}fer, Konrad and Ott, Claudia and Gerke, Birgit and P{\"o}ttgen, Rainer and Janka, Oliver and Baumgartner, Maximilian and Efimova, Anastasia and Hohmann, Andrea and Schmidt, Peer and Venkatachalam, Sabarinathan and W{\"u}llen, Leo van and Sch{\"u}rmann, Ulrich and Kienle, Lorenz and Duppel, Viola and Parzinger, Eric and Miller, Bastian and Becker, Jonathan and Holleitner, Alexander and Weihrich, Richard and Nilges, Tom}, title = {Inorganic double helices in semiconducting SnIP}, series = {Advanced Materials}, volume = {28}, journal = {Advanced Materials}, number = {44}, issn = {1521-4095}, doi = {10.1002/adma.201603135}, pages = {9783 -- 9791}, abstract = {SnIP is the first atomic-scale double helical semiconductor featuring a 1.86 eV bandgap, high structural and mechanical flexibility, and reasonable thermal stability up to 600 K. It is accessible on a gram scale and consists of a racemic mixture of right- and left-handed double helices composed by [SnI] and [P] helices. SnIP nanorods <20 nm in diameter can be accessed mechanically and chemically within minutes.}, language = {en} } @misc{ZeugnerKaiserSchmidtetal., author = {Zeugner, Alexander and Kaiser, Martin and Schmidt, Peer and Menshchikova, Tatiana V. and Rusinov, Igor P. and Markelov, Anton V. and Van den Broek, Wouter and Chulkov, Evgueni V. and Doert, Thomas and Ruck, Michael and Isaeva, Anna}, title = {Modular Design with 2D Topological-Insulator Building Blocks: Optimized Synthesis and Crystal Growth and Crystal and Electronic Structures of BiₓTeI (x = 2, 3)}, series = {Chemistry of Materials}, volume = {29}, journal = {Chemistry of Materials}, number = {3}, issn = {0897-4756}, doi = {10.1021/acs.chemmater.6b05038}, pages = {1321 -- 1337}, abstract = {Structural engineering of topological bulk materials is systematically explored with regard to the incorporation of the buckled bismuth layer [Bi₂], which is a 2D topological insulator per se, into the layered BiTeI host structure. The previously known bismuth telluride iodides, BiTeI and Bi₂TeI, offer physical properties relevant for spintronics. Herewith a new cousin, Bi₃TeI (sp.gr. R3m, a = 440.12(2) pm, c = 3223.1(2) pm), joins the ranks and expands this structural family. Bi₃TeI = [Bi₂][BiTeI] represents a stack with strictly alternating building blocks. Conditions for reproducible synthesis and crystal-growth of Bi₂TeI and Bi₃TeI are ascertained, thus yielding platelet-like crystals on the millimeter size scale and enabling direct measurements. The crystal structures of Bi₂TeI and Bi₃TeI are examined by X-ray diffraction and electron microscopy. DFT calculations predict metallic properties of Bi₃TeI and an unconventional surface state residing on various surface terminations. This state emerges as a result of complex hybridization of atomic states due to their strong intermixing. Our study does not support the existence of new stacking variants BiₓTeI with x > 3; instead, it indicates a possible homogeneity range of Bi₃TeI. The series BiTeI-Bi₂TeI-Bi₃TeI illustrates the influence of structural modifications on topological properties.}, language = {en} } @misc{PfetschFuegenschuhGeissleretal., author = {Pfetsch, Marc E. and F{\"u}genschuh, Armin and Geißler, Bj{\"o}rn and Geißler, Nina and Gollmer, Ralf and Hiller, Benjamin and Humpola, Jesco and Koch, Thorsten and Lehmann, Thomas and Martin, Alexander and Morsi, Antonio and R{\"o}vekamp, Jessica and Schewe, Lars and Schmidt, Martin and Schultz, R{\"u}diger and Schwarz, Robert and Schweiger, Jonas and Stangl, Claudia and Steinbach, Marc C. and Vigerske, Stefan and Willert, Bernhard M.}, title = {Validation of Nominations in Gas Network Optimization: Models, Methods, and Solutions}, series = {Optimization Methods and Software}, volume = {30}, journal = {Optimization Methods and Software}, number = {1}, issn = {1055-6788}, doi = {10.1080/10556788.2014.888426}, pages = {15 -- 53}, language = {en} } @incollection{RoedigerSchierackBoehmetal., author = {R{\"o}diger, Stefan and Schierack, Peter and B{\"o}hm, Alexander and Nitschke, J{\"o}rg and Berger, Ingo and Fr{\"o}mmel, Ulrike and Schmidt, Carsten and Ruhland, Mirko and Schimke, Ingolf and Roggenbuck, Dirk and Lehmann, Werner and Schr{\"o}der, Christian}, title = {A highly versatile microscope imaging technology platform for the multiplex real-time detection of biomolecules and autoimmune antibodies}, series = {Molecular diagnostics}, booktitle = {Molecular diagnostics}, editor = {Seitz, Harald and Berger, Ingo}, publisher = {Springer}, address = {Berlin [u.a.]}, isbn = {978-3-642-37690-0}, pages = {35 -- 74}, language = {en} } @inproceedings{RoedigerBoehmNitschkeetal., author = {R{\"o}diger, Stefan and B{\"o}hm, Alexander and Nitschke, J{\"o}rg and Stavitskaya, Luba and Gruner, Melanie and Kundzer, Alena V. and Volkova, Margarita V. and Generalov, I. and Schmidt, Carsten and Schr{\"o}der, Christian and Roggenbuck, Dirk and Schierack, Peter}, title = {Development of a Method for Multiplex Real-Time Analysis of Enzymatic Activity on a Microbead-Chip}, series = {Infection, tumors and autoimmunity, report on the 11th Dresden Symposium on Autoantibodies held in Dresden on September 1-4, 2013}, booktitle = {Infection, tumors and autoimmunity, report on the 11th Dresden Symposium on Autoantibodies held in Dresden on September 1-4, 2013}, publisher = {Pabst Science Publ.}, address = {Lengerich [u.a.]}, isbn = {978-3-89967-881-9}, pages = {275 -- 280}, language = {en} } @inproceedings{RoedigerBoehmNitschkeetal., author = {R{\"o}diger, Stefan and B{\"o}hm, Alexander and Nitschke, J{\"o}rg and Stavitskaya, Luba and Gruner, Melanie and Kundzer, Alena V. and Volkova, Margarita V. and Generalov, I. and Schmidt, Carsten and Schr{\"o}der, Christian and Roggenbuck, Dirk and Schierack, Peter}, title = {Development of a Method for Multiplex Real-Time Analysis of Enzymati c Activity on a Microbead-Chip.}, series = {Infections, Tumors and Autoimmunity, Report on the 11th Dresden Symposium on Autoantibodies held in Dresden on September 01. - 04., 2013}, booktitle = {Infections, Tumors and Autoimmunity, Report on the 11th Dresden Symposium on Autoantibodies held in Dresden on September 01. - 04., 2013}, publisher = {Pabst Science Publ.}, address = {Lengerich}, isbn = {978-3-89967-881-9}, pages = {280}, language = {en} } @misc{FuegenschuhGeisslerGollmeretal., author = {F{\"u}genschuh, Armin and Geißler, Bj{\"o}rn and Gollmer, Ralf and Hayn, Christine and Henrion, Ren{\´e} and Hiller, Benjamin and Humpola, Jesco and Koch, Thorsten and Lehmann, Thomas and Martin, Alexander and Mirkov, Radoslava and Morsi, Antonio and R{\"o}vekamp, Jessica and Schewe, Lars and Schmidt, Martin and Schultz, R{\"u}diger and Schwarz, Robert and Schweiger, Jonas and Stangl, Claudia and Steinbach, Marc C. and Willert, Bernhard M.}, title = {Mathematical Optimization for Challenging Network Planning Problems in Un- bundled Liberalized Gas Markets}, series = {Energy Systems}, volume = {5}, journal = {Energy Systems}, number = {3}, issn = {1868-3975}, doi = {10.1007/s12667-013-0099-8}, pages = {449 -- 473}, language = {en} } @misc{CharisseErusPomponioetal., author = {Chariss{\´e}, Daniel and Erus, Guray and Pomponio, Raymond and Gorges, Martin and Schmidt, Nele and Schneider, Christine and Liepelt-Scarfone, Inga and Riedel, Oliver and Reetz, Kathrin and Schulz, J{\"o}rg B. and Berg, Daniela and Storch, Alexander and Witt, Karsten and Dodel, Richard and Kalbe, Elke and Kassubek, Jan and Hilker-Roggendorf, R{\"u}diger and Baudrexel, Simon}, title = {Brain age and Alzheimer's-like atrophy are domain-specific predictors of cognitive impairment in Parkinson's disease}, series = {Neurobiology of Aging}, volume = {109}, journal = {Neurobiology of Aging}, issn = {0197-4580}, doi = {10.1016/j.neurobiolaging.2021.08.020}, pages = {31 -- 42}, abstract = {Recently, it was shown that patients with Parkinson's disease (PD) who exhibit an "Alzheimer's disease (AD)-like" pattern of brain atrophy are at greater risk for future cognitive decline. This study aimed to investigate whether this association is domain-specific and whether atrophy associated with brain aging also relates to cognitive impairment in PD. SPARE-AD, an MRI index capturing AD-like atrophy, and atrophy-based estimates of brain age were computed from longitudinal structural imaging data of 178 PD patients and 84 healthy subjects from the LANDSCAPE cohort. All patients underwent an extensive neuropsychological test battery. Patients diagnosed with mild cognitive impairment or dementia were found to have higher SPARE-AD scores as compared to patients with normal cognition and healthy controls. All patient groups showed increased brain age. SPARE-AD predicted impairment in memory, language and executive functions, whereas advanced brain age was associated with deficits in attention and working memory. Data suggest that SPARE-AD and brain age are differentially related to domain-specific cognitive decline in PD. The underlying pathomechanisms remain to be determined.}, language = {en} } @misc{SchmidtEmdadiHaertel, author = {Schmidt, Alexander and Emdadi, Aliakbar and H{\"a}rtel, Sebastian}, title = {A holistic approach for near-net-shape processing of iron aluminides by means of Laser Directed Energy Deposition with cored wires}, series = {77th IIW Annual assembly and international conference on welding and joining, 7-12 July 2024, Rhodes}, volume = {2024}, journal = {77th IIW Annual assembly and international conference on welding and joining, 7-12 July 2024, Rhodes}, pages = {6}, abstract = {Iron aluminides are characterized by high corrosion resistance, excellent mechanical properties and dimensional stability at high temperatures. With a low density this material offers technological and economic advantages over Ni-based alloys in the aerospace sector. Because of the excellent mechanical properties machining is the current challenge in processing Fe-Al. Due to the possibility of near-net-shape manufacturing along with high material efficiency additive manufacturing processes such as L-DED with wires seem to be predestined for the processing of Fe-Al. In this paper, a holistic approach for processing Fe-Al including manufacturing of wires and the actual processing of the wires is described. Since the wire drawing of iron aluminides is not possible due to low forming characteristics, a rotary swaging process was applied for manufacturing cored wires with a steel shell and aluminum core. On the one hand, the usage of unalloyed raw materials with suitable forming properties are advantageous. On the other hand, cored wires require in-situ alloying of the steel shell and aluminum core during the application process. Thus, the weldability of such cored wires was investigated in preliminary tests, initially using a tungsten inert gas welding process. The wires and the welding results were characterized by scanning electron microscopy, hardness measurement, and X-ray analyses.}, language = {en} } @misc{FlorianSchrickerZenzetal., author = {Florian, Tobias and Schricker, Klaus and Zenz, Constantin and Otto, Andreas and Schmidt, Leander and Diegel, Christian and Friedmann, Hannes and Seibold, Marc and Hellwig, Peter and Fr{\"o}hlich, Fabian and Nagel, Falk and Kallage, Peter and Buttazzoni, Michele and Rack, Alexander and Requardt, Herwig and Chen, Yunhui and Bergmann, Jean Pierre}, title = {Combining in situ synchrotron X-ray imaging and multiphysics simulation to reveal pore formation dynamics in laser welding of copper}, series = {International Journal of Machine Tools and Manufacture}, volume = {204}, journal = {International Journal of Machine Tools and Manufacture}, publisher = {Elsevier BV}, issn = {0890-6955}, doi = {10.1016/j.ijmachtools.2024.104224}, pages = {1 -- 22}, abstract = {Laser beam welding has emerged as a powerful tool for manufacturing copper components in electrical vehicles, electronic devices or energy storage, owing to its rapid processing capabilities. Nonetheless, the material's high thermal conductivity and low absorption of infrared light can introduce process instabilities, resulting in defects such as pores. This study employs a hybrid approach that combines in situ synchrotron X-ray imaging with compressible multiphysics process simulation to elucidate pore-forming mechanisms during laser beam welding of copper. High-speed synchrotron X-ray imaging with an acquisition rate of 20,000 images/second facilitates the identification of relevant process regimes concerning pore formation during laser beam welding of copper with a wavelength of 1070 nm. Furthermore, in situ observations with high temporal and spatial resolution present a unique database for extensive validation of a multi-physics process simulation based on welding processes using different concentric intensity distributions. These validated simulation results enable thorough comprehension of process-related pore formation based on the interaction between keyhole, melt pool and resulting flow field. The findings show that pore formation is driven by four different mechanisms: bulging, spiking, upwelling waves at the keyhole rear wall and melt pool ejections. The synergy of high- speed synchrotron X-ray imaging and multi-physics modeling provides a fundamental understanding of the chronological sequence of events leading to process-related pore formation during laser beam welding of copper.}, language = {en} } @misc{SzyndlerSchmidtHaertel, author = {Szyndler, Joanna and Schmidt, Alexander and H{\"a}rtel, Sebastian}, title = {Determination of welding heat source parameters for fem simulation based on temperature history and real bead shape}, series = {Material Forming : The 26th International ESAFORM Conference on Material Forming, Krak{\´o}w, Poland, April 19-21, 2023}, journal = {Material Forming : The 26th International ESAFORM Conference on Material Forming, Krak{\´o}w, Poland, April 19-21, 2023}, edition = {28}, doi = {10.21741/9781644902479-18}, pages = {159 -- 168}, language = {en} } @misc{VinokurovaKnorrEfimovaetal., author = {Vinokurova, Ekaterina and Knorr, Monika and Efimova, Anastasia and Ovchinnikov, Alexander and Schmidt, Peer and B{\"u}chner, Bernd and Isaeva, Anna and Roslova, Maria}, title = {Microstructural evolution of layered K-doped RuCl3 during annealing traced by thermogravimetric analysis and 3D electron diffraction}, series = {Zeitschrift f{\"u}r Anorgische und Allgemeine Chemie}, volume = {649}, journal = {Zeitschrift f{\"u}r Anorgische und Allgemeine Chemie}, number = {19}, issn = {0044-2313}, doi = {10.1002/zaac.202300141}, pages = {1 -- 8}, abstract = {Nanoscale phase separation was induced in the K-doped RuCl3 van der Waals material by annealing, and studied with the goal to find a natural design strategy for the formation of two-dimensional architectures as an alternative to the costly and time-consuming experimental artificial growth methods. Phase conversion was traced by means of thermogravimetric analysis combined with mass spectrometry. The local crystal structure of co-existing K3Ru2Cl9 domains with the sizes of about 100 nm was solved by 3D electron diffraction.}, language = {en} } @techreport{BehrensKrimmFriesetal., author = {Behrens, Bernd-Arno and Krimm, Richard and Fries, Stefan and H{\"a}rtel, Sebastian and Schmidt, Alexander}, title = {Eigenschaften individuell gefertigter Bauteile f{\"u}r Umformanlagen}, address = {Hannover}, isbn = {978-3-86776-660-9}, pages = {103, XXI}, abstract = {Die Dauerschwingfestigkeit ist eine wichtige sowie f{\"u}r die Auslegung von zyklisch belasteten Bauteilen in Umformmaschinen notwendige Materialkenngr{\"o}ße. Diese Kenngr{\"o}ße ist nicht nur material- sondern auch fertigungsprozessabh{\"a}ngig. Aufgrund der rapiden Entwicklung von additiven Fertigungsanlagen und Werkstoffen mangelt es an hinreichenden Erfahrungswerten zu den Betriebseigenschaften von additiv gefertigten Bauteilen. Daher ist es wichtig, die Eignung von additiv gefertigten Bauteilen f{\"u}r Umformmaschinen im Vorfeld technologisch und wissenschaftlich zu untersuchen. Die Ermittlung der Dauerschwingfestigkeit von additiv gefertigten Komponenten f{\"u}r Umformmaschinen liefert außerdem einen Mehrwert f{\"u}r die konstruktive Auslegung anderer AM-Bauteile mit einem vergleichbaren Belastungskollektiv und erm{\"o}glicht eine Topologieoptimierung von Komponenten von Umformmaschinen. Im Rahmen dieses Forschungsvorhabens wurde die Dauerschwingfestigkeit additiv gefertigter Bauteile in Abh{\"a}ngigkeit von der Gesamtheit der Herstellungsparameter eines WAAM-Prozesses sowie diverser Nachbehandlungsmethoden erfolgreich anhand des Fallbeispiels Pleuel ermittelt. Außerdem wurde die Anwendbarkeit von WAAM-Prozessen zur Herstellung von individuellen Anlagenbauteilen f{\"u}r den Bereich Umformmaschinen erfolgreich belegt. Mit den ermittelten Dauerschwingfestigkeitswerten konnte eine Grundlage zur Auslegung weiterer AM-Bauteile mit vergleichbaren Belastungskollektiv sowie Topologieoptimierung genannter Bauteile geschaffen werden. Die Untersuchungen erfolgten an Laborproben geeigneter Geometrie in Bezug auf das Realbauteil und unter Gew{\"a}hrleistung der thermischen {\"U}bertragbarkeit auf Realbauteile. Abschließend ist mittels eines skalierten Demonstratorbauteils die Machbarkeit nachgewiesen worden.}, language = {de} } @misc{SchmidtJenschHaertel, author = {Schmidt, Alexander and Jensch, Felix and H{\"a}rtel, Sebastian}, title = {Multi-material additive manufacturing-functionally graded materials by means of laser remelting during laser powder bed fusion}, series = {Frontiers of Mechanical Engineering}, volume = {18}, journal = {Frontiers of Mechanical Engineering}, number = {4}, issn = {2095-0233}, doi = {10.1007/s11465-023-0765-z}, pages = {1 -- 11}, abstract = {Many processes may be used for manufacturing functionally graded materials. Among them, additive manufacturing seems to be predestined due to near-net shape manufacturing of complex geometries combined with the possibility of applying different materials in one component. By adjusting the powder composition of the starting material layer by layer, a macroscopic and step-like gradient can be achieved. To further improve the step-like gradient, an enhancement of the in-situ mixing degree, which is limited according to the state of the art, is necessary. In this paper, a novel technique for an enhancement of the in-situ material mixing degree in the melt pool by applying laser remelting (LR) is described. The effect of layer-wise LR on the formation of the interface was investigated using pure copper and low-alloy steel in a laser powder bed fusion process. Subsequent cross-sectional selective electron microscopic analyses were carried out. By applying LR, the mixing degree was enhanced, and the reaction zone thickness between the materials was increased. Moreover, an additional copper and iron-based phase was formed in the interface, resulting in a smoother gradient of the chemical composition than the case without LR. The Marangoni convection flow and thermal diffusion are the driving forces for the observed effect.}, language = {en} } @misc{JaegerSydowSchmidtetal., author = {J{\"a}ger, Reyk and Sydow, Benjamin and Schmidt, Alexander and Witt, Susanne and H{\"a}rtel, Sebastian}, title = {Design and Manufacturing of a Lightweight Press-Hardening Forming Tool by Wire Arc Additive Manufacturing}, series = {Proceedings of the 14th International Conference on the Technology of Plasticity - Current Trends in the Technology of Plasticity, Volume 3}, journal = {Proceedings of the 14th International Conference on the Technology of Plasticity - Current Trends in the Technology of Plasticity, Volume 3}, editor = {Mocellin, Katia}, publisher = {Springer}, isbn = {978-3-031-41340-7}, issn = {2195-4364}, doi = {10.1007/978-3-031-41341-4_25}, pages = {235 -- 246}, abstract = {Press-hardening is an important metal sheet manufacturing process to improve the metal sheet properties during forming with an inline quenching process. This requires higher cooling rates often obtained by cooling channels within the tools, that enable the formation of martensite for a high strength. The manufacturing of those forming tools with internal cooling channels is quite complex, time and material consuming and therefore expensive. Optimal cooling channel geometry cannot be realized by conventional machining operations, that limits cooling efficiency too. Wire Arc Additive Manufacturing (WAAM) is a layer-wise welding process, that allows the manufacturing of near net shapes and internal cooling channels. In contrast to conventional machining, manufacturing of a complex lightweight design forming tool can be realized by WAAM. This will further reduce the WAAM process time and material consumption. However, the lightweight design reduces on one hand the thermal mass and thus the capability of heat transfer, making cooling via the cooling channels more crucial. On the other hand, elastic tool deformation has to be as low as possible. In this study, a press-hardening forming tool made of S235JR is designed and manufactured by means of WAAM. FEM analysis are performed to optimize the design of the forming tool regarding lightweight aspects. Simple near net shapes of cooling channels are considered for a simplification of the WAAM process. The forming tool is mechanically tested to compare and evaluate the stiffness with the FEM analysis.}, language = {en} } @techreport{Schmidt, author = {Schmidt, Alexander}, title = {Verfahren zur Herstellung von funktional gradierten Multimaterial-Werkstoffen und Bauteile aus funktional gradierten Multimaterial-Werkstoffen}, pages = {1 -- 18}, abstract = {Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung funktional gradierter Multimaterial-Werkstoffe mittels eines additiven Fertigungsprozesses, bei welchem man nacheinander die folgenden Schritte durchf{\"u}hrt, n{\"a}mlich a) Bereitstellen einer Basis aus einem ersten Werkstoff, b) Aufbringen einer Schicht eines weiteren Werkstoffs auf der in Schritt a) bereitgestellten Basis, c) Schmelzen der in Schritt b) aufgebrachten Schicht des weiteren Werkstoffs unter Ausbildung eines additiv gefertigten Werkstoffs, d) Wiederaufschmelzen einer gew{\"u}nschten Schichtdicke des in Schritt c) additiv gefertigten Werkstoffs, e) Aufbringen einer weiteren Schicht eines weiteren Werkstoffs auf die Oberfl{\"a}che des in Schritt d) erhaltenen Werkstoffs, f) Schmelzen der in Schritt e) aufgebrachten Schicht unter Ausbildung eines additiv gefertigten Werkstoffs, g) Wiederaufschmelzen einer gew{\"u}nschten Schichtdicke des in Schritt f) additiv gefertigten Werkstoffs unter Ausbildung eines funktional gradierten Multimaterial-Werkstoffs. Weiterhin betrifft die vorliegende Erfindung einen mittels des erfindungsgem{\"a}ßen Verfahrens hergestellten funktional gradierten Multimaterial-Werkstoff und aus diesem Werkstoff hergestellte Bauteile.}, language = {de} } @misc{DiegelSchrickerSchmidtetal., author = {Diegel, Christian and Schricker, Klaus and Schmidt, Leander and Seibold, Marc and Friedmann, Hannes and Hellwig, Peter and Fr{\"o}hlich, Fabian and Nagel, Falk and Kallage, Peter and Rack, Alexander and Requardt, Herwig and Chen, Yunhui and Bergmann, Jean Pierre}, title = {In situ characterization of keyhole behavior and spatter formation in full penetration laser beam welding with local gas flow using high-speed synchrotron X-ray imaging}, series = {Optics \& laser technology}, volume = {191}, journal = {Optics \& laser technology}, publisher = {Elsevier BV}, address = {Amsterdam}, issn = {0030-3992}, doi = {10.1016/j.optlastec.2025.113367}, pages = {1 -- 17}, abstract = {Spatter formation is a major issue at welding speeds above 8 m/min for full penetration laser beam welding of high-alloyed steels. In experiments using a local gas flow directed at the keyhole rear wall, a reduction in spatter formation on the specimen top side was observed for welding of AISI 304. However, the interaction between gas flow and keyhole behavior with respect to the mechanisms and locations of spatter detachment, especially on the bottom side, is not yet fully understood. High-speed synchrotron X-ray imaging enables detailed insights into the keyhole behavior and the spatter formation to obtain a deeper understanding of the underlying mechanisms. During the reference experiments welding without shielding gas flow, the spatter detach from a melt pool swelling behind the keyhole aperture on both sides of the sheet. A gas flow with a low flow rate of 4.8 L/min reduces the spatter formation on the top side and the keyhole length due to the absence of oxygen affecting the surface tension. A swelling also forms on the keyhole front on the bottom side and small spatter detach undirected. Increasing the flow rate to 12.8 L/min elongates the keyhole, particularly on the specimen top side. The increased momentum transfer of the gas flow results in a periodic keyhole oscillation on the specimen top side. In combination with an elongated melt pool, the oscillation is directly correlated with the hump formation, caused by melt being pushed over the already solidified weld seam. In addition, spatter does not detach from the top side due to the changed melt flow and only detach from the keyhole front on the bottom side.}, language = {en} } @techreport{Schmidt, author = {Schmidt, Alexander}, title = {Verbesserung der Qualit{\"a}t von additiv gefertigten Bauteilen mittels Entwicklung bedarfsgerechter Strategien zur hybriden Nachprozessierung}, publisher = {Deutsches Patent- und Markenamt}, address = {M{\"u}nchen}, pages = {1 -- 15}, abstract = {Die Erfindung betrifft ein Verfahren zur Nachprozessierung von additiv gefertigten Komponenten oder hybrid gefertigten Komponenten. Hierf{\"u}r erfolgt zun{\"a}chst eine Bereitstellung einer ersten Komponente und einer zweiten Komponente durch ein additives Fertigungsverfahren. Auf die erste und/oder zweite Komponente wird eine Zwischenschicht aufgebracht. {\"U}ber die Zwischenschicht werden die erste Komponente und die zweite Komponente miteinander in Kontakt gebracht, sodass ein Zwischenbauteil erhalten wird. Ein TLP-Prozess und ein HIP-Prozess werden auf das Zwischenbauteil innerhalb einer Kammer in der genannten Reihenfolge angewendet.}, language = {de} } @techreport{SchmidtJensch, author = {Schmidt, Alexander and Jensch, Felix}, title = {Vorrichtung und Verfahren zur additiven Fertigung eines Bauteils aus einem Pulverbett}, publisher = {Deutsches Patent- und Markenamt}, address = {M{\"u}nchen}, pages = {10}, abstract = {Ein Verfahren zur additiven Fertigung eines Bauteils aus einem Pulverbett umfassend die folgenden Schritte: A) Bereitstellen eines Pulvermaterials; B) {\"U}berf{\"u}hren des Pulvermaterials unter Ausbildung eines Pulverbetts; C) Energieeintrag und/oder Auftragen des Bindemittels in das Pulverbett unter lokaler Verschmelzung und/oder lokaler Verklebung des Pulvermaterials des Pulverbetts zu einem Teilsegment des Bauteils; und mehrfache Wiederholung der Schritte B und C zur Fertigstellung des Bauteils, dadurch gekennzeichnet, dass das Pulvermaterial vor oder w{\"a}hrend des Schrittes C, also als Sch{\"u}ttung und/oder im geschmolzenen und/oder verklebten Zustand, durch Einbringung von K{\"o}rperschall, insbesondere durch Ultraschallbehandlung, konditioniert wird; sowie eine Vorrichtung zur additiven Fertigung.}, language = {de} } @misc{VeldkampSchmidtMarkwitzetal., author = {Veldkamp, Edzo and Schmidt, Marcus and Markwitz, Christian and Beule, Lukas and Beuschel, Ren{\´e} and Biert{\"u}mpfel, Andrea and Bischel, Xenia and Duan, Xiaohong and Gerjets, Rowena and G{\"o}bel, Leonie and Graß, R{\"u}diger and Guerra, Victor and Heinlein, Florian and Komainda, Martin and Langhof, Maren and Luo, Jie and Potthoff, Martin and Ramshorst, Justus G. V. van and Rudolf, Carolin and Seserman, Diana-Maria and Shao, Guodong and Siebicke, Lukas and Svoboda, Nikolai and Swieter, Anita and Carminati, Andrea and Freese, Dirk and Graf, Torsten and Greef, J{\"o}rg M. and Isselstein, Johannes and Jansen, Martin and Karlovsky, Petr and Knohl, Alexander and Lamersdorf, Norbert and Priesack, Eckart and Wachendorf, Christine and Wachendorf, Michael and Corre, Marife D.}, title = {Multifunctionality of temperate alley-cropping agroforestry outperforms open cropland and grassland}, series = {Communications Earth \& Environment}, volume = {4}, journal = {Communications Earth \& Environment}, number = {1}, publisher = {Springer Science and Business Media LLC}, issn = {2662-4435}, doi = {10.1038/s43247-023-00680-1}, pages = {10}, abstract = {AbstractIntensively managed open croplands are highly productive but often have deleterious environmental impacts. Temperate agroforestry potentially improves ecosystem functions, although comprehensive analysis is lacking. Here, we measured primary data on 47 indicators of seven ecosystem functions in croplands and 16 indicators of four ecosystem functions in grasslands to assess how alley-cropping agroforestry performs compared to open cropland and grassland. Carbon sequestration, habitat for soil biological activity, and wind erosion resistance improved for cropland agroforestry (P ≤ 0.03) whereas only carbon sequestration improved for grassland agroforestry (P \< 0.01). In cropland agroforestry, soil nutrient cycling, soil greenhouse gas abatement, and water regulation did not improve, due to customary high fertilization rates. Alley-cropping agroforestry increased multifunctionality, compared to open croplands. To ameliorate the environmental benefits of agroforestry, more efficient use of nutrients is required. Financial incentives should focus on conversion of open croplands to alley-cropping agroforestry and incorporate fertilizer management.}, language = {en} } @misc{SchrickerSchmidtNageletal., author = {Schricker, Klaus and Schmidt, Leander and Nagel, Falk and Diegel, Christian and Friedmann, Hannes and Seibold, Marc and Hellwig, Peter and Fr{\"o}hlich, Fabian and Kallage, Peter and Chen, Yunhui and Requardt, Herwig and Rack, Alexander and Bergmann, Jean Pierre}, title = {A comprehensive study on the influence of spatial power distribution on time-dependent keyhole behavior in laser beam welding of copper by means of high-speed synchrotron X-ray imaging}, series = {Optics \& laser technology}, volume = {192, Part E}, journal = {Optics \& laser technology}, publisher = {Elsevier BV}, address = {Amsterdam}, issn = {0030-3992}, doi = {10.1016/j.optlastec.2025.113999}, pages = {1 -- 15}, abstract = {This paper examines the impact of spatial power distributions on the time-dependent keyhole behavior during laser beam welding of copper using high-speed synchrotron X-ray imaging. The experimental setup utilized a COHERENT HighLight FL8000-ARM fiber laser with concentric intensity distribution created by an optical fiber cable. The European Synchrotron Radiation Facility (ESRF, beamline ID19) was used to conduct high-speed synchrotron imaging at 20,000 images per second to study the spatio-temporal keyhole behavior. Keyhole geometries were extracted through advanced image processing techniques, allowing quantification of parameters like depth, aperture, bulging, and determination of related oscillation frequencies. The results showed that core-dominated processes exhibit significant variations in keyhole geometry. In contrast, ring-dominated processes exhibited reduced penetration depths but increased melt pool dynamics due to altered absorption conditions and increased temperatures within the melt pool. A stabilized core-ring power distribution minimized fluctuations, resulting in improved process stability. The findings were summarized in a model concept describing three characteristic keyhole regimes: core-dominated, ring-dominated, and stabilized core-ring processes.}, language = {en} }