Zobrazeno 1 - 10 of 54 pro vyhledávání: '"Johannes Becher"'
1
GPU-accelerated coupled ptychographic tomography
Autor: Silvio Achilles, Simeon Ehrig, Nico Hoffmann, Maik Kahnt, Johannes Becher, Yakub Fam, Thomas Sheppard, Dennis Brückner, Andreas Schropp, Christian G. Schroer
Publikováno v: SPIE Optical Engineering + Applications, 14.10.2022, San Diego, USAProc. SPIE 12242, Developments in X-Ray Tomography XIV, 122420N
Scanning coherent X-ray microscopy (ptychography) has gained considerable interest during the last decade since the performance of this indirect imaging technique does not necessarily rely on the quality of the X-ray optics and, in principle, can ach
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d83c2055e2f36ed49490b5bf1933a95f
https://www.hzdr.de/publications/Publ-36632-1
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2
Fields with bounded Brauer 2-torsion index
Autor: Karim Johannes Becher
Publikováno v: Mathematische Annalen
It is shown that, over a field of characteristic not 2, the dimension of an anisotropic quadratic Pfister form of trivial total signature is at most twice the dimension of some central division algebra of exponent 2. The proof is based on computation
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9c323ad2286ac6ce34c66244aa267e8c
https://hdl.handle.net/10067/1942490151162165141
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4
Strong linkage for function fields of surfaces
Autor: Parul Gupta, Karim Johannes Becher
Publikováno v: Manuscripta mathematica
Over a global field any finite number of central simple algebras of exponent dividing m is split by a common cyclic field extension of degree m. We show that the same property holds for function fields of 2-dimensional excellent schemes over a hensel
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c49530d9332545495fa512251a03e03d
https://doi.org/10.1007/s00229-021-01301-x
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5
Chemical gradients in automotive Cu-SSZ-13 catalysts for NOx removal revealed by operando X-ray spectrotomography
Autor: Dmitry E. Doronkin, Debora Motta Meira, Thomas L. Sheppard, Deniz Zengel, Sakura Pascarelli, Dario Ferreira Sanchez, Johannes Becher, Jan-Dierk Grunwaldt
Publikováno v: Nature Catalysis. 4:46-53
Nitrogen oxide (NOx) emissions are a major source of pollution, demanding ever-improving performance from catalytic after-treatment systems. However, catalyst development is often hindered by limited understanding of the catalyst at work, exacerbated
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d82d3c98e78c489347f62928fadc220e
https://doi.org/10.1038/s41929-020-00552-3
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6
A versatile nanoreactor for complementary in situ X-ray and electron microscopy studies in catalysis and materials science
Autor: Thomas L. Sheppard, Martin Seyrich, Dennis Brueckner, Thomas F. Keller, Yakub Fam, Xiaogang Yang, Christian G. Schroer, Dennis Scherhaufer, Jan-Dierk Grunwaldt, Andreas Schropp, Satishkumar Kulkarni, Felix Wittwer, Maik Kahnt, Heinz Lambach, Johannes Becher, Arne Wittstock, Andreas Stierle
Publikováno v: Journal of Synchrotron Radiation
Journal of synchrotron radiation, 26 (5), 1769–1781
Journal of synchrotron radiation 26(5), 1769-1781 (2019). doi:10.1107/S160057751900660X
Journal of synchrotron radiation 26(5), 1769 - 1781 (2019). doi:10.1107/S160057751900660X
Two in situ `nanoreactors' for high-resolution imaging of catalysts have been designed and applied at the hard X-ray nanoprobe endstation at beamline P06 o
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d9b08d3a3f7b59e437e44ccc21c0051e
http://europepmc.org/articles/PMC6732905
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8
Tracking dynamic structural changes in catalysis by rapid 2D-XANES microscopy
Autor: Thomas L. Sheppard, Christian G. Schroer, Johannes Becher, Dmitry E. Doronkin, Saba Alizadehfanaloo, Jan Garrevoet, Vadim Murzin, Martin Seyrich, Jan-Dierk Grunwaldt, Andreas Schropp
Publikováno v: Journal of synchrotron radiation 28(5), 1518-1527 (2021). doi:10.1107/S1600577521007074
Journal of Synchrotron Radiation
Journal of synchrotron radiation, 28 (5)
Journal of synchrotron radiation 28(5), 1518 - 1527 (2021). doi:10.1107/S1600577521007074
Many processes and materials in heterogeneous catalysis undergo dynamic structural changes depending on their chemical environment. Monitoring such dynamic
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::07a6131971f08a9576a34f3039a8b907
https://bib-pubdb1.desy.de/record/463127
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9
Tomographic reconstruction with a generative adversarial network
Autor: Yakub Fam, Christian G. Schroer, Dennis Brückner, Thomas L. Sheppard, Johannes Becher, Maik Kahnt, Xiaogang Yang, Andreas Schropp, Jan-Dierk Grunwaldt
Publikováno v: Journal of synchrotron radiation, 27 (2), 486-493
Journal of synchrotron radiation 27(2), 486-493 (2020). doi:10.1107/S1600577520000831
Journal of Synchrotron Radiation
Journal of synchrotron radiation 27(2), 486 - 493 (2020). doi:10.1107/S1600577520000831
This paper presents a deep learning algorithm for tomographic reconstruction(GANrec). The algorithm uses a generative adversarial network (GAN) to solvethe i
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e519418b5a5b74e7df8454491c2b91cd
https://publikationen.bibliothek.kit.edu/1000115487
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10
Akademický článek
Rapid Restratification Processes Control Mixed Layer Turbulence and Phytoplankton Growth in a Deep Convection Region
Autor: Mariana Miracca‐Lage, Johannes Becherer, Lucas Merckelbach, Anthony Bosse, Pierre Testor, Jeffrey R. Carpenter
Publikováno v: Geophysical Research Letters, Vol 51, Iss 10, Pp n/a-n/a (2024)
Abstract The Gulf of Lion, Northwestern Mediterranean Sea, is one of few oceanic regions where deep convection occurs. We investigate the restratification following a convection event using measurements from an ocean glider equipped with turbulence m
Externí odkaz: https://doaj.org/article/f91b380f4e47402f8bdf04a95133b0da
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