Zobrazeno 1 - 10
of 985
pro vyhledávání: '"Stephan, O."'
Autor:
Sun, Yanwen, Carini, Gabriella, Chollet, Matthieu, Decker, Franz-Josef, Dunne, Mike, Fuoss, Paul, Hruszkewycz, Stephan O., Lane, Thomas J., Nakahara, Kazutaka, Nelson, Silke, Robert, Aymeric, Sato, Takahiro, Song, Sanghoon, Stephenson, G. Brian, Sutton, Mark, Van Driel, Tim B., Weninger, Clemens, Zhu, Diling
Publikováno v:
Phys. Rev. Lett. 127, 058001 (2021)
We report observations of nanosecond nanometer scale heterogeneous dynamics in a free flowing colloidal jet revealed by ultrafast x-ray speckle visibility spectroscopy. The nanosecond double-bunch mode of the Linac Coherent Light Source free electron
Externí odkaz:
http://arxiv.org/abs/2103.11231
Autor:
Kandel, Saugat, Maddali, S., Nashed, Youssef S G, Hruszkewycz, Stephan O, Jacobsen, Chris, Allain, Marc
The phase retrieval problem, where one aims to recover a complex-valued image from far-field intensity measurements, is a classic problem encountered in a range of imaging applications. Modern phase retrieval approaches usually rely on gradient desce
Externí odkaz:
http://arxiv.org/abs/2103.01767
In this communication, we discuss how 3D information about the structure of a crystalline sample is encoded in Bragg 3DXCDI measurements. Our analysis brings to light the role of the experimental parameters in the quality of the final reconstruction.
Externí odkaz:
http://arxiv.org/abs/2009.04301
This paper addresses three-dimensional signal distortion and image reconstruction issues in x-ray Bragg coherent diffraction imaging (BCDI) in the event of a general non-orthogonal orientation of the area detector with respect to the diffracted beam.
Externí odkaz:
http://arxiv.org/abs/2008.01843
Autor:
Siddharth Maddali, Travis D. Frazer, Nazar Delegan, Katherine J. Harmon, Sean E. Sullivan, Marc Allain, Wonsuk Cha, Alan Dibos, Ishwor Poudyal, Saugat Kandel, Youssef S. G. Nashed, F. Joseph Heremans, Hoydoo You, Yue Cao, Stephan O. Hruszkewycz
Publikováno v:
npj Computational Materials, Vol 9, Iss 1, Pp 1-12 (2023)
Abstract In this paper we demonstrated a method to reconstruct vector-valued lattice distortion fields within nanoscale crystals by optimization of a forward model of multi-reflection Bragg coherent diffraction imaging (MR-BCDI) data. The method flex
Externí odkaz:
https://doaj.org/article/b8ae45bef6654f389e0e4ae853ae0b0c
Autor:
Maddali, Siddharth, Li, Peng, Pateras, Anastasios, Timbie, Daniel, Delegan, Nazar, Crook, Alex, Lee, Hope, Calvo-Almazan, Irene, Sheyfer, Dina, Cha, Wonsuk, Heremans, F. Joseph, Awschalom, David D., Chamard, Virginie, Allain, Marc, Hruszkewycz, Stephan O.
In this two-part article series we provide a generalized description of the scattering geometry of Bragg coherent diffraction imaging (BCDI) experiments, the shear distortion effects inherent to the resulting three-dimensional (3D) image from current
Externí odkaz:
http://arxiv.org/abs/1909.05353
Autor:
Li, Peng, Maddali, Siddharth, Pateras, Anastasios, Calvo-Almazan, Irene, Hruszkewycz, Stephan O., Chamard, Virginie, Allain, Marc
X-ray Bragg coherent diffraction imaging has been demonstrated as a powerful three-dimensional (3D) microscopy approach for the investigation of sub-micrometer-scale crystalline particles. It is based on the measurement of a series of coherent diffra
Externí odkaz:
http://arxiv.org/abs/1909.05354
Autor:
Kawaguchi, Tomoya, Keller, Thomas F., Runge, Henning, Gelisio, Luca, Seitz, Christoph, Kim, Young Y., Maxey, Evan R., Cha, Wonsuk, Ulvestad, Andrew, Hruszkewycz, Stephan O., Harder, Ross, Vartanyants, Ivan A., Stierle, Andreas, You, Hoydoo
Publikováno v:
Phys. Rev. Lett. 123, 246001 (2019)
Bimetallic catalysts can undergo segregation or redistribution of the metals driven by oxidizing and reducing environments. Bragg coherent diffraction imaging (BCDI) was used to relate displacement fields to compositional distributions in crystalline
Externí odkaz:
http://arxiv.org/abs/1905.06271