A5003087097- Advanced X-ray Imaging Techniques
- Medical Imaging Techniques and Applications
- Advanced X-ray and CT Imaging
- Electron and X-Ray Spectroscopy Techniques
- Catalytic Processes in Materials Science
- Advanced Electron Microscopy Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Pediatric Urology and Nephrology Studies
- Spacecraft and Cryogenic Technologies
- Catalysis and Oxidation Reactions
- Heat and Mass Transfer in Porous Media
- Civil and Structural Engineering Research
- Radiative Heat Transfer Studies
- Nuclear Physics and Applications
- Astrophysical Phenomena and Observations
- Machine Learning in Materials Science
- Enhanced Oil Recovery Techniques
- Public Administration and Political Analysis
- Hydrocarbon exploration and reservoir analysis
- Law and Political Science
- Petroleum Processing and Analysis
Karlsruhe Institute of Technology
2019-2023
Africa Center
2022
Bavarian State Library
2021
This paper presents a deep learning algorithm for tomographic reconstruction (GANrec). The uses generative adversarial network (GAN) to solve the inverse of Radon transform directly. It works independent sinograms without additional training steps. GAN has been developed fit input sinogram with model generated from predicted reconstruction. Good quality reconstructions can be obtained during minimization fitting errors. is self-training procedure based on physics model, instead data. showed...
Three-dimensional (3D) x-ray microscopy by ptychographic tomography requires elaborate numerical reconstructions.We describe a coupled ptychography-tomography reconstruction algorithm and apply it to an experimental computed data set of catalyst particle.Compared the traditional sequential algorithm, in which projections are reconstructed serve as input for subsequent tomographic reconstruction, reconstructs 3D volume with higher spatial resolution over larger field view.Coupling from...
Two in situ `nanoreactors' for high-resolution imaging of catalysts have been designed and applied at the hard X-ray nanoprobe endstation beamline P06 PETRA III synchrotron radiation source. The reactors house samples supported on commercial MEMS chips, were complementary ptychography (23 nm spatial resolution) transmission electron microscopy, with additional fluorescence measurements. allow pressures 100 kPa temperatures up to 1573 K, offering a wide range conditions relevant catalysis....
The hierarchical pore systems of Pt/Al2O3 exhaust gas aftertreatment catalysts were analyzed with a collection correlative imaging techniques to monitor changes induced by hydrothermal aging. Synergistic laboratory X-ray microtomography, synchrotron radiation ptychographic computed nanotomography, and electron tomography allowed quantitative observation the catalyst architecture from centimeter nanometer scale. Thermal aging at 750 °C in air 1050 10% H2O/air caused increasing structural...
Structure–activity relations in heterogeneous catalysis can be revealed through situ and operando measurements of catalysts their active state. While hard X-ray tomography is an ideal method for non-invasive, multimodal 3D structural characterization on the micron to nm scale, performing under controlled gas temperature conditions challenging. Here, we present a flexible sample environment at synchrotron radiation sources. The setup features are discussed, with demonstrations powder...
Many processes and materials in heterogeneous catalysis undergo dynamic structural changes depending on their chemical environment. Monitoring such can be challenging using conventional spectroscopic characterization tools, due to the high time resolution required. Here, a high-resolution 2D X-ray camera operating at 50 Hz full-frame rate was synchronized with QEXAFS monochromator, enabling rapid spectro-microscopic imaging contrast over individual pixels. This used monitor gradients within...
Scanning coherent X-ray microscopy (ptychography) has gained considerable interest during the last decade since performance of this indirect imaging technique does not necessarily rely on quality optics and, in principle, can achieve highest spatial resolution imaging. The method be easily extended to 3D by adding standard tomographic reconstruction schemes. However, is often applied a subsequent step using sequence aligned ptychographic 2D projections. In contribution, we outline current...
Die Daten wurden an der microXAS-Beamline Swiss Light Source (SLS, Villigen, Schweiz) im Juni 2019 aufgezeichnet. Gegenstand des Experiments war ein Zeolith-Katalysator auf Kupferbasis, als beschichteter Monolith hergestellt wurde. Eine detaillierte Beschreibung ist in Readme-Datei dieses Datensatzes und entsprechenden Publikation zu finden.
Three-dimensional X-ray microscopy by ptychographic tomography is usually per formed separating the steps of acquiring twodimensional reconstructed projection images at different angles and afterwards performing threedimensional tomographic reconstruction.Recently it has been suggested that those two separate can be coupled / joined together, allowing for sharing information between angular views during reconstruction step [1,2,3].We performed such a first time on an experimental dataset,...