A5071831042- Medical Imaging Techniques and Applications
- Advanced X-ray Imaging Techniques
- Seismic Imaging and Inversion Techniques
- Laser Design and Applications
- Advanced X-ray and CT Imaging
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Advanced Electron Microscopy Techniques and Applications
- Advanced Fiber Laser Technologies
- Spectroscopy and Laser Applications
- Liquid Crystal Research Advancements
- Quantum optics and atomic interactions
- Astrophysical Phenomena and Observations
- Photonic and Optical Devices
- Nuclear Physics and Applications
- Photorefractive and Nonlinear Optics
- Digital Holography and Microscopy
- Medical Image Segmentation Techniques
- Advanced Optical Imaging Technologies
- Image and Signal Denoising Methods
- CO2 Sequestration and Geologic Interactions
- Enhanced Oil Recovery Techniques
- Optical measurement and interference techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Atmospheric and Environmental Gas Dynamics
Argonne National Laboratory
2019-2024
Lomonosov Moscow State University
2023
X-ray Instrumentation Associates (United States)
2022
Lund University
2012-2020
MAX IV Laboratory
2018-2020
University of Chicago
2020
Faculty (United Kingdom)
2015-2016
Numerical Method (China)
2016
Japan External Trade Organization
2011-2012
Institute of Petroleum Geology and Geophysics
2012
Mining wastes or combustion ash are materials of high carbon sequestration potential but also known for their toxicity in terms heavy metal content. To utilize such waste engineered mineralization purposes, there is a need to investigate the fate and mobility toxic metals. This study coprecipitation metals with calcium carbonate environmental mitigation. The examines stability precipitated phases under environmentally relevant acid conditions. For wide range cadmium (Cd) zinc (Zn)...
Abstract In the last decade, transmission X‐ray microscopes (TXMs) have come into operation in most of synchrotrons worldwide. They proven to be outstanding tools for non‐invasive ex and situ 3D characterization materials at nanoscale across varying range scientific applications. However, their spatial resolution has not improved many years, while newly developed functional microdevices with enhanced performances exhibit nanostructures always finer. Here, optomechanical breakthroughs leading...
Abstract For proton exchange membrane fuel cells to be cost‐competitive in light‐ and heavy‐duty vehicle applications, their Pt content the catalyst layers needs lowered. However, lowering results voltage losses due high local oxygen transport resistances at ionomer–Pt interface. It is therefore crucial use ionomers that have higher permeability than Nafion. In this work, novel (HOPIs) are presented, with up five times Nafion, synthesized by copolymerization of...
Complex dynamic tomographic experiments at brilliant X-ray light sources require real-time feedback on the sample changes with respect to environmental conditions, selecting representative regions of interest for high-resolution scanning, and on-demand data saving mechanisms storing only relevant projections acquired by fast area detectors reducing volumes. Here implementation details a 3D imaging monitoring instrument, zooming volume easy-to-use visualization via ImageJ, tool familiar most...
Fast 3D data analysis and steering of a tomographic experiment by changing environmental conditions or acquisition parameters require fast, close to real-time, reconstruction large volumes. Here we present performance-optimized TomocuPy package as GPU alternative the commonly-used CPU-based TomoPy for reconstruction. utilizes modern hardware capabilities organize asynchronous involving parallel read-write operations with storage drives, CPU-GPU transfers, computations. In reconstruction, all...
Extrusion-based additive manufacturing (AM) of polymer composites exhibits complex thermally driven phenomena that introduce severe discontinuities in the internal structure across length scales, especially voids or porosity. This study utilizes a high-throughput porosity characterization technique to analyze large datasets from numerous micro-computed tomography (μCT) scans capture influence AM print parameters on size, shape, and location multiple layers (up few cm) fused granular...
X-ray nano-computed tomography (nano-CT) is an established method to obtain 3D spatial image information in static systems. This has enabled researchers access ever finer details of complex bulk structures various fields. Within Eath Science, this relevant for the study nanoporous formations, such as chalk, revealing pore network from which local petrophysical formation properties can be derived. Various dynamic processes are also occurring, or dependent on features at, nanoscale, like...
We present the extension of ptychography for three-dimensional object reconstruction in a tomography setting. describe alternating direction method multipliers (ADMM) as generic framework to efficiently solve nonlinear optimization problem. In this framework, ADMM breaks joint problem into two well-defined subproblems: ptychographic phase retrieval and tomographic reconstruction. paper, we use gradient descent algorithm both problems demonstrate efficiency proposed approach through numerical...
While the advances in synchrotron light sources, together with development of focusing optics and detectors, allow nanoscale ptychographic imaging materials biological specimens, corresponding experiments can yield terabyte-scale large volumes data that impose a heavy burden on computing platform. Graphical Processing Units (GPUs) provide high performance for such large-scale ptychography datasets, single GPU is typically insufficient analysis reconstruction. Several existing works have...
Miniaturized electronics suffer from a lack of energy autonomy. In that context, the fabrication lithium-ion solid-state microbatteries with high performance is mandatory for powering next generation portable electronic devices. Here, thin film positive electrode 3D Li-ion made by atomic layer deposition (ALD) method and in situ lithiation step demonstrated. The electrodes based on spinel LiMn2 O4 films operate at working potential (4.1 V vs Li/Li+ ) are capable delivering remarkable surface...
Fast multi-phase processes in methane hydrate bearing samples pose a challenge for quantitative micro-computed tomography study and experiment steering due to complex tomographic data analysis involving time-consuming segmentation procedures. This is because of the sample's multi-scale structure, which changes over time, low contrast between solid fluid materials, large amount acquired during dynamic processes. Here, hybrid approach proposed automatic from time-resolved imaging gas-hydrate...
Despite the increased brilliance of new generation synchrotron sources, there is still a challenge with high-resolution scanning very thick and absorbing samples, such as whole mouse brain stained heavy elements, and, extending further, brains primates. Samples are typically cut into smaller parts, to ensure sufficient X-ray transmission, scanned separately. Compared standard tomography setup where sample would be many pillars, laminographic geometry operates slab-shaped sections...
The Radon transform and its adjoint, the back-projection operator, can both be expressed as convolutions in log-polar coordinates. Hence, fast algorithms for application of these operators constructed by using FFT, if data is resampled at typically measured on an equally spaced grid polar coordinates, reconstructions are represented (as images) Cartesian Therefore, addition to several steps interpolation have conducted order apply operator means convolutions. However, comparison...
We introduce a Bayesian framework for the ptychotomographic imaging of 3D objects under photon-limited conditions. This approach is significantly more robust to measurement noise by incorporating prior information on probabilities object features and process into reconstruction problem, it can improve both temporal spatial resolution current future ptychography instruments. use alternating direction method multipliers solve proposed optimization where tomography subproblems are solved using...
Resolution level and reconstruction quality in nano-computed tomography (nano-CT) are part limited by the stability of microscopes, because magnitude mechanical vibrations during scanning becomes comparable to imaging resolution, ability samples resist beam damage data acquisition. In such cases, there is no incentive recovering sample state at different time steps like time-resolved methods, but instead goal retrieve a single highest possible spatial resolution without any artifacts. Here...