A5074293025- Advanced X-ray and CT Imaging
- Nuclear Physics and Applications
- Nuclear Materials and Properties
- Medical Imaging Techniques and Applications
- Advanced X-ray Imaging Techniques
- Additive Manufacturing Materials and Processes
- Polymer Foaming and Composites
- Additive Manufacturing and 3D Printing Technologies
- Nuclear reactor physics and engineering
- Energetic Materials and Combustion
- Electron and X-Ray Spectroscopy Techniques
- Ion-surface interactions and analysis
- Cellular and Composite Structures
- Mesoporous Materials and Catalysis
- High-pressure geophysics and materials
- Fusion materials and technologies
- X-ray Spectroscopy and Fluorescence Analysis
- Polymer composites and self-healing
- Force Microscopy Techniques and Applications
- Advanced Surface Polishing Techniques
- Supercapacitor Materials and Fabrication
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced MRI Techniques and Applications
- Advanced Battery Technologies Research
- High-Velocity Impact and Material Behavior
Los Alamos National Laboratory
2013-2024
Idaho National Laboratory
2019-2023
Massachusetts Institute of Technology
2023
Los Alamos Medical Center
2015
University of Alabama
2009-2011
The microstructure of plastic bonded explosives (PBXs) is known to influence behavior during mechanical deformation, but characterizing the can be challenging. For example, explosive crystals and binder in formulations such as PBX 9501 do not have sufficient X-ray contrast obtain three-dimensional data by situ, absorption imaging. To address this difficulty, we formulated a series PBXs using octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) low-density systems. binders were...
Meso-scale structure in polymeric foams determines the mechanical properties of material. Density variations, even more than variations anisotropic void structure, can greatly vary compressive and tensile response With their diverse use as both a structural material space filler, polyurethane (PU) are widely studied. In this manuscript, quantitative measures density provided by using micro X-ray computed tomography (microCT) to better understand results testing. MicroCT illustrates variation...
Multiple laboratory-based techniques including confocal XRF, which provides 3D elemental maps, have been used to nondestructively detect and characterize Pu in contaminated soil particles.
Abstract For lithium–sulfur battery commercialization, research at a pouch cell level is essential, as some problems that can be ignored or deemed minimal smaller have greater effect on the performance of larger cell. Herein, failure mechanisms Li–S cells are deeply investigated via in operando pressure analysis. It found highly porous structures cathodes/separators and slow electrolyte diffusion through both lead to poor initial wetting. Additionally, Li‐metal anode dominates thickness...
Tristructural isotropic (TRISO) coated fuel particles are a nuclear form under extensive study for use in advanced reactor concepts. TRISO fuels subjected to high temperature neutron irradiations and then examined assess their performance by determining fission product retention studying morphological changes. Micro X-ray computed tomography is one method of nondestructively the effects performance. This work addresses need image processing remove tomographic reconstruction artifacts that...
Three-dimensional X-ray computed tomography (CT) of in situ dynamic processes provides internal snapshot images as a function time. Tomograms are mathematically reconstructed from series radiographs taken rapid succession the specimen is rotated small angular increments. In addition to spatial resolution, temporal resolution important. Thus indicates how close together time two distinct tomograms can be acquired. allow detailed analyses that cannot obtained by other means. This article...
Detecting explosives without setting them off is, obviously, a prime goal in security applications. Avoiding detonation requires deep understanding of the complex, spatiotemporal interplay chemistry and heat transport heterogeneous solids. The authors combine three-dimensional structural data, dielectric simulations to study hot-spot formation thermal gradients energetic mesostructures under electromagnetic radiation. They find that enhanced light absorption at hot spots, below initiation...
Silicon carbide (SiC) ceramic matrix composite (CMC) cladding is currently being pursued as one of the leading candidates for accident-tolerant fuel (ATF) light water reactor applications. The morphology fabrication defects, including size and shape voids, key challenges that impacts performance guarantees safety. Therefore, quantification defects’ size, location, distribution, leak paths critical to determining SiC CMC in-core performance. This research aims provide quantitative insight...
ABSTRACT The use of an eight‐experiment Plackett–Burman method can assess six experimental variables and eight responses in a polysiloxane‐glass microsphere syntactic foam. approach aims to decrease the time required develop tunable polymer composite by identifying reduced set suitable for future predictive modeling. statistical design assesses main effects mixing process parameters, matrix composition, density volume loading, blending two grades microspheres, using dummy factor...
X-ray microscopy (XRM) has emerged as a powerful technique that reveals 3D images and quantitative information of interior structures. XRM executed both in the laboratory at synchrotron have demonstrated critical analysis materials characterization on meso-, micro-, nanoscales, with spatial resolution down to 50 nm systems. The non-destructive nature X-rays made widely appealing, potential for "4D" characterization, delivering micro- nanostructural same sample function sequential processing...
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