Timothy C. Petersen
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View article: Quantitative Structure Determination from Experimental Four-Dimensional Scanning Transmission Electron Microscopy via the Scattering Matrix
Quantitative Structure Determination from Experimental Four-Dimensional Scanning Transmission Electron Microscopy via the Scattering Matrix Open
Considerable inroads have recently been made on algorithms to determine the sample potential from four-dimensional scanning transmission electron microscopy data from thick samples where multiple scattering cannot be neglected. This paper …
View article: Quantitative Structure Determination from Experimental Four-Dimensional Scanning Transmission Electron Microscopy via the Scattering Matrix
Quantitative Structure Determination from Experimental Four-Dimensional Scanning Transmission Electron Microscopy via the Scattering Matrix Open
Considerable inroads have recently been made on algorithms to determine the sample potential from four-dimensional scanning transmission electron microscopy data from thick samples where multiple scattering cannot be neglected. This paper …
View article: Dopant site occupancy determined by core-loss-filtered, position-averaged convergent beam electron diffraction
Dopant site occupancy determined by core-loss-filtered, position-averaged convergent beam electron diffraction Open
In the elastic scattering regime, probe position-averaged convergent beam electron diffraction (PACBED) patterns have proven robust for estimating specimen thickness and mistilt. Through simulation, we show that core-loss-filtered PACBED p…
View article: Quantitative structure determination from experimental four-dimensional scanning transmission electron microscopy via the scattering matrix
Quantitative structure determination from experimental four-dimensional scanning transmission electron microscopy via the scattering matrix Open
Considerable inroads have recently been made on algorithms to determine the sample potential from four-dimensional scanning transmission electron microscopy data from thick samples where multiple scattering cannot be neglected. This paper …
View article: Measuring and mapping surface plasmons with nanometre scale resolution in the electron microscope
Measuring and mapping surface plasmons with nanometre scale resolution in the electron microscope Open
Electron energy-loss spectroscopy (EELS) has been used to observe the energy and distribution of surface plasmons at the nanometre scale. In addition, an entirely new method for imaging surface plasmons, based on phase retrieval methods, a…
View article: High-resolution X-ray scanning with a diffuse Huffman-patterned probe to reduce radiation damage
High-resolution X-ray scanning with a diffuse Huffman-patterned probe to reduce radiation damage Open
Scanning objects with a tightly focused beam (of photons or electrons for example) can provide high-resolution images. However, rapid deposition of energy into a small area can damage tissues in organic samples or may rearrange the chemica…
View article: Locating the Atoms at the Hard-soft Interface of Gold Nanoparticles
Locating the Atoms at the Hard-soft Interface of Gold Nanoparticles Open
Surface structure affects the growth, shape and properties of nanoparticles. In wet chemical syntheses, metal additives and surfactants are used to modify surfaces and guide nanocrystal growth. To understand this process, it is critical to…
View article: Unsupervised Deep Denoising for Low-Dose 4D-STEM
Unsupervised Deep Denoising for Low-Dose 4D-STEM Open
View article: Revealing local atomic re-arrangements in the shear-bands of deformed metallic glasses using scanning electron nano-diffraction
Revealing local atomic re-arrangements in the shear-bands of deformed metallic glasses using scanning electron nano-diffraction Open
View article: Symmetry Scanning Transmission Electron Microscopy using Segmented Detectors
Symmetry Scanning Transmission Electron Microscopy using Segmented Detectors Open
View article: Experimental Crystal Structure From 4D STEM via the Scattering Matrix
Experimental Crystal Structure From 4D STEM via the Scattering Matrix Open
View article: Burgers vector measurements in a structural glass from diffraction.
Burgers vector measurements in a structural glass from diffraction. Open
View article: High-resolution x-ray scanning with a diffuse, Huffman-patterned probe to minimise radiation damage
High-resolution x-ray scanning with a diffuse, Huffman-patterned probe to minimise radiation damage Open
Scanning objects with a more tightly focused beam (for example of photons or electrons) can provide higher-resolution images. However the stronger localisation of energy deposition can damage tissues in organic samples or may rearrange the…
View article: Unsupervised deep denoising for four-dimensional scanning transmission electron microscopy
Unsupervised deep denoising for four-dimensional scanning transmission electron microscopy Open
By simultaneously achieving high spatial and angular sampling resolution, four dimensional scanning transmission electron microscopy (4D STEM) is enabling analysis techniques that provide great insight into the atomic structure of material…
View article: Measurable geometric indicators of local plasticity in glasses
Measurable geometric indicators of local plasticity in glasses Open
The notion of defects in crystalline phases of matter has been extremely powerful for understanding crystal growth, deformation and melting. These discontinuities in the periodic order of crystals are mathematically described by the Burger…
View article: Differential phase contrast from electrons that cause inner shell ionization
Differential phase contrast from electrons that cause inner shell ionization Open
View article: Clustering of negative topological charges precedes plastic failure in 3D glasses
Clustering of negative topological charges precedes plastic failure in 3D glasses Open
The deformation mechanism in amorphous solids subjected to external shear remains poorly understood because of the absence of well-defined topological defects mediating the plastic deformation. The notion of soft spots has emerged as a use…
View article: Clustering of negative topological charge precedes plastic failure in 3D glasses
Clustering of negative topological charge precedes plastic failure in 3D glasses Open
The deformation mechanism in amorphous solids subjected to external shear remains poorly understood because of the absence of well-defined topological defects mediating the plastic deformation. The notion of soft spots has emerged as a use…
View article: Holography with an Extended Reference in Transmission Electron Microscopy
Holography with an Extended Reference in Transmission Electron Microscopy Open
View article: Families of multi-level Legendre-like arrays
Families of multi-level Legendre-like arrays Open
Families of new, multi-level integer 2 D arrays are introduced here as an extension of the well-known binary Legendre sequences that are derived from quadratic residues. We present a construction, based on Fourier and Finite Radon Transfor…
View article: Condylar motion analysis: a controlled, blinded clinical study on the interindividual reproducibility of standardized evaluation of computer-recorded condylar movements
Condylar motion analysis: a controlled, blinded clinical study on the interindividual reproducibility of standardized evaluation of computer-recorded condylar movements Open
The present study investigated to what extent a systematic evaluation of electronic condylar motion recordings leads to reproducible results in different examiners. The study was based on the anonymized condylar motion recordings of 20 pat…
View article: Resolution of Virtual Depth Sectioning from Four-Dimensional Scanning Transmission Electron Microscopy
Resolution of Virtual Depth Sectioning from Four-Dimensional Scanning Transmission Electron Microscopy Open
One approach to three-dimensional structure determination using the wealth of scattering data in four-dimensional (4D) scanning transmission electron microscopy (STEM) is the parallax method proposed by Ophus et al. (2019. Advanced phase r…
View article: The Effect of Dynamical Scattering on Single-plane Phase Retrieval in Electron Ptychography
The Effect of Dynamical Scattering on Single-plane Phase Retrieval in Electron Ptychography Open
Segmented and pixelated detectors on scanning transmission electron microscopes enable the complex specimen transmission function to be reconstructed. Imaging the transmission function is key to interpreting the electric and magnetic prope…
View article: Condylar motion analysis - a controlled, blinded clinical study on the interindividual reproducibility of standardized evaluation of computer- recorded condylar movements
Condylar motion analysis - a controlled, blinded clinical study on the interindividual reproducibility of standardized evaluation of computer- recorded condylar movements Open
Objectives The present study investigated to what extent systematic evaluation of electronic condylar motion recordings based on the Diagnostic Criteria for Dysfunction (DCD) leads to reproducible results in different examiners. Methods Th…
View article: Local symmetry predictors of mechanical stability in glasses
Local symmetry predictors of mechanical stability in glasses Open
The mechanical properties of crystals are controlled by the translational symmetry of their structures. But for glasses with a disordered structure, the link between the symmetry of local particle arrangements and stability is not well est…
View article: Factors limiting quantitative phase retrieval in atomic-resolution differential phase contrast scanning transmission electron microscopy using a segmented detector
Factors limiting quantitative phase retrieval in atomic-resolution differential phase contrast scanning transmission electron microscopy using a segmented detector Open
View article: Diffuse arrays that autocorrelate and project as delta-like points
Diffuse arrays that autocorrelate and project as delta-like points Open
Diffuse two-dimensional integer-valued arrays are demonstrated that have delta-like aperiodic autocorrelation and, simultaneously, the array sums form delta-like projections along several directions. The delta-projected views show a single…
View article: From Convergent Beam Electron Diffraction to 4D-STEM: New opportunities for revealing structure at the atomic scale
From Convergent Beam Electron Diffraction to 4D-STEM: New opportunities for revealing structure at the atomic scale Open
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View article: Extending the known families of scalable Huffman sequences
Extending the known families of scalable Huffman sequences Open
A canonical Huffman sequence is characterized by a zero inner-product between itself and each of its shifted copies, except at their largest relative shifts: their aperiodic auto-correlation then becomes delta-like, a single central peak s…
View article: Using Smartsheet to Track, Support, and Document Resident QI Activities
Using Smartsheet to Track, Support, and Document Resident QI Activities Open
In early 2020, personnel involved with the Anesthesiology Department’s quality assurance, residency, and research programs convened in an effort to address two pressing concerns. One of these was that Quality Improvement (QI) activities by…