Article
Microscopy
Gregory Sparks, Paul A. Shade, Michael D. Uchic, Stephen R. Niezgoda, Michael J. Mills, Mark Obstalecki
Summary: The study investigates the angular precision of crystal orientation determination using cross-correlation of dynamically simulated electron diffraction patterns with experimental patterns via spherical harmonic analysis. The best precision found is 0.016 degrees, with a noise floor for dislocation density calculations at approximately 5x10(13) m(-2) at a 200 nm step size. Compared to conventional Hough-transform indexing, the method used in the study provides superior precision and lower noise levels, even with high-quality patterns.
Review
Materials Science, Multidisciplinary
Juhi Sharma, Alexis Nicolay, Marc De Graef, Nathalie Bozzolo
Summary: The study found that using EBSD technique for phase identification of the grain boundary precipitates in VDM Alloy 780, comparing experimental and simulated patterns can partially overcome the issue of phase discrimination. Additionally, the advanced dictionary-based approach involving dynamic electron scattering event simulation identified the eta phase as the main component of these grain boundary precipitates.
MATERIALS CHARACTERIZATION
(2021)
Article
Computer Science, Artificial Intelligence
Gang Wu, Yunhui Shi, Xiaoyan Sun, Jin Wang, Baocai Yin
Summary: This study introduces a spherical measure based spherical image representation method along with corresponding resampling methods and spherical wavelet transform. The proposed approach demonstrates higher computational efficiency and better resampling results for spherical images, which is significant for multi-resolution analysis of spherical images.
IEEE TRANSACTIONS ON IMAGE PROCESSING
(2021)
Article
Mathematics, Applied
James Bremer, Ze Chen, Haizhao Yang
Summary: The algorithm presented in the article provides a new method for calculating forward and inverse spherical harmonic transforms efficiently. It has low time and memory costs, making it competitive for relatively small values of the transform order.
SIAM JOURNAL ON SCIENTIFIC COMPUTING
(2021)
Article
Materials Science, Multidisciplinary
A. Zieba, A. Jarzebska, A. Morawiec
Summary: The widely used electron backscatter diffraction (EBSD) mapping systems do not work well with materials that have non-crystallographic symmetries, which has limited the study of quasicrystals. However, using a commercial system to detect individual EBSD bands and an in-house software to index and determine orientations has proved to be effective. This approach was applied to study decagonal Al-Co-Ni and Al-Co quasicrystals, revealing differences in textures and microstructures.
MATERIALS CHARACTERIZATION
(2023)
Article
Meteorology & Atmospheric Sciences
Fukang Yin, Junqiang Song, Jianping Wu, Weimin Zhang
Summary: This article presents an implementation of single-precision fast spherical harmonic transform (SHT) in the YHGSM, exploring the potential of using single-precision arithmetic to accelerate fast SHT. Results show that single-precision fast SHT can improve computational efficiency without impacting forecast skill.
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Karim Louca, Hamidreza Abdolvand
Summary: The characterization of elastic strain and stress at the grain level is becoming important for validating numerical models, with an experiment conducted on a polycrystalline zirconium specimen to develop methods for reconstructing 3D grain maps and tracking individual grains. The results show accurate determination of small and big grains using 3D-XRD and over 80% accuracy in determining correct grain neighborhoods with the implemented Voronoi technique.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
S. Breumier, F. Adamski, J. Badreddine, M. Levesque, G. Kermouche
Summary: Research has found that shot peening of complex geometries can generate rolled edges, which exhibit higher hardening values and steeper hardening gradients. This is mainly attributed to higher dislocation densities around the rolled edge, leading to work hardening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Mathematics, Applied
Hranislav Stankovic
Summary: In this paper, we introduce the concept of spherical mean transform for operator pairs and extend it to a multivariable operator setting. We also study some properties of the transform, including the preservation of the Taylor spectrum and the conditions for preserving p-hyponormality of 2-variable weighted shifts.
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Huiyuan Sun, Thushara D. Abhayapala, Prasanga N. Samarasinghe
Summary: This paper introduces a time domain spherical harmonic decomposition algorithm developed for spatial audio processing in the context of active noise control. The algorithm processes microphone signals using pre-designed FIR filters to obtain continuous spatial information of the residual sound field, showing lower delay in numerical simulations compared to existing methods.
APPLIED SCIENCES-BASEL
(2021)
Article
Optics
Mikhail Rybin, Artem D. Sinelnik, Mohammad Tajik, Valentin A. Milichko, Evgenii Ubyivovk, Sergey A. Yakovlev, Alexander B. Pevtsov, Denis A. Yavsin, Dmitry A. Zuev, Sergey Makarov
Summary: Optical elements based on Ge-Sb-Te composition show great potential for tunable nanophotonics, characterized by non-volatile reversible phase transition and strong modulation of dielectric permittivity across a broad spectral range. Beside linear optical response control, switchable second harmonic generation from these nanoparticles is also demonstrated.
LASER & PHOTONICS REVIEWS
(2022)
Article
Engineering, Electrical & Electronic
Haobo Yuan, Jiansheng Jia, Ruixue Zhang
Summary: This paper proposes a method to accelerate the simulation of UAV swarm by neglecting coupling among UAVs and using Spherical Harmonic Transform. Results from a swarm of 6 UAVs show that the proposed method requires significantly less memory and is nearly 11 times faster than the traditional MLFMA method.
Article
Microscopy
Fulin Wang, McLean P. Echlin, Aidan A. Taylor, Jungho Shin, Benjamin Bammes, Barnaby D. A. Levin, Marc De Graef, Tresa M. Pollock, Daniel S. Gianola
Summary: A monolithic active pixel sensor based direct detector optimized for scanning electron microscope primary beam energies is used for electron back-scattered diffraction (EBSD) applications. The detector provides high detection efficiency and a large array of pixels, allowing sensitive and accurate detection of Kikuchi bands, with optimal contrast occurring in the 8-16 keV range. The diffraction pattern acquisition speed is greatly improved through sparse sampling mode and inpainting algorithms, while achieving high-speed EBSD mapping.
Article
Optics
Hui Zhao, Bing-Zhao Li
Summary: This study investigates the definition and relationship between the spherical linear canonical transform and spherical linear canonical Hankel transform in spherical polar coordinates. The relationship is derived based on the orthogonality of the spherical harmonics. Several essential properties of the proposed spherical linear canonical transform are obtained based on this relationship, including linearity, inversion formulas, shifts, and convolution theorems. Finally, potential applications of the spherical linear canonical transform are discussed.
Article
Physics, Mathematical
O. Costin, R. D. Costin, C. Ogle, M. Bevis
Summary: Spherical harmonic expansions (SHEs) play a crucial role in physical sciences, and this paper addresses the large order behavior and convergence domain of SHE coefficients, as well as the necessary and sufficient condition for convergence below the Brillouin sphere.
COMMUNICATIONS IN MATHEMATICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Stuart Wright, Saransh Singh, Marc De Graef
MICROSCOPY AND MICROANALYSIS
(2019)
Article
Materials Science, Multidisciplinary
Saransh Singh, William C. Lenthe, Marc De Graef
PHILOSOPHICAL MAGAZINE
(2019)
Article
Materials Science, Multidisciplinary
Leandro A. Santos, Saransh Singh, Anthony D. Rollett
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2019)
Article
Chemistry, Multidisciplinary
William Lenthe, Saransh Singh, Marc De Graef
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2019)
Article
Chemistry, Multidisciplinary
Saransh Singh, Prabhat Kc, Shivram Kashyap Sridhar, Marc De Graef
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2019)
Article
Chemistry, Multidisciplinary
Saransh Singh, Donald E. Boyce, Joel Bernier, Nathan R. Barton
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2020)
Article
Microscopy
Joseph Tessmer, Saransh Singh, Yejun Gu, Jaafar A. El-Awady, Marc De Graef
Article
Materials Science, Multidisciplinary
Yung Suk Jeremy Yoo, Anastasia Mullins, Sazol Has, DaeHoon Kang, Richard Hamerton, Saransh Singh, Marc De Graef, Josh Kacher
Summary: The influence of dispersoids and grain boundary characteristics on the crack propagation behavior in AA3xxx during deep drawing was investigated, with cracks typically forming on the material surface at the earliest stages of deformation and extending with increasing strain. The cracks propagated along intergranular paths with bifurcations correlating with triple junction locations, but no strong trends were identified linking grain boundary characteristics to crack propagation pathways. Dispersoids at grain boundaries were found to arrest crack propagation and divert crack growth pathways, demonstrating the first practical application of combining the dictionary indexing method with TKD analysis.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Physics, Applied
Amy L. Coleman, Saransh Singh, Cara E. Vennari, Raymond F. Smith, Travis J. Volz, Martin G. Gorman, Samantha M. Clarke, Jon H. Eggert, Federica Coppari, Dayne E. Fratanduono, Richard Briggs
Summary: This work presents a structural study of Ag under shock compression up to 331 GPa using laser shock compression. In situ x-ray diffraction is used to determine the structures of the resulting crystalline phases and the atomic distribution of the liquid state. The density of the liquid phase is determined for the first time in shock compressed Ag using structure factor analysis adapted for a non-monochromatic x-ray source. The crystalline phases show good agreement with previous experimental and theoretical works. Stacking faults in the face centered cubic structure are constrained using the whole powder pattern fitting approach. The study observes a transition from the ambient face centered cubic structure to a body-centered cubic structure and liquid phase at 179 GPa, with complete melting above 212 GPa.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Instruments & Instrumentation
Saransh Singh, Amy L. Coleman, Shuai Zhang, Federica Coppari, Martin G. Gorman, Raymond F. Smith, Jon H. Eggert, Richard Briggs, Dayne E. Fratanduono
Summary: This article describes a novel approach for performing quantitative structure-factor analysis and density measurements of liquids using X-ray diffraction with a pink-spectrum X-ray source. The methodology corrects for the pink beam effect by performing a Taylor series expansion of the diffraction signal. Various parameters such as mean density, background scale factor, peak X-ray energy, and cutoff radius for density measurement are estimated using a derivative-free optimization scheme. The proposed methodology is validated using simulated radial distribution function for tin and applied to experimental data on shock compressed tin, yielding densities that are consistent with other experimental results and the equations of state of tin.
JOURNAL OF SYNCHROTRON RADIATION
(2022)
Article
Physics, Applied
Melissa Sims, Richard Briggs, Travis J. Volz, Saransh Singh, Sebastien Hamel, Amy L. Coleman, Federica Coppari, David J. Erskine, Martin G. Gorman, Babak Sadigh, Jon Belof, Jon H. Eggert, Raymond F. Smith, June K. Wicks
Summary: Recent studies have shown that several metals undergo a transformation from face-centered cubic (fcc) to body-centered cubic (bcc) structure during shock compression. Experiments and simulations have revealed that this fcc to bcc transition occurs at high pressures and temperatures, and the bcc structure remains stable at even higher pressures.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Raymond F. Smith, Vinay Rastogi, Amy E. Lazicki, Martin G. Gorman, Richard Briggs, Amy L. Coleman, Carol Davis, Saransh Singh, David McGonegle, Samantha M. Clarke, Travis Volz, Trevor Hutchinson, Christopher McGuire, Dayne E. Fratanduono, Damian C. Swift, Eric Folsom, Cynthia A. Bolme, Arianna E. Gleason, Federica Coppari, Hae Ja Lee, Bob Nagler, Eric Cunningham, Philip Heimann, Richard G. Kraus, Robert E. Rudd, Thomas S. Duffy, Jon H. Eggert, June K. Wicks
Summary: Combining an x-ray free electron laser with a high-power laser driver allows for the study of equations-of-state, high strain-rate deformation processes, structural phase transitions, and transformation pathways under high pressure conditions. The results of shock compression and x-ray diffraction experiments on slurry targets provide valuable insights into the properties of embedded grains.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Condensed Matter
Anirudh Hari, Rohit Hari, Patrick G. Heighway, Raymond F. Smith, Thomas S. Duffy, Melissa Sims, Saransh Singh, Dayne E. Fratanduono, Cynthia A. Bolme, Arianna E. Gleason, Federica Coppari, Hae Ja Lee, Eduardo Granados, Philip Heimann, Jon H. Eggert, June K. Wicks
Summary: In this study, laser-driven shock compression experiments were conducted on polycrystalline alumina, and it was observed that the material undergoes a phase transformation at 107 GPa and reverts back upon release of pressure. The density upon release was lower than predicted, indicating lattice expansion due to plastic work heating. An estimate of alumina's strength upon release from shock compression was provided based on temperature values calculated from density measurements.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Dominique Chatain, Saransh Singh, Blandine Courtois, Jeremie Silvent, Elodie Verzeroli, Gregory S. Rohrer, Marc De Graef, Paul Wynblatt
Article
Materials Science, Multidisciplinary
Elissaios Stavrou, Michael Bagge-Hansen, Joshua A. Hammons, Michael H. Nielsen, Bradley A. Steele, Penghao Xiao, Matthew P. Kroonblawd, Matthew D. Nelms, William L. Shaw, Will Bassett, Sorin Bastea, Lisa M. Lauderbach, Ralph L. Hodgin, Nicholas A. Perez-Marty, Saransh Singh, Pinaki Das, Yuelin Li, Adam Schuman, Nicholas Sinclair, Kamel Fezzaa, Alex Deriy, Lara D. Leininger, Trevor M. Willey
Article
Microscopy
C. Gao, C. Hofer, T. J. Pennycook
Summary: Ptychography provides high dose efficiency images that can reveal light elements next to heavy atoms. However, contrast reversals can occur when the projected potential becomes strong. Recent research has shown that these reversals can be counteracted by adapting the focus. This study explains why the best contrast is often found with the probe focused to the middle of the sample and highlights the importance of convergence angle in thin samples to remove contrast reversals.
Article
Microscopy
J. Lindner, U. Ross, T. Meyer, V. Boureau, M. Seibt, Ch. Jooss
Summary: Phase-shifting electron holography is an excellent method with high phase sensitivity to reveal electron wave phase information. An advanced drift correction scheme is proposed in this study, which exploits the interface of the TEM specimen and the vacuum area in the hologram. This method allows for obtaining reliable phase information.
Article
Microscopy
Ali Jaberi, Nicolas Brodusch, Jun Song, Raynald Gauvin
Summary: This study investigates knock-on damage in lithium-ion batteries (LIBs) by computing threshold displacement energies (TDEs) and performing Monte Carlo simulation. The results indicate that Li is most sensitive to knock-on damage at moderate electron energies, and TDE is the principal parameter for assessing Li sensitivity to knock-on damage across similar structures.
Article
Microscopy
Alexander Schroeder, Christopher Rathje, Leon van Velzen, Maurits Kelder, Sascha Schaefer
Summary: This study utilizes novel event-based electron detector platforms to extend the temporal resolution of electron microscopy. By training a neural network to predict electron arrival time, the researchers were able to improve the timing accuracy and achieve a promising solution for enhancing electron timing precision in various electron microscopy applications.
Article
Microscopy
Avi Auslender, Nivedita Pandey, Amit Kohn, Oswaldo Dieguez
Summary: This article describes a faster implementation based on DFT for computing the mean inner potential of crystals, providing quantum-mechanical calculations beyond the independent-atom approximation. The study also reveals the dependence of the mean inner potential on sample boundary conditions, mass density, and magnetic susceptibility, highlighting its correlation with various material properties.
Article
Microscopy
Zhidong Yang, Dawei Zang, Hongjia Li, Zhao Zhang, Fa Zhang, Renmin Han
Summary: In this work, we propose a self-supervised deep learning model for cryo-ET volumetric image denoising based on noise modeling and sparsity guidance. Experimental results demonstrate that our method can achieve reliable denoising by training on single noisy volume and outperform existing methods.
Article
Microscopy
J. Kuttruff, J. Holder, Y. Meng, P. Baum
Summary: In this study, a robust clustering algorithm is proposed that can find clusters in a continuous stream of raw data in real time. This algorithm converts pixel hits measured by hybrid pixel detectors to real single-electron events. By continuously comparing with previous hits, the algorithm efficiently identifies the merging of new and old events.
Article
Microscopy
D. G. Senturk, C. P. Yu, A. De Backer, S. Van Aert
Summary: This article presents a statistics-based method for accurately counting the number of atoms in nanostructures, especially for images acquired with low electron doses and multiple element structures.
Article
Microscopy
Mauricio J. Prieto, Lucas de Souza Caldas, Liviu C. Tanase, Thomas Schmidt, Oscar Rodriguez de la Fuente
Summary: This study presents a synchrotron-based investigation of the synthesis process of a magnetite/hematite bilayer. Ion bombardment gradually transforms hematite into magnetite, and the growth of magnetite leads to the formation of stable boundaries. These findings are significant for understanding novel oxide heterostructures.
Article
Microscopy
Emre Yoruk, Holger Klein, Stephanie Kodjikian
Summary: Beam sensitive nanomaterials pose challenges for crystallographic structure determination. A dose symmetric electron diffraction tomography (DS-EDT) method is developed to reduce beam damage and obtain complete data sets by merging individual datasets from multiple crystals.
Article
Microscopy
A. Pofelski, Y. Zhu, G. A. Botton
Summary: The precision and sensitivity of the GPA method for strain characterization is a widely discussed topic. This study introduces the concept of phase noise and analyzes the parameter of sampling to improve the precision of GPA. Experimental and theoretical results demonstrate that using a larger pixel spacing in STEM can enhance the precision and sensitivity of the GPA method.
Article
Microscopy
Sangjun Kang, Di Wang, Christian Kuebel, Xiaoke Mu
Summary: Transmission electron microscopy is a valuable tool for assessing strain fields within materials. However, using thin specimens in TEM analysis can affect atomic configuration and deformation structure.