Michael Drakopoulos
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View article: The Moving Beam Diffraction Geometry: the DIAD Application of a Diffraction Scanning-Probe
The Moving Beam Diffraction Geometry: the DIAD Application of a Diffraction Scanning-Probe Open
Understanding the interactions between microstructure, strain, phase, and material behavior is crucial in many scientific fields. However, quantifying these correlations is challenging, as it requires the use of multiple instruments and te…
View article: Acute Precursor of Retinal Ischemic Perivascular Lesion Identified on Optical Coherence Tomography B-Scans in Two Patients with Different Etiologies
Acute Precursor of Retinal Ischemic Perivascular Lesion Identified on Optical Coherence Tomography B-Scans in Two Patients with Different Etiologies Open
Purpose: To demonstrate optical coherence tomography (OCT) imaging findings of the acute hyperreflective retinal injury preceding retinal ischemic perivascular lesion (RIPL) formation in two patients with differing etiologies. Methods: Ret…
View article: Deformation and Degradation in 18650 Li‐Ion Cells Under Freeze‐Thaw Cycling
Deformation and Degradation in 18650 Li‐Ion Cells Under Freeze‐Thaw Cycling Open
Cylindrical 18650 cells are widely used in electric vehicles and space applications, where exposure to extreme temperature fluctuations is common. Repeated exposure to freezing and thawing cycles may accelerate electrode‐level degradation …
View article: In situ damage and deformation of Allende meteorite and tuff materials during synchrotron based high-speed 3D tomography.
In situ damage and deformation of Allende meteorite and tuff materials during synchrotron based high-speed 3D tomography. Open
View article: Ophthalmic Posterior Segment OCTA Metrics as Potential Biomarkers for Systemic Involvement in Systemic Sclerosis, Systemic Lupus Erythematosus, and Behçet Disease: A Systematic Review
Ophthalmic Posterior Segment OCTA Metrics as Potential Biomarkers for Systemic Involvement in Systemic Sclerosis, Systemic Lupus Erythematosus, and Behçet Disease: A Systematic Review Open
Ophthalmic posterior segment OCTA metrics may provide value in prognosis, stratification, and treatment monitoring of the examined rheumatologic conditions. These results warrant further study.
View article: Filament-Induced Failure in Lithium-Reservoir-Free Solid-State Batteries
Filament-Induced Failure in Lithium-Reservoir-Free Solid-State Batteries Open
Lithium-reservoir-free solid-state batteries can fail due to electrical shorting as a result of fracture and lithium metal filament formation. Mechanical stress at the solid electrolyte surface can induce fractures, which promote lithium f…
View article: Phase separation dynamics in sodium solid-state batteries with Na–K liquid anodes
Phase separation dynamics in sodium solid-state batteries with Na–K liquid anodes Open
Alkali metal anodes hold great promise for high-energy-density batteries for grid-scale applications.
View article: Elucidating the Discharge Behavior of Aqueous Zinc Sulfur Batteries in the Presence of Molybdenum(IV) Chalcogenide Catalyst: The Criticality of Interfacial Electrochemistry
Elucidating the Discharge Behavior of Aqueous Zinc Sulfur Batteries in the Presence of Molybdenum(IV) Chalcogenide Catalyst: The Criticality of Interfacial Electrochemistry Open
The aqueous zinc-sulfur battery holds promise for significant capacity and energy density with low cost and safe operation based on environmentally benign materials. However, it suffers from the sluggish kinetics of the conversion reaction…
View article: Precise Image-level Localization of Intracranial Hemorrhage on Head CT Scans with Deep Learning Models Trained on Study-level Labels
Precise Image-level Localization of Intracranial Hemorrhage on Head CT Scans with Deep Learning Models Trained on Study-level Labels Open
To prioritize the reading of noncontrast head CT scans with intracranial hemorrhage, this weakly supervised detection workflow was highly generalizable, with good interpretability, high positive predictive values at the study level, and pe…
View article: Adaptation to ex vivo culture reduces human hematopoietic stem cell activity independently of the cell cycle
Adaptation to ex vivo culture reduces human hematopoietic stem cell activity independently of the cell cycle Open
Loss of long-term hematopoietic stem cell (LT-HSC) function ex vivo hampers the success of clinical protocols that rely on culture. However, the kinetics and mechanisms through which this occurs remain incompletely characterized. In this s…
View article: Analysis of quantitative OCT and SS-OCTA metrics three months after initiation of intravitreal faricimab for treatment-recalcitrant neovascular AMD
Analysis of quantitative OCT and SS-OCTA metrics three months after initiation of intravitreal faricimab for treatment-recalcitrant neovascular AMD Open
Purpose To utilize optical coherence tomography (OCT) and SS-OCT angiography (SS-OCTA) for quantifying morphological changes seen in eyes with recalcitrant neovascular age-related macular degeneration (nAMD) transitioned to intravitreal fa…
View article: Exploring Diagnostic Precision and Triage Proficiency: A Comparative Study of GPT-4 and Bard in Addressing Common Ophthalmic Complaints
Exploring Diagnostic Precision and Triage Proficiency: A Comparative Study of GPT-4 and Bard in Addressing Common Ophthalmic Complaints Open
In the modern era, patients often resort to the internet for answers to their health-related concerns, and clinics face challenges to providing timely response to patient concerns. This has led to a need to investigate the capabilities of …
View article: Swept-source optical coherence tomography angiography metrics of retinal ischaemic perivascular lesions in patients being evaluated for carotid artery stenosis and controls
Swept-source optical coherence tomography angiography metrics of retinal ischaemic perivascular lesions in patients being evaluated for carotid artery stenosis and controls Open
Background/aims Retinal microvascular ischaemia may produce localised middle retinal disruption with corresponding scotoma, a phenomenon termed paracentral acute middle maculopathy (PAMM). Small chronic middle retinal atrophic lesions term…
View article: Effects of melt pool flow on porosity levels in arc welding
Effects of melt pool flow on porosity levels in arc welding Open
Arc welding is one of the widely used approaches for joining metals. During the arc welding process, an electric arc creates intense heat to fuse metals that forms the melt pool between the parts to be welded together. Intensive flow field…
View article: Adaptation to<i>ex vivo</i>culture drives human haematopoietic stem cell loss of repopulation capacity in a cell cycle independent manner
Adaptation to<i>ex vivo</i>culture drives human haematopoietic stem cell loss of repopulation capacity in a cell cycle independent manner Open
Loss of long-term haematopoietic stem cell function (LT-HSC) hampers the success of ex vivo HSC gene therapy and expansion procedures, but the kinetics and the mechanisms by which this occurs remain incompletely characterized. Here through…
View article: Practical implementations of speckle-based phase-retrieval methods in Python and GPU for tomography
Practical implementations of speckle-based phase-retrieval methods in Python and GPU for tomography Open
X-ray phase-contrast tomography (X-PCT) techniques are capable of imaging samples with small differences in densities. They enable scientists to study biological or medical samples using high energy X-rays, which means less X-ray absorptio…
View article: Flexible positioning of a large area detector using an industrial robot
Flexible positioning of a large area detector using an industrial robot Open
The DIAD beamline for Dual Imaging and Diffraction at Diamond Light Source has opted to use an industrial robot to position its Dectris Pilatus 2M CdTe diffraction detector. This setup was chosen to enable flexible positioning of the detec…
View article: X-Ray Imaging of Complex Flow Patterns during Tungsten Inert Gas Welding
X-Ray Imaging of Complex Flow Patterns during Tungsten Inert Gas Welding Open
Fusion welding techniques such as tungsten inert gas (TIG) welding process have been widely used in industrial and construction applications. The molten metal flow in the weld pool has a major impact on the microstructure evolution, chemic…
View article: Labeling Noncontrast Head CT Reports for Common Findings Using Natural Language Processing
Labeling Noncontrast Head CT Reports for Common Findings Using Natural Language Processing Open
Combining logistic regression with n-gram encoding is a robust approach to labeling common findings in noncontrast head CT reports.
View article: Optical Design of DEI/ABI System at the HEX Beamline at the NSLS-II
Optical Design of DEI/ABI System at the HEX Beamline at the NSLS-II Open
Diffraction Enhanced Imaging (DEI) or Analyzer Based Imaging (ABI) uses a perfect crystal monochromator and matching analyzer to achieve sensitivity to x-ray refraction and ultra small-angle scattering on the order of 0.01 micro-radians. A…
View article: Beamline K11 DIAD: a new instrument for dual imaging and diffraction at Diamond Light Source
Beamline K11 DIAD: a new instrument for dual imaging and diffraction at Diamond Light Source Open
The Dual Imaging and Diffraction (DIAD) beamline at Diamond Light Source is a new dual-beam instrument for full-field imaging/tomography and powder diffraction. This instrument provides the user community with the capability to dynamically…
View article: Mapping flow evolution in gas tungsten arc weld pools
Mapping flow evolution in gas tungsten arc weld pools Open
The complex flow within the molten metallic pool, during advanced manufacturing and joining processes such as welding and additive manufacturing, directly affects the performance of the final components; through the generation of various m…
View article: Data processing methods and data acquisition for samples larger than the field of view in parallel-beam tomography
Data processing methods and data acquisition for samples larger than the field of view in parallel-beam tomography Open
Parallel-beam tomography systems at synchrotron facilities have limited field of view (FOV) determined by the available beam size and detector system coverage. Scanning the full size of samples bigger than the FOV requires various data acq…
View article: Direct observation of the dynamic evolution of precipitates in aluminium alloy 7021 at high strain rates via high energy synchrotron X-rays
Direct observation of the dynamic evolution of precipitates in aluminium alloy 7021 at high strain rates via high energy synchrotron X-rays Open
The EPSRC are thanked for financial support through the associated programme grant LightFORM (EP/R001715/1) and EP/P02680X/1. Diamond Light Source (UK) is acknowledged for granting beam time to undertake the experiments at beamline I12 (EE…
View article: Characterizing Hidden Structures at NSLS-II: Strongly Correlated Electron Systems, Functional Ceramics, Batteries, and Beyond
Characterizing Hidden Structures at NSLS-II: Strongly Correlated Electron Systems, Functional Ceramics, Batteries, and Beyond Open
Brookhaven National Laboratory (New York) launched its highenergy X-ray science program at the inception of the National Synchrotron Light Source (NSLS), a U.S. Department of Energy (DOE) Office of Science User Facility. Built in the 1980s…
View article: Radioactive Material Dynamics @ NSLS-II [Slides]
Radioactive Material Dynamics @ NSLS-II [Slides] Open
RMD @ NSLS-II helps pave the path to a DMMSC: Developing expertise in techniques and experimental methods for DMMSC science; Improving capabilities for models to become microstructurally aware; Workforce training and development; Help refi…
View article: In situ X-ray observations of transient states in arc weld pools
In situ X-ray observations of transient states in arc weld pools Open
Metallic alloys coalesce via extremely rapid melting and subsequent solidification to form fusion welded joints. The melt pool evolution in melting and solidification sequences during the welding process determines the formation of the fin…
View article: Time evolved force domination in arc weld pools
Time evolved force domination in arc weld pools Open
View article: Analysis by synchrotron X-ray scattering of the kinetics of formation of an Fe-based metal-organic framework with high CO2 adsorption
Analysis by synchrotron X-ray scattering of the kinetics of formation of an Fe-based metal-organic framework with high CO2 adsorption Open
Understanding the mechanism of assembly and function of metal-organic frameworks (MOFs) is important for the development of practical materials. Herein, we report a time-resolved diffraction analysis of the kinetics of formation of a robus…
View article: Preprocessing techniques for removing artifacts in synchrotron-based tomographic images
Preprocessing techniques for removing artifacts in synchrotron-based tomographic images Open
X-Ray parallel-beam micro-tomography systems at synchrotron facilities are mainly bespoke designs. Technical problems from a detector system can strongly affect the quality of reconstruction results. Radial lens distortion in the visible l…