A5007297073- Advanced X-ray Imaging Techniques
- Medical Imaging Techniques and Applications
- GaN-based semiconductor devices and materials
- Cell Image Analysis Techniques
- Ga2O3 and related materials
- Advanced Electron Microscopy Techniques and Applications
- Functional Brain Connectivity Studies
- Semiconductor materials and devices
- Advanced Fluorescence Microscopy Techniques
- Silicon Carbide Semiconductor Technologies
- Electron and X-Ray Spectroscopy Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear Physics and Applications
- Advanced X-ray and CT Imaging
- Electronic Packaging and Soldering Technologies
- Digital Holography and Microscopy
- Chalcogenide Semiconductor Thin Films
- X-ray Diffraction in Crystallography
- Advanced Neuroimaging Techniques and Applications
- ZnO doping and properties
- Laser-Plasma Interactions and Diagnostics
- Medical Image Segmentation Techniques
- Supercapacitor Materials and Fabrication
- Seismic Imaging and Inversion Techniques
- Copper Interconnects and Reliability
Argonne National Laboratory
2020-2022
Nanjing University of Posts and Telecommunications
2022
Northwestern University
2016-2021
Xidian University
2011-2021
Brookhaven National Laboratory
2021
National University of Singapore
2015
Oak Ridge National Laboratory
2009
Harbin Electric Corporation (China)
2008
X-rays offer high penetration with the potential for tomography of centimetre-sized specimens, but synchrotron beamlines often provide illumination that is only millimetres wide. Here an approach demonstrated termed Tomosaic tomographic imaging large samples extend beyond field view X-ray system. This includes software modules image stitching and calibration, while making use existing available in other packages alignment reconstruction. The compatible conventional beamline hardware,...
X-ray ptychography is becoming the standard method for sub-30 nm imaging of thick extended samples. Available algorithms and computing power have traditionally restricted sample reconstruction to 2D slices. We build on recent progress in optimization high performance solve ptychographic phase retrieval problem directly 3D. Our approach addresses samples that do not fit entirely within depth focus system. Such pose additional challenges because internal diffraction effects sample. demonstrate...
Conventional tomographic reconstruction algorithms assume that one has obtained pure projection images, involving no within-specimen diffraction effects nor multiple scattering. Advances in x-ray nanotomography are leading toward the violation of these assumptions, by combining high penetration power x-rays, which enables thick specimens to be imaged, with improved spatial resolution decreases depth focus imaging system. We describe a method where scattering and samples modeled multislice...
A reverse-blocking AlGaN/GaN metal-insulator-semiconductor high electron mobility transistor (RB-MISHEMT) is proposed and fabricated. Compared with the conventional MISHEMT ohmic drain, device features a hybrid Schottky-ohmic drain low work function Tungsten (W), based on which state-of-the-art ultralow turn-on voltage ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${V} _{\mathrm{ on}}$...
The penetration power of x rays allows one to image large objects, while their short wavelength for high spatial resolution. As a result, with synchrotron sources, has the potential obtain tomographic images centimeter-sized specimens sub-micrometer pixel sizes. However, limitations on beam and detector size make it difficult acquire such data this sort in single take, necessitating strategies combining from multiple regions. One strategy is tiled set local tomograms by rotating specimen...
Neural microarchitecture is heterogeneous, varying both across and within brain regions. The consistent identification of regions interest one the most critical aspects in examining neurocircuitry, as these structures serve vital landmarks with which to map pathways. Access continuous, three-dimensional volumes that span multiple areas not only provides richer context for identifying such landmarks, but also enables a deeper probing microstructures within. Here, we describe X-ray...
We describe and demonstrate an optimization-based X-ray image reconstruction framework called Adorym. Our provides a generic forward model, allowing one code to be used for wide range of imaging methods ranging from near-field holography fly-scan ptychographic tomography. By using automatic differentiation optimization, Adorym has the flexibility refine experimental parameters including probe positions, multiple hologram alignment, object tilts. It is written with strong support parallel...
Abstract Imaging is a dominant strategy for data collection in neuroscience, yielding stacks of images that often scale to gigabytes single experiment. Machine learning algorithms from computer vision can serve as pair virtual eyes tirelessly processes these images, automatically detecting and identifying microstructures. Unlike methods, our Flexible Learning-free Reconstruction Imaged Neural volumes (FLoRIN) pipeline exploits structure-specific contextual clues requires no training. This...
A lateral Schottky barrier diode (SBD) on p-GaN/AlGaN/GaN heterostructure with arrayed p-GaN islands termination (API-SBD) is proposed and investigated in this work. On the basis of unique design approach, API-SBD presents a reduced reverse leakage current ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${I}_{R}$ </tex-math></inline-formula> ) one order magnitude lower than that counterpart SBD only...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> This letter presents a novel banknote image processing system that includes recognition, general attrition evaluation, and feature identification, in which the phenomenon of deterioration is discussed detail for first time. To compare sensed with its reference, registration algorithm based on free-form deformations model (FFD) proposed, homogeneity-based energy (BDE) used as cost function. The...
The degradation mechanism of enhancement-mode AlGaN/GaN high electron mobility transistors (HEMTs) fabricated by fluorine plasma ion implantation technology is one major concern HEMT's reliability. It observed that the threshold voltage shows a significant negative shift during typical long-term on-state gate overdrive stress. does not originate from presence as-grown traps in AlGaN barrier layer or generated process. By comparing relationships between and cumulative injected electrons under...
Different studies in X-ray microscopy have arrived at conflicting conclusions about the dose efficiency of imaging modes involving recording intensity distributions near (Fresnel regime) or far (Fraunhofer field downstream a specimen. A numerical study is presented on near-field holography, ptychography and far-field ptychography, where involves multiple overlapping finite-sized illumination positions. Unlike what has been reported for coherent diffraction imaging, which single pattern, it...
A monolithic bidirectional switch based on anti-paralleled two reverse blocking p-GaN HEMTs has been proposed and demonstrated in this work. The recessed Schottky drain technique is utilized to effectively reduce the on-state voltage thus lowering power loss of switches. significant reduction parasitic elements area obtained by integration. fabricated exhibits a threshold ~1.85 V, ~0.63 forward off-state breakdown voltages ~650 V at I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Given a data graph G, source vertex u and target v of reachability query, the query is used to answer whether there exists path from in G. Reachability processing one fundamental operations management, which widely biological networks, communication social networks assist analysis. The graphs practical applications usually contain information such as quantization weights associated with structural relationships, addition relationships between vertices. Thus, traditional users may want...
Ptychography is a powerful imaging technique that used in variety of fields, including materials science, biology, and nanotechnology. However, the accuracy reconstructed ptychography image highly dependent on recorded probe positions which often contain errors. These errors are typically corrected jointly with phase retrieval through numerical optimization approaches. When error accumulates along scan path or when magnitude large, these approaches may not converge satisfactory result. We...
Exponential increases in data volumes and velocities are overwhelming finite human capabilities. Continued progress science engineering demands that we automate a broad spectrum of currently manual research manipulation tasks, from transfer sharing to acquisition, publication, analysis. These needs particularly evident large-scale experimental science, which researchers typically granted short periods instrument time must maximize experiment efficiency as well output quality accuracy. To...
Increases in X-ray brightness from synchrotron light sources lead to a requirement for higher frame rates hybrid pixel array detectors (HPADs), while also favoring charge integration over photon counting. However, transfer of the full uncompressed data will begin constrain detector design, as well limit achievable continuous rate. Here compression scheme that is easy implement HPAD's application-specific integrated circuit (ASIC) described, and how different degrees affect image quality...