A5101623460- High-pressure geophysics and materials
- Advanced X-ray Imaging Techniques
- Geological and Geochemical Analysis
- Diamond and Carbon-based Materials Research
- Advanced X-ray and CT Imaging
- earthquake and tectonic studies
- Advanced Electron Microscopy Techniques and Applications
- Medical Imaging Techniques and Applications
- Thermal Expansion and Ionic Conductivity
- X-ray Diffraction in Crystallography
- Crystallography and molecular interactions
- Domain Adaptation and Few-Shot Learning
- Magnetic and transport properties of perovskites and related materials
- Geomagnetism and Paleomagnetism Studies
- Crystallography and Radiation Phenomena
- Quantum, superfluid, helium dynamics
- Image Processing Techniques and Applications
- Advanced Chemical Physics Studies
- Particle Accelerators and Free-Electron Lasers
- Multimodal Machine Learning Applications
- Force Microscopy Techniques and Applications
- Viral Infections and Outbreaks Research
- Educational Technology and Assessment
- Lanthanide and Transition Metal Complexes
- Ophthalmology and Visual Impairment Studies
Center for High Pressure Science and Technology Advanced Research
2013-2025
Shenyang Institute of Engineering
2024
Huazhong University of Science and Technology
2023
Wuhan National Laboratory for Optoelectronics
2023
Jilin University
2016-2021
Tianjin University
2018-2020
Center for High Pressure Science & Technology Advanced Research
2019
Carnegie Institution for Science
2012-2018
Geophysical Laboratory
2013-2017
Xinyang College of Agriculture and Forestry
2013
Transmission X-ray microscopy (TXM) has been well recognized as a powerful tool for non-destructive investigation of the three-dimensional inner structure sample with spatial resolution down to few tens nanometers, especially when combined synchrotron radiation sources. Recent developments this technique have presented need new tools both system control and data analysis. Here software package developed in MATLAB script command generation analysis TXM is presented. The first toolkit,...
Significance Diamond anvil cell (DAC) could be one of the most popular and versatile devices to generate static high pressure. By using beveled anvils, researchers can study materials up 4 Mbar, which is considered as a limit pressure conventional DAC; however, very few experiments have visited this region. Here, we systematically studied behaviors three DACs with typical culet sizes, reached Mbar. In addition, by submicrometer synchrotron X-ray probe, double cupping diamond anvils Mbar...
Cordycepin, a major compound separated from Cordyceps sinensis, is known as potential novel candidate for cancer therapy. Breast cancer, the most typical diagnosed among women, remains global health problem. In this study, anti-breast property of cordycepin and its underlying mechanisms was investigated. The direct effects on breast cells both in vitro vivo experiments were evaluated. Cordycepin exerted cytotoxicity MCF-7 MDA-MB-231 confirmed by reduced cell viability, inhibition...
A fast discrete curvelet transform based focus-stacking algorithm for extending the depth of focus a transmission x-ray microscope (TXM) is presented. By analyzing an image stack sample taken in Z-scan, fully in-focus can be generated by proposed scheme. With extended focus, it possible to obtain 3D structural information over large volume at nanometer resolution. The method has been demonstrated using dataset with laboratory source TXM system. possibility and limitations generalizing this...
Diamond anvil cell techniques have been improved to allow access the multimegabar ultrahigh-pressure region for exploring novel phenomena in condensed matter. However, only way determine crystal structures of materials above 100 GPa, namely, X-ray diffraction (XRD), especially low Z materials, remains nontrivial region, even with availability brilliant synchrotron sources. In this work, we perform a systematic study, choosing hydrogen (the lowest scatterer) as subject, understand how better...
ABSTRACT Transmission X‐ray microscopy (TXM) is a rapidly developing technique with the capability of nanoscale three dimensional (3D) real‐space imaging. Combined wide range in energy tunability from synchrotron sources, TXM enables retrieval 3D microstructural information elemental/chemical sensitivity that would otherwise be inaccessible. The differential absorption contrast above and below edges has been used to reconstruct distributions different elements, assuming interested elements...
Seifertite SiO2 likely exists as a minor phase near the core–mantle boundary. By simulating pressure and temperature conditions boundary, seifertite was synthesized in coarse-grained, polycrystalline sample coexisting with (Mg,Fe)SiO3 post-perovskite (pPv) at 129 GPa 2500 K. Here we report first situ single-crystal structure determination refinement of high after quench from laser heating. We improved data coverage diamond-anvil cell (DAC) by merging six selected grains that had different...
Significance Pressure-induced metallization of solid hydrogen is a problem certain prominence in high-pressure physics. However, it extremely challenging to be achieved experimentally. It was proposed that “chemical precompression” (introducing impurity atoms or molecules into hydrogen) may facilitate under pressure. In this paper, we selected Ar(H 2 ) as model system and explored the intermolecular interactions H presence weakly bound (Ar). Combining our experimental data theoretical...
Abstract Earth’s lower mantle is a potential water reservoir. The physical and chemical properties of the region are in part controlled by Fe 3+ /ΣFe ratio total iron content bridgmanite. However, effect on chemistry bridgmanite remains unclear. We carry out laser-heated diamond anvil cell experiments under hydrous conditions observe dominant 2+ (Mg, Fe)SiO 3 above 105 GPa normal geotherm corresponding to depth > 2300 km, whereas -rich obtained at pressures. further FeO coexistence with...
An iterative method has been developed to improve the quality of 3D tomography data with limited angular access. Within 10 iteration cycles, reconstructed error can be improved by an order magnitude and reach below 1%. This algorithm was applied high pressure collected in a panoramic diamond anvil cell transmission x-ray microscopy technique, which only 135° obtained. We found that volumes measured for tin (Sn) particle across β–Sn body-centered-tetragonal (bct) phase transition match...
Colossal negative thermal expansion was recently discovered in BiNiO3 associated with a low density to high phase transition under pressure. The varying proportion of co-existing phases plays key role the macroscopic behavior this material. Here, we utilize developed X-ray Absorption Near Edge Spectroscopy Tomography method and resolve mixture high/low pressure as function at tens nanometer resolution taking advantage charge transfer during transition. This five-dimensional (X, Y, Z, energy,...
Metallization of hydrogen as a key problem in modern physics is the pressure-induced evolution electronic band from wide-gap insulator to closed gap metal. However, due its remarkably high energy, insulating has never before been directly observed under pressure. Using high-brilliance, high-energy synchrotron radiation, we developed an inelastic x-ray probe yield information situ pressures diamond-anvil cell. The dynamic structure factor was measured over large energy range 45 eV. found...
The interactions between X-ray and the sample crystals were investigated, influence of small angle scattering on images was emphatically analyzed in diffraction enhanced imaging this paper. Not only additional noise term caused by introduced, more general DEI equation established, but also expressions absorption contrast, extinction contrast refraction given for peak image middle slope image. With new equation, contrasts two kinds resultant (apparent image) discussed.
In this work,we make a theoretical analysis of X_ray grating phase contrast imaging (XGPCI) and give an equation to show the relationship between transmittance relative shift two gratings,which was named as curve.According equation,we develop new method retrieve information from experimental data in theory.Finally,we analyze influence setup resolution image.
<title>Abstract</title> Crystallographic evolution of hydrogen under multi-megabar compression is a key problem in condensed-matter physics and unsolved challenge for experimentalists theoreticians. Although dozens crystal structures have been proposed by theory, only one, the simple hexagonal-close-packed (hcp) structure, has previously confirmed experiments. Utilizing new-generation synchrotron nano-focused X-ray probes developed micron-sized crystals at pressures above 212 GPa, we are...
A new x_ray imaging technique, diffraction_enhanced imaging, has been recently developed in Beijing Synchrotron Radiation Facility(BSRF). Diffraction_enhanced i maging is a radiographic technique that derives contrast from an object’s absor ption, refraction gradient and small_angle scatter properties(extinction). This method may improve image quality for medical applications, industrial ra diography non_destructive testing computed tomography.
Owing to the limitations of printed stereoacuity tests, effects luminance and contrast on stereopsis have not yet been sufficiently investigated, despite its important implications in designing measuring instruments, particularly for electronic devices. A measurement system was established using two 4 K smartphones a phoropter evaluate variations test. Seventeen young subjects with normal visual acuity were recruited. Two types test symbols, contour-based random-dot-based, used experiment....
Diffraction_enhanced imaging by using two crystals has been recently developed i n x_ray topogrphy station in Beijing Synchrotron Radiation Facility. In this art icle the analysis for influence of thermal expansion first crysta l on diffraction enhanced is presented. The conclusion that nfluence crystal can be avoided and much b etter images obtained when axes are placed vertically to polarization plane synchrotron radiation. experimental results co nfirmed analysis.
Abstract Incorporation of water into mantle compositions can have significant effects on the phase relations in systems. In this study, we synthesized an iron‐rich hexagonal hydrous (referred to as “HH1‐phase”) under high pressure‐temperature ( P ‐ T ) conditions deep lower and determined crystal structure HH1‐phase at 79 GPa using multigrain crystallography method. The chemical formula obtained was Fe 12.76 O 18 H x ∼ 4.5) Fe‐O‐H system. To demonstrate role for storage multicomponent...