A5009201551- Muon and positron interactions and applications
- Semiconductor materials and devices
- Copper Interconnects and Reliability
- Winter Sports Injuries and Performance
- Metal-Organic Frameworks: Synthesis and Applications
- Higher Education and Teaching Methods
- Sports Dynamics and Biomechanics
- Sport and Mega-Event Impacts
- Advanced Memory and Neural Computing
- Magnetism in coordination complexes
- Crystallization and Solubility Studies
- Material Dynamics and Properties
- Crystallography and molecular interactions
- Ferroelectric and Piezoelectric Materials
- Graphene research and applications
- X-ray Diffraction in Crystallography
- Chemical Synthesis and Characterization
- Ferroelectric and Negative Capacitance Devices
- Power Systems and Technologies
- Safety and Risk Management
- Organic and Molecular Conductors Research
- Industrial Technology and Control Systems
- Collaboration in agile enterprises
- Machine Fault Diagnosis Techniques
- Glass properties and applications
Xi'an Jiaotong University
2020-2024
North Carolina State University
2013-2023
Wuhan University of Science and Technology
2010-2022
Wuhan University
2022
Wuhan Asia Heart Hospital
2022
First Affiliated Hospital of Guangzhou Medical University
2021
State Key Laboratory of Respiratory Disease
2021
Guangzhou Medical University
2021
Guizhou University
2020
Harbin Institute of Technology
2020
Polymer properties, such as their mechanical strength, barrier and dielectric response, can be dramatically improved by the addition of nanoparticles. This improvement is thought to because surface area per unit mass particles increases with decreasing particle size, R, 1/R. favorable effect has reconciled expectation that at small enough R nanoparticles must behave akin a solvent cause deterioration properties. How does this transition in behavior from large solutes limit occur? We...
There are several compounds for which there exists a disconnect between porosity as predicted by crystallography and measured gas sorption analysis. In this paper, the Zn-based analogue of Cu(3)(btc)(2) (HKUST-1), Zn(3)(btc)(2) (Zn-HKUST-1; btc = 1,3,5-benzenetricarboxylate) is investigated. Conventional analysis Zn-HKUST-1 powder X-ray diffraction indicates retention crystalline structure but negligible nitrogen uptake at 77 K. By using positron annihilation lifetime spectroscopy, densified...
A single small-ligand–based ultra-microporous MOF showing high CO 2 selectivity and PSA working capacity for H purification.
We show that thin film star-shaped macromolecules exhibit significant differences in their average vitrification behavior, both magnitude and thickness dependence, from linear analogs. This behavior is dictated by a combination of functionality arm length. Additionally, the glass transition temperature at free surface molecule may be higher than interior, contrast to analogs where opposite true. These findings have implications for other properties, due largely origins, entropic, this behavior.
Wireless power transfer (WPT) has drawn more and attention many applications, such as wireless electric vehicle charging systems, which require high power, efficiency, factor. In this paper, a single-stage WPT resonant converter with bridgeless boost power-factor-correction (PFC) rectifier is proposed to improve efficiency quality of line input, reduce production cost complexity for high-power system. The topology creatively apply in system, much advantageous than conventional two-stage...
A new method to probe nanoscale structure (pores, defects, and damage accumulation) for microporous coordination polymers during adsorption of guest molecules (see figure, representing CO2 sorption with definitive evidence residual porosity) or undergoing thermal degradation is demonstrated using positron annihilation. Structural features invisible traditional X-ray diffraction gas-adsorption techniques are revealed, demonstrating a capability porous materials characterization.
The addition of a carbosilane skeleton precursor to plasma-enhanced chemical vapor deposition process producing porous SiCOH dielectrics (pSiCOH) is shown affect the carbon content and pore structure pSiCOH. Positron annihilation lifetime spectroscopy (PALS) reveals that added reduces connectivity. PALS also shows evidence both smaller ultramicropores larger supermicropores in these materials. method adsorption porosimetry alpha-plot analysis provide an understanding connectivity results...
Positronium (Ps) is shown to exist in a delocalized state self-assembled metalorganic crystals that have large 1.3--1.5 nm cell sizes. Belonging class of materials with record high accessible specific surface areas, these highly porous are the first allow direct probing simple annihilation lifetime techniques transport properties long-lived triplet Ps what hypothesized be Bloch state. Delocalized has unprecedented (high) mobility driven primarily by weak phonon scattering unusual and...
Depth-profiled Doppler broadening spectroscopy of positron annihilation on the cyclic fatigue-induced fracture surfaces three amorphous Zr44Ti11Ni10Cu10Be25 metallic glass specimens reveals presence a 30–50nm layer increased free volume that is generated by propagating fatigue crack tip. The and character this transformation zone independent initial amount bulk volume, which was varied structural relaxation via annealing, voids in intense deformation are distinct from those typical bulk.
Depth-profiled Doppler broadening spectroscopy of positron annihilation on fatigue fracture surfaces two amorphous Zr44Ti11Ni10Cu10Be25 metallic glass specimens reveals the presence a layer increased free volume induced by cyclic deformation, as compared to that have been etched remove any surface damage. The damage layer, or transformation zone (FTZ), is generated propagating crack tip and deduced size similar predicted plastic at number locations where grew different stress intensities....
The aim of this work is to clarify the scintillation-yield enhancement in $\mathrm{Lu}\mathrm{YAG}:\mathrm{Pr}$ scintillators obtained by $\mathrm{Li}$ codoping via integrated study valence state activators, preferential site occupancy codopants, and defect structures from experimental theoretical insights. With codoping, light yield energy resolution $10\ifmmode\times\else\texttimes\fi{}10\ifmmode\times\else\texttimes\fi{}10\phantom{\rule{0.1em}{0ex}}{\mathrm{mm}}^{3}$ samples are improved...
Concentrated solar power (CSP) is a promising option to generate flexible and green for the grid. Power block important enhance energy efficiency flexibility of CSP plants, which mostly operate in off‐design conditions dynamic processes due intermittency energy. Many studies have been conducted on performance analyses they are reviewed herein. Steady‐state models summarized, influences entire system discussed. Through improving dual‐pressure‐level steam generator declining back‐pressure...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Ming Liu, Jeremy Moxom, Ayman I. Hawari, David W. Gidley; The intense slow positron beam facility at the PULSTAR reactor applications in nano-materials study. AIP Conf. Proc. 19 April 2013; 1525 (1): 455–459. https://doi.org/10.1063/1.4802370 Download citation file: Ris (Zotero) Reference Manager EasyBib...
Adjusting the functional group of a porogen is found to have tremendous effect on pore structre porous low dielectric constant films with silsesquioxane as matrix precursor. The size and interconnection length measured by positronium annihilation lifetime spectroscopy can be used deduce shape its evolution porosity from templates isolated molecules through film percolation. Inert, self-linkable, amphiphilic porogens are demonstrated randomly aggregate three-dimensionally, linearly...