A5101984044- Welding Techniques and Residual Stresses
- Advanced Welding Techniques Analysis
- Aluminum Alloy Microstructure Properties
- Intermetallics and Advanced Alloy Properties
- Semiconductor materials and interfaces
- Solidification and crystal growth phenomena
- Additive Manufacturing Materials and Processes
- Thermal properties of materials
- Advanced Thermoelectric Materials and Devices
- High-pressure geophysics and materials
- Microstructure and Mechanical Properties of Steels
- Advanced Control Systems Optimization
- High Entropy Alloys Studies
- Metallurgical Processes and Thermodynamics
- nanoparticles nucleation surface interactions
- Silicon Nanostructures and Photoluminescence
- Rare-earth and actinide compounds
- Silicon and Solar Cell Technologies
- Mineralogy and Gemology Studies
- Industrial Technology and Control Systems
- Metal Forming Simulation Techniques
- MXene and MAX Phase Materials
- Hydrogen embrittlement and corrosion behaviors in metals
- Hydraulic Fracturing and Reservoir Analysis
- Phase-change materials and chalcogenides
Central South University
2023-2024
St. Vincent's Hospital
2016
Shangdong Agriculture and Engineering University
2000
Samsung (South Korea)
2000
Iowa State University
1992-1996
Ames National Laboratory
1992-1996
United States Department of Energy
1991-1994
Importance Persisting or new thrombi in the distal arteries and microcirculation have been reported to limit benefits of successful endovascular thrombectomy for patients with acute ischemic stroke. It remains uncertain whether intra-arterial thrombolysis by urokinase following near-complete complete reperfusion improves outcomes among stroke due large vessel occlusion. Objective To assess efficacy adverse events after Design, Setting, Participants This investigator-initiated, randomized,...
In this article, a model predictive control (MPC) method is proposed for constrained linear systems to track bounded references with arbitrary dynamics. Besides inputs be determined, artificial reference introduced as additional decision variable, which serves an intermediate target cope sudden changes of and enlarges domain attraction. Cost function penalizes both state error error, while terminal constraint imposed on reference. We specify the requirements cost guarantee recursive...
Controlled amounts of GaP and P were added to a Si0.8Ge0.2 matrix by powder-metallurgical technique in order evaluate the optimum composition for thermoelectric applications. Bulk determination gallium phosphorus content fully dense, hot pressed compacts was performed inductively coupled plasma atomic emission spectroscopy. The transport properties characterized Hall effect measurements at room temperature electrical resistivity, Seebeck coefficient, thermal diffusivity 1000 °C. Considerable...
The presence of oxygen in silicon-germanium can have a significant effect on the sintering, microstructural, and transport properties these alloys. A neutron activation study was performed to follow total content during preparation mechanically alloyed n-type Si-20 at. % Ge alloys using either fine powders, polycrystalline Czochralski chunk, or single-crystal float zoned starting materials. were prepared with nominal composition Si0.747Ge0.187(GaP)0.016P0.034. concentration measured...
Increased welding speeds are often used to achieve high efficiency. However, defects, including pores and humps, can easily be formed under high-speed conditions. Therefore, a numerical calculation method is proposed analyze the molten pool dynamic behaviors during oscillation laser with aluminum alloy. The experiments on conducted confirm simulated results, both found in good agreement. distribution characteristics of temperature field condition speed discussed. With influence stirring...
The weld morphology of aluminum alloy oscillating laser welding has an important influence on the quality welded joints. To understand formation process morphology, three-dimensional numerical simulation model and energy distribution for circular shaped 6061 are developed in this paper to analyze characteristics effect width. cross section processing surface obtained under conditions different oscillation frequencies. It is found that left width larger than right density side more...
The solidification behavior of a molten pool is critical factor affecting the mechanical properties welded joints. This paper develops multi-scale model combining macroscale heat transfer and fluid flow with microscale phase field for calculating microstructure evolution on two different planes that are perpendicular to thickness direction in laser welding aluminum alloy. To obtain time-varying temperature gradient (G) velocity (R) used simulation, transient conditions proposed. These models...
The morphologies of the keyhole and molten pool during laser welding process are highly related to weld formation process, which affects quality further. To investigate influence oscillation amplitude on morphology evolution processes oscillating stake dissimilar materials T-joints, a three-dimensional multiphase flow numerical model is developed. circular shaped T-joints under different amplitudes calculated analyzed in detail. results show that depth decreases widths at interface increase...
A survey was conducted of several alloy systems identified as having certain properties thought to be desirable in high figure‐of‐merit thermoelectric materials. The examined include the cerium and lanthanum borocarbides, yttrium nitrides, osmium silicides, titanium sulfides. Various approaches preparation these were explored including vapor transport, arc melting, mechanical alloying. Among systems, borocarbides found exhibit p‐type conductivity but generally suffered from relatively...
This paper proposes a novel robust model predictive control (RMPC) method for the stabilization of constrained systems subject to additive disturbance (AD) and multiplicative (MD). Concentric containers are introduced facilitate characterization MD, varying tubes constructed bound reachable states. By restricting states corresponding inputs in with free sizes fixed shape, feasible MDs, which products uncertainty inputs, restricted into polytopes sizes. Then, different centers shapes based on...
The electrical resistivity, thermoelectric power (Seebeck coefficient), Hall effect, and thermal conductivity have been measured in Cux(Dy2S3)1−x compounds with the η-orthorhombic structure composition range 0.006≤x≤0.15 order to determine their potential as high temperature (300–1000 °C) materials. In this Cu-doped Dy2S3 behaves a degenerate semiconductor shows itinerant conduction. resistivity Seebeck coefficient increased increasing reach maximum value of 4.35–7.13 mΩ cm −163 −177 μV/°C,...