A5101585130- Seismic Waves and Analysis
- Vacuum and Plasma Arcs
- Pulsed Power Technology Applications
- Electromagnetic Launch and Propulsion Technology
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Geophysics and Sensor Technology
- Plasma Diagnostics and Applications
- Welding Techniques and Residual Stresses
- Electrostatic Discharge in Electronics
- Seismology and Earthquake Studies
- Gyrotron and Vacuum Electronics Research
- Electromagnetic Effects on Materials
- Geological Studies and Exploration
- Advanced Measurement and Detection Methods
- Seismic Imaging and Inversion Techniques
- Electrical Fault Detection and Protection
- Guidance and Control Systems
- Methane Hydrates and Related Phenomena
- Geological and Geophysical Studies
- Underwater Acoustics Research
Washington University in St. Louis
2018-2024
University of Minnesota
2024
Planetary Science Institute
2021
Huazhong University of Science and Technology
2010-2011
Dalian University of Technology
2006-2008
Abstract Many recent Antarctic seismic structure studies use Rayleigh wave data and thus determine only the SV structure. Love waves provide greater resolution for shallow structure, coupled with waves, can constrain radial anisotropy by comparing vertically ( V ) horizontally SH polarized shear velocities. In this study, we jointly analyze phase group velocities from ambient noise to develop a new radially anisotropic velocity model West Central Antarctica an improved crustal using all...
High-power closing switches with graphite electrodes have been used in power-supply system for a large laser pump. The useful lifetime of this kind switch is an interesting and important issue. Previous researchers observed that the erosion loss proportional to amount transfer charge high-power pulsed discharge. Therefore, rate may be predicting estimating electrodes' lifetime. According mathematical model proposed paper, dependent upon several key parameters, including dimensions electrode,...
The reconnection electromagnetic launcher is a type of induction whose propulsive force the interaction between eddy current induced in projectile and pulsed high magnetic field generated by coil. A three-stage system has been fabricated tested. Box-shaped helical coils are constructed to launch flat-plate projectile. Capacitor banks used as power supplies. Triggered vacuum switches (TVS) instead spark gaps closing because advantages such small volume, no maintenance low interference. Owing...
Electrode replacement is an effective method to extend the useful lifetime of spark gap switch with graphite electrodes. In order perform electrode replacement, suppressing temperature rise and preventing static welding/erosion should be considered for electrical contact interface between holder. this paper, a mathematical model proposed based on Holm heat-conduction equations. This can quantitatively prove that some material properties metal holder mechanical characteristics are key...
Abstract Seismic anisotropy provides essential information for characterizing the orientation of deformation and flow in crust mantle. The isotropic structure Antarctic upper mantle has been determined by previous studies, but azimuthal only constrained core phase (SKS) splitting observations. This study determines anisotropic beneath central West Antarctica based on 8—55 s Rayleigh wave velocities from ambient noise cross‐correlation. An velocity map was created using a ray—based tomography...
For study the velocity characteristics of acceleration projectiles, a sketch three-stage reconnection electromagnetic launcher using flat-plate projectiles was introduced in this paper. A theoretical model small-scale 3-stage set up and projectile as well efficiency properties simulated. founded measurement system designed to obtain projectile. control on basis microcontroller computer for launcher. Groups Π-shaped photocouplers were aligned at preset spacing direction flyway order sense...
A compact Marx generator for 500 kA two-electrode spark gap switch has been designed and constructed. The can output a pulse waveform with 30 ns rising time 100 kV peak voltage. Then, series of simulations experiments have proved that the matches totally project requirements high-current gas switch. On other side, when acts, high-frequency high-voltage triggering signal is generated to trigger switch, this will inevitably lead problem electromagnetic interference (EMI) in power conditioning...
<p>The Antarctic continent with its large ice sheets provides a unique environment to investigate the response of solid Earth mass change. A key requirement such studies is high-resolution seismic images crust and upper mantle, which can be used estimate region’s viscous structure. Likewise, these are understanding geologic history underlying geodynamic processes. Although existing transverse isotropic model ANT-20(Lloyd et al., 2020) azimuthally anisotropic...