Fig. 1. Four typical modes of streamer discharges in nonpolar liquids^[4]

Fig. 2. Bubble radius as a function of time since bubble formation in streamer discharge^[29]

Fig. 3. Optical images and propagation models of positive and negative streamers branching in transformer oil^[39-40]

Fig. 4. 3D simulation of streamer branching in transformer oil^[44]

Fig. 5. Streamer branching process in transformer oil due to impurity (2D)^[45]

Fig. 6. Correlation between discharge modes and water conductivity under different voltages^[60]

Fig. 7. Image of streamer discharge in transformer oil under different pressure^[65]

Fig. 8. Propagation of positive streamer in water (σ＝90 μS/cm)^[60]

Fig. 9. Simulations of streamer development in transformer oil under pulsed voltages^[83]

Fig. 10. Schematic of electrostriction-induced liquid ionization^[91]