On the other hand, employing of a mixture of solvents in the casting solution can remove large pore formation during instantaneous phase separation and can convert finger like to sponge like pores .
This results in an increment in the exchange rate between solvent in the polymer film and nonsolvent in the coagulation bath (instantaneous phase demixing), which is normally accompanied with a porous membrane structure, higher gas permeability and lower gas selectivity [20, 25-28], Then, instantaneous phase demixing between solvent and nonsolvent has occurred using EtOH-50% as external nonsolvent.
Hence, lower time is required to eliminate solvent from polymer and then instantaneous phase demixing has occurred between solvent and nonsolvent by immersing the wet film in the coagulation bath.
Acoustic impedance, dominant frequency, amplitude weighted phase and instantaneous phase attributes are used as optimal attributes for the estimation of hydraulic flow units.
According to Table 2, the first 4 attributes composed of acoustic impedance, dominant frequency, amplitude weighted phase and instantaneous phase are considered to be the optimal input sets for predicting HFUs.
4 attributes, including acoustic impedance, dominant frequency, amplitude weighted phase and instantaneous phase, are considered to be the optimal inputs for predicting HFUs.
Instead of creating phase delays as light propagates through the thickness of the material, you can create an instantaneous phase
shift right at the surface of the lens.
The impact phase is an instantaneous phase
changing velocities of the system suddenly, but leaving the positions unchanged.