The latter technique requires no immediate approximations, is applicable to any reasonable diffusivity field and is therefore the preferred approach.
As it was mentioned above, the adiabatic approximation is applicable for calculation of lower levels of the energy spectrum.
These authors hence showed that a 2D plain strain approximation is applicable to shearing with parallel tools.
By introducing a modified von Neumann solution, this error approximation is applicable to problems with variable coefficients.
For the values of x less than 0.01, the below approximation is applicable: E_{i} left[ { - x} right] = ln left( {1.781x} right) (20).
As a result, in the case of sinusoidal source with a small amplitude of oscillations, the constant source approximation is applicable at the start-up process [21, 22].
As aforementioned, the quasi-static approximation is applicable in calculating the optical extinction cross section of a single TiN nano-disk.
The asymptotic, physical optics (PO) approximation is applicable to electromagnetic scattering analysis of electrically large, conducting objects, which is important for various applications, such as radar cross-section (RCS) calculations.
The model with only viscous transport in bed and the linear driving force approximation for the uptake rate is the recommended option for modeling PSA operations, provided that the LDF approximation is applicable, since it is easier to handle numerically and reduces to the equilibrium model in the limiting case of large adsorption rate constants.
Two extreme cases of the TSV geometry are addressed: disc-vias (with height-to-diameter ratios below 0.25), when plane stress approximation can be used, and rod-vias (with height-to-diameter ratios above 2.5), when plane strain approximation is applicable.
