The real number E is the splitting parameter of the Ewald method and it is usually chosen by balancing the rate of decay of the two series in order to minimize the total number of terms in (10) and (11) [29, 30].
Martin, "On the splitting parameter in the Ewald method," IEEE Microwave Guided Wave Lett., Vol.
This shows research in the design of nonlinear optical materials through various theoretical techniques, such as first-principle approaches and the Ewald method
. Topics include basic theories, colloidal nanocrystals, inhomogeneous metallic films, graded composites, magneti-controlled nonlinear optical materials, electrorheological nanofluids or ferrofluids, and other materials such as organic and polymeric materials and inorganic materials.
Compared to the other acceleration techniques, Ewald method converges fastest (Gaussian convergence) and is the most accurate when the observation point gets close to the sources.
However, the Ewald method successfully combines both formulations into fast converging series.