The phrase "an effective approximation for" is correct and usable in written English.
It can be used when discussing a method or model that provides a close estimate or representation of a value or concept.
Example: "The formula serves as an effective approximation for calculating the area of irregular shapes."
Alternatives: "a useful estimate for" or "a reliable representation of".
Spherical symmetry is an effective approximation for most planet-scale gravitational calculations.
To achieve both, a practical formula is proposed for computing a reference length for a given computational grid, such that (2π)−1 gives an optimal value for rectangular domains and also serves as an effective approximation for general domains.
In fact, Theorem 1 obtains an effective approximation for the error term of the Mathieu series.
Although Eq. (10) is derived for a weightless tubular string, it is proved to be an effective approximation for a tubular string with weight (Gao et al. 1996).
Meanwhile the simulated annealing algorithm is an effective approximation algorithm for solving these kinds of large-scale combinatorial optimization problems with the advantage of avoiding falling into the local optimization.
Similarly, we develop a physics-based thermal compact model for packaged ICs using an effective media approximation for the Back End Of Line (BEOL) interconnects and ICs packaging.
By exploiting a multilevel control structure, we show that truncated hierarchical B-spline (THB-spline) representations support interactive modeling tools, while simultaneously providing effective approximation schemes for the manipulation of complex data sets and the solution of partial differential equations via isogeometric analysis.
We calculated these factors for oblate spheroid nanoparticles in the quasistatic limit by using an effective medium approximation accounting for the influence of both air and GaAs.
The response surface method (RSM), a simple and effective approximation technique, is widely used for reliability analysis in civil engineering.
In this study, we instead use a simple effective medium approximation for the complex dielectric function of the medium surrounding the metal nanoparticles: {varepsilon}_{mathrm{medium}}left(lambda right)=frac{2{varepsilon}_{mathrm{air}}left(lambda right)+{varepsilon}_{mathrm{GaAs}}left(lambda right)}{3}.
