The phrase "an optimal ratio" is correct and usable in written English.
It can be used when discussing the best or most effective proportion of two or more elements in a particular context, such as in cooking, finance, or scientific experiments.
Example: "To achieve the best flavor in the dish, it's important to maintain an optimal ratio of spices to ingredients."
Alternatives: "an ideal proportion" or "a perfect balance".
An efficient dosage method can be applied to obtain an optimal ratio of recycled concretes made with biomass additions.
The data supported an optimal ratio between the hydrophilicity of the PEG polymer and the number of hydrophobic anchors.
Thus, without the ability of a de novo alanine production, an optimal ratio of ATP to reductant is provided by pure glutamate uptake.
There is an optimal ratio in the composition of the precursors for which the best performance is achieved.
According to an actual commodity price on the market, one can chose an optimal ratio between sugar and ethanol production.
There is beef Stroganoff with mushroom-cream sauce on the menu, as well as burgers of the straightforward American drive-through variety, made with fairly thin but impressively juicy, bright-tasting patties, griddled until their exteriors are crispy and sandwiched in squishy potato buns with an optimal ratio of shredded iceberg lettuce, onion, pickles, and American cheese.
It is also demonstrated that there exists a unique optimal ratio in three UA's, and no direct heat exchanger between hot streams is recommended.
A more optimal ratio, they suggest, would be 52percentt of training time spent learning on the job, 27percentt from other people and 21percentt in formal education.
Furthermore, there should be a certain optimal ratio between the grid field width and the spacing between grid points.
The country has a ratio of 1 doctor per 25 000 people and 1 nurse per 10 000 people [ 32], a figure below optimal ratio recommended by the WHO of 23 nurses or doctors per 10 000 people [ 33].
In Figure 10, a plot showing the optimal ratio σ/µm, relative to each focus level offset can be seen for a sample cell.
