The phrase "a given portion" is correct and usable in written English.
It can be used when referring to a specific part or segment of something that has been predetermined or specified.
Example: "In the experiment, we will analyze a given portion of the sample to determine its chemical composition."
Alternatives: "a specified segment" or "a designated part".
Over time, he and his successors significantly increased the "food-conversion ratio" — the amount of feed required to produce a given portion of edible body mass.
When enforcement takes place on such a scale, agencies set rules-of-the-road for a given portion of the financial sector.
Wave heights in a given portion of a lake may vary considerably, due to interactions that suppress some waves and amplify others.
The package also contains a structural search algorithm designed for the retrieval of the global R-factor minimum between calculated and measured intensity spectra within a given portion of the parameter space using Tensor LEED.
This identification does not imply that a given portion of the tree is an exact copy of the earlier work but that the portion was based on the earlier work and is intended to perform a similar function.
In this case, we consider that all users get a given portion of the power available at the BS, i.e., (p_{i} tau) triangleq frac {bar {P}^{i}_{text {BS}}(C_{i} tau)) - P^{(i)}_{V} tau)}{K_{i}}), (forall i in mathcal {B}), where K i is the fixed maximum number of users that the BS i wants to accept.
In a variation of the "exquisite corpse" method in which a partner is only given portions of an otherwise concealed drawing to work on, Dzama and Pettibon developed each other's compositions through illustrations, collage, and writing.
If eating a large portion (a given, surely?), a little green salad on the side is no bad thing.
Broadly speaking, in English we can use 'part' to indicate any portion of a given entity.
Unfortunately, biopsies sample only a small portion of a given tissue.
It is about preventing the marginalization of large portions of a given territory and their population.
