The phrase "a fixed presence" is correct and usable in written English.
It can be used to describe something or someone that is consistently or permanently located in a particular place or situation.
Example: "The statue in the park serves as a fixed presence, reminding visitors of the town's history."
Alternatives: "a constant presence" or "a permanent fixture".
Prior to the analysis all non-polymorphic loci (fixed presence or absence alleles) were removed as this could bias the analysis (M. Foll pers. comm).. Loci were considered as candidates for being under divergent selection if their log10 Bayes Factor scores were ≥ 0.5 ("Substantial" on Jeffrey's scale of evidence) [ 39].
Even though crime in the subway is lower than it has been in decades, riders still want a fixed human presence in a station in case of danger, she said, especially at night.
This highlights two important points regarding UNICEF cooperation with countries in The Americas and Caribbean Region: firstly the importance of piloting innovations, whether they emerge from individual ideas, local practice or are taken as a learning experience from elsewhere; and secondly, a fixed sub-regional presence by UNICEF is not a prerequisite to do this.
The direct hydrogenation of CO2 to dimethyl ether (DME) has been studied in a fixed bed reactor, in presence of supported CuZnZr/zeolite hybrid catalysts.
These coordinates do not only describe the case of uniform mechanical acceleration in flat spacetime but also an observer trying to keep a fixed position in the presence of a Schwarzschild black hole, as expected due to the principle of equivalence.
The authors aimed to quantify gene expression heterogeneity and establish whether it constitutes noise around a fixed point or the presence of multiple subpopulations that could correspond to functional states.
The presence of a fixed substrate causes the gel swelling to be highly anisotropic, and the actuating motion is perpendicular to the substrate.
Medieval physicians understood that the presence of a fixed dilated pupil indicated optic nerve obstruction, preventing the passage of visual spirit, and that cataract surgery in such cases would not restore sight.
