The phrase "are first identified" is correct and usable in written English.
It can be used when discussing the initial recognition or discovery of something, often in a scientific or analytical context.
Example: "The species are first identified in the tropical rainforest, where their unique characteristics are observed."
Alternatives: "are initially recognized" or "are first discovered."
These patterns are first identified, and then quantified to establish proppant transport equations.
Using the equation model, resonance frequencies and their strengths are first identified.
In this chapter, some of the literature gaps with respect to the coordination of multiple microgrids are first identified.
Electrons of both charge signs are first identified by the conventional dE/dx versus residual energy technique.
Within the proposed approach, statistically significant microstructure parameters are first identified based on their linear impacts on material constitutive properties.
Various modal frequencies of girder and those of the local pier are first identified for Kao-Ping-Hsi Bridge.
The thermal-hydraulic couplings of such a system are first identified on a reference thermal-hydraulic calculation.
Possible solar and geomagnetic activity effects are first identified and then anomalies are calculated for all characteristics using reference values (15-day running medians ± interquartile range).
For a specified multicomponent separation problem, subsets of feasible separation techniques are first identified for every binary and user-specified separation tasks.
Candidate reactants are first identified by interatomic separation, followed by the application of a generalized topology matching algorithm to confirm they match the pre-reaction template.
The stabilizing regions in integral-derivative plane of the controller are first identified using a graphical stability criterion applicable to fractional-delay systems.
