The phrase "a pair of phases" is correct and usable in written English.
It can be used when referring to two distinct stages or periods in a process or phenomenon.
Example: "The project will be completed in a pair of phases: the initial research phase followed by the implementation phase."
Alternatives: "two stages" or "a duo of phases".
The α and β phases of isotactic polypropylene form a pair of crystal phases which are characterized by the fact that the less stable β phase has a faster growth rate than the more stable α phase in a large central part of the crystallization range.
This phase plate consists of a pair of complementary phase plates with Talbot phase coding structure.
In order to confirm its advantages, the performances of the proposed method were compared to a conventional crossover network bank design [4] using a pair of in-phase squared Butterworth filters.
For the event shown in Fig. 5(a), a pair of weak initial phases (oceanic Pn/Sn) and later phases (P/S) was observed at stations along the eastern coast of the Kii Peninsula.
Potential based molecular dynamics simulations were performed for Al Al2Cu phase boundaries (PBs) at a temperature of 50 K using a newly designed computation geometry that enables modeling hetero-interface configurations for an arbitrary pair of phases.
Quantum control of electron spins in the two-dimensional electron gas of a CdTe quantum well with a pair of Raman-resonant phase-locked laser pulses.
In this paper, the authors proposed the use of a pair of an in-phase squared Butterworth crossover filters.
A pair of weak oceanic Pn/Sn phases and later P/S phases should be observed at stations if the earthquakes occur within the oceanic crust of low seismic velocities (e.g., Fukao et al., 1983; Hori et al., 1985).
Since the plane B and the output plane C form a pair of Fourier conjugates, the phase space on the plane C is a 90° rotation of the phase space on the plane B. The ripples in Fig. 8g (i) produce oscillations in the transverse intensity at the edges of the beam (Fig. 8h).
As an alternative to considering a three-dimensional phase space, however, it is convenient to switch between a pair of two-dimensional slow phase planes, corresponding to the back two faces in the top left of Fig. 8, as EP and ER alternate between periods of silence and activity.
