The phrase "are very small during" is correct and usable in written English.
It can be used to describe the size of something in a specific time frame or context.
Example: "The particles in the solution are very small during the initial reaction phase."
Alternatives: "are quite tiny during" or "are significantly reduced during".
In addition, it is observed that the DEA and BHEP concentrations were very small during the experimental run, which suggests that it may be a key intermediate compound.
This is likely the case in China as listed firms mainly borrow from banks and the corporate debt market was very small during our sample period.
Moreover, contributions due to the Pedersen currents are in the opposite direction to those of the FACs during the daytime (Shinbori et al. 2009), and hence the net contribution from these two current systems would be very small during the daytime.
When we compute the displacement for a dislocation source shown by the solid circle in Fig. 1, the vertical displacement at Oshika is also consistent with the observed data (Fig. 5); it is very small during the initial 10 s after the arrival of the P-wave.
Since the ad hoc broadcast network we consider here for safety application adopts short message, high date rate, and one-hop direct message sending, the link breaking probability due to mobility of vehicles is very small during a packet transmission period.
As for (1), because the number of deaths in the USA and Canada was very small during the early stage, the spike may reflect (unpredictable) probabilistic variations in the number of deaths among a small number of confirmed cases.
The amount of crystals was very small during the initial stage of development and they would usually be on their own; nevertheless, during the intermediate stage, small groups of about five or six crystals, and sometimes even more, were seen.
Moreover, imine peroxide (OONH) was first detected by Laursen et al. and they have shown that the activation energy of OONH is very small during the reaction of O2 with NH.
Figures 4, 5, and 7 show that the DTEC (DTEC = IRI TEC GPS-TEC) values are very small (within ±5 TECU) during each season from 2009 to 2013 except during the winter season of 2012 (DTEC approximately 9 TECU) and 2013 (DTEC approximately 7 TECU).
Additionally, anthers of most species are very small (<0.05 mm in length) during cell type specification, and the patterning events required to build the layered somatic tissues occur in rapid succession.
