The phrase "at a small surface" is not correct and does not convey a clear meaning in written English.
It may be intended to describe something related to a limited area or size, but the phrasing is awkward and unclear.
Example: "The paint was applied at a small surface, making it difficult to achieve an even coat."
Alternatives: "on a small area" or "over a limited surface".
It is remarkable that at such a small surface coverage, SFG signals of biomolecules in solution still deliver a significant contribution above the noise ratio.
A 2D axisymmetric numerical model is proposed to analyze the electric field distribution in the electrostatic painting system, assuming a grounded target with a small surface perturbation at the center using COMSOL.
I'm careful to do a small surface area at a time, and not to expose it for too long at first.
One site, located in FU g at position 2585, was embedded into a small surface pocket and therefore was neither defined as buried or exposed (Fig. 5).
At 24°C T cells have a smaller surface area on the supported membrane than at 37°C, are slower to land, and also have decreased lamellipodial motion.
One sample had a surface topography at micron-scale (TCP-B, with a bigger surface structure dimension) whilst the other had a surface topography at submicron scale (TCP-S, with a smaller surface structure dimension).
Techniques for surface structure determination probe a relatively small surface area at a time, ranging from a few micrometers to a couple of millimeters.
At a small scale, the surface is varied and made up of small, sparkly frost deposits at the tips of high spots, surrounded by a low-lying, smooth blanket of dark material.
A turbulent boundary-layer flow over a rough wall generates a dipole sound field as the near-field hydrodynamic disturbances in the turbulent boundary-layer scatter into radiated sound at small surface irregularities.
At a small jet-to-surface spacing, the warm air circulates inside small spaces, jeopardizing heat transfer.
