The phrase "a certain interaction" is correct and usable in written English.
It can be used when referring to a specific but unspecified interaction that is relevant to the context.
Example: "The study focused on a certain interaction between the two variables that had not been previously explored."
Alternatives: "a specific interaction" or "a particular interaction".
In a second control-loop, a stiffness controller continuously adjusts the pressure of the pneumatic chambers to realise a certain interaction stiffness.
While this type of slit basically shows the summative performance of each composing slit, a certain interaction among slits occurs if the resonant frequency of each slit comes close to each other.
Wide-angle X-ray diffraction studies of the cast films of blends having more than 50 wt% cellulosic content showed them to be highly amorphous, indicating the presence of a certain interaction between the cellulosics and PAN.
"There's a certain interaction style among astronomers.
Understanding the context in which there is a certain interaction is essential for individuals to respond appropriately to the situation.
After finding the epitomes for each positive example of a certain interaction class, we use the prime sequences to train body part detectors ( {boldsymbol{w}}_i^j ).
The results indicated that there was an certain interaction existed between P 2,3-DMA) and nano-SiO2 P 2,3-DMA, the thermandstability and electrochemical performances of PSC was much better than that of particles).
Privacy is greatly reduced and as a result certain interactions are frequent and may be for prolonged periods.
It has a certain visual interaction with the space, which I've never done before".
The genotype may predispose a subject to certain interactions that vary from activation to inhibition depending on the individual's KIR/HLA profile [ 9].
One has to bear in mind that the neural activity pattern found in our study reflects to a certain degree interactions of subjective preference and the experimental task.
