The phrase "a certain reduction of" is correct and usable in written English.
It can be used when discussing a specific but unspecified decrease in quantity, size, or intensity of something.
Example: "The study indicated a certain reduction of emissions after implementing the new policy."
Alternatives: "a specific decrease in" or "a notable decline in".
Also in brick buildings, they provide a certain reduction of GPR, maximum and mean touch voltages.
The rapidity with which such transfers take place means a certain reduction of the distance factor and of the transaction and communication costs between individuals.
During initial exposure, the OCP dropped about 0.35 V and the interfacial resistance increased several times, indicating a certain reduction of the polymer and oxidation of the steel surface.
Under stress, state-oriented individuals exhibit motivational deficits, energy deficits, impaired attentiveness, and a certain reduction of goal-oriented attentiveness, tending to internalise goals that have not been self-selected and that are not compatible with implicit self-representations (Baumann et al. 2005).
Thus a certain reduction of cardiac output cannot be excluded.
When adsorption on activated carbon powder was used, a certain reduction of mutagenic activity was observed.
The cathodic current might be related to a certain reduction process of γ-Fe2O3.
As outcome measures varied in type (i.e. different types of self-management) or presentation (continuous HbA1c scores and dichotomous measures of proportions achieving a certain reduction), we calculated the standardised mean difference (SMD).
In addition, we provide certain reduction of dimensions results which can be regarded as counterparts of the classical De Giorgi type results.
While link adaptation ensures that transmission errors occur with low probability, low latency retransmissions of erroneous packets within the link layer [6] maintain reliable delivery of packets, at the expense of a certain rate reduction.
The results showed that the high temperature performance of bio-asphalt had a certain degree of reduction before RTFO with the incorporation of bio-oil.
