The phrase "at certain rates" is correct and usable in written English.
It can be used when discussing varying prices, speeds, or conditions that apply under specific circumstances.
Example: "The service is available at certain rates depending on the level of usage."
Alternatives: "at specific prices" or "at varying rates".
That is, in computer calculations the cells fire signals at certain rates, connect in conventional ways, squirt out familiar chemicals and behave just like real brain cells do.
No, it says if you want to make as much money as you did last year, then you have to see patients at certain rates, so that you can meet quotas for reimbursement.' And that's a little different.
In digital/sampled-data motion control systems, the system outputs are only available at certain rates.
These laboratory-based measurements may be used as guides for the power levels needed to core solid water and CO2 ices at certain rates.
This work investigates the strength and durability of alkali activated blast furnace slag mortars (AAS) with very finely ground pumice (P) at certain rates.
In the lab, they used radiocarbon dating to estimate "death dates" for the plants, measuring the amounts of naturally occurring isotopes that decayed at certain rates over time.
Processes of anodic passivation and corrosion behaviour of titanium and binary titanium alloys in non-oxidising acids at elevated temperatures have been investigated, when the alloy dissolution in the passive state proceeds at certain rate.
The basic approach to doing this is to consider the kiln as a furnace system composed of a control volume with well-defined spatial boundaries into which mass and energy enter at a certain rate and leave at another rate.
During 'reactivation', virions are released from neuronal endings at the dermal epidermal junction at a certain rate.
Another way to build the continuous model is to try to mimic biological reality more closely: mRNAs, proteins, etc. are produced at a certain rate and are at the same time degraded.
Sometimes your economy develops at a certain rate and your population develops at a certain rate but not every single thing around it grows at the same rate.
