The phrase "at which certain" is correct and usable in written English.
It can be used in contexts where you are referring to specific instances or conditions related to a particular subject or event.
Example: "There are specific criteria at which certain applicants may qualify for the scholarship."
Alternatives: "in which specific" or "under which particular".
Curie point, also called Curie Temperature, temperature at which certain magnetic materials undergo a sharp change in their magnetic properties.
Figure 5 also indicates the temperatures at which certain glasses reach standard viscosity reference points that are important in glassmaking.
In lossless cylinders, for each chosen set, there are difficulties at those frequencies at which certain functions become zero.
Similarly, elaborate safety measures are required for disposal of radioactive wastes from nuclear reactors, due in part to the slow rate at which certain fission products decay.
The indices considered are formed by shifting a reference curve until the highest position is found at which certain specifications, or rules, are met.
By tracking the frequency at which certain starspots reappeared, Sanchis-Ojeda determined that the star completes a full rotation every 12.5 days — considerably longer than the planet's orbital period of 8.5 hours.
Similar critiques of superstition attacked the action at a distance which certain superstitious practices seemed to rely on (Cameron 2010, Ch. 7).
(CFM airflow is the rate at which a certain volume of air moves in a certain period of time. CFM stands for cubic feet per minute).
Sometimes it includes animation and graphics that show the angle at which a certain instrument should be held, for example.
The proposed approach, therefore, aims at providing settings to model control parameters at which a certain model outcome is best in performance and is less sensitive to variations in model random (noise) factors.
Using automated pressure sensors and a proprietary algorithm developed by the Wyss team, data acquired from the device is analyzed in real-time, precisely predicting the time at which a certain blood sample will obstruct the blood vessel network.
