The phrase "a certain instance in time" is correct and usable in written English.
It can be used to refer to a specific moment or occurrence that is being discussed or analyzed.
Example: "In a certain instance in time, the decision made by the committee changed the course of the project."
Alternatives: "a specific moment in time" or "a particular point in time."
"In these certain instances in time we need to be more controlled.
"We acknowledge that in certain instances in the 2004 to 2012 period of time the company did not do as much as it should have with respect to agent oversight," said Western Union spokesperson Bill Chandler.
In both cases, the system is sampled periodically but the control actions are only computed at certain instances of time (based on events), which are a subset of the sampling times.
In certain instances at both time periods, the unprocessed grafts were moderately more active compared to the photooxidized grafts.
The power consumption P t) at a certain time instance t is then determined as follows (in Watt): P ( t ) = V · I ( t ) (6). with V the voltage (in Volt) and I t) the current at time t (in Ampere).
The only reason to hold individual speech and information rights would be to better the society, a condition which would likely be met only in certain instances rather than across time, making the default a lack of freedom.
Also, the so-called shock models are appropriate if deterioration is caused due to external shocks occurring at certain instants in time (see, for instance, [4]).
For instance, such strategies may require a certain amount of time to influence how journalists value and use research in their work.
The meaning of belonging to a certain group at a certain point of time can change dramatically, however, for instance, attending school which is classified as "low education" used to be the norm in many countries for long periods of time, whereas nowadays pupils with basic schooling are rather from a selected population.
In certain instances, like New York Times Executive Editor Bill Keller (No. 51), we judged the resources at his disposal compared with others in the industry.
