The phrase "a topic of active" is not complete and requires additional context to be fully correct and usable in written English.
You can use it when discussing subjects that are currently being researched or debated, typically followed by a noun that specifies the topic.
Example: "Climate change is a topic of active research among scientists worldwide."
Alternatives: "a subject of ongoing" or "an area of active".
Their treatment in proof-net-like proof systems is currently a topic of active research.
Therefore, the development of baseflow estimation methods is a topic of active research.
Hemodialysis patients with erythropoiesis-stimulating agent (ESA) hyporesponsiveness have been a topic of active research.
As a result, objective test methods have been developed in recent years and remain a topic of active research.
The convergence of discretization methods for OCP is a topic of active research [4, 13, 16, 16, 17, 20, 21, 22].
A theoretical description of the slow relaxation in complex condensed systems is still a topic of active research despite the great effort made in recent years.
Development of the cost-effective single-pass evacuated tubular collector (SPETC) for the solar processes heat is a particular topic of active research.
But discussion of the Agent Orange legacy has matured in recent years from a topic of polarized views toward active bilateral cooperation; from poor understanding to clarity and specificity; from guilt to a shared sense of responsibility for a humanitarian response.
Along the line of past publications of the authors on the topic of active vibration control of flexible structures, the present paper proposes an improvement of the robust control strategy leading to strongly stabilizing bandpass controllers.
The evolutionary reasons for this loss of urate conversion to allantoin remain the topic of active speculation.
One topic of active debate over the past decade was the definition of 'efficacy' as it relates to HBOCs.
