The phrase "a matter of study" is correct and usable in written English.
It can be used when discussing a topic or subject that is being examined or researched.
Example: "The effects of climate change on biodiversity are a matter of study for many scientists."
Alternatives: "a subject of research" or "a topic of investigation".
The consequent rapid boiling is a matter of study for the nuclear power plants safety evaluation, because of the risk for rod-clad failure.
The estimation of the time to corrosion initiation in aggressive environment is still a matter of study in life time assessment of RC structures.
However, there is no universally agreed-upon description of such semantics, and mental states are defined in different ways, usually ad hoc, even when they are shared as a matter of study in different disciplines.
The knowledge of strain and slip distributions along the embedded element, is the only way to get information on the interface constitutive relation and it has been a matter of study for several research workers.
This option would take advantage of the available information about obtaining humic substances by purely chemical methods, a matter of study in soil science for many years (e.g., among many, Arfaioli et al. 2003; Cataldo 1998; Datta et al. 2001; Mathur and Schnitzer 1978; Wang and Huang 2000).
The mechanism of action triggered by quercetin in CLL is still a matter of study.
Yet it is nonetheless the case that historical and intercultural engagement was, until and throughout this period, largely a matter of studying religious and cultural artefacts from temporally or geographically distant eras.
Watching the surprisingly short and off-the-stage unassuming Rylance is a matter of studying someone who regards acting simultaneously as profoundly serious and unrestrainedly amusing.
In the past few years, developing various metallic or dielectric nanostructures with appreciable magnetic response at optical frequencies has been a matter of intense study in the field of metamaterials.
Carter, S. J. et al. A matter of time: study of circadian clocks and their role in inflammation.
Whereas false positive results associated with RNAi reagents has been a matter of extensive study, the issue of false negatives has received less attention.
