The phrase "period focus" is correct and can be used in written English.
It refers to the specific time frame or period that is the main focus or subject of a sentence or paragraph. Example: The documentary's period focus is the 1960s, exploring the social and political changes that occurred during that time.
Current research examining health behaviours during the preconception period focus on smoking [ 20], alcohol use [ 21], diet [ 19] and exposure to communicable disease [ 22].
Papers from the earlier period focus on recognizing institutionalization as patients' response to institutional care and the impact institutional care has on patients' self-concept, while the later papers give emphasis to policy and legal frameworks regulating care and clinical responsibility and paternalism in clinician-patient relationships.
During this period focus on the little things that make you happy.
The second half of the class period focused on the calculation and comparison of flooding areas based on water levels.
His writings in this period focused almost exclusively on matters of global security, and Ignatieff was tapped in 2001 to head the Carr Center for Human Rights Policy at Harvard.
It is thought that hunting in this period focused on small prey, such as rabbits and lizards, that could be caught in nets or snares.
His research in that period focused on Beethoven's use of humor, Wagner's Ring Cycle, and American Studies of the early-to-mid 19th century, while serving as an instructor at Utica College, Cayuga County Community College and Syracuse University.
Works of this period focused on the role of elites, political parties, and interest groups, on legislative and bureaucratic processes, and especially on how voters in democracies make their electoral choices.
Many of the arms-control agreements of the Cold War period focused on mutual deterrence, a strategy in which the threat of reprisal would effectively preclude an initial attack.
"Fundamental period" focuses on the fundamental period of the structure.
A majority of Bank-funded operations in this period focused on public transport modes.
