"this demarcation" is correct and usable in written English.
It is typically used when referring to a specific boundary or limit. Example: This demarcation between the two properties was marked by a row of trees.
The Treaty of Ghent (1814) confirmed this demarcation, although the location of the Maine New Brunswick boundary remained in dispute until the Webster-Ashburton Treaty of 1842.
But because this demarcation involves a boundary — the waterline — that always moves, there is continual skirmishing along the border between public and private.
This demarcation has been clearly shown on a strain rate by temperature plot.
This demarcation line has been additionally strengthened by the subsequent influence of Western philosophy from the 19th century onwards.
In futures research that is politically engaged, this demarcation is not always made with the necessary scrupulousness.
This demarcation could be done in various ways, and most capability scholars think that different answers are appropriate in different normative exercises.
But all of a sudden, this line of demarcation between what they could take and what they couldn't take became very blurry because Major League Baseball did not define it.
This line of demarcation between long-term bull and bear markets often serves as staunch support for ailing markets before giving way to bear market selling.
"It is a very dangerous city, because you have this occupation force of the police, but you don't have any co-operation between the police and the citizenry, because of this line of demarcation," Baltimore attorney A. Dwight Pettit says in the report.
This is the demarcation to which I try my very best to adhere in my daily work as an academic.
On this view, the demarcation criterion should not be applied to an isolated hypothesis or theory but rather to a whole research program that is characterized by a series of theories successively replacing each other.
