"reinforcement by" is a correct phrase and can be used in written English.
It is typically used to indicate a means or method of reinforcing something. Example: The behavior was reinforced by positive reinforcement techniques, leading to a significant improvement in the individual's performance.
Recently, the same philosophy established in the case of steel bars was adapted for reinforcement by innovative materials such as fiber-reinforced polymers (FRPs).
One of the techniques currently used to reinforce road and railway platforms in areas over localized sinkholes is reinforcement by geosynthetic sheet.
It is reinforcement by disparagement, rather than by corroboration.
Homework should represent a challenge or application of classwork, both of which need reinforcement by the teacher.
Mr. Asher added, "The Obama campaign defined Mr. Romney, and that appeal gets reinforcement by the auto bailout".
By themselves, then, granulocytes are of limited effectiveness and require reinforcement by the mechanisms of specific immunity.
They have required reinforcement by special steel pillars that hold in place chain-link fencing to capture any coal as it crumbles off the walls.
Helen was hugely encouraged by her reinforcement by the growing Progs but she was an instinctive loner, not a team player and never became party leader.
I believed, and still do, that empathy is bred in the bone and developed through encouragement and reinforcement by good role models.
As a result, granulocytes are of limited effectiveness by themselves and require reinforcement by the mechanisms of specific immunity (e.g., antibody-mediated immunity).
There are many sociological reasons for the overconfidence of American society, one of which is the overuse of positive reinforcement by generations of parents since the 1960s.
