The phrase "a different topic in" is correct and usable in written English.
It can be used when introducing a new subject or theme within a discussion or text.
Example: "While we were discussing climate change, I would like to shift to a different topic in renewable energy."
Alternatives: "another subject in" or "a separate issue in".
Each session covers a different topic in quantitative techniques, provides an application to medicine, and includes a modeling activity using MATLAB.
Each Lunch-and-Learn covers a different topic in the realm of polymers, with the aim of connecting researchers in relevant fields as well as those who are new to the subject.
The new homepage features around two dozen widgets, each of which will focus on a different topic in music news.
We randomized the order of the three scenarios across subjects such that each subject delivered a speech on a different topic in each of her three exposure conditions.
The other column, on a different topic, appears in the printed paper.
Each term focuses on a different topic, resulting in a repeating cycle that covers medical ethics, responsible conduct of research, written and oral technical communication, and translational issues.
Of the seventeen respondents who would consider converting their review to Cochrane format, only four had a review of either the same or a different topic published in the CDSR.
Each year, a different topic was tackled in depth and detail.
I presented a toy experiment I'd designed, on a different topic from lecture, in which I hid the assumption of a mechanism, and interpreted the ambiguous results of the experiment to support this mechanism.
It's amazing how they're able to rapidly switch gears from one topic to a totally different topic in just a few seconds.
An application in a different topic has also been tested in the scope of urban mobility management at a local level4.
