Peer-reviewed research article vs. dissertation
You're writing your dissertation and want to publish your first research article. What is the difference between your dissertation and a publishable article? Working at a peer-reviewed journal, I have seen manuscripts of all types including those that look like they were copied and pasted from a dissertation. Research articles are concise summaries of your work directed at readers who are experienced in your area of research. Dissertations serve as a platform for an evaluation of your expertise and work. If you keep this in mind, then you will have a much better chance of having your work published.