Id suggest that you look up the respective journal webpages. All that I have submitted to have a link for prospective authors to submit work for consideration.Good Luck.
It depends on your area of research. The journal you choose should cover your dissertation content. The paper you are writing to send to a journal should be a shortened version of you dissertation.
There are some powerful journal finder, and recommending automatic tools that can help you finding the most suitable journals (per publisher) for your article/topic.