ME! For "The Hot Equations: Thermodynamics & Military SF" which appears in Riding The Red Horse.
We've got the essay linked to the shop up above. You can also get ebooks of all of the works on the Hugo Ballot by buying a Supporting Membership for Sasquan for $40. The eBooks will include all of Riding The Red Horse, which includes Hot Equations. A Supporting Membership also allows you to vote for the Hugos. You are welcome to purchase the work in either place, but the best value to be had is the Supporting Membership.
I am honored to be a Hugo Awards Finalist for that piece. I am currently trying to see if I can make it to Sasquan on a sensible budget.