Ice formation in the Arctic during summer: false-bottoms
  The only source of ice formation in the Arctic during summer is a layer of ice called false-bottoms between an under-ice melt pond and the underlying ocean. Of interest is to give a mathematical model in order to determine the simultaneous growth and ablation of false-bottoms, which is governed by both of heat fluxes and salt fluxes. In one dimension, this problem may be considered mathematically as a two-phase Stefan problem with two free boundaries. Our main result is to prove the existence and uniqueness of the solution from the initial condition. 
Phan Thanh Nam (UNS-HCMC), Alain Pham Ngoc Dinh (MAPMO), Pham Hoang   Quan (UNS-HCMC), Dang Duc Trong (UNS-HCMC)