Paper Award Subcommittee of Kagaku Kogaku Ronbunshu has assessed the 105 papers published in volume 35 into 2009, and the editorial board finally selected the four papers for Kagaku Kogaku Ronbunshu Paper Awards of 2009; those are the papers on "Prevention of Degradation of a Polymer Electrolyte Fuel Cell," " Release Behavior of Tantalum and Niobium from Refractory Metal Scrap during Chlorination," " In-situ Measurement of In-plane Temperature Distribution in a Polymer Electrolyte Fuel Cell by Thermography and Clarification of the Factors Causing the In-plane Temperature Distribution," and " Uniformization of Flow through a Honeycomb Structure by the Lattice Boltzmann Method."