Outstanding Paper Awards Subcommittee of Kagaku Kogaku Ronbunshu has assessed the 74 papers published in 2005, corresponding to volume 31, and selected the candidates of the award. As a result, the editorial board finally selected the three papers for Kagaku Kogaku Ronbunshu Paper Awards of 2005; those are the papers on "effects of flow phases of methanol on the performance of the direct methanol fuel cell", "the assessment of micro-mixing of wet particles", and "the development of a novel static micromixer".