Nanotechnologies in Pacific Asia: scientific production of People's Republic of China, Japan and South Korea.

.scientific performance in nanosciences and nanotechnologies in three Asian Pacific Countries - Popular Republic of China, South Korea and Japan - is analyzed with the use of indicators in order to assess mutual interrelation and differences between the three important scientific actors. Such indicators are calculated starting from a database built using a simple and meaningful boolean methodology. Several facts are highlighted by experimental activity: the rates of growth in fraction of global production show strong differences, while the three countries tend to avoid reciprocal collaborations. Also the dispersion of productivity among research centres show strong differences and different evolution with time. At the end of the work conclusions on the causes of findings are drawn.