The scientific and technological activities of China have been growing so rapidly that China now takes the second place in the world concerning the number of researchers and third place concerning the expenditure on R&D. Regarding the growth rate in the production of papers, China has become the sixth largest producer in the world, and the world share of papers has increased by three times since the 1990s. In this paper, the authors will analyze the production of scientific papers and the factors behind the increased production of publication outputs by China. The authors will also look at the number of co-authored Papers between Japan and China. The results show that although the contributions of domestic institutes and foreign institutes to increasing papers remained at an approximately constant ratio in all papers, the contribution of foreign institutes declined in the top 10% of the most frequently cited papers and in higher share fields such as chemistry and materials. Furthermore, based on papers pu lished on high impact factor international journals, the authors show that researchers who came back from foreign countries contributed to increasing the number of publications. For internationally co-authored papers in China, the relative degree of contribution between Japan and the U.S.A. is changing. The relative position of the U.S. decreases and that for Japan increases. In those fields where China's share is higher in the world, Japan is in a higher position than the U.S. On the other hand, for internationally co-authored papers in Japan, China is in a higher position in the higher share fields. Therefore, the Japan-China relationship in co-authored papers deepens rapidly in the higher share fields such as chemistry, materials science, physics and engineering. In mathematics, China's share cf publications exceeds Japan, and the Japan-China relationship is not so close.
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