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Rank	World Rank	Institution	Papers	Citations	Citations per paper
1	19	Japan Science & Technology Agency	1,351	14,941	11.06
2	26	National University of Singapore	2,7	23,008	10.10
3	28	City University of Hong Kong	1,269	11,973	9.43
4	33	U of Science and Technology of China	1,598	13,016	8.15
5	34	Seoul National University	2,438	19,778	8.11
6	35	Nat Inst for Materials Science, Japan	3,722	,607	7.42
7	36	Kyoto University	2,630	19,269	7.33
8	38	Nat Inst of Advanced Industrial Science and Technology, Japan	4,345	31,324	7.21
9	39	Korea Adv Inst of Science and Tech	2,062	14,636	7.10
10	40	Kyushu University	1,666	11,717	7.03
11	42	National Tsing Hua University, Taiwan	1,591	10,890	6.84
12	43	Tokyo Institute of Technology	2,685	18,217	6.78
13	44	Tohoku University	5,603	37,888	6.76
14	45	University of Tokyo	3,071	20,742	6.75
15	47	Osaka University	3,668	23,985	6.54
16	48	Nanyang Tech University, Singapore	2,416	15,339	6.35
17	49	Yonsei University, South Korea	1,638	10,1	6.18
18	50	Jilin University, China	1,754	10,613	6.05
19	51	Chinese Academy of Sciences	13,039	72,690	5.57
20	52	Tsing Hua University, China	4,352	23,496	5.40
21	53	Nat. Cheng Kung University, Taiwan	2,092	10,583	5.06
22	54	Zhejiang University, China	2,398	10,818	4.51
23	56	Shanghai Jiao Tong University	3,044	10,580	3.48

The data above were extracted from the Essential Science Indicators database of Thomson Reuters. This database, currently covering the period 1 January 1999 through 30 April 2009, surveys only journal articles (original research reports and review articles) indexed by Thomson Reuters. Articles are assigned to a category based on the journals in which they were published and the Thomson Reuters journal-to-category field definition scheme. Both articles tabulated and citation counts to those articles are for the period indicated. Naturally, institutions publishing large numbers of papers have a greater likelihood of collecting more citations than those publishing fewer papers. This ranking is by citations per paper (impact), among those Asia-Pacific institutions that have collected 10,000 or more citations in materials science during the period. For papers with multiple institutional addresses, each institution receives full, not fractional, citation credit. Essential Science Indicators lists institutions ranked in the top 1 per cent for a field over a given period, based on total citations. For the current version, 604 institutions are listed in the field of materials science, meaning that a total of 60,400 institutions were surveyed to obtain these results. Of the 604, 57 institutions collected 10,000 or more citations and of these, 23, or 40 per cent, were located in the Asia-Pacific region. The breakdown by nations is: nine for Japan, seven for China, three for South Korea, and two each for Singapore and for Taiwan. The ranking by citations per paper (impact) seeks to reveal ¡°heavy hitters¡± based on per paper influence, not mere output. Also appearing is the world rank by impact for each of these Asia-Pacific institutions. For more information on the Thomson Reuters Essential Science Indicators database, see .