A global perspective on the world science system (updated for 2006)

Loet Leydesdorff loet at LEYDESDORFF.NET
Sun Jan 28 15:32:52 EST 2007

 <http://www.leydesdorff.net/us_science/index.htm> Is the United States
losing ground in science? 
A global perspective on the world science system (updated for 2006)


Based on the Science Citation Index-Expanded web-version, the USA is still
by far the strongest nation in terms of scientific performance. Its relative
decline in percentage share of publications is largely due to the emergence
of China and other Asian nations. In 2006, China has become the second
largest nation in terms of the number of publications within this database.
In terms of citations, the competitive advantage of the American "domestic
market" is diminished, while the European Union (EU) is profiting more from
the enlargement of the database over time than the US. However, the USA is
still outperforming all other countries in terms of highly cited papers and
citation/publication ratios, and it is more successful than the EU in
coordinating its research efforts in strategic priority areas like
nanotechnology. In this field, 
China has become second largest in both numbers of papers published and
citations behind the USA. 
 <http://www.leydesdorff.net/us_science/us_science.pdf> <click here for pdf>

Loet Leydesdorff 
Amsterdam School of Communications Research (ASCoR)
Kloveniersburgwal 48, 1012 CX Amsterdam
Tel.: +31-20- 525 6598; fax: +31-20- 525 3681 
 <mailto:loet at leydesdorff.net> loet at leydesdorff.net ;
<http://www.leydesdorff.net/> http://www.leydesdorff.net/ 

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The Self-Organization of the Knowledge-Based Society;
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