Just like they ranked engineering and technology institutions sometime ago, they have now ranked Indian universities (pdf), based on research publications indexed in / by SCOPUS. [Hat tip: Seema Singh]
Just like the previous exercise, they use p-index as a composite measure of quality and quantity of publications. p-index is defined as [C2P](1/3), where P is the number of publications in a given period, and C is the number of citations in a three-year window immediately after the publication date.
The top five (along with their p-index values) are:
University of Hyderabad (37)
Delhi University (32.7)
Panjab University (32.7)
Jadavpur Univerisity (30.3)
Banaras Hindu University (27.6)
The p-index is not normalized by the number of faculty. Thus, it privileges bigger institutions with larger faculty strengths.
In the top 25, one finds an interesting mix of Central Universities (UH, DU, BHU, JNU, AMU ...), State universities (Madras, Bombay, Calcutta, Jadavpur, Anna ...), medical institutions (CMC, Sanjay Gandhi PGIMS), and a science and tech university (Cochin U of S&T).
Tamil Nadu has five institutions in the top 25: Madras, Anna, Annamalai, CMC and Madurai Kamaraj.
Prathap and Gupta say, "... no private university has made it into this elite list." While Annamalai U and CMC Vellore may not be 'private' universities, they are not 'government' universities either.
The contribution of the top 25 universities to the research output from India has remained roughly the same during the two five-year periods: 17.5% during 1999-2003 and 18.3% during 2004-08. From the data given by them, we can back-calculate the average number of publications from India during these two periods: about 25,350 during 1999-2003 and 41,000 during 2004-08.