National Astronomical Observatories, Chinese Academy of Sciences

Xinjiang Astronomical Observatory, Chinese Academy of Sciences

Are you a researcher?

Create a profile to get free access to personal recommendations for colleagues and new articles.

Xinjiang Astronomical Observatory, Chinese Academy of Sciences

Short name

XAO CAS

Country, city

China, Ürümqi

01pjxkf30

Organization website

Publications

1 188

Citations

18 957

h-index

Top-3 journals

Monthly Notices of the Royal Astronomical Society (190 publications)

Astrophysical Journal (173 publications)

Research in Astronomy and Astrophysics (129 publications)

Top-3 organizations

University of Chinese Academy of Sciences (408 publications)

National Astronomical Observatories, Chinese Academy of Sciences (288 publications)

Shanghai Astronomical Observatory, Chinese Academy of Sciences (164 publications)

Top-3 foreign organizations

Max Planck Institute for Radio Astronomy (145 publications)

Commonwealth Scientific and Industrial Research Organization (93 publications)

Netherlands Institute for Radio Astronomy (63 publications)

Most cited in 5 years

Found

Publication title

Publisher

Journal

Countries

Found

Since 2011

Total publications

1188

Total citations

18957

Citations per publication

15.96

Average publications per year

74.25

Average authors per publication

12.2

h-index

Metrics description

h-index

A scientist has an h-index if h of his N publications are cited at least h times each, while the remaining (N - h) publications are cited no more than h times each.

https://www.pnas.org/doi/full/10.1073/pnas.0507655102

Top-30

Fields of science

	100 200 300 400 500 600 700
Astronomy and Astrophysics	Astronomy and Astrophysics, 686, 57.74% Astronomy and Astrophysics 686 publications, 57.74%
Space and Planetary Science	Space and Planetary Science, 665, 55.98% Space and Planetary Science 665 publications, 55.98%
General Physics and Astronomy	General Physics and Astronomy, 43, 3.62% General Physics and Astronomy 43 publications, 3.62%
Electrical and Electronic Engineering	Electrical and Electronic Engineering, 27, 2.27% Electrical and Electronic Engineering 27 publications, 2.27%
Multidisciplinary	Multidisciplinary, 22, 1.85% Multidisciplinary 22 publications, 1.85%
Instrumentation	Instrumentation, 14, 1.18% Instrumentation 14 publications, 1.18%
Nuclear and High Energy Physics	Nuclear and High Energy Physics, 10, 0.84% Nuclear and High Energy Physics 10 publications, 0.84%
Physical and Theoretical Chemistry	Physical and Theoretical Chemistry, 9, 0.76% Physical and Theoretical Chemistry 9 publications, 0.76%
Computer Science Applications	Computer Science Applications, 8, 0.67% Computer Science Applications 8 publications, 0.67%
General Medicine	General Medicine, 8, 0.67% General Medicine 8 publications, 0.67%
Atomic and Molecular Physics, and Optics	Atomic and Molecular Physics, and Optics, 8, 0.67% Atomic and Molecular Physics, and Optics 8 publications, 0.67%
Condensed Matter Physics	Condensed Matter Physics, 8, 0.67% Condensed Matter Physics 8 publications, 0.67%
General Engineering	General Engineering, 8, 0.67% General Engineering 8 publications, 0.67%
General Materials Science	General Materials Science, 7, 0.59% General Materials Science 7 publications, 0.59%
Mechanical Engineering	Mechanical Engineering, 7, 0.59% Mechanical Engineering 7 publications, 0.59%
Geophysics	Geophysics, 6, 0.51% Geophysics 6 publications, 0.51%
General Chemistry	General Chemistry, 5, 0.42% General Chemistry 5 publications, 0.42%
Aerospace Engineering	Aerospace Engineering, 5, 0.42% Aerospace Engineering 5 publications, 0.42%
General Earth and Planetary Sciences	General Earth and Planetary Sciences, 5, 0.42% General Earth and Planetary Sciences 5 publications, 0.42%
Electronic, Optical and Magnetic Materials	Electronic, Optical and Magnetic Materials, 3, 0.25% Electronic, Optical and Magnetic Materials 3 publications, 0.25%
Analytical Chemistry	Analytical Chemistry, 3, 0.25% Analytical Chemistry 3 publications, 0.25%
Physics and Astronomy (miscellaneous)	Physics and Astronomy (miscellaneous), 3, 0.25% Physics and Astronomy (miscellaneous) 3 publications, 0.25%
Mathematical Physics	Mathematical Physics, 3, 0.25% Mathematical Physics 3 publications, 0.25%
Renewable Energy, Sustainability and the Environment	Renewable Energy, Sustainability and the Environment, 3, 0.25% Renewable Energy, Sustainability and the Environment 3 publications, 0.25%
Artificial Intelligence	Artificial Intelligence, 3, 0.25% Artificial Intelligence 3 publications, 0.25%
Applied Mathematics	Applied Mathematics, 3, 0.25% Applied Mathematics 3 publications, 0.25%
Control and Systems Engineering	Control and Systems Engineering, 3, 0.25% Control and Systems Engineering 3 publications, 0.25%
Experimental and Cognitive Psychology	Experimental and Cognitive Psychology, 3, 0.25% Experimental and Cognitive Psychology 3 publications, 0.25%
Engineering (miscellaneous)	Engineering (miscellaneous), 3, 0.25% Engineering (miscellaneous) 3 publications, 0.25%
Computer Vision and Pattern Recognition	Computer Vision and Pattern Recognition, 3, 0.25% Computer Vision and Pattern Recognition 3 publications, 0.25%
	100 200 300 400 500 600 700

Journals

	20 40 60 80 100 120 140 160 180 200
Monthly Notices of the Royal Astronomical Society	Monthly Notices of the Royal Astronomical Society, 190, 15.99% Monthly Notices of the Royal Astronomical Society 190 publications, 15.99%
Astrophysical Journal	Astrophysical Journal, 173, 14.56% Astrophysical Journal 173 publications, 14.56%
Research in Astronomy and Astrophysics	Research in Astronomy and Astrophysics, 129, 10.86% Research in Astronomy and Astrophysics 129 publications, 10.86%
Astronomy and Astrophysics	Astronomy and Astrophysics, 115, 9.68% Astronomy and Astrophysics 115 publications, 9.68%
Astrophysics and Space Science	Astrophysics and Space Science, 51, 4.29% Astrophysics and Space Science 51 publications, 4.29%
Astronomische Nachrichten	Astronomische Nachrichten, 38, 3.2% Astronomische Nachrichten 38 publications, 3.2%
Proceedings of the International Astronomical Union	Proceedings of the International Astronomical Union, 34, 2.86% Proceedings of the International Astronomical Union 34 publications, 2.86%
Astrophysical Journal Letters	Astrophysical Journal Letters, 27, 2.27% Astrophysical Journal Letters 27 publications, 2.27%
Astrophysical Journal, Supplement Series	Astrophysical Journal, Supplement Series, 27, 2.27% Astrophysical Journal, Supplement Series 27 publications, 2.27%
Astronomical Journal	Astronomical Journal, 24, 2.02% Astronomical Journal 24 publications, 2.02%
Universe	Universe, 19, 1.6% Universe 19 publications, 1.6%
Science China: Physics, Mechanics and Astronomy	Science China: Physics, Mechanics and Astronomy, 13, 1.09% Science China: Physics, Mechanics and Astronomy 13 publications, 1.09%
Scientia Sinica: Physica, Mechanica et Astronomica	Scientia Sinica: Physica, Mechanica et Astronomica, 13, 1.09% Scientia Sinica: Physica, Mechanica et Astronomica 13 publications, 1.09%
Journal of Astrophysics and Astronomy	Journal of Astrophysics and Astronomy, 12, 1.01% Journal of Astrophysics and Astronomy 12 publications, 1.01%
Publications of the Astronomical Society of the Pacific	Publications of the Astronomical Society of the Pacific, 11, 0.93% Publications of the Astronomical Society of the Pacific 11 publications, 0.93%
Nature	Nature, 11, 0.93% Nature 11 publications, 0.93%
Frontiers in Astronomy and Space Sciences	Frontiers in Astronomy and Space Sciences, 10, 0.84% Frontiers in Astronomy and Space Sciences 10 publications, 0.84%
Advances in Astronomy	Advances in Astronomy, 10, 0.84% Advances in Astronomy 10 publications, 0.84%
Monthly Notices of the Royal Astronomical Society: Letters	Monthly Notices of the Royal Astronomical Society: Letters, 10, 0.84% Monthly Notices of the Royal Astronomical Society: Letters 10 publications, 0.84%
Publications of the Astronomical Society of Australia	Publications of the Astronomical Society of Australia, 9, 0.76% Publications of the Astronomical Society of Australia 9 publications, 0.76%
Physical Review D	Physical Review D, 9, 0.76% Physical Review D 9 publications, 0.76%
Galaxies	Galaxies, 8, 0.67% Galaxies 8 publications, 0.67%
IEEE Transactions on Antennas and Propagation	IEEE Transactions on Antennas and Propagation, 7, 0.59% IEEE Transactions on Antennas and Propagation 7 publications, 0.59%
Publication of the Astronomical Society of Japan	Publication of the Astronomical Society of Japan, 7, 0.59% Publication of the Astronomical Society of Japan 7 publications, 0.59%
Science	Science, 7, 0.59% Science 7 publications, 0.59%
Chinese Astronomy and Astrophysics	Chinese Astronomy and Astrophysics, 7, 0.59% Chinese Astronomy and Astrophysics 7 publications, 0.59%
Nature Astronomy	Nature Astronomy, 7, 0.59% Nature Astronomy 7 publications, 0.59%
Chinese Physics B	Chinese Physics B, 6, 0.51% Chinese Physics B 6 publications, 0.51%
Astronomy and Computing	Astronomy and Computing, 6, 0.51% Astronomy and Computing 6 publications, 0.51%
International Journal of Antennas and Propagation	International Journal of Antennas and Propagation, 5, 0.42% International Journal of Antennas and Propagation 5 publications, 0.42%
	20 40 60 80 100 120 140 160 180 200

Publishers

	50 100 150 200 250
American Astronomical Society	American Astronomical Society, 244, 20.54% American Astronomical Society 244 publications, 20.54%
Oxford University Press	Oxford University Press, 208, 17.51% Oxford University Press 208 publications, 17.51%
IOP Publishing	IOP Publishing, 170, 14.31% IOP Publishing 170 publications, 14.31%
EDP Sciences	EDP Sciences, 116, 9.76% EDP Sciences 116 publications, 9.76%
Springer Nature	Springer Nature, 115, 9.68% Springer Nature 115 publications, 9.68%
Elsevier	Elsevier, 57, 4.8% Elsevier 57 publications, 4.8%
Cambridge University Press	Cambridge University Press, 44, 3.7% Cambridge University Press 44 publications, 3.7%
Wiley	Wiley, 43, 3.62% Wiley 43 publications, 3.62%
MDPI	MDPI, 40, 3.37% MDPI 40 publications, 3.37%
Science in China Press	Science in China Press, 23, 1.94% Science in China Press 23 publications, 1.94%
Institute of Electrical and Electronics Engineers (IEEE)	Institute of Electrical and Electronics Engineers (IEEE), 20, 1.68% Institute of Electrical and Electronics Engineers (IEEE) 20 publications, 1.68%
Hindawi Limited	Hindawi Limited, 18, 1.52% Hindawi Limited 18 publications, 1.52%
American Physical Society (APS)	American Physical Society (APS), 16, 1.35% American Physical Society (APS) 16 publications, 1.35%
World Scientific	World Scientific, 11, 0.93% World Scientific 11 publications, 0.93%
Frontiers Media S.A.	Frontiers Media S.A., 11, 0.93% Frontiers Media S.A. 11 publications, 0.93%
American Association for the Advancement of Science (AAAS)	American Association for the Advancement of Science (AAAS), 9, 0.76% American Association for the Advancement of Science (AAAS) 9 publications, 0.76%
AIP Publishing	AIP Publishing, 9, 0.76% AIP Publishing 9 publications, 0.76%
Royal Society of Chemistry (RSC)	Royal Society of Chemistry (RSC), 8, 0.67% Royal Society of Chemistry (RSC) 8 publications, 0.67%
Taylor & Francis	Taylor & Francis, 3, 0.25% Taylor & Francis 3 publications, 0.25%
Pleiades Publishing	Pleiades Publishing, 3, 0.25% Pleiades Publishing 3 publications, 0.25%
American Geophysical Union	American Geophysical Union, 3, 0.25% American Geophysical Union 3 publications, 0.25%
SPIE-Intl Soc Optical Eng	SPIE-Intl Soc Optical Eng, 3, 0.25% SPIE-Intl Soc Optical Eng 3 publications, 0.25%
SAGE	SAGE, 2, 0.17% SAGE 2 publications, 0.17%
American Chemical Society (ACS)	American Chemical Society (ACS), 2, 0.17% American Chemical Society (ACS) 2 publications, 0.17%
Institution of Engineering and Technology (IET)	Institution of Engineering and Technology (IET), 2, 0.17% Institution of Engineering and Technology (IET) 2 publications, 0.17%
Proceedings of the National Academy of Sciences (PNAS)	Proceedings of the National Academy of Sciences (PNAS), 2, 0.17% Proceedings of the National Academy of Sciences (PNAS) 2 publications, 0.17%
Brill	Brill, 1, 0.08% Brill 1 publication, 0.08%
IWA Publishing	IWA Publishing, 1, 0.08% IWA Publishing 1 publication, 0.08%
Association for Research in Vision and Ophthalmology (ARVO)	Association for Research in Vision and Ophthalmology (ARVO), 1, 0.08% Association for Research in Vision and Ophthalmology (ARVO) 1 publication, 0.08%
Astronomical Observatory	Astronomical Observatory, 1, 0.08% Astronomical Observatory 1 publication, 0.08%
	50 100 150 200 250

With other organizations

	50 100 150 200 250 300 350 400 450
University of Chinese Academy of Sciences	University of Chinese Academy of Sciences, 408, 34.34% University of Chinese Academy of Sciences 408 publications, 34.34%
National Astronomical Observatories, Chinese Academy of Sciences	National Astronomical Observatories, Chinese Academy of Sciences, 288, 24.24% National Astronomical Observatories, Chinese Academy of Sciences 288 publications, 24.24%
Shanghai Astronomical Observatory, Chinese Academy of Sciences	Shanghai Astronomical Observatory, Chinese Academy of Sciences, 164, 13.8% Shanghai Astronomical Observatory, Chinese Academy of Sciences 164 publications, 13.8%
Max Planck Institute for Radio Astronomy	Max Planck Institute for Radio Astronomy, 145, 12.21% Max Planck Institute for Radio Astronomy 145 publications, 12.21%
Peking University	Peking University, 141, 11.87% Peking University 141 publications, 11.87%
Purple Mountain Observatory, Chinese Academy of Sciences	Purple Mountain Observatory, Chinese Academy of Sciences, 125, 10.52% Purple Mountain Observatory, Chinese Academy of Sciences 125 publications, 10.52%
Nanjing University	Nanjing University, 113, 9.51% Nanjing University 113 publications, 9.51%
Beijing Normal University	Beijing Normal University, 96, 8.08% Beijing Normal University 96 publications, 8.08%
Commonwealth Scientific and Industrial Research Organization	Commonwealth Scientific and Industrial Research Organization, 93, 7.83% Commonwealth Scientific and Industrial Research Organization 93 publications, 7.83%
Guizhou Normal University	Guizhou Normal University, 76, 6.4% Guizhou Normal University 76 publications, 6.4%
Yunnan Observatories, Chinese Academy of Sciences	Yunnan Observatories, Chinese Academy of Sciences, 70, 5.89% Yunnan Observatories, Chinese Academy of Sciences 70 publications, 5.89%
Guangzhou University	Guangzhou University, 69, 5.81% Guangzhou University 69 publications, 5.81%
Xinjiang University	Xinjiang University, 66, 5.56% Xinjiang University 66 publications, 5.56%
Netherlands Institute for Radio Astronomy	Netherlands Institute for Radio Astronomy, 63, 5.3% Netherlands Institute for Radio Astronomy 63 publications, 5.3%
National Astronomical Observatory of Japan	National Astronomical Observatory of Japan, 57, 4.8% National Astronomical Observatory of Japan 57 publications, 4.8%
Institute of High Energy Physics, Chinese Academy of Sciences	Institute of High Energy Physics, Chinese Academy of Sciences, 54, 4.55% Institute of High Energy Physics, Chinese Academy of Sciences 54 publications, 4.55%
University of Science and Technology of China	University of Science and Technology of China, 54, 4.55% University of Science and Technology of China 54 publications, 4.55%
Chalmers University of Technology	Chalmers University of Technology, 52, 4.38% Chalmers University of Technology 52 publications, 4.38%
University of Manchester	University of Manchester, 50, 4.21% University of Manchester 50 publications, 4.21%
Xidian University	Xidian University, 47, 3.96% Xidian University 47 publications, 3.96%
Yunnan University	Yunnan University, 46, 3.87% Yunnan University 46 publications, 3.87%
Korea Astronomy and Space Science Institute	Korea Astronomy and Space Science Institute, 45, 3.79% Korea Astronomy and Space Science Institute 45 publications, 3.79%
California Institute of Technology	California Institute of Technology, 44, 3.7% California Institute of Technology 44 publications, 3.7%
National Institute for Astrophysics	National Institute for Astrophysics, 41, 3.45% National Institute for Astrophysics 41 publications, 3.45%
National Radio Astronomy Observatory	National Radio Astronomy Observatory, 40, 3.37% National Radio Astronomy Observatory 40 publications, 3.37%
Sun Yat-sen University	Sun Yat-sen University, 39, 3.28% Sun Yat-sen University 39 publications, 3.28%
Tsinghua University	Tsinghua University, 36, 3.03% Tsinghua University 36 publications, 3.03%
Swinburne University of Technology	Swinburne University of Technology, 36, 3.03% Swinburne University of Technology 36 publications, 3.03%
King Abdulaziz University	King Abdulaziz University, 35, 2.95% King Abdulaziz University 35 publications, 2.95%
Ludong University	Ludong University, 31, 2.61% Ludong University 31 publications, 2.61%
	50 100 150 200 250 300 350 400 450

With foreign organizations

	20 40 60 80 100 120 140 160
Max Planck Institute for Radio Astronomy	Max Planck Institute for Radio Astronomy, 145, 12.21% Max Planck Institute for Radio Astronomy 145 publications, 12.21%
Commonwealth Scientific and Industrial Research Organization	Commonwealth Scientific and Industrial Research Organization, 93, 7.83% Commonwealth Scientific and Industrial Research Organization 93 publications, 7.83%
Netherlands Institute for Radio Astronomy	Netherlands Institute for Radio Astronomy, 63, 5.3% Netherlands Institute for Radio Astronomy 63 publications, 5.3%
National Astronomical Observatory of Japan	National Astronomical Observatory of Japan, 57, 4.8% National Astronomical Observatory of Japan 57 publications, 4.8%
Chalmers University of Technology	Chalmers University of Technology, 52, 4.38% Chalmers University of Technology 52 publications, 4.38%
University of Manchester	University of Manchester, 50, 4.21% University of Manchester 50 publications, 4.21%
Korea Astronomy and Space Science Institute	Korea Astronomy and Space Science Institute, 45, 3.79% Korea Astronomy and Space Science Institute 45 publications, 3.79%
California Institute of Technology	California Institute of Technology, 44, 3.7% California Institute of Technology 44 publications, 3.7%
National Institute for Astrophysics	National Institute for Astrophysics, 41, 3.45% National Institute for Astrophysics 41 publications, 3.45%
National Radio Astronomy Observatory	National Radio Astronomy Observatory, 40, 3.37% National Radio Astronomy Observatory 40 publications, 3.37%
Swinburne University of Technology	Swinburne University of Technology, 36, 3.03% Swinburne University of Technology 36 publications, 3.03%
King Abdulaziz University	King Abdulaziz University, 35, 2.95% King Abdulaziz University 35 publications, 2.95%
Center for Astrophysics \| Harvard & Smithsonian	Center for Astrophysics \| Harvard & Smithsonian, 31, 2.61% Center for Astrophysics \| Harvard & Smithsonian 31 publications, 2.61%
University of Tokyo	University of Tokyo, 31, 2.61% University of Tokyo 31 publications, 2.61%
University of California, Berkeley	University of California, Berkeley, 30, 2.53% University of California, Berkeley 30 publications, 2.53%
Curtin University	Curtin University, 28, 2.36% Curtin University 28 publications, 2.36%
University of KwaZulu-Natal	University of KwaZulu-Natal, 28, 2.36% University of KwaZulu-Natal 28 publications, 2.36%
Jet Propulsion Laboratory	Jet Propulsion Laboratory, 28, 2.36% Jet Propulsion Laboratory 28 publications, 2.36%
Al Farabi Kazakh National University	Al Farabi Kazakh National University, 26, 2.19% Al Farabi Kazakh National University 26 publications, 2.19%
Western Sydney University	Western Sydney University, 26, 2.19% Western Sydney University 26 publications, 2.19%
The Graduate University for Advanced Studies	The Graduate University for Advanced Studies, 26, 2.19% The Graduate University for Advanced Studies 26 publications, 2.19%
University College London	University College London, 25, 2.1% University College London 25 publications, 2.1%
University of Sydney	University of Sydney, 22, 1.85% University of Sydney 22 publications, 1.85%
Monash University	Monash University, 22, 1.85% Monash University 22 publications, 1.85%
Institute of Astrophysics of Andalusia	Institute of Astrophysics of Andalusia, 21, 1.77% Institute of Astrophysics of Andalusia 21 publications, 1.77%
Radboud University Nijmegen	Radboud University Nijmegen, 20, 1.68% Radboud University Nijmegen 20 publications, 1.68%
West Virginia University	West Virginia University, 20, 1.68% West Virginia University 20 publications, 1.68%
University of California, San Diego	University of California, San Diego, 19, 1.6% University of California, San Diego 19 publications, 1.6%
Ural Federal University	Ural Federal University, 18, 1.52% Ural Federal University 18 publications, 1.52%
Massachusetts Institute of Technology	Massachusetts Institute of Technology, 18, 1.52% Massachusetts Institute of Technology 18 publications, 1.52%
	20 40 60 80 100 120 140 160

With other countries

	20 40 60 80 100 120 140 160 180
USA	USA, 175, 14.73% USA 175 publications, 14.73%
Germany	Germany, 153, 12.88% Germany 153 publications, 12.88%
Australia	Australia, 125, 10.52% Australia 125 publications, 10.52%
United Kingdom	United Kingdom, 83, 6.99% United Kingdom 83 publications, 6.99%
Netherlands	Netherlands, 79, 6.65% Netherlands 79 publications, 6.65%
Japan	Japan, 58, 4.88% Japan 58 publications, 4.88%
Italy	Italy, 51, 4.29% Italy 51 publications, 4.29%
South Africa	South Africa, 43, 3.62% South Africa 43 publications, 3.62%
Canada	Canada, 41, 3.45% Canada 41 publications, 3.45%
Sweden	Sweden, 41, 3.45% Sweden 41 publications, 3.45%
Republic of Korea	Republic of Korea, 40, 3.37% Republic of Korea 40 publications, 3.37%
Spain	Spain, 37, 3.11% Spain 37 publications, 3.11%
France	France, 35, 2.95% France 35 publications, 2.95%
Russia	Russia, 33, 2.78% Russia 33 publications, 2.78%
Saudi Arabia	Saudi Arabia, 29, 2.44% Saudi Arabia 29 publications, 2.44%
Chile	Chile, 25, 2.1% Chile 25 publications, 2.1%
India	India, 24, 2.02% India 24 publications, 2.02%
Hungary	Hungary, 20, 1.68% Hungary 20 publications, 1.68%
Poland	Poland, 18, 1.52% Poland 18 publications, 1.52%
Kazakhstan	Kazakhstan, 16, 1.35% Kazakhstan 16 publications, 1.35%
Israel	Israel, 15, 1.26% Israel 15 publications, 1.26%
Finland	Finland, 14, 1.18% Finland 14 publications, 1.18%
Mexico	Mexico, 13, 1.09% Mexico 13 publications, 1.09%
Belgium	Belgium, 11, 0.93% Belgium 11 publications, 0.93%
Ireland	Ireland, 11, 0.93% Ireland 11 publications, 0.93%
New Zealand	New Zealand, 10, 0.84% New Zealand 10 publications, 0.84%
Thailand	Thailand, 9, 0.76% Thailand 9 publications, 0.76%
Georgia	Georgia, 8, 0.67% Georgia 8 publications, 0.67%
Vietnam	Vietnam, 7, 0.59% Vietnam 7 publications, 0.59%
	20 40 60 80 100 120 140 160 180

We do not take into account publications without a DOI.
Statistics recalculated daily.
Publications published earlier than 2011 are ignored in the statistics.
The horizontal charts show the 30 top positions.
Journals quartiles values are relevant at the moment.