Science Explorer Interactive view Map
Research facility · Xi'an · China

National Time Service Center

In research, National Time Service Center stands highest in Physical Sciences (#2,940 of 12,888 worldwide), Physics and Astronomy (#808 of 1,646 worldwide) and Engineering (#4,316 of 6,636 worldwide), 2022–2025. Relative to its size it is most specialised in Atomic and Molecular Physics, and Optics, Physics and Astronomy and Aerospace Engineering — Atomic and Molecular Physics, and Optics is 47.2× its share of world research.

english.ntsc.cas.cnROR OpenAlex
World rank, 2022–2025
#5,256
of 28,054 · #6,873 all time
Rank in China
#1,141
of 3,058
Research works
709
▲ 43% vs 2013–17
Citations
3.7k
5.3 per fractional work
Top-10% rate
20.2%
record average 16.5%
Open access
28%
world 28%

What is National Time Service Center known for in research?

The fields where it stands highest, 2022–2025, ranked among every institution above the floor in each field.

FieldWorld rankWhere that sitsTop-10% rateWorksAll time
Physical SciencesDomain #2,940 of 12,888 20.3%197 #4072
Physics and AstronomyField #808 of 1,646 15.9%81 #1717
EngineeringField #4,316 of 6,636 24.1%77 #5664
Atomic and Molecular Physics, and OpticsSubfield #469 of 565 13.2%68 #1344

Each strip is that field’s whole ranked pool, with the notch where National Time Service Center sits in it, in the colour of the band that rank falls in. The track under the rate is the rate itself: it carries no world mark, because the world rate differs by field (from about 6% to 21% in this record).

Which of those standings moved

The same fields on both windows: where it stood over the whole record, and where it stands in 2022–2025. The distance is the story, and it is the one thing the two rank columns above cannot show.

  1. Physical Sciences#4,072 #2,940
  2. Physics and Astronomy#1,717 #808
  3. Engineering#5,664 #4,316
  4. Atomic and Molecular Physics, and Optics#1,344 #469
all time2022–2025, better2022–2025, worse

A dot further right is a better standing. Fields it was not ranked in over the whole record are left out.

What does National Time Service Center specialise in?

Where its research is concentrated relative to its size: Atomic and Molecular Physics, and Optics takes 47.2× the share of its output that it takes of world research.

  1. Atomic and Molecular Physics, and OpticsSubfield · 68.3 works47×
  2. Physics and AstronomyField · 80.6 works18×
  3. Aerospace EngineeringSubfield · 36.9 works16×
← less than its size predicts1×more →

Location quotient, a volume reading rather than an impact one. It surfaces small, lopsided specialities.

Field profile

Location quotient across every field it publishes in: outside the ring is more than an institution of this size would be expected to publish, inside it is less.

Agricultural and Biological Sciences: 0.01× its world share, 0 worksAgricultural and Bio…Biochemistry, Genetics and Molecular Biology: 0.10× its world share, 1 worksBiochemistry, Geneti…Chemical Engineering: 0.16× its world share, 0 worksChemical EngineeringChemistry: 0.70× its world share, 2 worksChemistryComputer Science: 1.35× its world share, 21 worksComputer ScienceEarth and Planetary Sciences: 4.13× its world share, 13 worksEarth and Planetary …Engineering: 2.55× its world share, 77 worksEngineeringEnvironmental Science: 0.16× its world share, 2 worksEnvironmental ScienceMaterials Science: 0.01× its world share, 0 worksMaterials ScienceMathematics: 0.28× its world share, 1 worksMathematicsPhysics and Astronomy: 17.98× its world share, 81 worksPhysics and AstronomyHealth Professions: 0.06× its world share, 0 worksHealth ProfessionsMedicine: 0.04× its world share, 2 worksMedicineDecision Sciences: 0.56× its world share, 1 worksDecision SciencesPsychology: 0.03× its world share, 0 worksPsychologySocial Sciences: 0.02× its world share, 0 worksSocial Sciences1×world share
more than its size predictsabout as predictedless

Rings at 0.5×, 1× and 2×. Widest outward: Physics and Astronomy, 18.0×. Every wedge is a field page.

Who are the top researchers at National Time Service Center?

Ranked on the composite score, Xiao Xiang, Ruifang Dong and Jun Ruan lead among researchers whose main affiliation is National Time Service Center.

  1. 1 Xiao Xiang China · #642,031 worldwide 47 citations · 24 works
  2. 2 Ruifang Dong China · #955,456 worldwide 75 citations · 46 works
  3. 3 Jun Ruan China · #1,000,489 worldwide 11 citations · 18 works
  4. 4 Haifeng Jiang China · #1,025,722 worldwide 29 citations · 22 works
  5. 5 Xiaohui Li China · #1,050,901 worldwide 17 citations · 27 works
  6. 6 Linbo Zhang China · #1,051,005 worldwide 96 citations · 43 works
  7. 7 Shougang Zhang China · #1,074,873 worldwide 57 citations · 87 works
  8. 8 Yu Hua China · #1,100,361 worldwide 18 citations · 19 works
  9. 9 Xiaochun Lu China · #1,151,248 worldwide 30 citations · 45 works
  10. 10 Hong Chang China · #1,239,132 worldwide 33 citations · 29 works
All ranked researchers at National Time Service Center

Which keywords describe research at National Time Service Center?

By fractional works in 2022–2025, weighted toward what it does more of than the world: Geodesy, Atomic Clocks, Optical Clocks, Orbit Determination, Global Navigation Satellite Systems, GNSS, Microwave Photonics and Nonlinear Optics.

▲ more of its work than of the world’s◆ about the world’s share▼ less than the world’s

Size is fractional works in 2022–2025 in the topics tagged with each word; colour is the word's share of this institution's work against its share of the world's. The 40 words are chosen for being large and distinctive. Each links to the topic it comes from most.

All 40 words, with their numbers
  1. Geodesy31▲ 1071×2 topics
  2. Atomic Clocks31▲ 1799×1 topic
  3. Optical Clocks31▲ 1799×1 topic
  4. Orbit Determination20▲ 230×2 topics
  5. GNSS19▲ 459×1 topic
  6. Global Navigation Satellite Systems19▲ 386×1 topic
  7. Microwave Photonics12▲ 69×2 topics
  8. Nonlinear Optics11▲ 48×4 topics
  9. Magnetic Resonance Imaging11▲ 20×2 topics
  10. Atomic Magnetometer10▲ 161×1 topic
  11. Hyperpolarized Gases10▲ 161×1 topic
  12. Microresonators10▲ 64×3 topics
  13. Fiber Lasers10▲ 52×2 topics
  14. Wireless Sensor Networks10▲ 11×7 topics
  15. Optical Frequency Combs10▲ 90×1 topic
  16. Ultrafast Lasers10▲ 90×1 topic
  17. Sensor Fusion10▲ 45×2 topics
  18. Hydrological Modeling10▲ 20×4 topics
  19. Inertial Navigation Systems8▲ 153×1 topic
  20. Kalman Filtering8▲ 153×1 topic
  21. Geodetic Measurements8▲ 36×2 topics
  22. Quantum Information8▲ 33×3 topics
  23. Superfluidity8▲ 89×2 topics
  24. Bose-Einstein Condensation8▲ 107×2 topics
  25. Quantum Simulation8▲ 47×2 topics
  26. Sea Level Rise8▲ 29×2 topics
  27. GRACE7▲ 71×1 topic
  28. Optical Lattices7▲ 57×1 topic
  29. Ultracold Gases7▲ 139×1 topic
  30. groundwater depletion7▲ 71×1 topic
  31. Solar Wind6▲ 33×2 topics
  32. Electron Acceleration6▲ 45×2 topics
  33. Ionosphere6▲ 51×1 topic
  34. Magnetosphere6▲ 51×1 topic
  35. Electromagnetically Induced Transparency6▲ 144×1 topic
  36. Slow Light6▲ 57×1 topic
  37. Inertial Sensors4▲ 31×2 topics
  38. Indoor Localization4▲ 45×1 topic
  39. RF-Based Positioning4▲ 45×1 topic
  40. Optical Fiber4▲ 17×3 topics

Which research topics does National Time Service Center publish most on?

By volume in 2022–2025: Advanced Frequency and Time Standards, GNSS positioning and interference, Atomic and Subatomic Physics Research and Advanced Fiber Laser Technologies.

Advanced Frequency and T…31Advanced Frequency and Time Standards: 31 fractional worksGNSS positioning and int…19GNSS positioning and interference: 19 fractional worksAtomic and Subatomic Phy…10Atomic and Subatomic Physics Research: 10 fractional worksAdvanced Fiber Laser Technologies: 10 fractional worksInertial Sensor and Navigation: 8 fractional worksGeophysics and Gravity M…7Geophysics and Gravity Measurements: 7 fractional worksCold Atom Physics and Bose-Einstein Condensates: 7 fractional worksIonosphere and magnetosphere dynamics: 6 fractional worksQuantum optics and atomic interactions: 6 fractional worksIndoor and Outdoor Localization Technologies: 4 fractional works
Atomic and Molecular Physics, and OpticsAerospace EngineeringOceanographyAstronomy and Astrophysics1 others

Area is fractional works; colour is the subfield each topic belongs to.

  1. 1 Advanced Frequency and Time Standards Atomic and Molecular Physics, and Optics 31 works
  2. 2 GNSS positioning and interference Aerospace Engineering 19 works
  3. 3 Atomic and Subatomic Physics Research Atomic and Molecular Physics, and Optics 10 works
  4. 4 Advanced Fiber Laser Technologies Atomic and Molecular Physics, and Optics 10 works
  5. 5 Inertial Sensor and Navigation Aerospace Engineering 8 works
  6. 6 Geophysics and Gravity Measurements Oceanography 7 works
  7. 7 Cold Atom Physics and Bose-Einstein Condensates Atomic and Molecular Physics, and Optics 7 works
  8. 8 Ionosphere and magnetosphere dynamics Astronomy and Astrophysics 6 works
  9. 9 Quantum optics and atomic interactions Atomic and Molecular Physics, and Optics 6 works
  10. 10 Indoor and Outdoor Localization Technologies Electrical and Electronic Engineering 4 works

How open and international is its research?

Against the world’s own shares — the tick on each track. Both are shares of its output, so they sit on one scale and can be read against each other as well as against the world.

openly available28.2%not open71.8%

World: 28% of research is openly available.

with international co-authors10.2%domestic only89.8%

World: 19% is written across borders.

How has National Time Service Center's research output changed?

Output in 2018–2022 was 43% higher than in 2013–2017.

1990200020102020
grewheldshrank

The same series as a ribbon — one cell per year, darker for more. The line above answers how much; this answers when.

Other research institutions in Xi'an

All research institutions in Xi'an

Research measures only: rankings here say nothing about teaching, admissions or student experience. Comparable institutions and collaboration partners are in the interactive view on the map.