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University · Sofia · Bulgaria

Technical University of Sofia

In research, Technical University of Sofia stands highest in Engineering (#1,547 of 6,636 worldwide), Physical Sciences (#3,448 of 12,888 worldwide) and Computer Science (#1,944 of 4,667 worldwide), 2022–2025. Relative to its size it is most specialised in Industrial and Manufacturing Engineering, Automotive Engineering and Control and Systems Engineering — Industrial and Manufacturing Engineering is 9.6× its share of world research.

tu-sofia.bgROR OpenAlex
World rank, 2022–2025
#6,020
of 28,054 · #7,742 all time
Rank in Bulgaria
#6
of 92
Research works
8.4k
▲ 194% vs 2013–17
Citations
34k
4.0 per fractional work
Top-10% rate
4.6%
record average 16.5%
Open access
29%
world 28%

What is Technical University of Sofia 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
EngineeringField #1,547 of 6,636 4.0%1,477 #2576
Physical SciencesDomain #3,448 of 12,888 4.2%2,447 #4893
Computer ScienceField #1,944 of 4,667 4.9%529 #2580
Electrical and Electronic EngineeringSubfield #1,256 of 2,318 2.8%428 #1855
Social SciencesDomain #7,841 of 10,521 8.7%215 #10198
Control and Systems EngineeringSubfield #622 of 793 2.9%192 #1023
Mechanical EngineeringSubfield #1,098 of 1,351 2.9%197 #1985
Materials ScienceField #2,011 of 2,468 4.1%97 #2744
Information SystemsSubfield #1,091 of 1,291 8.5%81 #1938
EnergyField #606 of 694 2.4%87 #952

Each strip is that field’s whole ranked pool, with the notch where Technical University of Sofia 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. Engineering#2,576 #1,547
  2. Physical Sciences#4,893 #3,448
  3. Computer Science#2,580 #1,944
  4. Electrical and Electronic Engineering#1,855 #1,256
  5. Social Sciences#10,198 #7,841
  6. Control and Systems Engineering#1,023 #622
  7. Mechanical Engineering#1,985 #1,098
  8. Materials Science#2,744 #2,011
  9. Information Systems#1,938 #1,091
  10. Energy#952 #606
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 Technical University of Sofia specialise in?

Where its research is concentrated relative to its size: Industrial and Manufacturing Engineering takes 9.6× the share of its output that it takes of world research.

  1. Industrial and Manufacturing EngineeringSubfield · 141.1 works9.6×
  2. Automotive EngineeringSubfield · 98.5 works6.4×
  3. Control and Systems EngineeringSubfield · 191.6 works6.2×
← 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: 0.37× its world share, 50 worksAgricultural and Bio…Biochemistry, Genetics and Molecular Biology: 0.16× its world share, 25 worksBiochemistry, Geneti…Immunology and Microbiology: 0.01× its world share, 0 worksImmunology and Micro…Neuroscience: 0.38× its world share, 18 worksNeurosciencePharmacology, Toxicology and Pharmaceutics: 0.04× its world share, 0 worksPharmacology, Toxico…Chemical Engineering: 1.22× its world share, 12 worksChemical EngineeringChemistry: 0.21× its world share, 9 worksChemistryComputer Science: 2.38× its world share, 529 worksComputer ScienceEarth and Planetary Sciences: 0.36× its world share, 16 worksEarth and Planetary …Energy: 3.31× its world share, 87 worksEnergyEngineering: 3.44× its world share, 1,477 worksEngineeringEnvironmental Science: 0.81× its world share, 115 worksEnvironmental ScienceMaterials Science: 0.97× its world share, 97 worksMaterials ScienceMathematics: 1.39× its world share, 47 worksMathematicsPhysics and Astronomy: 0.90× its world share, 58 worksPhysics and AstronomyDentistry: 0.41× its world share, 6 worksDentistryHealth Professions: 0.17× its world share, 12 worksHealth ProfessionsMedicine: 0.15× its world share, 80 worksMedicineNursing: 0.17× its world share, 2 worksNursingVeterinary: 0.49× its world share, 2 worksVeterinaryArts and Humanities: 0.10× its world share, 8 worksArts and HumanitiesBusiness, Management and Accounting: 0.82× its world share, 76 worksBusiness, Management…Decision Sciences: 1.30× its world share, 36 worksDecision SciencesEconomics, Econometrics and Finance: 0.39× its world share, 24 worksEconomics, Econometr…Psychology: 0.21× its world share, 18 worksPsychologySocial Sciences: 0.15× its world share, 54 worksSocial Sciences1×world share
more than its size predictsabout as predictedless

Rings at 0.5×, 1× and 2×. Widest outward: Engineering, 3.4×. Every wedge is a field page.

Who are the top researchers at Technical University of Sofia?

Ranked on the composite score, Л. Дімітров, Zahari Zarkov and Georgi Todorov lead among researchers whose main affiliation is Technical University of Sofia.

  1. 1 Л. Дімітров Bulgaria · #206,883 worldwide 238 citations · 74 works
  2. 2 Zahari Zarkov Bulgaria · #275,560 worldwide 180 citations · 19 works
  3. 3 Georgi Todorov Bulgaria · #425,164 worldwide 51 citations · 33 works
  4. 4 Vladimir Todorov Bulgaria · #442,565 worldwide 65 citations · 37 works
  5. 5 Ivan M. Uzunov Bulgaria · #537,777 worldwide 115 citations · 36 works
  6. 6 Vladimir Poulkov Bulgaria · #666,945 worldwide 60 citations · 58 works
  7. 7 Georgi Iliev Bulgaria · #715,182 worldwide 25 citations · 21 works
  8. 8 Valeri Mladenov Bulgaria · #723,854 worldwide 141 citations · 84 works
  9. 9 Georgi Nikolov Bulgaria · #730,820 worldwide 30 citations · 21 works
  10. 10 Kiril Anguelov Bulgaria · #782,918 worldwide 29 citations · 16 works
All ranked researchers at Technical University of Sofia

Which keywords describe research at Technical University of Sofia?

By fractional works in 2022–2025, weighted toward what it does more of than the world: Renewable Energy, Energy Efficiency, Deep Learning, Power Electronics, Machine Learning, Neural Networks, Control Systems and Renewable Energy Integration.

▲ 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. Deep Learning230▲ 2.4×74 topics
  2. Machine Learning214▲ 2.3×81 topics
  3. Renewable Energy205▲ 5.0×40 topics
  4. Energy Efficiency173▲ 6.4×40 topics
  5. Neural Networks159▲ 3.6×37 topics
  6. Sustainability143▲ 2.0×47 topics
  7. Power Electronics123▲ 13×8 topics
  8. Internet of Things92▲ 3.7×22 topics
  9. Optimization89▲ 6.7×24 topics
  10. Control Systems85▲ 16×12 topics
  11. Renewable Energy Integration85▲ 8.8×6 topics
  12. Big Data80▲ 3.1×24 topics
  13. Artificial Intelligence80▲ 2.0×41 topics
  14. Artificial Neural Networks74▲ 5.5×9 topics
  15. Smart Grid72▲ 6.6×9 topics
  16. Model Predictive Control71▲ 9.5×6 topics
  17. Cyber-Physical Systems67▲ 8.9×9 topics
  18. Security63▲ 3.4×20 topics
  19. Thermal Analysis63▲ 17×9 topics
  20. Electric Vehicles57▲ 6.8×4 topics
  21. IoT52▲ 4.9×16 topics
  22. Wireless Sensor Networks45▲ 3.5×19 topics
  23. Tool Wear44▲ 11×3 topics
  24. Thermal Management44▲ 4.6×8 topics
  25. Machine Tools43▲ 22×3 topics
  26. Fault Tolerance42▲ 9.4×7 topics
  27. IoT Security42▲ 4.6×3 topics
  28. Reliability41▲ 18×3 topics
  29. Smart Home40▲ 8.3×4 topics
  30. Simulation40▲ 5.4×15 topics
  31. Electric Drives40▲ 34×2 topics
  32. Photovoltaic Systems38▲ 15×3 topics
  33. Electric Vehicle Charging37▲ 15×2 topics
  34. Parameter Estimation36▲ 10×6 topics
  35. Industry 4.035▲ 23×3 topics
  36. Efficiency Optimization33▲ 24×2 topics
  37. Mathematical Modeling32▲ 13×4 topics
  38. Virtual Prototyping32▲ 12×2 topics
  39. Diagnostics31▲ 13×3 topics
  40. DC-DC Converters30▲ 19×1 topic

Which research topics does Technical University of Sofia publish most on?

By volume in 2022–2025: Advanced DC-DC Converters, Manufacturing Process and Optimization, Engineering Technology and Methodologies and Electric Power Systems and Control.

Advanced DC-DC Converters30Advanced DC-DC Converters: 30 fractional worksManufacturing Process an…30Manufacturing Process and Optimization: 30 fractional worksEngineering Technology and Methodologies: 30 fractional worksElectric Power Systems a…28Electric Power Systems and Control: 28 fractional worksInduction Heating and In…27Induction Heating and Inverter Technology: 27 fractional worksImpact of Light on Environment and Health: 26 fractional worksAdvanced Battery Technologies Research: 26 fractional worksMultilevel Inverters and…21Multilevel Inverters and Converters: 21 fractional worksAdditive Manufacturing and 3D Printing Technologies: 20 fractional worksDigital Transformation in Industry: 20 fractional works
Electrical and Electronic EngineeringIndustrial and Manufacturing EngineeringMechanical EngineeringGlobal and Planetary Change1 others

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

  1. 1 Advanced DC-DC Converters Electrical and Electronic Engineering 30 works
  2. 2 Manufacturing Process and Optimization Industrial and Manufacturing Engineering 30 works
  3. 3 Engineering Technology and Methodologies Industrial and Manufacturing Engineering 30 works
  4. 4 Electric Power Systems and Control Electrical and Electronic Engineering 28 works
  5. 5 Induction Heating and Inverter Technology Mechanical Engineering 27 works
  6. 6 Impact of Light on Environment and Health Global and Planetary Change 26 works
  7. 7 Advanced Battery Technologies Research Automotive Engineering 26 works
  8. 8 Multilevel Inverters and Converters Electrical and Electronic Engineering 21 works
  9. 9 Additive Manufacturing and 3D Printing Technologies Automotive Engineering 20 works
  10. 10 Digital Transformation in Industry Industrial and Manufacturing Engineering 20 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 available28.7%not open71.3%

World: 28% of research is openly available.

with international co-authors13.9%domestic only86.1%

World: 19% is written across borders.

How has Technical University of Sofia's research output changed?

Output in 2018–2022 was 194% 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 Sofia

All research institutions in Sofia

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.