| 1 | Materials | 1,227 | 38.0K | 129 | 228 |
| 2 | Chemical Engineering | 761 | 24.4K | 88 | 147 |
| 3 | Chemistry | 767 | 20.9K | 599 | 894 |
| 4 | Catalysis | 597 | 19.6K | 97 | 183 |
| 5 | Materials Science | 523 | 15.0K | 187 | 278 |
| 6 | Biochemical Engineering | 327 | 14.5K | 78 | 218 |
| 7 | Nanotechnology | 411 | 12.9K | 301 | 482 |
| 8 | coal | 399 | 12.2K | 11 | 17 |
| 9 | Biocompatible Materials | 259 | 10.5K | 265 | 358 |
| 10 | Optical materials | 251 | 9.5K | 103 | 161 |
| 11 | Electrochemistry | 300 | 9.0K | 281 | 231 |
| 12 | Physics | 500 | 7.8K | 885 | 2266 |
| 13 | Surface Chemistry | 334 | 7.7K | 166 | 295 |
| 14 | Nanostructured Materials | 240 | 7.3K | 197 | 283 |
| 15 | Colloids | 264 | 7.1K | 228 | 354 |
| 16 | Analytical Chemistry | 216 | 6.7K | 397 | 434 |
| 17 | Energy Policy | 205 | 5.8K | 64 | 194 |
| 18 | nanoscience | 141 | 5.8K | 277 | 381 |
| 19 | Building Materials | 160 | 5.3K | 71 | 125 |
| 20 | Optics | 287 | 5.0K | 457 | 446 |
| 21 | Metals | 156 | 4.9K | 178 | 211 |
| 22 | China | 306 | 4.9K | 100 | 112 |
| 23 | Composite Materials | 126 | 4.9K | 289 | 317 |
| 23 | Magnetic Materials | 135 | 4.9K | 63 | 57 |
| 25 | Rock Mechanics | 108 | 4.2K | 55 | 63 |
| 26 | Environment | 99 | 4.1K | 854 | 1176 |
| 27 | Metallurgy | 168 | 3.8K | 192 | 283 |
| 28 | Pollution | 112 | 3.6K | 891 | 1224 |
| 29 | fuel cells | 40 | 3.5K | 272 | 193 |
| 30 | Polymers | 209 | 3.4K | 567 | 845 |
| 31 | Science | 168 | 3.4K | 1695 | 3484 |
| 32 | actuators | 81 | 3.4K | 197 | 197 |
| 32 | transducers | 81 | 3.4K | 197 | 197 |
| 34 | Renewable Energy Sources | 67 | 3.3K | 287 | 467 |
| 35 | Engineering Geology | 102 | 3.3K | 96 | 127 |
| 36 | Carbon | 84 | 3.3K | 86 | 147 |
| 37 | Photonics | 107 | 3.3K | 160 | 309 |
| 38 | Biomass Energy | 63 | 3.2K | 376 | 373 |
| 39 | Biology | 87 | 3.2K | 2499 | 3404 |
| 40 | Soil Mechanics | 76 | 3.0K | 131 | 125 |
| 41 | Green Chemistry | 93 | 2.9K | 146 | 286 |
| 42 | Biotechnology | 129 | 2.9K | 965 | 1570 |
| 43 | Mathematics | 315 | 2.7K | 646 | 850 |
| 44 | pigments | 71 | 2.6K | 34 | 13 |
| 45 | Biomedical Engineering | 158 | 2.5K | 493 | 926 |
| 46 | Industrial Engineering | 107 | 2.5K | 119 | 187 |
| 47 | Environmental Health | 90 | 2.4K | 919 | 1290 |
| 48 | energy conservation | 77 | 2.4K | 158 | 292 |
| 49 | Ecology | 92 | 2.4K | 1329 | 1943 |
| 50 | Zeolites | 90 | 2.4K | 22 | 56 |
| 51 | Sustainable Engineering | 65 | 2.3K | 157 | 222 |
| 52 | environmental pollution | 79 | 2.3K | 812 | 1120 |
| 53 | Luminescence | 70 | 2.1K | 62 | 34 |
| 54 | Structural Engineering | 77 | 2.0K | 236 | 246 |
| 55 | polymerization | 142 | 2.0K | 596 | 955 |
| 56 | Bioengineering | 83 | 2.0K | 763 | 1391 |
| 57 | Biochemistry | 107 | 1.9K | 2293 | 3187 |
| 58 | Energy Conversion | 42 | 1.9K | 246 | 428 |
| 59 | Mechanical Engineering | 131 | 1.8K | 172 | 233 |
| 60 | Mining Engineering | 35 | 1.8K | 80 | 58 |
| 61 | Nanoparticles | 77 | 1.8K | 182 | 338 |
| 62 | Manufacturing Processes | 96 | 1.7K | 233 | 363 |
| 63 | impact | 28 | 1.7K | 46 | 35 |
| 64 | Fracture mechanics | 76 | 1.7K | 144 | 192 |
| 65 | Chemical industry | 109 | 1.7K | 81 | 69 |
| 66 | Technology | 122 | 1.7K | 467 | 824 |
| 67 | Solid State Physics | 110 | 1.6K | 903 | 1128 |
| 68 | Environmental Management | 75 | 1.6K | 319 | 745 |
| 69 | Medicine | 115 | 1.6K | 2305 | 4074 |
| 70 | Systems Engineering | 77 | 1.6K | 173 | 195 |
| 71 | Environmental Engineering | 65 | 1.5K | 702 | 1105 |
| 72 | Environmental monitoring | 62 | 1.5K | 688 | 1166 |
| 73 | environmental protection | 65 | 1.5K | 515 | 867 |
| 74 | Energy Storage | 49 | 1.5K | 162 | 235 |
| 75 | Engineering Mathematics | 189 | 1.5K | 73 | 255 |
| 76 | Solid State Chemistry | 75 | 1.4K | 417 | 481 |
| 77 | natural gas | 40 | 1.4K | 49 | 42 |
| 78 | Research | 113 | 1.4K | 1792 | 3282 |
| 79 | Metallography | 45 | 1.4K | 72 | 50 |
| 80 | Membranes | 30 | 1.4K | 559 | 559 |
| 81 | lasers | 56 | 1.4K | 216 | 171 |
| 82 | Measurement | 56 | 1.2K | 105 | 124 |
| 83 | vibration | 50 | 1.1K | 166 | 225 |
| 84 | Heat Exchangers | 44 | 1.1K | 142 | 243 |
| 85 | Organic Chemistry | 45 | 1.1K | 1023 | 1090 |
| 86 | Statistical physics | 107 | 1.1K | 798 | 1206 |
| 87 | Molecular Biology | 52 | 1.1K | 2852 | 3979 |
| 88 | Metallic Glasses | 38 | 1.0K | 46 | 65 |
| 89 | Engineering | 88 | 1.0K | 616 | 948 |
| 90 | sanitation | 16 | 1.0K | 757 | 810 |
| 91 | Plastics | 46 | 991 | 264 | 299 |
| 92 | Artificial Intelligence | 64 | 977 | 757 | 1134 |
| 92 | Electronics | 56 | 977 | 893 | 917 |
| 94 | Earth Sciences | 105 | 972 | 431 | 1119 |
| 95 | Geophysics | 74 | 954 | 953 | 1496 |
| 96 | Environmental Policy | 40 | 941 | 794 | 1362 |
| 97 | biocatalysis | 2 | 934 | 286 | 158 |
| 97 | Homogeneous catalysis | 2 | 934 | 286 | 158 |
| 97 | Heterogeneous catalysis | 2 | 934 | 286 | 158 |
| 100 | particles | 53 | 901 | 59 | 104 |
| 101 | Tribology | 60 | 895 | 130 | 244 |
| 101 | Structural dynamics | 22 | 895 | 365 | 334 |
| 103 | Earthquake Engineering | 38 | 891 | 320 | 395 |
| 104 | Spectrum analysis | 36 | 888 | 1738 | 1814 |
| 105 | Catalysts | 51 | 855 | 39 | 112 |
| 106 | Electrochemical Analysis | 32 | 853 | 376 | 374 |
| 107 | Automation | 33 | 849 | 492 | 573 |
| 108 | Ocean Engineering | 39 | 835 | 419 | 510 |
| 109 | Geology | 86 | 834 | 677 | 1154 |
| 110 | Nanostructures | 72 | 823 | 183 | 825 |
| 111 | Numerical Analysis | 55 | 792 | 440 | 559 |
| 112 | carbon monoxide | 13 | 776 | 46 | 34 |
| 113 | miniaturization | 44 | 757 | 406 | 931 |
| 114 | Production Engineering | 73 | 744 | 223 | 466 |
| 115 | Iron | 52 | 731 | 43 | 55 |
| 116 | Water | 23 | 727 | 986 | 1315 |
| 117 | Nuclear Physics | 64 | 724 | 1537 | 1967 |
| 118 | Hydrocarbons | 25 | 716 | 22 | 9 |
| 119 | Entropy | 38 | 698 | 81 | 82 |
| 120 | clay | 15 | 697 | 224 | 205 |
| 121 | Porous materials | 43 | 687 | 42 | 74 |
| 122 | Bioorganic chemistry | 17 | 684 | 1486 | 1285 |
| 123 | energy resources | 19 | 677 | 457 | 769 |
| 124 | Environmental Chemistry | 12 | 671 | 1200 | 1112 |
| 125 | Biosensors | 20 | 667 | 414 | 677 |
| 126 | Information Science | 18 | 642 | 1047 | 910 |
| 127 | Solar Energy | 20 | 623 | 548 | 693 |
| 128 | Condensed Matter | 62 | 620 | 1147 | 1625 |
| 129 | Water pollution | 26 | 584 | 1018 | 1488 |
| 130 | Microbiology | 32 | 582 | 2857 | 4193 |
| 131 | Physical Chemistry | 8 | 575 | 1736 | 1104 |
| 132 | Geomorphology | 15 | 574 | 647 | 664 |
| 133 | concrete | 12 | 571 | 511 | 525 |
| 134 | natural disasters | 22 | 562 | 321 | 449 |
| 135 | Nanochemistry | 39 | 560 | 108 | 211 |
| 136 | Molecular structure | 37 | 554 | 617 | 1072 |
| 137 | Granular materials | 28 | 548 | 59 | 95 |
| 138 | Signal Processing | 45 | 544 | 401 | 650 |
| 139 | Organometallic chemistry | 39 | 537 | 381 | 564 |
| 140 | plasticity | 6 | 536 | 231 | 178 |
| 141 | Molecular Spectroscopy | 22 | 526 | 612 | 595 |
| 142 | Environmental Geology | 28 | 513 | 367 | 675 |
| 143 | mass transfer | 19 | 504 | 706 | 782 |
| 144 | hazard mitigation | 17 | 484 | 247 | 292 |
| 145 | Hydrology | 58 | 483 | 496 | 1202 |
| 146 | Petroleum Engineering | 22 | 480 | 232 | 252 |
| 147 | Hydrogeology | 44 | 477 | 66 | 209 |
| 148 | Mineralogy | 39 | 468 | 388 | 640 |
| 148 | Semiconductors | 39 | 468 | 494 | 708 |
| 150 | Detectors | 69 | 467 | 57 | 107 |
| 151 | Civil Engineering | 55 | 465 | 313 | 416 |
| 152 | Biophysics | 37 | 462 | 2290 | 3441 |
| 152 | Tunneling | 12 | 462 | 127 | 155 |
| 152 | underground construction | 12 | 462 | 127 | 155 |
| 155 | Light | 2 | 450 | 1451 | 804 |
| 156 | Surface-Active Agents | 21 | 441 | 231 | 498 |
| 156 | Surface properties | 21 | 441 | 256 | 558 |
| 158 | health planning | 36 | 440 | 447 | 736 |
| 159 | System analysis | 35 | 433 | 648 | 1007 |
| 160 | Geotechnical Engineering | 7 | 426 | 475 | 286 |
| 161 | Calorimetry | 26 | 424 | 221 | 264 |
| 161 | Thermal analysis | 26 | 424 | 221 | 264 |
| 163 | Dynamics | 49 | 415 | 262 | 547 |
| 164 | Bioelectronics | 12 | 409 | 514 | 840 |
| 165 | Microelectronics | 20 | 408 | 809 | 1117 |
| 166 | Image Processing | 40 | 403 | 427 | 1012 |
| 167 | Ceramics | 17 | 400 | 615 | 651 |
| 168 | Nonlinear Dynamics | 15 | 392 | 1256 | 1173 |
| 169 | Astronomy | 36 | 391 | 1241 | 1919 |
| 170 | Fiber Optics | 48 | 388 | 41 | 81 |
| 171 | Electrical Engineering | 42 | 384 | 1078 | 1104 |
| 172 | Ceramic materials | 27 | 382 | 323 | 547 |
| 173 | Recycling | 6 | 378 | 374 | 450 |
| 174 | Combustion | 33 | 377 | 327 | 640 |
| 174 | solar power | 10 | 377 | 399 | 492 |
| 174 | solar cells | 10 | 377 | 466 | 549 |
| 177 | Mathematical Physics | 46 | 371 | 901 | 1371 |
| 178 | Soil Science | 12 | 370 | 1082 | 1113 |
| 179 | Fractals | 20 | 369 | 328 | 445 |
| 180 | Neural circuitry | 21 | 363 | 666 | 1105 |
| 181 | mathematical analysis | 57 | 360 | 637 | 980 |
| 182 | Hazardous waste | 20 | 355 | 189 | 634 |
| 183 | Control Theory | 31 | 353 | 512 | 712 |
| 184 | Developing countries | 4 | 352 | 2563 | 1163 |
| 185 | Asia | 14 | 346 | 1345 | 958 |
| 186 | Differential Equations | 6 | 330 | 797 | 379 |
| 187 | Economic History | 3 | 328 | 4412 | 1485 |
| 188 | Economic Development | 2 | 325 | 2503 | 1111 |
| 189 | enzymes | 4 | 321 | 1572 | 974 |
| 190 | Waste management | 19 | 319 | 466 | 553 |
| 191 | Multimedia Systems | 40 | 318 | 230 | 549 |
| 192 | radioactive waste | 16 | 316 | 186 | 648 |
| 192 | industrial waste | 16 | 316 | 197 | 649 |
| 194 | Cellulose | 7 | 315 | 358 | 299 |
| 195 | Solitons | 15 | 309 | 349 | 461 |
| 195 | Chaos | 15 | 309 | 349 | 461 |
| 197 | Microstructure | 19 | 308 | 186 | 171 |
| 198 | Smart Materials | 19 | 300 | 274 | 442 |
| 199 | Development | 1 | 299 | 1585 | 570 |
| 199 | Economic Assistance | 1 | 299 | 1443 | 516 |
| 199 | world | 1 | 299 | 1436 | 611 |
| 202 | Fluid Mechanics | 49 | 283 | 361 | 936 |
| 203 | Geothermal Energy | 5 | 276 | 182 | 103 |
| 203 | Photochemistry | 11 | 276 | 1046 | 1091 |
| 205 | Materials Engineering | 23 | 275 | 85 | 160 |
| 205 | Greenhouse gases | 3 | 275 | 383 | 230 |
| 207 | Photobiology | 10 | 274 | 767 | 782 |
| 208 | Nanophotonics | 7 | 272 | 179 | 183 |
| 209 | textile fibers | 22 | 269 | 87 | 91 |
| 210 | Water quality management | 23 | 266 | 599 | 975 |
| 211 | Toxicology | 6 | 260 | 4304 | 3769 |
| 211 | Environmental pollutants | 8 | 260 | 1703 | 1724 |
| 213 | pollutants | 7 | 258 | 1482 | 1491 |
| 214 | environmental indicators | 9 | 254 | 619 | 889 |
| 214 | environmental exposure | 8 | 254 | 1290 | 1387 |
| 216 | Energy Harvesting | 5 | 252 | 396 | 514 |
| 217 | Fuzzy systems | 23 | 249 | 410 | 641 |
| 218 | machinery | 15 | 247 | 250 | 340 |
| 219 | Mechatronics | 22 | 246 | 148 | 287 |
| 220 | Structural design | 19 | 244 | 220 | 451 |
| 221 | Mechanics | 26 | 242 | 349 | 606 |
| 222 | Optical Communications | 11 | 241 | 276 | 230 |
| 223 | Environmental Toxicology | 7 | 238 | 1931 | 2152 |
| 224 | Fluid Dynamics | 46 | 237 | 196 | 712 |
| 224 | Physical organic chemistry | 15 | 237 | 673 | 864 |
| 224 | Japan | 10 | 237 | 1176 | 896 |
| 227 | Cement | 5 | 233 | 522 | 615 |
| 228 | Soil dynamics | 7 | 229 | 298 | 275 |
| 229 | Chemical processes | 16 | 227 | 186 | 290 |
| 230 | Lightweight concrete | 2 | 223 | 564 | 464 |
| 231 | Computer Science | 22 | 222 | 699 | 1025 |
| 232 | Quality Control | 7 | 220 | 1330 | 1202 |
| 233 | Industrial Microbiology | 7 | 218 | 1516 | 1761 |
| 234 | software | 8 | 215 | 536 | 713 |
| 235 | brain mapping | 5 | 214 | 619 | 673 |
| 236 | Biomechanics | 15 | 207 | 632 | 1047 |
| 237 | Nonlinear functional analysis | 14 | 206 | 534 | 671 |
| 238 | Combinatorial chemistry | 6 | 201 | 679 | 755 |
| 239 | food technology | 5 | 197 | 2419 | 2156 |
| 240 | Information Theory | 30 | 196 | 274 | 765 |
| 241 | micromechanics | 8 | 194 | 370 | 413 |
| 242 | biopolymers | 10 | 192 | 748 | 943 |
| 243 | Computational Biology | 22 | 191 | 1077 | 2399 |
| 244 | Technological Innovations | 7 | 190 | 685 | 706 |
| 244 | Ultrasonics | 8 | 190 | 661 | 974 |
| 246 | Groundwater | 38 | 189 | 97 | 449 |
| 247 | Chemical kinetics | 24 | 188 | 124 | 247 |
| 248 | energy development | 12 | 185 | 298 | 765 |
| 249 | Algorithms | 3 | 184 | 856 | 363 |
| 249 | Industrial Safety | 8 | 184 | 702 | 741 |
| 251 | biofuels | 3 | 183 | 321 | 375 |
| 252 | Cybernetics | 16 | 180 | 539 | 945 |
| 252 | Optoelectronics | 29 | 180 | 72 | 156 |
| 254 | Computational Intelligence | 21 | 179 | 145 | 400 |
| 254 | Environmental Geochemistry | 14 | 179 | 95 | 249 |
| 254 | food handling | 2 | 179 | 1303 | 809 |
| 254 | Minerals | 14 | 179 | 236 | 481 |
| 258 | Molecules | 12 | 178 | 940 | 1043 |
| 259 | Psychology | 7 | 177 | 4220 | 3979 |
| 259 | Soft Condensed Matter | 10 | 177 | 691 | 877 |
| 259 | Biomass | 6 | 177 | 400 | 691 |
| 262 | Quantum Gravity | 10 | 173 | 1555 | 1662 |
| 262 | Water Purification | 16 | 173 | 413 | 722 |
| 264 | Medical Laboratory Science | 7 | 172 | 1649 | 2000 |
| 265 | Diagnostic Imaging | 18 | 170 | 901 | 1684 |
| 266 | Telecommunication Systems | 23 | 168 | 451 | 1001 |
| 267 | biomedicine | 15 | 167 | 217 | 618 |
| 268 | Sonochemistry | 7 | 165 | 319 | 709 |
| 269 | Adsorption | 9 | 163 | 65 | 108 |
| 270 | Thermodynamics | 20 | 162 | 369 | 608 |
| 270 | optical devices | 9 | 162 | 222 | 268 |
| 272 | Computer Graphics | 12 | 161 | 885 | 1185 |
| 273 | Natural history | 2 | 154 | 5970 | 6206 |
| 274 | Bioinorganic chemistry | 8 | 153 | 1010 | 1201 |
| 275 | Agricultural Chemistry | 4 | 152 | 2461 | 2137 |
| 275 | Remote Sensing | 15 | 152 | 618 | 881 |
| 277 | Sustainable Development | 12 | 150 | 1056 | 2012 |
| 278 | Computer Vision | 8 | 147 | 760 | 1179 |
| 278 | Mineral resources | 7 | 147 | 299 | 535 |
| 280 | Municipal Engineering | 3 | 146 | 420 | 220 |
| 280 | Crystal growth | 9 | 146 | 657 | 887 |
| 282 | Mesoporous materials | 9 | 144 | 30 | 100 |
| 283 | Bioinformatics | 14 | 141 | 1041 | 2045 |
| 283 | Nanotubes | 9 | 141 | 63 | 47 |
| 285 | Combinatorial optimization | 17 | 139 | 84 | 162 |
| 285 | Intelligent Control Systems | 13 | 139 | 401 | 485 |
| 287 | Organometallic compounds | 14 | 133 | 619 | 1074 |
| 287 | Agriculture | 8 | 133 | 1730 | 2126 |
| 289 | biological factors | 7 | 131 | 1488 | 1786 |
| 290 | Behavior | 3 | 129 | 3831 | 3697 |
| 291 | Cerebral cortex | 9 | 128 | 621 | 1099 |
| 292 | violence | 3 | 125 | 1058 | 879 |
| 293 | Astrophysics | 16 | 123 | 2020 | 2858 |
| 294 | computer networks | 31 | 122 | 665 | 2039 |
| 295 | soil conservation | 10 | 120 | 344 | 771 |
| 296 | Drying | 4 | 119 | 357 | 323 |
| 297 | Speech Perception | 4 | 115 | 210 | 228 |
| 297 | auditory perception | 4 | 115 | 283 | 294 |
| 297 | Communication | 4 | 115 | 2108 | 1595 |
| 297 | Oral communication | 4 | 115 | 374 | 320 |
| 297 | Speech | 4 | 115 | 859 | 863 |
| 302 | Medical Physics | 13 | 114 | 939 | 1590 |
| 303 | Quantum theory | 10 | 113 | 630 | 882 |
| 303 | Nonlinear systems | 8 | 113 | 347 | 453 |
| 305 | Plant physiology | 3 | 111 | 2453 | 2517 |
| 306 | Robotics | 12 | 109 | 935 | 1541 |
| 306 | Electromagnetism | 8 | 109 | 510 | 566 |
| 306 | Thermochemistry | 7 | 109 | 353 | 436 |
| 309 | Database Management | 4 | 108 | 804 | 793 |
| 310 | Geochemistry | 12 | 107 | 1262 | 2168 |
| 311 | management | 6 | 105 | 2907 | 3309 |
| 311 | Atomic spectroscopy | 7 | 105 | 912 | 1082 |
| 313 | Computational Chemistry | 6 | 104 | 539 | 762 |
| 313 | Nervous system | 6 | 104 | 2215 | 3153 |
| 315 | Boundary Value Problems | 16 | 102 | 101 | 139 |
| 316 | Agricultural Engineering | 9 | 101 | 238 | 477 |
| 316 | Sustainable agriculture | 7 | 101 | 441 | 749 |
| 318 | Algebra | 7 | 100 | 1225 | 870 |
| 319 | Adaptive control systems | 10 | 99 | 240 | 421 |
| 319 | Nonlinear mechanics | 7 | 99 | 234 | 368 |
| 321 | Social Change | 4 | 98 | 957 | 1392 |
| 322 | Chemical analysis | 5 | 96 | 1037 | 1312 |
| 323 | Psychiatry | 5 | 95 | 4239 | 5081 |
| 323 | Wireless Communication Systems | 27 | 95 | 640 | 1720 |
| 323 | Aggression | 2 | 95 | 648 | 564 |
| 326 | Highway Engineering | 12 | 94 | 159 | 330 |
| 327 | Statistical Mechanics | 22 | 91 | 378 | 835 |
| 327 | Imaging systems | 12 | 91 | 274 | 540 |
| 329 | Bioenergetics | 2 | 87 | 1231 | 1119 |
| 330 | Neurology | 6 | 84 | 4754 | 6362 |
| 330 | Mobile Computing | 29 | 84 | 185 | 928 |
| 330 | Land use | 5 | 84 | 1004 | 1487 |
| 330 | land degradation | 5 | 84 | 371 | 670 |
| 330 | degradation | 5 | 84 | 371 | 670 |
| 335 | Analytical Biochemistry | 10 | 81 | 1072 | 2155 |
| 336 | Glass | 9 | 80 | 758 | 1383 |
| 336 | pottery | 9 | 80 | 719 | 1351 |
| 338 | Fossil fuels | 16 | 79 | 7 | 13 |
| 339 | Nuclear Engineering | 8 | 78 | 899 | 1027 |
| 339 | emergency management | 5 | 78 | 727 | 1035 |
| 339 | Refractory materials | 5 | 78 | 101 | 39 |
| 342 | Emulsions | 10 | 77 | 121 | 268 |
| 343 | Forest Ecology | 3 | 76 | 1225 | 1411 |
| 344 | behavioral medicine | 2 | 75 | 1987 | 2093 |
| 345 | Ophthalmology | 7 | 74 | 1463 | 2240 |
| 345 | soil management | 2 | 74 | 794 | 876 |
| 347 | Information Systems | 8 | 73 | 894 | 1795 |
| 347 | Genetic engineering | 2 | 73 | 3164 | 3078 |
| 347 | Muscle contraction | 7 | 73 | 137 | 119 |
| 350 | Nanoelectronics | 8 | 72 | 578 | 780 |
| 350 | Genomics | 5 | 72 | 3270 | 4603 |
| 350 | Computer-Aided Design | 5 | 72 | 1117 | 1421 |
| 350 | Paleogeography | 6 | 72 | 750 | 1225 |
| 350 | scientific research | 12 | 72 | 14 | 44 |
| 355 | Paleoclimatology | 5 | 70 | 985 | 1411 |
| 355 | Paleoecology | 5 | 70 | 945 | 1325 |
| 357 | Planetary Science | 4 | 68 | 567 | 587 |
| 357 | Pharmaceutical Technology | 2 | 68 | 2165 | 2038 |
| 357 | catalytic activity | 2 | 68 | 889 | 912 |
| 360 | Industrial Design | 4 | 67 | 215 | 295 |
| 360 | Functional Analysis | 8 | 67 | 951 | 1217 |
| 362 | Power Electronics | 14 | 66 | 281 | 755 |
| 362 | soil pollution | 6 | 66 | 329 | 698 |
| 364 | Information Technology | 11 | 65 | 1469 | 2663 |
| 364 | tillage | 1 | 65 | 839 | 795 |
| 366 | Neuropsychiatry | 2 | 64 | 1296 | 1315 |
| 366 | Environmental Law | 1 | 64 | 2189 | 2141 |
| 366 | Quantum electronics | 8 | 64 | 680 | 939 |
| 366 | Combinatorial analysis | 17 | 64 | 465 | 799 |
| 366 | United States | 7 | 64 | 4549 | 6194 |
| 366 | Mountains | 3 | 64 | 455 | 333 |
| 372 | Traffic Engineering | 7 | 63 | 244 | 645 |
| 372 | Machine Learning | 3 | 63 | 448 | 478 |
| 374 | Meteorology | 4 | 62 | 2436 | 3381 |
| 374 | Adhesion | 4 | 62 | 637 | 779 |
| 374 | Synthetic biology | 1 | 62 | 669 | 481 |
| 374 | adhesives | 4 | 62 | 687 | 786 |
| 378 | Human-Computer Interaction | 5 | 61 | 1367 | 1896 |
| 378 | Attention | 5 | 61 | 1728 | 2604 |
| 380 | Landslides | 2 | 60 | 356 | 489 |
| 380 | Semiconductor industry | 5 | 60 | 559 | 689 |
| 382 | Social Sciences | 13 | 59 | 2174 | 3623 |
| 383 | Sociology | 10 | 58 | 1925 | 3772 |
| 383 | Flexible electronics | 1 | 58 | 195 | 206 |
| 383 | Textile industry | 11 | 58 | 235 | 471 |
| 386 | Pharmaceutical Chemistry | 6 | 57 | 3543 | 5200 |
| 386 | Cognitive Science | 8 | 57 | 987 | 2239 |
| 388 | Internet of Things | 7 | 56 | 565 | 900 |
| 388 | air quality management | 3 | 56 | 591 | 904 |
| 388 | Chromosome mapping | 3 | 56 | 2328 | 3198 |
| 388 | Soviet Union | 4 | 56 | 709 | 485 |
| 388 | gene mapping | 3 | 56 | 2560 | 3537 |
| 393 | Marine Geology | 4 | 54 | 579 | 818 |
| 393 | Sedimentary rocks | 5 | 54 | 526 | 872 |
| 393 | Petroleum | 4 | 54 | 298 | 283 |
| 393 | carbonate rocks | 5 | 54 | 93 | 104 |
| 397 | Nuclear Fusion | 4 | 53 | 629 | 718 |
| 397 | Energy Consumption | 6 | 53 | 117 | 329 |
| 397 | internet | 6 | 53 | 1025 | 1565 |
| 397 | fusion reactors | 4 | 53 | 457 | 436 |
| 401 | Geography | 2 | 52 | 3237 | 2981 |
| 401 | Bioremediation | 2 | 52 | 1298 | 1491 |
| 401 | Biodegradation | 2 | 52 | 1108 | 1368 |
| 404 | Ore deposits | 9 | 51 | 298 | 742 |
| 404 | wood | 1 | 51 | 933 | 557 |
| 406 | tomography | 3 | 50 | 456 | 493 |
| 407 | Product life cycle | 1 | 48 | 710 | 601 |
| 407 | green products | 1 | 48 | 616 | 584 |
| 409 | Thin Films | 6 | 47 | 400 | 739 |
| 409 | atmosphere | 3 | 47 | 968 | 1360 |
| 411 | Transportation | 3 | 45 | 1926 | 2252 |
| 412 | Quantum Mechanics | 1 | 44 | 425 | 145 |
| 412 | Food Preservation | 1 | 44 | 1589 | 995 |
| 414 | Neurobiology | 1 | 43 | 3091 | 3050 |
| 414 | Process Control | 2 | 43 | 1219 | 1705 |
| 414 | electric vehicles | 4 | 43 | 227 | 333 |
| 414 | irrigation | 9 | 43 | 217 | 561 |
| 414 | Spine | 2 | 43 | 1015 | 1294 |
| 419 | Petroleum Geology | 2 | 42 | 722 | 836 |
| 419 | soil microbiology | 3 | 42 | 1692 | 2969 |
| 421 | Historic Preservation | 4 | 41 | 86 | 134 |
| 421 | Green Technology | 1 | 41 | 1075 | 714 |
| 421 | Bifurcation Theory | 3 | 41 | 767 | 803 |
| 421 | Urban Transportation | 2 | 41 | 275 | 237 |
| 421 | Computational Complexity | 8 | 41 | 673 | 1317 |
| 426 | Computer Engineering | 3 | 40 | 1018 | 1217 |
| 426 | Horticulture | 5 | 40 | 699 | 1110 |
| 426 | Nondestructive testing | 3 | 40 | 843 | 995 |
| 429 | Ferroelectricity | 10 | 39 | 550 | 926 |
| 429 | human behavior | 2 | 39 | 3504 | 4685 |
| 429 | Medical innovations | 4 | 39 | 1073 | 2731 |
| 429 | Fluorescence | 3 | 39 | 516 | 636 |
| 433 | Ecological Engineering | 2 | 38 | 939 | 1460 |
| 433 | Agricultural Ecology | 4 | 38 | 1205 | 2352 |
| 433 | Integrated Circuits | 14 | 38 | 275 | 650 |
| 433 | Freezing | 5 | 38 | 294 | 483 |
| 437 | Data Mining | 7 | 37 | 1242 | 3075 |
| 437 | Databases | 3 | 37 | 430 | 562 |
| 437 | Neurophysiology | 3 | 37 | 3367 | 4663 |
| 437 | Globalization | 2 | 37 | 814 | 979 |
| 437 | Cancer | 3 | 37 | 4431 | 5949 |
| 442 | Forest Management | 2 | 36 | 1432 | 1793 |
| 442 | bioluminescence | 8 | 36 | 149 | 483 |
| 444 | Computational Fluid Dynamics | 2 | 35 | 978 | 1089 |
| 444 | Telecommunication | 8 | 35 | 1689 | 2881 |
| 444 | Oxidation | 2 | 35 | 250 | 321 |
| 447 | Regeneration | 2 | 33 | 89 | 122 |
| 447 | Shock Waves | 2 | 33 | 285 | 295 |
| 449 | Biological Systems | 1 | 32 | 1691 | 1345 |
| 449 | Wireless Communication | 3 | 32 | 502 | 651 |
| 449 | Planets | 2 | 32 | 2074 | 2757 |
| 449 | Soil ecology | 2 | 32 | 1089 | 1582 |
| 453 | Photography | 34 | 31 | 998 | 1810 |
| 453 | Plate Tectonics | 2 | 31 | 407 | 500 |
| 453 | Radiation | 3 | 31 | 2732 | 3373 |
| 453 | air quality | 3 | 31 | 234 | 558 |
| 453 | data collection | 4 | 31 | 1219 | 2438 |
| 453 | drainage | 6 | 31 | 281 | 557 |
| 459 | Medical Technology | 5 | 30 | 1640 | 3515 |
| 459 | Statistics | 12 | 30 | 1645 | 3438 |
| 459 | Sedimentology | 1 | 30 | 1240 | 1183 |
| 459 | Operations Research | 7 | 30 | 1730 | 3078 |
| 459 | Food additives | 1 | 30 | 2241 | 2389 |
| 459 | Radio wave propagation | 3 | 30 | 974 | 1133 |
| 459 | hydrocolloids | 1 | 30 | 1157 | 1522 |
| 459 | extraterrestrial environment | 2 | 30 | 918 | 1040 |
| 459 | sex crimes | 1 | 30 | 1165 | 1083 |
| 459 | astronomical phenomena | 2 | 30 | 842 | 966 |
| 469 | Humanities | 12 | 29 | 954 | 2264 |
| 469 | infrared radiation | 4 | 29 | 606 | 1026 |
| 469 | Mass Spectrometry | 2 | 29 | 1725 | 2089 |
| 469 | Microwaves | 10 | 29 | 722 | 1286 |
| 473 | Detergents | 16 | 28 | 4 | 54 |
| 474 | Nuclear Energy | 4 | 27 | 1137 | 1523 |
| 474 | Microbial Biotechnology | 1 | 27 | 2090 | 2157 |
| 474 | sustainability | 3 | 27 | 970 | 1878 |
| 474 | Bioprinting | 3 | 27 | 42 | 145 |
| 474 | body temperature | 1 | 27 | 1077 | 1044 |
| 479 | Sensor Networks | 7 | 26 | 106 | 417 |
| 479 | Investment analysis | 2 | 26 | 1164 | 1426 |
| 479 | Electromagnetic fields | 4 | 26 | 290 | 363 |
| 479 | High performance computing | 2 | 26 | 93 | 27 |
| 479 | synthesis | 4 | 26 | 1120 | 1543 |
| 479 | India | 3 | 26 | 2192 | 2097 |
| 485 | Radiology | 2 | 25 | 2418 | 2585 |
| 485 | Public Health | 2 | 25 | 8665 | 9931 |
| 485 | Graph Theory | 11 | 25 | 384 | 892 |
| 485 | Phytochemistry | 2 | 25 | 437 | 757 |
| 485 | Systems Biology | 2 | 25 | 2491 | 3442 |
| 485 | Tissue Engineering | 1 | 25 | 740 | 781 |
| 485 | Regenerative Medicine | 1 | 25 | 361 | 325 |
| 485 | cosmic rays | 2 | 25 | 713 | 832 |
| 485 | Phytoremediation | 2 | 25 | 437 | 757 |
| 485 | environmental remediation | 2 | 25 | 545 | 868 |
| 485 | economic policy | 1 | 25 | 4429 | 3296 |
| 485 | Bioreactors | 2 | 25 | 437 | 757 |
| 485 | Ultrasonic Imaging | 1 | 25 | 1079 | 1086 |
| 485 | Ultrasound | 1 | 25 | 1144 | 1180 |
| 499 | Applied Mathematics | 17 | 24 | 251 | 1008 |
| 499 | Risk Management | 4 | 24 | 689 | 1602 |
| 499 | Geomagnetism | 1 | 24 | 1084 | 1122 |
| 499 | Artificial Organs | 1 | 24 | 1326 | 1203 |
| 499 | Quantum Optics | 6 | 24 | 772 | 1470 |
| 499 | Evolutionary Computation | 3 | 24 | 411 | 906 |
| 499 | Laser Spectroscopy | 6 | 24 | 709 | 1396 |
| 506 | Economics | 7 | 23 | 3492 | 5321 |
| 506 | Aerospace Engineering | 4 | 23 | 386 | 637 |
| 506 | Neurochemistry | 2 | 23 | 3198 | 4346 |
| 506 | Plant Genetics | 2 | 23 | 1000 | 1568 |
| 506 | Fuzzy Logic | 1 | 23 | 297 | 267 |
| 506 | Petrology | 3 | 23 | 1022 | 1481 |
| 506 | Microprocessors | 2 | 23 | 837 | 1024 |
| 506 | Spectroscopy | 2 | 23 | 324 | 236 |
| 506 | Transport | 1 | 23 | 1204 | 1409 |
| 506 | Sea | 1 | 23 | 1077 | 1214 |
| 506 | Fishery resources | 1 | 23 | 1220 | 1321 |
| 506 | Alloys | 6 | 23 | 166 | 403 |
| 506 | Water chemistry | 3 | 23 | 362 | 873 |
| 506 | Fisheries | 1 | 23 | 2874 | 2686 |
| 520 | Environmental Microbiology | 1 | 22 | 2740 | 3379 |
| 520 | Regional Planning | 3 | 22 | 1811 | 2540 |
| 520 | Medical Microbiology | 1 | 22 | 4312 | 5055 |
| 520 | Quantum Chemistry | 5 | 22 | 829 | 1396 |
| 520 | structural stability | 4 | 22 | 444 | 999 |
| 520 | Mobile Commerce | 9 | 22 | 65 | 416 |
| 520 | Microorganisms | 1 | 22 | 2267 | 2863 |
| 520 | city planning | 3 | 22 | 1916 | 2819 |
| 528 | Hydrodynamics | 4 | 21 | 573 | 1234 |
| 528 | color | 2 | 21 | 404 | 551 |
| 528 | electrocatalysis | 2 | 21 | 146 | 321 |
| 531 | Seismology | 4 | 20 | 521 | 929 |
| 531 | Stochastic Processes | 3 | 20 | 1113 | 1578 |
| 531 | Atmospheric Physics | 4 | 20 | 1694 | 2966 |
| 531 | nuclear magnetic resonance | 2 | 20 | 1537 | 1839 |
| 531 | Magnetic Resonance Spectroscopy | 2 | 20 | 1695 | 2056 |
| 531 | Flood control | 5 | 20 | 168 | 676 |
| 531 | Solutions | 4 | 20 | 348 | 712 |
| 531 | Plant diseases | 2 | 20 | 2642 | 3236 |
| 531 | cell physiology | 1 | 20 | 2693 | 3346 |
| 540 | Botany | 3 | 19 | 4410 | 6288 |
| 540 | cryosphere | 1 | 19 | 735 | 876 |
| 542 | Oceanography | 6 | 18 | 1556 | 3250 |
| 542 | Risk assessment | 5 | 18 | 472 | 1451 |
| 542 | isomerism | 1 | 18 | 752 | 809 |
| 542 | Brain | 2 | 18 | 3525 | 4838 |
| 542 | Evolution equations | 1 | 18 | 381 | 276 |
| 542 | biological monitoring | 1 | 18 | 1151 | 1473 |
| 542 | Chirality | 1 | 18 | 752 | 809 |
| 549 | Pharmacology | 4 | 17 | 5809 | 9324 |
| 549 | Ergonomics | 1 | 17 | 1992 | 1943 |
| 549 | Neuropsychology | 2 | 17 | 3195 | 4512 |
| 549 | Intelligent Transportation Systems | 2 | 17 | 1172 | 1612 |
| 549 | Discrete Mathematics | 5 | 17 | 251 | 408 |
| 549 | Cross-Cultural Studies | 1 | 17 | 1439 | 1583 |
| 549 | graph | 5 | 17 | 251 | 408 |
| 549 | cross-cultural comparison | 1 | 17 | 1133 | 1292 |
| 549 | Biomolecules | 1 | 17 | 977 | 1351 |
| 549 | amino acids | 1 | 17 | 1298 | 1627 |
| 559 | Structural optimization | 2 | 16 | 510 | 875 |
| 559 | Computer Architecture | 1 | 16 | 953 | 903 |
| 559 | Optoelectronic devices | 4 | 16 | 893 | 1472 |
| 562 | Project Management | 1 | 15 | 559 | 930 |
| 562 | Ubiquitous computing | 3 | 15 | 269 | 432 |
| 562 | Health Risk Assessment | 4 | 15 | 395 | 1273 |
| 565 | Software Engineering | 6 | 14 | 835 | 1846 |
| 565 | Anatomy | 1 | 14 | 3570 | 3982 |
| 565 | Embryology | 1 | 14 | 2692 | 3350 |
| 565 | Linguistics | 2 | 14 | 2151 | 2195 |
| 565 | Biostatistics | 2 | 14 | 254 | 367 |
| 565 | Health Policy | 1 | 14 | 4796 | 5260 |
| 565 | Developmental Biology | 1 | 14 | 3611 | 4411 |
| 565 | ecological risk assessment | 3 | 14 | 269 | 869 |
| 565 | Electromagnetic waves | 1 | 14 | 540 | 561 |
| 565 | Drug delivery systems | 1 | 14 | 2798 | 3491 |
| 565 | Crystallography | 2 | 14 | 2348 | 2452 |
| 565 | Flood forecasting | 2 | 14 | 172 | 472 |
| 565 | Cell differentiation | 1 | 14 | 2988 | 3869 |
| 565 | Radioisotopes | 1 | 14 | 2354 | 2358 |
| 565 | plant molecular biology | 1 | 14 | 2682 | 3396 |
| 565 | Growth | 1 | 14 | 2099 | 2721 |
| 565 | Heterocyclic compounds | 3 | 14 | 1248 | 1855 |
| 565 | Isotopes | 1 | 14 | 314 | 388 |
| 583 | Cytology | 2 | 13 | 5638 | 7878 |
| 583 | Sustainable Architecture | 2 | 13 | 285 | 416 |
| 583 | Polymer Engineering | 2 | 13 | 156 | 344 |
| 583 | Geosynthetics | 1 | 13 | 330 | 415 |
| 583 | Sports Medicine | 7 | 13 | 1993 | 4334 |
| 583 | Cell Biology | 2 | 13 | 5414 | 7690 |
| 583 | Turbulence | 1 | 13 | 498 | 600 |
| 583 | Sports | 6 | 13 | 1659 | 3389 |
| 583 | Cosmochemistry | 3 | 13 | 1078 | 2123 |
| 583 | food industry | 1 | 13 | 1564 | 1776 |
| 583 | Exercise | 6 | 13 | 1054 | 2619 |
| 594 | Metabolism | 2 | 12 | 3986 | 6082 |
| 594 | Cosmology | 5 | 12 | 1350 | 2056 |
| 594 | Hydraulic Engineering | 3 | 12 | 1302 | 2167 |
| 594 | Environmental Psychology | 1 | 12 | 756 | 1179 |
| 594 | diffusion | 3 | 12 | 410 | 401 |
| 594 | Drug design | 1 | 12 | 3410 | 3960 |
| 594 | Marine Geophysics | 2 | 12 | 381 | 691 |
| 594 | Marine mineral resources | 2 | 12 | 213 | 398 |
| 594 | Methodology | 1 | 12 | 1089 | 1196 |
| 594 | Seabed | 2 | 12 | 213 | 398 |
| 594 | genome | 2 | 12 | 2414 | 3939 |
| 594 | Bones | 2 | 12 | 1355 | 2156 |
| 594 | Plasma devices | 1 | 12 | 643 | 811 |
| 607 | Speech-Language Pathology | 1 | 11 | 606 | 818 |
| 607 | Epidemiology | 1 | 11 | 7222 | 8368 |
| 607 | Nanobiotechnology | 2 | 11 | 626 | 1573 |
| 607 | automatic speech recognition | 1 | 11 | 354 | 537 |
| 607 | supercritical fluids | 1 | 11 | 762 | 1169 |
| 607 | multimedia | 3 | 11 | 270 | 598 |
| 607 | Interactive multimedia | 3 | 11 | 401 | 943 |
| 614 | Particle Physics | 4 | 10 | 870 | 1361 |
| 614 | Technology Assessment | 1 | 10 | 849 | 1482 |
| 614 | Hydraulic machinery | 2 | 10 | 190 | 349 |
| 614 | Environmental risk assessment | 2 | 10 | 643 | 1345 |
| 614 | biomimicry | 1 | 10 | 353 | 556 |
| 619 | Climatology | 2 | 9 | 2474 | 3914 |
| 619 | Systems Analysis | 2 | 9 | 1630 | 2788 |
| 619 | Geographic information systems | 5 | 9 | 957 | 2695 |
| 619 | Electrophysiology | 1 | 9 | 2164 | 2544 |
| 619 | phenomics | 1 | 9 | 114 | 222 |
| 619 | Fertilizers | 1 | 9 | 763 | 1051 |
| 619 | Sun | 1 | 9 | 711 | 856 |
| 619 | rehabilitation | 3 | 9 | 2683 | 5114 |
| 619 | Solar System | 1 | 9 | 1367 | 1671 |
| 628 | Econometrics | 4 | 8 | 1369 | 2558 |
| 628 | Geochemical Modeling | 1 | 8 | 525 | 722 |
| 628 | Online social networks | 1 | 8 | 760 | 1075 |
| 628 | Raman spectroscopy | 1 | 8 | 1635 | 2247 |
| 628 | big data | 4 | 8 | 466 | 1632 |
| 628 | Interfaces | 1 | 8 | 749 | 1004 |
| 628 | phase diagrams | 1 | 8 | 329 | 411 |
| 628 | geological modeling | 1 | 8 | 1174 | 1501 |
| 628 | Africa | 1 | 8 | 3304 | 3534 |
| 628 | econometric models | 1 | 8 | 1204 | 1615 |
| 638 | Education | 2 | 7 | 5646 | 7245 |
| 638 | Geriatrics | 1 | 7 | 5662 | 6431 |
| 638 | Surveying | 2 | 7 | 288 | 472 |
| 638 | Aerosols | 1 | 7 | 1133 | 1475 |
| 638 | Teaching | 2 | 7 | 2571 | 3833 |
| 638 | indoor air pollution | 3 | 7 | 455 | 1452 |
| 638 | Ventilation | 3 | 7 | 629 | 1721 |
| 638 | Sick building syndrome | 3 | 7 | 455 | 1452 |
| 646 | Cloud Computing | 1 | 6 | 578 | 970 |
| 646 | Geometry | 6 | 6 | 1080 | 2047 |
| 646 | Development Economics | 1 | 6 | 1002 | 1438 |
| 646 | Developmental Psychology | 1 | 6 | 1920 | 2621 |
| 646 | Operator theory | 3 | 6 | 488 | 883 |
| 646 | Natural resources | 1 | 6 | 1527 | 2117 |
| 646 | Photogrammetry | 5 | 6 | 726 | 1633 |
| 646 | radiative transfer | 1 | 6 | 1112 | 1441 |
| 646 | Cognitive neuroscience | 2 | 6 | 1301 | 2357 |
| 646 | Earthquake prediction | 3 | 6 | 55 | 164 |
| 646 | Friction | 1 | 6 | 250 | 533 |
| 646 | Strategic planning | 2 | 6 | 1082 | 2017 |
| 646 | Hydraulic structures | 2 | 6 | 133 | 310 |
| 646 | starch | 1 | 6 | 739 | 1118 |
| 646 | Finite Element Method | 1 | 6 | 649 | 947 |
| 646 | human development | 1 | 6 | 1416 | 2095 |
| 646 | deviant behavior | 1 | 6 | 556 | 740 |
| 646 | data protection | 2 | 6 | 908 | 1642 |
| 646 | Cognition | 1 | 6 | 2927 | 3976 |
| 665 | Distance Education | 1 | 5 | 1087 | 1571 |
| 665 | Glaciology | 1 | 5 | 406 | 574 |
| 665 | Architectural Design | 3 | 5 | 506 | 1222 |
| 665 | Educational Technology | 1 | 5 | 3030 | 4051 |
| 665 | Organizational learning | 5 | 5 | 282 | 1760 |
| 665 | sedimentary basins | 1 | 5 | 412 | 670 |
| 665 | Thrombosis | 1 | 5 | 2054 | 2872 |
| 665 | Noise | 2 | 5 | 235 | 546 |
| 665 | Knowledge management | 5 | 5 | 372 | 1987 |
| 665 | Obesity | 1 | 5 | 3766 | 5334 |
| 665 | Sound | 2 | 5 | 1280 | 1924 |
| 665 | East Asia | 3 | 5 | 765 | 1801 |
| 665 | nuclear power | 1 | 5 | 998 | 1116 |
| 665 | telecommunication in education | 1 | 5 | 190 | 267 |
| 665 | glaciers | 1 | 5 | 361 | 529 |
| 665 | crime victims | 1 | 5 | 345 | 624 |
| 665 | Decision making | 1 | 5 | 3102 | 4272 |
| 665 | Fibers | 2 | 5 | 168 | 364 |
| 665 | Navigation | 1 | 5 | 884 | 1156 |
| 665 | mathematical concepts | 2 | 5 | 614 | 1279 |
| 665 | Aquaculture | 1 | 5 | 2514 | 3332 |
| 686 | Archaeology | 1 | 4 | 2456 | 2864 |
| 686 | Physical Geography | 3 | 4 | 673 | 1648 |
| 686 | Logistics | 1 | 4 | 1108 | 1651 |
| 686 | Agronomy | 1 | 4 | 1250 | 1958 |
| 686 | Restoration Ecology | 1 | 4 | 943 | 1465 |
| 686 | Heterocyclic chemistry | 1 | 4 | 1197 | 1600 |
| 686 | Flexible manufacturing systems | 1 | 4 | 863 | 1477 |
| 686 | X-rays | 3 | 4 | 855 | 1913 |
| 686 | natural products | 1 | 4 | 3127 | 4010 |
| 686 | Matroids | 1 | 4 | 435 | 600 |
| 686 | Pakistan | 1 | 4 | 792 | 836 |
| 686 | Scanning electron microscopy | 2 | 4 | 257 | 784 |
| 686 | Perception | 2 | 4 | 2842 | 4966 |
| 686 | Aging | 1 | 4 | 5333 | 6518 |
| 700 | Language Disorders | 1 | 3 | 1573 | 2278 |
| 700 | Social Psychology | 1 | 3 | 3773 | 5225 |
| 700 | Applied Linguistics | 1 | 3 | 1201 | 1494 |
| 700 | Phonetics | 1 | 3 | 615 | 929 |
| 700 | Product Design | 1 | 3 | 1011 | 1462 |
| 700 | Speech Disorders | 1 | 3 | 1820 | 2599 |
| 700 | Data Warehousing | 1 | 3 | 115 | 253 |
| 700 | Earthquakes | 2 | 3 | 588 | 1175 |
| 700 | water supply | 1 | 3 | 1785 | 2697 |
| 700 | Radio | 1 | 3 | 1688 | 2028 |
| 700 | atmospheric models | 1 | 3 | 1190 | 1812 |
| 700 | Informatics | 1 | 3 | 1693 | 2551 |
| 700 | silicon | 1 | 3 | 895 | 1420 |
| 713 | Physiology | 1 | 2 | 6824 | 8952 |
| 713 | Paleontology | 1 | 2 | 2164 | 2891 |
| 713 | Telecommunications | 1 | 2 | 1731 | 2451 |
| 713 | Public Administration | 1 | 2 | 2687 | 3500 |
| 713 | Paleobiology | 1 | 2 | 729 | 1109 |
| 713 | Coastal zone management | 1 | 2 | 1345 | 2270 |
| 713 | Superconductors | 1 | 2 | 1270 | 1686 |
| 713 | Simulation Methods | 1 | 2 | 2083 | 3064 |
| 713 | Political Ethics | 1 | 2 | 227 | 390 |
| 713 | Electron Microscopy | 1 | 2 | 880 | 1359 |
| 713 | Superconductivity | 1 | 2 | 972 | 1358 |
| 713 | Gene expression regulation | 2 | 2 | 1543 | 3084 |
| 713 | Geodynamics | 2 | 2 | 1131 | 2041 |
| 713 | Genetic regulation | 2 | 2 | 1746 | 3340 |
| 713 | Video Games | 1 | 2 | 223 | 473 |
| 713 | protein | 2 | 2 | 1809 | 3393 |
| 713 | Marine resources | 1 | 2 | 1382 | 2288 |
| 713 | movement | 1 | 2 | 705 | 1181 |
| 713 | toxicity testing | 1 | 2 | 1556 | 2552 |
| 713 | probabilities | 1 | 2 | 2175 | 2706 |
| 713 | Cell metabolism | 1 | 2 | 1439 | 2362 |
| 713 | civil service | 1 | 2 | 749 | 1121 |
| 713 | educational innovations | 1 | 2 | 1063 | 1667 |
| 713 | proteins | 2 | 2 | 3052 | 5336 |
| 737 | Nutrition | 1 | 1 | 7573 | 10110 |
| 737 | Occupational Therapy | 1 | 1 | 2156 | 3205 |
| 737 | Systems Theory | 1 | 1 | 1471 | 2446 |
| 737 | Molecular Pharmacology | 1 | 1 | 1524 | 2437 |
| 737 | Occupational Health | 1 | 1 | 2365 | 3658 |
| 737 | Cartography | 2 | 1 | 825 | 1641 |
| 737 | Cytogenetics | 1 | 1 | 2927 | 4376 |
| 737 | Clinical Chemistry | 1 | 1 | 5073 | 6796 |
| 737 | Computational Linguistics | 1 | 1 | 1311 | 2082 |
| 737 | Nuclear Chemistry | 1 | 1 | 2099 | 3012 |
| 737 | Radiochemistry | 1 | 1 | 2026 | 2894 |
| 737 | industrial hygiene | 1 | 1 | 2487 | 3720 |
| 737 | Geodesy | 1 | 1 | 1578 | 2490 |
| 737 | Expert Systems | 1 | 1 | 563 | 1227 |
| 737 | Water Conservation | 2 | 1 | 133 | 553 |
| 737 | E-Learning | 1 | 1 | 103 | 310 |
| 737 | Genetic algorithms | 2 | 1 | 291 | 799 |
| 737 | locomotion | 1 | 1 | 1292 | 2002 |
| 737 | posture | 1 | 1 | 1292 | 2002 |
| 737 | Cardiovascular system | 1 | 1 | 2814 | 4082 |
| 737 | Noise control | 1 | 1 | 680 | 541 |
| 737 | Heritage Tourism | 1 | 1 | 299 | 712 |
| 737 | cultural tourism | 1 | 1 | 288 | 710 |
| 737 | Food | 2 | 1 | 4411 | 7672 |
| 737 | medical education | 1 | 1 | 3884 | 5571 |
| 737 | Web-based instruction | 1 | 1 | 134 | 413 |
| 737 | Microscopy | 1 | 1 | 3277 | 4532 |
| 737 | World Wide Web | 1 | 1 | 1019 | 1799 |
| 737 | gait | 1 | 1 | 1292 | 2002 |
| 737 | Entomology | 1 | 1 | 4008 | 5341 |
| 737 | applications | 1 | 1 | 147 | 289 |
| 737 | Leisure | 1 | 1 | 670 | 1152 |
| 737 | walking | 1 | 1 | 1292 | 2002 |
| 770 | Orthopedics | 1 | 0 | 2899 | 4255 |
| 770 | Signal Transduction | 1 | 0 | 2541 | 3888 |
| 770 | Number Theory | 2 | 0 | 1197 | 2198 |
| 770 | Ecohydrology | 1 | 0 | 846 | 1514 |
| 770 | Powder Metallurgy | 1 | 0 | 760 | 1272 |
| 770 | Molecular evolution | 1 | 0 | 2887 | 4529 |
| 770 | gene therapy | 1 | 0 | 2239 | 3532 |
| 770 | global environmental change | 1 | 0 | 1719 | 2924 |
| 770 | clay minerals | 1 | 0 | 603 | 1102 |
| 770 | foods | 1 | 0 | 673 | 1405 |
| 770 | Building | 1 | 0 | 1429 | 2392 |
| 770 | Genetic therapy | 1 | 0 | 2361 | 3613 |
| 770 | cell interaction | 1 | 0 | 2226 | 3418 |
| 770 | Mental illness | 1 | 0 | 3812 | 5732 |
| 770 | Europe | 1 | 0 | 6313 | 8736 |
| 770 | environmental issues | 1 | 0 | 969 | 1903 |
| 770 | rivers | 1 | 0 | 662 | 1279 |
| 770 | sports injuries | 1 | 0 | 1189 | 2018 |
| 770 | Aquatic ecology | 1 | 0 | 1853 | 2840 |