| grain boundary | 150 | 11 | 14.9 | 0.011845 | 2004.02908,2004.06192,etc |
| Fokker-Planck equation | 115 | 16 | 7.6 | 0.004684 | 2004.02683,2004.02791,etc |
| magnetic field line | 59 | 20 | 2.789 | 0.004591 | 2004.01597,2004.03243,etc |
| surface tension | 157 | 43 | 3.643 | 0.004353 | 2004.01020,2004.01730,etc |
| edge state | 102 | 13 | 8.417 | 0.004246 | 2004.00887,2004.01051,etc |
| neural network model | 44 | 11 | 3.5 | 0.003854 | 2004.00232,2004.00361,etc |
| network science | 48 | 18 | 2.529 | 0.003763 | 2004.01467,2004.06628,etc |
| inertial range | 128 | 17 | 7.688 | 0.003721 | 2004.00752,2004.02726,etc |
| small particle | 29 | 14 | 2.154 | 0.003352 | 2004.04056,2004.04413,etc |
| basic reproduction number | 72 | 19 | 3.889 | 0.003194 | 2004.00044,2004.04602,etc |
| exceptional point | 54 | 14 | 4.077 | 0.003194 | 2004.00912,2004.02130,etc |
| water molecule | 155 | 31 | 5.033 | 0.003111 | 2004.00357,2004.01558,etc |
| porous medium | 95 | 16 | 6.267 | 0.00299 | 2004.01523,2004.01730,etc |
| barrier height | 62 | 12 | 5.182 | 0.002954 | 2004.10962,2004.12256,etc |
| output power | 62 | 13 | 5.0 | 0.002866 | 2004.03068,2004.03711,etc |
| first Brillouin zone | 39 | 12 | 3.182 | 0.002734 | 2004.02149,2004.05486,etc |
| infected population | 57 | 20 | 2.737 | 0.002729 | 2004.00493,2004.01487,etc |
| band gap | 100 | 25 | 4.125 | 0.002688 | 2004.00081,2004.00185,etc |
| infected case | 35 | 13 | 2.583 | 0.00267 | 2004.00044,2004.00553,etc |
| energy barrier | 63 | 21 | 3.1 | 0.002641 | 2004.01148,2004.01276,etc |
| thermal expansion coefficient | 43 | 13 | 3.5 | 0.002585 | 2004.06010,2004.06804,etc |
| proton beam | 46 | 12 | 4.091 | 0.002569 | 2004.01443,2004.01672,etc |
| quantum computer | 61 | 13 | 4.917 | 0.002527 | 2004.04205,2004.07206,etc |
| posterior distribution | 66 | 15 | 3.714 | 0.002457 | 2004.00227,2004.01219,etc |
| photon energy | 114 | 36 | 3.229 | 0.002397 | 2004.00185,2004.00212,etc |
| South Korea | 46 | 13 | 3.083 | 0.002371 | 2004.01481,2004.05992,etc |
| degree distribution | 127 | 25 | 5.208 | 0.002363 | 2004.00825,2004.01994,etc |
| infection rate | 79 | 26 | 2.36 | 0.002348 | 2004.00493,2004.00777,etc |
| regularization parameter | 44 | 12 | 3.909 | 0.002336 | 2004.00675,2004.01155,etc |
| electric field | 638 | 171 | 3.741 | 0.00232 | 2004.00040,2004.00185,etc |
| liquid film | 79 | 11 | 7.8 | 0.002314 | 2004.07660,2004.09200,etc |
| contact line | 92 | 12 | 8.273 | 0.002311 | 2004.01730,2004.03191,etc |
| beam energy | 36 | 11 | 3.5 | 0.002286 | 2004.01682,2004.04539,etc |
| particle distribution | 42 | 15 | 2.429 | 0.002282 | 2004.02431,2004.03469,etc |
| energy surface | 43 | 13 | 3.5 | 0.002277 | 2004.00232,2004.00357,etc |
| turbulent transport | 66 | 13 | 5.417 | 0.002266 | 2004.02221,2004.03739,etc |
| grid point | 154 | 52 | 3.0 | 0.002235 | 2004.00675,2004.00887,etc |
| gamma ray | 36 | 15 | 2.5 | 0.002215 | 2004.01443,2004.02024,etc |
| volume fraction | 67 | 19 | 3.611 | 0.002203 | 2004.00120,2004.00752,etc |
| optical tweezers | 109 | 13 | 9.0 | 0.002153 | 2004.02384,2004.04064,etc |
| force field | 71 | 15 | 4.929 | 0.002146 | 2004.00232,2004.00357,etc |
| scale-free network | 54 | 19 | 2.944 | 0.002118 | 2004.00777,2004.01480,etc |
| bond length | 60 | 11 | 5.9 | 0.002112 | 2004.00357,2004.01058,etc |
| neural network | 358 | 80 | 4.329 | 0.002099 | 2004.00178,2004.00232,etc |
| temporal correlation | 41 | 17 | 2.5 | 0.002094 | 2004.02818,2004.03319,etc |
| oblique incidence | 33 | 12 | 2.909 | 0.002088 | 2004.00882,2004.00953,etc |
| cutoff energy | 33 | 11 | 3.2 | 0.002074 | 2004.00468,2004.00953,etc |
| social medium | 57 | 15 | 4.0 | 0.002073 | 2004.04125,2004.04265,etc |
| laser power | 75 | 25 | 3.083 | 0.002029 | 2004.00712,2004.01552,etc |
| basis set | 60 | 18 | 3.471 | 0.002022 | 2004.01729,2004.02455,etc |
| New York City | 44 | 11 | 4.3 | 0.001985 | 2004.04156,2004.10929,etc |
| first moment | 32 | 13 | 2.583 | 0.001984 | 2004.01994,2004.03835,etc |
| triplet state | 77 | 18 | 4.235 | 0.001979 | 2004.00103,2004.01005,etc |
| free surface | 83 | 21 | 4.05 | 0.001976 | 2004.01148,2004.01699,etc |
| electron-hole pair | 48 | 13 | 3.917 | 0.001958 | 2004.00081,2004.00851,etc |
| topological charge | 75 | 15 | 5.214 | 0.001958 | 2004.01533,2004.01943,etc |
| laser pulse | 134 | 36 | 3.8 | 0.001943 | 2004.00380,2004.00953,etc |
| turbulent state | 47 | 13 | 3.833 | 0.001913 | 2004.00887,2004.01051,etc |
| non-Hermitian system | 68 | 12 | 5.818 | 0.001897 | 2004.00912,2004.03000,etc |
| initial datum | 56 | 17 | 3.062 | 0.001877 | 2004.00044,2004.00896,etc |
| contact network | 37 | 11 | 2.2 | 0.001868 | 2004.03349,2004.04602,etc |
| unit cell | 219 | 52 | 4.255 | 0.00186 | 2004.00185,2004.00468,etc |
| velocity fluctuation | 42 | 20 | 2.158 | 0.001815 | 2004.00752,2004.01565,etc |
| gas phase | 94 | 31 | 3.0 | 0.001807 | 2004.00357,2004.00564,etc |
| thin film | 127 | 41 | 3.15 | 0.001802 | 2004.00185,2004.00304,etc |
| nabla cdot | 60 | 16 | 3.867 | 0.001798 | 2004.00887,2004.01051,etc |
| liquid water | 57 | 11 | 5.5 | 0.001779 | 2004.00357,2004.04888,etc |
| power law | 187 | 71 | 2.629 | 0.001777 | 2004.00752,2004.01994,etc |
| laser system | 41 | 14 | 3.0 | 0.001761 | 2004.01558,2004.01814,etc |
| pressure field | 71 | 25 | 2.792 | 0.001757 | 2004.00887,2004.01482,etc |
| charge carrier | 47 | 14 | 3.538 | 0.001745 | 2004.00851,2004.01458,etc |
| charge state | 57 | 13 | 4.333 | 0.001743 | 2004.00953,2004.05246,etc |
| water droplet | 22 | 11 | 2.1 | 0.00174 | 2004.02833,2004.03191,etc |
| eddy viscosity | 43 | 12 | 3.818 | 0.001714 | 2004.01565,2004.02221,etc |
| temperature field | 61 | 20 | 3.158 | 0.001698 | 2004.03191,2004.06804,etc |
| charge transfer | 46 | 17 | 2.75 | 0.001696 | 2004.00232,2004.00357,etc |
| United States | 103 | 39 | 2.553 | 0.001694 | 2004.00044,2004.00772,etc |
| critical threshold | 44 | 14 | 3.231 | 0.001693 | 2004.00825,2004.02648,etc |
| power supply | 26 | 13 | 2.083 | 0.001682 | 2004.00913,2004.03711,etc |
| infected individual | 145 | 38 | 3.865 | 0.001671 | 2004.00044,2004.00493,etc |
| periodic domain | 28 | 12 | 2.455 | 0.00167 | 2004.00752,2004.03003,etc |
| optical field | 46 | 21 | 2.1 | 0.001656 | 2004.00103,2004.00380,etc |
| state space | 64 | 17 | 3.875 | 0.001652 | 2004.00624,2004.00887,etc |
| Newtonian fluid | 29 | 12 | 2.545 | 0.001644 | 2004.00127,2004.04109,etc |
| temporal fluctuation | 44 | 11 | 3.2 | 0.001625 | 2004.00923,2004.06088,etc |
| correlation energy | 39 | 11 | 3.8 | 0.00162 | 2004.01729,2004.09324,etc |
| laser cooling | 45 | 12 | 4.0 | 0.001617 | 2004.02848,2004.03897,etc |
| film thickness | 82 | 22 | 3.857 | 0.001616 | 2004.00736,2004.01047,etc |
| intermediate regime | 32 | 14 | 2.385 | 0.001606 | 2004.02950,2004.06019,etc |
| Ising model | 53 | 18 | 2.588 | 0.001595 | 2004.01994,2004.02208,etc |
| computer science | 42 | 12 | 3.727 | 0.00158 | 2004.00560,2004.03757,etc |
| energy resolution | 69 | 26 | 2.72 | 0.001575 | 2004.00335,2004.00370,etc |
| Rabi frequency | 74 | 24 | 3.13 | 0.001573 | 2004.00040,2004.00103,etc |
| Langevin equation | 55 | 15 | 3.857 | 0.001568 | 2004.01276,2004.01368,etc |
| matrix element | 130 | 53 | 2.442 | 0.001564 | 2004.00040,2004.00103,etc |
| survival probability | 60 | 13 | 4.5 | 0.001563 | 2004.04406,2004.04510,etc |
| grain size | 38 | 11 | 3.3 | 0.001555 | 2004.00736,2004.02908,etc |
| quantum correlation | 27 | 12 | 2.364 | 0.001549 | 2004.00178,2004.04097,etc |
| turbulent channel flow | 47 | 11 | 4.3 | 0.00154 | 2004.01051,2004.01565,etc |
| mortality rate | 43 | 17 | 2.25 | 0.001526 | 2004.00493,2004.07947,etc |
|