| current sheet | 187 | 15 | 13.286 | 0.006072 | 2001.02174,2001.04563,etc |
| contact line | 65 | 11 | 6.3 | 0.005639 | 2001.00603,2001.00966,etc |
| black hole | 73 | 17 | 4.5 | 0.005238 | 2001.00101,2001.00957,etc |
| dipole moment | 123 | 35 | 3.588 | 0.004092 | 2001.00416,2001.01120,etc |
| focal plane | 66 | 20 | 3.053 | 0.003877 | 2001.00237,2001.00246,etc |
| solar wind | 205 | 24 | 8.87 | 0.003787 | 2001.01648,2001.02170,etc |
| diffraction pattern | 50 | 13 | 4.083 | 0.00368 | 2001.02049,2001.04943,etc |
| degree distribution | 112 | 18 | 6.529 | 0.003622 | 2001.02596,2001.02677,etc |
| cavity mode | 74 | 18 | 4.294 | 0.003614 | 2001.01750,2001.04596,etc |
| Green' function | 106 | 25 | 4.375 | 0.003482 | 2001.02096,2001.03162,etc |
| Rydberg state | 106 | 18 | 6.118 | 0.003426 | 2001.00416,2001.04224,etc |
| shock wave | 101 | 15 | 7.0 | 0.003411 | 2001.01570,2001.03145,etc |
| limit cycle | 39 | 12 | 3.455 | 0.003395 | 2001.00957,2001.03446,etc |
| posterior distribution | 48 | 16 | 2.8 | 0.003394 | 2001.01335,2001.01803,etc |
| conversion efficiency | 66 | 12 | 5.727 | 0.003373 | 2001.01709,2001.02049,etc |
| phase separation | 129 | 17 | 7.938 | 0.003282 | 2001.01677,2001.05646,etc |
| orbital angular momentum | 40 | 17 | 2.312 | 0.003256 | 2001.03193,2001.03456,etc |
| neural network | 249 | 56 | 4.509 | 0.003247 | 2001.00111,2001.00972,etc |
| network science | 52 | 16 | 3.4 | 0.003173 | 2001.01059,2001.02596,etc |
| two-level atom | 39 | 12 | 3.455 | 0.003146 | 2001.01901,2001.03193,etc |
| water molecule | 86 | 13 | 6.5 | 0.003015 | 2001.00107,2001.02136,etc |
| optical lattice | 74 | 17 | 4.562 | 0.003015 | 2001.02821,2001.04599,etc |
| magnetic field | 1025 | 177 | 5.79 | 0.002922 | 2001.00371,2001.00531,etc |
| critical point | 133 | 30 | 4.552 | 0.00281 | 2001.02049,2001.02821,etc |
| vertical velocity | 36 | 17 | 2.188 | 0.002721 | 2001.01576,2001.01609,etc |
| relative velocity | 55 | 14 | 4.154 | 0.002671 | 2001.02427,2001.02724,etc |
| volume fraction | 63 | 18 | 3.118 | 0.002597 | 2001.00867,2001.01601,etc |
| single photon | 89 | 25 | 3.625 | 0.002572 | 2001.01901,2001.02655,etc |
| initial state | 194 | 73 | 2.667 | 0.002534 | 2001.00535,2001.01120,etc |
| magnetic trap | 40 | 11 | 3.4 | 0.002525 | 2001.02317,2001.04538,etc |
| electric field | 670 | 158 | 4.223 | 0.002521 | 2001.00237,2001.00531,etc |
| boundary layer | 192 | 34 | 5.788 | 0.002521 | 2001.00848,2001.01020,etc |
| Ising model | 42 | 12 | 3.636 | 0.002517 | 2001.00247,2001.01059,etc |
| band gap | 180 | 41 | 4.425 | 0.002489 | 2001.00824,2001.00839,etc |
| oxygen atom | 34 | 14 | 2.462 | 0.002481 | 2001.00247,2001.01548,etc |
| nonlinear regime | 33 | 11 | 3.2 | 0.002456 | 2001.02422,2001.02445,etc |
| binding energy | 103 | 23 | 4.545 | 0.002452 | 2001.00646,2001.01548,etc |
| absorption coefficient | 38 | 16 | 2.467 | 0.002413 | 2001.02439,2001.03559,etc |
| canonical ensemble | 36 | 11 | 3.5 | 0.002392 | 2001.01719,2001.06542,etc |
| spin-orbit interaction | 30 | 13 | 2.083 | 0.002388 | 2001.01907,2001.04848,etc |
| density fluctuation | 65 | 14 | 4.923 | 0.002372 | 2001.02170,2001.02494,etc |
| decay time | 42 | 12 | 2.455 | 0.002356 | 2001.02655,2001.04455,etc |
| Hamiltonian system | 62 | 11 | 4.4 | 0.002295 | 2001.00111,2001.00995,etc |
| thermal expansion | 32 | 13 | 2.167 | 0.002252 | 2001.01609,2001.03073,etc |
| wave equation | 76 | 23 | 2.591 | 0.00223 | 2001.00909,2001.01352,etc |
| radiation field | 44 | 18 | 2.471 | 0.002202 | 2001.00531,2001.00957,etc |
| Rydberg atom | 75 | 13 | 5.75 | 0.002201 | 2001.02821,2001.04455,etc |
| dipole approximation | 33 | 11 | 3.1 | 0.002196 | 2001.00646,2001.00965,etc |
| phase noise | 38 | 11 | 3.7 | 0.002193 | 2001.04455,2001.04871,etc |
| horizontal plane | 27 | 11 | 2.6 | 0.002165 | 2001.01609,2001.02825,etc |
| acoustic wave | 32 | 13 | 2.583 | 0.002152 | 2001.00824,2001.01131,etc |
| gamma ray | 60 | 13 | 4.833 | 0.00214 | 2001.00957,2001.01470,etc |
| longitudinal component | 27 | 13 | 2.167 | 0.00213 | 2001.01709,2001.02210,etc |
| excitation energy | 80 | 26 | 2.44 | 0.002101 | 2001.00344,2001.00416,etc |
| electric dipole moment | 39 | 12 | 3.364 | 0.002062 | 2001.02998,2001.06149,etc |
| collective effect | 51 | 12 | 4.545 | 0.002047 | 2001.00957,2001.01750,etc |
| surface roughness | 52 | 19 | 2.833 | 0.002044 | 2001.00433,2001.00446,etc |
| unit cell | 201 | 47 | 4.326 | 0.002018 | 2001.00371,2001.00824,etc |
| optical field | 45 | 20 | 2.316 | 0.00201 | 2001.01709,2001.01991,etc |
| optical spectrum | 31 | 11 | 3.0 | 0.002009 | 2001.00793,2001.02439,etc |
| diffusion equation | 42 | 15 | 2.786 | 0.002001 | 2001.00527,2001.00848,etc |
| chemical reaction | 69 | 27 | 2.5 | 0.002 | 2001.00848,2001.00966,etc |
| energy density | 74 | 31 | 2.367 | 0.001998 | 2001.00965,2001.01120,etc |
| quantum dot | 62 | 22 | 2.81 | 0.001994 | 2001.02136,2001.03446,etc |
| quantum computer | 67 | 13 | 5.5 | 0.001987 | 2001.00646,2001.03406,etc |
| pressure gradient | 92 | 25 | 3.792 | 0.001985 | 2001.01521,2001.01648,etc |
| internal state | 32 | 11 | 3.0 | 0.001967 | 2001.05579,2001.06332,etc |
| bias voltage | 79 | 20 | 3.842 | 0.001963 | 2001.01209,2001.01341,etc |
| laser pulse | 140 | 40 | 3.564 | 0.001956 | 2001.00422,2001.00646,etc |
| transition probability | 47 | 18 | 2.588 | 0.001956 | 2001.01479,2001.02464,etc |
| barrier height | 36 | 11 | 3.4 | 0.001956 | 2001.02989,2001.03300,etc |
| electron beam | 95 | 28 | 3.481 | 0.001925 | 2001.00957,2001.02554,etc |
| Fermi energy | 29 | 11 | 2.7 | 0.001925 | 2001.00957,2001.05813,etc |
| probe beam | 46 | 12 | 2.818 | 0.001901 | 2001.05038,2001.05521,etc |
| photonic crystal | 80 | 23 | 3.409 | 0.001888 | 2001.00371,2001.00824,etc |
| reference frame | 53 | 24 | 2.261 | 0.001885 | 2001.00995,2001.02422,etc |
| growth rate | 127 | 32 | 4.065 | 0.001877 | 2001.00823,2001.00965,etc |
| delay time | 55 | 15 | 3.786 | 0.001872 | 2001.00422,2001.00848,etc |
| specific heat | 58 | 13 | 4.667 | 0.001868 | 2001.00379,2001.01335,etc |
| energy spectrum | 173 | 52 | 3.353 | 0.001856 | 2001.00247,2001.00646,etc |
| liquid helium | 53 | 15 | 3.714 | 0.001853 | 2001.01616,2001.03585,etc |
| plasma density | 78 | 24 | 3.217 | 0.001847 | 2001.00535,2001.00957,etc |
| covariance matrix | 83 | 21 | 4.1 | 0.001843 | 2001.00070,2001.02576,etc |
| quantum state | 95 | 40 | 2.41 | 0.001842 | 2001.00527,2001.00909,etc |
| current density | 152 | 38 | 3.973 | 0.001829 | 2001.01831,2001.02023,etc |
| probability distribution | 158 | 71 | 2.214 | 0.001827 | 2001.00111,2001.00909,etc |
| entangled state | 39 | 12 | 3.0 | 0.001827 | 2001.01120,2001.10009,etc |
| background event | 35 | 12 | 3.091 | 0.001796 | 2001.01470,2001.01476,etc |
| saddle point | 53 | 14 | 3.769 | 0.001793 | 2001.01971,2001.03964,etc |
| incident angle | 73 | 22 | 3.333 | 0.001777 | 2001.00371,2001.01352,etc |
| light beam | 28 | 14 | 2.077 | 0.001772 | 2001.00333,2001.03193,etc |
| central frequency | 40 | 17 | 2.438 | 0.001756 | 2001.04658,2001.05561,etc |
| classical physics | 44 | 12 | 3.909 | 0.001751 | 2001.00101,2001.00909,etc |
| Reynolds number | 145 | 40 | 3.538 | 0.00175 | 2001.00848,2001.01020,etc |
| integral equation | 48 | 19 | 2.556 | 0.00175 | 2001.01576,2001.02904,etc |
| Prandtl number | 32 | 12 | 2.818 | 0.001748 | 2001.01609,2001.02255,etc |
| phase change | 44 | 18 | 2.529 | 0.001736 | 2001.00603,2001.00848,etc |
| refractive index | 184 | 74 | 2.507 | 0.001734 | 2001.00070,2001.00848,etc |
| initial datum | 48 | 13 | 3.917 | 0.001733 | 2001.01570,2001.02032,etc |
| phase space | 281 | 68 | 4.179 | 0.001724 | 2001.00111,2001.00527,etc |
|