| effective mass | 66 | 13 | 5.417 | 0.006471 | 1908.07348,1908.02855,etc |
| porous medium | 129 | 12 | 9.455 | 0.006423 | 1908.09818,1908.10601,etc |
| thermal conductivity | 132 | 20 | 5.632 | 0.005282 | 1908.02387,1908.02156,etc |
| angular velocity | 95 | 19 | 5.222 | 0.005061 | 1908.04713,1908.10658,etc |
| electrical conductivity | 78 | 14 | 5.923 | 0.004544 | 1908.04119,1908.04215,etc |
| solar wind | 259 | 32 | 8.161 | 0.004232 | 1908.00815,1908.00880,etc |
| static magnetic field | 30 | 13 | 2.417 | 0.004196 | 1908.09904,1908.04713,etc |
| laser light | 48 | 16 | 3.133 | 0.004162 | 1908.11442,1908.00725,etc |
| band structure | 83 | 21 | 4.1 | 0.004049 | 1908.05379,1908.05208,etc |
| black hole | 36 | 11 | 3.5 | 0.003809 | 1908.09632,1908.00802,etc |
| acoustic wave | 74 | 13 | 6.083 | 0.003801 | 1908.03634,1908.08278,etc |
| image plane | 82 | 13 | 6.75 | 0.003737 | 1908.01804,1908.09581,etc |
| neural network | 221 | 43 | 5.238 | 0.003696 | 1908.02067,1908.09908,etc |
| shock wave | 124 | 12 | 11.182 | 0.00358 | 1908.00769,1908.09155,etc |
| rotation rate | 79 | 14 | 5.846 | 0.003545 | 1908.06521,1908.05172,etc |
| laminar flow | 49 | 18 | 2.824 | 0.003507 | 1908.00250,1908.05462,etc |
| wave packet | 91 | 15 | 6.143 | 0.003505 | 1908.00880,1908.06474,etc |
| solar cell | 65 | 12 | 5.818 | 0.003438 | 1908.07042,1908.02605,etc |
| network science | 45 | 16 | 2.933 | 0.00314 | 1908.08991,1908.03811,etc |
| water molecule | 78 | 16 | 5.0 | 0.003114 | 1908.01719,1908.04668,etc |
| energy level | 119 | 35 | 3.471 | 0.003101 | 1908.11442,1908.10512,etc |
| velocity gradient | 53 | 19 | 2.833 | 0.002915 | 1908.01638,1908.09487,etc |
| single atom | 39 | 13 | 3.167 | 0.002878 | 1908.11442,1908.03908,etc |
| + right | 73 | 11 | 7.2 | 0.002868 | 1908.04074,1908.04256,etc |
| magnetic field | 1006 | 172 | 5.877 | 0.00285 | 1908.09632,1908.02855,etc |
| spectral density | 49 | 16 | 3.133 | 0.002827 | 1908.06043,1908.01049,etc |
| measurement point | 26 | 11 | 2.5 | 0.002668 | 1908.05463,1908.11644,etc |
| time resolution | 57 | 21 | 2.8 | 0.002639 | 1908.02546,1908.01804,etc |
| density profile | 53 | 17 | 2.812 | 0.002631 | 1908.03634,1908.00250,etc |
| volume fraction | 105 | 22 | 4.952 | 0.002629 | 1908.00250,1908.04529,etc |
| social network | 61 | 23 | 2.682 | 0.002579 | 1908.08429,1908.11583,etc |
| circular polarization | 50 | 15 | 3.357 | 0.002497 | 1908.07562,1908.09786,etc |
| Rydberg state | 62 | 16 | 3.733 | 0.002471 | 1908.11442,1908.08343,etc |
| optical mode | 40 | 11 | 3.8 | 0.002468 | 1908.03908,1908.00871,etc |
| degree distribution | 137 | 29 | 4.071 | 0.002458 | 1908.08429,1908.03875,etc |
| multilayer network | 69 | 14 | 5.231 | 0.002418 | 1908.00920,1908.03875,etc |
| drag force | 27 | 12 | 2.364 | 0.002386 | 1908.02224,1908.10658,etc |
| alpha particle | 48 | 12 | 4.182 | 0.002353 | 1908.00815,1908.02494,etc |
| flow rate | 114 | 25 | 4.625 | 0.00235 | 1908.03540,1908.00250,etc |
| energy resolution | 85 | 24 | 3.348 | 0.002299 | 1908.09136,1908.08117,etc |
| initial phase | 45 | 20 | 2.316 | 0.002292 | 1908.05462,1908.02387,etc |
| electron beam | 109 | 21 | 5.3 | 0.002276 | 1908.08278,1908.06467,etc |
| community detection | 47 | 13 | 3.667 | 0.002266 | 1908.03875,1908.03811,etc |
| electronic state | 73 | 21 | 3.55 | 0.002237 | 1908.00182,1908.07293,etc |
| grid cell | 55 | 15 | 3.786 | 0.002215 | 1908.03634,1908.04529,etc |
| United States | 45 | 14 | 3.308 | 0.002207 | 1908.08991,1908.00920,etc |
| Green' function | 83 | 20 | 4.316 | 0.00217 | 1908.00886,1908.05172,etc |
| dark matter | 45 | 17 | 2.688 | 0.002165 | 1908.09441,1908.03722,etc |
| complex network | 111 | 28 | 4.074 | 0.002148 | 1908.08429,1908.03811,etc |
| Lyapunov exponent | 48 | 11 | 4.7 | 0.002147 | 1908.07712,1908.00717,etc |
| order parameter | 83 | 19 | 4.556 | 0.002131 | 1908.11583,1908.07714,etc |
| resonant frequency | 87 | 26 | 3.32 | 0.002126 | 1908.00802,1908.11277,etc |
| point source | 84 | 24 | 3.609 | 0.002125 | 1908.02859,1908.07991,etc |
| incident beam | 59 | 16 | 3.8 | 0.002125 | 1908.00537,1908.01473,etc |
| item We | 50 | 12 | 3.636 | 0.002117 | 1908.06043,1908.01473,etc |
| polarization state | 49 | 15 | 3.357 | 0.0021 | 1908.07562,1908.06249,etc |
| friction velocity | 44 | 11 | 4.3 | 0.00209 | 1908.05463,1908.09487,etc |
| charge transfer | 33 | 11 | 3.2 | 0.002074 | 1908.06898,1908.09351,etc |
| current flow | 36 | 11 | 3.5 | 0.002068 | 1908.06898,1908.04127,etc |
| laser field | 50 | 18 | 2.882 | 0.002057 | 1908.05379,1908.06467,etc |
| equilibrium position | 42 | 14 | 3.154 | 0.002045 | 1908.00250,1908.02387,etc |
| ground state | 306 | 90 | 3.427 | 0.002025 | 1908.05379,1908.05809,etc |
| vibrational state | 31 | 13 | 2.417 | 0.002021 | 1908.03162,1908.11839,etc |
| unit cell | 121 | 33 | 3.75 | 0.002008 | 1908.05379,1908.02736,etc |
| inertial range | 57 | 14 | 4.231 | 0.002003 | 1908.00880,1908.06474,etc |
| Reynolds number | 205 | 51 | 4.08 | 0.001993 | 1908.03540,1908.00250,etc |
| objective function | 100 | 22 | 3.952 | 0.001991 | 1908.04127,1908.10253,etc |
| paraxial approximation | 33 | 11 | 3.1 | 0.001947 | 1908.01473,1908.11520,etc |
| detection efficiency | 59 | 25 | 2.375 | 0.001938 | 1908.08117,1908.09351,etc |
| metastable state | 49 | 15 | 3.429 | 0.001935 | 1908.04846,1908.09896,etc |
| saddle point | 63 | 19 | 3.444 | 0.001934 | 1908.03875,1908.03499,etc |
| optical fiber | 35 | 17 | 2.125 | 0.001925 | 1908.06898,1908.07745,etc |
| electron temperature | 75 | 23 | 2.273 | 0.001896 | 1908.05379,1908.05149,etc |
| optical axis | 95 | 18 | 5.529 | 0.00188 | 1908.01049,1908.03798,etc |
| building block | 52 | 19 | 2.833 | 0.00188 | 1908.05463,1908.10386,etc |
| phase transition | 130 | 36 | 3.686 | 0.00186 | 1908.05809,1908.05555,etc |
| phase diagram | 90 | 24 | 2.913 | 0.001838 | 1908.01511,1908.10512,etc |
| real network | 28 | 13 | 2.167 | 0.001835 | 1908.08429,1908.03875,etc |
| free path | 75 | 22 | 3.476 | 0.001835 | 1908.01049,1908.07991,etc |
| transition point | 32 | 11 | 3.1 | 0.001834 | 1908.05462,1908.01511,etc |
| neutral atom | 51 | 17 | 3.125 | 0.001831 | 1908.08343,1908.06103,etc |
| laser pulse | 126 | 33 | 3.875 | 0.001827 | 1908.05379,1908.06467,etc |
| optical spectrum | 34 | 12 | 3.0 | 0.001817 | 1908.08789,1908.09436,etc |
| repetition rate | 58 | 29 | 2.036 | 0.001815 | 1908.01879,1908.05152,etc |
| shear modulus | 56 | 15 | 3.786 | 0.001803 | 1908.00464,1908.01568,etc |
| incident field | 56 | 18 | 3.235 | 0.001801 | 1908.01049,1908.05172,etc |
| wave function | 222 | 51 | 4.42 | 0.001791 | 1908.03722,1908.03916,etc |
| spatial resolution | 117 | 51 | 2.14 | 0.001788 | 1908.01049,1908.09441,etc |
| heat transport | 39 | 12 | 3.455 | 0.001783 | 1908.08415,1908.02896,etc |
| physical space | 32 | 16 | 2.067 | 0.001767 | 1908.10386,1908.01840,etc |
| refractive index | 118 | 47 | 2.391 | 0.001757 | 1908.09786,1908.07745,etc |
| density matrix | 94 | 22 | 4.238 | 0.001745 | 1908.00886,1908.08343,etc |
| phase difference | 117 | 36 | 3.0 | 0.00172 | 1908.02736,1908.08685,etc |
| Fermi level | 39 | 15 | 2.5 | 0.001718 | 1908.02855,1908.07991,etc |
| stochastic model | 25 | 11 | 2.4 | 0.001707 | 1908.00920,1908.03499,etc |
| room temperature | 170 | 82 | 2.086 | 0.001702 | 1908.06564,1908.06898,etc |
| rare event | 42 | 12 | 3.727 | 0.001702 | 1908.04846,1908.03747,etc |
| stable state | 42 | 15 | 2.929 | 0.001693 | 1908.04074,1908.07884,etc |
| coherence time | 28 | 13 | 2.083 | 0.001686 | 1908.06103,1908.00880,etc |
| free energy | 121 | 26 | 4.36 | 0.001686 | 1908.10756,1908.04846,etc |
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