| Acronym | Meaning |
 | ULEV | Ultra Low Emission Vehicle |
| BTDA | 3,3',4,4'-benzophenonetetracarboxylic Dianhydride |
| TKN | Total Kjeldahl Nitrogen |
| BTB | Bromothymol Blue |
| RIR | Reference-intensity Ratio |
| PSHF | Pseudospectral Hartree-Fock |
| JANAF | Joint Army Navy Air Force |
| HDR | Hot Dry Rock (geothermal Reservoir) |
| IAAD | Ion Assisted Arc Deposition |
| FLMS | Femtosecond Laser Mass Spectrometry |
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