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| Russian | English |
| отрицательная дифференциальная проводимость | negative differential conductivity |
| отрицательное дифференциальное сопротивление | negative differential resistance (Germanium has a very special electronic structure: when you apply voltage, the current flow initially increases, as you would expect. After a certain threshold, however, the current flow decreases again – this is called negative differential resistance.) |