84.00.00 Electronics; radiowave and microwave technology; direct energy conversion and storage
- 84.30.-r Electronic circuits (for integrated circuits, see 85.40.-e, for microwave circuits, see 84.40.Dc)
- 84.32.-y Passive circuit components (see also 07.50.-e Electrical and electronic instruments, and components)
- 84.35.+i Neural networks (for optical neural networks, see 42.79.Ta; see also 07.05.Mh Neural networks, fuzzy logic, artificial intelligence in computers in experimental physics; 87.18.Sn in biological complexity)
- 84.37.+q Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.)
-
84.40.-x Radiowave and microwave (including millimeter wave) technology; Microwave, submillimeter wave, and radiowave receivers and detectors, see 07.57.Kp; Microwave and radiowave spectrometers, see 07.57.Pt; Electromagnetic wave propagation, see 41.20.Jb
(1)
- 84.47.+w Vacuum tubes (see also 85.45.-w Vacuum microelectronics); Phototubes, see 85.60.Ha; Microwave tubes, see 84.40.Fe
- 84.50.+d Electric motors
- 84.60.-h Direct energy conversion and storage (see also 89.30.-g Energy resources; for electrochemical conversion, see 82.47.-a; for ocean energy extraction, see 92.05.Jn)
- 84.70.+p High-current and high-voltage technology: power systems; power transmission lines and cables (for superconducting cables, see 84.71.Fk)
- 84.71.-b Superconducting high-power technology (see also 84.30.Jc Power electronics; power supply circuits)
- 84.90.+a Other topics in electronics, radiowave and microwave technology, and direct energy conversion and storage (restricted to new topics in section 84)