84. Electronics; radiowave and microwave technology; direct energy conversion and storage ( 0 Dok.)

• 84.30.-r Electronic circuits (for integrated circuits, see 85.40, for microwave circuits, see 84.40.D) ( 0 Dok. )

• 84.32.-y Passive circuit components (see also 07.50 electrical and electronic components, instruments, and techniques) ( 0 Dok. )

• 84.35.+i Neural networks (for optical neural networks, see 42.79.T, see also 07.05.M Neural networks, fuzzy logic, artificial intelligence in computers in experimental physics; see also 87.18.S in multicellular phenomena) ( 0 Dok. )

• 84.37.+q Electric variable measurements (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.) ( 0 Dok. )

• 84.40.-x Radiowave and microwave (including millimeter wave) Technology Microwave, submillimeter wave, and radiowave receivers and detectors, see 07.57.K Microwave and radiowave spectrometers, see 07.57.P Electromagnetic wave propagation, see 41.20.J ( 0 Dok. )

• 84.47.+w Vacuum tubes (see also 85.45 Vacuum microelectronics) Phototubes, see 85.60.H Microwave tubes, see 84.40.F ( 0 Dok. )

• 84.50.+d Electric motors ( 0 Dok. )

• 84.60.-h Direct energy conversion and storage ( 0 Dok. )

• 84.70.+p High-current and high-voltage technology: power systems; power transmission lines and cables (including superconducting cables) ( 0 Dok. )

• 84.90.+a Other topics in electronics, radiowave and microwave technology, and direct energy Conversion and storage (restricted to new topics in section 84) ( 0 Dok. )