User contributions for 122.11.177.254

12 January 2023

• 01:3701:37, 12 January 2023 diff hist +49‎ Faraday cage ‎ →‎Faraday cage: rectified wrong wording regarding skin depth

7 October 2020

• 07:2307:23, 7 October 2020 diff hist +92‎ TraceTogether ‎ →‎Privacy and data: qualified that fine-grained location tracking is inherently trivial using bluetooth beacons Tag: Reverted

4 September 2020

• 06:4606:46, 4 September 2020 diff hist +3‎ Yaesu FT-817 ‎ Removed wrong claim about FT817 circuit board being identical to FT857/891.

28 November 2019

• 02:1302:13, 28 November 2019 diff hist +64‎ Spectrum analyzer ‎ qualified notion that spectrum analyzers operate on electrical signals

24 September 2019

• 08:5908:59, 24 September 2019 diff hist −33‎ AC power ‎ →‎{{anchor|Active power|Reactive power|Apparent power|Complex power|Real power}}Active, reactive, and apparent power: clarified proper SI units (engineering use is notoriously incorrect)
• 01:2401:24, 24 September 2019 diff hist +112‎ Power factor ‎ PF is a ratio of averages and is not based on instantaneous power (which oscillates over an AC cycle).

17 September 2019

• 08:0408:04, 17 September 2019 diff hist 0‎ Power factor ‎ Comparisons of instantaneous power in the presenve of "a" phaseshift are meaningless, since two pahseshifts (V and I relative to a reference) need to be specified. If voltage is taken as zero phase reference, instantaneous power actually increases for certain times in the oscillation cycle if the current is phase shifted.

11 September 2019

• 07:0007:00, 11 September 2019 diff hist −17‎ Hyperbolic navigation ‎ hyperbolic navigation requires neither fixed nor land-based transmitters.
• 06:5906:59, 11 September 2019 diff hist −9‎ Hyperbolic navigation ‎ removed unjustifiable "obsolete" attribute since contemporary navigation systems (GPS, Galileo, GLONASS, ...) are all hyperbolic navigation systems.

31 July 2019

• 03:3103:31, 31 July 2019 diff hist +267‎ Uncertainty principle ‎ depending on interpretation, uncertainty principle is not about limits of knowledge but about mathematically mutually contradicting definitions of conjugate properties

25 July 2019

• 03:3603:36, 25 July 2019 diff hist −19‎ Ground (electricity) ‎ →‎Circuit ground versus earth: corrected wrong use of the term "voltage" vs "potential"; "ground" rather than "common" is (technically incorrect) jargon.

18 July 2019

• 01:5701:57, 18 July 2019 diff hist −3‎ Snow City ‎ →‎Technology: -196 deg C is not the freezing point of nitrogen, but the boiling point. The end product are not genuine slowflakes (which originate from the meteorological phenomen of snow)

9 July 2019

• 08:2108:21, 9 July 2019 diff hist −17‎ Dipole antenna ‎ →‎Dipole variations: Corrected explanation of free space impedance, which was the wrong way round (E/H instead of H/E).

11 June 2019

• 03:1003:10, 11 June 2019 diff hist +22‎ MicroPython ‎ MicroPython is not a Python 3 implementation - there are syntactic and semantic differences for existing features, and many Python 3 features are unimplemented

7 June 2019

• 01:5401:54, 7 June 2019 diff hist +45‎ History of spectroscopy ‎ →‎Early 20th century (1900-1950): Bohr did not observe spectral lines, but developed an atomic model to explain the wavelengths of spectral lines that had been experimentally known/observed for decades.

23 April 2019

• 10:4510:45, 23 April 2019 diff hist −10‎ Quantum decoherence ‎ "observed WF collapse" -> "apparent collapse"

21 March 2019

• 02:3502:35, 21 March 2019 diff hist +124‎ Open source ‎ →‎"Open" versus "free" versus "free and open": Clarified meaning of "open source" in line with the cited reference (Stallman); the original article stated the opposite of what Stallman's article was pointing out.

1 February 2019

• 02:1702:17, 1 February 2019 diff hist +160‎ Quantum decoherence ‎ Made introduction easier to understand by comparing to friction.
• 01:4501:45, 1 February 2019 diff hist +161‎ D-Wave Systems ‎ /* Even classical electronic components employ quantum physics, e.g. semiconductior band model, tunneling in flash/programmable memory, spin dynamics in magnetic storage media and read heads, ...

25 September 2018

• 02:1102:11, 25 September 2018 diff hist +330‎ Speed of electricity ‎ →‎Electromagnetic waves: clarified wording as EM wave does not travel *only* in the dielectric.
• 01:5501:55, 25 September 2018 diff hist −215‎ Electrical resistivity and conductivity ‎ →‎In metals: removed link to "Newton's cradle" animation since it promotes a misconception a misconception how an electric signal is propagated
• 01:5401:54, 25 September 2018 diff hist −192‎ Electrical resistivity and conductivity ‎ →‎In metals: removed "newton's cradle packed electrons" analogy which is manifestly wrong. Tag: references removed

6 September 2018

• 01:2001:20, 6 September 2018 diff hist +367‎ Homodyne detection ‎ →‎Applications: Added lock-in amplifier as the general name for homodyne detectors in lab experiments.