- Kirchoff approximation
- 克希何夫近似
Atmospheric Sciences (English-Chinese) dictionary. 2014.
Atmospheric Sciences (English-Chinese) dictionary. 2014.
Optics — For the book by Sir Isaac Newton, see Opticks. Optical redirects here. For the musical artist, see Optical (artist). Optics includes study of dispersion of light. Optics is the branch of … Wikipedia
Huygens–Fresnel principle — Wave refraction in the manner of Huygens … Wikipedia
Low-pass filter — A low pass filter is a filter that passes low frequency signals but attenuates (reduces the amplitude of) signals with frequencies higher than the cutoff frequency. The actual amount of attenuation for each frequency varies from filter to filter … Wikipedia
Charles Wheatstone — Wheatstone, drawn by Samuel Laurence in 1868 Born 6 … Wikipedia
Mesoamerican calendars — Stelae 12 and 13 from Monte Alban, provisionally dated to 500 400 BCE, showing what is thought to be one of the earliest calendric representations in Mesoamerica.[1] Mesoamerican calendars are the calendrical systems devised and used by the pre… … Wikipedia