zero (null) point
41Optical heterodyne detection — is an important special case of heterodyne detection. In heterodyne detection, a signal of interest at some frequency is non linearly mixed with a reference local oscillator (LO) that is set at a close by frequency. The desired outcome is the… …
42Cortical visual impairment — (CVI) is a form of visual impairment that is caused by a brain problem rather than an eye problem. (The latter is sometimes termed ocular visual impairment when discussed in contrast to cortical visual impairment.) Some people have both CVI and a …
43Mass versus weight — The chains on the swing hold all the child’s weight. If one were to stand behind her at the bottom of the arc and try to stop her, one would be acting against her inertia, which arises purely from mass, not weight. In everyday usage, the mass of… …
44loop aerial — An aerial designed for direction finding use and normally used in airborne direction finding equipment. A vertical polarized radio wave incident upon the loop induces voltage in the vertical members of the loop. The signal induced voltage will… …
450 (number) — Zero redirects here. For other uses, see Zero (disambiguation). 0 −1 0 1 2 3 4 5 6 7 8 …
46Zeroes — Zero e ro, n.; pl. {Zeros}or {Zeroes}. [F. z[ e]ro, from Ar. [,c]afrun, [,c]ifrun, empty, a cipher. Cf. {Cipher}.] [1913 Webster] 1. (Arith.) A cipher; nothing; naught. [1913 Webster] 2. The point from which the graduation of a scale, as of a… …
47Zeros — Zero e ro, n.; pl. {Zeros}or {Zeroes}. [F. z[ e]ro, from Ar. [,c]afrun, [,c]ifrun, empty, a cipher. Cf. {Cipher}.] [1913 Webster] 1. (Arith.) A cipher; nothing; naught. [1913 Webster] 2. The point from which the graduation of a scale, as of a… …
48Pointer (computing) — This article is about the programming data type. For the input interface (for example a computer mouse), see Pointing device. Pointer a pointing to the memory address associated with variable b. Note that in this particular diagram, the computing …
49EIA-708 — is the standard for closed captioning for ATSC digital television streams in the United States and Canada. It was developed by the Electronic Industries Alliance.Unlike most DVB captions, EIA 708 captions are textual like traditional Line 21… …
50Lie sphere geometry — is a geometrical theory of planar or spatial geometry in which the fundamental concept is the circle or sphere. It was introduced by Sophus Lie in the nineteenth century. [The definitive modern textbook on Lie sphere geometry is Harvnb|Cecil|1992 …
