null direction

См. также в других словарях:

• Null (physics) — In physics a null is a point in a field where the field quantity is zero as the result of two or more opposing quantities completely cancelling each other. The field may be scalar, vector or tensor in nature. Common situations where nulls arise… …   Wikipedia

• Direction finding — (DF) refers to the establishment of the direction from which a received signal was transmitted. This can refer to radio or other forms of wireless communication. By combining the direction information from two or more suitably spaced receivers… …   Wikipedia

• Null hypothesis — For the periodical, see Null Hypothesis: The Journal of Unlikely Science. The practice of science involves formulating and testing hypotheses, assertions that are capable of being proven false using a test of observed data. The null hypothesis… …   Wikipedia

• Null dust solution — In mathematical physics, a null dust solution (sometimes called a null fluid) is a Lorentzian manifold in which the Einstein tensor is null. Such a spacetime can be interpreted as an exact solution of Einstein s field equation, in which the only… …   Wikipedia

• Null modem — A null modem adapter Null modem is a communication method to connect two DTEs (computer, terminal, printer etc.) directly using an RS 232 serial cable. The name stems from the historical use of the RS 232 cable to connect two teleprinter devices… …   Wikipedia

• Null vector — For other uses, see Null (disambiguation). In linear algebra, the null vector or zero vector or empty vector is the vector (0, 0, …, 0) in Euclidean space, all of whose components are zero. It is usually written with an arrow head above or below… …   Wikipedia

• Direction of fit — The technical term direction of fit is used to describe the distinctions that are offered by two related sets of opposing terms: The more general set of mind to world (i.e., mind to fit world, not from mind to world) vs. world to mind (i.e.,… …   Wikipedia

• Null (radio) — Yagi Uda antenna polar pattern showing pattern of alternating lobes and nulls In radio electronics, a null is an area or vector in an antenna s radiation pattern where the signal cancels out almost entirely. This can be an advantage, as nulls in… …   Wikipedia

• null — /nul/, adj. 1. without value, effect, consequence, or significance. 2. being or amounting to nothing; nil; lacking; nonexistent. 3. Math. (of a set) a. empty. b. of measure zero. 4. being or amounting to zero. 5. null and void, without legal… …   Universalium

• null — [[t]nʌl[/t]] adj. 1) without value or significance 2) being or amounting to nothing; nil 3) math. Math. (of a set) a) empty b) of measure zero 4) being or amounting to zero 5) elo a point of minimum signal reception, as on a radio direction… …   From formal English to slang

• null position — The position of an ADF (automatic direction finder) loop antenna when the signal being received is canceled in the two sides of the loop, and the signal strength is the weakest. At this position, the transmitting station lies in line with the… …   Aviation dictionary