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- этимология
Что (кто) такое null-coil magnetometer - определение
Exploring coil; Search-coil magnetometer; Fluxmeter; Search coil
Null allele
NONFUNCTIONAL ALLELE (A VARIANT OF A GENE) CAUSED BY A GENETIC MUTATION
Null mutation; Null Allele; Null alleles; Null mutant
A null allele is a nonfunctional allele (a variant of a gene) caused by a genetic mutation. Such mutations can cause a complete lack of production of the associated gene product or a product that does not function properly; in either case, the allele may be considered nonfunctional.
Null (SQL)
![omega (ω)]] character is used to represent Null in [[database theory]].](https://commons.wikimedia.org/wiki/Special:FilePath/Db null.png?width=200 "omega (ω)]] character is used to represent Null in [[database theory]].")
![outer join]] query with Null placeholders in the result set. The Null markers are represented by the word <code>NULL</code> in place of data in the results. Results are from [[Microsoft SQL Server]], as shown in SQL Server Management Studio.](https://commons.wikimedia.org/wiki/Special:FilePath/Sql query1.png?width=200 "outer join]] query with Null placeholders in the result set. The Null markers are represented by the word <code>NULL</code> in place of data in the results. Results are from [[Microsoft SQL Server]], as shown in SQL Server Management Studio.")
SPECIAL MARKER AND KEYWORD IN SQL INDICATING THAT SOMETHING HAS NO VALUE
Sql null; NULL (SQL); NVL; NULLIF; SQL CASE; Sql case; Codd tables; Codd table; COALESCE; C-table; Uncertain database; NULL marks; Null (database)
In SQL, null or NULL is a special marker used to indicate that a data value does not exist in the database. Introduced by the creator of the relational database model, E.
Winding
ELECTRICAL COMPONENT
Magnetic coil; Winding; Windings in electric machinery; Electromagnetic Coil; Coil (electrical engineering); Windings; Coil (electromagnetism)
·noun A call by the boatswain's whistle.
II. Winding ·p.pr. & ·vb.n. of Wind.
III. Winding ·p.pr. & ·vb.n. of Wind.
IV. Winding ·p.pr. & ·vb.n. of Wind.
V. Winding ·adj Twisting from a direct line or an even surface; circuitous.
VI. Winding ·noun A turn or turning; a bend; a curve; flexure; meander; as, the windings of a road or stream.
VII. Winding ·add. ·noun The material, as wire or rope, wound or coiled about anything, or a single round or turn of the material;.
VIII. Winding ·noun A line- or ribbon-shaped material (as wire, string, or bandaging) wound around an object; as, the windings (conducting wires) wound around the armature of an electric motor or generator.
IX. Winding ·add. ·noun a series winding, or one in which the armature coil, the field-magnet coil, and the external circuit form a continuous conductor; a shunt winding, or one of such a character that the armature current is divided, a portion of the current being led around the field-magnet coils.
Википедия
Search coil magnetometer
The search coil magnetometer or induction magnetometer, based on an inductive sensor (also known as inductive loop and inductive coil), is a magnetometer which measures the varying magnetic flux. An inductive sensor connected to a conditioning electronic circuit constitutes a search coil magnetometer. It is a vector magnetometer which can measure one or more components of the magnetic field. A classical configuration uses three orthogonal inductive sensors. The search-coil magnetometer can measure magnetic field from mHz up to hundreds of MHz.
