Transposition


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transposition

[‚tranz·pə′zish·ən]
(communications)
Interchanging the relative positions of conductors at regular intervals along a transmission line to reduce cross talk.
(mathematics)
A permutation of a set of symbols which exchanges exactly two while leaving all others unaffected.

Transposition

 

in electrical engineering, a change in the relative position of the conductors of individual phases along the length of an overhead power line in order to reduce the undesirable influence of power lines on one another and on nearby communication lines. To make a transposition, an entire power line is arbitrarily divided into sections, the number of which is a multiple of the number of phases. In each successive section the phases change places, so that each phase eventually occupies the positions of the others. The length of a section is determined by the conditions for reliable operation of the power line, the cost of constructing the power line, and the requirements for balance of the power line’s currents and voltages; the balance increases as a result of the equalization of the inductances and capacitances of the power line’s phases in a transposition section. Transpositions are made on power lines that are over 100 km in length and have voltages of 110 or more kilovolts. A complete phase-transposition cycle covers a length of not more than 300 km.

REFERENCE

Mel’nikov.N. A. Elektricheskie seti i sistemy. Moscow, 1975.

Transposition

 

in mathematics, a permutation of the elements of a given set whereby two elements are interchanged. For example, 13452 is transformed into 53412 by a transposition that interchanges the elements 5 and 1. (SeePERMUTATION.)


Transposition

 

in music, the transfer of all the notes of a composition to a designated lower or higher key. Transposition by any interval other than an octave results in a change of key. The purpose of transposition is to adapt musical compositions for performance to a higher or lower voice or to an instrument with a different range. Transposition may also facilitate reading by reducing the number of sharps and flats needed in notation.

References in periodicals archive ?
This stresses the importance of marking the ovaries with metallic clips when adnexal transposition is performed, in order to locate them on radiological examination.
One of the advantages cited by advocates of anterior transposition of the ulnar nerve at the cubital tunnel is that the nerve, in its new position, is less subject to stretch on elbow flexion.
Through a right thoracotomy and right neck dissection, both ends of the failed gastric transposition were identified, and 30 centimeters of jejunum with its vascular arcade were removed from the abdomen and the artery flushed with heparin.
In Chapter 4 Majewski concentrates on Balzac's La Fille aux yeux d'or, a text which is not a direct transposition of a particular work of Delacroix but uses Delacroix's paintings as a kind of intertextual device.
21 Cell, the two research groups show that the pair of proteins can perform a complete transposition reaction in a cell-free system.
This unique fragment might have resulted either from transposition or from some type of rearrangement unrelated to transposition, such as recombination or deletion.
This will facilitate comprehension if you are using English as the lingua franca; equally, it will facilitate translation or transposition if you are going for parallel versions in a foreign language.
For late transposition cases, Cyprus and Belgium had the highest amount of open cases, whereas the fewest were open in Italy, Slovakia and Denmark.
After receiving a letter of formal notice, Member States have two months to reply to the letter of formal notice and in cases of non-communication have to notify their national transposition measures to the Commission.
The European Commission decided, on 24 January, to refer Bulgaria, Estonia and the United Kingdom to the EU Court of Justice, raising to six the number of member states taken to court over incomplete transposition of EU rules on the internal energy market (third energy package).