| 词汇 | commutator |
| 释义 | commutator noun[ C ] electronics specializeduk /ˈkɒm.jə.teɪ.tər/ us /ˈkɑː.mjə.teɪ.t̬ɚ/ a device used in some types of electric motors to change the direction in which an electric current is flowing转接器（换向器）（电动机中的装置，改变电流方向） Electrical components & circuitry accumulator AGM battery anode armature bandpass filter baseband chip cathode ray circuit breaker coil conductor LED display multicelled multiconductor negative pole number pad OLED photoresist photovoltaic cell relay transformer Brushes sparking badly on commutator of dynamo—due to poor contact. Q. Why should sandpaper be used to smooth commutator instead of emery cloth? The first dynamos were constructed with two commutator bars. There are fifteen sections in the commutator, and each coupling is connected to a section. These vibrations are adjusted to a very narrow range, but are sufficient to close the contacts of a commutator which reverses the current at each semi-vibration of the pendulum. Examples of commutatorcommutator Taken together, throwing away terms of high enough grade and the removal of terms with even l after summation removes a high proportion of commutators. It reduces the free invariants into products of d-triangles and commutator words. Each hole connected by nylon hydraulic tubing to a ' fluid commutator ', a manifold containing a rotatable, ported centre-body. We have already exploited skew symmetry of the commutator in the derivation and 'beautification' of our integration formulae. For high-order methods, a significant number of commutators must be computed if dexp-1 is computed using (2.46). It is difficult to formalize the last two steps, involving two or more commutators. So, one could say that stable commutator length and homogeneous quasi-morphisms are in duality. A special feature of this transducer is that the output is free from any noise induced from commutator friction. In general, the number of terms counted according to power is significantly smaller than similar enumeration by the number of commutators. An essential role is played by the commutator. For the nonabelian case we give a partial characterization of the group of free invariants in terms of 'characteristic' powers of triangles and commutator words. The degree to which the flows of two vector fields fail to commute is measured by the commutator of the two vector fields. Provided that d is small, typically we can obtain the commutator matrix and its exponential explicitly. In other words, the length function merely counts commutators. At present there is no theory that systematically reduces the number of commutators to minimum. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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