“polarity”的概念、定义、翻译、参考文献-科学参考

polarity

Electronics and Electrical Engineering

1. (magnetic) The manifestation of two types of regions in a magnet at which the inherent magnetism appears to be concentrated (poles). There are two types of magnetic pole: north-seeking (N) and south-seeking (S).
2. (electrical) The manifestation of positive or negative parameters in an electrical circuit or device. The parameters include voltage, charge, current, and majority-carrier type.

Biology

1. The property of a cell, tissue, or organism of being structurally and/or functionally different at opposite ends of its long axis. For example, plants consist of roots, which grow in the direction of the force of gravity, and stems, which grow away from the gravitational force (see geotropism). In developing insect embryos, the anterior-posterior polarity of larval body segments is determined by segment polarity genes. (see segmentation genes). See also animal pole.
2. The property of molecules of having an uneven distribution of electrons, so that one part has a positive charge and the other a negative charge. Such polar molecules include water.

Geology and Earth Sciences

The direction of evolutionary change. The polarity of different states of a character means whether these are primitive or derived.

单词	polarity
释义	polarity Electronics and Electrical Engineering 1. (magnetic) The manifestation of two types of regions in a magnet at which the inherent magnetism appears to be concentrated (poles). There are two types of magnetic pole: north-seeking (N) and south-seeking (S). 2. (electrical) The manifestation of positive or negative parameters in an electrical circuit or device. The parameters include voltage, charge, current, and majority-carrier type. Biology 1. The property of a cell, tissue, or organism of being structurally and/or functionally different at opposite ends of its long axis. For example, plants consist of roots, which grow in the direction of the force of gravity, and stems, which grow away from the gravitational force (see geotropism). In developing insect embryos, the anterior-posterior polarity of larval body segments is determined by segment polarity genes. (see segmentation genes). See also animal pole. 2. The property of molecules of having an uneven distribution of electrons, so that one part has a positive charge and the other a negative charge. Such polar molecules include water. Geology and Earth Sciences The direction of evolutionary change. The polarity of different states of a character means whether these are primitive or derived.
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