Both nonreciprocal birefringent effect and variable polarization effect of microwave ferrite in the symmetrical four-pole magnetized field are discussed in the light of coupling-wave theory.
本文用耦合波理论处理了对称四磁极磁化情况下，微波铁氧体的非互易双折射效应和变极化效应。
The article describes the conditions in selection of four-pole switch, applicable site and points out the cautions in actual projects.
论述了四极开关选择的条件，应用场所，指出了在实际工程中应注意的问题。
The paper mainly gives the work condition of neutral current, introduces application of four-pole switch in different grounding systems and problems to be noticed.
文章主要阐述了中性线的工况和各种不同接地系统中四极开关的应用及应用中需要注意的问题。
A substructure method and a dual reciprocity boundary element method (DRBEM) are applied to calculate four-pole parameters and transmission loss of ducts and silencers with complex flow.
将子结构法和双倒易边界元法联合应用于预测具有三维复杂流存在时管道和消声器的四极参数与传递损失，阐述其基本原理与数值过程。
The four-pole parameters of muffler can be obtained using BEM, therefore the acoustic characteristics such as transmission loss can be predicted .
由边界元法计算出消声器的四极参数，从而预测传递损失等消声量。
The four-pole parameters of a straight duct and transmission loss of an expansion chamber have been calculated and compared with the results obtained by means of one-dimensional theory.
文中计算了直管段的四极参数及膨胀腔的传递损失，并与一维理论结果进行了比较。
The test stand adopts four-pole framework structure which ensures smooth and reliable operation.
井下工具试验台架主机采用四柱框架式结构，工作平稳、安全可靠；
The 3-D finite element method is used to obtain the four-pole parameters of a muffler which are in turn used to calculate the transmission loss.
为考察消声器的性能，先用三维有限元法求出消声器两端的四端子参数，然后再根据四端子参数求出消声器的传递损失。
Multifunctional Rotary Chair and Electromotive Four-pole Swing applied to vestibular functional test of astronauts are introduced.
文章介绍了用于航天员前庭功能测试的多功能转椅和四柱电动秋千。
When the motor runs in four-pole mode, it is started at two-pole mode and taps A2 and A4 are then connected together. In the meantime secondary winding is open.
当电机作四极运转时，先按二极运转启动，然后切换开关使主绕组抽头A2与A4连接电机既作四极运转，此时副绕组开路。
When the motor runs in four-pole mode, it is started at two-pole mode and taps A2 and A4 are then connected together. In the meantime secondary winding is open.
当电机作四极运转时，先按二极运转启动，然后切换开关使主绕组抽头A2与A4连接电机既作四极运转，此时副绕组开路。
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