详细论述了电磁场和永久磁场两种模式下，端部霍尔离子源的工作稳定性、离子能量大小以及离子束分布特性的比较。
Two patterns of end-Hall ion source using electromagnet coil or permanent magnet are comparatively analysed for ion energy and distribution.
永久磁铁始终保持自己的磁场——类似于冰箱门上使用的磁铁。
These magnets always have a magnetic field—akin to the magnets used to attach things to refrigerator doors.
其它物体只有在处于永久磁铁或电磁铁形成的磁场中时才具有磁性。
Other objects become magnetic only when in a magnetic field caused by a permanent magnet or an electromagnet.
但当下方永久磁铁靠近杯底时，在磁液中产生非均匀磁场，对铝球作用一磁性浮力。
However if a permanent magnet is put near the bottom of cup it will produce a heterogeneous magnetic field and act on the aluminum ball to produce a magnetic buoyant force.
基于这一事实，即磁场可以渗透到非磁化的金属，它可以检测到一个永久磁铁重视通过气缸壁铝活塞。
Based on the fact that magnetic fields can permeate non-magnetizable metals, it is possible to detect a permanent magnet attached to the piston through the aluminium wall of the cylinder.
本文提出用间接边界元法计算任意界面的永久磁铁所产生的空间磁场，推导出其磁场计算公式。
In this paper, an IBEM (Indirect Boundary Element Method) is presented for calculating permanent magnet field, and the formula of calculating magnetic field intensity is deduced.
开展了改性前后煤表面的傅立叶红外光谱分析，结果证明，煤表面电磁改性具有时间效应，电磁场不能永久地改变煤的内部基团微观结构。
The FTIR analysis of surfaces of tested anthracites suggests that the induced modification is time dependent and can not permanently change the surface microstructure.
开展了改性前后煤表面的傅立叶红外光谱分析，结果证明，煤表面电磁改性具有时间效应，电磁场不能永久地改变煤的内部基团微观结构。
The FTIR analysis of surfaces of tested anthracites suggests that the induced modification is time dependent and can not permanently change the surface microstructure.
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