Providing an on-board power supply is difficult, however, so he is investigating the use of external magnetic fields to power the device.
然而，倘若板载动力装置很难实现的话，他正在研究利用外部磁场给器件提供动力的途径。
Lately, a new class of materials has emerged that manifests topological properties at room temperature and without the need of external magnetic fields.
最近，一类新的材料出现，号称不需要外磁场也能在室温下看到拓扑性质。
When external magnetic fields are absent, there may be a competitive growth between (100) and (111) surfaces; and the final morphology of particles are irregular polyhedra.
而当外磁场不存在的时候，(111)面和(100)面可能存在竞争生长的关系，从而纳米粒子呈现不规则的多面体形。
This is a specially designed magnet that allows an operator to steer the capsule around using external magnetic fields generated in a belt worn by the patient when he is being examined.
它是由一个特制的磁体制成，患者接受检查时会佩戴一条带子以产生一个外部磁场，这样医生就可以通过这个外部磁场来控制胶囊的方位。
Most materials, including milk and water, are diamagnetic, which means they are repelled by external magnetic fields-though this phenomenon is far too subtle to be observed in normal circumstances.
大多数物质，如牛奶和水都是反磁体，即他们会排斥外来磁场，这种现象很微弱，在常规条件下是几乎是观察不到的。
To achieve this objective, in-depth study is needed on the growth mechanism of carbon nano-materials by arc discharge in liquid and the effect of various arc parameters and external magnetic fields.
为了实现这个目标，就需要深入研究液体电弧放电过程中碳纳米材料的生长机理，各种电弧放电参数和外加磁场对其影响。
In measuring X-ray magnetic circular dichroism spectra by the sample current mode, signal currents are strongly affected by external fields.
在用样品电流法测量X射线磁性圆二色谱中，外磁场的存在严重降低了样品电流信号。
In measuring X-ray magnetic circular dichroism spectra by the sample current mode, signal currents are strongly affected by external fields.
在用样品电流法测量X射线磁性圆二色谱中，外磁场的存在严重降低了样品电流信号。
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