Changes in the thickness, viscosity and conductivity of the outer core in the past could have led to convection patterns that caused the magnetic pole to tilt.

过去任何来自于核外层的厚度、粘性和导电性变化都会导致对流形式变化从而引起磁极倾斜。

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Objective to design a system of conductivity tomography using focused magnetic fields for data acquisition.

目的设计磁聚焦电导率成像系统硬件，实现数据采集。

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This paper studies the thermal conductivity, the electrical resistivity and the magnetic resistance of high purity copper, some experimental data are presented.

本文研究了高纯铜线的热导率、电阻率以及磁阻等特性，给出了必要的实验数据。

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