A new method of recovery of pure Fe powder from the magnetic filtered product in cold-rolling emulsion is reported in this article.

报道了从冷轧乳化液的磁过滤产物中回收纳米铁粉的一种新方法。

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Nowadays there are many methods to observe the magnetic domain structure, including powder-pattern method, magneto-optical effect method and electron holography method, etc.

目前，磁畴观测的方法已有很多种，如粉纹图法、磁光效应法、电子全息法等。

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It was pointed out that the crackles produced on vessels operating under wet H2S circumstance can only be detected effectively by the wet magnetic powder fluorescent method.

指出，只有采用湿萤光磁粉探伤法才能有效地检查在湿硫化氢环境下操作的容器可能产生的裂纹。

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