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Abnormal absorption of subcritical water posts in microwave heating

机译：微波加热中亚临界水柱的异常吸收

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摘要

Subcritical water has been widely used as the solvent in microwave-assisted extractions, but the interaction between microwaves and subcritical water has been not yet fully understood. In this article, we find that there exists abnormal absorption of subcritical water posts in microwave heating at some temperatures with low loss factors. By calculating the absorbed power of a subcritical water post under exposure plane waves, the water post can still absorb microwave energies well at some temperatures even with low loss factors. It is different from the traditional view that materials can absorb little microwave power with low loss factors. By analyzing the characteristic equation, we show that the abnormal absorption is caused by dielectric resonance. This abnormal phenomenon can also be observed in applications with microwave cavities. It indicates that even with low loss factors, materials can be possibly heated by microwaves with good efficiency.
机译：亚临界水已被广泛用作微波辅助萃取中的溶剂，但微波与亚临界水之间的相互作用尚未得到充分了解。在本文中，我们发现在某些低损耗因子的温度下，微波加热中存在亚临界水柱的异常吸收。通过计算暴露平面波下亚临界水柱的吸收功率，即使损失系数很低，在某些温度下，水柱仍可以很好地吸收微波能量。与传统观点不同的是，材料吸收的微波功率很小，损耗因子低。通过分析特征方程，我们表明异常吸收是由介电共振引起的。在带有微波腔的应用中也可以观察到这种异常现象。这表明即使损耗因子低，也可以用微波高效加热材料。

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