在環保意識高漲，碳排已成國際共識的現在，動力系統電氣化，成為主要的改革方向。雖然以鋰離子電池為基礎的電動車已經不罕見，但是它不適合用在飛機、火車和船舶上。如今，著名的麻州理工學院(MIT)的研究人員，發明了一種新配方的電池，有望幫助這些交通系統實現電氣化。

這是一種燃料化電池，但是又與現行主流的氫燃料電池不同，它其實是一種空氣電池，由於負極是液態金屬鈉，就與燃料頗類似，才如此形容。鈉就是它最大的優勢，因為它很容易取得，電解食鹽(氯化鈉)就可以，簡直取之不盡用之不竭。

研究人員利用原型裝置進行實驗，證明這種鈉空氣電池單位重量的能量密度，是現行鋰離子電池的三倍以上，證明了它的發展潛力。

本文引用自: https://www.chinatimes.com/realtimenews/20250607000009-260408
The Log Periodic Antenna  as known as LPDA  is a wideband directional antenna that provides gain and directivity combined over a wide band of frequencies.
Both Log-Periodic Antennas and Yagi antennas are high gain directional antennas. The main difference between these antennas is that Log-Periodic Antennas support wider frequency bandwidths and are physically much larger than Yagi antennas.
The log-periodic dipole array typical VSWR is 2:1 and operates over a much wider bandwidth and will have a lower gain for an equivalent number of elements.
With this level of performance, it is ideal for many applications, although a log-periodic antenna will be much larger than a Yagi of an equivalent gain.
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