牙科醫生警告說，隨著酸性飲料和加工食品消費量的增加，年輕族群的牙齒問題日益嚴重， 如果持續不重視，隨著蛀牙的惡化與年紀的增長，很可能引發成敏感、動搖，甚至掉牙。所幸，一種能夠在刷牙時順便補牙的新配方牙膏正在開發中，或吘很快就會成為牙齒護理的新工具；有趣的是它的主要配方竟然來自人類的頭髮，是利用頭髮蛋白質的強韌特性。

Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)有趣的工程(Interesting Engineering)報導，倫敦國王學院的研究人員表示，頭髮頗具韌性，這是大家都知道的，那其實羊毛也是相同的配方，都是角蛋白。甚至指甲、牛角、猛獸的利爪、草食動物的腳蹄也都是角蛋白。

雖然角蛋白的硬度不如牙齒，但是它可以在蛀牙初期時填補蛀洞。在遇到唾液中的礦物質時，具有角蛋白的配方會在蛀洞上形成一層保護塗層，以阻止持續的酸蝕。實驗室測試表明，基於角蛋白的治療方案完全阻止了蛀牙，而且它們還能封閉暴露的牙神經通道，也就緩解牙齒敏感。

文章來自: https://www.chinatimes.com/realtimenews/20250814005105-260408
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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