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Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
幹細胞治療脊髓損傷傳來好消息 患者恢復部分運動能力
日本科學家表示，在首次的實驗性幹細胞治療脊髓損傷患，有一半的患者運動功能明顯改善；其他患者即使效果不顯著，也沒發現不良反應，這為將來的研究開啟了一道門。
醫療訊息（MedicalxPress）報導，脊髓神經損傷後就難以修復，因脊髓損傷導致的癱瘓尚無有效治療方法，光在日本，就有超過15萬名患者，每年還有5,000例新發病例，多數因意外事故而造成。
東京慶應義塾大學的研究人員，正在利用誘導性多功能幹細胞(Induced pluripotent stem cell,iPS)進行脊損修復的研究，所謂的iPS，是透過刺激成熟的、已經特化的細胞，回到幼年狀態而產生的。也就是說，這種幹細胞可以取材自健康的身體組織，也就沒有異體移植造成的排斥風險。
文章來自: https://www.chinatimes.com/realtimenews/20250323003491-260408
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.
Horn Antenna 《花香2》專訪／林辰唏把她當女兒照顧「關係失衡」 程予希：鍾亭亭在愛裡很自卑
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