綜合美聯社、路透社、日本放送協會(NHK)報導,印尼時間周四深夜11時(台灣時間周五凌晨0時)左右,東努沙登加拉省(Nusa Tenggara Timur)標高1584公尺的勒沃托比拉基拉基火山(Mount Lewotobi Laki-Laki)大規模噴發,持續了11分9秒,距離火山約50至85公里的城市東部拉蘭圖卡(Larantuka)、墨梅爾(Maumere)都能聽到噴發聲響。周五白天又發生2次爆發與1次小規模噴發,火山灰柱最高8000公尺。火山口周圍煙霧迷漫,山頂可見火光。網路社群流傳畫面顯示,火山口附近村莊民宅滿地碎石。
🌋Eruption of Mt Etna in #Italy 🌋Activity at Kilauea volcano, Hawaii, #USA 🌋Eruption of Lewotobi volcano. Ash ejected to 8 000 meters high, #Indonesia 🌡️Temperature records in South #Siberia. Air warmed up to May tC#seismepic.twitter.com/lJHyd81FdX
本文引用自: https://www.chinatimes.com/realtimenews/20250321003948-260408 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.
