加州大學洛杉磯分校(University of California, Los Angeles)氣候科學家史文(Daniel Swain)說:「要是在這次事件發生前幾週,甚至幾個月有顯著或廣泛的降水,我們就不會看到目前這樣的毀滅程度。」
本文出自: https://www.chinatimes.com/realtimenews/20250110001840-260408 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.
