近日，巴西的甲烷（Methan）氣體排放量在 2020 至 2023 年間增加了 6 %，並在2024年達到2110萬噸，創下該國有史以來第2高的紀錄，引發國際關注。

巴西擁有全球第2高的牛隻數量，是全球最大的牛肉出口國，在牛肉供應鏈中扮演關鍵角色，且目前是世界第5大甲烷排放國，僅次於中國、美國、印度、俄羅斯。

根據巴西氣候觀測所 (Climate Observatory) 發布的研究指出，2023年巴西約75%的甲烷氣體排放量來自畜牧業牛隻，總計高達1450萬噸，相當於4.06億噸二氧化碳當量，甚至多過2023年義大利全國的溫室氣體排放量總和。

本文來自: https://www.chinatimes.com/realtimenews/20250901002401-260408
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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