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Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
資料來源：健康醫療網 https://www.healthnews.com.tw/readnews.php?id=62360
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本文出自: https://n.yam.com/Article/20240722469077
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.
【健康醫療網／記者張慈恩報導】中醫門診中不乏見到焦急的家長帶著便祕肚子痛的小朋友來求診。學齡前的幼童，常因不善表達或身體還無法辨識要大便的感覺，因此沒有養成規律排便習慣，若長期忽視便秘症狀，受影響的不只有腸胃，從排尿到生長發育、情緒、睡眠等都會出現問題，父母不可不慎。
9成屬於「功能性便秘」 好發嬰兒、戒尿布及初上學Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
小兒便秘有超過9成是屬於功能性便秘，腸道蠕動是正常的，根據研究指出，小朋友最容易發生便秘的三個時期分別是：小嬰兒開始嘗試副食品時期、小朋友2-3歲開始練習戒尿布時期，以及小朋友開始上學時期。
常見導致便秘因素包含飲食改變，纖維或水分攝取不足、解便習慣改變、外在環境影響、解便時疼痛、心理壓力，例如過早做如廁訓練等。而不好的排便經驗常使小兒有意無意間避開排便或忍住便意，初期會造成大便硬結難出，日久將造成直腸擴張而變成習慣性便秘。
中醫藥物改善 輔以父母按摩調理
臺北市立聯合醫院林森中醫昆明院區中醫兒科主治醫師胡玉芳說，以中醫觀點來看，小兒脾常不足、陰常不足，腸胃功能尚無法有效運作，中醫會依辨證給予滋陰潤燥、消食導積或潤腸通便等藥物做治療，除此之外，父母也可以幫小孩做按摩調理，增進親子關係，例如在腹部的天樞穴、大橫穴、中脘穴以順時鐘方向做摩腹（將手指併攏或用掌心在穴位處撫擦），下肢的足三里穴或上巨虛穴也可以做按摩。
超重及肥胖兒童 便秘風險增加1.9倍
便秘的發生涉及遺傳、腸道功能、生活習慣和心理壓力等多種因素，隨著現代人飲食習慣改變，攝入精緻加工食品的機會增加，高熱量飲食引起肥胖逐漸成為兒科醫師關注的健康問題。有一項整合分析研究結果顯示，與BMI正常的兒童相比，超重／肥胖兒童發生便秘的風險增加1.9倍，因此養成規律運動的習慣，不僅增加腸胃蠕動也能控制體重，預防便秘。
【延伸閱讀】
資料來源：健康醫療網 https://www.healthnews.com.tw/readnews.php?id=62360
喜歡本文請按讚並分享給好友！ 更多健康資訊：健康醫療網https://www.healthnews.com.tw
本文出自: https://n.yam.com/Article/20240722469077
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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