hf safety 中文意思是什麼

hf safety 解釋
氫氟酸安全
  • hf : Hf = 【化學】 hafnium.
  • safety : n. 1. 安全;平安,穩安,保險。2. (槍等的)保險器,安全瓣;〈口語〉低座腳踏車[自行車] (=safety-bicycle)。3. 安全設備,保險裝置。4. 【棒球】安全打。
  1. Frequency - hopping ( fh ) is a novel spread spectrum communication technique, which develops very fast in military field due to its lpi / lpd ( low probability of intercept / detection ) properties and immunity against interferences, the extensive application of hf / vhf ( high frequency / very high frequency ) frequency - hopping radios in military has greatly enhanced the ability of military equipments against jamming and interception and ensure the safety and validity of chain of military command

    跳頻技術是擴頻技術的一種,是80年代以來出現的一種新的通信方式。跳頻通信具有良好的抗干擾性,低截獲概率及組網能力,因此跳頻技術的一出現,便在軍事領域得到了極大的發展。採用跳頻技術的短波超短波電臺在軍事通信中得到了廣泛應用,極大地提高了軍事裝備的抗截獲和抗干擾能力,保證了軍事指揮系統的安全和有效性。
  2. At present, the crystal growth equipment is equipped with vacuum tube hf ( lmhz - 2. 5mhz ) induction heating power supply. while this supply has many disadvantages, such as low reliability, short longevity of vacuum tube, operational safety, low transfer efficiency

    目前,用於晶體生長的區熔式單晶爐配套使用的是國外進口或國內生產的真空電子管式高頻感應加熱電源,存在諸如可靠性差、電子管使用壽命短、操作不安全、變換效率低等問題。
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