nb narrow-band 中文意思是什麼

nb narrow-band 解釋
窄帶
  • nb : Nb ＝【化學】 niobium 鈮。
  • narrow : adj 1 狹 窄 狹隘的 狹小的 （opp broad wide）。2 有限的 受限制的；有偏見的 氣量小的 心眼兒窄的；眼...
  • band : n 1 帶，繩；帶形物；箍；箍條；嵌條；鑲邊；鋸條； 〈pl 〉 （法官等的）寬領帶。2 束縛，羈絆；義務；...
  1. This dissertation is mainly concerned about the radiation of the tem - horn arrays which radiate uwb ( ultra wideband ) pulse, it mainly involves three parts : theory, numerical stimulation and experiment. the uwb antenna is a new research field in the world which has many differences from nb ( narrow band ) antenna. the most difference is that the uwb antenna such as tem - horn radiates nanosecond pulse which has wide frequency spectrum, but the nb antenna radiates single frequency signal

    超寬帶天線是一項新興的研究領域，它與窄帶天線有很多不同之處，最根本的不同在於：超寬帶天線例如tem喇叭天線是輻射納秒級短脈沖信號，這種脈沖信號有很寬的頻譜；而窄帶天線大都是輻射單一頻率時諧信號的。
  2. Clinical analysis of acitretin combined with narrow - band ultraviolet b nb - uvb in treating patients with psoriasis vulgaris

    聯合窄譜中波紫外線照射治療尋常型銀屑病臨床療效分析
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