spectrum n. (pl. -tra ) 1.【物理學(xué)】譜,光譜;波譜;能譜,質(zhì)譜。 2.【無線電】射頻頻譜;無線電(信號)頻譜。 3.【心理學(xué)】(眼睛的)余像;殘像。 4.〔轉(zhuǎn)義〕范圍,幅度;(連續(xù)的)系列。 an absorption spectrum 吸收(光)譜。 a bright line spectrum 線狀光譜。 an optical spectrum 光譜。 a solar spectrum 太陽光譜。 a wide spectrum of opinion 意見的不同幅度甚大。
Development of a shock response spectrum test facility 一種沖擊譜試驗機的研制
Simulation study of a shock response spectrum test facility 沖擊譜試驗裝置仿真研究
Cognitive radio uses spectrum adaptive technology to realize dynamic spectrum allocation , as well as the spectrum testing , channel estimation and prediction , data transmission , and multi - antenna communications technologies 它通過頻譜自適應(yīng)技術(shù)來實現(xiàn)動態(tài)頻譜分配,相關(guān)技術(shù)包括頻譜檢測技術(shù),信道估計與預(yù)測技術(shù)、數(shù)據(jù)傳輸技術(shù)和多天線通信技術(shù)。
The ft - ir and the energy spectrum tests confirm that aluminium zirconium organic metal coupling agent has been grafted onto the surface of tio2 and sem test shows better dispersion of ultrafine tio2 after modification 紅外光譜和能譜分析表明,在超微二氧化鈦粉體表面接枝上了鋁鋯有機基團;通過掃描電鏡可看出經(jīng)過改性后的超微二氧化鈦分散性得到改善。
At first the idiographic algorithm choice is determined with spectrum test and listen test . and then the flow and pivotal technologies of lame are introduced . at last the composition and realization under visual c + + of lame is illuminated 首先,對幾種常見mp3編碼算法做頻譜測試和聽音測試,根據(jù)測試效果確定要選擇哪種mp3音頻編碼算法;其次,根據(jù)lame具體算法的實現(xiàn)研究其程序流程和關(guān)鍵技術(shù);最后,給出lame的具體組成,實現(xiàn)了其在軟件環(huán)境visualc + +下的mp3編碼。
By testing some parameters , such as the maximum non - seizure load , the shape and diameter of wear scar , the friction factor , the nanometer caco3 particles " properties of extreme pressure , anti - wear and friction reduction have been tested and analyzed . the properties of the nanometer caco3 particles " tribology chemistry have been analyzed through x - ray photoelectron spectrum test . also the nanometer caco3 particles " mechanism of anti - wear and friction reduction has been studied systematically 通過測試最大無卡咬負荷、觀察磨斑表面形貌和測定磨斑直徑以及測試摩擦系數(shù),對納米碳酸鈣粒子的極壓性能和抗磨減摩性能進行了分析和研究;通過xps測試對納米碳酸鈣潤滑油添加劑進行了摩擦化學(xué)的分析和研究,對于納米碳酸鈣粒子的抗磨減摩機理做了系統(tǒng)的分析。