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。
Using the relation between spectrum width and entropy and the different contributions devoted by each angle motion parameter to the echo spectrum width of the difference beam , the global optimal estimation is obtained through searching the angle motion parameters of zero and higher order via max - entropy and min - entropy respectively 該方法利用了各階運動參數(shù)對差波束回波譜寬度的不同貢獻以及熵與譜寬度的關(guān)系,通過最大熵和最小熵分別對0階和1階以上角運動參數(shù)進行搜索,得到全局最優(yōu)估計。
For our laboratory is changing toward industrialization , a lot of work on conventional ingaas / gaas / algaas quantum well laser has been done . how the parameters , such as threshold current density , slope efficiency , fwhm and spectrum width , are influenced and how much the influence is , are discussed by the numbers . the effective means how to improve a certain performance parameter are purposed too 由于本實驗室正處于由試驗研究向產(chǎn)業(yè)化邁進的階段,針對常規(guī)ingaas / gaas / algaas量子阱激光器做了很多工作,文中系統(tǒng)論述了常規(guī)量子阱激光器的各項性能參數(shù)?閾值電流密度、斜率效率、遠(yuǎn)場發(fā)散角、光譜線寬等的影響因素及改進的有效辦法,并針對激光器p ? i線性度不好、遠(yuǎn)場發(fā)散角出現(xiàn)多瓣的現(xiàn)象,通過理論分析找出原因所在并進行了改進,有效解決了以上問題。