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(hào))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。
Determination of elastic constants of cylindrical solidsusing backscattering amplitude spectrum 用超聲背向散射譜定征柱狀固體的彈性常數(shù)
Calculation of stress amplitude and stress amplitude spectrum coefficient for steel structure of tower crane 塔式起重機(jī)鋼結(jié)構(gòu)應(yīng)力幅及應(yīng)力幅譜系數(shù)的計(jì)算
Used fourier transforming the nuclear logs , its vertical resolution can be achieved from analyzing the changes of amplitude spectrum slope 摘要對核測井曲線進(jìn)行付氏變換,其縱向分辨率可以從分析振幅譜斜率變化中獲得。
Additionally , features of fourier amplitude spectrum and variation of duration of ground motions with depth in treasure island were discussed 最后,討論了土層基巖場地上臺(tái)陣地震動(dòng)的傅立葉幅值譜和地震動(dòng)持時(shí)沿深度變化的特點(diǎn)。
Since it is hard to choose time window in practice and analyze the error quantitatively , there are usually deviations in the evaluation of amplitude spectrum 由于在實(shí)際運(yùn)用中,以傅里葉變換相關(guān)的算法的時(shí)窗問題,難以選擇好時(shí)窗長度,而且無法定量分析時(shí)窗長度產(chǎn)生的偏差,因而會(huì)使振幅譜的估算產(chǎn)生偏差。
The paper expounds a way to get stress amplitude spectrum of main girders of overhead traveling crane through computer simulation combining virtual prototype technology and computer random simulation 摘要本文將虛擬樣機(jī)技術(shù)與計(jì)算機(jī)隨機(jī)模擬方法結(jié)合,探討了通過計(jì)算機(jī)仿真的方法獲得橋式起重機(jī)主梁應(yīng)力幅譜的基本途徑。
The algorithm used in the past was usually based on fourier transform , but there are clearly limitations in the method , because the seismic amplitude spectrum that it evaluated is the function of time windows 如果所選時(shí)窗過短,振幅譜會(huì)與變換窗函數(shù)褶積,失去頻率的局部化特徵,而且過短的時(shí)窗會(huì)使子波的旁瓣呈現(xiàn)為單一反射的假像。
Drawing on a multifunctional internal friction instrument and dma , we tested the damping capacity of all the heat treated samples completely , and then got the damping - frequency spectrum , temperature spectrum and strain amplitude spectrum 然后,在多功能內(nèi)耗儀和dma上對各熱處理態(tài)試樣的阻尼性能進(jìn)行了全面測試,獲得了內(nèi)耗頻率譜、溫度譜和振幅效應(yīng)譜。
And based on it , a new texture classification method in presented that utilizes the information of the dpft serialized amplitude spectrum in different scales and orientations as texture features , and has good performance in texture classification 提取紋理的歸一化dpft幅度譜在不同方向和尺度上的信息作為紋理特征,應(yīng)用于紋理分類,取得了良好的分類效果。