A novel method based on the Graham scan is proposed to extract the chief wave of the spectrogram envelop, while an improved angle detection method is applied to recognize the features.
基于格雷厄姆掃描算法提出聲譜圖包絡(luò)主波提取的新方法,并用改進(jìn)的角度探測方法進(jìn)行包絡(luò)特征的識別。
The results show that two particular and wide absorption bands,band a1 (425～428 nm) and band a3(693～688 nm),are present in Qingu turquoise samples,and the dominant wavelength and purity of the visible absorption spectrum are corresponding to the colour characteristics.
采用USB2000微型光纖光譜儀測試了湖北秦古綠松石樣品的可見吸收光譜,結(jié)果表明,該樣品在可見光范圍內(nèi)存在a1(425~428 nm)和a2(683~688 nm)兩處特征的吸收寬譜帶,其可見吸收光譜主波長和純度的變化與顏色特征具有一定的對應(yīng)關(guān)系。
By using the PUV method,a method to compute wave directional spectrum with observed pressure and current vectors,the wave directional spectrum can be calculated and the dominant wave direction is then obtained.
海洋水文多參數(shù)測量儀是南海海洋研究所新研制的一種可以同步測量海流、波浪、潮位、水溫、電導(dǎo)率的儀器,利用同步觀測壓力和矢量流速估計海面方向譜的方法(PUV方法)可以計算得到海面方向譜,進(jìn)而求得主波向。
The system is divided into six parts, which are central waveguide, coupling, detector, filter, connection and test results.
本文設(shè)計的波導(dǎo)功率傳輸組件為總裝部合同項目,應(yīng)用于某型號導(dǎo)引頭系統(tǒng)中,起到功率的傳輸、濾波檢波及監(jiān)控作用,其結(jié)構(gòu)包括了主波導(dǎo)傳輸、耦合機(jī)構(gòu)、檢波和濾波部件等。