threshold magnitude 中文意思是什麼
threshold magnitude
解釋
臨界震級-
In this paper, two methods are applied to provide the minimum completeness magnitude distribution of seismic catalog within the studied area for a given period. one is used to calculate the lower threshold of the controlled magnitude by seismic station network, which has paid significant role in the design for building seismic station network in the project named capital region earthquake prevention and hazard mitigation demonstration area. the other is applied to result in the distribution of the lower magnitude threshold that follows the g - r relation by directly analyzing seismic catalog
本論文採用兩種方法來給出研究區域一定時期內的地震目錄的最小完全性震級的分佈，一種方法是通過地震臺網來計算控制震級下限的分佈，通過本論文的空間處理方法處理的結果在「首都圈防震減災示範區」工程的地震臺網的設計時發揮了重要的實際作用；另一種方法是通過對地震目錄的分析直接獲取滿足g - r關系的震級下限的分佈，本論文提出了通過限制不同震級地震參與完全性分析的有效距離的方法，增強了這種方法的合理性。 -
Secondly, the nonlinear joint transform correlation recognition and the photorefractive correlation recognition are investigated by computer simulation and experiment, and the research results are given as following : ( 1 ) the correlation discrimination of the jtc can be greatly improved by binarizing the joint transform power spectrum nonlinearly. it is found in our experiment that the threshold magnitude has great influence on the correlation output of a binary jtc
其次，通過理論分析、計算機模擬和實驗研究的方法，對非線性聯合變換相關識別和光折變光學相關識別進行了研究，並給出了研究結果： （ 1 ）對聯合變換功率譜進行二值化處理可以使得功率譜高頻成份得到較大提高，從而大大提高聯合變換相關器的識別能力。 -
After processing, the cell parameter, transparency, optical damage threshold of ktp crystal have been measured as well as the distribution coefficient of doped elements. the results showed that, after dopping, the cell parameter and transparency of ktp crystal changed little ; optical damage threshold increased three orders of magnitude than the common flux ktp, meanwhile, optical homogeneity decresed a little
將ktp晶體加工后測試了它們的晶胞參數、透過率、光損傷閾值、摻雜元素分凝系數等，結果表明，經過摻雜的ktp晶體晶胞參數、透過率等基本沒有變化，光學均勻性稍有下降，而激光損傷閾值卻提高了3倍。
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