stretching pre 中文意思是什麼
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The main part and key technique of the cpa system is study : the generation of the femtosecond laser pulse is study, the modulation and maintenance of the ti : s laser is learned ; the types of the measurement for ultrashort laser pulse is generalized and the interferometric autocorrelation is expatiated ; the varieties of the stretchers is sum up and aberration - free stretcher is calculated and optimized to improve the stretching ratio ; the pulse selection is analyzed and a single pulse can be selected successful from the pulse train at a repetition rate of 82mhz ; the kinds of the amplifier in cpa system is gathered up, the eight - pass pre - amplifier and a good many effects in it is investigated. finally, the second, third and fourth - order dispersions in cpa system is analyzed systemicly, and the according means for dispersion compensation is worked out
對cpa系統的主要環節及關鍵技術進行了研究：掌握了鈦寶石激光器的調節和維護技術，較深入地研究了飛秒激光脈沖產生的機理，其中對群速色散、自相位調制、自鎖模等問題進行了詳盡的分析；總結了超短激光脈沖的測量技術，重點研究了干涉自相關測量法；在總結展寬器類型的基礎上，對無象差展寬器進行了理論計算、優化設計，提高了展寬倍數；深入論述了脈沖列的選單問題，熟練掌握了脈沖選單技術。 -
Machining deformation of aircraft monolithic component is simulated by finite element method ( fem ) and validated by experiment. the initial residual stress in pre - stretched plate is generated by simulating quenching and stretching processes. with a single tool - tooth milling process fem, the machining loads in monolithic component material removing is obtained. restart - calculation is put forward to complete the whole simulation of machining process. to verify the fem result, an experiment is carried out. the deformation distribution of the monolithic component resulting from fem shows a good agreement with the experiment result, which indicates that the key technologies presented in the paper are practicable and can be used to simulate the milling process of monolithic component to predict its deformation. lengthy and expensive trial and error experiment process can be avoided
在模擬淬火、拉伸過程獲得含有初始殘余應力的預拉伸板材以及模擬單齒切削過程獲得切削載荷的基礎上，提出並採用接力演算法，對一航空整體結構件的材料銑削過程進行有限元模擬，同時進行了試驗研究.結果表明，有限元模擬的整體結構件的變形與試驗具有一致性，從而證明提出的整體結構件加工模擬關鍵技術的可行性，避免了為研究加工變形而進行的繁瑣的試錯法 -
Now, i assume you ' ve done your pre - game stretching
現在我假定你已經做完了你的賽前熱身
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