負躍遷 的英文怎麼說
中文拼音 [fùyuèqiān]
負躍遷
英文
negative transition-
The former leads to couplings between all transitions with the same sign and to absorption reduction. the latter results in couplings, of which two terms have positive sign and with another two have negative sign
產生耦合的另一因素是激發態相干的自發轉移，它對其中兩個探測躍遷產生正號的耦合，對另兩個探測躍遷產生負號的耦合。The main works and results we have accomplished are as follows : 1 ) red - detuned locking of cooling / trapping laser to the cycling transition of cesium cooling has been accomplished by means of a double - passed acoustic - optical frequency shifting system and the technique of saturated absorption spectroscopy. the short - term residual frequency jitter is less than 350khz ; 2 ) automatic controlling system by computer programs has been established for laser cooling and trapping and cavity qed experiment. the laser and magnetic fields can be controlled by the acoustic - optical modulator and the electronic - controlled logic gate respectively
具體如下： 1 ）採用了往返兩次通過的聲光頻移系統結合飽和吸收光譜技術的實驗方案，實現了冷卻俘獲激光頻率相對于銫原子冷卻循環躍遷的負失諧鎖定，短期頻率穩定度約在350khz以內，並可方便地調節其負失諧量而無須對后續光路再作調整； 2 ）建立了一套基於計算機程序控制的、銫原子激光冷卻與俘獲實驗所需的時序控制系統。More and more attention were paid to the role of example in cognitive skill acquisition, to the mechanism of negative transfer in cognitive skill acquisition and the cognitive skip. the other way the basic process mechanisms of learning from worked example developed itself was the research on machine learning based on artificial intelligence. the research can be divided into four stages, with the time ranging from 1960 ' s to nowadays
到20世紀80年代後期，由於計算機技術的空前發展和在心理學研究中的廣泛運用，關于認知技能的研究越來越細化，研究越來越關注樣例在認知技能獲得中的作用、認知技能獲得中負遷移錯誤的機制、認知跳躍等現象；二是從人工智慧的角度研究機器學習，主要包括四個階段：第一階段是20世紀60年代。
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