532 nm激光泵浦硝酸钡晶体产生外腔拉曼激光

由于硝酸钡晶体具有很强的对称振动（频率1047 cm^-1）和较高的拉曼增益,可以用来产生受激拉曼激光.采用单端泵浦的外置拉曼振荡腔与双棱镜分光装置进行了硝酸钡晶体拉曼激光实验,泵浦源为倍频Nd： YAG的532 nm激光,硝酸钡晶体通过水溶液降温法生长,尺寸为10 mm×10 mm×48 mm,采用特殊镀膜的腔镜对各阶斯托克斯光进行优化选择.在泵浦源达到65 mJ时,获得21 mJ一阶斯托克斯光,输出波长为563 nm,以及16 mJ的二阶斯托克斯光,输出波长为599 nm,受激拉曼散射SRS最大的整体

smoothing document language model with local word graph

ACM SIGIR; ACM SIGWEB

a requirement traceability refinement method based on relevance feedback

Knowledge Systems Institute Graduate School

语句句法成分边界和韵律特征知觉

The research investigates the acoustic-phonetic correlates of various levels of syntactic boundaries and the perception of prosody in Mandarin Chinese, more specifically, the way speakers express the syntatic relations between sentence compounents and teh perceptual representations of prosody. The relation between phonology and syntax in Chinese language is studied by comparing the perceptual representations and syntactic structures of sentences. The results may have theoretical and practical implications for research in fields of speech perception, linguistics and psycholinguistics, and for the development of speech engineering in China.