排序方式: 共有17条查询结果,搜索用时 0 毫秒
1.
光泵THz激光器进展及其应用前景 总被引:1,自引:0,他引:1
阐述了太赫兹辐射产生的各种方法及其特点,分析了国内外光泵太赫兹激光器的发展及研究现状,指出在实际应用中光泵太赫兹激光器具有效率高、覆盖频率宽、输出功率高等优点,是目前可实用化的THz激光辐射源.另外,还介绍了光泵太赫兹激光器在成像、探测、医疗诊断等领域的实际应用及其广阔的前景. 相似文献
2.
A high-current pulsed electron beam(HCPEB) generated on the system of Nadezhda-2 was applied to improve the microstructure and performance of 0.20% C low carbon steel. Surface layers of the samples bombarded by explosive electron beam at different pulses was observed by using electron microscopy. The physical model of the thermal-stress process and related modification mechanism as a result of HCPEB irradiation was also investigated. After HCPEB post treatments, obvious changes in microstructure and significant hardening occur in the depth of 200-250 μm from the surface after HCPEB irradiation. Rapid heating and subsequent rapid solidification induce heavy plastic deformation, which results in that the laminated structure of pearlite is substituted by dispersive rounded-like cementites in the near-surface. The effect of HCPEB treatment can reach more than 500 m depth from the surface. The original crystalline structure is changed to a different degree that grows with the numbers of bombardment, and in the surface layer amorphous states and nanocrystaline structures consisting of grains of γ-phase and cementite are found. The violent stress induced by HCPEB irradiation is the origin of the nanostructured and amorphous structure formation. 相似文献
3.
4.
5.
6.
7.
以表面增强喇曼散射做为实验手段,提出了研究固体表面化学吸附动力学的理论模型和实验方法。计算了对氨基苯甲酸在银表面的化学吸附动力学参数;多相因子,吸附以及脱附速率常数Ka和Ka,发现对氨基苯甲酸的吸附是多相的(m≈0.4),讨论了描述化学吸附时多相往性概念的的意义。结合SERS光谱分析结果,我们认为PABA化学吸附的多相性表示吸附分子在表面上存在不止一种吸附形式。 相似文献
8.
9.
10.