排序方式: 共有11条查询结果,搜索用时 555 毫秒
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GaAs表面钝化的新方法:S_2Cl_2处理 总被引:1,自引:1,他引:0
本文用光致发光谱(PL)结合俄欧电子能谱(AES)和X射线光电子能谱(XPS),首次研究了S2Cl2钝化的GaAs(100)表面.结果表明,PL强度较钝化前样品提高了将近两个数量级.钝化后的表面AES谱显示含有S,Ga,AS,C和少量Cl原子而不含O原子.XPS谱说明S原子和Ga、As原子都成键.与(NH4)2S处理的比较结果显示,几秒钟的.S2Cl2处理即可达到或超过几十分钟(NH4)2S处理的钝化效果. 相似文献
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Induced transparency phenomena and strong dispersion can be produced in a coupled resonator induced transparency(CRIT) structure.In this paper,we investigate the influences of structure parameters,such as amplitude reflection coefficient and loss,on transmission spectrum and dispersion of CRIT structure,and further study the control of dispersion in the structure.The results show that in the CRIT structure,adjusting the loss of resonators is an effective method of controlling dispersion and producing simultaneous normal and abnormal dispersion.When we choose approximate amplitude reflection coefficients of the two couplers,the decrease of transmittance due to loss could be effectively made up.In the experiment,we achieve the control of dispersion and simultaneous strong normal and abnormal dispersion in the CRIT structure comprised of fiber.The results indicate the CRIT structure has potential applications in optical signal processing and optical communication. 相似文献
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The multi-source pion interferometry in relativistic heavy-ion collisions is presented and two-source models for hadron gas and hadron gas plus quark-gluon plasma are proposed. The models can resolve the HBT puzzle. For the same $q$ and different direction of \bar{q}, the two-pion correlation functions show characteristic oscillation behaviors, which may be used to distinguish the two-source models. Our research also showes that the multi-source pion correlations can resolve the HBT puzzle. 相似文献
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在实验室建设中进行大学物理实验课程体系的改革与建设 总被引:4,自引:0,他引:4
本对大学物理实验课程体系存在的一些问题进行了探讨,并提出了改革与建设的方法。 相似文献
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生物组织吸收微波辐照的影响因素及微波辐照效率是临床上进行体外辐照治疗时需要考虑的重要问题之一。以猪肉样本块为研究对象,用频率为2450 MHz 的微波,通过控制辐照的3 个变量(时间、功率、距离),分别探测了表层、透热最深层的温度和微观组织形貌变化。实验结果表明:增大辐照功率提升上表面温度效果最明显;根据不同深度位置的温度变化曲线,当上表面达到一定温度后才产生透热深度;从理论上解释了由于极化和弛豫现象而使上表面温度影响透热深度的原因,并由热传导方程的推导公式,验证了控制辐照影响上表面温度能够间接影响透热深度的实验结果,为微波辐照热疗中温度控制的进一步研究提供基础。 相似文献
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