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一、引言“西双版纳傣”这个族名,对大多数泰国人来说是比较熟悉的,虽说其中恐伯只有少数人进一步懂得:“西双版纳傣”是中华人民共和国境内一个讲着类似泰国语的民族,可要是提到“壮族”这名称,那么恐怕只有极少数人知道或者听说过。 相似文献
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Silica-based Yb 3+-doped glass is prepared by non-chemical vapor deposition.The drawn photonic crystal fiber(PCF) has a strong absorption at 976 nm and emission wavelength of approximately 1 037 nm.The intensity and spectral lineshape of the near infrared(NIR) luminescence of the Yb3+-doped PCF are recorded and discussed in terms of excitation power,excitation wavelength,fiber length,and Yb3+ ion concentration.The emission intensifies as the excitation power and Yb3+ ion concentration increase.The intensity of the shorter wavelength side of the luminescence spectrum decreases as the length of the PCF increases. 相似文献
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