翻开19世纪初的北美洲地图，给人印象最深刻的既不是局限于密西西比河以东的美国，也不是偏处北方寒冷不毛之地的英属加拿大，而是庞大的“新西班牙副王辖区”（Virreinato de Nueva Espafia）。它东起佛罗里达半岛和古巴，西至太平洋...翻开19世纪初的北美洲地图，给人印象最深刻的既不是局限于密西西比河以东的美国，也不是偏处北方寒冷不毛之地的英属加拿大，而是庞大的“新西班牙副王辖区”（Virreinato de Nueva Espafia）。它东起佛罗里达半岛和古巴，西至太平洋海岸，南抵中美洲地峡，北至洛基山脉，还宣称对直至阿拉斯加的整个太平洋沿岸拥有主权。展开更多
Ⅰ. INTRODUCTION Although the absolute fluorescence quantum yield (QY) of a laser dye is an important parameter for both basic theory and application, its accurate determination is rather, complicated and difficult. T...Ⅰ. INTRODUCTION Although the absolute fluorescence quantum yield (QY) of a laser dye is an important parameter for both basic theory and application, its accurate determination is rather, complicated and difficult. The measured values reported are usually inconsistent with each other. The reason is that, in a dye solution, the competition of various processes of fluorescence quenching with the fluorescence emission makes the QY sensi-展开更多
文摘翻开19世纪初的北美洲地图，给人印象最深刻的既不是局限于密西西比河以东的美国，也不是偏处北方寒冷不毛之地的英属加拿大，而是庞大的“新西班牙副王辖区”（Virreinato de Nueva Espafia）。它东起佛罗里达半岛和古巴，西至太平洋海岸，南抵中美洲地峡，北至洛基山脉，还宣称对直至阿拉斯加的整个太平洋沿岸拥有主权。
文摘Ⅰ. INTRODUCTION Although the absolute fluorescence quantum yield (QY) of a laser dye is an important parameter for both basic theory and application, its accurate determination is rather, complicated and difficult. The measured values reported are usually inconsistent with each other. The reason is that, in a dye solution, the competition of various processes of fluorescence quenching with the fluorescence emission makes the QY sensi-
