The principal refractive indices and the thermal refractive index coefficients for Be3Al2Si6O18 crystal doped with 1.01wt% Cr2O3 have been accurately measured by the auto-collimation method at wavelengths of 0.488, 0....The principal refractive indices and the thermal refractive index coefficients for Be3Al2Si6O18 crystal doped with 1.01wt% Cr2O3 have been accurately measured by the auto-collimation method at wavelengths of 0.488, 0.53975, 1.064, 1.0795 and 1.3414 μm, and temperatures of 308.2, 328.6, 359.1 and 395.4 K respectively. Based on the measured results of principal indices of 0.488, 0.6328, 1.0795 and 1.3414μm, the Sellmeier’s equations and the thermal refractive index coefficients have been obtained, and the result has been proven to be accurate by error analysis.展开更多
通过对青藏高原中南部天门洞石笋TM-18b进行230Th测年和稳定同位素测试,建立了倒三冰消期249.89—240.32 ka BP的石笋碳氧同位素记录。结合已发表的、发育在同一洞穴石笋的年代和同位素数据,对倒三冰消期石笋生长记录和同位素序列进行分...通过对青藏高原中南部天门洞石笋TM-18b进行230Th测年和稳定同位素测试,建立了倒三冰消期249.89—240.32 ka BP的石笋碳氧同位素记录。结合已发表的、发育在同一洞穴石笋的年代和同位素数据,对倒三冰消期石笋生长记录和同位素序列进行分析,发现天门洞石笋TM-18b和19TM-3在倒三冰消期弱季风区间分别沉积28.5 mm和13.9 mm,持续时间约6.5 ka和5.2 ka,表明倒三冰消期弱季风区间青藏高原气候较为温暖湿润。南极冰芯记录的大气CO_(2)、CH_(4)浓度及δD的上升和δ^(18)O_(atm)的下降,以及全球海平面的上升支持倒三冰消期弱季风区间青藏高原气候的回暖。弱季风区间石笋δ^(18)O记录显示季风降水贡献减少,说明冰川融水和/或西风水汽可能为区域降水增多、气候变湿提供了大量水汽。展开更多
基金the National Natural Science Foundation of China (Grant No. 60278025).
文摘The principal refractive indices and the thermal refractive index coefficients for Be3Al2Si6O18 crystal doped with 1.01wt% Cr2O3 have been accurately measured by the auto-collimation method at wavelengths of 0.488, 0.53975, 1.064, 1.0795 and 1.3414 μm, and temperatures of 308.2, 328.6, 359.1 and 395.4 K respectively. Based on the measured results of principal indices of 0.488, 0.6328, 1.0795 and 1.3414μm, the Sellmeier’s equations and the thermal refractive index coefficients have been obtained, and the result has been proven to be accurate by error analysis.
