氧化的苏木色精与抗坏血酸分光光度法测定纳克量级的钼

本文报导了氧化的苏木色精与抗坏血酸在沸水里加热,高度灵敏的测定钼的分光光度法,这种方法已用于测定地面水和尿中的钼,并获得了满意的结果。     

不同极性固定相上醇色谱保留指数的预测

采用拓扑指数(mQ)、定位基参数(SOX)及固定液极性值(CP)与脂肪醇在6种固定相上的气相色谱保留指数值(RI)进行了相关分析,发现RI与上述参数间存在良好的相关性,其关系可表示为:RI=158·384 57·7220Q-12·0491Q 5·720SOX 5·756CP R=0·9913继以留一法(Leave-one-out,LOO)进行交互检验,相关系数RCV=0·9909。说明所建定量结构-保留关系(QSRR)模型具有良好的稳定性和预测能力,较好地揭示了脂肪醇类物质在不同固定相上气相色谱保留指数的变化规律。     

Output Characteristics of High-Power Continuous Wave Raman Fiber Laser at 1484 nm Using Phosphosilicate Fiber

A continuous wave (CW) high-power Raman fiber laser (RFL) with maximum output power of 2.24 W and slope efficiency of 32.8% at 1484 nm is obtained using a CW 8.4 W/ 1064 nm Yb-doped double-clad fiber laser as a pump, 700 m phosphosilicate fiber, and cascaded cavities with two pairs of fiber Bragg grating mirrors for the first and the second Stokes orders. Theoretical simulation of the RFL using a very efficient and rapidly converging collocation method is done to understand and optimize the fiber length to obtain maximum second Stokes power. RFL performance for the 300, 700 and 1150 m phosphosilicate fiber lengths was experimentally investigated by observing maximum output power, slope efficiency, threshold power, and full-width at half maximum at the second Stokes wavelength.     

高功率端面抽运Nd:YVO4固体激光器模匹配的研究

研究了端面抽运Ｎｄ：ＹＶＯ４固体激光器激光晶体内基模半径与抽运光斑半径的匹配。晶体的Ｎｄ掺杂原子数分数分别为０．５％和２％,抽运功率分别为１０Ｗ和１４Ｗ。结果表明：ＴＥＭ００模输出功率对ｗ１／ｗｐａ在低于１的很大范围内的变化不敏感,不存在一个确定的最佳ｗ１／ｗｐａ值;在相对很小的ｗ１／ｗｐａ情形,仍可获得高效单一的ＴＥＭ００模输出,在这种情况下热透镜球差具有限模孔径的作用。     

邻硝基苯基荧光酮显色计算机求解超定方程组分光光度法同时测定镧、铈、镨、钕

研究在曲拉通X-100存在下,镧、铈、镨、钕与邻硝基苯基荧光酮显色反应的条件,测定配合物的最大吸收波长、摩尔吸光系数及配合比,建立了用计算机求解超定方程组分光光度法同时测定镧、铈、镨、钕的方法,编制的计算机程序用于稀土铝合金中四元素的同时测定。