巴戟天多糖的分离与纯化新方法

以巴戟天(Morinda officinalisHow)为原料,运用多种理化方法,提取纯化巴戟天粗多糖,经红外吸收光谱比较和鉴定确认提取物中有多糖特征吸收.采用苯酚—硫酸法测定多糖含量,以多糖的纯度和提取率为主要指标,对提取方法进行优化.结果表明,用乙醇-水提取法进行提取,用Sevag法除蛋白,氯化十六烷基吡啶(CPC)结合醇沉法进行纯化.正交实验结果表明提取纯化巴戟多糖最隹条件是乙醇浓度为85%,CPC浓度为0.4%,粗多糖浓度为10%的条件下,纯化多糖的纯度为89.7%,多糖的提取率为10.2%

信息反馈对城市居民节水态度行为的影响

本研究旨在探究节水技巧信息反馈和社会情绪对节水态度行为的影响。分为两个研究,无反馈方式下,节水技巧信息框架对节水态度行为的影响和有反馈方式下,节水技巧信息框架和社会情绪对节水态度行为的影响,每个研究包含两种信息框架作为不同反馈方式的实验设计,参与实验的被试共计335人。结论:(1)信息框架对节水态度行为的影响,体现在反馈方式有或无的实验对照中;(2)消极框架下被试节水态度行为的分数略高于积极框架下&nbsp;</p

Luminescent properties of Er~(3+)/Yb~(3+) co-doped oxyfluoride glass ceramic microsphere with the tapered fiber-microsphere coupling system

采用高温煅烧法制备了Er3+/yb3+共掺的氟氧玻璃陶瓷新材料(41.2SIO2-29.4Al2O3-17.6nA2CO3-11.8lAf3-0.5Erf3-2.5ybf3),并制作了透明带柄微球.提出了用锥光纤微球耦合系统研究Er3+/yb3+共掺的氟氧玻璃陶瓷材料发光特性的新方法.它具有所需激发光功率低、制备简便和便于测试的特点.用锥光纤作为耦合器将976 nM激光高效耦合入微球,并将产生的荧光和激光耦合出微球输到光谱分析仪,测量到了强的522,545和657 nM上转换荧光,也测到Er3+产生的1562 nM激光振荡光谱图.分析了Er3+/yb3+共掺氟氧玻璃陶瓷微球中Er3+上转换发光的机理、发光效率高的机理,分析了在氟氧玻璃陶瓷微球中产生激光振荡阈值比在SIO2基质微球中高的机理.We prepare Er3+/Yb3+co-doped oxyfluoride glass ceramic samples by high temperature calcination method(41.2SiO2-29.4Al2O3-17.6Na2CO3-11.8LaF3-0.5ErF3-2.5 YbF3), and also fabricate transparent microspheres each with a handle.We propose a new method of studying the luminescent properties of Er3+/Yb3+co-doped oxyfluoride glass ceramic with the tapered fiber-microsphere coupling system.The method has characteristics such as low excitation optical power, easy preparation and testing.We couple the 976 nm laser into the microspheres with the coupler of optical tapered fiber, then the fluorescence and laser are connected to spectrum analyzer with the optical tapered fiber.The strong up-conversion fluorescences at 522, 545 and 657 nm are obtained, and the laser oscillation spectra generated by Er3+ions at 1562 nm are also measured.The up-conversion luminescence mechanism of Er3+, the mechanism of high luminescence efficiency in Er3+/Yb3+co-doped oxyfluoride glass ceramic microsphere, and the mechanism of higher laser oscillation threshold in the oxyfluoride glass ceramic microsphere than in the SiO2matrix microsphere are all analyzed

Study on luminescent properties of Yb~(3+)-doped phosphosilicate microsphere

本文采用双锥光纤与微球腔耦合系统研究成分为55.93P2O5-3.57Al2O3-15nA2CO3-20SIO2的掺yb3+磷硅酸盐微球腔的合作上转换发光、下转换激光振荡及其级联拉曼激光振荡等发光特性.本实验采用中心波长为976 nM、线宽为0.15 nM的单纵模半导体激光作为抽运光源,在掺yb3+磷硅酸盐微球腔中测得中心波长为476.1 nM的蓝色合作上转换荧光,并运用合适的理论模型来解释该合作上转换产生11.9 nM蓝移效应的原因.同时,在1058.26 nM和1060.02—1126.08 nM处分别测得了由于微球腔谐振产生的下转换单纵模及多纵模激光振荡.另外,本文首次在同一微球腔中测得了由yb3+下转换激光激发产生的多级级联拉曼激光.在抽运功率为8.53 MW时,产生的级联拉曼激光可以达到两级,且波长延伸至1300 nM附近.Cooperative luminescence, down-conversion laser oscillation and cascaded Raman laser in Yb3+-doped 55.93P2O5-3.57Al2O3-15Na2CO3-20SiO2 phosphosilicate glass are studied in the biconical fiber-microsphere coupling system in this paper.A single-mode semiconducter laser with the center wavelength at 976 nm and line-width 0.15 nm is used as a pump source.The blue-shifted cooperative luminescence centered at 476.1 nm is obtained in the Yb3+-doped phosphosilicate microsphere.And a suitable model may be applied to explain the reason for the 11.9 nm blue-shift in this process.Meanwhile, the single-mode laser(at 1058.26 nm) and multimode laser oscillations(from 1060.02 to 1126.08 nm) have also been obtained as the result of resonant oscillation in microsphere cavity.In addition, for the first time so far as we know a self-stimulated cascaded Raman laser is observed in the same phosphosilicate microsphere, which is generated by the down-conversion laser of Yb3+.When the pump power is 8.53 mW, a two-order cascade Raman laser is generated,which extends the laser wavelength to near 1300 nm