分布式反馈激光抽运铯磁力仪灵敏度相关参数研究

本文报道了分布式反馈(简称DFB)激光抽运铯磁力仪实验系统,研究并优化了激光光强、激光频率、射频强度、铯吸收泡温度、吸收泡缓冲气体压强等5类参数,测算得到不同情况下铯原子塞曼跃迁谱谱线宽度△f与信噪比S/N的比值,并利用公式δB=1γ/Cs△f/S/N(γCs为铯原子旋磁比)将其转化为磁力仪灵敏度,得到最优灵敏度为2.5 pT/Hz1/2.实验表明,本文所研究的5类参数都会不同程度提高磁力仪灵敏度,其中,激光频率、射频强度、铯吸收泡温度更是将灵敏度提高了10倍以上,这为更高性能、实用化半导体激光抽运铯磁力仪的研制提供了重要参考.     

Temperature and strain sensitivities of surface and hybrid acoustic wave Brillouin scattering in optical microfibers

Temperature and strain sensitivities of surface acoustic wave (SAW) and hybrid acoustic wave (HAW) Brillouin scattering (BS) in 1 μm-1.3 μm diameter optical microfibers are simulated. In contrast to stimulated Brillouin scattering (SBS) from bulk acoustic wave in standard optical fiber, SAW and HAW BS, due to SAWs and HAWs induced by the coupling of longitudinal and shear waves and propagating along the surface and core of microfiber respectively, facilitate innovative detection in optical microfibers sensing. The highest temperature and strain sensitivities of the hybrid acoustic modes (HAMs) are 1.082 MHz/℃ and 0.0289 MHz/με, respectively, which is suitable for microfiber sensing application of high temperature and strain resolutions. Meanwhile, the temperature and strain sensitivities of the SAMs are less affected by fiber diameter changes, ranging from 0.05 MHz/℃/μ to 0.25 MHz/℃/μ and 1×10^-4 MHz/με/μ to 5×10^-4 MHz/με/μ, respectively. It can be found that that SAW BS for temperature and strain sensing would put less stress on manufacturing constraints for optical microfibers. Besides, the simultaneous sensing of temperature and strain can be realized by SAW and HAW BS, with temperature and strain errors as low as 0.30 ℃-0.34 ℃ and 14.47 με-16.25 με.     

固相萃取-高效液相色谱-电喷雾串联质谱技术分析大鼠血浆中的氨基酸及其在电离辐射损伤动物模型中的应用

建立了基于高效液相色谱-电喷雾串联质谱(HPLC-ESI MS/MS)与固相萃取(SPE)相结合的大鼠血浆中氨基酸的分析方法。以硅胶基质的强阳离子交换固相萃取柱(SCX-SPE)提取血浆中的氨基酸和降低基质效应,HPLC-ESI MS/MS进行测定。对SPE处理的样品pH值进行了优化,发现pH 2.8时SCX-SPE提取氨基酸的回收率和重现性比较令人满意。除赖氨酸和鸟氨酸外,氨基酸的总体回收率在33.6%～107.7%之间;除精氨酸外,氨基酸标准曲线的线性相关系数r2＞0.99; 25种氨基酸测定的日内精密度和日间精密度较好,相对标准偏差(RSD)分别低于9.0%和19.1%。此外,将该分析方法用于电离辐射对大鼠血浆氨基酸代谢的影响研究。结果表明,辐射可导致血浆中氨基酸代谢紊乱,并且其紊乱程度与电离辐射损伤程度正相关。研究结果为筛选新的急性辐射损伤标记物研究提供了实验依据。     

偏蓝相干法聚氨酯合成革的制备工艺

本文研究了溶剂型聚氨酯在合成革中的展色性能,以4,4-二苯基甲烷二苯基甲烷二异氰酸酯、己二酸、乙二醇、1,4-丁二醇、甲基丙二醇、N,N-二甲基甲酰胺及乙酸乙酯为主要原料。考察了多元醇组成、扩链剂种类及溶剂组成等因素对干法聚氨酯合成革展色性影响规律。结果表明,当己二酸系聚酯二元醇中乙二醇与1,4-丁二醇的摩尔比为1∶1时、所用扩链剂组成为乙二醇与甲基丙二醇的摩尔比为1∶0.5,所使用的溶剂中N,N-二甲基甲酰胺与乙酸乙酯的质量比为2∶1时,制备得到的干法聚氨酯合成革的展色性能最佳(偏蓝相)。     

液晶衍射现象的实验研究

研究了液晶光学器件的衍射现象,实验表明,在一定的电压区间,出射光会出现周期性结构的衍射图样,探讨了这种衍射与液晶结构之间的关系以及各衍射光斑的偏振特性.