排序方式: 共有33条查询结果,搜索用时 0 毫秒
1.
2.
3.
阐述了154dtex/36f锦纶6特种工业用丝生产过程中伸长率变异系数的降等情况,分析了原料分子量分布、纺丝工艺以及牵伸压辊压力等调整过程。实践证明采用单台聚合管用料,熔体温度为262±2℃,侧吹风风速为0.3s/min,丝室温度为30±2℃,且保持冷却条件的稳定均一,以及保证牵伸压辊压力均匀,可有效地控制了伸长率变异系数的范围。 相似文献
4.
6.
7.
8.
9.
Simultaneous determination of adenine, uridine and adenosine in cordyceps sinensis and its substitutes by LC/ESI-MS 总被引:1,自引:0,他引:1
A simple, sensitive and reproducible high performance liquid chromatography-mass spectrometry coupled with electrospray ionization method for simultaneous separation and determination of adenine, adenosine and uridine was developed. The analytical column is a 2.0 mm× 150 mm Shimadzu VP-ODS column and volume fraction of the mobile phase is 86.5 %water, 12.0%methanol and 1.5%formic acid. 2-chloroadenosine was used as internal standard. Selective ion monitoring mode and selective ion monitoring ions at ratio of mass to electric charge of 136 for adenine, 268 for adenosine and 267 for uridine were chosen for quantitative analysis of the three active components. The results show that the regression equations and linear range are Y=0. 062X 0. 005 and 2.0 - 140.0μg · mL 1for adenine, Y=0. 049X 0. 004 and 4. 0 - 115.0 μg · mL-1 for uridine, Y=0. 154X 0. 014 and 1.0 - 125.0 μg · mL 1 for adenosine. The limits of detection are 0.6 μg · mL 1 for adenine, 1.0μg · mL-1 for uri dine and 0.2 μg · mL 1 for adenosine.The recoveries of the three constituents are from 96.6% to 103.2%. 相似文献
10.