Aim:To analyze petroleum ether extracts of Xiaoxuming decoction and develop the methods for the quality control of the extract.Method:A method based on GC was developed.In qualitative analysis,samples were analyzed be...Aim:To analyze petroleum ether extracts of Xiaoxuming decoction and develop the methods for the quality control of the extract.Method:A method based on GC was developed.In qualitative analysis,samples were analyzed before and after derivation.In quantitative analysis,MS and FID detectors were used.Result:Cinnamic aldehyde was detected without derivation.And three kinds of fatty acids existing in almond oil were detected after derivation.Under the selected condition,cinnamic aldehyde was separated and detected.MS and FID detection generated the recoveries of 104.2% and 103.8% of cinnamic aldehyde with RSDs of 2.2% and 2.8%,respectively.Conclusion:This method is simple and reproducible,and it can be used for the quality control of petroleum ether extracts of Xiaoxuming decoction.展开更多
The molecular second-order nonlinear optical (NLO) properties and the powder second harmonic generation(SHG)of semicarbazide hydrochloride were studied.The molecular and crystal structure dependence of second-order no...The molecular second-order nonlinear optical (NLO) properties and the powder second harmonic generation(SHG)of semicarbazide hydrochloride were studied.The molecular and crystal structure dependence of second-order nonlinearity,transparency and thermal stability was discussed.It was also implied that semicarbazide hydrochloride as an ionic compound played important roles in designing effective second-order NLO materials.展开更多
A new kind of second order nonlinear optical(NLO) material m hydroxybenzoic acid(HBA) was reported in this paper. Primary study results revealed that it had a relatively strong nonlinearity, its powder SHG effect was ...A new kind of second order nonlinear optical(NLO) material m hydroxybenzoic acid(HBA) was reported in this paper. Primary study results revealed that it had a relatively strong nonlinearity, its powder SHG effect was 12 times that of KDP. The solid cut off wavelength λ cut off (350 nm) is very short compared to other organic second order NLO materials. The experimental results also showed that HBA had a high laser damage threshold and good characteristic thermal stability. Furthermore, We calculated its second order nonlinear hyperpolarizability β and analyzed the microscopic nonlinear properties, and found that the hydroxyl group could improve β obviously while the hydroxyl multisubstitution could hardly contribute to β values. [WT5HZ]展开更多
文摘Aim:To analyze petroleum ether extracts of Xiaoxuming decoction and develop the methods for the quality control of the extract.Method:A method based on GC was developed.In qualitative analysis,samples were analyzed before and after derivation.In quantitative analysis,MS and FID detectors were used.Result:Cinnamic aldehyde was detected without derivation.And three kinds of fatty acids existing in almond oil were detected after derivation.Under the selected condition,cinnamic aldehyde was separated and detected.MS and FID detection generated the recoveries of 104.2% and 103.8% of cinnamic aldehyde with RSDs of 2.2% and 2.8%,respectively.Conclusion:This method is simple and reproducible,and it can be used for the quality control of petroleum ether extracts of Xiaoxuming decoction.
文摘The molecular second-order nonlinear optical (NLO) properties and the powder second harmonic generation(SHG)of semicarbazide hydrochloride were studied.The molecular and crystal structure dependence of second-order nonlinearity,transparency and thermal stability was discussed.It was also implied that semicarbazide hydrochloride as an ionic compound played important roles in designing effective second-order NLO materials.
文摘A new kind of second order nonlinear optical(NLO) material m hydroxybenzoic acid(HBA) was reported in this paper. Primary study results revealed that it had a relatively strong nonlinearity, its powder SHG effect was 12 times that of KDP. The solid cut off wavelength λ cut off (350 nm) is very short compared to other organic second order NLO materials. The experimental results also showed that HBA had a high laser damage threshold and good characteristic thermal stability. Furthermore, We calculated its second order nonlinear hyperpolarizability β and analyzed the microscopic nonlinear properties, and found that the hydroxyl group could improve β obviously while the hydroxyl multisubstitution could hardly contribute to β values. [WT5HZ]
