Publications by authors named "Zhengmeng Liu"
This paper addresses the problem of direction-of-arrival (DOA) estimation of multiple wideband coherent chirp signals, and a new method is proposed. The new method is based on signal component analysis of the array output covariance, instead of the complicated time-frequency analysis used in previous literatures, and thus is more compact and effectively avoids possible signal energy loss during the hyper-processes. Moreover, the a priori information of signal number is no longer a necessity for DOA estimation in the new method.
View Article and Find Full Text PDF[Study on effect of different extracts in curcuma long on stability of curcumin].
Zhongguo Zhong Yao Za Zhi
May 2007
Article Synopsis
- The study aimed to explore how different extracts from Curcuma long can stabilize curcumin and prevent its degradation.
- Researchers used various solvents (like alcohol and acetone) to add to pure curcumin and analyzed its stability using high performance liquid chromatography (HPLC).
- The findings showed that alcohol extracts, especially 80% alcohol, significantly improved the stability of curcumin compared to its pure form.
Objective: To study the effects of lobster sauce and polysaccharide extracts on alpha-1,4-glucosidase activity by establishing on enzyme-inhibitor model.
Methods: Glucosidase activity was assayed at PH optima by PNPG substrate. Lobster sauce extracts were prepared by soaking, centrifagation.