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RISS 인기검색어
- 검색키워드
- 저자 : Minglei Li (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
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Effect of Mobile Phase Additives on the Resolution of Four Bioactive Compounds by RP-HPLC
Li, Shengnan,Tian, Minglei,Row, Kyung Ho Molecular Diversity Preservation International (MD 2010 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.11 No.5
<P>The use of mobile phase additives enhances the separation and resolution of the bioactive compounds on the C<SUB>18</SUB> column. Chlorogenic acid, caffeic acid, rutin, and scoparone from <I>Herba Artemisiae Scopariae</I> were investigated as the target compounds. Acetic acid, triethylamine, inorganic salts, and several ionic liquids were added as mobile phase additives into methanol/water (40:60, v/v). The result revealed that a mobile phase with 0.01 mol/L of ionic liquid [BMIM][BF<SUB>4</SUB>] enabled the optimum separation of the four target compounds.</P>
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Minglei Tian,노경호,Shengnan Li 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.2
Two kinds of ionic liquid, 1-Hexyl-3-methylimidazolium tetrafluoroborate ([Hmim][BF_4]) and 1-Methyl-3-octylimidazolium tetrafluoroborate ([Omim][BF_4]), were used as additives in the linear solvation energy relationships (LSERs) model to investigate the fundamental chemical interactions governing the retention of nine aromatic compounds in acetonitrile/water mobile phases on a C18 column. The effects of the [Hmim][BF_4] and [Omim][BF_4] were compared and the ability of the LSERs to account for the chemical interactions underlying solute retention was shown. A comparison of predicted and experimental retention factors suggests that LSER formalism is able to reproduce adequately the experimental retention factors of the solutes studied in the different experimental conditions investigated.
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Molecularly Imprinted Polymer for Solid‐Phase Extraction of Ecteinascidin 743 from Sea Squirt
Tian, Minglei,Li, Shengnan,Row, Kyungho WILEY‐VCH Verlag 2012 Chinese journal of chemistry Vol.30 No.1
<P><B>Abstract</B></P><P>Ecteinascidin 743 from sea squirt is one of the most original anti‐tumoral activity compounds, as proven by the Natural Cancer Institute. Ecteinascidin 743 could be obtained with traditional liquid extraction, but it should be purified and separated from the extract. A molecularly imprinted solid‐phase extraction procedure was developed for the selective separation. Ecteinascidin 743 was used as the template and the polymer was synthesized in a methanol environment. Water and <I>n</I>‐hexane as the washing solvents can eliminate most of the interference. Good linearity and low relative standard deviations (less than 4.39%) justify its continuing development.</P>
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FPGA-Based Real-Time System for Demodulating FBG Wavelength
Peng Wang,Minglei Shao,Xu Han,Shanshan Li 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.6
In order to detect the wavelength drift of FBG (fiber Bragg grating) sensors, the real-time demodulating system based on tunable F-P filter (TFPF) was built. The optical parts of the demodulation system include broadband optical source, TFPF unit, reference grating model, sensing grating array, and couplers. The electronic parts of the demodulation system consist of AD converting unit, DA converting unit, field programmable gate array (FPGA) unit and human-computer interaction unit. With the high-speed data processing capacity, FPGA was utilized to realize digital logic circuits of the demodulation system. It includes resetting unit, phase locked loop (PLL) unit, driving TFPF unit, detecting keys unit, LCD displaying unit, FIR filtering unit and data calculating unit. The demodulating system has such features as high reliability and speed, instantaneity, and programmability. It can satisfy the requirements of wavelength demodulation of FBG sensors in practical engineering.
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A Low-Cost Portable Real-Time EEG Signal Acquisition System Based on DSP
Peng Wang,Shanshan Li,Minglei Shao,Chao Liang 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.2
EEG apparatus are expensive and bulky. Their real-time performance is weak, and EEG signals are easy to be distorted. In this paper, a low-cost portable EEG signal acquisition system based on DSP is developed. By a noninvasive method with bipolar leads, weak EEG signals are induced to the pre-processing circuits, where they will undergo multi-level amplifying and filtering. Then, the analog signals are converted into digital signals using ADS8320. These digitized signals are filtered in DSP (TMS320VC5509) so that the power interference and physiological artifacts are removed with LMS (Last Mean Square) algorithm and ICA (Independent Component Analysis) algorithm. Experimental results demonstrate that the system can acquire weak EEG signals in real time, display and save the processing results. The acquisition system has the advantages of usableness and portability, and helpful to the popularity of community-based and family-based EEG diagnostic equipments.
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Xing Xu,Xinwei Jiang,Ju Xie,Feng Wang,Minglei Li 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.4
The trajectory planning plays an important role in realizing the autonomous driving process. The trajectory that reflects the driving habits of human drivers and conforms with people’s driving intuition enables a vehicle to operate smoother and more comfortable when passing through corners, which could improve the acceptability of autonomous vehicles in the market in the future. The research of this paper focuses on planning a human driving characterised trajectory along a road based on the test track that could reflect natural driving behaviour in corners considering the sense of natural and comfortable for the occupants. Firstly, the data collected of the test track are processed and the coordinate system transformation is completed, and the human tested trajectories in the test track is extracted and analysed. Then, the human driving characterised trajectory planning is completed based on optimal control in a lane section on the test track. The trajectory tracking control algorithm based on LQR is designed, and a CarSim/Simulink co-simulation platform is established to track the optimal trajectory generated in a lane and the lane centreline trajectory to verify the superiority of the planned trajectory. The results show that compared with the centreline trajectory, the human driving characterised trajectory planned enables the autonomous vehicle operates smoother and more comfortable, and reflects the characteristic of human drivers to a large extent.
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